An LED driver configured to control a LED fixture comprising a plurality of LED groups is described, each LED group comprising at least one LED forming a series connection with a switch, wherein the plurality of LED groups are arranged in a parallel connection, the LED fixture further comprising a capacitor arranged in a parallel connection to the plurality of LED groups, the LED driver comprising:
a power converter for converting an input power from a power source to a current which is provided to the plurality of LED groups;
a control unit configured to control the power converter to provide the current to the plurality of LED groups, and wherein the control unit is further configured to
control an operation mode of the switch of the LED group between a nominal mode, wherein the switch operates in a closed nominal state or an open nominal state, and
a transition mode, wherein the switch operates in a semi-closed state, wherein a gate to source voltage of the switch of the LED group is lower than the gate to source voltage of the respective switch when operated in the nominal mode,
switch the current from flowing through a first LED group to flowing through a second LED group, wherein the first LED group has a higher forward voltage than the second LED group, by switching the switch of the first LED group in the open nominal state and the switch of the second LED group in the semi-closed state during a transient period.
Method of controlling an LED fixture comprising a plurality of LEDs, the plurality of LED comprising at least four LEDs, configured to emit light of different colors, the method comprising:
receiving a set point representing a desired color and intensity for the light to be generated by the LED fixture;
determining, based on available color characteristics of the plurality of LEDs, at least two different subsets of the plurality of LEDs and a set of intensity set points for each of the at least two different subsets, wherein each set of intensity set points results in obtaining or approximating the desired color and intensity by the LED fixture;
selecting the subsets of the plurality of LEDs with the corresponding sets of intensity set points which meet a predetermined criterion;
use a selected subset to drive the plurality of LEDs with the corresponding set of intensity set points.
H05B 45/48 - Details of LED load circuits with an active control inside an LED matrix having LEDs organised in strings and incorporating parallel shunting devices
providing a duty cycle signal, representing the duty cycle of the switch as determined during the measurement window, to the switch of the power converter to control an operation of the switch.
LED driver configured to control a LED fixture comprising a plurality of LEDs, a power converter configured to convert an input power to a load power, the power converter comprising a PFC circuit configured to convert the input power to a bus voltage provided to a DC voltage bus, a converter arranged downstream the DC voltage bus, a control unit configured to control the power converter, and wherein the control unit is configured to, when the LED driver is in a standby mode, determine the bus voltage, and to control the PFC circuit by switching off the PFC circuit when the determined bus voltage is higher than or equal to a high bus voltage limit, and switching on the PFC circuit when the determined bus voltage is lower than or equal to a low bus voltage limit.
Power supply for powering a load, the power supply comprising an input terminal configured to be connected to an external power supply having a mains voltage, an output terminal configured to be connected to the load, a power converter configured to convert a supply power, received from the external power supply, to a load power for powering the load, a measurement circuit configured to provide a signal representative of the mains voltage, a control unit configured to determine a voltage and a current on a load side of the power converter, and receive the signal from the measurement circuit and to determine the mains voltage based on the signal, and determine the load power supplied on the load side of the power converter, determine a loss power representing the power loss from the external power supply to the load side of the power converter, and determine the supply power.
Disclosed is an auxiliary battery circuit for an LED driver for driving at least one LED group. The LED driver is adapted to be powered by a main energy source. The auxiliary battery circuit comprises: a battery, a conversion circuit adapted to be connected to the LED driver and to the battery. The conversion circuit has: a first mode wherein the battery is adapted to receive energy from the LED driver, and a second mode wherein the battery is adapted to provide energy to the LED driver. A control unit of the auxiliary battery circuit is adapted to detect when the main energy source is in a failure mode, and control the conversion circuit. The control unit is adapted to arrange the conversion circuit in the second mode when the main energy source is in the failure mode.
H02J 9/06 - Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over
H05B 45/375 - Switched mode power supply [SMPS] using buck topology
H05B 45/38 - Switched mode power supply [SMPS] using boost topology
9.
OPERATING MOSFET IN LINEAR MODE FOR MULTI-GROUP LEDS
An LED driver configured to control a LED fixture comprising a plurality of LED groups is described, each LED group comprising at least one LED forming a series connection with a switch, wherein the plurality of LED groups are arranged in a parallel connection, the LED fixture further comprising a capacitor arranged in a parallel connection to the plurality of LED groups, the LED driver comprising: · a power converter for converting an input power from a power source to a current which is provided to the plurality of LED groups; · a control unit configured to control the power converter to provide the current to the plurality of LED groups, and wherein the control unit is further configured to o control an operation mode of the switch of the LED group between a nominal mode, wherein the switch operates in a closed nominal state or an open nominal state, and a transition mode, wherein the switch operates in a semi-closed state, wherein a gate to source voltage of the switch of the LED group is lower than the gate to source voltage of the respective switch when operated in the nominal mode, switch the current from flowing through a first LED group to flowing through a second LED group, wherein the first LED group has a higher forward voltage than the second LED group, by switching the switch of the first LED group in the open nominal state and the switch of the second LED group in the semi-closed state during a transient period.
A method of wireless configuring an LED driver is described. The LED driver comprises a power converter for powering an LED fixture, a BLE transceiver and an on-board power supply for powering the BLE transceiver, and a control unit for controlling the power converter and/or the LED fixture. The method comprising the steps of: transmitting a configuration signal representative of configuration data for the LED driver from an user interface to the BLE transceiver of the LED driver, generating configuration data for the LED driver based on the configuration signal, and configuring the LED driver according to the configuration data.
H05B 47/19 - Controlling the light source by remote control via wireless transmission
H04W 4/80 - Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
11.
AN LED DRIVER FOR POWERING AN LED FIXTURE, IN PARTICULAR AN LED DRIVER COMPRISING A FLYBACK CONVERTER
An LED driver for powering an LED fixture is described, the LED driver comprising: - an input terminal configured to receive a rectified AC voltage; - a flyback converter having: · a primary winding coupled to the input terminal; · a switch coupled to the primary winding and configured to control a current of the primary winding based on a drive signal; · a secondary winding configured to provide a supply voltage Vsup for powering the LED fixture; - a feedback circuit configured to generate a feedback signal, the feedback circuit being configured to: · receive a first signal representing the supply voltage as provided by the secondary winding; · receive a second signal representing the rectified AC voltage; · process the second signal to obtain a processed signal representing a time-derivative of an inversion of the second signal; · determine the feedback signal by combining the first signal and the processed signal; · outputting the feedback signal. - a control unit configured to receive the feedback signal and determine the drive signal for controlling the switch based on the feedback signal.
An LED driver measures a voltage across the LED and a temperature associated with the LED. The LED driver drives the LED to operate below a knee in the voltage/current curve of the LED and derives an expected voltage across the LED from the temperature of the LED, the LED driving current, and a predetermined relation between the expected LED voltage and at least one of LED temperature and LED driving current. The LED driver determines if the measured voltage across the LED exceeds the expected voltage across the LED, and establishes, based on the determination, if an LED approaching end of life warning is to be generated. Thus, an approaching end of life may be determined by the LED driver while the LED is still operational.
H05B 45/58 - Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDsCircuit arrangements for operating light-emitting diodes [LED] responsive to LED lifeProtective circuits involving end of life detection of LEDs
H05B 45/56 - Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDsCircuit arrangements for operating light-emitting diodes [LED] responsive to LED lifeProtective circuits involving measures to prevent abnormal temperature of the LEDs
A modular system includes an LED driver and an LED light engine. The driver includes a switched mode power converter and a first control unit to control a switch of the converter, thereby controlling the supply current to an LED assembly of the light engine. The assembly includes LEDs and one or more switches arranged in series or in parallel with one or more of the LEDs. The light engine also includes a second control unit controlling the one or more switches of the LED assembly so as to control current through the LEDs. The first control unit controls amplitude of the supply current. The second control unit controls duty cycle of the LED current through the LEDs. The first and second control units are configured to synchronize a switching operation of the switched mode power converter with a switching operation of the switches of the light engine.
H05B 45/48 - Details of LED load circuits with an active control inside an LED matrix having LEDs organised in strings and incorporating parallel shunting devices
F21S 2/00 - Systems of lighting devices, not provided for in main groups or , e.g. of modular construction
H05B 45/10 - Controlling the intensity of the light
Method of controlling an LED fixture comprising a plurality of LEDs, the plurality of LED comprising at least four LEDs, configured to emit light of different colors, the method comprising: - receiving a set point representing a desired color and intensity for the light to be generated by the LED fixture; - determining, based on available color characteristics of the plurality of LEDs, at least two different subsets of the plurality of LEDs and a set of intensity set points for each of the at least two different subsets, wherein each set of intensity set points results in obtaining or approximating the desired color and intensity by the LED fixture; - selecting the subsets of the plurality of LEDs with the corresponding sets of intensity set points which meet a predetermined criterion; - use a selected subset to drive the plurality of LEDs with the corresponding set of intensity set points.
H05B 45/375 - Switched mode power supply [SMPS] using buck topology
H05B 45/46 - Details of LED load circuits with an active control inside an LED matrix having LEDs disposed in parallel lines
H05B 45/48 - Details of LED load circuits with an active control inside an LED matrix having LEDs organised in strings and incorporating parallel shunting devices
A method for starting up an illuminating process of a plurality of series connected LEDs by means of a LED driver is described, whereby a maximum allowed voltage output of the LED driver is lower than a forward voltage of the plurality of series connected LEDs in a cold state.
f) stepping up of the first current to a second current provided by the LED driver to the plurality of series connected LEDs.
H05B 45/385 - Switched mode power supply [SMPS] using flyback topology
H05B 45/34 - Voltage stabilisationMaintaining constant voltage
H05B 45/54 - Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDsCircuit arrangements for operating light-emitting diodes [LED] responsive to LED lifeProtective circuits in a series array of LEDs
16.
METHOD OF MULTI-MODE COLOR CONTROL BY AN LED DRIVER
Method of controlling an LED fixture comprising a plurality of LEDs, the plurality of LED comprising at least four LEDs, configured to emit light of different colors, the method comprising: - receiving a set point representing a desired color and intensity for the light to be generated by the LED fixture; - determining, based on available color characteristics of the plurality of LEDs, at least two different subsets of the plurality of LEDs and a set of intensity set points for each of the at least two different subsets, wherein each set of intensity set points results in obtaining or approximating the desired color and intensity by the LED fixture; - selecting the subsets of the plurality of LEDs with the corresponding sets of intensity set points which meet a predetermined criterion; - use a selected subset to drive the plurality of LEDs with the corresponding set of intensity set points.
H05B 45/375 - Switched mode power supply [SMPS] using buck topology
H05B 45/46 - Details of LED load circuits with an active control inside an LED matrix having LEDs disposed in parallel lines
H05B 45/48 - Details of LED load circuits with an active control inside an LED matrix having LEDs organised in strings and incorporating parallel shunting devices
A visual light communication (VLC) method for a lighting system comprising an LED driver and a plurality of LEDs or LED groups includes the steps of: receiving a set-point representing a desired illumination characteristic, comprising an intensity set-point, a color set-point or a combination thereof, and data that is to be transmitted using VLC; determining a current profile for each LED or LED group of the plurality of LEDs or LED groups based on the desired illumination characteristic represented by the set-point, whereby an envelope of a combined current profile is modulated for a corresponding intensity variation as perceived by a sensor to represent a variable length VLC code comprising one or more code words; and generating one or more control signals to drive the plurality of LEDs or LED groups in accordance with the current profiles for the plurality of LEDs or LED groups to transmit the VLC code.
if the control terminal of the LED light engine is not a communication terminal, determining an impedance value observed at the control terminal of the LED light engine and performing an initialisation of the LED driver based on the impedance value.
A multi-channel LED driver for driving an LED fixture, wherein the multi-channel LED driver comprising a plurality of output channels, wherein each output channel is connectable to an LED or LED string of the LED fixture, the multi-channel LED driver comprising: - a plurality of power converters, each power converter being associated with an output channel of the plurality of output channels, wherein each power converter comprises a switch, and wherein each power converter converts an input power at an input terminal to a current at a respective output channel of the multi-channel LED driver, - a comparator configured to compare a current signal representing the current measured at an output channel by a current measurement element with a reference signal representing a current set point for the output channel, and wherein the comparator generates an output signal to control the switch of the power converter associated with the output channel, - a controller arranged to determine successive, for each of the plurality of power converters associated with the plurality of output channels, a duty cycle of the respective switch of the power converter during a measurement window and wherein the controller is further arranged to control the switch of the power converter outside the measurement window by: - disabling the comparator to control the switch and - providing a duty cycle signal, representing the duty cycle of the switch as determined during the measurement window, to the switch of the power converter to control an operation of the switch.
A multi-channel LED driver for driving an LED fixture, wherein the multi-channel LED driver comprising a plurality of output channels, wherein each output channel is connectable to an LED or LED string of the LED fixture, the multi-channel LED driver comprising: - a plurality of power converters, each power converter being associated with an output channel of the plurality of output channels, wherein each power converter comprises a switch, and wherein each power converter converts an input power at an input terminal to a current at a respective output channel of the multi-channel LED driver, - a comparator configured to compare a current signal representing the current measured at an output channel by a current measurement element with a reference signal representing a current set point for the output channel, and wherein the comparator generates an output signal to control the switch of the power converter associated with the output channel, - a controller arranged to determine successive, for each of the plurality of power converters associated with the plurality of output channels, a duty cycle of the respective switch of the power converter during a measurement window and wherein the controller is further arranged to control the switch of the power converter outside the measurement window by: - disabling the comparator to control the switch and - providing a duty cycle signal, representing the duty cycle of the switch as determined during the measurement window, to the switch of the power converter to control an operation of the switch.
The present invention pertains to a system and method for operating at least one LED unit of lighting grid comprising a plurality of LED units, wherein the LED units are configured to transmit a VLC signal including a code word. A plurality of user equipment devices captures the light transmitted by the LED unit and determines parameters related to the light, such as a VLC quality parameter, flicker value, light intensity parameter and light colour parameter. Based on these parameters, a controller determines control parameters for the LED unit. As such, a feedback loop is created wherein the LED unit is controlled based on measurements with the user equipment devices.
H04B 10/00 - Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
A control circuit and method are provided for a controlled start-up of N LED groups. The control circuit comprising a LED switching element and a chargeable element in parallel with each LED group, and a low-power source. The method comprising a step of prior to supplying power to the LED groups, setting the LED switching elements in a second state corresponding with the LED group being off. Alternatively, a lower chargeable element is connected via a diode with the top of a higher chargeable element. The control circuit may further comprise a switch having a lighting mode wherein current flows through the LED groups or the corresponding LED switching elements, and a charging mode wherein current flows to the chargeable elements, thereby charging the chargeable elements.
H05B 45/48 - Details of LED load circuits with an active control inside an LED matrix having LEDs organised in strings and incorporating parallel shunting devices
Auxiliary battery circuit for an LED driver for driving at least one LED group, wherein the LED driver is adapted to be powered by a main energy source, the auxiliary battery circuit comprising: a battery, a conversion circuit adapted to be connected to the LED driver and to the battery, wherein the conversion circuit has: a first mode wherein the battery is adapted to receive energy from the LED driver, and a second mode wherein the battery is adapted to provide energy to the LED driver, and a control unit adapted to detect when the main energy source is in a failure mode, and control the conversion circuit, wherein the control unit is adapted to arrange the conversion circuit in the second mode when the main energy source is in the failure mode.
Auxiliary battery circuit for an LED driver for driving at least one LED group, wherein the LED driver is adapted to be powered by a main energy source, the auxiliary battery circuit comprising: a battery, a conversion circuit adapted to be connected to the LED driver and to the battery, wherein the conversion circuit has: a first mode wherein the battery is adapted to receive energy from the LED driver, and a second mode wherein the battery is adapted to provide energy to the LED driver, and a control unit adapted to detect when the main energy source is in a failure mode, and control the conversion circuit, wherein the control unit is adapted to arrange the conversion circuit in the second mode when the main energy source is in the failure mode.
A method of wireless configuring an LED driver is described, the LED driver comprising a power converter for powering an LED fixture, a BLE transceiver and an on-board power supply for powering the BLE transceiver, and a control unit for controlling the power converter and/or the LED fixture, the method comprising the steps of: - transmitting a configuration signal representative of configuration data for the LED driver from an user interface to the BLE transceiver of the LED driver; - generating configuration data for the LED driver based on the configuration signal; - configuring the LED driver according to the configuration data.
A method of wireless configuring an LED driver is described, the LED driver comprising a power converter for powering an LED fixture, a BLE transceiver and an on-board power supply for powering the BLE transceiver, and a control unit for controlling the power converter and/or the LED fixture, the method comprising the steps of: - transmitting a configuration signal representative of configuration data for the LED driver from an user interface to the BLE transceiver of the LED driver; - generating configuration data for the LED driver based on the configuration signal; - configuring the LED driver according to the configuration data.
Disclosed is a method of capturing an image of a scene using a user device having a rolling shutter camera. The scene is subjected to an illumination by an LED light source. The method includes providing, by the user device, a notification signal to the LED light source, the notification signal being indicative of a capturing or imminent capturing of an image; adjusting, by the LED light source, an operating characteristic of the LED light source, based on the notification signal; and capturing, by the rolling shutter camera, the image of the scene, while the LED light source is operating at the adjusted operating characteristic.
An LED driver measures a voltage across the LED and a temperature associated with the LED. The LED driver drives the LED to operate below a knee in the voltage/current curve of the LED and derives an expected voltage across the LED from the temperature of the LED, the LED driving current, and a predetermined relation between the expected LED voltage and at least one of LED temperature and LED driving current. The LED driver determines if the measured voltage across the LED exceeds the expected voltage across the LED, and establishes, based on the determination, if an LED approaching end of life warning is to be generated. Thus, an approaching end of life may be determined by the LED driver while the LED is still operational.
H05B 45/56 - Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDsCircuit arrangements for operating light-emitting diodes [LED] responsive to LED lifeProtective circuits involving measures to prevent abnormal temperature of the LEDs
H05B 45/58 - Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDsCircuit arrangements for operating light-emitting diodes [LED] responsive to LED lifeProtective circuits involving end of life detection of LEDs
An LED driver measures a voltage across the LED and a temperature associated with the LED. The LED driver drives the LED to operate below a knee in the voltage/current curve of the LED and derives an expected voltage across the LED from the temperature of the LED, the LED driving current, and a predetermined relation between the expected LED voltage and at least one of LED temperature and LED driving current. The LED driver determines if the measured voltage across the LED exceeds the expected voltage across the LED, and establishes, based on the determination, if an LED approaching end of life warning is to be generated. Thus, an approaching end of life may be determined by the LED driver while the LED is still operational.
H05B 45/58 - Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDsCircuit arrangements for operating light-emitting diodes [LED] responsive to LED lifeProtective circuits involving end of life detection of LEDs
H05B 45/56 - Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDsCircuit arrangements for operating light-emitting diodes [LED] responsive to LED lifeProtective circuits involving measures to prevent abnormal temperature of the LEDs
30.
Method of controlling an LED source and an LED based light source
H02M 3/158 - Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
H05B 45/375 - Switched mode power supply [SMPS] using buck topology
H05B 45/38 - Switched mode power supply [SMPS] using boost topology
Disclosed is a power supply. In an example, the power supply comprises a switched mode power converter. The switched mode power converter comprises an input terminal for receiving an input voltage, and an output terminal for supplying a power to a load. A control unit of the power supply controls a switch of the switched mode power converter. A current-limited power supply powers the control unit, and is connected to the input voltage, whereby the control unit is configured to control an input current to the switched mode power converter.
A method of initializing an LED driver to power an LED light engine comprising one or more LEDs is disclosed, the method comprising: - connecting a control terminal of the LED driver to a control terminal of the LED light engine; - determining whether the control terminal of the LED light engine is a communication terminal by outputting a communication signal from the control terminal of the LED driver to the control terminal of the LED light engine; - establishing that the control terminal of the LED light engine is a communication terminal if a reply communication signal to the communication signal is received within a predetermined period; - if the control terminal of the LED light engine is a communication terminal, perform an initialisation of the LED driver by exchanging configuration data between the LED driver and the LED light engine; - if the control terminal of the LED light engine is not a communication terminal, determining an impedance value observed at the control terminal of the LED light engine and performing an initialisation of the LED driver based on the impedance value.
A method of initializing an LED driver to power an LED light engine comprising one or more LEDs is disclosed, the method comprising: - connecting a control terminal of the LED driver to a control terminal of the LED light engine; - determining whether the control terminal of the LED light engine is a communication terminal by outputting a communication signal from the control terminal of the LED driver to the control terminal of the LED light engine; - establishing that the control terminal of the LED light engine is a communication terminal if a reply communication signal to the communication signal is received within a predetermined period; - if the control terminal of the LED light engine is a communication terminal, perform an initialisation of the LED driver by exchanging configuration data between the LED driver and the LED light engine; - if the control terminal of the LED light engine is not a communication terminal, determining an impedance value observed at the control terminal of the LED light engine and performing an initialisation of the LED driver based on the impedance value.
A method for starting up an illuminating process of a plurality of series connected LEDs by means of a LED driver is described, whereby a maximum allowed voltage output of the LED driver is lower than a forward voltage of the plurality of series connected LEDs in a cold state. The method comprises: d) providing a first current, in value lower than a desired current, by the LED driver to the plurality of series connected LEDs, resulting in a forward voltage across the plurality of series connected LEDs lower than the maximum allowed voltage output of the LED driver, e) waiting during a predetermined wait time period, f) stepping up of the first current to a second current provided by the LED driver to the plurality of series connected LEDs.
A method for starting up an illuminating process of a plurality of series connected LEDs by means of a LED driver is described, whereby a maximum allowed voltage output of the LED driver is lower than a forward voltage of the plurality of series connected LEDs in a cold state. The method comprises: d) providing a first current, in value lower than a desired current, by the LED driver to the plurality of series connected LEDs, resulting in a forward voltage across the plurality of series connected LEDs lower than the maximum allowed voltage output of the LED driver, e) waiting during a predetermined wait time period, f) stepping up of the first current to a second current provided by the LED driver to the plurality of series connected LEDs.
a detecting circuit configured to derive timing data from the edges of the signal, to estimate a load of the power converter from at least one output parameter of the power converter, and to determine a momentary value of a voltage of the power supply from the timing data and the estimated load of the power converter.
H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
H05B 45/385 - Switched mode power supply [SMPS] using flyback topology
An LED light unit comprises an LED assembly and a light sensor to measure light emitted by the LED assembly and having a measurement range; a current source to drive the LED assembly at an LED current
scale the stray light corrected light measurement signal by a scaling factor based on a ratio of the operating LED current and the measurement LED current to obtain a scaled operating current LED light output signal and derive an illumination of the light sensor therefrom.
raising an output level of the I/O terminal of the first circuit to a level that is at least equal to the high level during at least part of a period when the output level of the I/O terminal of the second circuit corresponds to the high level, thereby charging the electric energy storage element.
controlling the plurality of light sources to generate an illumination in accordance with the respective plurality of illumination set points, thereby displaying the image.
An LED driver has outputs to drive LEDs in groups of different colour temperatures. An input is configured to receive setpoint information, and a control device is configured to determine a combined LED setpoint intensity for the groups and a combined LED setpoint colour temperature for the groups, from the LED setpoint information. If the LED setpoint intensity is above a threshold, the control device operates the LED driver outputs to mix the LED group outputs to jointly achieve the LED setpoint intensity and the LED setpoint colour temperature. If the LED setpoint intensity is below the threshold, the control device selects a single LED group, operates the LED driver output associated with the selected LED group to drive that one LED group at the LED setpoint intensity, and operates the remaining LED driver outputs to drive the remaining LED groups at zero LED intensity.
H05B 45/48 - Details of LED load circuits with an active control inside an LED matrix having LEDs organised in strings and incorporating parallel shunting devices
A modular system comprising a first component comprising an LED driver and is second component comprising a light engine is described. —the LED driver comprising: a switched mode power converter configured to output a supply current; a first control unit configured to control a switch of the switched mode power converter, thereby controlling the supply current; —the light engine comprising: an LED assembly configured to receive the supply current, the LED) assembly comprising a plurality of LEDs and one or more switches arranged in series or in parallel, with one or more LEDs of the plurality of LEDs, and a second control unit configured to control the one or more switches of the LED assembly, thereby controlling an LED current through the plurality of LEDs; wherein the first control unit is configured to control an amplitude of the supply current, the second control unit is configured to control a duty cycle of the LED current through the plurality of LEDs and wherein the first and second control unit are configured to synchronize to switching operation of the switch of the switched mode power converter with a switching operation of the one or more switches of the light engine.
H05B 45/14 - Controlling the intensity of the light using electrical feedback from LEDs or from LED modules
H05B 45/48 - Details of LED load circuits with an active control inside an LED matrix having LEDs organised in strings and incorporating parallel shunting devices
The present invention pertains to a system and method for operating at least one LED unit of lighting grid comprising a plurality of LED units, wherein the LED units are configured to transmit a VLC signal including a code word. A plurality of user equipment devices captures the light transmitted by the LED unit and determines parameters related to the light, such as a VLC quality parameter, flicker value, light intensity parameter and light colour parameter. Based on these parameters, a controller determines control parameters for the LED unit. As such, a feedback loop is created wherein the LED unit is controlled based on measurements with the user equipment devices.
H04B 10/00 - Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
09 - Scientific and electric apparatus and instruments
Goods & Services
Control-regulating equipment and instruments for lighting, namely, electrical controllers, electric switch plates, electric light dimmers, electric light switches; apparatus and instruments for conducting, switching, transforming, accumulating, regulating or controlling electricity, namely, power access port for use with electrical control panels for connecting multiple data and electrical devices, power amplifiers, power controllers, power transformers for amplification, electrical transformers, accumulator boxes, electric conductors, switchboards, electronic regulating and control devices for the operation of light emitting diodes; data processing equipment, namely, data processors
An LED light unit comprises an LED assembly and a light sensor to measure light emitted by the LED assembly and having a measurement range; a current source to drive the LED assembly at an LED current, A control device is configured to: - pre-heat the LED assembly by driving the current source to operate the LED assembly at an operating current; the LED assembly thereby illuminating the light sensor at a light level above the measurement range; - interrupt operating the LED assembly during a stray light measurement time; and read an output signal of the light sensor; - operate the LED assembly at a measurement current, to emit light at a measurement level; - subtract the output signal of the light sensor during the stray light measurement time from the output signal of the light sensor during the light measurement time to obtain a stray light corrected light measurement signal; - scale the stray light corrected light measurement signal by a scaling factor based on a ratio of the operating LED current and the measurement LED current to obtain a scaled operating current LED light output signal and derive an illumination of the light sensor therefrom.
An LED light unit comprises an LED assembly and a light sensor to measure light emitted by the LED assembly and having a measurement range; a current source to drive the LED assembly at an LED current, A control device is configured to: - pre-heat the LED assembly by driving the current source to operate the LED assembly at an operating current; the LED assembly thereby illuminating the light sensor at a light level above the measurement range; - interrupt operating the LED assembly during a stray light measurement time; and read an output signal of the light sensor; - operate the LED assembly at a measurement current, to emit light at a measurement level; - subtract the output signal of the light sensor during the stray light measurement time from the output signal of the light sensor during the light measurement time to obtain a stray light corrected light measurement signal; - scale the stray light corrected light measurement signal by a scaling factor based on a ratio of the operating LED current and the measurement LED current to obtain a scaled operating current LED light output signal and derive an illumination of the light sensor therefrom.
output, via an output terminal of the control unit, one or more control signals to drive the plurality of LEDs or LED groups in accordance with the adjusted current profile or profiles.
An LED driver comprises a current source and a power supply configured to provide a power supply output voltage to the current source. The LED driver further comprises a controller configured to measure a voltage drop over the current source and to generate a feedback signal in response to the measured voltage drop. The power supply comprises a power supply regulator configured to regulate the power supply output voltage of the power supply between a minimum power supply output voltage and a maximum power supply output voltage, the power supply regulator comprising a power supply regulator input.
The feedback signal is provided to the power supply regulator input, in a range from a first feedback signal value representing a minimum power supply output voltage to a second feedback signal value representing a maximum power supply output voltage.
At a start-up of the LED driver, the controller provides the feedback signal at the first feedback signal value, and the power supply regulator, in response to receiving the first feedback signal value, controls the power supply to provide the minimum power supply output voltage.
H05B 45/385 - Switched mode power supply [SMPS] using flyback topology
H05B 45/54 - Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDsCircuit arrangements for operating light-emitting diodes [LED] responsive to LED lifeProtective circuits in a series array of LEDs
A method of connecting a circuit board to a housing is disclosed, the method comprising: • - providing a circuit board (300) with a grounding contact, the grounding contact comprising a through hole; • - providing a bus or bushing (320) into the through hole, the bus or bushing (320) comprising one or more deformable members, the one or more deformable members at least partially obscuring a passage through the through hole of the circuit board (300); • - providing a housing (350), the housing (350) comprising a conducting member (360) that is arranged on a surface of the housing (350); • - assembling the circuit board (300) and the housing (350), thereby connecting the circuit board (300) to the housing (350) by providing a contact between the conducting member (360) and the one or more deformable members.
According to a first aspect of the invention, a control circuit and method are provided for a controlled start-up of N LED groups, wherein the control circuit comprises a LED switching element and a chargeable element in parallel with each LED group, and a low- power source, and wherein the method comprises a step of prior to supplying power to the LED groups, setting the LED switching elements in a second state which corresponds with the LED group being off, by charging the chargeable elements with the low-power source. According to a second aspect a control circuit and method are provided for controlling X LED groups, wherein the control circuit comprises a LED switching element and a chargeable element in parallel with each LED group, wherein the top of a lower chargeable element is connected via a diode with the top of a higher chargeable element. According to a third aspect of the invention, a control circuit and method are provided for controlling M LED groups, wherein the control circuit comprises a LEDswitching element and a chargeable element in parallel with each LED group, and a switch, wherein the switch has a lighting mode wherein current flows through the LED groups or the corresponding LED switching elements, and a charging mode wherein current flows to the chargeable elements, thereby charging the chargeable elements.
According to a first aspect of the invention, a control circuit and method are provided for a controlled start-up of N LED groups, wherein the control circuit comprises a LED switching element and a chargeable element in parallel with each LED group, and a low- power source, and wherein the method comprises a step of prior to supplying power to the LED groups, setting the LED switching elements in a second state which corresponds with the LED group being off, by charging the chargeable elements with the low-power source. According to a second aspect a control circuit and method are provided for controlling X LED groups, wherein the control circuit comprises a LED switching element and a chargeable element in parallel with each LED group, wherein the top of a lower chargeable element is connected via a diode with the top of a higher chargeable element. According to a third aspect of the invention, a control circuit and method are provided for controlling M LED groups, wherein the control circuit comprises a LED switching element and a chargeable element in parallel with each LED group, and a switch, wherein the switch has a lighting mode wherein current flows through the LED groups or the corresponding LED switching elements, and a charging mode wherein current flows to the chargeable elements, thereby charging the chargeable elements.
A method of capturing an image of a scene using a user device having a rolling shutter camera is described, the scene being subjected to an illumination by an LED light source, the method comprising: providing, by the user device, a notification signal to the LED light source, the notification signal being indicative of a capturing or imminent capturing of an image; adjusting, by the LED light source, an operating characteristic of the LED light source, based on the notification signal; capturing, by the rolling shutter camera, the image of the scene, while the LED light source is operating at the adjusted operating characteristic.
The present invention pertains to a system and method for operating at least one LED unit of lighting grid comprising a plurality of LED units, wherein the LED units are configured to transmit a VLC signal including a code word. A plurality of user equipment devices captures the light transmitted by the LED unit and determines parameters related to the light, such as a VLC quality parameter, flicker value, light intensity parameter and light colour parameter. Based on these parameters, a controller determines control parameters for the LED unit. As such, a feedback loop is created wherein the LED unit is controlled based on measurements with the user equipment devices.
An LED driver is described, the LED driver comprising: a back end module BE comprising a switch mode power converter SMPS configured to operate in a self-oscillating current control mode, the back end module BE further comprising: an input terminal configured to receive a DC bus voltage; an output terminal configured to output a supply current for powering an LED fixture; a control unit configured to control the back end module to operate the SMPS in a voltage control mode by: determining a switching frequency of the SMPS when operating in the self-oscillating current control mode; determining a minimal switching frequency of the SMPS and receiving an input signal representative of the supply current for powering the LED fixture; wherein the control unit is further configured to control the switch of the SMPS in the voltage control mode by: operating the switch of the SMPS at a substantially constant frequency based on the determined minimal switching frequency and modulating a duty cycle of the switch to maintain the supply current at a desired current.
H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
An LED driver is described, the LED driver comprising: a back end module BE comprising a switch mode power converter SMPS configured to operate in a self-oscillating current control mode, the back end module BE further comprising: an input terminal configured to receive a DC bus voltage; an output terminal configured to output a supply current for powering an LED fixture; a control unit configured to control the back end module to operate the SMPS in a voltage control mode by: determining a switching frequency of the SMPS when operating in the self-oscillating current control mode; determining a minimal switching frequency of the SMPS and receiving an input signal representative of the supply current for powering the LED fixture; wherein the control unit is further configured to control the switch of the SMPS in the voltage control mode by: operating the switch of the SMPS at a substantially constant frequency based on the determined minimal switching frequency and modulating a duty cycle of the switch to maintain the supply current at a desired current.
H05B 33/08 - Circuit arrangements for operating electroluminescent light sources
H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
A power converter powers an LED fixture from a power supply, and comprises a -primary circuit -a primary winding; and -a switch in series connection with the primary winding to in a conductive state of the switch connect the primary winding to the power supply; -secondary circuit comprising -a secondary winding that is magnetically coupled with the primary winding for providing power to the LED fixture in response to a switching of the switch; -the power converter further comprising: -the power converter further comprising: -a sensing circuit configured to generate a signal representative of the output voltage of the secondary winding, an edge of the signal representing an edge of the output voltage of the secondary winding in response to the switching of the switch; and -a detecting circuit configured to derive timing data from the edges of the signal, to estimate a load of the power converter from at least one output parameter of the power converter, and to determine a momentary value of a voltage of the power supply from the timing data and the estimated load of the power converter.
H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
A power converter powers an LED fixture from a power supply, and comprises a -primary circuit -a primary winding; and -a switch in series connection with the primary winding to in a conductive state of the switch connect the primary winding to the power supply; -secondary circuit comprising -a secondary winding that is magnetically coupled with the primary winding for providing power to the LED fixture in response to a switching of the switch; -the power converter further comprising: -the power converter further comprising: -a sensing circuit configured to generate a signal representative of the output voltage of the secondary winding, an edge of the signal representing an edge of the output voltage of the secondary winding in response to the switching of the switch; and -a detecting circuit configured to derive timing data from the edges of the signal, to estimate a load of the power converter from at least one output parameter of the power converter, and to determine a momentary value of a voltage of the power supply from the timing data and the estimated load of the power converter.
H05B 33/08 - Circuit arrangements for operating electroluminescent light sources
H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
59.
Light unit and method of light unit replacement based on a visual light communication code stored in a data storage memory of the light module or the driver module
A method of replacing one of a light module and a driver module of a light unit includes reading a VLC code from a data storage memory of one of the light module and the driver. The visible light communication (VLC) code is transferred, via a connection between the light module and the driver module, and stored in the other one of the light module and the driver module. One of the light module and the driver module is elected for replacement. The VLC code from the other one of the light module and the driver module is transferred to the replaced one of the light module and the driver module. The transferred VLC code is stored in the data storage memory of the replaced one of the light module and the driver module.
H05B 45/14 - Controlling the intensity of the light using electrical feedback from LEDs or from LED modules
H05B 45/50 - Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDsCircuit arrangements for operating light-emitting diodes [LED] responsive to LED lifeProtective circuits
H05B 47/20 - Responsive to malfunctions or to light source lifeCircuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant for protection
09 - Scientific and electric apparatus and instruments
Goods & Services
LED lighting systems, namely, LED position sensors, drivers, light controls, and transformers; LED dimmers for adjusting color temperature and color intensity of lighting; electronic digital multiplex (DMX) controllers used in LED lighting applications; lighting controls; computer hardware and recorded software systems for remote lighting control; electronic regulating and control devices for the operation of light emitting diodes; wireless controllers to remotely monitor and control the function and status of LED lights
61.
METHOD OF CONTROLLING AN LED SOURCE AND AN LED BASED LIGHT SOURCE
An LED driver configured to power a plurality of LEDs having a different colour or colour spectrum is described, the LED driver comprising: - a power converter configured to supply power to the plurality of LEDs and - a control unit, the control unit comprising: an input terminal configured to receive an input signal representing a desired colour set-point; a processing unit configured to: determine a MacAdam ellipse for the desired colour set-point; determine a required intensity or current for each of the plurality of LEDs so as to achieve the desired colour set-point; determine a colour shift direction for the colour set-point, based on the determined required intensities or currents; select a modified colour set-point based on the colour shift direction and the MacAdam ellipse; determine a required supply current for each of the plurality of LEDs so as to achieve the modified colour set-point; determine a control signal for the power converter so as to generate the required supply currents; and wherein the control unit further comprises an output terminal for outputting the control signal to the power converter.
An LED driver configured to power a plurality of LEDs having a different colour or colour spectrum is described, the LED driver comprising: - a power converter configured to supply power to the plurality of LEDs and - a control unit, the control unit comprising: an input terminal configured to receive an input signal representing a desired colour set-point; a processing unit configured to: determine a MacAdam ellipse for the desired colour set-point; determine a required intensity or current for each of the plurality of LEDs so as to achieve the desired colour set-point; determine a colour shift direction for the colour set-point, based on the determined required intensities or currents; select a modified colour set-point based on the colour shift direction and the MacAdam ellipse; determine a required supply current for each of the plurality of LEDs so as to achieve the modified colour set-point; determine a control signal for the power converter so as to generate the required supply currents; and wherein the control unit further comprises an output terminal for outputting the control signal to the power converter.
A method of operating a distributed light source and a distributed light source are disclosed. The distributed light source comprising a plurality of light sources to display an image, the method comprising the steps of: - transmitting the image to be displayed to the plurality of light sources, the image being described in an image coordinate system; - providing to each of the light sources information indicative of a position of the light source in the image; - determining, by each of the light sources, an illumination set point for the light source, based on the position information and the transmitted image, and - controlling the plurality of light sources to generate an illumination in accordance with the respective plurality of illumination set points, thereby displaying the image.
G09F 9/33 - Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes
G09F 19/22 - Advertising or display means on roads, walls or similar surfaces, e.g. illuminated
G09G 3/32 - Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
H05B 45/00 - Circuit arrangements for operating light-emitting diodes [LED]
H05B 45/10 - Controlling the intensity of the light
H05B 47/155 - Coordinated control of two or more light sources
64.
METHOD OF OPERATING A DISTRIBUTED LIGHT SOURCE AND DISTRIBUTED LIGHT SOURCE
A method of operating a distributed light source and a distributed light source are disclosed. The distributed light source comprising a plurality of light sources to display an image, the method comprising the steps of: - transmitting the image to be displayed to the plurality of light sources, the image being described in an image coordinate system; - providing to each of the light sources information indicative of a position of the light source in the image; - determining, by each of the light sources, an illumination set point for the light source, based on the position information and the transmitted image, and - controlling the plurality of light sources to generate an illumination in accordance with the respective plurality of illumination set points, thereby displaying the image.
A modular system includes an LED driver and an LED light engine. The driver includes a switched mode power converter and a first control unit to control a switch of the converter, thereby controlling the supply current to an LED assembly of the light engine. The assembly includes LEDs and one or more switches arranged in series or in parallel with one or more of the LEDs. The light engine also includes a second control unit controlling the one or more switches of the LED assembly so as to control current through the LEDs. The first control unit controls amplitude of the supply current. The second control unit controls duty cycle of the LED current through the LEDs. The first and second control units are configured to synchronize a switching operation of the switched mode power converter with a switching operation of the switches of the light engine.
H05B 45/48 - Details of LED load circuits with an active control inside an LED matrix having LEDs organised in strings and incorporating parallel shunting devices
A modular system includes an LED driver, including a switched mode power converter configured to output a supply current and a first control unit configured to control a switch of the switched mode power converter, and a light engine, including an LED assembly configured to receive the supply current, the LED assembly including a plurality of LEDs and one or more switches arranged in series or in parallel with one or more LEDs of the plurality of LEDs, and a second control unit configured to control the one or more switches of the LED assembly. The first control unit is configured to control an amplitude of the supply current. The second control unit is configured to control a duty cycle of the LED current through the plurality of LEDs.
H05B 45/24 - Controlling the colour of the light using electrical feedback from LEDs or from LED modules
H05B 45/44 - Details of LED load circuits with an active control inside an LED matrix
H05B 45/48 - Details of LED load circuits with an active control inside an LED matrix having LEDs organised in strings and incorporating parallel shunting devices
67.
SYSTEM AND METHOD FOR OPERATING AT LEAST ONE LED UNIT OF A LIGHTING GRID COMPRISING A PLURALITY OF LED UNITS
The present invention pertains to a system and method for operating at least one LED unit of lighting grid comprising a plurality of LED units, wherein the LED units are configured to transmit a VLC signal including a code word. A plurality of user equipment devices captures the light transmitted by the LED unit and determines parameters related to the light, such as a VLC quality parameter, flicker value, light intensity parameter and light colour parameter. Based on these parameters, a controller determines control parameters for the LED unit. As such, a feedback loop is created wherein the LED unit is controlled based on measurements with the user equipment devices.
An LED driver comprises a current source and a power supply configured to provide a power supply output voltage to the current source. The LED driver further comprises a controller configured to measure a voltage drop over the current source and to generate a feedback signal in response to the measured voltage drop. The power supply comprises a power supply regulator configured to regulate the power supply output voltage of the power supply between a minimum power supply output voltage and a maximum power supply output voltage, the power supply regulator comprising a power supply regulator input. The feedback signal is provided to the power supply regulator input, in a range from a first feedback signal value representing a minimum power supply output voltage to a second feedback signal value representing a maximum power supply output voltage. At a start-up of the LED driver, the controller provides the feedback signal at the first feedback signal value, and the power supply regulator, in response to receiving the first feedback signal value, controls the power supply to provide the minimum power supply output voltage.
An LED driver comprises a current source and a power supply configured to provide a power supply output voltage to the current source. The LED driver further comprises a controller configured to measure a voltage drop over the current source and to generate a feedback signal in response to the measured voltage drop. The power supply comprises a power supply regulator configured to regulate the power supply output voltage of the power supply between a minimum power supply output voltage and a maximum power supply output voltage, the power supply regulator comprising a power supply regulator input. The feedback signal is provided to the power supply regulator input, in a range from a first feedback signal value representing a minimum power supply output voltage to a second feedback signal value representing a maximum power supply output voltage. At a start-up of the LED driver, the controller provides the feedback signal at the first feedback signal value, and the power supply regulator, in response to receiving the first feedback signal value, controls the power supply to provide the minimum power supply output voltage.
A method of transferring power and data between a first circuit and a second circuit, the method comprising: .cndot. - operating the I/O terminal of the second circuit as an output terminal and the I/O terminal of the first circuit as an input terminal; .cndot. - transmitting data from the second circuit to the first circuit by modulating an output level between a high level and a low level; .cndot. - determining whether ouput level of the second circuit is high or low and, when the output is high: .cndot. - operating the I/O terminal of the first circuit as an output terminal; and .cndot. - raising the output level the first circuit to high during at least part of a period when the output level of the I/O terminal of the second circuit is high, thereby charging the electric energy storage element.
A method of transferring power and data between a first circuit and a second circuit, the method comprising: • - operating the I/O terminal of the second circuit as an output terminal and the I/O terminal of the first circuit as an input terminal; • - transmitting data from the second circuit to the first circuit by modulating an output level between a high level and a low level; • - determining whether ouput level of the second circuit is high or low and, when the output is high: • - operating the I/O terminal of the first circuit as an output terminal; and • - raising the output level the first circuit to high during at least part of a period when the output level of the I/O terminal of the second circuit is high, thereby charging the electric energy storage element.
a detector configured to determine an electrical characteristic of the supply voltage based on the measured electrical characteristic of the secondary circuit.
H05B 33/08 - Circuit arrangements for operating electroluminescent light sources
H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
H05B 45/385 - Switched mode power supply [SMPS] using flyback topology
09 - Scientific and electric apparatus and instruments
11 - Environmental control apparatus
35 - Advertising and business services
42 - Scientific, technological and industrial services, research and design
Goods & Services
Computer software; software applications; mobile apps;
software drivers; device drivers; computer application
software; lighting control apparatus; lighting control
software for use in commercial and industrial facilities;
LED drivers; drivers for light-emitting diodes [LED] based
lighting systems. Lighting; lighting apparatus; lighting installations;
light-emitting diodes [led] lighting apparatus; led lighting
installations. Retail and wholesale services in relation to lighting,
computer software, software applications, mobile apps,
software drivers, device drivers, computer application
software, lighting control apparatus, lighting control
software for use in commercial and industrial facilities,
drivers for light-emitting diodes [LED] based lighting
systems, LED drivers, light-emitting diodes [LED] lighting
apparatus, LED lighting installations. Scientific and technology services; design and development
of computer hardware and software; design and development of
driver software; design and development of lighting systems;
developing of driver and operating system software; design
and development of new technology for others; data security
services.
An LED driver for driving a plurality of LEDs or LED groups to transmit light in a VLC mode is described, wherein the LED driver comprises a control unit that is configured to: - receive, at an input terminal, a set-point representing a desired illumination characteristic and data that is to be transmitted using VLC; - determine a current profile for each of the plurality of LEDs or LED groups to generate the desired illumination characteristic, whereby an envelope of the combined current profile comprises a modulation in order for a corresponding intensity modulation as perceived by a sensor to represent a variable length VLC code representing the data, the VLC code comprising code words, a code word comprising a plurality of symbols; - generate one or more control signals to drive the plurality of LEDs in accordance with the current profiles in order for the plurality of LEDs or LED groups to transmit the VLC code; and - upon receipt of a further set-point representing a different illumination characteristic during the transmission of the VLC code, determine an adjusted current profile or profiles for one or more of the plurality of LEDs or LED groups based on the different illumination characteristic, whereby the current profile is only adjusted for some, not all, symbols of a next code word to be transmitted; - generate one or more control signals to drive the plurality of LEDs or LED groups in accordance with the adjusted current profile or profiles, and - output, via an output terminal of the control unit, one or more control signals to drive the plurality of LEDs or LED groups in accordance with the adjusted current profile or profiles.
An LED driver for driving a plurality of LEDs or LED groups to transmit light in a VLC mode is described, wherein the LED driver comprises a control unit that is configured to: - receive, at an input terminal, a set-point representing a desired illumination characteristic and data that is to be transmitted using VLC; - determine a current profile for each of the plurality of LEDs or LED groups to generate the desired illumination characteristic, whereby an envelope of the combined current profile comprises a modulation in order for a corresponding intensity modulation as perceived by a sensor to represent a variable length VLC code representing the data, the VLC code comprising code words, a code word comprising a plurality of symbols; - generate one or more control signals to drive the plurality of LEDs in accordance with the current profiles in order for the plurality of LEDs or LED groups to transmit the VLC code; and - upon receipt of a further set-point representing a different illumination characteristic during the transmission of the VLC code, determine an adjusted current profile or profiles for one or more of the plurality of LEDs or LED groups based on the different illumination characteristic, whereby the current profile is only adjusted for some, not all, symbols of a next code word to be transmitted; - generate one or more control signals to drive the plurality of LEDs or LED groups in accordance with the adjusted current profile or profiles, and - output, via an output terminal of the control unit, one or more control signals to drive the plurality of LEDs or LED groups in accordance with the adjusted current profile or profiles.
A light source power supply circuit (100) having multiple output channels is described, the light source comprising: a front end circuit (110) comprising a switched mode power converter configured to receive an input voltage (Vin) and provide a regulated front end DC-voltage (Vdc out); a plurality of power converter circuits (120.1, 120.2, 120.3), each of the power converter circuits of the plurality of power converter circuits being configured to receive the regulated front end DC voltage (Vdc out) and provide a separate associated DC output for an associated one of the multiple output channels (120.4, 120.5,120.6); a fault detection circuit (140) configured to detect the occurrence of a fault in one or more of the power converter circuits (120.1,120.2, 120.3) and output, in response, a fault signal (146);
The invention relates to a method for changing the identification code of a light source in a visible light communication system, which visible light communication system comprises the light source, a driver system to drive the light source, and a server that is not able to communicate directly with the driver system, and which method makes use of a first mobile device comprising an image sensor, a processing unit, a network adapter, and a transmitter, wherein the processing unit is configured to process an output of the image sensor, wherein the processing unit is configured to communicate with the server via the network adapter, and wherein the processing unit is configured to send signals to the driver system using the transmitter, said method comprising the following steps: a. receiving a signal from the server by the network adapter of the first mobile device, said signal comprising a command to change the identification code of the light source from a first ID code to a second ID code; and b. transmitting, by the transmitter of the first mobile device, a signal to the driver system, said signal comprising a command to change the identification code of the light source to a second ID code.
H04B 10/00 - Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
A method of replacing one of a light module and a driver module of a light unit, wherein the light module and the driver module each comprise a data storage memory and wherein a visual light communication, VLC, code has been stored in one of the data storage memory of the light module and the data storage memory of the driver module. The driver module is configured to drive the light module so as to optically emit, by means of a modulation of a light output of the light module, information based on the VLC code. The method comprises: a) reading the VLC code from the one of the data storage memory of the light module and the data storage memory of the driver module; b) transferring the VLC code via a connection between the light module and the driver module; c) storing the transferred VLC code in the other one of the light module and the driver module; d) electing one of the light module and the driver module for replacement; e) replacing the one of the light module and the driver module elected for replacement; and f) transferring the VLC code from the other one of the light module and the driver module to the replaced one of the light module and the driver module and g) storing the transferred VLC code in the data storage memory of the replaced one of the light module and the driver module.
H05B 45/50 - Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDsCircuit arrangements for operating light-emitting diodes [LED] responsive to LED lifeProtective circuits
A method of replacing one of a light module and a driver module of a light unit, wherein the light module and the driver module each comprise a data storage memory and wherein a visual light communication, VLC, code has been stored in one of the data storage memory of the light module and the data storage memory of the driver module. The driver module is configured to drive the light module so as to optically emit, by means of a modulation of a light output of the light module, information based on the VLC code. The method comprises: a) reading the VLC code from the one of the data storage memory of the light module and the data storage memory of the driver module; b) transferring the VLC code via a connection between the light module and the driver module; c) storing the transferred VLC code in the other one of the light module and the driver module; d) electing one of the light module and the driver module for replacement; e) replacing the one of the light module and the driver module elected for replacement; and f) transferring the VLC code from the other one of the light module and the driver module to the replaced one of the light module and the driver module and g) storing the transferred VLC code in the data storage memory of the replaced one of the light module and the driver module.
The present invention relates to a lighting application, the lighting application comprises an LED assembly comprising a serial connection of two or more LED units, each LED unit comprising one or more LEDs, each LED unit being provided with a controllable switch for substantially short-circuiting the LED unit. The lighting application further comprises a control unit for controlling a drive unit and arranged to receive a signal representing a voltage level of the supply voltage, and control the switches in accordance with the signal. The invention further provides for an LED driver that enables to operate a TRIAC based dimmer at an optimal holding current and an LED driver comprising a switchable buffer, e.g. a capacitor.
A control unit for an LED assembly comprising a first and second LED unit, said LED units being serial connected is described. The LED assembly, in use, is powered by a switched mode power supply. The control unit being arranged to receive an input signal representing a desired output characteristic of the LED assembly, determine a first and second duty cycle for respective LED units associated with a nominal current of the switched mode power supply, for providing the desired output characteristic, determine the largest of the first and second duty cycles for respective LED units, determine a reduced current based on at least the largest of the duty cycles, adjust the first and second duty cycle for respective LED units based on the reduced current, provide an output signal for the LED assembly and the switched mode power supply based on the adjusted first and second duty cycles and the reduced current for obtaining the desired characteristic.
An LED fixture includes at least one LED; an electrical power terminal, electrically connected to the LED, the electrical power terminal for electrically connecting the LED to an LED driver, a storage device for storing data in relation to the LED, and a data processing device, electrically connected to the storage device for storing data in the storage device and reading data therefrom, the data processing device being arranged and connected for providing data communication via at least one of the electrical power terminal and the LED.
A control unit for a LED assembly includes a first and second LED unit, the LED units being serial connected. The LED assembly, in use, is powered by a switched mode power supply. The control unit being arranged to receive an input signal representing a desired output characteristic of the LED assembly, determine a first and second duty cycle for respective LED units associated with a nominal current of the switched mode power supply, for providing the desired output characteristic, determine the largest of the first and second duty cycles for respective LED units, determine a reduced current based on at least the largest of the duty cycles, adjust the first and second duty cycle for respective LED units based on the reduced current, and provide an output signal for the LED assembly and the switched mode power supply based on the adjusted first and second duty cycles and the reduced current for obtaining the desired characteristic.
An LED driver is configured to drive a plurality of LEDs, the LEDs being arranged in groups having respective different colour temperatures. The LED driver comprises respective LED driver outputs, each LED driver output being connected to a respective one of the LED groups for driving that LED group. The LED driver comprises a setpoint input configured to receive setpoint information, and a control device, the control device being configured to operate the LED driver outputs so as to drive the LED groups in accordance with the setpoint information. The control device is configured to: determine an LED setpoint intensity and an LED setpoint colour temperature from the LED setpoint information, the LED setpoint intensity representing a desired combined intensity of the LED groups, the LED setpoint colour temperature representing a desired combined colour of the LED groups; and compare the LED setpoint intensity to a predetermined threshold. In case the LED setpoint intensity is above the predetermined threshold, the control device operates the LED driver outputs to mix the LED groups to jointly operate at the LED setpoint intensity and the LED setpoint colour temperature. In case the LED setpoint intensity is below the predetermined threshold, the control device select a single one of the LED groups, operates the LED driver output associated with the selected single one of the LED groups to drive the selected single one of the LED groups at the LED setpoint intensity, and operates the remaining LED driver outputs to drive the remaining LED groups at zero LED intensity.
A modular system comprising a first component comprising an LED driver and a second component comprising a light engine is described. the LED driver comprising: a.a switched mode power converter configured to output a supply current; b.a first control unit configured to control a switch of the switched mode power converter, thereby controlling the supply current; the light engine comprising: c.an LED assembly configured to receive the supply current, the LED assembly comprising a plurality of LEDs and one or more switches arranged in series or in parallel with one or more LEDs of the plurality of LEDs, and d.a second control unit configured to control the one or more switches of the LED assembly, thereby controlling an LED current through the plurality of LEDs; wherein the first control unit is configured to control an amplitude of the supply current, the second control unit is configured to control a duty cycle of the LED current through the plurality of LEDs and wherein the first and second control unit are configured to synchronize a switching operation of the switch of the switched mode power converter with a switching operation of the one or more switches of the light engine.
A modular system comprising a first component comprising an LED driver and a second component comprising a light engine is described. the LED driver comprising: a.a switched mode power converter configured to output a supply current; b.a first control unit configured to control a switch of the switched mode power converter, thereby controlling the supply current; the light engine comprising: c.an LED assembly configured to receive the supply current, the LED assembly comprising a plurality of LEDs and one or more switches arranged in series or in parallel with one or more LEDs of the plurality of LEDs, and d.a second control unit configured to control the one or more switches of the LED assembly, thereby controlling an LED current through the plurality of LEDs; wherein the first control unit is configured to control an amplitude of the supply current, the second control unit is configured to control a duty cycle of the LED current through the plurality of LEDs and wherein the first and second control unit are configured to synchronize a switching operation of the switch of the switched mode power converter with a switching operation of the one or more switches of the light engine.
An LED driver is configured to drive a plurality of LEDs, the LEDs being arranged in groups having respective different colour temperatures. The LED driver comprises respective LED driver outputs, each LED driver output being connected to a respective one of the LED groups for driving that LED group. The LED driver comprises a setpoint input configured to receive setpoint information, and a control device, the control device being configured to operate the LED driver outputs so as to drive the LED groups in accordance with the setpoint information. The control device is configured to: determine an LED setpoint intensity and an LED setpoint colour temperature from the LED setpoint information, the LED setpoint intensity representing a desired combined intensity of the LED groups, the LED setpoint colour temperature representing a desired combined colour of the LED groups; and compare the LED setpoint intensity to a predetermined threshold. In case the LED setpoint intensity is above the predetermined threshold, the control device operates the LED driver outputs to mix the LED groups to jointly operate at the LED setpoint intensity and the LED setpoint colour temperature. In case the LED setpoint intensity is below the predetermined threshold, the control device select a single one of the LED groups, operates the LED driver output associated with the selected single one of the LED groups to drive the selected single one of the LED groups at the LED setpoint intensity, and operates the remaining LED driver outputs to drive the remaining LED groups at zero LED intensity.
A method for driving a light source includes the following steps: a. providing a code to be transmitted by the light source; b. converting the code into a sequence of different current levels, which current levels are maintained for a predetermined period of time; and c. providing the sequence of different current levels to the light source such that the light source emits light at different intensity levels, where driving the light source is carried out using a set-point update rate having a set-point update period, and where transitions between the different current levels take more than one set-point update period.
A modular system comprising a first component comprising an LED driver and a second component comprising a light engine is described. -the LED driver comprising: a switched mode power converter configured to output a supply current; a first control unit configured to control a switch of the switched mode power converter, thereby controlling the supply current; -the light engine comprising: an LED assembly configured to receive the supply current, the LED assembly comprising a plurality of LEDs and one or more switches arranged in series or in parallel with one or more LEDs of the plurality of LEDs, and a second control unit configured to control the one or more switches of the LED assembly, thereby controlling an LED current through the plurality of LEDs; wherein the first control unit is configured to control an amplitude of the supply current, the second control unit is configured to control a duty cycle of the LED current through the plurality of LEDs and wherein the first and second control unit are configured to synchronize a switching operation of the switch of the switched mode power converter with a switching operation of the one or more switches of the light engine.
A modular system comprising a first component comprising an LED driver and a second component comprising a light engine is described. -the LED driver comprising: a switched mode power converter configured to output a supply current; a first control unit configured to control a switch of the switched mode power converter, thereby controlling the supply current; -the light engine comprising: an LED assembly configured to receive the supply current, the LED assembly comprising a plurality of LEDs and one or more switches arranged in series or in parallel with one or more LEDs of the plurality of LEDs, and a second control unit configured to control the one or more switches of the LED assembly, thereby controlling an LED current through the plurality of LEDs; wherein the first control unit is configured to control an amplitude of the supply current, the second control unit is configured to control a duty cycle of the LED current through the plurality of LEDs and wherein the first and second control unit are configured to synchronize a switching operation of the switch of the switched mode power converter with a switching operation of the one or more switches of the light engine.
A light unit driver comprising a plurality of light unit driver channels, each light unit driver channel being configured for driving a respective light unit via a respective light unit driver channel output of the light unit driver channel, —a supply rail that is connected to respective power inputs of the light unit driver channels to conduct electrical energy to the light unit driver channels, —a backup energy storage configured for storing electrical energy, —a control device for controlling the light unit driver, The backup energy storage is electrically connected to the light unit driver channel output of one of the light unit driver channels, the light units being connected to the light unit driver channel outputs of the remaining light unit driver channels. The control device is configured to: —in an operational mode, operate the one of the light unit driver channels to charge the backup energy storage via the one of the light unit driver channel outputs to which the backup energy storage is connected, and operate the remaining light unit driver channels to drive the light units, and—in an emergency mode, operate the one of the light unit driver channels to feed energy back to the supply rail to power the remaining light unit driver channels via the one of the light unit driver channels from the backup energy storage.
H02J 9/06 - Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over
H05B 33/08 - Circuit arrangements for operating electroluminescent light sources
H02J 7/02 - Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from AC mains by converters
H02J 7/00 - Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
A power converter for supplying an output voltage or an output current for powering an LED fixture is described, the power converter comprising: - a primary circuit comprising: o an input terminal for receiving a supply voltage; o a primary winding connected to the input terminal; - a secondary circuit comprising a secondary winding that is magnetically coupled with the primary winding for providing the output voltage or output current; - the power converter further comprising: o a sensor for measuring an electrical characteristic of the secondary circuit and; o a detector configured to determine an electrical characteristic of the supply voltage based on the measured electrical characteristic of the secondary circuit.
A power converter for supplying an output voltage or an output current for powering an LED fixture is described, the power converter comprising: - a primary circuit comprising: o an input terminal for receiving a supply voltage; o a primary winding connected to the input terminal; - a secondary circuit comprising a secondary winding that is magnetically coupled with the primary winding for providing the output voltage or output current; - the power converter further comprising: o a sensor for measuring an electrical characteristic of the secondary circuit and; o a detector configured to determine an electrical characteristic of the supply voltage based on the measured electrical characteristic of the secondary circuit.
A control circuit for an LED fixture comprising a first and a second LED group, each LED group comprising at least one LED, the control circuit comprising: -an input terminal for receiving a tri-state output signal from a control unit; -a first output terminal for providing a first control signal for controlling a first switch associated with the first LED group; -a second output terminal for providing a second control signal for controlling a second switch associated with the second LED group; the control circuit further being arranged to transform each state of the tri-state output signal to a distinct pair of control signals comprising the first control signal and the second control signal, so as to obtain three distinct operating states of the LED fixture.
A method of operating a lighting grid having lighting units the method—including receiving an input signal from a sensor or a user interface by a first lighting unit, determining a control signal for controlling an LED driver and/or LED assembly of the first lighting unit based on the input signal, transmitting an output signal to a second lighting unit, the output signal being based on the input signal and enabling an identification of the first lighting unit, the sensor or the user interface, receiving the transmitted output signal from the first lighting unit by the second lighting unit, establishing an identification, based upon the received output signal, of the first lighting unit, the sensor or the user—interface, and determining a further control signal for controlling an LED driver and/or LED assembly of the second lighting unit based on the output signal and the identification.
09 - Scientific and electric apparatus and instruments
Goods & Services
Control-regulating equipment and instruments for lighting, namely, electrical controllers, electric switch plates, electric light dimmers, electric light switches; apparatus and instruments for conducting, switching, transforming, accumulating, regulating or controlling electricity, namely, power access port for use with electrical control panels for connecting multiple data and electrical devices, power amplifiers, power controllers, power transformers for amplification, electrical transformers, accumulator boxes, electric conductors, switchboards, electronic regulating and control devices for the operation of light emitting diodes; data processing equipment, namely, data processors.
97.
METHOD FOR CHANGING THE IDENTIFICATION CODE OF A LIGHT SOURCE IN VISIBLE LIGHT COMMUNICATION SYSTEMS
The invention relates to a method for changing the identification code of a light source in a visible light communication system, which visible light communication system comprises the light source, a driver system to drive the light source, and a server that is not able to communicate directly with the driver system, and which method makes use of a first mobile device comprising an image sensor, a processing unit, a network adapter, and a transmitter, wherein the processing unit is configured to process an output of the image sensor, wherein the processing unit is configured to communicate with the server via the network adapter, and wherein the processing unit is configured to send signals to the driver system using the transmitter, said method comprising the following steps: a.receiving a signal from the server by the network adapter of the first mobile device, said signal comprising a command to change the identification code of the light source from a first ID code to a second ID code; and b.transmitting, by the transmitter of the first mobile device, a signal to the driver system, said signal comprising a command to change the identification code of the light source to a second ID code.
The invention relates to a method for changing the identification code of a light source in a visible light communication system, which visible light communication system comprises the light source, a driver system to drive the light source, and a server that is not able to communicate directly with the driver system, and which method makes use of a first mobile device comprising an image sensor, a processing unit, a network adapter, and a transmitter, wherein the processing unit is configured to process an output of the image sensor, wherein the processing unit is configured to communicate with the server via the network adapter, and wherein the processing unit is configured to send signals to the driver system using the transmitter, said method comprising the following steps: a.receiving a signal from the server by the network adapter of the first mobile device, said signal comprising a command to change the identification code of the light source from a first ID code to a second ID code; and b.transmitting, by the transmitter of the first mobile device, a signal to the driver system, said signal comprising a command to change the identification code of the light source to a second ID code.
An LED driver for powering an LED fixture includes a power converter for converting an input power such as a rectified mains supply to an output power for powering the LED fixture; a control unit arranged to control an output characteristic of the power converter; optionally, a network terminal connected to the control unit for connecting the control unit to a network, the control unit being arranged to receive a control signal from the network via the network terminal for controlling the output characteristic; an application terminal connected to the control unit for connecting the control unit to a lighting device; the control unit being arranged to: provide a polling signal to the lighting device; receive, in response to the polling signal, a control signal for controlling the output characteristic.
An LED driver comprising a power converter for powering an LED unit and a control unit for controlling the power converter is provided. The power converter comprising an input terminal for receiving a rectified AC supply voltage, and an output terminal for supplying a current to the LED unit, and the control unit comprising an input for receiving a supply signal representative of the supply voltage and an output for providing a control signal to the power converter. The control unit is further arranged to: determine the control signal for controlling the power converter based on the supply signal, and control the power converter to supply the current to the LED unit based on the control signal, the current being amplitude modulated in synchronism or in phase with the rectified AC supply voltage.
H05B 33/08 - Circuit arrangements for operating electroluminescent light sources
F21K 9/23 - Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings
