Abstract: A method of transferring power and data between a first circuit and a second circuit is described, whereby the second circuit comprises a processing unit having an I/O terminal and an electric energy storage element, the electric energy storage element being configured to be charged by the first circuit via the I/O terminal and configured to power the processing unit, the method comprising: establishing a wired communication link between an I/O terminal of the first circuit and the I/O terminal of the second circuit; 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 via the I/O terminal of the second circuit to the I/O terminal of the first circuit by modulating an output level of the I/O terminal of the second circuit between a high level and a low level; determining whether the output level of the I/O terminal of the second circuit corresponds to the high level or the low level and, when the output leve

Abstract: An intelligent lighting system may be installed using pre-existing electrical wiring, such as in a construction or retrofit environment. An intelligent lighting controller and an intelligent lighting fixture may be connected via electrical wiring that is configured for transmitting AC power signals. A commissioning signal may be transmitted to the intelligent lighting fixtures via the electrical wiring. In some cases, the intelligent lighting controller modifies portions of the AC power signal to indicate the commissioning signal. The intelligent lighting fixtures may receive the commissioning signal via the electrical wiring. In some cases, each intelligent lighting fixture that is connected to the electrical wiring, such as each intelligent lighting fixture on a lighting circuit in a room, receives the commissioning signal.

Abstract: A modular system comprising a first component comprising an LED driver and is second component comprising a light engine is described.

Abstract: 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.

Abstract: 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 dur

Abstract: 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.

Abstract: An intelligent lighting system may be installed using pre-existing electrical wiring, such as in a construction or retrofit environment. An intelligent lighting controller and an intelligent lighting fixture may be connected via electrical wiring that is configured for transmitting AC power signals. A commissioning signal may be transmitted to the intelligent lighting fixtures via the electrical wiring. In some cases, the intelligent lighting controller modifies portions of the AC power signal to indicate the commissioning signal. The intelligent lighting fixtures may receive the commissioning signal via the electrical wiring. In some cases, each intelligent lighting fixture that is connected to the electrical wiring, such as each intelligent lighting fixture on a lighting circuit in a room, receives the commissioning signal.

Abstract: 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 switc

Abstract: 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.

Abstract: 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; a 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

Abstract: 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.

Abstract: A method of transferring power and data between a first circuit and a second circuit is described, whereby the second circuit comprises a processing unit having an I/O terminal and an electric energy storage element, the electric energy storage element being configured to be charged by the first circuit via the I/O terminal and configured to power the processing unit, the method comprising: establishing a wired communication link between an I/O terminal of the first circuit and the I/O terminal of the second circuit; 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 via the I/O terminal of the second circuit to the I/O terminal of the first circuit by modulating an output level of the I/O terminal of the second circuit between a high level and a low level; determining whether the output level of the I/O terminal of the second circuit corresponds to the high level or the low level and, when the output leve

Abstract: 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.

Abstract: 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.

Abstract: A modular system comprising a first component comprising an LED driver and is second component comprising a light engine is described.

Abstract: 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.

Abstract: An intelligent lighting system may be installed using pre-existing electrical wiring, such as in a construction or retrofit environment. An intelligent lighting controller and an intelligent lighting fixture may be connected via electrical wiring that is configured for transmitting AC power signals. A commissioning signal may be transmitted to the intelligent lighting fixtures via the electrical wiring. In some cases, the intelligent lighting controller modifies portions of the AC power signal to indicate the commissioning signal. The intelligent lighting fixtures may receive the commissioning signal via the electrical wiring. In some cases, each intelligent lighting fixture that is connected to the electrical wiring, such as each intelligent lighting fixture on a lighting circuit in a room, receives the commissioning signal.

Abstract: 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 dur

Abstract: 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.

Abstract: 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.