Abstract: Devices in a wireless network, such as wirelessly networked lighting devices, utilize two different types of radios, e.g. implementing two or more protocols such as Bluetooth and WiFi. Such radios operate in overlapping frequency bands of the RF spectrum. Time Division Multiplexing (TDM) of the two types of radio operations mitigates interference between the protocols competing in the spectrum overlap. In the examples with lighting devices, a driver of the light source provides a data bus that may be used as an auxiliary communications channel to implement TDM access by the radios to the overlapping frequency bands.

Abstract: 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: an input terminal for receiving a supply voltage; 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: a sensor for measuring an electrical characteristic of the secondary circuit and; a detector configured to determine an electrical characteristic of the supply voltage based on the measured electrical characteristic of the secondary circuit.

Abstract: 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.

Abstract: Devices in a wireless network, such as wirelessly networked lighting devices, utilize two different types of radios, e.g. implementing two or more protocols such as Bluetooth and WiFi. Such radios operate in overlapping frequency bands of the RF spectrum. Time Division Multiplexing (TDM) of the two types of radio operations mitigates interference between the protocols competing in the spectrum overlap. In the examples with lighting devices, a driver of the light source provides a data bus that may be used as an auxiliary communications channel to implement TDM access by the radios to the overlapping frequency bands.

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: 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.

Abstract: 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.

Abstract: Devices in a wireless network, such as wirelessly networked lighting devices, utilize two different types of radios, e.g. implementing two or more protocols such as Bluetooth and WiFi. Such radios operate in overlapping frequency bands of the RF spectrum. Time Division Multiplexing (TDM) of the two types of radio operations mitigates interference between the protocols competing in the spectrum overlap. In the examples with lighting devices, a driver of the light source provides a data bus that may be used as an auxiliary communications channel to implement TDM access by the radios to the overlapping frequency bands.

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.

Abstract: 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.

Abstract: 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.

Abstract: 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: an input terminal for receiving a supply voltage; 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: a sensor for measuring an electrical characteristic of the secondary circuit and; a detector configured to determine an electrical characteristic of the supply voltage based on the measured electrical characteristic of the secondary circuit.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.