Abstract: An LED fixture comprises: —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 storagedevice for storing datain 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 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 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.

Abstract: A driver system for driving a plurality of LED includes a control module having an input for receiving operating data, and at least one driver module for driving at least one of the LED. The driver module includes a hysteretical converter for generating a current to power the LED, and a controller electrically connected to the hysteretical converter for controlling the hysteretical converter.

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 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.

Abstract: An LED driver for powering an LED fixture is described, the LED driver including a switched mode power supply for providing a current to the LED fixture, and a control unit for controlling a switch of the switched mode power supply. The control unit includes an input terminal for receiving a set point representing a desired output characteristic of the LED fixture. The control unit is further configured to periodically determine an opening instance of the switch and a closing instance of the switch, determining an average current estimate based on at least one measurement of the current to the LED fixture at least one measurement instance determined on the basis of at least one of the opening instance or the closing instance of the switch, and applying the average current estimate as a feedback signal representing the average current for controlling the LED current.

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: An interface circuit for a lighting device is described, the interface circuit comprising a single input terminal for receiving a input signal from a user interface; an output terminal for providing a control signal for controlling the lighting device, a detection circuit for receiving the input signal and identifying whether the input signal is either an analog 0-10V signal, a DALI protocol signal or a mains signal and a converter circuit for converting the input signal to the control signal based on the identification, and provide the control signal to the output terminal. The interface as described facilitates retrofitting existing lighting applications.

Abstract: 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.

Abstract: A lighting system comprising an LED assembly that comprises a first and second LED unit said LED units being serial connected is described.

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 driver circuit for driving at least one LED includes a data input for receiving set point data at a first data rate and at a first bit resolution, an LED output for driving the at least one LED with LED driving values at a second data rate and at a second bit resolution, and a processing device arranged for determining from the set point data by interpolation at least part of the LED driving values. The second data rate is higher than the first data rate, the processing device being arranged to interpolate in time.

Abstract: A driver system for driving at least one LED, the driver system includes an LED driver including a current source connected to the at least one LED for providing an LED drive current to the at least one LED, and a control module for controlling a flow of the LED drive current through the at least one LED. The driver system further includes a power supply having a power output terminal connected to a power input terminal of the current source for providing an electrical power to the current source. The control module includes a control signal output connected to a control signal input of the power supply for controlling an operation of the power supply.

Abstract: A method of retrieving status information of a lighting system includes propagating a command signal from a controller to a node of the lighting system by operating upstream transceivers that are upstream of the node in a transmitting mode and operating downstream transceivers that are upstream of the node in a receiving mode; propagating a reply signal including the status information of the LED unit of the node from the node to the controller by operating the upstream transceivers that are upstream of the node in a receiving mode and operating each of the downstream transceivers upstream of the node in a transmitting mode and reversing an operating mode of an upstream transceiver of a network segment from operating in a transmitting mode to operating in a receiving mode only when the downstream transceiver is operating in transmitting mode.

Abstract: An LED fixture comprises: -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 storagedevice for storing datain 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: An LED driver for powering an LED fixture is described, the LED driver comprising: an input terminal for receiving an input power; a power converter arranged to receive an input power at an input terminal of LED driver; convert the input power to an output power for powering the LED fixture a sensing device for sensing the input power received by the power converter; a control unit arranged to control an output characteristic of the power converter; a configuration terminal connected to the control unit; the control unit further being arranged to: receive, from the sensing device, a signal representing the sensed input power; receive, via the configuration terminal, a configuration signal representing a maximum wattage for the LED driver; and control the output characteristic of the power converter such that the input power as sensed does not exceed the maximum wattage.

Abstract: A driver system for driving at least one LED, the driver system includes an LED driver including a current source connected to the at least one LED for providing an LED drive current to the at least one LED, and a control module for controlling a flow of the LED drive current through the at least one LED. The driver system further includes a power supply having a power output terminal connected to a power input terminal of the current source for providing an electrical power to the current source. The control module includes a control signal output connected to a control signal input of the power supply for controlling an operation of the power supply.

Abstract: A method of retrieving status information of a lighting system includes propagating a command signal from a controller to a node of the lighting system by operating upstream transceivers that are upstream of the node in a transmitting mode and operating downstream transceivers that are upstream of the node in a receiving mode; propagating a reply signal including the status information of the LED unit of the node from the node to the controller by operating the upstream transceivers that are upstream of the node in a receiving mode and operating each of the downstream transceivers upstream of the node in a transmitting mode and reversing an operating mode of an upstream transceiver of a network segment from operating in a transmitting mode to operating in a receiving mode only when the downstream transceiver is operating in transmitting mode.