Abstract: The present invention relates to a power control unit (40; 60) for controlling electrical power provided to a load (12), Min particular an LED unit (12) comprising one or more LEDs, said driver device comprising a converter unit (10) having an input terminal (42) for receiving an input voltage (V10) from an external power supply (22) and having an output terminal (44) for providing an output voltage (V14) to power the load (12), wherein the converter unit (10) comprises a switching device (14) for transforming the input voltage (V10) to the output voltage (V14), a control unit (20) for controlling the switching device (14), signal means (46; 62) connected to the output terminal (44) for applying a voltage or current signal to the output terminal (44), wherein the control unit (20) is connected to the signal means (46; 62) and adapted to control the signal means (46; 62).

Abstract: The invention relates to a power supply system and a method for providing a load (L) with electrical power from either a first or a second AC grid source (10L, 10H) that supply different first and second AC voltages, respectively. In a particular example, said grid sources may belong to the US and the European mains, respectively, and the load may be a lamp with mains compatible LEDs (Ch1-Ch4). The power supply system comprises a first and a second connector device (30L, 30H) for connecting a converter circuit (20) to the first or the second AC grid source (10L, 10H), respectively. Moreover, the second connector device (30H) comprises a transformation circuit (D1-D4) for transforming the second AC voltage such that it yields a similar output voltage of the converter circuit (20) as the first AC voltage.

Abstract: The present invention relates to a driver device and a corresponding driving method for driving a load (22), in particular an LED unit, said driver device comprising power input terminals (51, 52) for receiving a periodic supply voltage from an external power supply potentially including a dimmer for dimming said periodic supply voltage,power output terminals (53, 54) for providing a drive voltage and/or drive current for driving a load (22), a power stage (70a, 70b, 70c, 70d) coupled between the power input terminals and the power output terminals for controlling an input current received from said power input terminals to draw a high power from said external power supply in a first mode or to draw a low or no power from said external power supply in a second mode, said high power being higher than the power required for driving said load and said low power being lower than the power required for driving said load, wherein said power stage controls said input current to be in the second mode only for a perce

Abstract: A power interface is proposed, which keeps an adjustable power supply circuit in a conducting state even if the average current consumption of an attached load is below the adjustable power supply circuit's holding current requirement. The power interface makes use of the dynamic properties of adjustable power supply circuits. Due to the recovery time of the adjustable power supply circuit, it will stay in the conducting state even if there is no current flowing for a short while. The power interface makes use of this effect by interrupting and re-establishing a current flow from the adjustable power supply circuit.

Abstract: The invention relates to a light emitting system (100), the system comprising a light emitting diode (104), a socket adapter for retrofitting a fluorescent lamp and an electric circuit (112; 200; 306), the electric circuit (112; 200; 306) being adapted for emulating the presence of a fluorescent lamp to a fluorescent lamp driver (102).

Abstract: Driver device and a corresponding driving method for driving a load, in particular an LED assembly comprising one or more LEDs. To provide a better performance, better cost-efficiency, improved power factor and reduced losses, a driver device (1,1?, 2, 2?) is provided comprising a rectifier unit (10) for rectifying a received AC supply voltage (VS), load terminals (20) for providing a drive voltage (VL) and/or a drive current (IL) for driving said load, a capacitive storage unit (30) coupled between said rectifier unit and said load terminals for storing electrical energy provided by said rectifier unit and providing electrical energy to said load, and a bridge switching unit (40) coupled between said rectifier unit and said load for switching said capacitive storage unit into a load current path from said rectifier unit to said load terminals with a desired polarity and for switching said capacitive storage unit out of said load current path.

Abstract: In a circuit (1) for sensing a property of light there are provided a first circuit element (7) that is sensitive to light and that is realized to generate an output signal (I1) during a measurement time period (?tM), wherein the output signal (I1) is generated according to light to which the first circuit element (7) is exposed and the temperature (T) of the first circuit element (7), and a second circuit element (8) that is realized to increase the temperature (T) of the first circuit element (7) during a warming time period (?tW) that precedes the measurement time period (?tM).

Abstract: Driver device (1) and a corresponding driving method for driving a load (100), in particular an LED assembly comprising two or more LEDs.

Abstract: Disclosed are methods and systems for controlling of a lighting system with a plurality of light sources, particularly to the semi-automatic commissioning of light sources of the lighting system or controlling of the creation of lighting scenes with the lighting system. A spatial coding of light is used for controlling a lighting system, particularly for commissioning of light sources of the lighting system. Some exemplary systems for controlling a lighting system with a plurality of light sources, include a light system controller for controlling the light sources to create a spatial light pattern coding one or more attributes of the light sources, and a light pattern capturing device comprising a scanner for capturing the created spatial light pattern and a communication unit for communicating with the light system controller in order to enable the controlling of the one or more light sources based on the captured spatial light pattern.

Abstract: What is described is a lighting unit 10 with a plurality of lighting segments 30a, 30b. The lighting segments 30a, 30b are arranged on a strip 40 in spaced relation from each other. Each lighting segment 30a, 30b is connected to an electrical supply terminal 20. In order to obtain a lighting unit with a flexible electrical configuration, each lighting segment 30a, 30b comprises at least one LED element and at least one driver circuit 36 including a controllable, current limiting element for controlling a current through the LED element.

Abstract: A device for controlling current to a solid state lighting load includes a capacitor (241, 341) and a current source (245, 345). The capacitor is connected in a parallel arrangement with the solid state lighting load (260, 360). The current source is connected in series with the parallel arrangement of the capacitor and the solid state lighting load. The current source is configured to modulate dynamically an amplitude of an input current provided to the parallel arrangement of the capacitor and the solid state lighting load based on an input voltage.

Abstract: An input stage (10) of an apparatus (1) for driving a light-emitting diode (40-42) receives a signal from a power supply (30-32), and an output stage (20) supplies a current to the light-emitting diode (40-42). The peak value divided by the average value of the current forms a ratio. The driving efficiency is improved by providing the input stage (10) with an arrangement (11) for reducing this ratio by manipulation of the signal, without the necessity of using any smoothing capacitors/inductors. The manipulation may comprise an addition of a frequency component to the signal or an adaptation of an amplitude of a frequency component of the signal. This frequency component may be a third and/or fifth and/or seventh harmonic frequency component of a fundamental frequency component of the signal. The arrangement (11) may comprise a resonant tank which may need to be tuned to the frequency component of the signal.

Abstract: The present invention relates to an LED lamp (1) adapted for operation with an alternating current. The LED retrofit lamp (1) comprises a LED unit (7, 7?, 7?, 7??) and a compensation circuit with a controllable switching device (9, 9?), connected parallel to said LED unit (7, 7?, 7?, 7??) to provide an alternate current path. A control unit (10, 10?, 10?) is adapted to control said switching device (9, 9?) in a compensation mode in which said switching device (9, 9?) is set to the conducting state for the duration of a shunt period in each half cycle of the alternating current to allow adapting the power/current of the inventive LED lamp (1), so that a versatile and optimized operation of the lamp (1) is possible.

Abstract: The invention relates to a LED circuit arrangement (1) with at least a voltage input (4), adapted to provide an operating voltage, a reactive element (6) connected in series with said voltage input (4) and a LED light source (3). To enable the LED circuit arrangement (1) to be driven at an operating voltage, the LED light source (3) comprises a first and a second LED unit (8, 9), each having one light emitting diode, controllable switching means (10) to connect said LED units (8, 9) with said reactive element (6) in a low voltage mode and a high voltage mode and a control unit (12). The LED light source (3) shows a first forward voltage in said low voltage mode and a second forward voltage in said high voltage mode, said second forward voltage being higher than said first forward voltage.

Abstract: A light generating device (20) comprises: —an input for receiving a DC input voltage (Vin) of varying magnitude; —a controllable current source (40); —a switch matrix (30) comprising a plurality of controllable switches (S1-SN); —a plurality of n LEDs (D1, D2, . . . Dn) connected to output terminals of the switch matrix (30); —a controller (50) controlling said switches and controlling the current generated by the current source dependent on the momentary value of the DC input voltage (Vin). The controller is capable of operating in at least three different control states. In a first control state all LEDs are connected in parallel. In a second control state all LEDs are connected in series. In a third control state at least two of said LEDs are connected in parallel while also at least two of said LEDs are connected in series.

Abstract: Devices (1) have branches (20,30) for receiving AC voltages. First branches (20) comprise first light-emitting diode circuits (21) and first arrangements for phase-shifting first currents flowing through the first light-emitting diode circuits (21) with respect to the AC voltages. Second branches (30) comprise second light-emitting diode circuits (31) and do not comprise second arrangements for phase-shifting second currents flowing through the second light-emitting diode circuits (31) with respect to the AC voltages. As a result, an overall flicker index of the device (1) will be smaller than individual flicker indices of the light-emitting diode circuits (21,31). The first arrangements may comprise capacitors (22) coupled serially to the first light-emitting diode circuits (21). The branches (20,30) may further comprise resistors (23,33) coupled serially to or forming part of the light-emitting diode circuits (21,31).

Abstract: A Power-over-Ethernet (PoE) device (200) for use in a PoE system is described. The PoE device (200) comprising a first PoE port (210) for connecting the device to an upstream PoE device or a central control unit, a second PoE port (220) for connecting the device to a downstream device or PoE device and a control unit (240) for controlling data (335) and/or power communication (400) between the first (210) and second (220) PoE port. The control unit (240) further comprises a first power input terminal (305) connected to the first PoE port (210) to receive electrical power (320) for powering the control unit (240).

Abstract: This invention relates to a lighting device comprising a light transmissive light outlet unit (102), and light emitting diodes (104) generating light which is emitted through the light outlet unit. The lighting device further comprises a conductive layer structure (114), which is arranged as a coating on a portion of an inner surface of the light outlet unit. The light emitting diodes are mounted on and electrically connected with the conductive layer structure.

Abstract: The invention relates to lighting devices (100) for producing ultimate light comprising first light of a relatively warm color and second light of a relatively cool color. The lighting devices (100) comprise first and second circuits (1, 2) for producing the first and second light, third circuits (3) for reaching a temperature per intensity state of the ultimate light, and fourth circuits (4) thermally coupled to the third circuits (3) and comprising temperature-dependent circuits for giving the ultimate light a, for example, relatively warm color at lower intensity states and for giving the ultimate light a, for example, relatively cool color at higher intensity states.

Abstract: The invention describes an AC-LED lighting circuit (1) comprising an AC-LED arrangement (10) with at least a first set (11) of LEDs connected according to a first polarity and a second set (12) of LEDs connected according to the opposite polarity, which AC-LED lighting circuit (1) is characterized by (i) a source (61) of a polarity-selectable DC input signal (51) to be applied to the AC-LED arrangement (10), or a connecting means (40) for connecting the AC-LED lighting circuit (1) to a fixed-polarity DC input signal (50) and a conversion means (T1, T2, T3, T4) for converting the fixed-polarity DC input signal (50) to a polarity-selectable DC signal (50?) to be applied to the AC-LED arrangement (10); and (ii) a polarity controller (70, 71) realized to control the polarity of the polarity-selectable DC signal (50?, 51) applied to the AC-LED arrangement (10) such that the first set (11) of LEDs of the AC-LED arrangement (10) is driven when the polarity-selectable DC signal (50?, 51) has the first polarity, and t