Abstract: A driver for driving a load, wherein the driver comprises a dual-boost converter comprising an output capacitance comprising a first output capacitor connected in series with a second output capacitor, a first switch connected to a power input stage via a first inductor and arranged for controlling charging of said first output capacitor via a first diode and a second switch, connected in series with said first switch, and connected to the power input stage via a second inductor and arranged for controlling charging of said second output capacitor via a second diode; wherein a centre tap of said in series connected first and second output capacitor is connected to a centre tap of said in series connected first and second switch.

Abstract: A Digital Addressable Lighting Interface, DALI, enabled communication device for transmitting messages over a communication bus having two communication lines, said device comprising a switch connected between said two communication lines, a controller arranged for controlling said switch for imposing logical communication levels on said communication bus, an energy storage device, connected in series with said switch, and arranged for storing electrical energy flowing from said bus through said switch, a bypass circuit arranged for bypassing said energy storage device when a voltage over said energy storage device is above a predetermined voltage threshold.

Abstract: The invention relates to a lighting apparatus for coupling to an LED driver. The lighting apparatus comprises a plurality of LEDs in a series connection arranged to form an LED string having a first end and a second end, a heatsink thermally coupled to the LED string, wherein the heatsink is electrically conductive, a capacitor coupled between the first end of the LED string and the heatsink and an electrical connection between the second end of the LED string and the heatsink.

Abstract: A lighting circuit comprises a first light source arrangement and a second light source arrangement, of different types, in series. A driver delivers a controllable current to the light source circuit, with an adjustable DC component and an adjustable modulated component, for example an adjustable duty cycle of a superposed pulse width modulated component. This enables control of the contributions to the overall light output flux from the different types of light source.

Abstract: A Light Emitting Diode, LED, based lighting device arranged to emit colored light, wherein said LED based lighting device comprises a first LED channel comprising at least one LED arranged for emitting light at a first color, a second LED channel comprising at least one LED arranged for emitting light at a second color, said second color being different to said first color, a controller arranged for activating said first LED channel and said second LED channel based on a color ratio such that said LED based lighting device emits light having a particular color, wherein said controller is further arranged for correcting said color ratio based on aging of said at least one LED in said first LED channel and on said at least one LED in said second LED channel, thereby ensuring color consistency of said particular color of said LED based lighting device over time.

Abstract: The invention relates to a lighting apparatus for coupling to an LED driver. The lighting apparatus comprises a plurality of LEDs in a series connection arranged to form an LED string having a first end and a second end, a heatsink thermally coupled to the LED string, wherein the heatsink is electrically conductive, a capacitor coupled between the first end of the LED string and the heatsink and an electrical connection between the second end of the LED string and the heatsink.

Abstract: The invention relates to a lighting unit comprising a power converter for providing a regulated power to a first LED load where the first LED load comprises at least one LED, wherein the first LED load is coupled to the power converter, a series combination of a first capacitor and a first switch coupled in series with each other, wherein the series combination is coupled in parallel with the LED load, wherein the power converter is arranged to operate in a first mode, provide a first amount of the regulated power to the first LED load, and wherein the first switch is closed, and in a second mode, provide a second amount of the regulated power to the first LED load, wherein the second amount of the regulated power to the first LED load is lower than the first amount of the regulated power to the first LED load, and wherein the first switch is opened.

Abstract: A driver for driving a load, wherein the driver comprises a dual-boost converter comprising an output capacitance comprising a first output capacitor connected in series with a second output capacitor, a first switch connected to a power input stage via a first inductor and arranged for controlling charging of said first output capacitor via a first diode and a second switch, connected in series with said first switch, and connected to the power input stage via a second inductor and arranged for controlling charging of said second output capacitor via a second diode; wherein a centre tap of said in series connected first and second output capacitor is connected to a centre tap of said in series connected first and second switch.

Abstract: A mechanism for performing a communication using a visible light communication (VLC) protocol. The mechanism proposes to modulate a bus voltage provided to all lighting elements (comprising LED elements) of a lighting unit, so that the magnitude of light emitted by all lighting elements is modulated according to a same modulation scheme. A lighting system having a plurality of lighting elements is also proposed.

Abstract: The invention relates to a lighting system comprising a load comprising a parallel configuration of a first LED load having a first forward voltage, and a first switch coupled in series with the first LED load; and a second LED load, having a second forward voltage being different than the first forward voltage; a switched mode power supply comprising a switching element; an inductor; a diode; a set of output pins for coupling to the load; and a capacitor coupled across the set of output pins; wherein the switched mode power supply is arranged to provide a voltage across the set of output pins, wherein the lighting system comprises a further inductor coupled between the one of the output pins and the load.

Abstract: A circuit comprises a first printed circuit board (60) carrying a first set of components and a second printed circuit board (62) carrying a second set of components, with a clearance (64) between the first and second printed circuit boards. A transformer (66) has a primary side connected to the first set of components and a secondary side connected to the second set of components. One of the transformer windings, and its connection to a respective set of components, comprises a triple insulated wire. A glass, ceramic or mica spacer (70) mounted to the first and second printed circuit boards defines and sets the clearance (64) between the first and second printed circuit boards. The clearance requirement is met by providing separate printed circuit boards with spacing between them and the use of a triple insulated wire addresses or overcomes issues of creepage. Thus, high frequency and high voltage operation on the first printed circuit board is possible.

Abstract: A power supply for an LED lighting unit. The power supply comprises two power converters, either of which may provide the power to be drawn by components of the LED lighting unit. In particular, a controller of the power supply controls which power converter converts a mains power supply to a power level for a connected LED lighting unit. The two power converters are designed to be efficient when providing different power levels.

Abstract: A Light Emitting Diode, LED, based lighting device arranged to emit colored light, wherein said LED based lighting device comprises a first LED channel comprising at least one LED arranged for emitting light at a first color, a second LED channel comprising at least one LED arranged for emitting light at a second color, said second color being different to said first color, a controller arranged for activating said first LED channel and said second LED channel based on a color ratio such that said LED based lighting device emits light having a particular color, wherein said controller is further arranged for correcting said color ratio based on aging of said at least one LED in said first LED channel and on said at least one LED in said second LED channel, thereby ensuring color consistency of said particular color of said LED based lighting device over time.

Abstract: The invention relates to a lighting system comprising a load comprising a parallel configuration of a first LED load having a first forward voltage, and a first switch coupled in series with the first LED load; and a second LED load, having a second forward voltage being different than the first forward voltage; a switched mode power supply comprising a switching element; an inductor; a diode; a set of output pins for coupling to the load; and a capacitor coupled across the set of output pins; wherein the switched mode power supply is arranged to provide a voltage across the set of output pins, wherein the lighting system comprises a further inductor coupled between the one of the output pins and the load.

Abstract: A LED driver comprises two output contacts (310, 311) and an additional contact (312) which enables detection of connection of the LED driver to a LED module (301). The LED driver has a normal current regulating mode and an open circuit protection voltage regulating mode. The LED driver is switched from the voltage regulating mode to the current regulating mode in response to the detection of connection of the LED module. This enables a LED module to be connected to the LED driver while it remains powered, in particular because the LED driver is placed in a voltage regulating mode prior to connection to the LED module.

Abstract: A Digital Addressable Lighting Interface, DALI, enabled communication device for transmitting messages over a communication bus having two communication lines, said device comprising a switch connected between said two communication lines, a controller arranged for controlling said switch for imposing logical communication levels on said communication bus, an energy storage device, connected in series with said switch, and arranged for storing electrical energy flowing from said bus through said switch, a bypass circuit arranged for bypassing said energy storage device when a voltage over said energy storage device is above a predetermined voltage threshold.

Abstract: A power supply for an LED lighting unit. The power supply comprises two power converters, either of which may provide the power to be drawn by components of the LED lighting unit. In particular, a controller of the power supply controls which power converter converts a mains power supply to a power level for a connected LED lighting unit. The two power converters are designed to be efficient when providing different power levels.

Abstract: A LED driver comprises two output contacts (310, 311) and an additional contact (312) which enables detection of connection of the LED driver to a LED module (301). The LED driver has a normal current regulating mode and an open circuit protection voltage regulating mode. The LED driver is switched from the voltage regulating mode to the current regulating mode in response to the detection of connection of the LED module. This enables a LED module to be connected to the LED driver while it remains powered, in particular because the LED driver is placed in a voltage regulating mode prior to connection to the LED module.

Abstract: The present invention relates to a frame (100) for supporting a light guide panel (120). The frame (100) being provided with: a solid state light source (102) connected to and arranged on a circuit board (104), the circuit board (104) comprising an electrically insulating outer perimeter portion (104a); an insulation layer (106) being electrically insulating, the insulation layer (106) having a surface area larger than a surface area of the circuit board (104); wherein the insulation layer (106) is arranged on the frame (100); the circuit board (104) is arranged on the insulation layer (106) such that an insulating outer perimeter portion (106a) of the insulation layer (106) is formed outside of the circuit board (106); thereby providing a double insulation of the solid state light source (102) in relation to the frame (100). The invention also relates to a luminaire (130) comprising the frame (100).

Abstract: There is provided a light module having a housing, a first circuit board arranged in the housing and comprising a central through hole, a front side on which driver electronics through-hole components are mounted, and a back side from which leads of the driver electronics through-hole components protrude, wherein a gap behind the first circuit board accommodates the leads, and a second circuit board electrically connected to the first circuit board and comprising at least one solid-state lighting element adapted to emit light, wherein the second circuit board is arranged in level with the first circuit board or in a plane behind the first circuit board.