Signify Holding B.v.

Flex Ltd.

Philips Lighting Holding B.v.

Koninklijke Philips Corporation N.v.

Fujitec Co., Ltd.

Changzhou Lumixess Technology Co., Ltd

Xiao Sun

Jie Fu

Liang Shi

Minghui Dai

Jiangsong Zhang

Gang Wang

Ping Kian Bee

Harald Josef Günther Radermacher

Zhong Chen

Yu Ying Wang

Min Chen

Hiroshi Kashiwakura

Junhu Liu

Lihua Lin

Kai Qi Tian

Weifeng Chen

Keishiro Hirohata

Takuya Fujii

Kunpeng Yang

Bertrand Hohan Edward Hontele

Jimmy Jiang

A method of operating a vibrational energy harvesting system includes providing an energy harvester and an energy storage module. The energy storage module is coupled to the energy harvester to transfer energy to the energy storage module. The method also includes determining whether the energy transferred exceeds a predetermined threshold. The method further includes limiting the energy transferred to the energy storage module by a passive device when the energy transferred exceeds the predetermined threshold.

Method of energy storage in vibrational energy harvesting

A planar antenna can include one or more high permeability objects that are added near the planar coil's tips. Further, the planar antenna includes a coil having two or more layers, with each layer having two or more turns. The planar antenna also has a restricted conductor arrangement, where there are a maximum number of turns arranged in any horizontal layer. A turn's conductor could be a single conductor or could be two (2) or more conductors arranged in parallel.

Planar antenna

A driver comprising a switched mode power supply, wherein said switched mode power supply comprises an existing coil, the driver circuit further comprises: a first power transmission antenna () formed as a first coil which is either the existing coil of the switched mode power supply or coupled to the existing coil of the switched mode power supply, said first power transmission antenna () is adapted for being magnetically coupled to a second power receiving antenna () thereby forming a wireless power transmitter.

Switched mode power supply driver integrated with a power transmission antenna

An optical structure for processing the light output by a lighting unit, in which an antenna () is formed within or over an region () of the optical layer () of the structure, wherein the region () is away from the optical beam processing parts () a of the optical layer ().

Optical structure, lighting unit and a method of manufacture

A first LED driver circuit comprising: a first input interface () for receiving an AC power input and providing a first output, wherein said first output is adapted to be connected to a second LED driver circuit; a first LED driver () powered by the first output; a first shorting element () for shorting the first output; a first control arrangement () for controlling the first shorting element wherein the first control arrangement () is adapted to close the first shorting element () during only one subset of half cycles of the AC power input to short circuit the first LED driver () and to prevent the first LED driver () from being powered by the AC power input, when the second LED driver circuit is powered by the AC power input complementarily with respect to the unpowered first LED driver () and, open the first shorting element () during the other subset of half cycles to allow the AC power input to power the first LED driver (), when the second LED driver circuit is not powered by the AC power input complementarily with respect to the first LED driver (); wherein the half cycle is the positive amplitude duration or the negative amplitude duration of the AC power input This means two of the LED driver circuits may be used in series, each one is supplies by power or not complementarily based on only one subset of half cycles of the AC power input.

LED driver circuit, lighting arrangement and driving method

The invention relates to a drive unit for a lighting element and an operating method for such drive unit and to a lighting element including such drive unit. By selectively providing power to a control unit of the drive unit using different voltages at different stages of the overall drive unit, there is an additional degree of freedom which may be used for improving power efficiency, in particular for reducing standby power consumption, while still meeting specific space and cost constraints.

Drive unit for a lighting element and operating method therefor

A circuit for driving a Light-Emitting Diode (LED) light source is provided. The circuit includes a bridge rectifier, a switch unit, a current detection unit and a logic control unit. When the arcing occurs, the current detection unit detects a current signal flowing through the set of light emitting diodes; the logic control unit is adapted for generating a corresponding control signal according to the current signal, so as to control the switch unit to switch off a path from which the set of light emitting diodes receive DC power. Thus, the arcing is eliminated or suppressed, and arcing protection is achieved. Further, after the arcing protection, the LED light source can be restarted by the circuit. A LED light source is also provided. The LED light source includes the above circuit.

LED light source and circuit for driving the same

In a safety device for an elevator, on one car door among a pair of car doors, a light-emitting/light-receiving unit is disposed facing downward at an upper end position of a vertical line separated by a predetermined distance from an end face in a closing direction, which is to abut the other car door, toward the side of the other car door, and a first reflecting member is disposed facing upward at a lower end position of the vertical line. A housing space that houses the light-emitting/light-receiving unit in a state where both car doors are closed is formed on the other car door, and a second reflecting member is disposed facing upward at a bottom portion of the housing space and extends from the same position as an end face in a closing direction of the other car door toward the back of the housing space.

Safety device for elevator

A driver for providing variable power to a LED array, which can be coupled through a dimmer to an AC power supply, comprises a filtering and rectifying unit, a switching power unit, and a control unit. The filtering and rectifying unit is adapted to attenuate EMI and convert an AC power from the AC power supply into a DC power output. The switching power unit is adapted to receive the DC power output and provide an output current to the LED array. The control unit is adapted to determine the output current in response to a comparison between a dim reference signal representing phase-modulating information of the AC power and a feedback signal representing an average value of the output current. The LED array can thus be controlled by a dimmer at the primary side so as to adjust its light output, and can further be utilized in currently existing lighting infrastructures.

Driver for providing variable power to a LED array

Growing community of inventors

Shanghai, China

Xiao Sun