Huizhou Light Engine Limited

Kwok Hung Poon

Kam Wah Siu

Wa-Hing Leung

Chung Ping Kevin Lo

A circuit for driving a light emitting diode (LED) comprises: an alternating voltage power supply, comprising a triac dimmer having a firing angle and output terminals that provide power to the LED; a zero crossing detector that detects a polarity change of the alternating voltage provided by the alternating voltage power supply and provides a zero crossing output signal indicative of the zero crossing; a timer triggered by the zero crossing output signal that generates a timer output signal during a time period of the timer; and LED power circuitry that reduces current to the light emitting diode based upon timing characteristics of the timer output signal.

Growing community of inventors

Hong Kong, China

Kwok Hung Poon