Huizhou Light Engine Limited

Siu Hong Wong

Wa Hing Leung

Kam Wah Siu

Bo Tian

An LED lighting circuit where the configuration of the connection of two or more LEDs are changed from parallel to series through the use of solid state switches depending on whether the voltage level from an AC source measured by a voltage detector exceeds the sum of the forward voltages of the LEDs. Also, a method of activating LEDs in an LED array lighting apparatus involving applying a rectified alternating current to two or more LEDs, each LED having a forward bias voltage; comparing the rectified alternating current to the sum of the forward bias voltages of the two or more LEDs; and changing the circuit configuration of the two or more LEDs between a parallel connection and a series connection with respect to the rectified alternating current depending on whether the rectified alternating current exceeds the sum of the forward bias voltages of the two or more LEDs.

AC LED array configuration switching circuit triggered by source voltage level

A device and method for reducing current ripple to a light emitting diode array having a single stage power factor correction driver with an output voltage ripple that is reduced by using a linear current regulator connected in series between the single stage power factor correction driver and the light emitting diode array, which actively adjusts an equivalent impedance of the linear current regulator in correspondence with the output voltage ripple of the single stage power factor correction driver.

Growing community of inventors

Hong Kong, China

Siu Hong Wong