Osram Gmbh

Luca Bordin

Wei Tan

Yuli Chen

Shijun Nie

Shaoping Chen

Wuqiang Liao

An LED control circuit for controlling an LED illuminating device is disclosed. The LED illuminating device includes at least serially connected load group, and the LED control circuit includes: a conversion module configured to convert an input voltage to an output voltage, and to output a working current as a sample current; a reference voltage generating module configured to generate a reference voltage; a control module configured to compare a sample voltage corresponding to the sample current with the reference voltage, and to output a control signal to the conversion module according to a comparison result; and a load short circuit module including a plurality of switches each connected in parallel with respective load group for performing a short circuit control on respective load group in response to a switching signal. A controlling method of such LED control circuit is also disclosed.

LED control circuit and a controlling method of the same

A dimmable LED driver adapted to be operated with a dimmer that is configured to generate a predetermined conductive angle, wherein the dimmable LED driver comprises: a rectifier configured to convert an alternating current output by the dimmer to a direct current, a buck PFC block configured to adjust an output voltage of the direct current so as to obtain a stable output voltage, a second buck DC/DC block configured to realize output of a constant current after the stable output voltage is realized, a dimming block configured to, after realizing output of the constant current, accomplish a dimming function jointly with the second buck DC/DC block, and an MCU configured to control the buck PFC block, the second buck DC/DC block and the dimming block.

Growing community of inventors

Munich, Germany

Luca Bordin