Osram Gmbh

Osram Gesellschaft MIT Beschraenkter Haftung

Yuli Chen

Wei Tan

Shijun Nie

Shaoping Chen

Luca Bordin

Peter Sachsenweger

Jing Lin

Jin Hu

Junhua Zeng

Xuefeng Wang

Wuqiang Liao

Zhenjian Liang

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.

Dimmable LED driver and method for controlling the same

A printed circuit board (), having a front side () for population with at least one semiconductor light source () and having at least one securing element () accessible via a rear side (), wherein the at least one securing element () is embodied as an electrical through-conduction element for at least one of the semiconductor light sources.

Assembly having a semiconductor light source and support for a printed circuit board, and method for mounting the assembly

The present invention relates to a control circuit for an illuminating device, characterized in that the control circuit comprises a detecting unit, a central control unit and an illumination mode control unit, the detecting unit detects ambient brightness and generates a detection signal, the central control unit controls the illumination mode control unit, according to the detection signal, to generate a plurality of first driving signal enabling the illuminating device to operate in a first illumination mode or a plurality of second driving signal enabling the illuminating device to operate in a second illumination mode. The control circuit can automatically adjust the illuminating device to be in different operation modes according to different ambient brightness.

Control circuit and illuminating device having different operation modes

In various embodiments, a method for obtaining a conduction angle of a trailing edge dimmer is provided. The method may include determining a time point twhen the trailing edge dimmer starts to be conductive; determining an earliest time point twhen a deviation from an ideal waveform appears; and determining the conduction angle t-tof the trailing edge dimmer based on the earliest time point twhen the deviation from the ideal waveform appears and the time point twhen the trailing edge dimmer starts to be conductive.

Growing community of inventors

Shenzhen, China

Yuli Chen