Dimmable LED driver and method for controlling the same

US8947018B2 · kind B2 · utility

Assignee

• OSRAM GmbH · DE

Inventors

• Luca Bordin · Birkenfeld, DE
• Shaoping Chen · Nanhu, CN
• Yuli Chen · Tangxia, CN
• Shijun Nie · Tangxia, CN
• Wei Sin TAN · Nanhu, CN

Key dates

• Filing date: May 3, 2012
• Grant date: Feb 3, 2015
• Expiry date: May 3, 2032

Classification

• Technology area (CPC —): General

Abstract

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.