LED driver circuit for supplying TRIAC holding current by using controllable current source

Patent metadata

Field	Value
Publication number	US-9198243-B2
Application number	US-201414200309-A
Country	US
Kind code	B2
Filing date	Mar 7, 2014
Priority date	Dec 17, 2013
Publication date	Nov 24, 2015
Grant date	Nov 24, 2015

Abstract

An LED driver circuit for supplying a TRIAC holding current by using a controllable current source has a single-stage power factor correction circuit architecture, and the circuit receives an input voltage received by a conversion module of the controllable current source to form an operating current for driving an LED light source to emit light and monitoring the change of the input voltage by a control chip, and adopts a switching method of a fixed cut-off time of a switch unit, so that the controllable current source outputs a constant operating current in a standard peak value to achieve the constant current status during the operation of the LED light source while assuring the operating current is always greater than a holding current required by the TRIAC element when the TRIAC element is conducted.

First claim

What is claimed is:

1. An LED driver circuit for supplying a TRIAC holding current by using a controllable current source, being a single-stage power factor correction circuit architecture, comprising:
a dimming module;
a rectification module;
a conversion module; and
a control module, comprising a control chip,
wherein the dimming module comprises a TRIAC element, and the rectification module is electrically coupled to the dimming module and the conversion module, and the…

Assignees

• Unity Opto Technology Co Ltd

Inventors

• Wu Chih-Hsien
• Chang Wei
• Chuang Kai-Cheng
• Chiu Shao-Wei

Classifications

• H05B33/0815 Primary

  Electricity · mapped topic

• H05B33/0845

  Electricity · mapped topic

• Y02B20/347

  Cross-Sectional Technologies · mapped topic

• H05B45/3725

  Electricity · mapped topic

• H05B45/10 Primary

  Electricity · mapped topic