The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 23, 2012
Filed:
Aug. 20, 2010
Liangan GE, Zhejiang, CN;
Xiaoli Yao, Zhejiang, CN;
Guichao Hua, Zhejiang, CN;
Lijun Ren, Zhejiang, CN;
Liangan Ge, Zhejiang, CN;
Xiaoli Yao, Zhejiang, CN;
Guichao Hua, Zhejiang, CN;
Lijun Ren, Zhejiang, CN;
Inventronics (Hangzhou) Co., Ltd., Hangzhou, Zhejiang, CN;
Abstract
A PWM dimming circuit for a LED load including a LED load connected to the main LED drive circuit, a current loop configured to measure output current from the LED load, a current loop regulation circuit connected to the current loop, a main control circuit configured to receive a signal from the current loop when the LED load produces an output current, and a PWM dimming controller configured to provide a signal to control the current loop regulation circuit and to make the current loop operate in a closed-loop mode when the LED load produces the output current and to provide a shutdown signal to the main control circuit when the LED load does not produce the output current. When the output current is detected, the main control circuit controls the main LED drive circuit to set its output current at a predetermined load current.