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:
Sep. 26, 2017
Filed:
Aug. 22, 2014
Sichuan Sunfor Light Co., Ltd., Sichuan, CN;
Mian Yang, Sichuan, CN;
Zhengyong Feng, Sichuan, CN;
Wentao Long, Sichuan, CN;
Dongming Li, Sichuan, CN;
SICHUAN SUNFOR LIGHT CO., LTD, Sichuan, CN;
Abstract
An LED AC drive circuit, comprising: a rectification unit, a current-limiting unit, M LED units and M−1 connected/disconnected control connection lines; each LED unit comprising ni LEDs connected in series, wherein 1≦i≦M, and n1+n2+ . . . +nM=N, 1≦M≦N, and N is determined by formula (I). The M LED units are connected sequentially to the positive end of the rectification unit and to the current-limiting unit connected to the negative end of the rectification unit; the first LED unit comprises switches connected in series at the negative end of the LED string; the ith LED unit comprises switches connected in series at the positive end of the LED string and switches connected in series at the negative end of the LED string, wherein 1≦i≦M−1; and the Mth LED unit comprises switches connected in series at the positive end of the LED string.