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:
Mar. 10, 2020
Filed:
Dec. 03, 2014
Shanghai Yaming Lighting Co., Ltd., Shanghai, CN;
Kryger De Jozef, Shanghai, CN;
Xiaoliang Xu, Shanghai, CN;
SHANGHAI YAMING LIGHTING CO., LTD., Malu Town, Jiading District, Shanghai, CN;
Abstract
An alternating-current LED drive circuit, comprising a plurality of LED strings connected between an alternating-current voltage source and a ground, any one of the LED strings being correspondingly provided with a conversion switch and one or more LED light sources being connected in series in any one of the LED strings; a voltage detection unit used for detecting a voltage root mean square value of an alternating-current power supply signal in the connected alternating-current voltage source; and a switching logic control unit used for outputting, according to a voltage interval into which the voltage root mean square value detected by the voltage detection unit falls, a conversion control signal corresponding to the voltage interval to each conversion switch to corresponding to each LED string respectively control each conversion switch to perform a corresponding conversion action, the conversion action of each conversion switch enabling all LED strings to be connected in series or in parallel to adapt to the alternating-current voltage source.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile