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:
May. 14, 2013
Filed:
Dec. 13, 2010
Jianlong Gao, Chengdu, CN;
Tiesheng Yan, Chengdu, CN;
Jianping Xu, Chengdu, CN;
O2Micro, Inc., Santa Clara, CA (US);
Abstract
An AC-to-DC converter for converting an AC voltage to a DC voltage includes a first converter, a second converter, a sense circuit, a controller, and an enabling circuit. The first converter converts an AC voltage to a first DC voltage. The second converter converts the first DC voltage to a second DC voltage. The sense circuit coupled to the first and second converters provides a first sense signal indicative of the first DC voltage and a second sense signal indicative of the AC voltage. The controller coupled to the first and second converters controls the first and second DC voltages. The enabling circuit coupled to the sense circuit generates a control signal to the controller to disable both the first converter and the second converter by comparing the first sense signal to a first threshold voltage and comparing the second sense signal to a second threshold voltage.