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. 22, 2011
Filed:
Apr. 03, 2009
Jie-jian Zheng, Shenzhen, CN;
Tong Zhou, Shenzhen, CN;
Jie-Jian Zheng, Shenzhen, CN;
Tong Zhou, Shenzhen, CN;
Innocom Technology (Shenzhen) Co., Ltd., Shenzhen, Guangdong Province, CN;
Chimel Innolux Corporation, Miao-Li County, TW;
Abstract
A switching power supply circuit includes a direct current (DC) power supply input terminal, a first transformer including a first primary winding, a second transformer, and a pulse generating circuit, and a startup circuit. The pulse generating circuit includes first and second first switching units connected in series and two voltage division resistors connected in series between the DC power supply input terminal and ground, and two capacitors connected in parallel with one of the two voltage division resistors. The second transformer includes a second primary winding connected between control terminal and second conducting terminal of the first switching unit, a second secondary winding; and an assistant winding connected between the control terminal of the second switching unit and ground. The second conducting terminal of the first switching unit is grounded via the second secondary winding, the first primary winding and a capacitor in series.