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:
Nov. 25, 2003
Filed:
Dec. 12, 2001
Nobuaki Imamura, Omihachiman, JP;
Murata Manufacturing Co., Ltd., Kyoto, JP;
Abstract
A resonant power supply circuit includes a flyback transformer. A first FET and a power supply are connected to a primary winding of the flyback transformer. A resonant capacitor and a damper diode are connected between the drain and the source of the first FET. A clamping circuit that includes a diode and a second FET is connected in parallel to the primary winding of the flyback transformer. A control circuit controls the first FET and the second FET. After a flyback pulse is generated, the second FET is turned ON. After the second FET is turned OFF, the first FET is turned ON. When T represents a period of a ringing pulse that is generated after the second FET is turned OFF, the first FET is turned ON after a period of approximately (3T/4) elapses from the time that the second FET is turned OFF.