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:
Jun. 06, 2000
Filed:
Apr. 09, 1999
Sony Corporation, Tokyo, JP;
Abstract
In a switching power source, by alternately turning on the first and second MOS transistors, a resonance current flows to a primary winding of a transformer, and an alternate current is transmitted to a secondary side. With respect to an alternate signal generated in a secondary winding, a gate voltage is applied so that the third MOS transistor and the fourth MOS transistor are conductive, respectively, while the polarity of the alternate signal is positive. Rectifying currents are flowed to a capacitor and a full-wave rectification is executed. Since a control signal for synchronous control is supplied from a signal source to control the first and second switching elements via transformers, a switching timing can be accurately coincided with an on/off timing of a synchronous rectifying device by a simple circuit. The efficiency of a current resonance type switching power source is thus improved.