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. 12, 2012
Filed:
Aug. 13, 2009
Masaaki Shimada, Niiza, JP;
Masaaki Shimada, Niiza, JP;
Sanken Electric Co., Ltd., Niiza-shi, JP;
Abstract
A switching power source apparatus has a controller generating a drive signal that controls an ON/OFF period of a switching element. The controller includes a load tester for testing the switching power source apparatus when detecting an edge of the drive signal after the switching element is switched from ON to OFF, a bottom detector of the switching element during an OFF period thereof, a bottom skip state tester, and a bottom skip operation tester carrying out a pseudo resonant operation that turns on the switching element at a first minimum voltage point if the apparatus is in a heavy load state, and if the apparatus is in the light load state and if the bottom skip state has continued for a first predetermined time, shift the pseudo resonant operation to a bottom skip operation.