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. 19, 2012
Filed:
Nov. 25, 2009
Wei-chuan Su, Hsin-Chu, TW;
Wei-Chuan Su, Hsin-Chu, TW;
Grenergy Opto, Inc., Hsin-Chu, TW;
Abstract
The present invention discloses a secondary side protection method for a switching power converter, used to turn off a secondary side switch according to a secondary side voltage signal, wherein the secondary side voltage signal has falling edges corresponding to the start instants of secondary side discharge periods, and rising edges corresponding to the end instants of the secondary side discharge periods, the method comprising the steps of: measuring the time interval between two adjacent the rising edges repeatedly to derive discharge end cycle times; and generating a first turn-off signal to turn off the secondary side switch when the relative difference of two successive the discharge end cycle times exceeds a predetermined percentage. The present invention also provides a secondary side protection apparatus according to the method.