公开(公告)号：US20180069477A1

公开(公告)日：2018-03-08

申请号：US15683508

申请日：2017-08-22

Applicant: ASIAN POWER DEVICES INC.

Inventor： CHIH-YUAN HSU

IPC: H02M3/338 ,  H02M1/32 ,  H02M3/158 ,  H02M3/156 ,  H02M7/217

CPC classification number: H02M3/3385 ,  H02M1/32 ,  H02M3/156 ,  H02M3/1588 ,  H02M3/33523 ,  H02M7/217

Abstract: An overvoltage protection circuit adapted for a switching power supply is provided. The overvoltage protection circuit can use the time difference of the start of the overvoltage protection to distinguish that the overvoltage of the output voltage of the switching power supply is caused by the failure of the internal feedback or by the internal power supply, thereby avoiding a short and harmless external power supply to affect the normal operation of the switching power supply but can immediately stop the switching power supply to achieve protection when the switching power supply has an internal feedback failure.