公开(公告)号：US09954457B2

公开(公告)日：2018-04-24

申请号：US15683508

申请日：2017-08-22

Applicant: ASIAN POWER DEVICES INC.

Inventor： Chih-Yuan Hsu

IPC: H02M1/32 ,  H02M3/338 ,  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.

公开(公告)号：US09647451B2

公开(公告)日：2017-05-09

申请号：US14802822

申请日：2015-07-17

Applicant: ASIAN POWER DEVICES INC.

Inventor： Chih-Yuan Hsu

IPC: H02H3/20 ,  H02H9/04 ,  H02M1/32

CPC classification number: H02H9/041 ,  H02M2001/322

Abstract: A discharge circuit includes a discharge switch trigger unit, a discharge switch unit and a discharge resistor unit. The discharge switch unit is coupled connected to the discharge switch trigger unit. The discharge resistor unit is coupled connected to the discharge switch unit. The discharge switch trigger unit and the discharge resistor unit are coupled connected to a voltage output side. When the output voltage of a power supply reaches a predetermined rated limitation, an over voltage protection circuit is activated, and the discharge switch unit is turned on by the discharge switch trigger unit, then the output voltage starts to decrease through the discharge resistor unit.