公开(公告)号：US10270351B1

公开(公告)日：2019-04-23

申请号：US15920891

申请日：2018-03-14

Applicant: ASIAN POWER DEVICES INC.

Inventor： Kai-Yuan Shi ,  Hai-Ping Ding

IPC: H02M3/335

Abstract: An EMI-radiation suppression circuit is applied to a power converter having a main power switch. The EMI-radiation suppression circuit includes a control unit, a drive selection unit, and a switch unit. The drive selection unit is coupled between the control unit and the main power switch, and which provides at least two drive terminals. One drive terminal is coupled to the control unit and another drive terminal is coupled to the main power switch. The switch unit is coupled between one of the at least two drive terminals and a ground to receive a feedback control signal. When the feedback control signal activates the switch unit, the ground is coupled to the drive terminal to which the switch unit is coupled. Grounding the gate terminal suppresses the EMI and maintains operational efficiency of the power converter.