公开(公告)号：US10826468B1

公开(公告)日：2020-11-03

申请号：US16718846

申请日：2019-12-18

Applicant: ASIAN POWER DEVICES INC.

Inventor： Ganghong Liu ,  Wei Tang

IPC: H02M1/15 ,  H02M1/34 ,  H02M3/00 ,  H02M3/335 ,  H03K3/30 ,  H02J3/24

Abstract: An active damping circuit of dead time oscillation includes a damping unit, a main switch, a voltage biased unit, an auxiliary switch, and a voltage determining unit. The main switch is coupled to the damping unit. The voltage biased unit is coupled to the damping unit and the main switch, and the voltage biased unit provides a drive voltage to the main switch. The auxiliary switch is coupled to the voltage biased unit. The voltage determining unit is coupled to the auxiliary switch, the voltage biased unit, and the damping unit, and the voltage determining unit provides a threshold voltage. When a voltage across two ends of a winding of a transformer is less than the threshold voltage, the auxiliary switch is turned off so that the drive voltage turns on the main switch and enable the damping unit to suppress the dead time oscillation.