公开(公告)号：US20200266720A1

公开(公告)日：2020-08-20

申请号：US16865762

申请日：2020-05-04

Applicant: Futurewei Technologies, Inc.

Inventor： Yushan Li ,  Liming Ye ,  Heping Dai

IPC: H02M3/335 ,  H02M1/08 ,  H02M1/40

Abstract: An apparatus includes a pulse-width modulation (PWM) generator configured to generate a PWM signal for controlling a power switch of a power converter, a bias switch and a bias capacitor connected in series and coupled to a magnetic winding of the power converter and a comparator having a first input connected to the bias capacitor, a second input connected to a predetermined reference and an output configured to generate a signal for controlling the bias switch to allow a magnetizing current from the magnetic winding to charge the bias capacitor when a voltage across the bias capacitor is less than the predetermined reference.

公开(公告)号：US20190044449A1

公开(公告)日：2019-02-07

申请号：US15819209

申请日：2017-11-21

Applicant: Futurewei Technologies, Inc.

Inventor： Yushan Li ,  Liming Ye ,  Heping Dai

IPC: H02M3/335 ,  H02M1/08

Abstract: An apparatus includes a pulse-width modulation (PWM) generator configured to generate a PWM signal for controlling a power switch of a power converter, a bias switch and a bias capacitor connected in series and coupled to a magnetic winding of the power converter and a comparator having a first input connected to the bias capacitor, a second input connected to a predetermined reference and an output configured to generate a signal for controlling the bias switch to allow a magnetizing current from the magnetic winding to charge the bias capacitor when a voltage across the bias capacitor is less than the predetermined reference.