公开(公告)号：US11165364B2

公开(公告)日：2021-11-02

申请号：US16283845

申请日：2019-02-25

Applicant: NXP B.V.

Inventor： Fuchun Zhan ,  Tinghua Yun ,  Jian Qing ,  Chao Chen ,  Li Zhang ,  Feng Cong

IPC: H02J7/00 ,  H02M7/219 ,  H02J7/02 ,  H02M1/08 ,  H02M1/00

Abstract: A synchronous rectifier converts an AC input into a DC output. The synchronous rectifier has four switches controlled by four switch control modules. Each switch is connected between a different AC component and either the DC output or ground. Each switch control module has digitally assisted “switch on” circuitry that detects “on” bounces in the corresponding AC component to control when to turn on the corresponding switch and digitally assisted “switch off” circuitry that detects “off” bounces in the AC component to control when to turn off the corresponding switch. The “switch on” circuitry has a digitally assisted comparator to detect threshold crossings in the AC component, and the “switch off” circuitry has a digitally assisted programmable delay cell to turn off the switch for a predetermined duration following each detected threshold crossing.