Predictive threshold synchronous rectifier control

Details Predictive threshold synchronous rectifier control Predictive threshold synchronous rectifier control

Filed on

1998-06-04

Date issued

2000-08-08

Examiner

Sterrett, Jeffrey

Patent Class

Electric power conversion systems

SubClass

Current conversion

SubSubClass

Including d.c.-a.c.-d.c. converter

Other Related Categories

363 89, 363127, H02M 7217

Type

Patent

Status

active

Patent number

061011045

Description

ABSTRACT:
A method and apparatus are disclosed for controlling the operation of a synchronous rectifier used in power conversion circuitry. The disclosed method and apparatus senses the voltage across the synchronous rectifier, and turns the synchronous rectifier OFF when the voltage across the rectifier is about to change direction. Preferably, the synchronous rectifier is commanded OFF at the approximate instant when the voltage across the rectifier reaches approximately zero, which also corresponds to a current of approximately zero. Accordingly, currents are prevented from flowing in the reverse direction in the synchronous rectifier. This results in approximately zero voltage and zero current switching when the rectifier is turned OFF, thereby minimizing switching losses.

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patent: 5430640 (1995-07-01), Lee
patent: 5528480 (1996-06-01), Kikinis et al.
patent: 5734563 (1998-03-01), Shinada
patent: 5742491 (1998-04-01), Bowman et al.
patent: 5774350 (1998-06-01), Notaro et al.
patent: 5818704 (1998-10-01), Martinez
patent: 5841641 (1998-11-01), Faulk
patent: 5870299 (1999-02-01), Rozman

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