Search International and National Patent Collections

1. (WO2015048425) COMMUTATION CURRENT STEERING METHOD IN A ZERO VOLT SWITCHING POWER CONVERTER USING A SYNCHRONOUS RECTIFIER

Pub. No.:    WO/2015/048425    International Application No.:    PCT/US2014/057690
Publication Date: Fri Apr 03 01:59:59 CEST 2015 International Filing Date: Sat Sep 27 01:59:59 CEST 2014
IPC: H02M 3/28
H02M 7/02
Applicants: PAI CAPITAL LLC
Inventors: FENO, Ivan,
Title: COMMUTATION CURRENT STEERING METHOD IN A ZERO VOLT SWITCHING POWER CONVERTER USING A SYNCHRONOUS RECTIFIER
Abstract:
A commutation current steering method (10) is provided for a power converter having an isolation transformer, a plurality of primary ZVS switches, a plurality of secondary switches for synchronous rectification, and a boosting resonant circuit. A commutation current is shared between all of the switches, and a resonance is induced in the boosting resonant circuit by controlling each of the synchronous rectifier switches to turn off at a time prior to a turn-off time for a corresponding one of the switches operating under ZVS conditions, wherein the primary current is boosted above a minimum commutation value during ZVS periods. The ZVS switches are further driven with a constant dead time, and the synchronous rectifier switches are driven to provide a fixed time relation with respect to all of the switches.