Commutation current steering method in a zero volt switching power converter using a synchronous rectifier
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United States of America Patent
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Dec 5, 2017
Grant Date -
Apr 2, 2015
app pub date -
Apr 1, 2014
filing date -
Sep 27, 2013
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Abstract
A commutation current steering method 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.
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