Synchronous rectifier self gate drive for zero voltage switching power conversion circuits
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United States of America Patent
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Nov 18, 2003
Grant Date -
Aug 14, 2003
app pub date -
May 28, 2002
filing date -
Feb 12, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Synchronous rectifier self drive mechanisms are revealed which are universally applicable to zero voltage switching power converters which rely on an auxiliary inductor to drive the critical turn on transition of the main switch of the power converter. The voltage wave form generated by the auxiliary inductor is well suited to synchronous rectifier self drive. Voltage limiting circuits that reduce the voltage swing of synchronous rectifier gates are also revealed. These voltage limiting circuits reduce the energy circulated into and out of the synchronous rectifier gates and protect the synchronous rectifier gate circuits from negative over voltage.
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