SYNCHRONOUS RECTIFICATION CIRCUIT AND ASSOCIATED ZERO-CROSSING DETECTION METHOD
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United States of America Patent
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Issued Date -
Nov 14, 2013
app pub date -
May 10, 2013
filing date -
May 10, 2012
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Abandoned
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Abstract
The embodiments of the present invention disclose a synchronous rectification circuit and associated zero-crossing detection method. The synchronous rectification circuit includes a synchronous rectifier having a source, a drain, and at least two gates. The synchronous rectifier having N MOS cells connected in parallel, wherein N is an integer greater than or equal to 2. Through comparing a voltage signal across the drain and the source of the synchronous rectifier with a first and a second threshold voltage, part of the N MOS cells is turned off once the voltage signal is equal to the first threshold voltage, and the left part of the N MOS cells is turned off once the voltage signal is equal to the second threshold voltage. Thus, the accuracy of zero-crossing detection is improved.
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