Method of controlling synchronous rectifier metal-oxide-semiconductor with pulse transformer
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United States of America Patent
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Jan 16, 2018
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app pub date -
Jun 19, 2017
filing date -
Jun 19, 2017
priority date (Note) -
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Abstract
The present disclosure provides an isolated power supply and a method of controlling the isolated power supply. The isolated power supply includes a primary side circuit and a secondary side circuit. The primary side circuit includes a first switch with a first voltage thereon, an auxiliary winding with a second voltage thereon, and a controller. The secondary side circuit includes a second switch and a pulse transformer. The method includes: retrieving the first voltage or the second voltage as a specific voltage; sensing an oscillation waveform of the specific voltage after the second switch is turned off at a first timing point in a first cycle; retrieving a second timing point based on the oscillation waveform; and controlling the pulse transformer to adaptively adjust a third timing point for turning off the second switch in a second cycle based on the second timing point retrieved in the first cycle.
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