Control circuit applicable to power converter and operation method thereof
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United States of America Patent
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May 24, 2016
Grant Date -
May 21, 2015
app pub date -
Nov 17, 2014
filing date -
Nov 19, 2013
priority date (Note) -
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Abstract
A control circuit includes an auxiliary pin for receiving an auxiliary voltage of an auxiliary winding of a power converter; a first detection unit for detecting a first time point when the auxiliary voltage begins resonance, and outputting a first detection signal according to the first time point; a second detection unit for detecting a second time point when the auxiliary voltage reaches a predetermined voltage, and outputting a second detection signal according to the second time point; a delay time controller for obtaining a delay time according to a output time difference between the first detection signal and the second detection signal, and outputting a driving signal with delay of the delay time when receiving the second detection signal; and a gate control signal generator for generating a gate control signal to a power switch of the power converter according to the driving signal of the delay time controller.
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