Flyback converter operating by synchronous rectification with transient protection, primary side control circuit therein, and control method thereof
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United States of America Patent
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Apr 18, 2017
Grant Date -
Jun 16, 2016
app pub date -
Dec 6, 2015
filing date -
Dec 13, 2014
priority date (Note) -
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Abstract
The present invention discloses a flyback converter, a primary side control circuit therein, and a control method thereof. The flyback converter includes: a transformer circuit, a power switch circuit, a primary side control circuit, a synchronous rectification (SR) switch, and a synchronous rectification (SR) control circuit. When a feedback signal indicates that a difference between a target output voltage and an actual output voltage increases, the primary side control circuit increases an operation frequency of an operation signal by step-wisely reducing a cycle period of the operation signal in response to the increase of the difference, wherein the cycle period of the operation signal is reduced by a predetermined unit of time in each step, such that the cycle period of the operation signal is a step function of the increase of the difference.
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