FREQUENCY CONTROLLER OF A POWER CONVERTER AND RELATED FREQUENCY CONTROL METHOD
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United States of America Patent
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Issued Date -
Jul 28, 2016
app pub date -
Jan 13, 2016
filing date -
Jan 22, 2015
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Abstract
A frequency controller of a power converter includes a valley signal generation unit, a valley selection module, and a gate signal generation unit. The valley signal generation unit generates a valley signal corresponding to a voltage according to the voltage and a reference voltage. The valley selection module generates a valley selection signal according to a gate control signal, a compensation voltage, and the valley signal. The gate signal generation unit generates the gate control signal according to the valley signal, the valley selection signal, the compensation voltage, and a detection voltage. A frequency of the gate control signal is changed with a load of a secondary side of the power converter and a corresponding valley of the voltage within each period of the gate control signal.
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