Voltage waveform detector, power controller and control method for switched-mode power supplies with primary-side control
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United States of America Patent
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Nov 24, 2015
Grant Date -
Jan 16, 2014
app pub date -
Oct 2, 2012
filing date -
Jul 11, 2012
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Abstract
Disclosed are a voltage waveform detector, a power controller and a control method used therein, adaptive for a switched-mode power supply having a power switch and an inductive device. A disclosed power controller has a voltage waveform detector and a constant-current control unit. The voltage waveform detector estimates a discharge time of the inductive device when the power switch is turned off. In the voltage waveform detector, a differential capacitor is coupled between an input node of a comparator and a feedback node, at which the feedback voltage corresponds to a reflection voltage of the inductive device. The constant-current control unit integrates a current-detection signal over the discharge time to control a maximum output current of the switched-mode power supply.
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