Power factor correction circuit having an error signal multiplied by a current signal
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United States of America Patent
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Sep 7, 1999
Grant Date -
N/A
app pub date -
Aug 28, 1997
filing date -
Aug 28, 1996
priority date (Note) -
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status (Latency Note)
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Abstract
A power factor correction circuit for a boost converter includes a current feedforward loop that senses the input voltage by detecting variations in the rate of change of current in an inductor, thereby eliminating the need for a voltage feedforward loop. A current sense circuit generates a current signal responsive to the input current flowing through the inductor when a switching transistor is turned on. A comparator compares the current signal to a sawtooth signal, thereby generating a control signal for turning the transistor off. The output of the converter is controlled by a voltage feedback loop which includes an error amplifier that generates an error signal responsive to the output voltage. The error signal is then multiplied by the current signal before the current signal is compared to the sawtooth signal.
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