POWER FACTOR CORRECTION CIRCUITS
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United States of America Patent
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Issued Date -
Jan 31, 2008
app pub date -
Jul 24, 2007
filing date -
Jul 31, 2006
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
Power factor correction circuits are provided, in which a boosting converter comprises a switching element and an inductor, to convert a rectified voltage to a DC output voltage. An adjustment unit comprises a thermister with positive temperature coefficient, to generate an adjustment signal according to a present temperature and the DC output voltage. A control unit controls a duty cycle of the switching element according to the adjustment signal, thereby adjusting the voltage difference between the rectified voltage and the DC output voltage.
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