Power supply device and semiconductor device
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United States of America Patent
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Aug 19, 2014
Grant Date -
Oct 20, 2011
app pub date -
Mar 21, 2011
filing date -
Apr 19, 2010
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Switching loss is reduced by decreasing the switching frequency of a PFC power supply in light load condition, whereas the switching frequency is maintained high in heavy load operation. Efficiency in light load operation is thus improved without enlarging a boosting inductor and an output smoothing capacitor. A capacitor is provided in a triangular wave generating circuit and the triangular wave generating circuit outputs a triangular wave by charging and discharging this capacitor. Charging and discharging of the capacitor are controlled by an oscillation frequency control circuit output current which is input to a comparator.
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