Circuits and methods for driving a load with power factor correction function
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United States of America Patent
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-
Mar 27, 2012
Grant Date -
Dec 23, 2010
app pub date -
Jun 17, 2010
filing date -
Jun 22, 2009
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A circuit for driving a load includes a power line, converter circuitry, and a controller. The power line is operable for providing an input current and an input voltage. The converter circuitry coupled to the power line is operable for converting the input voltage to a regulated voltage to drive the load, and for providing a current detection signal indicating whether a converter current flowing through the converter circuitry drops to a predetermined level. The controller coupled to the converter circuitry is operable for correcting a power factor of the circuit based on the current detection signal and the input voltage such that a waveform of the input current follows a waveform of the input voltage.
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