Power factor corrector with efficient ripple attenuator
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United States of America Patent
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Nov 18, 2003
Grant Date -
Dec 19, 2002
app pub date -
May 17, 2002
filing date -
May 22, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Power supply apparatus includes a power factor corrector (PFC) unit, which is adapted to receive an AC voltage from an AC source, and to smooth the AC voltage while adjusting a waveform of an AC input current from the AC source relative to the AC voltage so as to generate a PFC output voltage made up of a DC component with a residual AC ripple. A regulator is coupled to receive an indication of a ripple amplitude and a ripple phase of the residual AC ripple and to generate, responsive thereto, a correction voltage which is combined with the PFC voltage to generate a DC output voltage in which the AC ripple is substantially reduced relative to the PFC voltage.
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