AC to DC converter with power factor correction
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United States of America Patent
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Jun 29, 2010
Grant Date -
Oct 15, 2009
app pub date -
Apr 11, 2008
filing date -
Apr 11, 2008
priority date (Note) -
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status (Latency Note)
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Abstract
An input current shaping AC to DC converter with PFC front end that reduces input current harmonics is provided. In one embodiment, an AC to DC converter connectable with an alternating current source and operable to output a direct current has a PFC front end followed by a DC/DC converter. The PFC front end reduces harmonic components present in an input current waveform received by the PFC front end from the alternating current source and includes current steering circuitry and, optionally, valley filling circuitry. The DC/DC converter is one that presents pure resistive input impedance to the PFC front end. The DC/DC converter outputs the direct current to a load connected thereto.
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