Power converter
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United States of America Patent
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Jun 12, 2012
Grant Date -
Jan 21, 2010
app pub date -
Mar 12, 2007
filing date -
Mar 10, 2006
priority date (Note) -
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Abstract
This invention relates to a power converter (1) comprising a converter input (3), a converter output, a power factor pre-regulation stage (5), an isolation stage (7) and a control unit (9). The power factor pre-regulation stage (5) further comprises a buck power factor correction (PFC) circuit (15) and a bulk capacitor (25) fed by the buck PFC circuit. The amount of line current provided to the bulk capacitor (25) by the buck PFC circuit (15) may be adjusted according to the converter requirements in order to keep the voltage across the bulk capacitor (25) sufficient to ensure uniform operation of the power converter. Monitoring of the voltage across the bulk capacitor (25) and monitoring of the isolation stage (7) output current is provided to determine when additional current is to be applied to the bulk capacitor (25) and to ensure the power converter (1) operates within pre-defined parameters.
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