POWER FACTOR CORRECTION CIRCUIT CAPABLE OF ESTIMATING INPUT CURRENT AND CONTROL METHOD FOR THE SAME
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United States of America Patent
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Issued Date -
Apr 18, 2013
app pub date -
Aug 20, 2012
filing date -
Oct 13, 2011
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Abandoned
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Abstract
A power factor correction circuit and a control method thereof uses a power factor controller to generate a compensation current signal according to an input voltage of an AC-DC conversion circuit and a filter capacitor value. An estimation current signal is generated by summing up the compensation current signal and an inductor current signal of the AC-DC conversion circuit. And then, a pulse width modulation signal is outputted to the AC-DC conversion circuit according to the estimation current signal. The filter capacitor value is chosen from a capacitor value of a capacitor connected to the AC power source, an input capacitor value of the AC-DC conversion circuit, or sum of both the capacitor values. Therefore the estimation current signal approaches an input current signal of the power factor correction circuit to increase the power factor at the input terminals of the power factor correction circuit and decrease a harmonic distortion.
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