Ac to dc power conversion circuit with low harmonic distortion

Details Ac to dc power conversion circuit with low harmonic distortion Ac to dc power conversion circuit with low harmonic distortion

H - Electricity

02

M

321/75, 321/86

H02M 7/06 (2006.01) H02M 3/156 (2006.01) H02M 1/00 (2006.01)

Patent

CA 2021615

Dkt. No. 35-OR-918 AC TO DC POWER CONVERSION CIRCUIT WITH LOW HARMONIC DISTORTION ABSTRACT OF THE DISCLOSURE In an AC to DC power conversion circuit including a boost inductor connected in series between a full-wave rectifier and a DC load, a switch is connected to selectively shunt boost inductor current from the load. Switch conduction is controlled by a pulse width modulator generating switching pulses at a high fixed frequency. The pulse widths are automatically varied as a function of boost inductor current, load voltage, and an ideal sinusoidal waveform derived from the AC input voltage to force the boost inductor current to closely conform to the ideal sinusoidal waveform and thus minimize harmonic distortion, while achieving load voltage regulation and near unity power factor.

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