Electricity: power supply or regulation systems – Output level responsive – Using a three or more terminal semiconductive device as the...
Patent
1995-12-11
1997-02-11
Nguyen, Matthew V.
Electricity: power supply or regulation systems
Output level responsive
Using a three or more terminal semiconductive device as the...
323268, G05F 156
Patent
active
056024630
ABSTRACT:
A direct current or direct voltage power supply operating from a mains AC line is corrected for power factor so that the maximum power can be extracted from the source. The AC line is full-wave rectified, filtered and the resulting pulsating direct voltage is applied to a buck/boost switched inductor switched at a frequency higher than the line frequency. The buck/boost switching action is controlled so that the switchover between buck and boost modes occurs when the instantaneous value of the pulsating direct voltage equals the supply output voltage. The inductor current in the buck mode of operation is controlled to have an input voltage-squared characteristic; the inductor current in the boost mode is controlled to have an input voltage-proportional characteristic. The resulting average current makes the AC line current substantially proportional to the AC line voltage, to achieve substantially unity power factor.
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"Analysis and Design of a Wide Input Range Power Factor Correction Circuit for Three-Phase Applications" R. Ridley et al, IEEE Applied Power Electronics Conference (APEC '93) 1993.
"A New Control Scheme for Buck & Boost Power Factor Correction Circuit", Y. M. Jiang, f. C. Lee, Switching Rectifiers for Power Factor Correction (VPEC), 1993.
"Current Waveform Distortion in Power Factor Correction Circuits Employing Discontinuous-Mode Boost Converters", K. Liu, Y. Lin, IEEE Power Electronics Specialists Conference (PESC '89) 1989.
"Power Factor Correction with Flyback Converter Employing Charge Control", W. Tang et al, IEEE Applied Power Electronics Conference (APEC '93), 1993.
Bendall Clark A.
Peterson William A.
Krauss Geoffrey H.
Lockheed Martin Corporation
Nguyen Matthew V.
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