Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1993-07-23
1994-09-20
Voeltz, Emanuel T.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
315411, 348730, H02M 3335
Patent
active
053495152
ABSTRACT:
In a switch mode power supply, a full wave rectified AC mains supply voltage is produced from an AC mains supply voltage without low-pass filtering. The unfiltered rectified voltage is applied to a winding of a flyback transformer that is coupled to a switching transistor. A first plurality of current pulses are generated in the winding from the rectified voltage at a frequency that is higher than the frequency of the mains supply voltage and at peak amplitudes that vary in a manner to reduce a power factor. A second supply voltage is applied via a second switching transistor to the winding to produce in the winding a second plurality of current pulses that reduce a ripple component at an output of the power supply. The second plurality of current pulses are pulse-width modulated in a feed-forward manner during a period of the mains supply voltage in accordance with the mains supply voltage. An overload threshold point is also shifted to a higher value remotely from the peak of the mains voltage, in a feed-forward manner. This results in the power factor being less affected by load variations.
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A publication entitled Power Supply Controls published by Unitrode Integrated Circuit.
Henig Sammy S.
Laks Joseph J.
RCA Thomson Licensing Corporation
Tripoli Joseph S.
Voeltz Emanuel T.
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