Electric power conversion systems – Current conversion – With condition responsive means to control the output...
Patent
1996-07-01
1997-10-28
Berhane, Adolf
Electric power conversion systems
Current conversion
With condition responsive means to control the output...
363 16, H02M 7217
Patent
active
056823061
ABSTRACT:
A switched mode power supply is provided which combines voltage regulation and power factor correction in a single converter stage. The power supply comprises a bridge rectifier feeding a double rectified voltage sine wave to a flyback converter comprising input and output circuits connected by an energy-storing transformer. The input circuit comprises an energy-storing inductor, a switching device connected in series with the inductor across the output of the bridge rectifier, a control arrangement for controlling the cyclic turning on and off of the switching device, and a coupling capacitor connected in series with the primary winding of the transformer across the switching device. The control arrangement comprises switch-on timing means for turning on the switching device upon a turn-on condition being reached in which the inductor and transformer have stored energy levels such that the inductor and transformer are equally balanced to charge one another, and on-time control means for maintaining the switching device on for a period dependent on the desired value of said regulated dc output voltage. In this manner, the converter input current is made proportional to the input voltage giving the desired high power factor.
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Berhane Adolf
Hewlett--Packard Company
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