High power switching power supply with high power factor

Details High power switching power supply with high power factor High power switching power supply with high power factor

1989-01-31

1993-11-30

Wong, Peter S.

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

363 80, H02M 3335

Patent

active

052671321

ABSTRACT:
The switching power supply has a high output power, high efficiency and extremely high power factor. The input signal may be AC or DC. A charging circuit operates independently, whereby an average sinusoidal input current is obtained. No separate power factor correction circuit is employed. The switching power supply includes a transformer coupled to ground for providing the output signal. A pair of capacitors is coupled to ground for storing a pair of voltages having opposite polarities. Two switches successively apply the capacitor voltages across primary of the transformer. A rectifier applies the input voltage to one capacitor. The charging circuit inverts a polarity of the input voltage and charges the other capacitor.

REFERENCES:
patent: 4092712 (1978-05-01), Harrigill, Jr. et al.
patent: 4692851 (1987-09-01), Attwood

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