High power switching power supply having high power factor

Details High power switching power supply having high power factor High power switching power supply having high power factor

1989-01-31

1990-09-11

Wong, Peter S.

Electric power conversion systems

Current conversion

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

363 37, 363 80, H02M 3335

Patent

active

049567608

ABSTRACT:
The switching power supply has a high output power, high efficiency and high power factor. The input signal may be AC or DC. The input current may be substantial even when the input voltage is 0V (zero volts). In order to minimize any distortions, the average input current is sine wave with DC superimposed thereon. No separate power factor correction circuit is employed. Inrush, surge currents and voltage spikes are completely eliminated.
The switching power supply includes a transformer for providing the output signal. At least one capacitor is coupled to ground for storing a voltage. Two switches successively apply voltages of opposite polarities, i.e. the input voltage and capacitor voltage, across primary of the transformer. A charging circuit inverts a polarity of the input voltage and charges the capacitor.

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

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