Power supply circuit utilizing voltage and current resonance for

Details Power supply circuit utilizing voltage and current resonance for Power supply circuit utilizing voltage and current resonance for

1992-09-22

1994-05-31

Beha, Jr., William H.

Electric power conversion systems

Current conversion

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

323282, 363 19, H02M 3338

Patent

active

053174941

ABSTRACT:
In a power supply circuit, upon turning on of a switching element, a sinusoidal resonance current flows through a series resonance circuit and a smoothing capacitor of a dc output circuit is thereby charged. This resonance current is reversed after a half cycle and a rectifying diode is thereby reversely biased whereby the resonance path is cut off and the resonance current is automatically ceased. While the switching element is on, exciting of an inductance and charging of a capacitor are made in a parallel resonance circuit, though resonance is not made therein. By turning off the switching element in a current zero state thereafter, a parallel resonance by the parallel resonance circuit is started. The switching element is turned on at a timing when voltage of the parallel resonance circuit has returned to a power source voltage. A power supply circuit performing all switching operations at a voltage zero state or a current zero state is realized with a single power source and a circuit design thereby can be simplified.

REFERENCES:
patent: 4685041 (1987-08-01), Bowman et al.
patent: 4814962 (1989-03-01), Magalhaes et al.
patent: 4845605 (1989-07-01), Steigerwald
patent: 4857822 (1989-08-01), Tabisz et al.
patent: 5177675 (1993-01-01), Archer

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