Power converter possessing zero-voltage switching and output iso

Details Power converter possessing zero-voltage switching and output iso Power converter possessing zero-voltage switching and output iso

1994-01-10

1995-07-18

Stephan, Steven L.

Electric power conversion systems

Current conversion

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

323222, H02M 3335, G05F 110

Patent

active

054347670

ABSTRACT:
A modified boost converter accomplishes power transfer to a load with an electrical isolation, a zero-voltage and a zero-current switching, a transformer core resetting mechanism, and component stresses identical to those in the conventional boost converters. The power converter contains two switching devices, a main one connected in parallel and a secondary one connected in series with a transformer primary winding. A secondary winding of the transformer is connected through an output rectifier to the load. Zero-voltage switching and proper transformer-core resetting are achieved from the resonance that exists between the parasitic capacitance of the secondary switching device and the magnetization inductance of the transformer. A transformer leakage inductance facilitates zero-current switching; thus, reducing the recovery time and current in the output rectifier, and the turn-on switching loss in the conventional main switching device. The switching converter contains a lossless clamping circuit, to limit the voltage stresses across both of the power switching devices to the reflected output voltage appearing across the primary.

REFERENCES:
patent: 4885675 (1989-12-01), Henze et al.
patent: 5111372 (1992-05-01), Kameyama et al.

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