Variable frequency controlled zero-voltage switching single-ende

Details Variable frequency controlled zero-voltage switching single-ende Variable frequency controlled zero-voltage switching single-ende

1995-07-14

1997-06-03

Nguyen, Matthew V.

Electric power conversion systems

Current conversion

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

323222, H02M 3335, G05F 110

Patent

active

056361068

ABSTRACT:
A modified DC-to-AC power converter accomplishes power transfer to a load with electrical isolation, zero-voltage and zero-current switching, using a transformer core resetting mechanism. The power converter contains two switching devices, a main device connected in parallel and a secondary device connected in series with a transformer primary winding. A secondary winding of the transformer is connected through a two-port resonant link circuit to a resistive 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 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: 4866367 (1989-09-01), Ridley et al.
patent: 4885675 (1989-12-01), Henze et al.
patent: 5111372 (1992-05-01), Kameyama et al.
patent: 5262930 (1993-11-01), Hua et al.
patent: 5287261 (1994-02-01), Ehsani
patent: 5434767 (1995-07-01), Batarseh et al.

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