Resonant converter with wide load range

Details Resonant converter with wide load range Resonant converter with wide load range

1995-07-24

1996-08-13

Wong, Peter S.

Electric power conversion systems

Current conversion

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

363 98, 363132, H02M 3335

Patent

active

055462944

ABSTRACT:
Low-power auxiliary circuitry is added to a resonant converter for providing high efficiency operation, low EMI, and tight output voltage control over a wide load range. There is an auxiliary circuit corresponding to each half-bridge connection of main switching devices, each auxiliary circuit including a half-bridge connection of auxiliary switching devices with the junction therebetween coupled to the junction between the main switching devices of the corresponding half-bridge. Under heavy load conditions, sufficient energy is stored in the main resonant inductor to commutate the junctions joining the main switching devices in the resonant converter, resulting in zero-voltage switching for the main switching devices. Under light load conditions, a phase shift is introduced between the corresponding main and auxiliary switching devices, and the auxiliary resonant inductor currents are increased to a level sufficient for the sum of the main resonant inductor current and the corresponding auxiliary resonant inductor current to provide zero-voltage switching for all the bridge switching devices.

REFERENCES:
patent: 4916599 (1990-04-01), Traxler et al.
patent: 4992919 (1991-02-01), Lee et al.
patent: 5267138 (1993-11-01), Shores
patent: 5479337 (1995-12-01), Voigt

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