Series resonant converter having an actively controlled third el

Details Series resonant converter having an actively controlled third el Series resonant converter having an actively controlled third el

1993-09-30

1995-02-07

Stephan, Steven L.

Electric power conversion systems

Current conversion

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

323282, H02M 3335

Patent

active

053880404

ABSTRACT:
A series resonant converter comprising an actively-controlled third element, or actively-controlled resonant preload. The actively-controlled third element is controlled by logic that makes it operative only when it is required by load conditions, and thus the desired characteristics of the third element are only employed when needed. The present invention incorporates the actively-controlled reactive preload and which operates on demand, and results in a converter output that is able to regulate from no load to full load. The third element is operated on demand and only at low power levels, and there is no penalty of higher RMS current in the power chain. The present invention is particularly applicable for use in charging batteries used in electrical vehicles. With the features provided by the present invention, an induction battery charger is able to use a high efficient resonant power supply, incorporating very low volume and weight coupling transformers, and which operates at high frequency and high power. The present invention may be used with all multi-element resonant converters that utilize more than two elements. The present invention improves on all resonant converters and provides for a more desirable operating characteristics, particularly in the case of load regulation.

REFERENCES:
patent: 4301398 (1981-11-01), Johnson
patent: 4342076 (1982-07-01), Rosswurm et al.
patent: 4648017 (1987-03-01), Nerone
patent: 4761727 (1988-08-01), Kammiller
patent: 4926302 (1990-05-01), Harada et al.
patent: 5172308 (1992-12-01), Tohya
patent: 5293111 (1994-03-01), Weinberg
patent: 5317494 (1994-05-01), Noro
"Topologies For Three Element Resonant Converters", R. Severns, published in APEC, 1990, pp. 712-722.
"A Comparison of Half-Bridges Resonant Converter Topologies", R. L. Steigerwald, IEEE Transactions on Power Electronics, vol. 3, No. 2, Apr. 1988, pp. 174-182.

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