FET power converter with reduced switching loss

Details FET power converter with reduced switching loss FET power converter with reduced switching loss

1986-08-28

1988-02-23

Beha, Jr., William H.

Electricity: power supply or regulation systems

In shunt with source or load

Using choke and switch across source

323287, 323351, H02M 3137

Patent

active

047273089

ABSTRACT:
A DC to DC power converter having reduced switching loss for operation at high frequencies. As disclosed, a buck, or forward, converter includes a first FET as the switching device in series with an inductor and a second FET as the flywheel device. At the common node to which the two FET's and the inductor are connected, there is sufficient capacitance that the FET's may be turned off without appreciable voltage change across the FET's. The value of the inductor is chosen, with respect to the input and output voltages and frequencies of operation involved, to insure that the inductor current polarity reverses each cycle, raising the node voltage to the level of the input voltage, substantially eliminating turn-on losses of the first FET. Control circuitry is provided for regulation of the power converter to control the peak-to-peak current in the inductor and to insure that at least a selected minimum value of the inductor current is present for each cycle of operation of the converter. An over-voltage protection circuit for the output of the converter is also provided.

REFERENCES:
patent: 3618130 (1971-11-01), Garuts
patent: 4323845 (1982-04-01), Leach
patent: 4415959 (1983-11-01), Vinciarelli
patent: 4449174 (1984-05-01), Ziesse
patent: 4513360 (1985-04-01), Ikenoue et al.
patent: 4524412 (1985-06-01), Eng
patent: 4553082 (1985-11-01), Nesler
patent: 4622627 (1986-11-01), Rodriguez et al.
IBM Technical Disclosure Bulletin Article by E. A. Dobberstein, vol. 27, No. 9, Feb. 1985, pp. 5419-5421.
Article by S. Cuk and R. W. Erickson Republished from Proceedings of Powercon 5, the Fifth National Solid-State Power Conversion Conference, held May 4-6, 1978, in San Francisco Calif.

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