Harmonic-resonant power supply

Details Harmonic-resonant power supply Harmonic-resonant power supply

1985-03-04

1987-09-08

Beha, Jr., William H.

Electric power conversion systems

Current conversion

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

363 37, H02M 3337

Patent

active

046928510

ABSTRACT:
A switching inverter power supply has a harmonic semi-resonant circuit associated with an isolation transformer for reducing electromagnetic interference. Fixed-frequency operation with pulse width modulation for regulation is accompanied by controlled current rise and fall times in the transformer primary. The semi-resonant circuit comprises an inductor in series with the transformer primary and a capacitor in parallel with the transformer secondary, transformer leakage inductance being included in the resonance. In one version, the resonant frequency can be set from about the fifth to about the twentieth harmonic of the fixed switching frequency for reducing peak switching currents.

REFERENCES:
patent: 3737755 (1973-06-01), Calkin et al.
patent: 3909695 (1975-09-01), Peck
patent: 4300191 (1981-11-01), Baronowski et al.
patent: 4319316 (1982-03-01), Farrer et al.
patent: 4475149 (1984-10-01), Gallios
Bailey et al, "200 KHz Power FET Technology in OEM Modular Power Supplies," El. Eng., vol. 53, No. 656, pp. 39-42, 45-49, Sep. 1981.
"High Frequency Series Resonant Power Supply" by Raoji Patel and Roger Adair, SEM-300, Unitrode Corp., pp. 5-1 to 5-12.
International Search Report, App. No. PCT/GB86/0059, Completed Apr. 28, 1986.
R. L. Steigerwald: "High Frequency Resonant Transistor DC-DC Converters", IEEE 1984, Transactions on Ind. Elect., IE-31, #2, 5-84, N.Y.

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