Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1984-06-05
1986-04-29
Beha, Jr., William H.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
320 1, 363 49, 363 56, 363 98, H02M 3337, H02H 7122
Patent
active
045861188
ABSTRACT:
A switching power supply includes an FET full bridge, a controller to drive the FETs, a programmable controller to dynamically control final output current by adjusting pulse width, and a variety of protective systems, including an overcurrent latch for current control. Power MOSFETS are switched at a variable frequency from 20-50 kHz to charge a capacitor load from 0 to 6 kV. A ferrite transformer steps up the DC input. The transformer primary is a full bridge configuration with the FET switches and the secondary is fed into a high voltage full wave rectifier whose output is connected directly to the energy storage capacitor. The peak current is held constant by varying the pulse width using predetermined timing resistors and counting pulses. The pulse width is increased as the capacitor charges to maintain peak current. A digital ripple counter counts pulses, and after the desired number is reached, an up-counter is clocked. The up-counter output is decoded to choose among different resistors used to discharge a timing capacitor, thereby determining the pulse width. A current latch shuts down the supply on overcurrent due to either excessive pulse width causing transformer saturation or a major bridge fault, i.e., FET or transformer failure, or failure of the drive circuitry.
REFERENCES:
patent: 3257604 (1966-06-01), Colclaser et al.
patent: 3299370 (1967-01-01), Massey
patent: 3579078 (1971-05-01), Cronin
patent: 4204266 (1980-05-01), Kammiller
patent: 4233557 (1980-11-01), Alberkrack
patent: 4325113 (1982-04-01), Tomlie
patent: 4344124 (1982-08-01), Panicali
patent: 4399499 (1983-08-01), Butcher et al.
IBM Tech. Discl. Bul., vol. 26, No. 5, pp. 2246-2248, Oct. 1983.
Electronic Product Design, pp. 21, 22 & 27, Jan. 1981.
Beha Jr. William H.
Clouse, Jr. Clifton E.
Hightower Judson R.
Sartorio Henry P.
The United States of America as represented by the United States
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