Series inverter with shunted transformer for regulation of capac

Details Series inverter with shunted transformer for regulation of capac Series inverter with shunted transformer for regulation of capac

1986-12-16

1989-03-07

Beha, Jr., William H.

Electric power conversion systems

Current conversion

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

315241R, 320 1, 363 96, 372 82, H02M 3315

Patent

active

048111880

ABSTRACT:
A series inverter, high voltage capacitor charging circuit includes current sensors for sensing the current through each SCR in the circuit. The sensed current is used to vary the gating frequency of the SCRs and to preclude firing of an SCR until the other is in a stable off condition. The gating of each SCR is delayed by an amuont of time determined by a control capacitor charging circuit. That charging circuit is inhibited as long as one of the SCRs is conducting and once the load voltage has reached a predetermined level. The time constant of that charging circuit can be changed as the desired level is approached of if insufficient reverse bias is applied to an SCR for quick turn-off of the SCR. Resolution of the system can be increased by a shunt regulator which shorts the output transformer. The circuit can be disabled if the high voltage capacitor does not reach its set level within a given time.

REFERENCES:
patent: 3588523 (1971-06-01), Grafton et al.
patent: 3860864 (1975-01-01), Fitz
patent: 3939396 (1976-02-01), Larson
patent: 3953779 (1976-04-01), Schwarz
patent: 4233546 (1980-11-01), Berthiaume
patent: 4366570 (1982-12-01), Bees
patent: 4506196 (1985-03-01), Bees
Jenry W. Gayek, "Power Conditioning for Thermoelectric Generators," IECEC, 1968, pp. 669-679.
P. J. Fitz, et al., "A Thyristor Switched High Frequency Inverter for Directly Charging a Line Type Modulator," Marconi Research Laboratories, pp. 110-117.

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