Series inverter for capacitor charging

Details Series inverter for capacitor charging Series inverter for capacitor charging

1983-05-05

1985-01-29

Wong, Peter S.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363 58, 363136, 315241R, 320 1, H02M 7515

Patent

active

044970188

ABSTRACT:
A series inverter, high voltage capacitor charging circuit includes a current sensor for sensing the current through the load circuit. The sensed current is used to vary the gating frequency of SCRs and to preclude firing of an SCR pair until another SCR pair is in a stable off condition. The gating of each SCR pair is delayed by an amount 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 is longer if insufficient reverse bias is applied to an SCR for quick turn-off of the SCR. The current sensing thresholds of common base transistors depend on whether forward or reflective current is being sensed. A series capacitor in the load circuit is discharged prior to a first cycle of current flow from the dc supply.

REFERENCES:
patent: 3466528 (1969-09-01), Adams
patent: 3935528 (1976-01-01), Brenneisen et al.
patent: 4030021 (1977-06-01), Akamatsu
patent: 4366570 (1982-12-01), Bees

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