Ramp and pedestal control circuit

Details Ramp and pedestal control circuit Ramp and pedestal control circuit

1976-04-07

1977-10-04

Zazworsky, John

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307318, 323 22SC, H03K 1772

Patent

active

040526240

ABSTRACT:
A ramp and pedestal phase control circuit for controlling electrical energy supplied from an alternating current source to a load. The circuit has a controllable alternating current switching device, and bilateral threshold means is provided for enabling the switching device to conduct current from the source to the load when the magnitude of the voltage across the threshold means exceeds a predetermined value. A first circuit rapidly increases the voltage across the threshold means to a value less than the predetermined value, and a second circuit more slowly further increases the voltage across the threshold means to the predetermined value so as to enable the switching device. The first and second circuits are effective on successive half cycles of the alternating current source to reverse the polarity of the voltage across the threshold means.

REFERENCES:
patent: 3346874 (1967-10-01), Howell
patent: 3403315 (1968-09-01), Maynard
patent: 3421027 (1969-01-01), Maynard et al.
patent: 3495154 (1970-02-01), Dosch et al.
patent: 3594591 (1971-07-01), Laupman
General Electric SCR Manual, Fifth Edition, 1972, pp. 256-257 and 332.

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