Ramp release and reset circuit for a three phase voltage regulat

Details Ramp release and reset circuit for a three phase voltage regulat Ramp release and reset circuit for a three phase voltage regulat

1975-12-22

1976-10-12

Miller, Jr., Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307215, 307269, 323 24, 328181, H03K 408

Patent

active

039860477

ABSTRACT:
An improved ramp control circuit is provided for use in a three phase, SCR phase controlled, voltage regulator. Two, 180.degree. out of phase timing pulses are generated in a pair of comparators for each phase of the three phase input to the system. The comparator switching point is raised above the zero crossover point on each phase input by a voltage offset associated with each comparator. A logical circuit is driven by the predetermined combinations of the 180.degree. out of phase timing pulses from each of the pair of comparators to produce ramp timing pulses at each output of the logic circuit in accordance with the logic in the logical circuit. Each ramp timing pulse is utilized to generate a linear ramp, released and reset by the beginning and end, respectively, of each of said ramp timing pulses.

REFERENCES:
patent: 3514639 (1970-05-01), Gundlach et al.
patent: 3624486 (1971-11-01), Oates
patent: 3735241 (1973-05-01), O'Sullivan

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