Control circuit for an a-c control element

Details Control circuit for an a-c control element Control circuit for an a-c control element

1977-07-06

1979-04-03

Goldberg, Gerald

Electricity: power supply or regulation systems

Remote sensing

323 39, 307252T, G05F 120

Patent

active

041479726

ABSTRACT:
A control circuit for an a-c control element consisting of controlled rectifier elements in conjunction with a transformer in which a separate current transformer is provided for each of the transformer windings and all current transformers of the same respective phase have their secondaries connected together in a bucking circuit, to which a measuring arrangement is connected which measures the peak value of the difference value formed during each half-wave, and the output signal of which is introduced, depending on the polarity of the difference value, into the control circuit of the one or the other branch of the a-c control element.

REFERENCES:
patent: 3663949 (1972-05-01), Froeschle
patent: 3790878 (1974-02-01), Brokaw
patent: 3906337 (1975-09-01), Depenbrock

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