AC voltage regulator

Electricity: power supply or regulation systems – Output level responsive – Using a transformer or inductor as the final control device

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Details

323343, 361 18, 361111, G05F 120, H02H 7055

Patent

active

048536083

ABSTRACT:
An AC voltage regulator includes a transformer arrangement having a plurality of taps so that an input line voltage is passed to an output line with the output line voltage being determined by the nominal value of the input line voltage together with an amount contributed by the transformer. The device is switched by a network of relays one of which acts as a polarity reversal switch so that the voltage generated by the transformer is either added or subtracted to the nominal voltage. Further relays used in two series control the selection of the transformer tap. A transient suppression circuit uses a triac and resistor to communicate current from the input line to the output line with the triac gated into conduction on breaking of a relay contact. The input line voltage is measured by a comparator using a plurality of op-amps in series with the outputs therefrom passing through a logic circuit to control the relays.

REFERENCES:
patent: 2063693 (1936-12-01), McCarty
patent: 3199020 (1965-08-01), Hilker
patent: 3725771 (1973-04-01), Gilmore
patent: 3908163 (1975-09-01), Gilmore
patent: 3913007 (1975-10-01), Gilmore
patent: 4090225 (1978-05-01), Gilker et al.
patent: 4201938 (1980-05-01), Neumann
patent: 4331994 (1982-05-01), Wirth
patent: 4363060 (1982-12-01), Stich
patent: 4377832 (1983-03-01), Toney et al.
patent: 4454466 (1984-06-01), Ritter
patent: 4622513 (1986-11-01), Stich
patent: 4623834 (1986-11-01), Klingbiel et al.
"AC-Operated Power Supplies", 1979, The Radio Amateur's Handbook, Published by the American Radio Relay League, pp. 5-2.

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