Ac voltage regulator

Details Ac voltage regulator Ac voltage regulator

H - Electricity

02

M

323/31

H02M 5/10 (2006.01) H02M 5/12 (2006.01)

Patent

CA 1245285

- 27 - "AC VOLTAGE REGULATOR" ABSTRACT OF THE DISCLOSURE 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 conduc- tion 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.

512690

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