Low voltage protection circuit

Details Low voltage protection circuit Low voltage protection circuit

1976-03-26

1977-09-06

Miller, J D

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

323 57, H02H 324

Patent

active

040472345

ABSTRACT:
In a load-protection circuit operative with an alternating current voltage source and including circuit means for sensing an undervoltage conditon to control the voltage supplied to a load upon the occurrence of such a condition, the improvement includes a transformer which has input and output windings, and wherein the output winding has two output taps and at least one additional tap. The input winding is connected to the voltage source, and the load is connected across one of the output taps and the additional tap, the other tap and the addition tap being connected to the circuit means for causing the latter to switch the load from the additional tap to the other tap upon occurrece of the undervoltage condition. The voltage across the load is then substantially restored to a normal condition.

REFERENCES:
patent: 2189606 (1940-02-01), King
patent: 2617913 (1952-11-01), Oestreicher
patent: 2994786 (1961-08-01), Pinney et al.
patent: 3195036 (1965-07-01), McNulty et al.
patent: 3226628 (1965-12-01), Kupferberg et al.
patent: 3378759 (1968-04-01), Eaves et al.

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