AC Uninterruptible power system

Details AC Uninterruptible power system AC Uninterruptible power system

1983-05-23

1984-09-25

Envall, Jr., Roy N.

Electrical transmission or interconnection systems

Plural supply circuits or sources

Substitute or emergency source

307 86, H02J 400

Patent

active

044737564

ABSTRACT:
A system to provide substantially uninterruptible AC power. Line voltage is applied to a load through a solid state electronic switch. A squarewave inverter powered by batteries in connected across the load. When line power is reduced to a predetermined level, the switch opens disconnecting the line, and after a short time delay of less than a millisecond, the inverter starts. Upon restoration of normal line power, the process is reversed; the inverter stops and after a like short time delay, the switch closes reconnecting the line.

REFERENCES:
patent: 3991318 (1976-11-01), Servas et al.
patent: 4177389 (1979-12-01), Schott
patent: 4400625 (1983-08-01), Hussey

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