Uninterruptible power supply

Details Uninterruptible power supply Uninterruptible power supply

1993-03-22

1994-02-22

Gaffin, Jeffrey A.

Electrical transmission or interconnection systems

Plural supply circuits or sources

Substitute or emergency source

307 66, 307 48, H02J 906

Patent

active

052890457

ABSTRACT:
An uninterruptible power supply provides internal connection to an auxiliary power to provide continuous device power without duplicating regulation and switching circuits. The power supply includes an AC to DC converter, a transformer and a switch applying DC power from converter to the transformer. A pulse width modulation control circuit assures a regulated output voltage while application of auxiliary power is controlled by a fixed time interval one-shot that assures a smooth transition to AC utility power upon resumption of such power following a failure. An auxiliary AC power output signal is maintained for a video monitor or other device even while operating on auxiliary power.

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