Power supply monitor for personal computer

Details Power supply monitor for personal computer Power supply monitor for personal computer

1990-12-10

1993-05-25

Eng, David Y.

Boots, shoes, and leggings

3642734, 3649485, G06F 1130, G06F 100

Patent

active

052147827

ABSTRACT:
An indicator circuit for indicating whether the supply voltages of a personal computer are or have been out of tolerance includes window comparators, control circuitry providing each window comparator with a sensed fraction of a particular power supply voltage, and a pair of light emitting diodes of significantly different colors connected in parallel but in opposite polarities. One of the light emitting diodes is normally energized to indicate a normal operating condition, and the other light emitting diode is normally not energized. A latch circuit is provided to switch power from the one LED to the other, to indicate an alarm condition. Output signals from all the window comparators are fed to an OR circuit which in turn controls the latch.

REFERENCES:
patent: 4307455 (1981-12-01), Juhasz
patent: 4747041 (1988-05-01), Engel et al.

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