Power failure alarm circuit permitting orderly shutdown of micro

Details Power failure alarm circuit permitting orderly shutdown of micro Power failure alarm circuit permitting orderly shutdown of micro

1982-11-12

1985-05-07

Wise, Edward J.

Boots, shoes, and leggings

364492, 364200, G06F 1556

Patent

active

045162140

ABSTRACT:
A power failure detector for an off-line switcher provides an indication of power failure to a microprocessor load to permit an orderly shutdown without loss of data. The failure detector includes a voltage storage device shunting a secondary winding of a converter power transformer prior to the isolating diode. When its voltage drops below a preset threshold, the microprocessor load is notified that a shutdown action is to be taken.

REFERENCES:
patent: 3937937 (1976-02-01), McVey
patent: 4096560 (1978-06-01), Footh
patent: 4234920 (1980-11-01), Van Ness et al.
patent: 4307455 (1981-12-01), Juhasz et al.
patent: 4375663 (1983-03-01), Arcara et al.

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