Load control circuit including automatic AC/DC discernment

Details Load control circuit including automatic AC/DC discernment Load control circuit including automatic AC/DC discernment

1992-04-06

1994-07-05

Gaffin, Jeffrey A.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

307231, H03K 522

Patent

active

053270169

ABSTRACT:
A control circuit for switching AC or DC loads and for automatically discerning the presence of an AC or a DC power supply via a switch has been provided. The control circuit is coupled to alternately render a switch operative and non-operative wherein the switch is coupled across a load which is powered up by either an AC or a DC power supply. The control circuit includes an AC/DC discernment circuit for ascertaining whether the load is powered up by an AC or a DC power supply. The control circuit also includes circuitry for comparing signals sensed by the switch with predetermined thresholds (which are a function of whether an AC or DC determination has been made) for providing logic signals to control the operation of the switch.

REFERENCES:
patent: 1103693 (1914-07-01), Shedd
patent: 3903375 (1975-09-01), DeWit
patent: 4520310 (1985-05-01), Kelly et al.
patent: 5119019 (1992-06-01), George
patent: 5142221 (1992-08-01), Meldrum et al.
patent: 5225660 (1993-06-01), Mita et al.
patent: 5250893 (1993-10-01), Gambill et al.

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