Computer-checking of the position of a switch whose contacts whe

Details Computer-checking of the position of a switch whose contacts whe Computer-checking of the position of a switch whose contacts whe

1992-03-30

1993-11-02

Pellinen, A. D.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

307137, 307134, H01H 160

Patent

active

052586545

ABSTRACT:
A precharged capacitor connected in parallel with the contacts of an open switch discharges through the switch upon closure. Oxides on the switch contacts are broken through upon closure of the switch to produce a good electrical connection. The capacitor provides sufficient voltage and transient current to clean the switch contacts. A microprocessor having signals of only 5 volts can interrogate a plurality of such switches by multiplexing some semiconductor switching circuits that energize the interrogated switches and by synchronously multiplexing some microprocessor input circuits. The microprocessor's input circuits therefore receive signals indicating the status of each switch in turn.

REFERENCES:
patent: 3794850 (1974-02-01), Hirose
patent: 4851707 (1989-07-01), Lindsay

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