Electric switch operation monitoring circuitry

Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific voltage responsive fault sensor

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Details

340644, G08B 2100

Patent

active

043227694

ABSTRACT:
This switch monitoring circuitry is particularly applicable to switching circuitry for operating a bipolar load device, frequently an inductor, on a source of direct current with four switches arranged to alternate the polarity of potential across the load device in a predetermined periodicity. Such circuitry often is arranged with diode devices individually connected across the switches, especially where the load device is an inductor. The monitoring circuitry specifically described comprises basic logical circuitry having coincidence gating circuits for activating status indicating circuitry; or for controlling associated circuitry for protecting or for compensating the switching circuitry; or for alarming operating personnel of malfunctioning switches.

REFERENCES:
patent: 3872473 (1975-03-01), Melgaard et al.
patent: 3965469 (1976-06-01), Ryan
patent: 3976932 (1976-08-01), Collins
patent: 3999175 (1976-12-01), Thibodeau
patent: 4134025 (1979-01-01), Levin

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