Monitoring system for load-driving switch circuits

Details Monitoring system for load-driving switch circuits Monitoring system for load-driving switch circuits

1985-04-16

1988-07-12

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 78, 361 88, 361 91, H02B 328

Patent

active

047574178

ABSTRACT:
Disclosed is a monitoring system for a load-driving switch circuit, in which a switch circuit arranged in a circuit for driving an electrical load is controlled and opened or closed by a fail-safe input signal Si, the conduction state or non-conduction state of the switch circuit is detected by taking out a high voltage or low voltage from terminals of the switch circuit, and logical addition of this terminal voltage and the input signal Si is performed to detect whether or not the terminal voltage is in agreement with the input signal Si, whereby malfunction of the load owing to trouble in the switch circuit is monitored.

REFERENCES:
patent: 3557381 (1971-01-01), Henry
patent: 3992636 (1976-11-01), Kiffmeyer
patent: 4320434 (1982-03-01), Stirk
patent: 4363068 (1982-12-01), Burns

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