Failsafe monitoring system with input controlled switch circuits

Details Failsafe monitoring system with input controlled switch circuits Failsafe monitoring system with input controlled switch circuits

1985-04-24

1987-04-28

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 87, 361101, H02H 710

Patent

active

046618805

ABSTRACT:
According to the load-driving switch circuit monitoring system of the present invention, on-off control of a switch circuit connected to in a circuit in series for driving an electric load is performed according to a fail-safe input signal Si, and conduction or non-conduction of the switch circuit is detected based on a load current in the driving circuit. An input signal converter and a load current signal converter, each of which puts out two different voltage values according to the input signal and load current detection signal and a signal of a problem of the converters per se, are arranged. A monitor signal generator is disposed to monitor only the normal correspondence relation (S) between the input signal Si and load current in the normal function state of the switch circuit among said three outputs generated by each converter. This monitor signal generator generates a high voltage output only when this normal correspondence relation (S) is detected, and when the correspondence relation is not normal or when a problem takes place in the input signal converter or the load current signal converter, the monitor signal generator generates a low voltage output, whereby malfunction of the load by the problem in the switch circuit and both the converters is monitored.

REFERENCES:
patent: 3735203 (1973-05-01), Fujie et al.
patent: 3934940 (1976-01-01), Schnaibel
patent: 4486802 (1984-12-01), Claussen
patent: 4509102 (1985-04-01), Ayer
patent: 4540939 (1985-09-01), Osborne
patent: 4555742 (1985-11-01), Gray et al.

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