Safety device for electric consumers in motor vehicles

Details Safety device for electric consumers in motor vehicles Safety device for electric consumers in motor vehicles

1980-07-08

1983-02-01

Eisenzopf, Reinhard J.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Circuit interruption by thermal sensing

307 10R, 361 55, 361 57, 361 94, H02H 504

Patent

active

043719104

ABSTRACT:
Safety apparatus for a motor vehicle electric consumer having a temperature-dependent internal resistance, which includes a temperature indicating circuit for providing a signal which accurately indicates the consumer temperature to a threshold switch which actuates a switching device to interrupt current flow through the consumer whenever the consumer temperature exceeds a predetermined maximum value. The temperature indicating circuit either may be a consumer resistance measuring circuit such as a bridge circuit including the consumer in one leg thereof, or may be a consumer temperature replicating circuit, connected in parallel with the consumer, such as a special RC network. The switching device either may be a switch connected in series with the consumer, or a switch connected in parallel with the consumer, in which case the apparatus also includes an overcurrent device connected in series with the parallel combination of the switch and the consumer.

REFERENCES:
patent: 3253189 (1966-05-01), Wouk
patent: 3579036 (1971-05-01), McCoy
patent: 3697863 (1972-10-01), Kilner
patent: 4168456 (1979-09-01), Isobe
patent: 4200829 (1980-04-01), Pohl

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