Short circuit limiting protector

Details Short circuit limiting protector Short circuit limiting protector

1993-11-15

1995-01-10

DeBoer, Todd E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Circuit interruption by thermal sensing

361 58, 361 86, H02H 504

Patent

active

053812964

ABSTRACT:
A current limiting short-circuiting protector is disclosed which utilizes an electronic and thermal feedback principle for achieving precise and rapid release of the protector, which can be readily reset. The principle utilizes a non-linear powerful temperature-dependent resistor in the collector circuit of a field effect transistor which serves as a current valve and through which the total current to be monitored is passed. The circuit replaces a conventional fuse and may also function as a load on/off control means. When a fault occurs in the load, the erroneous current is limited to a much lower value than is the case with a conventional fuse.

REFERENCES:
patent: 3697863 (1972-10-01), Kilmer
patent: 3935511 (1976-01-01), Boulanger
patent: 4531083 (1985-07-01), Hoffman
patent: 4531084 (1985-07-01), Hoffman
Patent Abstract of Japan, vol. 13, No. 323, JP 1-89914 (Apr. 5, 1989).

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