Circuit breaker with over-temperature protection and low error I

Details Circuit breaker with over-temperature protection and low error I Circuit breaker with over-temperature protection and low error I

1988-01-25

1990-03-20

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361931, 361 94, 361110, 323907, H02H 306

Patent

active

049106317

ABSTRACT:
A circuit breaker with over-temperature protector and low error I.sup.2 t calculator is provided. The over-temperature protector includes a fixed current source which provides current to a resistive element to produce a voltage which thereacross which increases with a positive temperature coefficient as the surrounding temperature increases. The resistor is connected to the base-to-emitter circuit of a transistor. The base-to-emitter circuit has a minimum firing voltage which decreases with an increase in ambient temperature. The value of the resistive element, the amount of current provided by the fixed current source and the transistor base-to-emitter minimum firing voltage are chosen to cause a circuit breaker to be actuated. There is also provided an active memory device which is utilized to discharge a capacitor with a time constant which approximates the heat dissipating time constant associated with a conductor to be protected by the circuit breaker in question.

REFERENCES:
patent: 3588595 (1971-06-01), Silvers
patent: 3702418 (1972-11-01), Obenhaus
patent: 3818275 (1974-06-01), Shimp
patent: 3826951 (1974-07-01), Mater et al.
patent: 4266259 (1981-05-01), Howell
patent: 4315295 (1982-02-01), Zocholl
patent: 4345292 (1982-08-01), Jaeschke et al.
patent: 4347541 (1982-08-01), Chen et al.
patent: 4368420 (1983-01-01), Kuo
patent: 4389619 (1983-06-01), Limberg
patent: 4394957 (1983-07-01), Newton III
patent: 4489295 (1984-12-01), Altenhof et al.
patent: 4503408 (1985-03-01), Mrenna et al.
patent: 4528531 (1985-07-01), Flick et al.
patent: 4539538 (1985-09-01), Flick et al.
patent: 4540961 (1985-09-01), Maier
patent: 4550360 (1985-10-01), Dougherty et al.
patent: 4551597 (1985-11-01), Maier
patent: 4553115 (1985-11-01), Grunert et al.
patent: 4553116 (1985-11-01), Bagalini
patent: 4554421 (1985-11-01), Grunert et al.
patent: 4554423 (1985-11-01), Flick et al.
patent: 4554427 (1985-11-01), Flick et al.
patent: 4563557 (1986-01-01), Lenone
patent: 4594491 (1986-06-01), Lenone et al.
patent: 4603313 (1986-07-01), Shimp et al.
patent: 4639701 (1987-01-01), Shimp
patent: 4695961 (1987-09-01), Arinobu
patent: 4703389 (1987-10-01), Scott
patent: 4751454 (1988-06-01), Dielacher

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