Circuit breaker including undervoltage release mechanism and con

Details Circuit breaker including undervoltage release mechanism and con Circuit breaker including undervoltage release mechanism and con

1975-07-11

1977-05-24

Miller, J D

Electricity: electrical systems and devices

Safety and protection of systems and devices

Transient responsive

361 92, 361 87, H02H 324

Patent

active

040258238

ABSTRACT:
A circuit breaker including a solid-state circuit for providing regulated current to operate a holding coil for an undervoltage release mechanism. An alternating current control line feeds a full wave bridge rectifier in the control circuit to provide pulsating direct current to a reference voltage supply circuit, a current regulating circuit, and the holding coil of an undervoltage release mechanism. The current regulating circuit comprises two series connected units of an integrated circuit quad current differential operational amplifier. The output of the second unit controls the base current of a regulating transistor which is series connected to the holding coil. The reference voltage supply circuit includes a transistor connected as a variable resistor to provide operation of the circuit over a wide range of input voltages without excessive heat generation.

REFERENCES:
patent: 2912544 (1959-11-01), Piteo, Jr. et al.
patent: 3110844 (1963-11-01), Brandt, Jr.
patent: 3320493 (1967-05-01), Culbertson
patent: 3428864 (1969-02-01), Barber et al.
patent: 3641546 (1972-02-01), Blackburn
patent: 3742303 (1973-06-01), Dageford
patent: 3784846 (1974-01-01), Krick et al.

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