AC Solid-state circuit breaker

Details AC Solid-state circuit breaker AC Solid-state circuit breaker

1979-03-23

1981-01-13

Pellinen, A. D.

Electricity: power supply or regulation systems

Output level responsive

Zero switching

323241, 323244, 361 3, 361 93, 323277, G05F 304

Patent

active

042451841

ABSTRACT:
A solid-state circuit breaker is provided with circuitry for permitting off/on/reset operations actuated by a mechanical toggle control switch for close simulation of magnetic circuit breaker operation. A power continuity feature is provided for load power by locating the control switch so that it opens all of the circuit, except the static power switch branch, between the source and the load, to provide a high degree of fail-safe protection for the apparatus. The power continuity feature includes means for zero crossover synchronization both upon power-up and power-down conditions. A circuit lockout feature is used so that on power-up or turn-on, operation is delayed until the occurrence of an internal power-ready condition. On power-down or turn-off, there is means for circuit retention subsequent to switch opening and internal power removal in order to accomplish load turn-off at a desired zero crossover point of the load power through the power switch. A power supply is incorporated that does not require stepdown or isolation transformers and improves capability for miniaturization of the overall circuitry and enables design of the circuit for operation at any of a wide range of frequencies.

REFERENCES:
patent: 3555292 (1971-01-01), Henry
patent: 3557381 (1971-01-01), Henry
patent: 3879652 (1975-04-01), Billings
patent: 3914625 (1975-10-01), Billings et al.
patent: 3925688 (1975-12-01), Kalfus
patent: 4059849 (1977-11-01), Mitchell

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