Self protecting and automatic resetting capacitor synchronous sw

Details Self protecting and automatic resetting capacitor synchronous sw Self protecting and automatic resetting capacitor synchronous sw

1989-04-13

1990-06-12

Paschall, M. H.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Voltage regulator protective circuits

323223, 323239, 315248, 315291, 363127, H02H 700

Patent

active

049337980

ABSTRACT:
A power controller is provided for controlling the average power provided from an AC voltage source power supply to an AC electrical load. Three shunt connected elements, comprising two electronic switches and a capacitor with rectifying diodes, are connected betwen the AC source and the load. A control circuit controls switching of the switches in timed relationship to the state of the voltage on the shunt capacitors so as to control the average power supply to the load. The control circuit switches one of the electrical switches to the conductive state thereof near the zero crossover of the AC wave of the source voltage and subsequently switches the second switch to the conducting state thereof at a variable time during each half wave in a manner that causes the first switch to return to the non-conducting state thereof. The second switch returns to the non-conducting state thereof at a later time prior to the end of the AC half wave so that the load current is not discontinuous except at the zero crossover points.

REFERENCES:
patent: 3835401 (1974-09-01), Tomita et al.
patent: 4016481 (1977-04-01), Bradley
patent: 4350935 (1982-09-01), Spira et al.
patent: 4542451 (1985-09-01), Hucker
patent: 4636619 (1987-01-01), Sugimori

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