Zero-current a.c. switching system

Details Zero-current a.c. switching system Zero-current a.c. switching system

1986-03-17

1987-06-02

Hix, L. T.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Arc suppression at switching point

361 7, 361187, 361190, 323319, H02H 720, H03K 1708

Patent

active

046708103

ABSTRACT:
A zero-current a.c. switching system is provided for controlling actuation of relay contacts between a power supply and a load. A primary switch selectively energizes the relay to maintain the relay contacts in the closed state. The load current flowing through the relay contacts to the load is sensed. A secondary switch responds to the sensed load current for normally conducting to energize the relay in parallel with the primary switch. The secondary switch ceases conducting each time the load current drops below a predetermined level to cease energizing the relay and open the relay contacts the next time the load current drops below the predetermined level following the opening of the primary switch.

REFERENCES:
patent: 3808455 (1974-04-01), Leisi
patent: 3946277 (1976-03-01), Lange et al.
patent: 4245184 (1981-01-01), Billings et al.
patent: 4306263 (1981-12-01), Gray et al.
patent: 4356525 (1982-10-01), Kornrumpf et al.
Ritamaki, Pekka, "Optocoupler is Zero--Crossing Detector and Isolator in Trial Power Control", Electric Design 20, (Sep. 27, 1975), p. 104.

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