Load circuit commutation circuit

Details Load circuit commutation circuit Load circuit commutation circuit

1991-06-17

1992-11-17

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Arc suppression at switching point

361 8, 361 11, 361 13, H01H 942

Patent

active

051648725

ABSTRACT:
Arrangement for arcless interruption of a-c load current in response to a current interruption command. Separable contact means serially connected with controlled impedance means, and parallel connected diversion means are intermediate the a-c source and the load. The controlled impedance comprises field effect transistors (FETs). Since FETs usually have only a single inherent junction, at least a pair of the FETs are oppositely poled so that load current can be cut off notwithstanding the direction of current flow when interruption is commanded. The pair of FETs may be connected back to back. An alternative embodiment has two branch circuits each comprising a FET and a separable contact means. Upon interruption load current is sequentially transferred from one to the other branch circuit and then to the diversion means.

REFERENCES:
patent: 4429339 (1984-01-01), Jaeschke et al.
patent: 4631621 (1986-12-01), Howell
patent: 4636907 (1987-01-01), Howell
patent: 4644309 (1987-02-01), Howell
patent: 4700256 (1987-10-01), Howell
patent: 4723187 (1988-02-01), Howell

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