Load current commutation circuit

Details Load current commutation circuit Load current commutation circuit

H - Electricity

01

H

H01H 33/16 (2006.01) H01H 9/54 (2006.01) H03K 17/04 (2006.01) H03K 17/687 (2006.01)

Patent

CA 2068186

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 function, 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.

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