System for remotely controlling a load

Details System for remotely controlling a load System for remotely controlling a load

H - Electricity

01

H

348/2, 323/4

H01H 47/32 (2006.01) H01H 47/00 (2006.01) H01H 50/40 (2006.01) H03K 17/13 (2006.01)

Patent

CA 1171949

201,742 A SYSTEM FOR REMOTELY CONTROLLING A LOAD Abstract A system adapted to remotely control a trans- former relay (12). The load switch (36) of a transformer relay (12) is controlled by controlling the direction of current flow in the secondary winding (34). A switch module (26) is coupled with two wires (28) to the secondary winding (34) of the transformer relay (12) providing a unidirectional current flow above a predetermined threshold in the secondary winding (34) in response to a control signal. The unidirectional current flow may be selectively controlled in either direction or may be only purely unidirectional. A control module (14) is then coupled to the switch module (26) momentarily producing the control signal in response to an external stimulus. The switch module (26), the control module (14), or both draw a quiescent current from the secondary winding (34) of the transformer relay (12) when the switch module (26) is not activated. The quiescent current is of an amount which is less than the predetermined threshold. In one embodiment the voltage and current at the control module (14) are limited to values less than those avail- able at the secondary winding (34) of the transformer relay (12).

388919

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