Interface circuit for interconnecting an electronic controller t

Details Interface circuit for interconnecting an electronic controller t Interface circuit for interconnecting an electronic controller t

1979-04-26

1981-02-17

Shoop, William M.

Electricity: power supply or regulation systems

External or operator controlled

Phase controlled switching using electronic tube or a three...

323907, 219494, 340584, H02H 7127

Patent

active

042517648

ABSTRACT:
An interface circuit is provided for interconnecting an electronic controller to a contactor circuit which, in turn, controls the alternating current flow from an alternating current power source to controlled equipment, such as a resistance welding machine. The contactor circuit, for example, includes a pair of semiconductor switching devices, such as silicon controlled rectifiers (SCR)s, the two semiconductor switching devices are alternately rendered conductive during successive half-cycles of the alternating current power from the alternating current power source at times controlled by the controller for the controlled operation of the welding machine. The interface circuit includes means for monitoring the junction temperature of each of the semiconductor switching devices, and to provide an indication and a control effect should the junction temperature exceed a particular safe threshold.

REFERENCES:
patent: 3419214 (1968-12-01), Evalds
patent: 3564293 (1971-02-01), Mungenast
patent: 4021701 (1977-05-01), Davies
patent: 4039928 (1977-08-01), Noftsker et al.
patent: 4052744 (1977-10-01), Boothman et al.
patent: 4117527 (1978-09-01), Demarest et al.

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