Electricity: electrical systems and devices – Control circuits for electromagnetic devices – For relays or solenoids
Patent
1983-05-09
1984-08-28
Eisenzopf, Reinhard J.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
For relays or solenoids
361190, 361194, H01H 4732
Patent
active
044687150
ABSTRACT:
A shutdown circuit for a TV projection monitor includes a standby power supply energizing a main power supply through contacts controlled by a relay winding in the load circuit of a control transistor that is cut off by a pair of latch transistors that receive operating power through the relay winding. Closure of a momentary contact switch effectively disables the latch transistors and grounds one end of the relay winding which is thereby energized to enable the main power supply. Disabling the latch transistors permits the control transistor to become conductive and hold the relay winding energized. A subsequent closure of the momentary contact switch applies sufficient potential to the latch transistors to drive them conductive and disables the relay winding for deenergizing the main power supply.
Eisenzopf Reinhard J.
Zenith Electronics Corporation
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