H - Electricity – 05 – B
Patent
H - Electricity
05
B
342/47, 309/69,
H05B 1/02 (2006.01) F24C 15/10 (2006.01) G05D 23/275 (2006.01)
Patent
CA 1337213
A power control switching arrangement for controlling energization of a load in response to an external controller, in which a first semiconductor switch is connected in parallel with the series combination of a first normally open thermally actuated switch and a second normally closed thermally actuated switch, to couple the power signal to the load. A first heater for the first thermal switch is connected in parallel with the load. A second heater for the second thermal switch is connected in series with a second semiconductor switch, across the power supply. The second semiconductor switch, when switched into conduction by the controller, enables energization of the second heater. To energize the load, the controller switches the first semiconductor switch into conduction enabling energization of the load and the first heater. Energization of the first heater closes the first thermally actuated switch, thereby shunting the first semiconductor switch. To de-energize the load, the controller switches the second semiconductor switch into conduction, enabling energization of the second heater. This opens the second thermally actuated switch de-energizing the load and the first heater. De-energization of the first heater enables the first thermally actuated switch to return to its normally open state.
583069
Company General Electric
Craig Wilson And Company
LandOfFree
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