Dual bimetal power control switching arrangement for electronica

Details Dual bimetal power control switching arrangement for electronica Dual bimetal power control switching arrangement for electronica

1987-11-18

1988-11-29

Paschall, M. H.

Electric heating

Heating devices

With current connection and/or disconnection means

219494, 219483, 219512, 219510, 361 8, 361 13, H05B 102

Patent

active

047884150

ABSTRACT:
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.

REFERENCES:
patent: 3555353 (1971-01-01), Casson
patent: 3783305 (1974-01-01), Lefferts
patent: 3798416 (1974-03-01), Brouneus
patent: 4493980 (1985-01-01), Payne et al.

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