Electrical transmission or interconnection systems – Switching systems – Condition responsive
Patent
1977-03-14
1978-09-05
Hix, L. T.
Electrical transmission or interconnection systems
Switching systems
Condition responsive
307252B, 361178, H01H 3518
Patent
active
041123123
ABSTRACT:
A solid state fluid sensitive switching member which utilizes fluid contained in a cavity to conduct the heat generated during high current switching operations away from the temperature-sensitive solid state elements of the switching member. A heat sinc tab thermally connected to the solids state elements is positioned in the cavity where the presence or absence of a fluid is to be monitored. When fluid is present in this cavity, the solid state elements which produce heat are in a closed circuit configuration and the heat sinc tab directly conducts heat from the heat-producing solid state members into the fluid being monitored. When no fluid is present in the monitored fluid cavity, the heat sinc potentials of such fluid are absent. However, in this configuration the solid state circuit elements are in an open circuit configuration and do not produce substantial amounts of heat, so that no heat sinc is required. Thus, the present invention takes advantage of the fact that the only time the circuit elements require cooling is when fluid which is being monitored is present, and the fluid itself may therefor be used as a heat sinc for the solid state members.
REFERENCES:
patent: 3196679 (1965-07-01), Howland
patent: 3244833 (1966-04-01), Gillett
patent: 3696362 (1972-10-01), Sieron
patent: 3734123 (1973-05-01), Pomerantz
patent: 3794886 (1974-02-01), Goldman
patent: 3881181 (1975-04-01), Khajezadeh
patent: 3893161 (1975-07-01), Pesak
patent: 3944845 (1976-03-01), Luteran
Hix L. T,.
Schreyer S. D.
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