Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock
Patent
1975-10-28
1976-08-03
Queisser, Richard C.
Electrical transmission or interconnection systems
Personnel safety or limit control features
Interlock
73362AR, 73362SC, G01K 724
Patent
active
039731472
ABSTRACT:
A temperature measuring circuit provides a signal varying linearly in response to temperature variations over a temperature range and includes a thermistor coupled between the collector of a transistor and one terminal of a regulated voltage source. A resistor is coupled between the emitter of the transistor and a second terminal of the voltage source. The voltage at the collector of the transistor varies substantially linearly with variations in the resistance of the thermistor over one segment of the temperature range when the transistor is operated in its linear region. The base of the transistor is biased so that it is operated in its linear region for values of resistance of the thermistor in the one segment of the temperature range and is operated between its linear and saturated regions for values of resistance of the thermistor at temperatures in the remaining segment of the temperature range so that the voltage at the collector electrode varies linearly with the temperature sensed by the thermistor over the complete temperature range.
REFERENCES:
patent: 2871376 (1959-01-01), Kretzmer
patent: 3102425 (1963-09-01), Westman et al.
patent: 3106645 (1963-10-01), Kaufman
patent: 3708700 (1973-01-01), Moser
patent: 3779079 (1973-12-01), Snook
Conkey Howard N.
General Motors Corporation
Queisser Richard C.
Shoon Frederick
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