Device for heat regulation of an enclosure particularly for osci

Details Device for heat regulation of an enclosure particularly for osci Device for heat regulation of an enclosure particularly for osci

1979-02-27

1980-08-05

Reynolds, B. A.

Electric heating

Heating devices

With power supply and voltage or current regulation or...

219210, 219499, H05B 102

Patent

active

042163714

ABSTRACT:
Temperature regulating apparatus for the control of temperature within an enclosure including a temperature measuring circuit which measures the temperature within the enclosure and a semiconductor heating circuit for generating heat responsive to the temperature measuring circuit. The temperature measuring circuit includes a resistive bridge with a temperature sensitive element as one of its legs, the output of the bridge being coupled to an amplifier for developing a temperature signal which varies as a function of the temperature within the enclosure. The heating circuit includes a plurality of transistors having their respective collector-emitter paths coupled in series so that a heating current can flow through the collector-emitter paths of all of the transistors. One of the transistors, designated the control transistor, has its base coupled to the output of the amplifier for controlling the heating current by the temperature signal. A current limiting circuit may be included in a feedback path around the control transistor.

REFERENCES:
patent: 2932714 (1960-04-01), Merrill
patent: 3028473 (1962-04-01), Dyer et al.
patent: 3308271 (1967-03-01), Hilbiber
patent: 3393870 (1968-07-01), Jeffrey
patent: 3395265 (1968-07-01), Weir
patent: 3450863 (1969-06-01), Scholl
patent: 3585364 (1971-06-01), Tadikonda
patent: 3816702 (1974-06-01), Green
patent: 3831003 (1974-08-01), Foerster
patent: 3838248 (1974-09-01), Uchida et al.
patent: 3866587 (1975-02-01), Knapp

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