Electronic temperature controller. Scheme, description

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Electronic temperature controller. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Power regulators, thermometers, heat stabilizers

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The basic scheme is taken from [1]. In the proposed circuit (Fig. 1, a), a transistor is installed instead of a scarce thermistor R7 (51 kOhm). Without turning on the base wire, it acts as a thermistor, and also serves to reduce heat generation at R3 (30 kOhm), on which the VT8, VT9 stabilizer is made. I powered the voltage regulator from a half-wave circuit, and to reduce heat transfer, I replaced the regulator with a VT6 transistor. Resistor R2 (24 kOhm) was replaced with a 0,47 uF x 400 V capacitor and also powered from a half-wave circuit.

The latter affected the control of the thyristor. Since many thyristors have a large control current.

In the basic circuit, in this case, it is necessary to reduce R2 (24 kOhm), and this is fraught with an increase in the heat generated by R2 (it is necessary to increase the power of R2). When the set temperature is reached, which is maintained with an accuracy of ± 0,05 ° C, the thermostat switches to an economical mode, a voltage is applied to the heating element with a frequency of about 2 Hz, and it is constantly supplied to the basic circuit. Figure 1b shows a variant of the circuit in Figure 1a with a triac.

Electronic temperature controller
Drawings of printed circuit boards and installation of elements for a thermostat using a thyristor are shown in Fig. 2, and using a triac - in Fig. 3.

Electronic temperature controller

References:

Drobnitsa N.A. Automation in everyday life. - K .: Tekhnika, 1984.

Author: Yu.V. Prikhodko

See other articles Section Power regulators, thermometers, heat stabilizers.

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