Dibit temperature regulation circuit with complementary transistor

Published:2011/8/26 1:44:00 Author:Jessie | Keyword: Dibit temperature regulation , complementary transistors | From:SeekIC

Thegiven temperature and the actual temperature are compared in the bridge road circuit which is composedof theresistor and thermistor. The relationship between input transistor threshold voltage and temperature is negligible, because the threshold voltage of this circuit is only about 5% of the given effective voltage. The temperature increases while the value of resistor declines, the voltage between NPN transistor base increases, the collector current controls the base of PNP transistor by 1kΩ current limiting resistor, relay suck closes. The hysteresis loop of the circuit is about 0.5%.



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