High-precision non-contact temperature control circuit three
Source: InternetPublisher:蓝猫淘气 Keywords: No contact high precision temperature control circuit BSP Updated: 2021/08/15
It uses operational amplifier A as a voltage comparator.
The measuring bridge consists of resistors Ri, R2, potentiometer RP and diode VDi. The internal resistance of VDi is determined by the heat (temperature) emitted by the electric heater EH, thereby changing
the balance state of the measuring bridge, controlling the work of the operational amplifier A, realizing the input and disconnection of the electric heater, and maintaining the constant temperature of the thermostat
. The temperature control accuracy of this circuit can reach ±0. 05℃. Adjust the potentiometer RP to change the temperature set value.
Since the triode VTi is used to control the electric heater, the maximum heating current of this circuit is 0.3A. If a more powerful
triode or thyristor is used, a very powerful electric heater can be driven.
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