Electrical heating method and circuit of electronic device at low temperature
A technology for electronic equipment and electric heating, which is applied in the direction of using electric means for temperature control, auxiliary controllers with auxiliary heating devices, etc., which can solve the problems of equipment burning, failure to achieve normal working performance, and affecting the opening of electronic equipment circuits. To achieve the effect of efficient work
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[0018] The acquisition circuit for low-temperature temperature changes of electronic (electrical) equipment: The acquisition circuit of low-temperature temperature changes adopts a bridge circuit, and the four resistances of the four bridge arms are R11, R12, R21, Rt, and Rt is the thermal sensor - -Thermistor. Then, according to the law of the bridge circuit, there are VA=(R11:R11+R12)V reference power, and VB=(R21:R21+RT)V reference power. When R11:R12=R21:RT, VA=VB, that is, VA-AB=0, which is the bridge balance point; when one bridge arm changes, R11:R12≠R21:RT, such as the change of the sensitive resistance of RT , VA-AB changes accordingly. Realize the temperature change into the voltage difference change.
[0019] RT thermistor, for example, choose a 10K OHM NTC resistor with a temperature characteristic of 4100, and a resistance with a temperature characteristic of 4100 --- the temperature curve is image 3 When the temperature drops, the resistance increases basically l...
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