温度补偿电路的中值设计法

Median Method for Design of Temperature Complemental Circuits

本文分析得出,在温度补偿电路的工作温区中,一个NTC——热敏电阻并联电路存在唯一最佳的微分电阻或最佳的温度特性: dR(TR_x)/DT=-(B-2T_p)~2/(4·BT_p^2)·γ(T_p) 实现最佳温度特性的条件,并联电阻R_x应为 R_x=(B-2T_p)/(B+2T_p)·γ(T_p) 用上述公式设计的热敏电阻补偿电路的方法称为中值法。中值法可以克服传统二、三点设计法的局限性。使用中值设计法补偿电路的PTC——晶体生长计算机控温系统,控温精度达 0.01℃。

This paper indicates that the circuit for a NTC-thermistor in parallel with a resistor has a unique optimum ratio between resistance and temperature, or the so called optimum temperature characteristics, in the working temperature field of temperature complemental circuits. The optimum ratio is expressed as In order to obtain the optimum characteristics of the parallel complemental circuits, the resistance Rx should be The method above mentioned is called Median Method for designing temperature complemental circuits. It is superior to the traditional methods such as 2-points or 3-points circuit designing and has applied temperature control systems such as FTC-1 model, FTC-computer temperature control device within an accuracy of0.01℃.