论文研究-一种基于Pt100 的测温电路设计方案 .pdf

摘要：当前 Pt100 温度传感器在许多测温电路电路设计中测量效率低下，为了提高 Pt100 温

首先在 Pt100 温度传感器的两端设计了两路恒流源，使电路的电流恒定，不易受到电路中电

流波动的干扰；然后设计了二级放大电路，对 Pt100 采集到的信号进行放大，又在每一级放

大电路中加入了恒压源，为电路提供稳定的参考电压。在软件设计中，首先通过 A/D 转换

关键词：测温电路；Pt100；恒流源；二级放大电路;防脉冲干扰平均滤波法；二分查找法

中图分类号：TP212.9

temperature measurement circuit designs. In order to improve the accuracy of Pt100 temperature

sensor temperature measurement, the article introduces a new high precision temperature

measurement circuit design. At first, the hardware circuit adds two constant current sources at the

both ends of Pt100 temperature sensor, in order to make the current circuit constant, it is not easy

to be disturbed by fluctuation of current. Then design the two stage amplifier circuit, amplifying

the signals acquired by Pt100, added in the constant voltage source in every stage of amplification

circuit, provide a stable reference voltage for the circuit. In the software design, firstly, get the

digital signal through the A/D conversion, then use the average filtering method to filter out the

interference signal; at last, obtain the corresponding temperature value through the binary search

面。

稳定性好、性能可靠的特点。因此铂电阻可以在-200～650℃范围内得到广泛应用。Pt100 是