一种基于Pt100 的测温电路设计方案

Now,the Pt100 temperature sensor for measuring efficiency is low in many temperature measurement circuit design. 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 add two constant current source 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 method and display the temperature.?????