惠斯通电桥式压力传感器温度补偿电路设计

The design of temperature compensation circuit for pressure sensor based on Wheatstong bridge

摘要:

基于惠斯通电桥式压力传感器桥阻随温度变化的特性，电路设计通过利用桥阻随温度变化、桥路电压也随之改变的特性，完成对压力传感器的温度补偿。针对压力传感器灵敏度正温度系数-零位正温度系数、灵敏度正温度系数- 零位负温度系数、灵敏度负温度系数-零位正温度系数、灵敏度负温度系数-零位负温度系数这四种情况进行补偿电路设计，并对传感器灵敏度温度补偿部分电路进行公式推导，选择合适的电路参数。计算结果表明，电路补偿达到理想效果。

Abstract:

The circuit design is based on the characteristics of Wheatstone bridge pressure sensor’s resistance changing with temperature.The temperature compensation of pressure sensor is completed by the change of the bridge voltage with bridge resistance which is dependent on temperature.The circuit is designed for temperature compensate accordance with four types: the positive sensitivity temperature coefficient with positive zero temperature coefficient, the positive sensitivity temperature coefficient with negative zero temperature coefficient, the negative sensitivity temperature coefficient with positive zero temperature coefficient and the negative sensitivity temperature coefficient with negative zero temperature coefficient. The theoretical analysis,formula deduction and practical calculation procedures are also presented. The result of parameter calculation shows that the circuit compensation achieves the ideal effect.