用于电容传感器的脉宽调制电路  

Design of PWM Circuit Used for Capacitive Transducer

作　　者：周国华[1] 习友宝[1] 古天祥[1] 

机构地区：[1]电子科技大学电子工程学院,四川成都611731

出　　处：《仪表技术与传感器》2012年第6期4-5,24,共3页Instrument Technique and Sensor

摘　　要：设计了一种脉宽调制电路,用于小位移测量。电路以自制的差动电容传感器为基础,由7555定时器、滤波器等电路组成,将微小的位移变化量转化为直流电压,且与位移量基本成线性关系,能实现精度为±0.1 mm的位移测量。电路结构简单、调试方便、成本低,具有很好的稳定性和抗干扰性。实践表明:位移测量的最小二乘线性度为0.33%,灵敏度为0.065 V/mm.A PWM circuit was presented,and it can measure small displacement.The circuit was based on a newly developed differential capacitive transducer,and composed of 7555 timer,filter,and so on.It can transform small displacement into DC.voltage,which is a linear function of the displacement change.The measurement precision is ±0.1 mm.The circuit is simple,convenient and low cost,and has good stability and anti-jamming.Experimental results show that the least-squares linearity of displacement measurement is 0.33%,and sensitivity is 0.065 V/mm.

关 键 词：脉宽调制 自制差动电容传感器 位移测量 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]