摘要
针对电容式变换器性能检测系统中,由于寄生电容和磁屏蔽等影响,降低了变换器容值输入精度的问题,设计了一款带pF级开关电容阵列的电容式变换器性能检测系统。首先,搭建pF级开关电容网络,通过超低寄生电容器件的选取、开关电容网络电路和多层PCB板的设计,降低了电路中的寄生电容并增强了系统的磁屏蔽能力。其次,搭建变换器6选1模块,用于变换器输出数据的采集与处理。再次,基于STM32搭建核心处理模块,用于系统的控制、数据的分析与存储。最后,在电容式变换器上进行不同容值输入的测试。测试结果表明,pF级开关电容网络输出容值精度达到±0.04pF,且系统采集变换器输出电压精度达到4mV。实验结果验证了本检测系统的可靠性和精度,为后续相应系统的开发提供了重要的参考和设计依据。
In the performance test of capacitive transducer,due to parasitic capacitance and electromagnetic shielding problems, it’s difficult to ensure the precision of capacitance value,so design a switched capacitor network to solve this problem.First, building the switched capacitor network module,through choosing low parasitic capacitance components and designing multiple layers PCB boards,can reduce the parasitic capacitance and improve the capability of electromagnetic shielding.Then,building 6 choose 1 module for data acquisition and processing.Furthermore,building processing central module based on STM32 for system control,data analysis and storage.Finally,carrying out different capacity value tests on capacitive transducer.The test results showed that the accuracy of capacity value reached ＆#177;0.04 pF in switched capacitor network module,and acquisition accuracy reached 4 mV.The experimental results verify the reliability and accuracy of this test system,and it provides an important reference for further development.
出处
《电子测量技术》
2015年第8期104-108,共5页
Electronic Measurement Technology
作者简介
云子，1965年出生，高级工程师。主要研究方向为机电一体化。E-mail：yunzi200606@sina．com骆玉霞，1990年出生，硕士研究生。主要研究方向为机电系统控制及自动化。E-mail：461912437@qq．com.
