A Novel LCR Impedance Detection System with Low Cost and High Precision Based on Microcontroller Unit

2023 Photonics & Electromagnetics Research Symposium (PIERS) Pub Date : 2023-07-03 DOI:10.1109/PIERS59004.2023.10221381

Y. Xie, G. Wan, M. Tong

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Abstract

Inductance-capacitance-resistance (LCR) impedance detection system is an important instrument for measuring object impedance, which is widely used in all kinds of testing products, with the characteristics of high precision and wide measurement range. With the continuous enrichment of impedance measurement scenes, impedance detection is becoming more and more embedded. It is of great significance to use MCU and automatic balanced bridge method to design a low-cost and miniaturized impedance detection system. In this paper, the LCR impedance detection system is built by using capacitors, resistors, inductors, MCU, operational amplifiers, analog switches and other devices, which has the advantage of low cost. The ADC and DAC peripherals built in MCU are used for signal conversion, the FFT operation realized by software is used to obtain amplitude and phase, and a single power supply is used at the same time, which further reduces the cost, makes the system more miniaturized, and meets the requirements of measuring speed, frequency and high precision.

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基于单片机的低成本高精度LCR阻抗检测系统

电感-电容-电阻(LCR)阻抗检测系统是测量物体阻抗的重要仪器，广泛应用于各种测试产品中，具有精度高、测量范围广的特点。随着阻抗测量场景的不断丰富，阻抗检测越来越具有嵌入式。利用单片机和自动平衡桥法设计低成本、小型化的阻抗检测系统具有重要意义。本文采用电容、电阻、电感、单片机、运算放大器、模拟开关等器件构建LCR阻抗检测系统，具有成本低的优点。采用单片机内置的ADC和DAC外设进行信号转换，通过软件实现FFT运算获得幅值和相位，同时采用单电源，进一步降低了成本，使系统更加小型化，满足了测量速度、频率和精度的要求。

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2023 Photonics & Electromagnetics Research Symposium (PIERS)

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