基于FFT的互感式电流信号检测装置的设计

为解决对电路中电流信号的实时监测及谐波分析问题，利用传感器技术设计出一套高精度基于FFT( Fast Fourier Transform) 的互感式电流信号检测装置。该装置可对环路电流信号进行非接触式测量，硬件电路包括互感式电流传感器和检波电路，软件部分以STM32 为主控制器，对信号进行傅立叶变换得到频率和幅度信息。这种以微处理器为核心的测量装置可以实现测量自动化和功能多样化，在工业领域具有一定的应用价值。经实验检测，该系统的频率分辨率可达到1 Hz，幅度分辨率可达到0． 5 mA，测量电流信号频率误差小于2% ，幅度误差小于5%。

Design of Mutual Inductance Current Signal Detection Device Based on FFT

To solve the problem of real-time monitoring and harmonic analysis of current signals in circuits，a high precision mutual inductance current signal detection device based on FFT ( Fast Fourier Transform) is designed by using sensor technology． The device achieves the purpose of non-contact measurement of loop current signal． It consists of hardware and software． The hardware circuit includes mutual inductance current sensor and detection circuit． The STM32 is used as the main controller performing，Fourier transform to get the frequency and amplitude information of the signal． This microprocessor-based measuring device realizes measurement automation and function diversification，and has certain application value in the industrial field．After detection，the frequency resolution and the amplitude resolution achieve 0． 5 mA，the frequency error of thecurrent signal is less than 2%，and the amplitude error is less than 5%．