基于FFT的RLC测量仪设计  

Design of RLC Measuring Apparatus Based on FFT

作　　者：宋起超[1] 刘静森[1] 杨春光[1] 乔爽[1] 

机构地区：[1]黑龙江工程学院电气与信息工程学院,黑龙江哈尔滨150050

出　　处：《仪表技术》2013年第3期1-4,22,共5页Instrumentation Technology

基　　金：2011年黑龙江省科技攻关项目(GZ11A401)

摘　　要：设计了一种基于ARM、CPLD和双路12 bit AD实现的LCR参数测量仪,完成了L、C、R、Q以及D等参数的测量。系统以STM32F103RBT6作为控制器,控制AD9850产生频率、幅度精准的正弦激励信号,标准正弦信号流经待测电阻、电容或电感与标准电阻的串连电路,通过由TL082组成的电压跟随器、差分放大器后输出各自的电压值,由ARM、CPLD控制双路12 bit的AD9220对其进行采样,并对采样值进行FFT运算,然后利用幅度之比推算出R的值,再借助相位差求得L、C、Q、D的值,同时通过控制多路开关来选择测量的量程,最后将测得的值送到TFT屏幕上显示。An LCR parameter measuring apparatus based on ARM,CPLD and two-way 12-bit AD is designed for the measurement of parameters： L,C,R,Q,R,etc.This apparatus adopts STM32F103RBT6 as its controller which directs AD9850 to transmit a sinusoidal stimulating signal with accurate frequency and amplitude.The series circuit connected to the standard resistance,in which the rated sinusoidal signal goes through the resistance,capacitance or inductance under test,outputs the voltage values respectively by passing the voltage follower made of TL082 and the differential amplifier.Then samples are made by ARM and CPLD controlling a two-way 12-bit AD9220,and the values related will be calculated with FFT.Thus,the value of R is derved from the amplitude ratios,and parameters of L,C,Q and D from the phase differences.Meanwhile,complete with the measurement range selected by the control of multi-way switch,all the values measured will be transmitted onto the TFT screen.

关 键 词：RLC测量仪 FFT CPLD ARM 

分 类 号：TM933[电气工程—电力电子与电力传动]