Design and implementation of field calibration device for voltage monitor based on ARM+FPGA
For solving the accuracy reduction of voltage monitor due to aging and bad environment,a field calibration scheme for voltage monitor based on ARM+FPGA is proposed in this paper.The princi-ple and index of the calibration system are introduced,as well as design diagram of the system.The de-sign scheme of ARM+FPGA control module,amplitude adjustment circuit,filter circuit,power amplifier circuit and communication circuit are described in detail.Considering serious harmonic pollution of power grid,a robust phase-locked loop is used to realize harmonic detection for improving system accuracy.The software of the calibration system is described,realizing functions of voltage monitoring and error cal-ibration.Accuracy and long-term stability of the system are tested in non-harmonics and harmonic en-vironments.The experimental results show that the calibration system can produce a standard voltage source with 0.05 precision,meets the requirements of calibration and long-term stability,and can solve the problem of field calibration of voltage monitor.
voltage monitorfield calibrationharmonicrobust phase-locked loop
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