Design and implementation of high-precision voltage measurement system based on Kalman filter and automatic calibration technology. (30th November 2022)

• Record Type: Journal Article
• Authors: Hu, Hongjun; Shen, Haikuo; Pu, Qian
• Is Part Of: Measurement. Volume 204(2023)
• Publication Date: 2022-11-30
• Subjects: Precision voltage measurement -- Kalman filter -- Amplitude switching detection -- Self-calibration -- Wideband calibration model; Weights and measures -- Periodicals; Measurement -- Periodicals; Measurement; Weights and measures; Periodicals; 530.8
• DOI: 10.1016/j.measurement.2022.112126
• Languages: English
• ISSNs: 0263-2241

Abstract

Highlights: Design of the wideband high-precision voltage measurement system. Proposing a modified Kalman filter to reduce measurement noise. Building a self-calibration circuit to eliminate DC voltage measurement errors. Analysis of the frequency response for the resistive-capacitive voltage divider. Developing a wideband calibration model to correct AC voltage measurements. Abstract: With the rapid development of science and technology, precision measurement is of increasing importance. In this paper, we discuss noise reduction and automatic calibration issues for a high-precision voltage measurement system that covers voltages from 0.1 µV to 300 V and a frequency range from 10 Hz to 300 kHz (including DC). First, a modified Kalman filter is proposed to reduce measurement noise. Then, a self-calibration circuit is constructed to eliminate the systematic errors in DC voltage (DCV) measurements. Finally, a wideband AC calibration model is developed to overcome the defects in AC voltage (ACV) measurements caused by AC characteristics. The measurement application demonstrates the effectiveness of the proposed methods----the designed voltage measurement system has a DCV measurement accuracy of better than 9 µV/V and a high ACV accuracy of 0.25 mV/V in the frequency range of 30 Hz to 30 kHz at an ambient temperature of 25 °C. In addition, the minimum DC measurement uncertainty obtained on the DCV 10 V range is 0.4 μV/V (type A) and the minimum AC measurement uncertainty obtained on the ACV 10 V range is 2 μV/V (type A).