Sungbin Cho, Bonghyun Cho, Kyungmun Lee, Suhong Ryu, Jiho Lee
언어
영어(ENG)
URL
https://www.earticle.net/Article/A483880
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원문정보
초록
영어
In this study, a high-precision isolated data acquisition (DAQ) system is designed for stable measurement of low-level voltages under high voltage common-mode environments. The proposed DAQ system is designed to employ a 24-bit Σ-Δ analog-to-digital converter, a sampling rate exceeding 1 kS/s, measurement accuracy of approximately ±0.01%, a common-mode rejection ratio (CMRR) exceeding 130 dB, and channel-to-channel isolation of ±500 Vrms. Notably, the importance of channel-to-channel isolation is experimentally verified. The results demonstrate that the absence of isolation can result in spurious voltage signals in both the specific DAQ system and other systems connected to the same measurement environments. A hybrid filtering structure is adopted to simultaneously acquire raw and filtered signals. During measurement, filtered data is used for real-time monitoring, while the stored raw data is post-processed to obtain distortion-free data. Theoretical analysis of infinite impulse response (IIR) and zero- phase filters indicate that IIR filtering causes nonlinear phase response and frequency-dependent group delay, leading to signal distortion, whereas zero-phase filtering eliminates such distortion. Based on the analysis, a post-processing-based zero-phase filtering approach is adopted. The proposed DAQ system is applicable to high temperature superconducting (HTS) magnet quench detection, cell level voltage monitoring in electric vehicle (EV) battery packs, and other high-reliability power and energy systems requiring precise low-level voltage measurements.
목차
Abstract 1. 서론 2. DAQ 시스템의 목표 사양 2.1 채널 간 절연 및 절연 내압 2.2 ADC 비트 수 및 분해능 2.3 샘플링 속도 2.4 측정 정확도 및 공통 모드 제거 성능 3. DAQ 시스템의 특징 및 구성 4. 결론 ACKNOWLEDGMENT REFERENCES