To address the issue of inaccurate high-frequency voltage signal measurements in the military and power industries, and to further enhance the measurement capabilities of high-frequency pulse voltage, this paper proposes a capacitive voltage divider technique based on wave impedance matching. First, it introduces the theory and role of wave impedance matching in measurement circuits. Next, the design process of a capacitive voltage divider based on wave impedance matching is described, taking into account the distributed parameters of the divider and conducting circuit simulations. Finally, a step wave response test is conducted on the developed 200 kV capacitive voltage divider to verify its wide-frequency measurement capabilities. The results show that the capacitive voltage divider designed with wave impedance matching has a step wave stabilization time of less than 200 ns in the response test. The step wave quickly stabilizes after passing through the voltage divider and matches the theoretical calculations. Compared to a voltage divider not designed with wave impedance matching, the stabilization time improves by at least 100 ns, achieving accurate measurement of higher frequency transient voltage signals.

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Research on Capacitance Voltage Divider Technology Based on Wave Impedance Matching

  • Hu Kangmin,
  • Long Zhaozhi,
  • Diao Yinglong,
  • Li Wenting,
  • Fan Jiawei,
  • Yue Weipeng,
  • Zhou Feng,
  • Wang Zhehao

摘要

To address the issue of inaccurate high-frequency voltage signal measurements in the military and power industries, and to further enhance the measurement capabilities of high-frequency pulse voltage, this paper proposes a capacitive voltage divider technique based on wave impedance matching. First, it introduces the theory and role of wave impedance matching in measurement circuits. Next, the design process of a capacitive voltage divider based on wave impedance matching is described, taking into account the distributed parameters of the divider and conducting circuit simulations. Finally, a step wave response test is conducted on the developed 200 kV capacitive voltage divider to verify its wide-frequency measurement capabilities. The results show that the capacitive voltage divider designed with wave impedance matching has a step wave stabilization time of less than 200 ns in the response test. The step wave quickly stabilizes after passing through the voltage divider and matches the theoretical calculations. Compared to a voltage divider not designed with wave impedance matching, the stabilization time improves by at least 100 ns, achieving accurate measurement of higher frequency transient voltage signals.