Reducing Parasitic Oscillations of Capacitive Dividers Using Coaxial Symmetry in the Low-Voltage Arm
Year: 2025
Type: article
Abstract: In this paper, a new design rule to mitigate parasitic oscillations superimposing to the measurement of high-voltage pulses is proposed. We establish a transfer function of capacitive dividers that includes not only the self inductances of the high and low-voltage arms of the divider but also the mutual inductance that exists between both arms of the dividers. Mathematical analysis and experimental validation demonstrate that the parasitic oscillations can be significantly reduced by using a coaxial configuration of the low-voltage arm printed circuit board (PCB). The proposed design rule can be implemented on any capacitive divider, enabling a compact low-voltage side design, whose voltage division factor can be conveniently modified. In this work, the design rule is validated on a custom-built capacitive divider, designed to measure high-voltage pulses generated by spiral generators. The designed capacitive divider successfully measured pulses up to 289 kV with a voltage division factor exceeding 100,000 with minimal parasitic oscillations.
Authors: Thor Wens, Jean-François Fagnard, Philippe Laurent, Christophe Greffe, Philippe Vanderbemden
Institution: University of Liège
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
Funder: Service Public de Wallonie
OpenAlex ID: W4410986293