Establishing an equivalent circuit for a quasihomogeneous discharge atmospheric-pressure plasma jet with a breakdown-voltage-controlled breaker and power supply circuit

Shih Sen Huang, Hsing Che Tsai, Jerry Chang, Po Chun Huang, Yun-Chien Cheng*, Jong-Shinn Wu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

To more accurately simulate the I-V diagram of a homogeneous and a filamentary plasma discharge with an equivalent circuit model, this study employed a breaker and passive circuit components and calculated the discharge parameters, such as equivalent discharge resistances and potential distribution, in an atmospheric pressure plasma jet (APPJ). In addition, we calculated the gas-gap and dielectric capacitances of the APPJ and added a power supply equivalent circuit. Compared with other circuit models that use switches or a time-controlled current source to simulate the discharges, our present circuit model uses a breakdown-voltage-controlled breaker for the homogeneous discharge and resistors with high-frequency switches for the filamentary discharge. We employed potential simulation to obtain the equivalent dielectric capacitance in the APPJ and then derived the gas-gap capacitance. We also replaced the ideal sine wave power supply with the equivalent circuit of the common double-peak waveform power supply. MATLAB Simulink was used to construct an equivalent circuit model and the discharge area ratio, breakdown voltage and filamentary equivalent resistance were obtained via I-V waveform fitting. We measured the plasma I-V waveform with a 20 kHz frequency, various voltages (6, 12 and 15 kV), a gas flow rate of 30 standard liter per minute (SLM) and two types of gas (Ar and He). The simulated and experimental I-V waveforms were very close under the different conditions. In summary, the proposed equivalent circuit model more meaningfully describes the plasma physics to simulate homogeneous and filamentary discharges, achieving results that are compatible with our experimental observations. The findings can help with investigating plasma discharge mechanisms and full-model simulations of plasma.

Original languageEnglish
Article number215204
Pages (from-to)1-13
Number of pages13
JournalJournal of Physics D: Applied Physics
Volume55
Issue number21
DOIs
StatePublished - 26 May 2022

Keywords

  • argon plasma
  • atmospheric plasma jet
  • dielectric barrier discharge
  • equivalent circuit
  • filamentary discharge
  • helium plasma
  • homogeneous discharge

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