Development of a High-Frequency Discharge Power Source with Non-Equal Energy Relaxation Oscillator Circuit Applied to β-Ga2O3 Microstructure Array Wire Electric Discharge Machining

Shun Tong Chen*, Shih Yao Chen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

A high-frequency discharge power source with non-equal energy relaxation oscillator circuit is proposed in this study. An experiment based on gallium oxide (Ga2O3) and an aluminum alloy microstructure array is devised to verify the machining performance of the power source. Signals are sent by a field-programmable gate array (FPGA) for the control of an N-MOSFET load switch, thus determining when the power source charged and discharged to generate a discharge waveform with narrow pule width and alternating high and low peaks. Compared to a conventional RC discharge circuit, the proposed design generated a pulse train with a regular and dense pattern and created high-density and tiny-energy high-temperature plasma. The experiment was performed with a high-frequency discharge energy pulse train designed with alternating high and low-peaks to examine the machining performance of the discharge source for pyrolytic Ga2O3 material including: the best-fit capacitance combination, feed-rate of wire-electrode, material removal rate, kerf width and spark erosion capability. The experiment’s results revealed that the design high-frequency relaxation oscillator circuit successfully generated surface microstructure arrays and pillared microstructure with outstanding dimensional accuracy and consistence. Clearly, the application of the proposed high-frequency power source proposed performed admirably in spark erosion in addition to its high-efficiency, -controllability, and -stability, and it prevented thermal damage to microstructures. The workpiece’s polarity, surface roughness, material removal mechanism, surface degenerating layer and discharging performance of metal and semiconductor are analyzed both quatitatively and qualitatively.

Original languageEnglish
Pages (from-to)1511-1528
Number of pages18
JournalInternational Journal of Precision Engineering and Manufacturing - Green Technology
Volume10
Issue number6
DOIs
Publication statusPublished - 2023 Nov

Keywords

  • Non-equal energy
  • Pyrolysis
  • Relaxation oscillator circuit
  • Spark erosion capability

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • General Materials Science
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Management of Technology and Innovation

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