Journal of South China University of Technology (Natural Science Edition) ›› 2008, Vol. 36 ›› Issue (8): 75-78.

• Mechanical Engineering • Previous Articles     Next Articles

Ultrashort Pulse Power Supply Applied to Micro-ECM and Corresponding Technique Experiments

Liu Xiao-kang1  Li Feng2   

  1. 1. School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China; 2. Faculty of Material and Energy, Guangdong University of Technology, Guangzhou 510006, Guangdong, China
  • Received:2007-09-06 Revised:2007-11-15 Online:2008-08-25 Published:2008-08-25
  • Contact: 刘小康（1959-），女，副教授，主要从事微细加工技术研究． E-mail:liuxk58@scut．edu．cn
  • About author:刘小康（1959-），女，副教授，主要从事微细加工技术研究．
  • Supported by:

    国家自然科学基金资助项目（50675036,50475046）;广东省科技计划项目（2005810201007）

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Abstract:

Pulse power supply is one of the key components of high-accuracy micro-electrochemical machining （ECM）. In this paper, a nanosecond ultrashort pulse power supply for micro-ECM is designed and fabricated, with a minimum stable pulse width of lOOns and a rated current of 1A. In the developed power supply with independent duty-cycle and frequency adjustments, the scheme of DC-plus-chopper is adopted; an integrated block is employed to adjust the DC voltage; and a high-frequency signal generator with wide working frequency is used to provide the chopper with driving waveform possessing nano-second rise time and fall time. A complementary MOSFET is applied to the chopper circuit to avoid the waveform distortion during the machining. Moreover, a fast over-currentprotection circuit is designed according to the characteristics of micro-ECM to ensure the machining accuracy. The effectiveness of the developed power supply is finally verified by the machining experiments of some typical micro parts.

Key words: ultrashort pulse power supply, nanosecond pulse, micro-electrochemical machining, chopping