Design of high-frequency narrow-pulsed inverter power supply for micro-arc oxidation

作者：Yang, Kai; Cao, Biao; Ding, Li; Yang, Guang; Huang, Zeng-Hao

来源：Journal of South China University of Technology(Natural Science Edition), 2014, 42(9): 18-23.

DOI：10.3969/j.issn.1000-565X.2014.09.004

• Co-operative control
• Load characteristics
• Microarc oxidation
• Narrow pulse
• Power supply

In order to enhance the arc controllability during the MAO (Micro-Arc Oxidation) process, a high-frequency narrow-pulse inverter power supply for micro-arc oxidation is designed in the perspective of pulse energy control. This power supply adds an impedance matching circuit to the main circuit of the source on the basis of a traditional two-stage inverter structure. Thus, rapidly releasing and storing of energy in the circuit and load is realized under the variable polarity mode. Then, a cooperative control strategy is presented to carry out DC/pulsed/variable polarity pulsed modes, and the corresponding operation patterns for the main circuit are also described. Finally, the load characteristic of the proposed power supply is analyzed and the availability of the equivalent model of the load characteristic is verified by comparing simulation and experimental waveforms. Experimental results demonstrate that, for the proposed power supply, both increasing the pulse frequency (up to 20 kHz) and decreasing the pulse width (low to 20 μs) help to realize the precise control of pulse energy and enhance the energy utilization of the system, and both the porosity and surface roughness of the coating obtained in the high-frequency narrow-pulse mode are lower.

• 出版日期2014-9-1
• 单位华南理工大学