Abstract
A novel micro-arc oxidation power supply with high and low frequency coupled pulse was presented, which was proposed to improve the performance of the fabricated ceramic coatings. The micro-arc oxidation power supply was composed of the human machine interface, the main control board, the three-phase SCR driving circuit, the main circuit power device and the cooling system. The inputting of parameters and the monitoring of power supply process were realized by HMI. The ARM of main control board was communicated via USB to RS232. The voltage regulating part of the main circuit was driven by three-phase SCR to adjust the voltage value during the micro-arc oxidation process. The load test shows that the power supply was realized the output of coupled pulse, and the coatings was smooth which prepared by coupled pulse.
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