为增强微弧氧化过程中电弧的可控性， 从脉冲能量控制角度， 设计了一种逆变式高频窄脉冲微弧氧化电源． 该电源在传统的两级逆变电路结构基础上， 增加了阻抗匹配电路， 实现了变极性模式下回路及负载中能量的快速释放与存储． 文中还详述了实现多种模式输出的协同控制策略及对应的电路工作模式， 分析了电源的负载特性， 并通过仿真和实验波形验证了该负载特性等效模型的有效性． 实验结果表明， 通过提高电源输出脉冲频率( 最高 20 kHz) 及减小脉冲宽度( 最窄 20 μs) ， 可实现对脉冲能量的精密控制和提高系统的能量利用率; 高频窄脉冲处理模式获得的膜层表面孔隙率和表面粗糙度更低．

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