微空心阴极放电试验用软开关电源的研究

微空心阴极放电（MHCD）是在普通空心阴极放电的基础上提出的一种高气压下亚毫米级微放电技术.将MHCD作为大体积辉光放电的外部电离源（即等离子体源）,可以解决高气压下大体积辉光放电不稳定的问题.在MHCD实验的基础上,研制出可对MHCD气体放电模式（连续/脉冲）和输出功率进行调控的开关电源.这种开关电源可以与单片机、微机等其他外部控制设备相连.该电源采用全桥软开关技术,串联谐振并联输出,4个MOSFET管为主控制元件,实现了高频工作,响应快速.脉冲模式工作时避免了开关管的硬开关,减小了高次谐波对电网干扰;无需镇流电阻也可实现气体稳定放电.

MHCD experiment soft-switching power supply

Micro-hollow cathode discharge(MHCD) is a newly advanced micro-discharge technique based on ordinary cathode discharge in a sub-millimeter level micro-hollow under high pressure.MHCD can be used as plasma cathodes for the large-volume high-pressure glow discharge to solve the instability of glow discharge.On the basis of the MHCD experiments,the switching power supply was designed that can control the gas discharge mode of MHCD(cw /pulse) and adjust the output.This switching power supply can be connected with external control equipments,the micro-controller,the computer,etc.In the design of the power supply,the main circuit topology frame uses full-bridge series resonant switching and parallel load connection.In this connection,four MOSFETs are adopted as the power switches,and the connection high operation frequency and fast response are realized.In addition,the MOSFET in the switching power supply has no hard turn-on or turn-off situation in transition,thus the disturbance to the power system is avoided.In particular,the switching power system can provide a steady discharge current without any amperite.