全固态双极性纳秒脉冲电源研制及应用

研制了一种双极性交替的纳秒高压脉冲电源，进行了双极性纳秒脉冲放电产生等离子体研究。该电源先通过固态开关IGBT将直流电压截断成电压脉冲，通过可饱和脉冲变压器拓扑，实现升压并缩短脉冲上升沿。该电源可在一个周期内输出极性相反的2个脉冲，且时序可以灵活控制。通过优化调整器件参数，研制了两种不同输出性能参数的双极性纳秒脉冲电源：①峰值电压10 kV、爆发模式脉冲重复频率500 kHz（正负脉冲间隔2 μs）、连续重复频率1 kHz；②峰值电压25 kV、爆发重频200 kHz、连续重频600 Hz。测试电源的运行性能，发现电源存在温度升高的情况，但长时间（＞0.5 h）运行温度趋于稳定。10 kV电源连续运行在1 kHz时最高温度点50.5 ℃；25 kV电源连续运行在600 Hz时最高温度点60 ℃。利用该电源驱动线板电极阵列和表面介质阻挡放电结构，证实了该电源可以用于常压空气条件下产生大面积等离子体。

Development and application of all-solid-state bi-polar nanosecond pulse generators

A nanosecond pulse generator with alternating output voltage polarity is developed, and the study of plasma generated by bipolar nanosecond pulse discharge is carried out. The generator first cuts DC voltage into a voltage pulse through solid-state switches IGBT, and uses a saturable pulse transformer to boost the voltage and shorten the pulse rising edge. The generator can output two pulses with opposite polarities in one cycle, and the timing can be flexibly controlled. By choosing devices with proper parameters, two bipolar nanosecond pulse generators with optimized output parameters are developed: ① The peak voltage is 10 kV, and the pulse repetition frequency in burst mode is 500 kHz (interval between positive and negative pulses is 2 μs), with continuous repetition frequency of 1 kHz; ② The peak voltage is 25 kV, with 200 kHz burst frequency, and the continuous frequency is 600 Hz. The operating performance of the generators is tested, and it is found that the temperature of the generators tends to increase to a stable point during long-duration(more than half an hour) operation. When the 10 kV generator continuously works at 1 kHz, its highest temperature is 50.5 ℃. For the 25 kV generator continuously working at 600 Hz, the highest temperature point is 60 ℃. The result of using the generators to drive the wire-to-plate electrode and the surface dielectric barrier discharge proves that the generators can be used to generate large-area plasma in atmospheric air.