Compact all-solid-state high frequency LC-Marx generator based on magnetic switch
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摘要: 通过理论、模拟和实验对提出的全固态LC-Marx发生器进行研究。整个系统由一个MOSFET开关和多个由一个磁芯制成的磁开关控制，该脉冲发生器直径为140 mm，高为17 mm，且随着级数的增加尺寸和重量基本不变。运用谐振充电可以使电容充到源电压的1.82倍，五级LC-Marx发生器用950 V直流电压充电时，在500 Ω电阻上得到峰值电压为10.9 kV、半高宽为400 ns、上升时间为85 ns、效率为30.43%的高压脉冲。输出电压的上升前沿可以根据实际应用的要求，通过减小电容量缩短。该脉冲发生器在频率低于30 kHz下，可以持续稳定地运行。该LC-Marx脉冲发生器在气体放电中将具有较好的应用效果。Abstract: An all-solid-state LC-Marx generator based on magnetic switch has been proposed and analyzed by theory, simulation and experiment. This system is controlled by 1 MOSFET and magnetic switches that are made by 1 magnetic core. It has dimensions of 130 mm (diameter) and 60 mm (height), which almost not change with the stage increase. The capacitors could be charged to 1.82 times source voltage according to the principle of resonant charging. Five-stage LC-Marx generator could obtain a peak output voltage of −10.9 kV with rise time of 80 ns when the source voltage of 950 V is applied, and the energy efficiency is 30.43% on 500 Ω. The generator has been tested under 30 kHz that could work steadily. It could output higher voltage when used for atmospheric discharge.
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Key words:
- LC-Marx /
- pulsed power generator /
- magnetic switch /
- MOSFET /
- resonant charging /
- all-solid-state /
- high frequency /
- atmospheric discharge
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图 1 基于磁开关的LC-Marx发生器电路原理图
Figure 1. Circuit diagram of the proposed LC-Marx generator based on magnetic switches
图 3 五级LC-Marx发生器奇数电容电压、偶数电容电压以及负载电压
Figure 3. Simulated odd number capacitors’ voltage (UO), (U) even number capacitors’ voltage (UE) and output voltage of 5-stage LC-Marx generator
图 4 基于磁开关的五级LC-Marx发生器实物图
Figure 4. Photograph of the produced five-stage LC-Marx generator
图 5 奇数电容电压、偶数电容电压以及负载电压
Figure 5. Odd number capacitors’ voltage, even number capacitors’ voltage and output voltage of experiment
图 6 一级到五级LC-Marx发生器输出的电压波形
Figure 6. Output voltage of 1～5 stage LC-Marx generator at 950 V charging voltage
图 7 五级LC-Marx发生器在30 kHz时输出的电压波形
Figure 7. Output voltage of 5-stage LC-Marx generator under 30 kHz
图 9 大气条件下放电下的电压波形和电流波形
Figure 9. Voltage and current for the discharge load shown in Fig. 8
表 1 开关及其驱动的主要器件
Table 1. Major components of the switch and the driver
component manufacturer model specifications power MOSFET IXYS DE475-102N21A 1000 V
140 Adriver chip IXYS IXRFD630 8～30 A，30 A optical modules Hitachi DS9300，DR9300 DC～50 Mb/s isolated DC-DC converters Murata NMJ0515SAC，NMJ0515SAC 5 V(in)/15 V(out)
5 V(in)/5 V(out)
1 W
isolation volt: 5 kV
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