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为了确保模块化脉冲功率电源中的充电电源在脉冲成形网络(PFN)大电流放电时能正常工作,必须对充电电源的控制电路、检测电路等受到的辐射干扰及其抑制措施进行分析和研究。通过有限元数值分析软件Ansoft Maxwell对集成了充电电源、储能电容和脉冲成形网络的模块化脉冲功率电源进行了3维实体建模和电磁场仿真研究。结果表明:材质电导率和磁导率越大,机壳屏蔽效能(SE)越好;当机壳上开孔为圆阵孔时,屏蔽效能优于其他等面积的孔的屏蔽效能;当机壳厚度接近趋肤深度时,屏蔽效能变化较小;当机壳内印刷电路板(PCB)平行于调波电抗时,受到干扰最小。
In order to ensure that the charging power supply in the modular pulsed power supply can work normally during PFN large current discharge, it is necessary to analyze and study the radiation interference and control measures of the control circuits and detection circuits of the charging power supply. The finite element numerical analysis software Ansoft Maxwell was used to conduct 3-D solid modeling and electromagnetic field simulation of a modular pulsed power supply with integrated charging power supply, storage capacitor and pulse shaping network. The results show that the greater the conductivity and permeability of the material, the better the shielding effectiveness (SE) of the casing; the shielding effectiveness of the casing is better than those of other equal holes when the casing is a circular hole; When the thickness of the shell is close to the skin depth, the shielding effectiveness changes little; when the PCB in the chassis is parallel to the reactance of the modulating wave, the interference is minimal.