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脉冲功率电源会产生很强的辐射电磁干扰,特别是在电源电抗器附近场强很大,其产生的电磁场会直接影响电源附近测控设备以及工作人员的安全。为了有效控制电源电抗器附近干扰水平,对其电磁场进行了屏蔽试验,同时在理论分析和数值计算的基础上,结合试验数据进行了分析研究。首先设计了板式屏蔽结构,屏蔽板采用双层板结构,材料分别为硬铝和冷轧钢;用有限元方法分别计算了单层和双层板的屏蔽效果,兼顾其对原有电路参数的影响,获得了屏蔽板的结构与材料参数;然后,试验测量了屏蔽效果,并与仿真结果进行了对比分析。结果表明,高电导率材料起主要屏蔽作用,而采用的低电导率材料主要起到结构支撑作用,即铝制板对屏蔽效果的贡献最大;仿真和试验结果均表明,屏蔽后磁场峰值衰减1个数量级,因此提出的屏蔽方案能够有效抑制电源电抗器前干扰水平。
Pulsed power supply will produce strong radiated electromagnetic interference, especially in the vicinity of the power reactor field strength, the electromagnetic field generated will directly affect the power supply near the monitoring and control equipment and staff safety. In order to effectively control the interference level near the power reactor, the electromagnetic field of the reactor was shielded. At the same time, based on the theoretical analysis and numerical calculation, the experimental data were analyzed. First, the design of the plate-type shield structure, the shield plate with double-deck structure, the material is duralumin and cold-rolled steel; finite element method were calculated single and double shield effect, taking into account its original circuit parameters The structure and material parameters of the shielding plate are obtained. Then, the shielding effect is measured and compared with the simulation results. The results show that the material with high conductivity plays a major shielding role, while the material with low conductivity mainly plays the role of structural support, ie the aluminum plate has the largest contribution to the shielding effect. The simulation and experimental results show that the peak value of the shielding magnetic field attenuates by 1 Therefore, the proposed shielding scheme can effectively suppress the level of interference before the power reactor.