Research on theoretical model of bulk current injection replacing radiation about shielded two-core wire
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摘要: 针对大范围空间模拟强场电磁环境进行辐射效应试验难度大以及现有大电流注入（BCI）技术应用于非线性系统试验存在空白的问题，开展了屏蔽线耦合通道BCI等效替代辐照试验方法研究。以受试设备响应相等作为等效依据，建立了辐照法和注入法两种条件下受试设备响应的分析模型，推导出了注入激励源电压与辐照场强之间的等效对应关系，提出了BCI等效替代辐照的条件和试验方法，并进行了试验验证。研究结果表明，BCI方法是可以精确等效受试设备的辐照效应试验，试验误差不超过2 dB，能够满足工程的实际需求。Abstract: Large-scale space simulation of high field intensity electromagnetic environment is difficult to test radiation effects, and there are gaps in the application of existing BCI (bulk current injection) technology to nonlinear system tests. The research on the equivalent alternative radiation test method of the shielded cable coupling channel is carried out. Taking the equal response of the tested equipment as the equivalent basis, an analysis model of the response of the EUT (equipment under test) under the two conditions of radiation method and injection method is established. The equivalent corresponding relationship between the injection excitation source voltage and the radiation field intensity is deduced, and the conditions and test methods for the equivalent replacement of radiation with BCI are proposed and verified by experiments. The research results show that the BCI method can be accurately equivalent to the radiation effect test of the EUT, and the test error does not exceed 2 dB, which can meet the actual needs of the project.
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图 2 注入条件下屏蔽线外部电路模型
Figure 2. External circuit model of shielded wire under injection condition
图 3 注入条件下屏蔽线内部原始电路
Figure 3. Internal origin circuit of shielded wire under injection condition
图 4 注入条件下屏蔽线内部转换电路
Figure 4. Internal convertible circuit of shielded wire under injection condition
图 6 源为左部分时的戴维南等效电路
Figure 6. Thevenin equivalent circuit when the source is the left part
图 7 源为左部分时的最终戴维南等效电路
Figure 7. Final Thevenin equivalent circuit when the source is the left part
图 8 注入条件下屏蔽线内传输线电路
Figure 8. Transmission line circuit in shielded line under injection condition
图 9 屏蔽线BCI等效替代辐照试验方法
Figure 9. Shielded wire BCI equivalent substitute irradiation test method
表 1 实验结果
Table 1. Results of tests
frequency/MHz P1/dBm P2/dBm E0/（V/m） k P3/dBm P4/dBm E1/（V/m） 69 28.5 26.7 4.2 −14.2 47.8 46 35.2 70 29.2 28.8 4.3 −16.1 48 47.4 34.9 110 31.3 20.5 4.7 −7.1 57.8 48.6 97.8 170 37.4 22.8 21.5 3.85 56.3 42.4 188.8 370 36.6 16.1 4.7 −2.7 48.6 29.3 20.8 390 34.2 18.7 4.1 −6.4 45.7 30.7 17.4 
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表 2 实验误差
Table 2. Errors of tests
frequency /MHz error/dB 69 −0.76 70 −0.42 110 −1.77 170 −0.73 370 −0.30 390 0.56
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