大电流注入探头与机载屏蔽线缆耦合解析模型

doi:10.7527/S1000-6893.2022.27053

Abstract

Abstract:

The Bulk Current Injection （BCI） method is the standard test method for conducted immunity test of airborne equipment. Exploring the coupling mechanism between the BCI injection probe and the interconnecting cable of airborne equipment is very important to further expand the conducted immunity test capability. However， there is barely comprehensive analytical model to describe the coupling mechanism between the injection probe and the shielded cable. Firstly， a lumped parameter model is established according to the structural characteristics of the injection probe， and the relative permeability and parasitic parameters such as inductance and capacitance are obtained by measuring the reflection coefficient with open-circuit termination. The equivalent circuit of the injection probe is constructed according to Thevenin's theorem. Then， according to the spatial structure relationship between the injection probe and the shielded cable， the coupling and uncoupling sections are defined， and the respective chain-parameter equations are established and cascaded to gain the overall chain-parameter equation. Finally， the coupling analytical model of the BCI injection probe and the shielded cable is formed based on the termination equations. At the same time， the scattering parameters of the multi-port network formed by the injection probe and the shielded cable are tested based on the experimental platform. The accuracy of the analytical model is verified by comparing the terminal coupling voltage of the shielded cable. The results show that the error between the model and the experimental results is less than 3 dB from low frequency to resonance point， and the model can effectively describe the coupling mechanism between the injection probe and the shielded cable.

Key words: Bulk Current Injection (BCI), shielded cable, lumped parameter, chain-parameter, transmission line theory

CLC Number:

V240.3

Hongxu ZHAO, Haiyang SHEN, Ye CHEN, Xudong SHI. Coupling mechanism between bulk current injection probe and airborne shielded cable[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2023, 44(6): 327053-327053.

Figures/Tables 12

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References 23

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参数	数值
金属外壳外径/mm	64.5
金属外壳内径/mm	20
磁芯外径/mm	53
磁芯内径/mm	32
磁芯宽度/mm	57
金属外壳宽度/mm	70
绕组截面长度a/mm	7
绕组截面宽度b/mm	1
金属外壳厚度/mm	3

参数	数值
线长（360°端接）/mm	1 200
线芯半径（360°端接）/mm	0.24
屏蔽层外径（360°端接）/mm	0.99
绝缘层外径（360°端接）/mm	1.25
线长（引线端接）/mm	1 200
线芯半径（引线端接）/mm	0.24
屏蔽层外径（引线端接）/mm	0.99
绝缘层外径（引线端接）/mm	1.25
屏蔽层剥线长度（引线端接）/mm	70
引线长度（引线端接）/mm	90

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Coupling mechanism between bulk current injection probe and airborne shielded cable

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