Performance analysis and development of high-power and high-linearity current injection probes
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摘要: 针对大电流注入探头应用于大电流注入等效强场电磁辐射试验时阻抗容易发生非线性变化的问题，通过分析大电流注入的方式，对现有的商品化电流探头进行了线性度测试。测试结果表明，注入功率增大，不同频点的线性误差也随之增大。提出了研制大功率高线性度电流探头的方案，进行研制并通过了测试。自行研制的电流注入探头最大耐受功率可达500 W，插入损耗随注入功率变化具备良好的线性度0.3 dB @ 1−500 W，可以满足开展大电流注入等效强场电磁辐射效应试验的技术需求。Abstract: Aiming at the problem that the impedance of the probe is prone to non-linear changes when applied to the bulk current injection test replacing high field intensity radiation, the linearity test of the existing commercial current probe is carried out by analyzing the method of large current injection. The test results show that as the injected power increases, the linearity error at different frequencies also increases. A plan for the development of a high-power and high-linearity current probe was proposed, and the probe was developed and passed the test. The self-developed current injection probe has a maximum withstand power of 500 W. The insertion loss varies with the injected power and has good linearity (0.3 dB @ 1−500 W). The probe can meet the technical requirements of carrying out bulk current injection (equivalent high field electromagnetic radiation effect) test.
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Key words:
- current injection probe /
- high power /
- high linearity /
- nonlinear change /
- electromagnetic radiation
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图 2 平行双线差模注入等效电路
Figure 2. Equivalent circuit of parallel two-wire differential mode injection
图 9 磁芯及电流注入探头外壳的结构设计
Figure 9. Cross-sectional structure design of magnetic core and current injection probe shell
图 10 自行研制电流注入探头相关尺寸
Figure 10. Relevant dimensions of the self-developed current injection probe
图 12 电流注入探头性能测试实物配置
Figure 12. Physical configuration of current injection probe performance test
图 13 自研电流注入探头插损曲线
Figure 13. Insertion loss curve of the self-developed current injection probe
图 14 自研电流注入探头插损测试结果
Figure 14. Test result of the self-developed current injection probe’s insertion loss
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