Traditional noncontact rigid probes fail to meet the time-domain reconstruction requirements inside industrial modules in an enclosed chamber. In this article, a flexible current probe is proposed as a diagnosis tool to extend the noninvasive time-varying current reconstruction technology inside an industrial PWM-chopper module in an enclosed chamber. The flexibility of the probe allows for direct placement on trace surfaces or attachment to trace sides for current measurement without intrusion. Reflection coefficient curves obtained at typical bending angles demonstrate remarkable consistency with an average error of 0.63%. Furthermore, time-domain curves of reconstructed currents closely match directly measured currents with an average error below 0.24%. The flexible probe demonstrates consistent and stable performance across different bending levels in noninvasive current measurement tests. In the application tests, the experimental results validate its utility as a diagnostic tool for noninvasive time-varying current detection within an industrial PWM-chopper module, achieving an average error below 0.11%. Additionally, the proposed probe enables the detection of varying output currents for load failure analysis in constant voltage output modules.

中文翻译：

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无创柔性电流探头作为 PWM 斩波器模块内部的诊断工具

传统的非接触式刚性探头无法满足封闭室内工业模块内部的时域重构要求。在本文中，提出了一种柔性电流探头作为诊断工具，以扩展封闭室内工业 PWM 斩波器模块内的无创时变电流重建技术。探头的灵活性允许直接放置在迹线表面上或连接到迹线侧面以进行电流测量而无需侵入。在典型弯曲角度下获得的反射系数曲线表现出显着的一致性，平均误差为0.63%。此外，重建电流的时域曲线与直接测量的电流非常匹配，平均误差低于 0.24%。在无创电流测量测试中，柔性探头在不同弯曲水平下表现出一致且稳定的性能。在应用测试中，实验结果验证了其作为工业 PWM 斩波模块内无创时变电流检测的诊断工具的实用性，平均误差低于 0.11%。此外，所提出的探头能够检测变化的输出电流，以进行恒压输出模块中的负载故障分析。