脉冲电流测试电压测量装置中的寄生磁耦合

O. Kerfin, T. Kopp, M. Kurrat
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引用次数: 1

摘要

脉冲电流测试的电压测量装置必须处理无意中耦合到测试探头中的磁场。因此,感应电压会导致对测量电压曲线的误读,这对于像浪涌保护装置(SPD)这样的元件的整个开发过程是必不可少的。为了研究磁耦合的影响,实现了一个由浪涌电流发生器和代表被测设备(DUT)的导体布置组成的测试装置。专门为研究设计的带有不同导体回路的印刷电路板(PCB)用作探头,测量导体上的电压降。此外,导体回路提供了定义良好的耦合行为。为了评估导体回路面积对感应电压的影响,可以调节磁通穿过的面积。此外,通过改变注入的脉冲电流来分析各自电流值对测量装置中寄生耦合的影响。为了更深入地了解磁耦合行为,对测试装置进行了场模拟。通过实测验证了参数化仿真模型的有效性。在进一步的研究中,由于在仿真过程中可以单独考虑寄生感应电压,因此所获得的结果可用于更精确地确定整个被测件的电压降。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Parasitic Magnetic Coupling in Voltage Measurement Setups for Impulse Current Tests
Voltage measurement setups for impulse current tests have to deal with the unintended coupling of magnetic fields into the test probes. As a result induced voltages can lead to a misinterpretation of the measured voltage curve which is essential for the whole development process of components like surge protective devices (SPD). To investigate the influence of the magnetic coupling a test setup, consisting of a surge current generator and a conductor arrangement representing the device under test (DUT), is implemented. A printed circuit board (PCB) with different conductor loops specifically designed for the investigation is used as a probe to measure the voltage drop across the conductor. Additionally, the conductor loops provide a well-defined coupling behaviour. The area which is permeated by the magnetic flux can be adjusted in order to evaluate the influence of the conductor loop-area on the induced voltage. Furthermore, the injected impulse current is varied to analyse the effect of the respective current value on the parasitic coupling in the measurement setup. For a deeper understanding of the magnetic coupling behaviour a field simulation of the test setup is carried out. The parametrised simulation model is validated by the respective measurements. In further studies the obtained results could be used for a more exact determination of the voltage drop solely across the DUT due to the fact that the parasitic induced voltages can be considered separately in the simulation process.
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