A high frequency model of toroidal chokes for EMC filtering

Felix Traub, B. Wunsch, S. Skibin
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引用次数: 8

Abstract

Chokes are crucial in power electronics applications to block the propagation of high-frequency disturbances produced in switching events. At high frequencies, the real behavior of a choke can differ significantly from its nominal behavior due to the frequency-dependency of core materials and due to parasitic couplings introduced by the windings. This paper presents an accurate, versatile, and computationally efficient method to compute the parasitic couplings and predict the frequency-dependent impedance of the choke. Comparison with measurements of sample chokes with ferrite and nanocrystalline cores show excellent agreement in the entire EMC frequency range of 150 kHz to 30 MHz. Multiple self-resonances of the choke can be correctly described.
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用于电磁兼容滤波的环形扼流圈高频模型
扼流圈在电力电子应用中是至关重要的,它可以阻止开关事件中产生的高频干扰的传播。在高频率下,由于磁芯材料的频率依赖性和绕组引入的寄生耦合,扼流圈的实际行为可能与其标称行为有很大不同。本文提出了一种精确、通用、计算效率高的方法来计算寄生耦合和预测扼流圈的频率相关阻抗。与铁氧体和纳米晶磁芯样品扼流圈的测量结果相比,在150 kHz至30 MHz的整个EMC频率范围内具有良好的一致性。可以正确地描述扼流圈的多个自共振。
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