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Piezoelectric EMI Filter for Switched-Mode Power Supplies
IEEE Transactions on Power Electronics ( IF 6.7 ) Pub Date : 2020-12-08 , DOI: 10.1109/tpel.2020.3043091
Florian Hubert , Philipp Dorsch , Daniel Kuebrich , Thomas Duerbaum , Stefan J. Rupitsch

We introduce a novel electromagnetic interference suppression method based on the piezoelectric effect for switch-mode power supplies (SMPSs). A piezoelectric interference-suppression component (PISC) generates a low-impedance propagation path for conducted emissions at its resonance frequency. This results in an attenuation of a discrete disturbance peak. Besides the resonance frequency, the PISC features capacitive behavior. Thus, PISCs can not only substitute regular capacitors (e.g., Y-capacitors), but also provide selective attenuation at discrete frequencies. Moreover, PISCs have the potential to reduce size, weight, and cost of SMPSs because the filter size can be reduced while still fulfilling electromagnetic interference regulations through the use of the PISC. We proof this concept by integrating the PISC in a flyback converter and investigate the attenuation of the common-mode disturbance. In addition, the influence of frequency shifts for the circuitry and the PISC is evaluated. In our measurements, the PISC suppresses a discrete disturbance peak at the switching frequency by 45 dB, which was found to be 17 dB better than the conventional approach. Furthermore, determining factors for a proper usage in SMPS, such as temperature dependence, safety ratings, etc., were examined, and an appropriate design procedure is given. Finally, typical application scenarios for PISCs are described.

中文翻译:

用于开关电源的压电EMI滤波器

我们介绍了一种基于压电效应的新型电磁干扰抑制方法,用于开关电源(SMPS)。压电干扰抑制组件(PISC)产生低阻抗传播路径,用于在其谐振频率下传导发射。这导致离散干扰峰的衰减。除谐振频率外,PISC还具有电容特性。因此,PISC不仅可以替代常规电容器(例如Y电容器),而且还可以在离散频率下提供选择性衰减。此外,PISC具有减小SMPS的尺寸,重量和成本的潜力,因为可以减小滤波器的尺寸,同时仍可以通过使用PISC来满足电磁干扰规定。我们通过将PISC集成在反激式转换器中来证明这一概念,并研究共模干扰的衰减。此外,评估了频移对电路和PISC的影响。在我们的测量中,PISC将开关频率处的离散干扰峰抑制了45 dB,这比传统方法要好17 dB。此外,还检查了确定在SMPS中正确使用的因素,例如温度依赖性,安全等级等,并给出了适当的设计程序。最后,描述了PISC的典型应用场景。PISC将开关频率处的离散干扰峰值抑制了45 dB,这比传统方法要好17 dB。此外,还检查了确定在SMPS中正确使用的因素,例如温度依赖性,安全等级等,并给出了适当的设计程序。最后,描述了PISC的典型应用场景。PISC将开关频率处的离散干扰峰值抑制了45 dB,这比传统方法要好17 dB。此外,还检查了确定在SMPS中正确使用的因素,例如温度依赖性,安全等级等,并给出了适当的设计程序。最后,描述了PISC的典型应用场景。
更新日期:2021-02-05
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