High-voltage (HV) pulsed power generators are very important in plasma generation in corona discharge reactors. With the advent of new fast switches technologies such as silicon carbide (SiC) and gallium nitride (GaN), electromagnetic interference (EMI) noise in such systems are very challenging. In this article, electromagnetic compatibility (EMC) modeling and conducted EMI analysis for a pulse generator including an ac–dc–dc power supply are developed. Moreover, the common mode (CM) EMI noise propagation through the system is discussed and the noise sources and effect of each component on the noise flowing are analyzed. The ac–dc–dc power supply role is also investigated and since there is an isolation stage in the system, the effect of high-frequency (HF) transformers that provide a flowing path for noise is also studied. In addition, the CM impedance of different parts of the system as well as the noise voltage are discussed by regarding different values for parasitic parameters of the system. As the system noise level could not meet IEC61800-3 standard, EMI attenuation techniques were applied to the system. By using balance technique and adding filtering inductor as a decoupling inductance, the EMI noise is reduced. Furthermore, an EMI filter optimized and designed for the power supply system that could reduce the EMI noise level. However, by using some EMI reduction techniques that are explained in this article, the size of the required EMI filter is reduced. In this article, EMC modeling, conducted EMI analysis, and EMI reduction techniques led to higher performance and efficiency and lower size of EMI filter that reduced the overall size of the system.

中文翻译：

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包含 AC-DC-DC 电源的脉冲发电机系统的 EMC 建模和传导 EMI 分析

高压 (HV) 脉冲发电机在电晕放电反应器的等离子体生成中非常重要。随着碳化硅 (SiC) 和氮化镓 (GaN) 等新型快速开关技术的出现，此类系统中的电磁干扰 (EMI) 噪声极具挑战性。在本文中，开发了包含交流-直流-直流电源的脉冲发生器的电磁兼容性 (EMC) 建模和传导 EMI 分析。此外，讨论了通过系统的共模 (CM) EMI 噪声传播，并分析了噪声源和每个组件对噪声流的影响。还研究了交流-直流-直流电源的作用，并且由于系统中有一个隔离级，因此还研究了为噪声提供流动路径的高频 (HF) 变压器的影响。此外，通过考虑系统寄生参数的不同值来讨论系统不同部分的共模阻抗以及噪声电压。由于系统噪声水平不能满足IEC61800-3标准，系统采用了EMI衰减技术。通过使用平衡技术并添加滤波电感作为去耦电感，降低了EMI噪声。此外，针对电源系统优化设计的EMI滤波器可以降低EMI噪声水平。但是，通过使用本文中介绍的一些 EMI 降低技术，所需的 EMI 滤波器的尺寸会减小。在本文中，EMC 建模、传导 EMI 分析和 EMI 降低技术带来了更高的性能和效率以及更小的 EMI 滤波器尺寸，从而减小了系统的整体尺寸。