Abstract：Pulsed power load supply systems operating under dynamic conditions generate more complicated conducted electromagnetic interference (EMI) than conventional steady-state converters because of the interaction between low-frequency pulse dynamics and high-frequency switching harmonics. Existing conducted EMI studies mainly focus on steady-state operating conditions, whereas the EMI formation mechanism and electromagnetic safety characteristics under pulse operating conditions remain insufficiently understood. This paper investigates the conducted EMI mechanism and electromagnetic safety assessment of pulse load power supply systems. A phase-shifted full-bridge converter was selected as the research object. First, a differential-mode conducted EMI analytical model was established by regarding the converter input current as the differential-mode noise source and incorporating the line impedance stabilization network (LISN) into the equivalent circuit. Subsequently, a multi-time-scale analytical framework was developed to describe the interaction between low-frequency pulse dynamics and high-frequency switching harmonics. The pulse load current was decomposed into DC and AC components, and an input current spectrum model was derived by linearizing the harmonic components around the operating point. The analytical results revealed that the low-frequency pulse current dynamically modulates the converter switching harmonics, producing modulation sidebands distributed at kfs±nfp, where fs and fp denote the switching frequency and pulse frequency, respectively. Based on the proposed model, the influences of pulse peak power, pulse frequency, and pulse duty cycle on the conducted EMI spectrum were analyzed. Finally, an experimental platform was established to validate the theoretical model under different pulse operating conditions. Experimental results showed that the proposed model accurately explained the evolution of the conducted EMI spectrum under pulse operating conditions. As the pulse peak power increased, the harmonic amplitude of the converter input current increased correspondingly, resulting in a higher differential-mode conducted EMI level. Compared with steady-state operation, pulse operating conditions introduced additional low-frequency modulation components, leading to a more complicated conducted EMI spectrum. Increasing the pulse frequency generated denser modulation sidebands and caused the low-frequency EMI spectrum to evolve from discrete spectral components to a continuous spectral envelope. Variations in pulse duty cycle mainly redistributed the spectral envelope by changing the harmonic energy distribution of the pulse current. The predicted modulation sidebands agreed well with the experimental results. Moreover, the coupling among the input filter, parasitic parameters, and pulse current harmonics enhanced the input current oscillation under high-frequency pulse operating conditions. Compared with steady-state operation, the conducted EMI amplitude around 10 kHz and 50 kHz increased by approximately 25.82 dBμV and 23.23 dBμV, respectively. The results indicate that pulse load dynamics increase not only the complexity of the conducted EMI spectrum but also the electromagnetic safety risks of the power supply system. The coupling between low-frequency pulse harmonics and high-frequency switching harmonics aggravates local resonance, impedance mismatch, and dynamic instability, particularly under high-power and high-frequency pulse operating conditions. Therefore, pulse dynamic characteristics, converter switching harmonics, system impedance matching, and filter design should be jointly considered in conducted EMI analysis and electromagnetic safety assessment. The following conclusions can be drawn from the simulation analysis: (1) A multi-time-scale analytical model is established to describe the coupling mechanism between pulse load dynamics and converter switching harmonics. The analytical model reveals that the pulse current dynamically modulates the high-frequency switching harmonics, producing modulation sidebands distributed around the switching frequency and its multiples according to kfs±nfp. (2) Pulse peak power, pulse frequency, and pulse duty cycle affect different characteristics of the conducted EMI spectrum. Pulse peak power mainly determines the amplitude of differential-mode conducted interference, pulse frequency governs the sideband spacing and spectral spreading, whereas pulse duty cycle controls the spectral envelope and harmonic energy distribution. (3) Pulse load dynamics increase the input current oscillation and further aggravate the conducted electromagnetic environment by enhancing the risks of local resonance and dynamic instability. Consequently, electromagnetic safety assessment and EMI suppression for pulse load power supply systems should simultaneously consider pulse dynamic characteristics, converter switching behavior, and system impedance matching.
杨平, 王彪, 彭宇圣, 范信添, 王威. 面向脉冲负载供电系统的传导电磁干扰机理与电磁安全评估[J]. 电工技术学报, 2026, 41(13): 4403-4416.
Yang Ping, Wang Biao, Peng Yusheng, Fan Xintian, Wang Wei. Conducted Electromagnetic Interference Mechanism and Electromagnetic Safety Assessment for Pulsed Power Load Power Supply Systems. Transactions of China Electrotechnical Society, 2026, 41(13): 4403-4416.
[1] Ao Wenjie, Chen Jiawei, Lü Wenjie.Coordinate sizing and control of the onboard pulse power supply system[J]. IEEE Transactions on Industrial Electronics, 2024, 71(8): 9034-9043. [2] Zhang Boyi, Wang Shuo.A survey of EMI research in power electronics systems with wide-bandgap semiconductor devices[J]. IEEE Journal of Emerging and Selected Topics in Power Electronics, 2020, 8(1): 626-643. [3] Li Hong, Liu Xueyang, Li Yanjun, et al.A two-stage systematic simulation modeling approach for conducted emissions in DC-DC boost converters[J]. IEEE Transactions on Transportation Electrification, 2025, 11(6): 14166-14176. [4] 何杰, 刘钰山, 毕大强, 等. 开关变换器传导干扰抑制策略综述[J]. 电工技术学报, 2022, 37(6): 1455-1472. He Jie, Liu Yushan, Bi Daqiang, et al.Review of conducted electromagnetic interference suppression strategies for switching converters[J]. Transactions of China Electrotechnical Society, 2022, 37(6): 1455-1472. [5] Xie Lihong, Li Sifan, Li Ying, et al. Modeling and prediction of conducted electromagnetic interference in phase-shifted full-bridge converters[J]. IEEE Journal of Emerging and Selected Topics in Power Electronics, 2026, PP(99): 1. [6] 成林, 欧宏, 毕闯,等. 基于SiC MOSFET的同步Buck变换器电磁干扰噪声分析及预测[J]. 电工技术学报, 2021, 36(增刊2): 627-634, 643. Cheng Lin, Ou Hong, Bi Chuang, et al.Analysis and prediction of electromagnetic interference noise in synchronous Buck converter with SiC MOSFET[J]. Transactions of China Electrotechnical Society, 2021, 36(S2): 627-634, 643. [7] Liu Chen, Blaabjerg F, Davari P.DM EMI noise prediction for BCM based single-phase grid-connected inverter[C]//2024 14th International Workshop on the Electromagnetic Compatibility of Integrated Circuits (EMC Compo), Torino, Italy, 2024: 1-5. [8] 兰宇杰, 曾晓辉, 陈为, 等. 电磁干扰滤波器中共模扼流圈的高频模型[J]. 电工技术学报, 2025, 40(6): 1805-1815. Lan Yujie, Zeng Xiaohui, Chen Wei, et al.High-frequency model of common-mode choke in electromagnetic interference filters[J]. Transactions of China Electrotechnical Society, 2025, 40(6): 1805-1815. [9] 彭金融, 毛行奎, 崔文玲, 等. 基于插入无源二端口网络的噪声源阻抗提取方法研究[J]. 电工技术学报, 2023, 38(2): 523-532. Peng Jinrong, Mao Xingkui, Cui Wenling, et al.Research on noise soure impedance extraction method based on inserting passive two-port network[J]. Transactions of China Electrotechnical Society, 2023, 38(2): 523-532. [10] 章子量, 张榕烜, 陈启, 等. 考虑插入损耗法敏感度的噪声源阻抗提取优化方法[J]. 电机与控制学报, 2025, 29(7): 63-74. Zhang Ziliang, Zhang Rongxuan, Chen Qi, et al.Optimization method for noise source impedance extraction considering sensitivity of insertion loss method[J]. Electric Machines and Control, 2025, 29(7): 63-74. [11] 姬军鹏, 王瑞娜, 杨惠, 等. 消除EMI噪声影响的电机驱动系统噪声源阻抗提取方法[J]. 电工技术学报, 2025, 40(19): 6213-6222. Ji Junpeng, Wang Ruina, Yang Hui, et al.Extraction method of noise source impedance of motor drive system with eliminating EMI noise influence[J]. Transactions of China Electrotechnical Society, 2025, 40(19): 6213-6222. [12] Rhee J, Kim H, Chu K, et al.Noise source impedance extraction method of switched-mode power supply (SMPS) in PC according to the frequency range[C]//2023 IEEE Symposium on Electromagnetic Compatibility & Signal/Power Integrity (EMC+SIPI), Grand Rapids, MI, USA, 2023: 443-447. [13] Wang Zijian, Wang Shuo, Kong Pengju, et al.DM EMI noise prediction for constant on-time, critical mode power factor correction converters[J]. IEEE Transactions on Power Electronics, 2011, 27(7): 3150-3157. [14] 徐浩东, 罗嗣勇, 毕闯,等. 基于SiC MOSFET同步Buck DC-DC变换器的宽频混合EMI滤波器设计[J]. 电工技术学报, 2024, 39(10): 3060-3069. Xu Haodong, Luo Siyong, Bi Chuang, et al.Design of broadband hybrid EMI filter in synchronous buck DC-DC converter with SiC MOSFETs[J]. Transactions of China Electrotechnical Society, 2024, 39(10): 3060-3069. [15] Li Hong, Wang Siyi, He Daozhen, et al.A hybrid EMI filter incorporating active Y-capacitor for common-mode noise mitigation[J]. IEEE Transactions on Power Electronics, 2025, 40(4): 5252-5264. [16] 秦海鸿, 童辰龙, 吴凡, 等. 基于扩频调制策略与无源滤波器相结合的SiC电驱系统电磁干扰噪声协同抑制方法[J/OL]. 电工技术学报, 2025: 1-13[2026-07-02]. https://doi.org/10.19595/j.cnki.1000-6753.tces.251236. Qin Haihong, Tong Chenlong, Wu Fan, et al. A collaborative electromagnetic interference noise suppression method for SiC electric drive systems based on the combination of spread spectrum modulation strategy and passive filters[J/OL]. Transactions of China Electrotechnical Society, 2025: 1-13[2026-07-02]. https://doi.org/10.19595/j.cnki.1000-6753.tces.251236. [17] Zhang Yechi, Li Qiao, Jiang Dong.A motor CM impedance based transformerless active EMI filter for DC-side common-mode EMI suppression in motor drive system[J]. IEEE Transactions on Power Electronics, 2020, 35(10): 10238-10248. [18] 郭靖, 王辉, 黄元芯, 等. 高电压比平面磁集成变压器的共模电磁干扰噪声抑制和优化设计[J/OL].电工技术学报, 2026: 1-14[2026-07-02]. https://doi.org/10.19595/j.cnki.1000-6753.tces.251564. Guo Jing, Wang Hui, Huang Yuanxin, et al. Optimal design and Common-Mode electromagnetic interference noise suppression for high Turn-Ratio planar magnetic integration transformer[J/OL]. Transactions of China Electrotechnical Society.2026: 1-14[2026-07-02]. https://doi.org/10.19595/j.cnki.1000-6753.tces.251564. [19] 杨平, 彭宇圣, 陈曦, 等. 航空航天脉冲负载功率变换技术研究综述[J]. 西南交通大学学报, 2026, 61(3): 895-913. Yang Ping, Peng Yusheng, Chen Xi, et al.Review of power conversion technologies for aerospace pulsed power loads[J]. Journal of Southwest Jiaotong University, 2026, 61(3): 895-913. [20] Yang Ping, Chen Xi, Chen Rongqian, et al.Stability improvement of pulse power supply with dual-inductance active storage unit using hysteresis current control[J]. IEEE Journal on Emerging and Selected Topics in Circuits and Systems, 2021, 11(1): 111-120. [21] Zhang Li, Ruan Xinbo, Ren Xiaoyong.One-cycle control for electrolytic capacitor-less second harmonic current compensator[J]. IEEE Transactions on Power Electronics, 2018, 33(2): 1724-1739. [22] Ren Xiaoyong, Bai Lei, Chen Yu, et al.Single-phase AC-DC converter with SiC power pulsation buffer for pulse load applications[J]. IEEE Journal of Emerging and Selected Topics in Power Electronics, 2020, 8(1): 517-528. [23] Chen Xi, Yang Ping, Peng Yusheng, et al.Output voltage drop and input current ripple suppression for the pulse load power supply using virtual multiple quasi-Notch-filters impedance[J]. IEEE Transactions on Power Electronics, 2023, 38(8): 9552-9565. [24] Chen Xi, Yang Ping, Peng Yusheng, et al.Impedance-shaping control scheme for suppressing input current ripple and improving dynamic response in the cascaded pulsed load power supply[J]. IEEE Journal of Emerging and Selected Topics in Power Electronics, 2026, 14(1): 822-839. [25] Davari P, Blaabjerg F, Hoene E, et al.Improving 9-150 kHz EMI performance of single-phase PFC rectifier[C]//CIPS 2018; 10th International Conference on Integrated Power Electronics Systems, Stuttgart, Germany, 2018: 1-6. [26] Ramya K, Gopalakrishnan J, Chokkalingam B, et al.A comprehensive evaluation and assessment practices of electromagnetic interferences in electric vehicle[J]. IEEE Access, 2025, 13: 40520-40560. [27] Han J, Nah W.Prediction of conducted emission in a switching circuit with cascaded black-box networks using harmonic impedance[J]. IEEE Access, 2026, 14: 67327-67340. [28] Khelladi S, Rizoug N, Morel C, et al.Broadband simulation-based EMC modeling and EMI assessment of a GaN-based phase-shift full-bridge converter for EV DC powertrains[J]. Actuators, 2026, 15(6): 340. [29] Specification for Radio Disturbance and Immunity Measuring Apparatus andMethods—Part 2-1: Conducted Disturbance Measurements CISPR 16-2-1:2014/COR1:2020[S]. 2020. [30] 国家质量监督检验检疫总局, 环境保护部. 电磁环境控制限值: GB 8702—2014[S]. 北京: 中国环境科学出版社, 2015. [31] 中华人民共和国生态环境部. 区域电磁环境调查与评估方法(试行): HJ 1349—2024[S]. 北京: 中国环境科学出版社, 2024. [32] Assessment of Electromagnetic Field Exposure from Wireless Power Transfer SystemsIEC/IEEE 63184: 2025[S]. 2025. [33] Wang Zijian, Wang Shuo, Kong Pengju, et al.DM EMI noise prediction for constant on-time, critical mode power factor correction converters[J]. IEEE Transactions on Power Electronics, 2012, 27(7): 3150-3157.
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