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首页> 外文期刊>IEEE Transactions on Power Electronics >Reduced Conductive EMI in Switched-Mode DC–DC Power Converters Without EMI Filters: PWM Versus Randomized PWM
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Reduced Conductive EMI in Switched-Mode DC–DC Power Converters Without EMI Filters: PWM Versus Randomized PWM

机译：不带EMI滤波器的开关模式DC-DC电源转换器中的导电EMI降低：PWM与随机PWM

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摘要

This paper addresses improved electromagnetic compatibility (EMC) in switched-mode power converters (SMPCs), without using electromagnetic interference (EMI) filters. A practical solution is proposed for minimizing conductive EMI in a pulsewidth modulated (PWM), and random PWM dc-dc power converters. A comparative investigation is performed into the use of different random modulation schemes (driven by the DSP-2 board with the TMS320C32) as against the normal PWM. The effectiveness of randomization on spreading those dominating frequencies that normally exist in constant frequency PWM schemes is evaluated by power spectral density (PSD) estimations in the low-frequency range. Some parasitical- and topology-based EMI sources in devices are presented and frequency analysis is shown by using the discrete Fourier transform (DFT). SPICE simulations are also used to verify practical solutions for eliminating negative EMI sources and achieving EMC improvements. Finally, levels of conductive EMI are estimated with DFT, and experimentally verified to comply with the CISPR 25 (or EN 55025) regulations. Moreover, it is clearly shown, that limited speed PWM driving of the power switches with appropriate snubber circuits guarantees reduced conductive EMI. When considering the price and high EMC, in the final solution the power converter is driven by the mu-controller PIC16F876 with limited numerical and peripheral capabilities, where only normal PWM and randomized PWM can be implemented
机译：本文解决了开关模式电源转换器（SMPC）中改进的电磁兼容性（EMC），而无需使用电磁干扰（EMI）滤波器的情况。为减小脉宽调制（PWM）和随机PWM DC-DC电源转换器中的传导EMI，提出了一种实用的解决方案。针对不同的随机调制方案（由带有TMS320C32的DSP-2板驱动）与正常的PWM进行了比较研究。通过扩展低频范围内的功率谱密度（PSD）评估，可以随机化扩展那些通常存在于恒定频率PWM方案中的主频的有效性。介绍了设备中一些基于寄生和拓扑的EMI源，并通过使用离散傅里叶变换（DFT）显示了频率分析。 SPICE仿真还用于验证实用的解决方案，以消除负EMI源并实现EMC改进。最后，使用DFT估算导电EMI的水平，并通过实验验证其符合CISPR 25（或EN 55025）规定。此外，可以清楚地看到，具有适当缓冲电路的功率开关的有限速PWM驱动可确保降低导电EMI。考虑到价格和较高的EMC，在最终解决方案中，电源转换器由具有有限的数值和外围功能的μ控制器PIC16F876驱动，其中只能实现普通PWM和随机PWM

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