Abstract Non-isolated switching power supplies with coupled-inductor have more parasitic elements like the leakage inductance in comparison with the regular non-isolated converters. Due to the undesirable resonances between the leakage inductance and other parasitic capacitors, the conducted electromagnetic emissions increase. In order to improve electromagnetic compatibility, adopting passive or active parasitic cancellation methods can be used. In this paper, a passive cancellation circuit is combined with the converter`s coupled-inductor cell. Among the non-isolated converters, the boost converter where a lossless snubber with a coupled inductor is applied in its soft switching cell is selected to reveal the advantage of this proposed method with respect to EMC. To verify the advantage, the conducted EMI of this proposed converter is compared with the regular boost converter and boost converter with a lossless snubber. The experimental results indicate a considerable reduction in the conducted EMI levels. This proposed technique can be applied in other non-isolated topologies like buck, buck-boost, SEPIC, Ćuk and converters with tapped inductor.

中文翻译：

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使用无源 EMI 消除方法改进带有耦合电感器的软开关升压转换器

摘要 带有耦合电感的非隔离开关电源与普通的非隔离转换器相比，具有更多的寄生元件，如漏电感。由于漏电感和其他寄生电容器之间不希望有的谐振，传导的电磁辐射增加。为了提高电磁兼容性，可以采用无源或有源的寄生消除方法。在本文中，无源抵消电路与转换器的耦合电感单元相结合。在非隔离转换器中，选择升压转换器，其中在其软开关单元中应用了带有耦合电感器的无损缓冲器，以揭示该方法在 EMC 方面的优势。为了验证优势，该转换器的传导 EMI 与常规升压转换器和带无损缓冲器的升压转换器进行了比较。实验结果表明传导 EMI 水平显着降低。这种提议的技术可以应用于其他非隔离拓扑，如降压、降压-升压、SEPIC、Ćuk 和带有抽头电感的转换器。