迟滞DC-DC变换器的扫频调制噪声扩频降噪技术

N. Miki, N. Tsukiji, Koyo Asaishi, Y. Kobori, N. Takai, H. Kobayashi
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引用次数: 10

摘要

随着工业技术的发展,开关电源的小型化和高效化已经成为电源电路的主流。另一方面,对开关产生的电磁干扰(EMI)的对抗是研究的主题。众所周知,减少电磁干扰会使输出纹波和负载响应恶化,但两者之间的关系尚未得到研究。此外,作为一种降低EMI的方法,M系列电路也曾被使用过,但这种方法的缺点是频谱级的衰减量和扩散宽度难以定量理解。本文提出了时钟扫频法作为抑制电磁干扰的方法,并通过仿真和实现阐明了恒时纹波控制DC-DC变换器中电磁干扰抑制量与各种特性之间的关系。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
EMI reduction technique with noise spread spectrum using swept frequency modulation for hysteretic DC-DC converters
Due to the development of industrial technology, miniaturization and high efficiency of the switching power supply which is the mainstream in the power supply circuit are realized. On the other hand, countermeasures against electromagnetic interference (EMI) generated by switching are the subjects. It is known that output ripple and load response deteriorate by reducing EMI, but the relationship has not been studied. Also, as a method of EMI reduction, M series circuits have been used in the past, but this method had the disadvantage that the attenuation amount at the spectrum level and the diffusion width are hard to understand quantitatively. In this paper, we propose clock frequency sweep method as EMI reduction method and clarify the correlation between EMI reduction amount and various characteristics in constant on time (COT) ripple control DC-DC converter by simulation and implementation.
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