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Design and Analysis of the DC–DC Converter With a Frequency Hopping Technique for EMI Reduction
Huynh, Hai Au,Han, Youngbong,Park, Sanghyeok,Hwang, Jisoo,Song, Eunseok,Kim, SoYoung IEEE 2018 IEEE transactions on components, packaging, and ma Vol.8 No.4
<P>As more circuit functions are integrated within a single die or small integrated package, the number of electromagnetic interference (EMI) problems caused by dc–dc converters is growing. In this paper, the dominant electromagnetic emission source on the dc–dc converter is identified by analyzing the power spectrum of the nodes. The noise scanner method is applied to a packaged single-chip prototype dc–dc converter. The results show that the dominant source of electromagnetic emission is the switching node of the converter, not the output node. The frequency hopping technique (FHT) is applied to the dc–dc converter to reduce the emission at the switching node, and its effectiveness is analyzed mathematically and experimentally. The mathematical model of FHTs is proposed to analyze its effectiveness in reducing EMI, and the optimal design using the FHT and dead-time control is fabricated with 0.18- <TEX>$\mu \text{m}$</TEX> CMOS technology. The measured power spectrum reduction by using the optimal FHT design and dead-time control at the switching node is 16 dB. The EMI reduction amount of the proposed design measured by the IC-stripline method is 12.6 dB at the fundamental switching frequency.</P>
Park, Gyeong-Jae,Son, Byungkwan,Seo, SangHyeok,Lee, Ji-Han,Kim, Yong-Jae,Jung, Sang-Yong IEEE 2018 IEEE transactions on magnetics Vol.54 No.3
<P>Numerical analysis in frequency-domain guarantees convincing accuracy by reflecting non-linearity of material without massive computation time, combining advantages of the equivalent circuit method and numerical analysis method. However, at highly magnetic saturated regions where non-linearity of the material is severe, error in torque calculation is evident, as parameters in frequency domain are presumed to be in a sinusoidal condition. Many researchers have been suggested a compensating method by creating fictious material with logically modified <TEX>$B$</TEX>– <TEX>$H$</TEX> curve. Nevertheless, the error between the results of the numerical analysis in frequency-domain and time-domain analysis is not small enough to estimate motor characteristic. Therefore, the compensation method for improving accuracy on the estimation of induction motor characteristics is proposed in this paper. The numerical analysis based on finite-element method in frequency domain has been conducted using the proposed fictious material and the result is compared to those of the conventional methods and time-domain analysis to validate its improvement on accuracy.</P>