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PWM Switching Buck Regulator Using Spread-Spectrum Modulation for EMI Reduction
|關鍵字:||EMI;電磁干擾;DC-DC converter;Spread-Spectrum Modulation;直流轉直流轉換器;展頻調變||出版社:||電機工程學系所||引用:||W. G. Wong, “A Spread-Spectrum Clock Generator Using a Phase-Compensation Fractional Phase-Locked Loop Technique,” M.S. thesis, National Chung Hsing University, 2005. C. Y. Chiang, “An OPLL-Based Spread Spectrum Clock Generator for SATA III,” M.S. thesis, Taiwan University, 2010. T. Sudo, H. Sasaki, N. Masuda, and J. L. Drewniak, “Electromagnetic interference (EMI) of system-on-package (SoP),” IEEE Trans. Adv. Packag., vol. 27, no. 2, pp. 304-314, May 2004. C. U-Yaisom, W. Khamgern, and S. Nitta, “The Study and Analysis of The Conducted EMI Suppression on Power MOSFET Using Passive Snubber circuits,” Electromagnetic Compatibility, 2002 3rd International Symposium on, Page(s): 561 - 564. D. Trevisan, P. Mattavelli, S. 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Uceda, “Exploring Interleaved Converters as an EMI Reduction Technique in Power Converters”, IECON'02. C. Chang and M. Knights, “Interleaving technique in distributed power conversion systems,” IEEE Trans. Circuits Syst. I, vol. 42, pp. 245-251, May 1995. Y. C. Lien, “A 6-bit 1-GS/s 30-mW ADC in 90-nm CMOS Technology,” M.S. thesis, Taiwan University, 2007. J. Mon, J. Gago, D. Gonzalez, J. Balcells, R. Fernandez, and I. Gil, “A new switching frequency modulation scheme for EMI reduction in multi-converter topology,” Power Electronics and Applications, 2009. EPE ''09.||摘要:||
此切換頻率調變的方式採用直接調變壓控制振盪器，可有效的降低晶片複雜度、節省面積及功率消耗。並以台積電 0.25um 1P5M CMOS製程完成切換式穩壓器結合展頻調變以及四相位切換式穩壓器結合展頻調變的設計架構、模擬及製作。工作電壓為2.5V-5V，利用數位類比轉換器將切換頻率調變在500KHz至800KHz，成功的使整個系統在不同工作電壓的電磁干擾降低18dB以上，切換式穩壓器的轉換效率最大為89.55%，整個完整系統晶片面積為1.9*1.318mm2。
PWM converters which are using constant switching frequency and variable duty cycle will increase EMI spectrum at the fundamental switching frequency and its harmonics. This thesis introduces how to avoid the effect of EMI, and confer the common techniques to eliminate EMI.
The Spread spectrum frequency modulation (SSFM) technique is used to reduce the conducted EMI in power converters, and the SSFM distributed the energy of the output signal in the controllable frequency range. And it also can reduce the harmonics peaks in the energy spectrum. The SSFM can effectively to reduce the overall system electromagnetic interference.
The switching frequency modulation is directly transferring voltage controlled oscillator, which can effectively reduce the complexity and save chip area and power consumption. The proposed switching regulator with spread spectrum modulation and the proposed four-phase switching regulator with SSFM was implemented with TSMC 0.25um 1P5M CMOS technology. The supply voltage is 2.5V-5V. A DAC is used to modulate the oscillator's frequency from 500KHz to 800KHz. The chip is successful to reduce more than 18dB EMI in different supply voltage and the max efficiency is up to 89.55%. The total chip area of system is 1.9*1.318mm2.
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