https://scholars.lib.ntu.edu.tw/handle/123456789/607041
標題: | A Random Modulation Spread-Spectrum Digital PWM for a Low System Clock Digital Buck Converter | 作者: | Moon C.-H Chen C.-J Lee S.-W. CHING-JAN CHEN |
關鍵字: | Digitally controlled buck converter;dithering;pulse-width modulation;spread spectrum;DC-DC converters;Electric power system control;Power control;Spectroscopy;Voltage control;Buck converters;Digitally controled buck converter;Digitally controlled;Dithering;Higher efficiency;Power;Pulsewidth modulations (PWM);Random modulation;Spread spectra;System clock;Pulse width modulation | 公開日期: | 2021 | 卷: | 9 | 起(迄)頁: | 156663-156671 | 來源出版物: | IEEE Access | 摘要: | The need for a high-efficiency power system has emerged since many IoT devices are mainly operated by batteries. A power system with analog control can have a high control bandwidth, but it is relatively vulnerable to noise disturbances and may suffer from control problems. On the other hand, a digitally controlled power system has high reliability and great controllability at the expense of switching noise and EMI issues. To implement a digitally controlled PWM with high resolution and low EMI, this study proposes a random carrier frequency modulation with dithered duty cycle method, where wide spectrum dithering and random modulation of spread spectrum PWM are tightly integrated. The proposed system was not only able to suppress voltage ripples, but also possible to minimize the occurrence of dependent frequencies due to the fixed dithering pattern. The spectrum of the output voltage showed that the switching frequency component was reduced by about 6.1dB and the output voltage ripples was also reduced compared to the existing PWM techniques. ? 2013 IEEE. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85120784489&doi=10.1109%2fACCESS.2021.3126556&partnerID=40&md5=05e35f39c554b8c761fba1e56ff92fa8 https://scholars.lib.ntu.edu.tw/handle/123456789/607041 |
ISSN: | 21693536 | DOI: | 10.1109/ACCESS.2021.3126556 |
顯示於: | 電機工程學系 |
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