A Random Modulation Spread-Spectrum Digital PWM for a Low System Clock Digital Buck Converter
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 digi...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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IEEE
2021-01-01
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| Series: | IEEE Access |
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| Online Access: | https://ieeexplore.ieee.org/document/9606909/ |
| _version_ | 1818751687555284992 |
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| author | Chan-Ho Moon Ching-Jan Chen Seong-Won Lee |
| author_facet | Chan-Ho Moon Ching-Jan Chen Seong-Won Lee |
| author_sort | Chan-Ho Moon |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-12-18T04:39:32Z |
| format | Article |
| id | doaj.art-3dfd4e1943454f1dbce56f2172f215b2 |
| institution | Directory Open Access Journal |
| issn | 2169-3536 |
| language | English |
| last_indexed | 2024-12-18T04:39:32Z |
| publishDate | 2021-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Access |
| spelling | doaj.art-3dfd4e1943454f1dbce56f2172f215b22022-12-21T21:20:46ZengIEEEIEEE Access2169-35362021-01-01915666315667110.1109/ACCESS.2021.31265569606909A Random Modulation Spread-Spectrum Digital PWM for a Low System Clock Digital Buck ConverterChan-Ho Moon0https://orcid.org/0000-0002-9405-5867Ching-Jan Chen1https://orcid.org/0000-0003-4696-0464Seong-Won Lee2https://orcid.org/0000-0002-2782-4697Hanwha VisionNext, Seongnam, South KoreaDepartment of Electrical Engineering, National Taiwan University, Taipei, TaiwanDepartment of Computer Engineering, Kwangwoon University, Seoul, South KoreaThe 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.https://ieeexplore.ieee.org/document/9606909/Digitally controlled buck converterspread spectrumditheringpulse-width modulation |
| spellingShingle | Chan-Ho Moon Ching-Jan Chen Seong-Won Lee A Random Modulation Spread-Spectrum Digital PWM for a Low System Clock Digital Buck Converter IEEE Access Digitally controlled buck converter spread spectrum dithering pulse-width modulation |
| title | A Random Modulation Spread-Spectrum Digital PWM for a Low System Clock Digital Buck Converter |
| title_full | A Random Modulation Spread-Spectrum Digital PWM for a Low System Clock Digital Buck Converter |
| title_fullStr | A Random Modulation Spread-Spectrum Digital PWM for a Low System Clock Digital Buck Converter |
| title_full_unstemmed | A Random Modulation Spread-Spectrum Digital PWM for a Low System Clock Digital Buck Converter |
| title_short | A Random Modulation Spread-Spectrum Digital PWM for a Low System Clock Digital Buck Converter |
| title_sort | random modulation spread spectrum digital pwm for a low system clock digital buck converter |
| topic | Digitally controlled buck converter spread spectrum dithering pulse-width modulation |
| url | https://ieeexplore.ieee.org/document/9606909/ |
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