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...

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Autores principales:	Chan-Ho Moon, Ching-Jan Chen, Seong-Won Lee
Formato:	article
Lenguaje:	EN
Publicado:	IEEE 2021
Materias:	Digitally controlled buck converter spread spectrum dithering pulse-width modulation Electrical engineering. Electronics. Nuclear engineering TK1-9971
Acceso en línea:	https://doaj.org/article/3dfd4e1943454f1dbce56f2172f215b2
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id	oai:doaj.org-article:3dfd4e1943454f1dbce56f2172f215b2
record_format	dspace
spelling	oai:doaj.org-article:3dfd4e1943454f1dbce56f2172f215b22021-12-02T00:00:12ZA Random Modulation Spread-Spectrum Digital PWM for a Low System Clock Digital Buck Converter2169-353610.1109/ACCESS.2021.3126556https://doaj.org/article/3dfd4e1943454f1dbce56f2172f215b22021-01-01T00:00:00Zhttps://ieeexplore.ieee.org/document/9606909/https://doaj.org/toc/2169-3536The 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.Chan-Ho MoonChing-Jan ChenSeong-Won LeeIEEEarticleDigitally controlled buck converterspread spectrumditheringpulse-width modulationElectrical engineering. Electronics. Nuclear engineeringTK1-9971ENIEEE Access, Vol 9, Pp 156663-156671 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Digitally controlled buck converter spread spectrum dithering pulse-width modulation Electrical engineering. Electronics. Nuclear engineering TK1-9971
spellingShingle	Digitally controlled buck converter spread spectrum dithering pulse-width modulation Electrical engineering. Electronics. Nuclear engineering TK1-9971 Chan-Ho Moon Ching-Jan Chen Seong-Won Lee A Random Modulation Spread-Spectrum Digital PWM for a Low System Clock Digital Buck Converter
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.
format	article
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
title	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_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_sort	random modulation spread-spectrum digital pwm for a low system clock digital buck converter
publisher	IEEE
publishDate	2021
url	https://doaj.org/article/3dfd4e1943454f1dbce56f2172f215b2
work_keys_str_mv	AT chanhomoon arandommodulationspreadspectrumdigitalpwmforalowsystemclockdigitalbuckconverter AT chingjanchen arandommodulationspreadspectrumdigitalpwmforalowsystemclockdigitalbuckconverter AT seongwonlee arandommodulationspreadspectrumdigitalpwmforalowsystemclockdigitalbuckconverter AT chanhomoon randommodulationspreadspectrumdigitalpwmforalowsystemclockdigitalbuckconverter AT chingjanchen randommodulationspreadspectrumdigitalpwmforalowsystemclockdigitalbuckconverter AT seongwonlee randommodulationspreadspectrumdigitalpwmforalowsystemclockdigitalbuckconverter
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A Random Modulation Spread-Spectrum Digital PWM for a Low System Clock Digital Buck Converter

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