A high efficiency and fast transient digital low-dropout assisted switched-capacitor converter for EMI-free Internet of Everything (IoE) systems

Shao Qi Chen, Yen Ting Lin, Yu Sheng Ma, Wen Hau Yang, Ke-Horng Chen, Ying Hsi Lin, Jian Ru Lin, Tsung Yen Tsai

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

State-of-the-art closed-loop switched-capacitor (SC) designs usually regulate the output voltage by pulse frequency modulation (PFM) with the disadvantage of large electromagnetic interference (EMI). It may cause the failure of the Internet of Everything (IoE) devices. This paper proposes the hybrid digital low drop-out (DLDO) SC converter with a constant switching pulse width modulation (PWM) control for low EMI. Besides, the analog-to-digital current conversion provided by the DLDO due to its fast transient response can predict the desired ratio for the SC and reduce the dip voltage at the same time. The handshaking technique achieves smooth transition in the hybrid architecture. Experimental results show peak efficiency of 85% (closed-loop) and 95% (open loop) since the power converter has fast transient response by the DLDO prediction and reduction of switching power loss. Accurate fine tune operation by the DLDO and smooth handshaking improve load regulation from 49mV to 3mV and undershoot from 263mV to 93mV with a reduced recovery time of 200ns.

Original languageEnglish
Title of host publication2017 IEEE Asian Solid-State Circuits Conference, A-SSCC 2017 - Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages129-132
Number of pages4
ISBN (Electronic)9781538631782
DOIs
StatePublished - 26 Dec 2017
Event2017 IEEE Asian Solid-State Circuits Conference, A-SSCC 2017 - Seoul, Korea, Republic of
Duration: 6 Nov 20178 Nov 2017

Publication series

Name2017 IEEE Asian Solid-State Circuits Conference, A-SSCC 2017 - Proceedings
Volume2017-January

Conference

Conference2017 IEEE Asian Solid-State Circuits Conference, A-SSCC 2017
CountryKorea, Republic of
CitySeoul
Period6/11/178/11/17

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