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A Cross-Coupled Hybrid Switched-Capacitor Buck Converter With Extended Conversion Range and Enhanced DCR Loss Reduction
Qiaobo Ma1,2; Huihua Li1,2; Xiongjie Zhan1,2; Anyang Zhao1,2; Yang Jiang1,2; Man-Kay Law1,2; Rui P. Martins1,2,3; Pui-In Mak1,2
2024-10
Source PublicationIEEE Journal of Solid-State Circuits
ISSN0018-9200
Volume59Issue:10Pages:3192-3203
Abstract

This article presents a hybrid switched-capacitor (SC) buck converter designed to optimize the reduction in inductor average current ( IL,DC) across a wide voltage conversion ratio (VCR) range for Li-ion battery-powered systems. The proposed topology is bases on a modified dual-path (DP) hybrid power stage structure and elevates the inductor de-energizing voltage to enhance IL,DC reduction. With a dual-branch interleaved cross-coupled structure, it reduces the required number of SC cells, thereby lowering costs. Moreover, the converter attains a seamless switching-phase transition around VCR of 0.5, ensuring smooth operations and simplifying control complexity. A stable efficiency is maintained across the entire VCR range by balancing inductor DC resistance (DCR) loss and switch/path conduction loss. In the circuit design aspect, a two-quadrant level shifter (2QLS) is proposed to meet power switch driving requirements in a positive-negative wide-range floating domain. Fabricated in a 180-nm BCD process with a 4.42 mm2 chip area, the converter prototype attains a peak conversion efficiency of 91% when converting a 2.7 ∼ 4.2 V input to a 1 ∼ 1.8 V output. It delivers a maximum load current of 4.2 A using two 4.7-μH inductors with 175 m Ω DCR in 16.7 mm3 each and achieves an average efficiency of 90% with only 1.5% variation.

KeywordCross-coupled Dc Resistance (Dcr) Hybrid Switched-capacitor (Sc) Inductor Current Reduction Level Shifter
DOI10.1109/JSSC.2024.3416408
URLView the original
Indexed BySCIE
Language英語English
WOS Research AreaEngineering
WOS SubjectEngineering, Electrical & Electronic
WOS IDWOS:001263381300001
PublisherIEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 445 HOES LANE, PISCATAWAY, NJ 08855-4141
Scopus ID2-s2.0-85204699607
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Citation statistics
Document TypeJournal article
CollectionFaculty of Science and Technology
THE STATE KEY LABORATORY OF ANALOG AND MIXED-SIGNAL VLSI (UNIVERSITY OF MACAU)
INSTITUTE OF MICROELECTRONICS
DEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING
Corresponding AuthorYang Jiang
Affiliation1.State Key Laboratory of Analog and Mixed-Signal VLSI, Institute of Microelectronics, University of Macau, Macao
2.ECE Department, Faculty of Science and Technology, University of Macau, Macao
3.On leave from Instituto Superior Tecnico, Universidade de Lisboa, Lisboa, Portugal
First Author AffilicationUniversity of Macau;  Faculty of Science and Technology
Corresponding Author AffilicationUniversity of Macau;  Faculty of Science and Technology
Recommended Citation
GB/T 7714
Qiaobo Ma,Huihua Li,Xiongjie Zhan,et al. A Cross-Coupled Hybrid Switched-Capacitor Buck Converter With Extended Conversion Range and Enhanced DCR Loss Reduction[J]. IEEE Journal of Solid-State Circuits, 2024, 59(10), 3192-3203.
APA Qiaobo Ma., Huihua Li., Xiongjie Zhan., Anyang Zhao., Yang Jiang., Man-Kay Law., Rui P. Martins., & Pui-In Mak (2024). A Cross-Coupled Hybrid Switched-Capacitor Buck Converter With Extended Conversion Range and Enhanced DCR Loss Reduction. IEEE Journal of Solid-State Circuits, 59(10), 3192-3203.
MLA Qiaobo Ma,et al."A Cross-Coupled Hybrid Switched-Capacitor Buck Converter With Extended Conversion Range and Enhanced DCR Loss Reduction".IEEE Journal of Solid-State Circuits 59.10(2024):3192-3203.
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