Dual-Path Three-Level Buck Converter With Loop-Free Autocalibration for Flying Capacitor Self-Balancing
- Authors
- Jung, Woojoong; Shin, Se-Un; Hong, Sung-Wan; Yoo, Sung-Min; Kong, Tae-Hwang; Yang, Jun-Hyeok; Kim, Sang-Ho; Choi, Michael; Shin, Jongshin; Lee, Hyung-Min
- Issue Date
- Jan-2021
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Keywords
- Capacitors; Buck converters; Logic gates; Inductors; Transistors; Breakdown voltage; Power transistors; Dual path; flying capacitor; loop-free calibration; self-balancing; three-level buck converter
- Citation
- IEEE TRANSACTIONS ON POWER ELECTRONICS, v.36, no.1, pp.51 - 55
- Indexed
- SCIE
SCOPUS
- Journal Title
- IEEE TRANSACTIONS ON POWER ELECTRONICS
- Volume
- 36
- Number
- 1
- Start Page
- 51
- End Page
- 55
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/50196
- DOI
- 10.1109/TPEL.2020.3003519
- ISSN
- 0885-8993
- Abstract
- This letter proposes a loop-free autocalibration technique for self-balancing of flying capacitors in a three-level dc-dc buck converter. The proposed converter utilizes a dual-path power stage with balancing switches that adaptively short flying capacitors at de-energizing phases. Thus, the dual-path three-level converter ensures that flying capacitor voltages are self-balanced at half the input voltage without using additional feedback calibration loops, leading to robust operation and competitive efficiencies. The prototype was fabricated in the 0.13-mu m CMOS BCD process and adopted two flying capacitors of 4.7 mu F each and an inductor of 10 mu H with a dc resistance of 128 m omega. When an 8-V input was converted to a 3-V output voltage with a load current of 400 mA, the measured efficiency was 88.6% at 800 kHz switching while flying capacitors are automatically balanced.
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