Dual-Path Three-Level Buck Converter With Loop-Free Autocalibration for Flying Capacitor Self-Balancing
SCIE
SCOPUS
- Title
- 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
- Date Issued
- 2021-01
- Publisher
- Institute of Electrical and Electronics Engineers
- 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.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/120283
- DOI
- 10.1109/TPEL.2020.3003519
- ISSN
- 0885-8993
- Article Type
- Article
- Citation
- IEEE Transactions on Power Electronics, vol. 36, no. 1, page. 51 - 55, 2021-01
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