Dual-Path Three-Level Buck Converter with Loop-Free Autocalibration for Flying Capacitor Self-Balancing

Woojoong Jung, Se Un Shin, Sung Wan Hong, Sung Min Yoo, Tae Hwang Kong, Jun Hyeok Yang, Sang Ho Kim, Michael Choi, Jongshin Shin, Hyung Min Lee

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


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-μm CMOS BCD process and adopted two flying capacitors of 4.7 μF each and an inductor of 10 μH with a dc resistance of 128 mΩ. 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.

Original languageEnglish
Article number9120215
Pages (from-to)51-55
Number of pages5
JournalIEEE Transactions on Power Electronics
Issue number1
Publication statusPublished - 2021 Jan


  • Dual path
  • flying capacitor
  • loop-free calibration
  • self-balancing
  • three-level buck converter

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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