A High-Voltage Dual-Input Buck Converter with Bidirectional Inductor Current for Triboelectric Energy-Harvesting Applications

Junyoung Maeng, Inho Park, Minseob Shim, Junwon Jeong, Chulwoo Kim

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


This article presents a high-voltage (HV) dual-input buck converter with a bidirectional inductor current (I L) and a fully integrated maximum power point tracking circuit for triboelectric (TE) energy-harvesting applications. The proposed converter regulates HV inputs through a single shared inductor, and HV inputs can be isolated without using an additional HV protection circuit. In addition, the proposed diode-based HV sampling circuit can accomplish high ac voltage sampling and peak detection to perform the fractional open-circuit voltage method without any external components. Fabricated using a 180-nm bipolar-CMOS-DMOS (BCD) process, the proposed system with a self-manufactured polytetrafluroethylene (PTFE)-based TE nanogenerator can regulate two HV inputs up to 70 V and achieve a power conversion efficiency of 84.7% and an end-to-end efficiency of 75.6%, which are 30.2% and 22.7% better than prior work, respectively.

Original languageEnglish
Article number9165845
Pages (from-to)541-553
Number of pages13
JournalIEEE Journal of Solid-State Circuits
Issue number2
Publication statusPublished - 2021 Feb

Bibliographical note

Funding Information:
Manuscript received January 13, 2020; revised June 12, 2020; accepted July 26, 2020. Date of publication August 12, 2020; date of current version January 28, 2021. This article was approved by Guest Editor Wing-Hung Ki. This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) 2019R1A2B5B03100756. The chip fabrication and EDA tool were supported by the IC Design Education Center (IDEC), Korea. (Corresponding author: Chulwoo Kim.) Junyoung Maeng, Inho Park, and Chulwoo Kim are with the Department of Electrical Engineering, Korea University, Seoul 02841, South Korea (e-mail: ckim@korea.ac.kr).

Publisher Copyright:
© 1966-2012 IEEE.


  • Buck converter
  • dc-dc converter
  • dual input (DI)
  • energy harvesting (EH)
  • high-voltage (HV) sampling
  • inductor sharing
  • three-level gate driver (TLGD)
  • triboelectric nanogenerator (TENG)

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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