A Four-Phase Hybrid Step-Up/Down Converter with RMS Inductor Current Reduction and Delay-Based Zero-Current Detection

Inho Park, Junyoung Maeng, Jinwoo Jeon, Hyunjin Kim, Chulwoo Kim

Research output: Contribution to journalArticlepeer-review

Abstract

In this letter, a four-phase hybrid step-up/step-down dc-dc converter with a delay-based zero-current detector (ZCD) is proposed. The proposed power stage operates in step-up or step-down mode depending on the target output voltage. It utilizes hybrid switched-inductor-capacitor and dual-path topologies with multiphase operation to reduce conduction loss due to the dc resistance of the inductor by reducing the rms inductor current (IL). The delay-based ZCD determines the zero-current point of IL with a five-bit binary signal to compensate for the propagation delay between the control and the output signals of the driver. The system is fabricated using 180-nm CMOS technology. The power density is 1.838 A/mm2, and the peak efficiency is measured at 89.49% and 86.83% in the step-down and step-up mode, respectively, with a load current range of up to 2 A.

Original languageEnglish
Pages (from-to)3708-3712
Number of pages5
JournalIEEE Transactions on Power Electronics
Volume37
Issue number4
DOIs
Publication statusPublished - 2022 Apr 1

Keywords

  • Continuous output delivery current
  • hybrid buck-boost converter
  • multiphase dc-dc converter
  • rms inductor current reduction
  • zero-current detector (ZCD)

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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