A 96.3%-Efficiency Wide-Voltage-Range Three-Level Boost Converter With Loop-Free Self-Balancing and Dead-Zone PWM Control for Backlight LED Drivers

Junho Song, Minsu Kim, Hyunjun Park, Woojoong Jung, Youngkook Ahn, Taekyu Nam, Yoonsoo Shin, Young Jin Woo, Hyung Min Lee

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

This article proposes a high-efficiency three-level boost converter that ensures reliable operation in wide input and output voltage ranges for light-emitting diode drivers. The proposed converter adopts robust auto calibration using half of the output voltage (VOUT) for flying capacitor voltage (VCF) self-balancing without requiring additional bulky feedback loops. In addition, the proposed dead-zone pulsewidth modulation control (DZPC) overcomes the limitations of irregular switching and output ripples near the duty 0.5 boundary by alternating between mode1 (D < 0.5) and mode2 (D > 0.5) at every cycle. The prototype converter was fabricated in a 180-nm Bipolar CMOS DMOS (BCD) process occupying a silicon area of 4.72 mm2 while adopting a flying capacitor of 4.7 μF and an inductor of 10 μH. The peak efficiency was measured up to 96.3% at VIN = 24 V, VOUT = 30 V, and ILOAD = 100 mA. The proposed loop-free self-balancing verified the reliable three-level conversion regardless of duty by maintaining VCF at 0.5VOUT, while DZPC also ensures efficient and seamless operation around the duty of 0.5.

Original languageEnglish
Pages (from-to)7064-7075
Number of pages12
JournalIEEE Transactions on Power Electronics
Volume39
Issue number6
DOIs
Publication statusPublished - 2024 Jun 1

Bibliographical note

Publisher Copyright:
© 1986-2012 IEEE.

Keywords

  • Dead-zone pulse width modulation control (DZPC)
  • flying capacitor
  • light-emitting diode (LED) driver IC
  • loop-free self-balancing
  • three-level boost converter
  • wide voltage range

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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