A Load-Current-Regulating OLED Lamp Driver Using a Hybrid Step-Up Converter with 93.21% Efficiency at a High Conversion Ratio of 4.1

Donghee Cho, Hongseok Shin, Hyunwoo Park, Sein Oh, Taeju Lee, Sohmyung Ha, Chul Kim, Minkyu Je

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In this paper, we present a load-current-regulating OLED driver for wearable light therapy devices. The driver is based on a single-stage DC-DC hybrid step-up converter architecture achieving high efficiency at a high conversion ratio. The hybrid topology building up the energy through two parallel paths - one with an inductor and the other with a flying capacitor (CFLY1) - reduces the power loss induced by a large DC resistance (RDCR) of the inductor. Another flying capacitor (CFLY2), which drives a negative voltage, reduces switching loss by lowering the voltage stress of power switches at a high conversion ratio. More importantly, the proposed single-stage architecture directly regulates the load current to improve efficiency by eliminating the additional current-regulation element, such as a sense resistor or a current source. 93.21% peak efficiency is achieved even with a large RDCR of 200mΩ at a high conversion ratio of 4.1.

Original languageEnglish (US)
Title of host publicationESSCIRC 2021 - IEEE 47th European Solid State Circuits Conference, Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages315-318
Number of pages4
ISBN (Electronic)9781665437479
DOIs
StatePublished - Sep 13 2021
Event47th IEEE European Solid State Circuits Conference, ESSCIRC 2021 - Virtual, Online, France
Duration: Sep 6 2021Sep 9 2021

Publication series

NameESSCIRC 2021 - IEEE 47th European Solid State Circuits Conference, Proceedings

Conference

Conference47th IEEE European Solid State Circuits Conference, ESSCIRC 2021
Country/TerritoryFrance
CityVirtual, Online
Period9/6/219/9/21

Keywords

  • high conversion ratio
  • hybrid step-up converter
  • load current regulation
  • OLED lamp driver
  • wearable light therapy device

ASJC Scopus subject areas

  • Artificial Intelligence
  • Hardware and Architecture
  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials

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