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

doi:10.1109/ESSCIRC53450.2021.9567889

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 proceeding › Conference 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 language	English (US)
Title of host publication	ESSCIRC 2021 - IEEE 47th European Solid State Circuits Conference, Proceedings
Publisher	Institute of Electrical and Electronics Engineers Inc.
Pages	315-318
Number of pages	4
ISBN (Electronic)	9781665437479
DOIs	https://doi.org/10.1109/ESSCIRC53450.2021.9567889
State	Published - Sep 13 2021
Event	47th IEEE European Solid State Circuits Conference, ESSCIRC 2021 - Virtual, Online, France Duration: Sep 6 2021 → Sep 9 2021

Publication series

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

Conference

Conference	47th IEEE European Solid State Circuits Conference, ESSCIRC 2021
Country/Territory	France
City	Virtual, Online
Period	9/6/21 → 9/9/21

Keywords

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

ASJC Scopus subject areas

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

Access to Document

10.1109/ESSCIRC53450.2021.9567889

Cite this

Cho, D., Shin, H., Park, H., Oh, S., Lee, T., Ha, S., Kim, C., & Je, M. (2021). 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. In ESSCIRC 2021 - IEEE 47th European Solid State Circuits Conference, Proceedings (pp. 315-318). (ESSCIRC 2021 - IEEE 47th European Solid State Circuits Conference, Proceedings). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/ESSCIRC53450.2021.9567889

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. / Cho, Donghee; Shin, Hongseok; Park, Hyunwoo et al.
ESSCIRC 2021 - IEEE 47th European Solid State Circuits Conference, Proceedings. Institute of Electrical and Electronics Engineers Inc., 2021. p. 315-318 (ESSCIRC 2021 - IEEE 47th European Solid State Circuits Conference, Proceedings).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Cho, D, Shin, H, Park, H, Oh, S, Lee, T, Ha, S, Kim, C & Je, M 2021, 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. in ESSCIRC 2021 - IEEE 47th European Solid State Circuits Conference, Proceedings. ESSCIRC 2021 - IEEE 47th European Solid State Circuits Conference, Proceedings, Institute of Electrical and Electronics Engineers Inc., pp. 315-318, 47th IEEE European Solid State Circuits Conference, ESSCIRC 2021, Virtual, Online, France, 9/6/21. https://doi.org/10.1109/ESSCIRC53450.2021.9567889

Cho D, Shin H, Park H, Oh S, Lee T, Ha S et al. 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. In ESSCIRC 2021 - IEEE 47th European Solid State Circuits Conference, Proceedings. Institute of Electrical and Electronics Engineers Inc. 2021. p. 315-318. (ESSCIRC 2021 - IEEE 47th European Solid State Circuits Conference, Proceedings). doi: 10.1109/ESSCIRC53450.2021.9567889

Cho, Donghee ; Shin, Hongseok ; Park, Hyunwoo et al. / 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. ESSCIRC 2021 - IEEE 47th European Solid State Circuits Conference, Proceedings. Institute of Electrical and Electronics Engineers Inc., 2021. pp. 315-318 (ESSCIRC 2021 - IEEE 47th European Solid State Circuits Conference, Proceedings).

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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

Abstract

Publication series

Conference

Keywords

ASJC Scopus subject areas

Access to Document

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