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Title: S-Hybrid Step-Down DC-DC Converter-Analysis of Operation and Design Considerations

Abstract

This paper presents a new highly integrable hybrid step-down converter that merges switched-inductor (SI) and switched-capacitor (SC) operations and significantly reduces onboard loss by using the input cable's parasitic inductance as its main inductor. This converter has the inductor placed at the input with a smaller voltage swing, leading to possible use of a smaller inductor and low-voltage rating switches that generally translate to reduced conduction losses. Analyses of converter operation and losses to reveal its original characteristics and design guidelines are presented to facilitate the components optimization. The converter architecture is verified by a proof-of-concept 15-W inductor-less lithium-ion battery charger prototype that uses a 1-m USB 3.0 cable as inductor. The converter, switched at 2 MHz from a 5-V input, experimentally achieves 89.7% peak efficiency and 6% higher efficiency at full load than a Buck converter counterpart. This high efficiency and zero onboard inductor yield a relative 45.7% onboard loss reduction at full load, promising excellent integration feasibility and superior system thermal management.

Authors:
 [1];  [2]
  1. National Renewable Energy Lab. (NREL), Golden, CO (United States)
  2. Univ. of Colorado, Boulder, CO (United States)
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE National Renewable Energy Laboratory (NREL), Laboratory Directed Research and Development (LDRD) Program
OSTI Identifier:
1503818
Report Number(s):
NREL/JA-5D00-73128
Journal ID: ISSN 0278-0046
Grant/Contract Number:  
AC36-08GO28308
Resource Type:
Accepted Manuscript
Journal Name:
IEEE Translations on Industrial Electronics
Additional Journal Information:
Journal Name: IEEE Translations on Industrial Electronics; Journal ID: ISSN 0278-0046
Publisher:
IEEE
Country of Publication:
United States
Language:
English
Subject:
24 POWER TRANSMISSION AND DISTRIBUTION; Buck converter; DC-DC; inductor-less power converter; S-Hybrid converter; step-down power conversion; smart power cable

Citation Formats

Seo, Gab -Su, and Le, Hanh -Phuc. S-Hybrid Step-Down DC-DC Converter-Analysis of Operation and Design Considerations. United States: N. p., 2019. Web. doi:10.1109/TIE.2019.2897537.
Seo, Gab -Su, & Le, Hanh -Phuc. S-Hybrid Step-Down DC-DC Converter-Analysis of Operation and Design Considerations. United States. doi:10.1109/TIE.2019.2897537.
Seo, Gab -Su, and Le, Hanh -Phuc. Wed . "S-Hybrid Step-Down DC-DC Converter-Analysis of Operation and Design Considerations". United States. doi:10.1109/TIE.2019.2897537.
@article{osti_1503818,
title = {S-Hybrid Step-Down DC-DC Converter-Analysis of Operation and Design Considerations},
author = {Seo, Gab -Su and Le, Hanh -Phuc},
abstractNote = {This paper presents a new highly integrable hybrid step-down converter that merges switched-inductor (SI) and switched-capacitor (SC) operations and significantly reduces onboard loss by using the input cable's parasitic inductance as its main inductor. This converter has the inductor placed at the input with a smaller voltage swing, leading to possible use of a smaller inductor and low-voltage rating switches that generally translate to reduced conduction losses. Analyses of converter operation and losses to reveal its original characteristics and design guidelines are presented to facilitate the components optimization. The converter architecture is verified by a proof-of-concept 15-W inductor-less lithium-ion battery charger prototype that uses a 1-m USB 3.0 cable as inductor. The converter, switched at 2 MHz from a 5-V input, experimentally achieves 89.7% peak efficiency and 6% higher efficiency at full load than a Buck converter counterpart. This high efficiency and zero onboard inductor yield a relative 45.7% onboard loss reduction at full load, promising excellent integration feasibility and superior system thermal management.},
doi = {10.1109/TIE.2019.2897537},
journal = {IEEE Translations on Industrial Electronics},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {2}
}

Journal Article:
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This content will become publicly available on February 13, 2020
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