Analysis and Design of an Integrated Magnetics Planar Transformer for High Power Density LLC Resonant Converter

Recent studies on compact and lightweight electronic devices have demonstrated that the LLC resonant converter (LRC) can facilitate achieving high efficiency and high power density. Moreover, employing a planar transformer can further improve the overall system power density. Although the planar tra...

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Autores principales:	Chul-Wan Park, Sang-Kyoo Han
Formato:	article
Lenguaje:	EN
Publicado:	IEEE 2021
Materias:	LLC resonant converter planar transformer integrated magnetics high frequency high-efficiency resonant converter high power density Electrical engineering. Electronics. Nuclear engineering TK1-9971
Acceso en línea:	https://doaj.org/article/da7f75b0c5b645d6b97f4507087e1065
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spelling	oai:doaj.org-article:da7f75b0c5b645d6b97f4507087e10652021-12-03T00:00:47ZAnalysis and Design of an Integrated Magnetics Planar Transformer for High Power Density LLC Resonant Converter2169-353610.1109/ACCESS.2021.3125262https://doaj.org/article/da7f75b0c5b645d6b97f4507087e10652021-01-01T00:00:00Zhttps://ieeexplore.ieee.org/document/9599678/https://doaj.org/toc/2169-3536Recent studies on compact and lightweight electronic devices have demonstrated that the LLC resonant converter (LRC) can facilitate achieving high efficiency and high power density. Moreover, employing a planar transformer can further improve the overall system power density. Although the planar transformer can assist in reducing the size of the converter, its high magnetic coupling makes the leakage inductance too small for a resonant inductor in the LRC. Therefore, an extra inductor must be employed separately, leading a considerable decrease in the power density. From this reason, significant research on integrated magnetics has been conducted to combine a transformer and external inductor into a single core. However, they require additional wires or magnetic sheets, and their structures are complex and costly. To overcome these limitations, the integrated magnetics planar transformer (IMPT) for a high power density LRC is proposed in this paper. In the proposed approach, since the primary wire is split into each side leg of the EE-type magnetic core and each operates as a transformer and a resonant inductor alternatively, an external inductor or additional wires are unnecessary. In addition, since the magnetic flux density of the IMPT is approximately equivalent to that of conventional transformer, the core size and the number of turns are almost the same. Therefore, the proposed IMPT features higher efficiency and power density without additional size and costs. To confirm the validity of the proposed IMPT, the operational principles, theoretical analysis, design considerations, and experimental results from a 350 W prototype are presented.Chul-Wan ParkSang-Kyoo HanIEEEarticleLLC resonant converterplanar transformerintegrated magneticshigh frequencyhigh-efficiency resonant converterhigh power densityElectrical engineering. Electronics. Nuclear engineeringTK1-9971ENIEEE Access, Vol 9, Pp 157499-157511 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	LLC resonant converter planar transformer integrated magnetics high frequency high-efficiency resonant converter high power density Electrical engineering. Electronics. Nuclear engineering TK1-9971
spellingShingle	LLC resonant converter planar transformer integrated magnetics high frequency high-efficiency resonant converter high power density Electrical engineering. Electronics. Nuclear engineering TK1-9971 Chul-Wan Park Sang-Kyoo Han Analysis and Design of an Integrated Magnetics Planar Transformer for High Power Density LLC Resonant Converter
description	Recent studies on compact and lightweight electronic devices have demonstrated that the LLC resonant converter (LRC) can facilitate achieving high efficiency and high power density. Moreover, employing a planar transformer can further improve the overall system power density. Although the planar transformer can assist in reducing the size of the converter, its high magnetic coupling makes the leakage inductance too small for a resonant inductor in the LRC. Therefore, an extra inductor must be employed separately, leading a considerable decrease in the power density. From this reason, significant research on integrated magnetics has been conducted to combine a transformer and external inductor into a single core. However, they require additional wires or magnetic sheets, and their structures are complex and costly. To overcome these limitations, the integrated magnetics planar transformer (IMPT) for a high power density LRC is proposed in this paper. In the proposed approach, since the primary wire is split into each side leg of the EE-type magnetic core and each operates as a transformer and a resonant inductor alternatively, an external inductor or additional wires are unnecessary. In addition, since the magnetic flux density of the IMPT is approximately equivalent to that of conventional transformer, the core size and the number of turns are almost the same. Therefore, the proposed IMPT features higher efficiency and power density without additional size and costs. To confirm the validity of the proposed IMPT, the operational principles, theoretical analysis, design considerations, and experimental results from a 350 W prototype are presented.
format	article
author	Chul-Wan Park Sang-Kyoo Han
author_facet	Chul-Wan Park Sang-Kyoo Han
author_sort	Chul-Wan Park
title	Analysis and Design of an Integrated Magnetics Planar Transformer for High Power Density LLC Resonant Converter
title_short	Analysis and Design of an Integrated Magnetics Planar Transformer for High Power Density LLC Resonant Converter
title_full	Analysis and Design of an Integrated Magnetics Planar Transformer for High Power Density LLC Resonant Converter
title_fullStr	Analysis and Design of an Integrated Magnetics Planar Transformer for High Power Density LLC Resonant Converter
title_full_unstemmed	Analysis and Design of an Integrated Magnetics Planar Transformer for High Power Density LLC Resonant Converter
title_sort	analysis and design of an integrated magnetics planar transformer for high power density llc resonant converter
publisher	IEEE
publishDate	2021
url	https://doaj.org/article/da7f75b0c5b645d6b97f4507087e1065
work_keys_str_mv	AT chulwanpark analysisanddesignofanintegratedmagneticsplanartransformerforhighpowerdensityllcresonantconverter AT sangkyoohan analysisanddesignofanintegratedmagneticsplanartransformerforhighpowerdensityllcresonantconverter
_version_	1718374018411659264

Analysis and Design of an Integrated Magnetics Planar Transformer for High Power Density LLC Resonant Converter

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