High Frequency LLC Resonant Converter with Magnetic Shunt Integrated Planar Transformer

Mingxiao Li, Ziwei Ouyang*, Michael A. E. Andersen

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

LLC resonant converter has been proved as an excellent candidate to achieve high efficiency and power density. To achieve smaller size of passive components, the resonant inductor in LLC converter is usually integrated into the transformer by utilizing its leakage inductance. However, leakage inductance of transformer is usually insufficient and thus the LLC converter has to be operated in a limited frequency range, otherwise the power efficiency will drop dramatically. Therefore, a larger resonant inductance in LLC converter is expected to operate in a wider input voltage range. This paper proposes a new method to create a larger resonant inductance by using a magnetic shunt integrated into planar windings. Accurate leakage inductance modelling, calculation and optimal design guideline for LLC transformer are presented. A 280-380V input and output 48V-100W half bridge LLC resonant converter with 1 MHz resonant frequency is built to verify the design methodology. A comparison is made between the converter with magnetic shunt integrated transformer and the other with traditional planar transformer without magnetic shunt. Experimental results show the proposed converter with magnetic shunt can greatly narrow switching frequency range and thus achieve high efficiency under a wider input range
Original languageEnglish
JournalI E E E Transactions on Power Electronics
Volume34
Issue number3
Pages (from-to)2405 - 2415
ISSN0885-8993
DOIs
Publication statusPublished - 2018

Keywords

  • Magnetic shunt
  • LLC resonant converter
  • Planar transformer
  • High frequency
  • Wide input voltage

Cite this

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title = "High Frequency LLC Resonant Converter with Magnetic Shunt Integrated Planar Transformer",
abstract = "LLC resonant converter has been proved as an excellent candidate to achieve high efficiency and power density. To achieve smaller size of passive components, the resonant inductor in LLC converter is usually integrated into the transformer by utilizing its leakage inductance. However, leakage inductance of transformer is usually insufficient and thus the LLC converter has to be operated in a limited frequency range, otherwise the power efficiency will drop dramatically. Therefore, a larger resonant inductance in LLC converter is expected to operate in a wider input voltage range. This paper proposes a new method to create a larger resonant inductance by using a magnetic shunt integrated into planar windings. Accurate leakage inductance modelling, calculation and optimal design guideline for LLC transformer are presented. A 280-380V input and output 48V-100W half bridge LLC resonant converter with 1 MHz resonant frequency is built to verify the design methodology. A comparison is made between the converter with magnetic shunt integrated transformer and the other with traditional planar transformer without magnetic shunt. Experimental results show the proposed converter with magnetic shunt can greatly narrow switching frequency range and thus achieve high efficiency under a wider input range",
keywords = "Magnetic shunt, LLC resonant converter, Planar transformer, High frequency, Wide input voltage",
author = "Mingxiao Li and Ziwei Ouyang and Andersen, {Michael A. E.}",
year = "2018",
doi = "10.1109/TPEL.2018.2842029",
language = "English",
volume = "34",
pages = "2405 -- 2415",
journal = "I E E E Transactions on Power Electronics",
issn = "0885-8993",
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High Frequency LLC Resonant Converter with Magnetic Shunt Integrated Planar Transformer. / Li, Mingxiao; Ouyang, Ziwei; Andersen, Michael A. E.

In: I E E E Transactions on Power Electronics, Vol. 34, No. 3, 2018, p. 2405 - 2415.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - High Frequency LLC Resonant Converter with Magnetic Shunt Integrated Planar Transformer

AU - Li, Mingxiao

AU - Ouyang, Ziwei

AU - Andersen, Michael A. E.

PY - 2018

Y1 - 2018

N2 - LLC resonant converter has been proved as an excellent candidate to achieve high efficiency and power density. To achieve smaller size of passive components, the resonant inductor in LLC converter is usually integrated into the transformer by utilizing its leakage inductance. However, leakage inductance of transformer is usually insufficient and thus the LLC converter has to be operated in a limited frequency range, otherwise the power efficiency will drop dramatically. Therefore, a larger resonant inductance in LLC converter is expected to operate in a wider input voltage range. This paper proposes a new method to create a larger resonant inductance by using a magnetic shunt integrated into planar windings. Accurate leakage inductance modelling, calculation and optimal design guideline for LLC transformer are presented. A 280-380V input and output 48V-100W half bridge LLC resonant converter with 1 MHz resonant frequency is built to verify the design methodology. A comparison is made between the converter with magnetic shunt integrated transformer and the other with traditional planar transformer without magnetic shunt. Experimental results show the proposed converter with magnetic shunt can greatly narrow switching frequency range and thus achieve high efficiency under a wider input range

AB - LLC resonant converter has been proved as an excellent candidate to achieve high efficiency and power density. To achieve smaller size of passive components, the resonant inductor in LLC converter is usually integrated into the transformer by utilizing its leakage inductance. However, leakage inductance of transformer is usually insufficient and thus the LLC converter has to be operated in a limited frequency range, otherwise the power efficiency will drop dramatically. Therefore, a larger resonant inductance in LLC converter is expected to operate in a wider input voltage range. This paper proposes a new method to create a larger resonant inductance by using a magnetic shunt integrated into planar windings. Accurate leakage inductance modelling, calculation and optimal design guideline for LLC transformer are presented. A 280-380V input and output 48V-100W half bridge LLC resonant converter with 1 MHz resonant frequency is built to verify the design methodology. A comparison is made between the converter with magnetic shunt integrated transformer and the other with traditional planar transformer without magnetic shunt. Experimental results show the proposed converter with magnetic shunt can greatly narrow switching frequency range and thus achieve high efficiency under a wider input range

KW - Magnetic shunt

KW - LLC resonant converter

KW - Planar transformer

KW - High frequency

KW - Wide input voltage

U2 - 10.1109/TPEL.2018.2842029

DO - 10.1109/TPEL.2018.2842029

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JO - I E E E Transactions on Power Electronics

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