Analysis and design of bidirectional CLLLC resonant DC-DC transformers

Qichao Chen; Yanchao Ji; Jianze Wang

doi:10.13334/j.0258-8013.pcsee.2014.18.005

Analysis and design of bidirectional CLLLC resonant DC-DC transformers

Qichao Chen^*
, Yanchao Ji
, Jianze Wang

^*Corresponding author for this work

School of Electrical Engineering and Automation, Harbin Institute of Technology

Research output: Contribution to journal › Article › peer-review

60 Scopus citations

Abstract

A bidirectional full-bridge CLLLC resonant converter is proposed based on the LLC resonant converter due to its advantages in achieving high efficiency and high power density. The proposed converter is fully soft switched and totally snubberless. Aiming at the application to DC-DC transformers, an improved design method is proposed based on detailed analysis about CLLLC converter's voltage gain characteristic, soft switching restriction and efficiency with the first harmonic approximation method. Finally, a prototype which interfaces 400~48 V dc buses with a power rating of 1kW was built. Using the prototype converter, experimental results were obtained to verify the performance of the proposed topology and design method. The highest applicable conversion efficiencies for the bidirectional operational modes exceed 95%.

Original language	English
Pages (from-to)	2898-2905
Number of pages	8
Journal	Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering
Volume	34
Issue number	18
DOIs	https://doi.org/10.13334/j.0258-8013.pcsee.2014.18.005
State	Published - 25 Jun 2014
Externally published	Yes

Keywords

Bidirectional converter
DC-DC transformer
First harmonic approximation method
LLC resonant converter
Soft switching

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10.13334/j.0258-8013.pcsee.2014.18.005

Cite this

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title = "Analysis and design of bidirectional CLLLC resonant DC-DC transformers",

abstract = "A bidirectional full-bridge CLLLC resonant converter is proposed based on the LLC resonant converter due to its advantages in achieving high efficiency and high power density. The proposed converter is fully soft switched and totally snubberless. Aiming at the application to DC-DC transformers, an improved design method is proposed based on detailed analysis about CLLLC converter's voltage gain characteristic, soft switching restriction and efficiency with the first harmonic approximation method. Finally, a prototype which interfaces 400\textasciitilde{}48 V dc buses with a power rating of 1kW was built. Using the prototype converter, experimental results were obtained to verify the performance of the proposed topology and design method. The highest applicable conversion efficiencies for the bidirectional operational modes exceed 95\%.",

keywords = "Bidirectional converter, DC-DC transformer, First harmonic approximation method, LLC resonant converter, Soft switching",

author = "Qichao Chen and Yanchao Ji and Jianze Wang",

year = "2014",

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doi = "10.13334/j.0258-8013.pcsee.2014.18.005",

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publisher = "Chinese Society for Electrical Engineering",

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TY - JOUR

T1 - Analysis and design of bidirectional CLLLC resonant DC-DC transformers

AU - Chen, Qichao

AU - Ji, Yanchao

AU - Wang, Jianze

PY - 2014/6/25

Y1 - 2014/6/25

N2 - A bidirectional full-bridge CLLLC resonant converter is proposed based on the LLC resonant converter due to its advantages in achieving high efficiency and high power density. The proposed converter is fully soft switched and totally snubberless. Aiming at the application to DC-DC transformers, an improved design method is proposed based on detailed analysis about CLLLC converter's voltage gain characteristic, soft switching restriction and efficiency with the first harmonic approximation method. Finally, a prototype which interfaces 400~48 V dc buses with a power rating of 1kW was built. Using the prototype converter, experimental results were obtained to verify the performance of the proposed topology and design method. The highest applicable conversion efficiencies for the bidirectional operational modes exceed 95%.

AB - A bidirectional full-bridge CLLLC resonant converter is proposed based on the LLC resonant converter due to its advantages in achieving high efficiency and high power density. The proposed converter is fully soft switched and totally snubberless. Aiming at the application to DC-DC transformers, an improved design method is proposed based on detailed analysis about CLLLC converter's voltage gain characteristic, soft switching restriction and efficiency with the first harmonic approximation method. Finally, a prototype which interfaces 400~48 V dc buses with a power rating of 1kW was built. Using the prototype converter, experimental results were obtained to verify the performance of the proposed topology and design method. The highest applicable conversion efficiencies for the bidirectional operational modes exceed 95%.

KW - Bidirectional converter

KW - DC-DC transformer

KW - First harmonic approximation method

KW - LLC resonant converter

KW - Soft switching

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U2 - 10.13334/j.0258-8013.pcsee.2014.18.005

DO - 10.13334/j.0258-8013.pcsee.2014.18.005

M3 - 文章

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SN - 0258-8013

VL - 34

SP - 2898

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JO - Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering

JF - Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering

IS - 18

ER -

Analysis and design of bidirectional CLLLC resonant DC-DC transformers

Abstract

Keywords

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