Contactless DC connector based on GaN LLC converter for next generation data centers

Hayashi, Yusuke; Toyoda, Hajime; Ise, Toshifumi; Matsumoto, Akira

doi:10.1109/ipec.2014.6869792

Cited by 9 publications

(8 citation statements)

References 10 publications

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“…Volumes generated from the inductor and the heat sink were considered here. The heat sink volume was estimated simply by using the heat dissipation efficiency k HS of 0.65 W/cm 3 taking the forced-air cooling in data centers into account [22]. From Fig.…”

Section: High Power Density Design Methodologymentioning

confidence: 99%

Design Consideration for High Power Density GaN Buck-Rectifier in ISOP-IPOS Converter based dc Distribution System

Hayashi¹,

Matsumoto²

2015

JEPE

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GaN (gallium nitride) buck-rectifier has been proposed to realize high power density ISOP (input series and output parallel)-IPOS (input parallel and output series) converter-based dc distribution system. The ultra-low loss bi-directional switch can be developed by the GaN power device because of the low on-resistance, the high-speed switching behavior and its own device structure. The buck-rectifier using the GaN bi-directional switches has the potential to achieve higher power density than the commonly utilized boost-rectifier. Availability of the GaN-HEMT (high electron mobility transistor) for the buck rectifier has been verified taking the theoretical limit of the on-resistance and the switching loss energy into account. Design consideration for a high power density buck-rectifier has been also conducted and the application effect of the GaN bidirectional switches has been evaluated quantitatively. The ISOP-IPOS converter-based dc (direct current) distribution system takes full advantage of the buck-rectifier and the rectifier using GaN devices contributes to realizing higher power density dc distribution system.

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Section: High Power Density Design Methodologymentioning

confidence: 99%

Design Consideration for High Power Density GaN Buck-Rectifier in ISOP-IPOS Converter based dc Distribution System

Hayashi¹,

Matsumoto²

2015

JEPE

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“…The loss analysis and the volume estimation has been already carried out for the LLC resonant dc-dc converter using the high frequency transformer (19) . The circuit configuration corresponded to Fig.…”

Section: Volume and Power Loss Estimation Of Passive Components In DCmentioning

confidence: 99%

Capacitively Isolated Multicell Dc-Dc Transformer for Future Dc Distribution System

2017

Self Cite

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This paper proposes a new capacitively isolated multicell dc-dc transformer (dcx). The proposed dcx consists of dc-dc cell converters with pairs of isolation capacitors that substitute for high frequency transformers. The capacitively isolated cell converter achieves higher efficiency compared with the conventional inductively isolated dc-dc converter because of no transformers. The multicell approach also accomplishes the various voltage transformation ratios based on the input-series-and-output-parallel and input-parallel-and-output-series connections of the cell converters, overcoming the drawback of the capacively isolated converter with the fixed voltage transformation ratio. The analysis of the isolation voltage-sharing across the capacitors was conducted to show the feasibility of the proposed multicell dcx. The prototype of the 96 V-24 V, 200 W dcx using two 48 V-24 V, 100 W capacitively isolated dc-dc cell converters was also fabricated to confirm the validity of the analysis. The proposed approach contributes to the achievement of highly efficient and scalable power converters to realize future low-carbon societies.

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“…The design method of LLC converter resonant parameters has already been thoroughly detailed in many papers [1, 2]. However, the design difficulties of converter hardware are becoming more and more challenging as the switching speed is increasing, especially when the emerging gallium nitride (GaN) high‐electron‐mobility transistor (HEMT) are adopted [3, 4].…”

Section: Introductionmentioning

confidence: 99%

Virtual prototype and GaN HEMT based high frequency LLC converter design

Xiao

Zhao

et al. 2019

J. eng.

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Contactless DC connector based on GaN LLC converter for next generation data centers

Cited by 9 publications

References 10 publications

Design Consideration for High Power Density GaN Buck-Rectifier in ISOP-IPOS Converter based dc Distribution System

Design Consideration for High Power Density GaN Buck-Rectifier in ISOP-IPOS Converter based dc Distribution System

Capacitively Isolated Multicell Dc-Dc Transformer for Future Dc Distribution System

Virtual prototype and GaN HEMT based high frequency LLC converter design

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