A Diode Clamped Resonant DC/DC Converter for Solid State Transformer With Inherent Second Harmonic Current Suppression

Zhiyuan Wang; Binbin Li; Rui Xue; Zhe Shao; Yingzong Jiao; Chongfu Xu; Qingshuai Pang; Drazen Dujic; Dianguo Xu

doi:10.1109/TIE.2026.3677616

A Diode Clamped Resonant DC/DC Converter for Solid State Transformer With Inherent Second Harmonic Current Suppression

Zhiyuan Wang
, Binbin Li^*
, Rui Xue
, Zhe Shao
, Yingzong Jiao
, Chongfu Xu
, Qingshuai Pang
, Drazen Dujic
, Dianguo Xu

^*Corresponding author for this work

School of Electrical Engineering and Automation, Harbin Institute of Technology
Xi'an Xd Power Electronics Company Ltd.
Swiss Federal Institute of Technology Lausanne

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

Abstract

The solid-state transformer (SST) provides an efficient and compact solution for data center and EV charging applications. However, the intrinsic single-phase structure of AC/DC stage in SST generates the second harmonic current (SHC) on the DC-link. It propagates through the DC/DC stage and causes increased current stress and losses. In this article, the detrimental impact of SHC on the traditional series resonant converter is investigated. Then, a novel SHC suppression method based on the diode-clamped resonant converter (DC-RC) is proposed. The operation principle and impedance characteristic of DC-RC are revealed. Meanwhile, the SHC suppression mechanism, along with its parameter design method, is presented. The SHC in the DC/DC stage can be suppressed automatically without any additional control or power stage. Finally, the validity of the proposed method is verified experimentally on the 18 kW-rated prototype.

Original language	English
Journal	IEEE Transactions on Industrial Electronics
DOIs	https://doi.org/10.1109/TIE.2026.3677616
State	Accepted/In press - 2026
Externally published	Yes

Keywords

Data center
EV charging
resonant converter
second harmonic current (SHC)
solid-state transformer (SST)

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10.1109/TIE.2026.3677616

Cite this

@article{780a9cf5b2fc4a6690147e24e678adcd,

title = "A Diode Clamped Resonant DC/DC Converter for Solid State Transformer With Inherent Second Harmonic Current Suppression",

abstract = "The solid-state transformer (SST) provides an efficient and compact solution for data center and EV charging applications. However, the intrinsic single-phase structure of AC/DC stage in SST generates the second harmonic current (SHC) on the DC-link. It propagates through the DC/DC stage and causes increased current stress and losses. In this article, the detrimental impact of SHC on the traditional series resonant converter is investigated. Then, a novel SHC suppression method based on the diode-clamped resonant converter (DC-RC) is proposed. The operation principle and impedance characteristic of DC-RC are revealed. Meanwhile, the SHC suppression mechanism, along with its parameter design method, is presented. The SHC in the DC/DC stage can be suppressed automatically without any additional control or power stage. Finally, the validity of the proposed method is verified experimentally on the 18 kW-rated prototype.",

keywords = "Data center, EV charging, resonant converter, second harmonic current (SHC), solid-state transformer (SST)",

author = "Zhiyuan Wang and Binbin Li and Rui Xue and Zhe Shao and Yingzong Jiao and Chongfu Xu and Qingshuai Pang and Drazen Dujic and Dianguo Xu",

note = "Publisher Copyright: {\textcopyright} 1982-2012 IEEE.",

year = "2026",

doi = "10.1109/TIE.2026.3677616",

language = "英语",

journal = "IEEE Transactions on Industrial Electronics",

issn = "0278-0046",

publisher = "Institute of Electrical and Electronics Engineers Inc.",

}

TY - JOUR

T1 - A Diode Clamped Resonant DC/DC Converter for Solid State Transformer With Inherent Second Harmonic Current Suppression

AU - Wang, Zhiyuan

AU - Li, Binbin

AU - Xue, Rui

AU - Shao, Zhe

AU - Jiao, Yingzong

AU - Xu, Chongfu

AU - Pang, Qingshuai

AU - Dujic, Drazen

AU - Xu, Dianguo

PY - 2026

Y1 - 2026

N2 - The solid-state transformer (SST) provides an efficient and compact solution for data center and EV charging applications. However, the intrinsic single-phase structure of AC/DC stage in SST generates the second harmonic current (SHC) on the DC-link. It propagates through the DC/DC stage and causes increased current stress and losses. In this article, the detrimental impact of SHC on the traditional series resonant converter is investigated. Then, a novel SHC suppression method based on the diode-clamped resonant converter (DC-RC) is proposed. The operation principle and impedance characteristic of DC-RC are revealed. Meanwhile, the SHC suppression mechanism, along with its parameter design method, is presented. The SHC in the DC/DC stage can be suppressed automatically without any additional control or power stage. Finally, the validity of the proposed method is verified experimentally on the 18 kW-rated prototype.

AB - The solid-state transformer (SST) provides an efficient and compact solution for data center and EV charging applications. However, the intrinsic single-phase structure of AC/DC stage in SST generates the second harmonic current (SHC) on the DC-link. It propagates through the DC/DC stage and causes increased current stress and losses. In this article, the detrimental impact of SHC on the traditional series resonant converter is investigated. Then, a novel SHC suppression method based on the diode-clamped resonant converter (DC-RC) is proposed. The operation principle and impedance characteristic of DC-RC are revealed. Meanwhile, the SHC suppression mechanism, along with its parameter design method, is presented. The SHC in the DC/DC stage can be suppressed automatically without any additional control or power stage. Finally, the validity of the proposed method is verified experimentally on the 18 kW-rated prototype.

KW - Data center

KW - EV charging

KW - resonant converter

KW - second harmonic current (SHC)

KW - solid-state transformer (SST)

UR - https://www.scopus.com/pages/publications/105039208848

U2 - 10.1109/TIE.2026.3677616

DO - 10.1109/TIE.2026.3677616

M3 - 文章

AN - SCOPUS:105039208848

SN - 0278-0046

JO - IEEE Transactions on Industrial Electronics

JF - IEEE Transactions on Industrial Electronics

ER -

A Diode Clamped Resonant DC/DC Converter for Solid State Transformer With Inherent Second Harmonic Current Suppression

Abstract

Keywords

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