Analysis of Three-Phase Wye-Delta Connected LLC
Three-phase wye–delta LLC topology is suitable for voltage step down and high output current, and has been used in the industry for some time, e.g., for server power and EV charger. However, no comprehensive circuit analysis has been performed for three-phase wye–delta LLC. This paper provides compl...
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doaj-9a25f9921e054f1d95e8466eb1c9cf182021-07-01T00:25:35ZengMDPI AGEnergies1996-10732021-06-01143606360610.3390/en14123606Analysis of Three-Phase Wye-Delta Connected LLCJing-Yuan Lin0Chuan-Ting Chen1Kuan-Hung Chen2Yi-Feng Lin3Department of Electronic and Computer Engineering, National Taiwan University of Science and Technology, Taipei 10607, TaiwanDepartment of Electronic and Computer Engineering, National Taiwan University of Science and Technology, Taipei 10607, TaiwanDepartment of Electronic and Computer Engineering, National Taiwan University of Science and Technology, Taipei 10607, TaiwanDepartment of Electronic and Computer Engineering, National Taiwan University of Science and Technology, Taipei 10607, TaiwanThree-phase wye–delta LLC topology is suitable for voltage step down and high output current, and has been used in the industry for some time, e.g., for server power and EV charger. However, no comprehensive circuit analysis has been performed for three-phase wye–delta LLC. This paper provides complete analysis methods for three-phase wye–delta LLC. The analysis methods include circuit operation, time domain analysis, frequency domain analysis, and state–plane analysis. Circuit operation helps determine the circuit composition and operation sequence. Time domain analysis helps understand the detail operation, equivalent circuit model, and circuit equation. Frequency domain analysis helps obtain the curve of the transfer function and assists in circuit design. State–plane analysis is used for optimal trajectory control (OTC). These analyses not only can calculate the voltage/current stress, but can also help design three-phase wye-delta connected LLC and provide the OTC control reference. In addition, this paper uses PSIM simulation to verify the correctness of analysis. At the end, a 5-kW three-phase wye–delta LLC prototype is realized. The specification of the prototype is a DC input voltage of 380 V and output voltage/current of 48 V/105 A. The peak efficiency is 96.57%.https://www.mdpi.com/1996-1073/14/12/3606three-phasewye-deltaLLCsoft-switchingDC-DC converter |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Jing-Yuan Lin Chuan-Ting Chen Kuan-Hung Chen Yi-Feng Lin |
spellingShingle |
Jing-Yuan Lin Chuan-Ting Chen Kuan-Hung Chen Yi-Feng Lin Analysis of Three-Phase Wye-Delta Connected LLC Energies three-phase wye-delta LLC soft-switching DC-DC converter |
author_facet |
Jing-Yuan Lin Chuan-Ting Chen Kuan-Hung Chen Yi-Feng Lin |
author_sort |
Jing-Yuan Lin |
title |
Analysis of Three-Phase Wye-Delta Connected LLC |
title_short |
Analysis of Three-Phase Wye-Delta Connected LLC |
title_full |
Analysis of Three-Phase Wye-Delta Connected LLC |
title_fullStr |
Analysis of Three-Phase Wye-Delta Connected LLC |
title_full_unstemmed |
Analysis of Three-Phase Wye-Delta Connected LLC |
title_sort |
analysis of three-phase wye-delta connected llc |
publisher |
MDPI AG |
series |
Energies |
issn |
1996-1073 |
publishDate |
2021-06-01 |
description |
Three-phase wye–delta LLC topology is suitable for voltage step down and high output current, and has been used in the industry for some time, e.g., for server power and EV charger. However, no comprehensive circuit analysis has been performed for three-phase wye–delta LLC. This paper provides complete analysis methods for three-phase wye–delta LLC. The analysis methods include circuit operation, time domain analysis, frequency domain analysis, and state–plane analysis. Circuit operation helps determine the circuit composition and operation sequence. Time domain analysis helps understand the detail operation, equivalent circuit model, and circuit equation. Frequency domain analysis helps obtain the curve of the transfer function and assists in circuit design. State–plane analysis is used for optimal trajectory control (OTC). These analyses not only can calculate the voltage/current stress, but can also help design three-phase wye-delta connected LLC and provide the OTC control reference. In addition, this paper uses PSIM simulation to verify the correctness of analysis. At the end, a 5-kW three-phase wye–delta LLC prototype is realized. The specification of the prototype is a DC input voltage of 380 V and output voltage/current of 48 V/105 A. The peak efficiency is 96.57%. |
topic |
three-phase wye-delta LLC soft-switching DC-DC converter |
url |
https://www.mdpi.com/1996-1073/14/12/3606 |
work_keys_str_mv |
AT jingyuanlin analysisofthreephasewyedeltaconnectedllc AT chuantingchen analysisofthreephasewyedeltaconnectedllc AT kuanhungchen analysisofthreephasewyedeltaconnectedllc AT yifenglin analysisofthreephasewyedeltaconnectedllc |
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