IDEAS home Printed from https://ideas.repec.org/a/gam/jeners/v14y2021i12p3606-d576604.html
   My bibliography  Save this article

Analysis of Three-Phase Wye-Delta Connected LLC

Author

Listed:
  • Jing-Yuan Lin

    (Department of Electronic and Computer Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan)

  • Chuan-Ting Chen

    (Department of Electronic and Computer Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan)

  • Kuan-Hung Chen

    (Department of Electronic and Computer Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan)

  • Yi-Feng Lin

    (Department of Electronic and Computer Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan)

Abstract

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%.

Suggested Citation

  • Jing-Yuan Lin & Chuan-Ting Chen & Kuan-Hung Chen & Yi-Feng Lin, 2021. "Analysis of Three-Phase Wye-Delta Connected LLC," Energies, MDPI, vol. 14(12), pages 1-19, June.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:12:p:3606-:d:576604
    as

    Download full text from publisher

    File URL: https://www.mdpi.com/1996-1073/14/12/3606/pdf
    Download Restriction: no
    File URL: https://www.mdpi.com/1996-1073/14/12/3606/
    Download Restriction: no
    ---><---

    Corrections

    All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:gam:jeners:v:14:y:2021:i:12:p:3606-:d:576604. See general information about how to correct material in RePEc.

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    We have no bibliographic references for this item. You can help adding them by using this form .

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: MDPI Indexing Manager (email available below). General contact details of provider: https://www.mdpi.com .

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.

    IDEAS is a RePEc service. RePEc uses bibliographic data supplied by the respective publishers.