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Institute of Korean Electrical and Electronics Engineers (한국전기전자학회)
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A study on an optimal design of the high frequency transformer in LLC DC to DC resonant converter

LLC DC to DC 공진 컨버터의 고주파 변압기 최적화 설계에 관한 연구

  • Jong-Hae Kim (Department of Electrical Engineering, Daegu Catholic University)
  • Received : 2023.12.11
  • Accepted : 2023.12.26
  • Published : 2023.12.31
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Abstract

This paper presents an optimal design of the slim type high frequency transformer used in the LLC DC to DC resonant converter for 65-inch UHD-TV with the rated power of 315W. This paper also performs an optimal design of the slim type high frequency through core loss analysis, AC winding loss analysis, and optimization design of the winding arrangement of the LLC resonant transformer. Particularly, the high-efficiency and slim type high frequency transformer based on the obtained results from theoretical analysis in this paper is constructed in the interleaved and vertical winding structures of its transformer to realize the winding method of automatic type and minimize AC winding loss. The primary and secondary windings of the slim type high frequency transformer the vertical winding structure proposed in this paper used the Litz-wire windings, PCB and copper plate windings, respectively. Finally, an optimal design of the slim type high frequency transformer proposed in this paper was carried out through the experimental results to confirm the validity of theoretical analysis based on the simulation results using Maxwell 2D and 3D tool.

본 논문에서는 315W급 65인치 UHD-TV용 LLC DC to DC 공진 컨버터에 사용되고 있는 Slim형 고주파 변압기의 최적화 설계에 대해서 나타낸다. 또한 본 논문에서는 LLC 공진 변압기의 코어 손실 분석, AC 권선 손실 분석 및 권선 배치 최적화 설계를 통해 Slim형 고주파 변압기의 최적화 설계를 수행한다. 특히 본 논문에서는 이론적으로 해석하여 얻어진 결과를 토대로 고효율 및 Slim형 고주파 변압기는 교류 권선 손실 최소화 및 권선 자동화를 위하여 인터리브 및 수직형 권선 구조로 구성한다. 본 논문 제안한 수직형 권선 구조 방식의 Slim형 고주파 변압기의 1차측 권선은 Litz 권선을 2차 권선은 PCB와 동판 권선을 사용하였다. 최종적으로 Maxwell 2D 및 3D Tool을 이용한 시뮬레이션 결과를 토대로 이론 해석의 정당성을 입증하기 위해서 실험 결과를 통해 본 논문에서 제안한 Slim형 고주파 변압기의 최적화 설계를 수행하였다.

Keywords

Acknowledgement

This work was supported by research grant from Daegu Catholic University in 2023

References

  1. J. H. Kim, I. W. Lee, J. W. Kim, J. S. Won, D. S. Oh., J. S. Kim, "Technical Trends of Power Electronics and Flat Panle Display," 2009 Power Electronics Annual Conference, pp.201-204, 2009.
  2. M. Rascon, R. Prieto, O. Garcia, J. A. Cobos and J. Uceda, "Design of very low profile magnetic components using flex foils," Proceedings of APEC 97-Applied Power Electronics Conference, pp.561-567, 1997. DOI: 10. 1109/APEC. 1997.575614 https://doi.org/10.1109/APEC.1997.575614
  3. J. Biela, and J.W. Kolar, "Electromagnetic integration of high power resonant circuits comprising high leakage inductance transformers," 2004 35th IEEE Annual Power Electronics Specialists Conference, vol.6, pp.4537-4545, 2004. DOI: 10.1109/PESC.2004.1354802
  4. Eleftherios I. Amoiralis, Marina A. Tsili and Antonios G. Kladas, "Transformer Design and Optimization: A Literature Survey," IEEE Transactions on Power Delivery, vol. 24, no.4, pp.1999-2024, 2009. DOI: 10.1109/TPWRD.2009.2028763
  5. C. Quinn, K. Rinne, T. O'Donnell, M. Duffy and C. O. Mathuna, "A review of planar magnetic techniques and technologies," Sixteenth Annual IEEE Applied Power Electronics Conference and Exposition, vol.2, pp.1175-1183, 2001. DOI: 10.1109/APEC. 2001.912514
  6. M. T. Quirke, J. J. Barrett, and M. Hayes, "Planar magnetic component technology-a review," IEEE Transactions on Components, Hybrids, and Manufacturing Technology, vol. 15, no.5, pp.884-892, 1992. DOI: 10.1109/33.180055
  7. Hwa-Pyeong Park, Jee-Hoon Jung, "Design and Implementation of 500 kHz High Frequency LLC Resonant Converter for High Power Density," The Transaction of the Korean Institute of Power Electronics, vol.20. no.1, pp.51-58, 2015. DOI:10.6113/TKPE.2015.20.1.51
  8. Jae-Hee Park, Rae-Young Kim, "Analysis, Design Method of Integrated Transformer Structure Adjusting Leakage Inductance for LLC Resonant Converter," The 52th KIEE Summer Conference, pp.1227-1228,
  9. D. H. Lee, K. H. Phuc, K. H. Kim, S. W. Choi, "700kHz GaN-based Low-Profile LDC for 800V EV," 2021 Power Electronics Annual Conference, pp.171-173,
  10. Jae-Gon Yoo, Jong-Soo Kim, "Design and Analysis of 10kW High-frequency Planar Transformer for Arc Welding Machine," The Transactions of the Korean Institute of Electrical Engineers, vol. 71, no.12. pp.1780-1786, December, 2021. https://doi.org/10.5370/KIEE.2022.71.12.1780
  11. M. S. Jeon, G. Y. Lee, R. Y. Kim, "High Density, High Frequency Planar Transformer Based on Interleaved Serpentine Winding with Low Parasitic Capacitance of LLC Resonant Converter for Fuel Cell," 2022 Power Electronics Annual Conference, pp.43-45, 2022.
  12. Dong-kyun Kim, Chan-bae Park, Jae-Bum Lee, "Design and Analysis of 12kW Multiple Resonant LLC Converter with Parallel-Input and Series-Output," The Transaction of the Korean Institute of Electrical Engineers, vol.70. no.10, pp.1569-1579, 2021. DOI: 10.5370/KIEE 2021.70.10.1569
  13. Daniel Whitman and Marian K. Kazimierczuk, "An Analytical Correction to Dowell's Equation for Inductor and Transformer Winding Losses Using Cylindrical Coordinates," IEEE Transactions on Power Electronics, vol.34, no.11, pp.10425-10432, 2019. DOI: 10.1109/TPEL.2019.2904582
  14. A V Bashkirov, V V Glotov, N Yu Veretennikov, V M Pitolin A S Demikhova, "Analysis of methods and means for estimating losses in magnetic components caused by proximity effect and skin effect," International Conference on IT in Business and Industry(ITBI2021), DOI :10.1088/1742-6596/2032/1/012001