Analysis and estimation of power losses in high-power, high-frequency transformers for isolated DC/DC converters

• Autorzy: Grzejszczak Piotr , Barlik Roman , Wolski Kornel

Identyfikatory

DOI

10.24425/aee.2024.150897

• Języki publikacji: EN

Abstrakty

EN

The paper presents an in-depth analysis of the power losses in the windings and the cores of two different transformers as applied to a phase-shifted full bridge (PSFB) converter at the power level of 20–25 kW and the switching frequency of 50 kHz. The main difference in the construction of the considered devices was the method of winding realization as well as the shape and material of the cores. The influence of the winding geometry on the conduction losses was analyzed, and the losses in the cores were analytically estimated, taking into account the operating conditions of these elements in the full-bridge system with phase-shift modulation. Original resistive models of windings made of cooper sheets are presented. The obtained results were verified by experimental tests carried out in an isolated full-bridge DC/DC converter.

Słowa kluczowe

EN

high frequency power transformer; isolated DC/DC converter; DC/DC converter; power losses; proximity effect; skin effect

• Wydawca: Polish Academy of Sciences, Committee on Electrical Engineering
• Czasopismo: Archives of Electrical Engineering
• Rocznik: 2024
• Tom: Vol. 73, nr 3
• Strony: 817--830
• Opis fizyczny: Bibliogr. 17 poz., fot., rys., tab., wykr., wz.

Twórcy

autor

Grzejszczak Piotr

• Institute of Control and Industrial Electronics, Warsaw University of Technology, Koszykowa 75, 00-662 Warszawa, Poland

• https://orcid.org/0000-0001-7161-9677

autor

Barlik Roman

• Institute of Control and Industrial Electronics, Warsaw University of Technology, Koszykowa 75, 00-662 Warszawa, Poland

• https://orcid.org/0000-0002-3389-6304

autor

Wolski Kornel

• Institute of Control and Industrial Electronics, Warsaw University of Technology, Koszykowa 75, 00-662 Warszawa, Poland

• https://orcid.org/0000-0001-7723-7493

Bibliografia

• [1] Wouters H., Martinez W., Bidirectional Onboard Chargers for Electric Vehicles: State-of-the-Art and Future Trends, IEEE Transactions on Power Electronics, vol. 39, no. 1, pp. 693–716 (2024), DOI: 10.1109/TPEL.2023.3319996.
• [2] Santos N., Chaves M., Gamboa P., Cordeiro A., Santos N., Pinto S.F., High Frequency Transformers for Solid-State Transformer Applications, Applied Sciences, vol. 13, no. 12, pp. 7262 (2023), DOI: 10.3390/app13127262.
• [3] Zhang X., Xiao F., Wang R., Kang W., Yang B., Modeling and Design of High-Power Enhanced Leakage-Inductance-Integrated Medium-Frequency Transformers for DAB Converters, Energies, vol. 15, no. 4, 1361 (2022), DOI: 10.3390/en15041361.
• [4] Li Y., Wang R., Zhong L., Mao L., Sun C., Li X., Hu S., Analysis and Design of a High-Frequency Isolated Dual-Transformer DC–DC Resonant Converter, Electronics, vol. 12, no. 1, 103 (2023), DOI: 10.3390/electronics12010103.
• [5] Saket M.A., Shafiei N., Ordonez M., LLC Converters with Planar Transformers: Issues and Mitigation, IEEE Transaction on Power Electronic, vol. 32, no. 6, pp. 4524–4542 (2017), DOI: 10.1109/TPEL.2016.2602360.
• [6] Escudero M., Kutschak M.-A., Meneses D., Rodriguez N., Morales D.P., A Practical Approach to the Design of a Highly Efficient PSFB DC–DC Converter for Server Applications, Energies, vol. 12, no. 19, pp. 3723 (2019), DOI: 10.3390/en12193723.
• [7] Wolski K., Grzejszczak P., Szymczak M., Barlik R., Closed-Form Formulas for Automated Design of SiC-Based Phase-Shifted Full Bridge Converters in Charger Applications, Energies, vol. 14, no. 17, 5380 (2021), DOI: 10.3390/en14175380.
• [8] Yi Z., Sun K., Liu H., Zhang Q., Modeling and Evaluation of Ferrite Eddy Losses in High-Frequency Transformers Based on Loss-Effective Conductivity Extraction, IEEE Journal of Emerging and Selected Topics in Power Electronics, vol. 11, no. 6, pp. 5990–6004 (2023), DOI: 10.1109/JESTPE.2023.3314062.
• [9] Bahmani M.A., Thiringer T., Ortega H., An Accurate Pseudoempirical Model of Winding Loss Calculation in HF Foil and Round Conductors in Switchmode Magnetics, IEEE Transactions on Power Electronics, vol. 29, no. 8, pp. 4231–4246 (2014), DOI: 10.1109/TPEL.2013.2292593.
• [10] Dowell P.L., Effects of eddy currents in transformer windings, Proceedings of the Institution of Electrical Engineers, vol. 113, no. 8, pp. 1387–1394 (1966), DOI: 10.1049/piee.1966.0236.
• [11] Petkov R., Optimum design of a high-power, high-frequency transformer, IEEE Transactions on Power Electronics, vol. 11, no. 1, pp. 33–42 (1996), DOI: 10.1109/63.484414.
• [12] Barlik R., Nowak M., Grzejszczak P., Zdanowski M., Analytical description of power losses in a transformer operating in the dual active bridge converter, Bulletin of the Polish Academy of Sciences Technical Sciences, vol. 64, no. 3, pp. 561–574 (2016), DOI: 10.1515/bpasts-2016-0063.
• [13] Barlik R., Nowak M., Grzejszczak P., Zdanowski M., Estimation of power losses in a high-frequency planar transformer using a thermal camera, Archives of Electrical Engineering, vol. 65, no. 3, pp. 613–627 (2016), DOI: 10.1515/aee-2016-0044.
• [14] Guo Z., Yu R., Xu W., Feng X., Huang A., Design and optimization of a 200-kW medium-frequency transformer for medium-voltage SiC PV inverters, IEEE Transaction on Power Electronics, vol. 36, no. 9, pp. 10548–10560 (2021), DOI: 10.1109/TPEL.2021.3059879.
• [15] Nabih A., Jin F., Gadelrab R., Lee F.C., Li Q., Characterization and Mitigation of Dimensional Effects on Core Loss in High-Power High-Frequency Converters, IEEE Transactions on Power Electronics, vol. 38, no. 11, pp. 14017–14036 (2023), DOI: 10.1109/TPEL.2023.3285633.
• [16] www.mag-inc.com/Products/Ferrite-Cores/R-Material, accessed May 2024.
• [17] www.ferroxcube.com/upload/media/product/file/Pr_ds/E80_38_20.pdf, accessed May 2024.
• [18] https://ferroxcube.home.pl/prod/assets/3c92.pdf, accessed May 2024.