Investigation of the Effects of Different Operating Regions of ZVS LLC Resonant Converter on the Converter Performance

Year 2024, Volume: 27 Issue: 1, 109 - 119, 29.02.2024

Salih Nacar , Selim Öncü

https://doi.org/10.2339/politeknik.1089364

Cited By: 1

Abstract

FM controlled ZVS LLC resonant converter operates with low switching losses at high switching frequencies for a wide input voltage range. To obtain a constant output voltage against varying input voltage and load, the DC voltage gain of the converter, hence its operating intervals, needs to be changed. In different operating intervals, many operating parameters change besides the DC voltage gain of the converter. In this study, ZVS operating intervals of the converter are compared in terms of efficiency, switch stresses, and soft switching for constant output voltage against varying input voltage and load. The prototype circuit of the converter with the input voltage range of 80-120 V, nominal input voltage of 100 V, and output voltage of 8 V is established. The measurement results obtained from the prototype circuit for much different input voltage and load values are presented comparatively. The effect of different ZVS operating intervals on the operating parameters of the converter is revealed in many ways. Moreover, it is observed that the operating performance of the converter around series resonance frequency is better than the operating frequencies far from this frequency value.

Keywords

LLC resonant converter, ZVS, FM control, soft switching

ZVS LLC Rezonans Dönüştürücünün Farklı Çalışma Aralıklarının Dönüştürücü Performansına Etkilerinin İncelenmesi

Abstract

FM kontrollü ZVS LLC rezonans dönüştürücü, geniş bir giriş gerilim aralığı için yüksek anahtarlama frekanslarında düşük anahtarlama kayıpları ile çalışabilmektedir. Değişen giriş gerilimi ve yüke karşı sabit çıkış gerilimi elde etmek için dönüştürücünün DC gerilim kazancının, dolayısıyla çalışma aralıklarının değiştirilmesi gerekmektedir. Farklı çalışma aralıklarında dönüştürücünün DC gerilim kazancının yanı sıra birçok çalışma parametresi de değişmektedir. Bu çalışmada dönüştürücünün ZVS çalışma aralıkları değişen giriş gerilimine ve yüke karşı sabit çıkış gerilimi için verim, anahtar stresleri ve yumuşak anahtarlama yönünden karşılaştırılmıştır. Giriş gerilim aralığı 80-120 V, nominal giriş gerilimi 100 V ve çıkış gerilimi 8 V olan dönüştürücünün prototip devresi kurulmuştur. Birçok farklı giriş gerilim ve yük değeri için prototip devre üzerinden alınan ölçüm sonuçları karşılaştırmalı bir şekilde sunulmuştur. Farklı ZVS çalışma aralıklarının dönüştürücünün çalışma parametreleri üzerindeki etkisi birçok yönden ortaya konulmuştur. Ayrıca dönüştürücünün seri rezonans frekansı civarındaki çalışma performansının, bu frekans değerinin uzağındaki çalışma frekanslarına göre daha iyi olduğu gözlemlenmiştir. 

Keywords

LLC rezonans dönüştürücü, ZVS, FM kontrol, yumuşak anahtarlama

References

• [1] Zeng J., Zhang G., Yu S. S., Zhang B. and Zhang Y., “LLC resonant converter topologies and industrial applications – Areview, Chinese Journal of Electrical Engineering, 6(3):73-84, (2020).
• [2] Menke M. F., Duranti J. P., Roggia L., Bisogno F. E., Tambara, R. V. and Seidel A. R., “Analysis and design of the LLC LED driver based on state-space representation direct time-domain solution”, IEEE Transaction on Power Electronics, 35(12): 12686-12701, (2022).
• [3] Tang C. Y., Wu H. J., Liao C. Y. and Wu H. H., “An optimal frequency-modulated hybrid MPPT algorithm fort he LLC resonant converter in PV power applications”, IEEE Transactions on Power Electronics, 37(1): 944-954, (2022).
• [4] Nacar S. and Öncü S., “Implementation of hydrogen generation system with resonant converter”, Journal of the Faculty of Engineering and Architecture of Gazi University, 37(4): 2163-2175, (2022).
• [5] Kubilay M. and Aydemir M. T., “Development of a graphical interface that can be used for LLC resonant DC-DC converter design”, Gazi University Journal of Science Part C: Design and Technology, 8(3): 632-643, (2020).
• [6] Çetin S., “A high efficiency design of LLC resonant converter for data center applications”, Gazi University Journal of Science Part C: Design and Technology, 5(1): 45-54, (2017).
• [7] Bulut, Y. E., Aşçı M. and Akın B., “Implementation of 480W LLC resonant converter”, International Journal of Environmental Pollution and Environmental Modelling, 3(1): 34-40, (2020).
• [8] Nacar, S. and Öncü S., “PI controlled LLC resonant converter”, 1st International Conference on Energy Systems Engineering, Karabük, 55-59, (2017).
• [9] Karimi S. and Tahami T., “Design optimization of high-frequency WBG-based LLC resonant converter for telecom applications”, 2018 IEEE 18th International Power Electronics and Motion Control Conference, Budapest, 72-77, (2018).
• [10] Farooq H., Khalid H. A., Khalid M. U., Farooqi M. M. and Malik Q., “Loss analysis of full bridge LLC resonant converter with wide input range using Si and SiC switches”, 2021 16th International Conference on Emerging Technologies, Islamabad, 1-6, (2021).
• [11] Glitz E. S. and Ordonez M., “MOSFET power loss estimation in LLC resonant converters: time interval analysis”, IEEE Transactions on Power Electronics, 34(12): 11964-11980, (2019).
• [12] Fei C., Gadelrab R., Li Q. and Lee F. C., “High-frequency three-phase interleaved LLC resonant converter with GaN devices and integrated planar magnetics”, IEEE Journal of Emerging and Selected Topics in Power Electronics, 7(2): 653-663, (2019).
• [13] Özçelik Ç. and Obdan A. H., “Application of 24V / 20A LLC resonant converter for OLED TVs”, Pamukkale University Journal of Engineering Sciences, 24(5): 837-845, (2018).
• [14] Zhao Z., Xu Q., Dai Y. and Yin H., “Analysis, design and implementation of improved LLC resonant transformer for efficiency enchancement”, Energies, 11(12): 1-19, (2018).
• [15] Deng J., Mi C. C., Ma R. and Li S., “Design of LLC resonant converters based on operation-mode analysis for level two PHEV battery chargers”, IEEE/ASME Transactions on Mechatronics, 20(4): 1595-1606, (2015).
• [16] Çetin S., “High efficiency design approach of a LLC resonant converter for on-board electrical vehicle battery charge applications”, Pamukkale University Journal of Engineering Sciences, 23(2): 103-111, (2017).
• [17] Hu P., Yin R., Wei B., Luo Y. and Blaabjerg F., “Modulated isolated LLC DC/DC conversion system for offshore wind farm collection and integration”, IEEE Journal of Emerging and Selected Topics in Power Electronics, 9(6): 6713-6725, (2021).
• [18] Tang C. Y., Wu H. J., Liao C. Y. and Wu H. H., “An optimal frequency-modulated hybrid MPPT algorithm fort he LLC resonant converter in PV power applications”, IEEE Transactions on Power Electronics, 37(1): 944-654, (2022).
• [19] Yılmaz Ü. and Kırçay A., “Installation, modeling and analysis of LLC resonance converter for battery charger in electric vehicle”, Gazi Journal of Engineering Sciences, 7(3): 298-308, (2021).http://www.solec.org/wp-content/uploads/2014/02/SOLKOTEbrochure.pdf