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http://dx.doi.org/10.7471/ikeee.2018.22.4.985

A Study on Steady State Characteristics of LLC Resonant Half Bridge Converter Considering Internal Losses  

Ahn, Tae-Young (Department of Applied Electronic Engineering, Cheongju University)
Publication Information
Journal of IKEEE / v.22, no.4, 2018 , pp. 985-991 More about this Journal
Abstract
In this paper, an equivalent circuit reflecting the internal loss of the LLC resonant half bridge converter was proposed and a steady state characteristic equation including the loss factors was derived. Using the results, the frequency characteristics of I/O voltage gain and input impedance were compared with the lossless model In order to verify the proposed model and the derived equation, the main components of the 1kW class LLC resonant half bridge converter were selected under the same conditions and the steady state characteristics such as voltage gain and input impedance were compared. In particular, to compare more closely the steady state error of the two models, we observed the change in switching frequency with respect to the load current, which is considered to be the most important in the actual circuit design stage. As a result, it is confirmed that the error of the operating frequency is significantly improved from the proposed model and the analysis result.
Keywords
Active snubber; Quasi resonant switching; Valley switching; Flyback converter; AC adaptor;
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1 R. Beiranvand, B. Rashidian, M. Zolghadri and S. M. H. Alavi, "A Design Procedure for Optimizing the LLC Resonant Converter as a Wide Output Range Voltage Source," in IEEE Transactions on Power Electronics, vol.27, no.8, pp.3749-3763, 2012. DOI:10.1109/TPEL.2012.2187801   DOI
2 R. Zheng, B. Liu and S. Duan, "Analysis and Parameter Optimization of Start-Up Process for LLC Resonant Converter," in IEEE Transactions on Power Electronics, vol.30, no.12, pp.7113-7122, 2015. DOI:10.1109/TPEL.2015.2389116   DOI
3 I. Lee and G. Moon, "The k-Q Analysis for an LLC Series Resonant Converter," in IEEE Transactions on Power Electronics, vol.29, no.1, pp.13-16, 2014. DOI:10.1109/TPEL.2013.2255106   DOI
4 X. Tan and X. Ruan, "Equivalence Relations of Resonant Tanks A New Perspective for Selection and Design of Resonant Converters," in IEEE Transactions on Industrial Electronics vol. 63, no.4, pp.2111-2123, 2016. DOI:10.1109/TIE.2015.2506151   DOI
5 Z. Hu, L. Wng, H. Wang, Y. F. Liu and P. C. Sen, "An Accurate Design Algorithm for LLC Resonant converter-Part1," in IEEE Transactions on Power Electronics, vol.31, no.8, pp.5435-5447, 2016.   DOI
6 X. Fang, H. Hu, F. Chen, U. Somani, J. Shen and I. Batarseh, "Efficiency-Oriented Optimal Design of the LLC Resonant Converter Based on Peak Gain Placement," in IEEE Transactions on Power Electronics, vol.28, no.5, pp.2285-2296, 2013. DOI:10.1109/TPEL.2012.2211895   DOI
7 Z. Hu, L. Wng, H. Wang, Y. F. Liu and P. C. Sen, "An Accurate Design Algorithm for LLC Resonant converter-Part2," in IEEE Transactions on Power Electronics, vol.31, no.8, pp.5448-5460, 2016. DOI:10.1109/TPEL.2015.2496179   DOI
8 R. Beiranvand, M. Zolghadri, B. Rashidian and S. M. H. Alavi, "Optimizing the LLC-LC Resonant Converter Topology for Wide Output Voltage and Wide Output Load Applications," in IEEE Transactions on Power Electronics, vol.26, no.11, pp.3192-3204, 2011. DOI:10.1109/TPEL.2011.2143429   DOI
9 Z. Fang, T. Cai, S. Duan and C. Chen, "Optimal Design Methodology for LLC Resonant Converter in Battery Charging Applications Based on Time-Weighted Average Efficiency," in IEEE Transactions on Power Electronics, vol.30, no.10, pp.5469-5483, 2015. DOI:10.1109/TPEL.2014.2379278   DOI