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http://dx.doi.org/10.6113/JPE.2019.19.4.934

Current Sharing Method Based on Optimal Phase Shift Control for Interleaved Three-Phase Half Bridge LLC Converter with Floating Y-Connection  

Shi, Lin (State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology)
Liu, Bangyin (State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology)
Duan, Shanxu (State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology)
Publication Information
Journal of Power Electronics / v.19, no.4, 2019 , pp. 934-943 More about this Journal
Abstract
A current balance problem exists in multi-phase LLC converters due to the resonant parameter tolerance. This paper presents a current balancing method for interleaved three-phase half bridge LLC converters. This method regulates the phase shift angle of the driving signals between the three phases based on a converter with a floating Y-connection. The floating midpoint voltage has different influences on each phase current and makes the three-phase current balance performance better than midpoint non-floating systems. Phase shift control between modules can further regulate the midpoint voltage. Then three phase current sharing is realized without adding extra components. The current distributions in a midpoint non-floating system and a midpoint floating system are compared. Then the principle and implementation of the proposed control strategy are analyzed in detail. A 3kW prototype is built to verify the validity and feasibility of the proposed method.
Keywords
Current sharing; Interleaved LLC converter; Phase shift control; Three-phase LLC converter; Y-connection;
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1 B. Yang, F. C. Lee, A. J. Zhang, and G. Huang, "LLC resonant converter for front end DC/DC conversion," in Proc. 17th Annu. IEEE Appl. Power Electron. Conf. Expo. (APEC), pp. 1108-1112, 2002.
2 B. Lu, W. Liu, Y. Liang, F. C. Lee, and J. D. van Wyk, "Optimal design methodology for LLC resonant converter," in Proc. IEEE. Appl. Power Electron. Conf., pp. 533-538, 2006.
3 J. Y. Lee, Y. S. Jeong, and B. M. Han, “An isolated DC/DC converter using high-frequency unregulated llc resonant converter for fuel cell applications,” IEEE Trans. Ind. Electron., Vol. 58, No. 7, pp. 2926-2934, Jul. 2011.   DOI
4 M. Kim, "Two-phase interleaved LLC resonant converter with phase shedding control," in Proc. Int. Power Electron. Conf., pp. 164-1645, 2010.
5 B.-R. Lin, W.-R. Yang, J.-J. Chen, C.-L. Huang, and M.-H. Yu, "Interleaved LLC series converter with output voltage doubler," in Proc. Int. Power Electron. Conf., pp. 92-98, 2010.
6 J. Deng, S. Li, S. Hu, C. C. Mi, and R. Ma, “Design methodology of LLC resonant converters for electric vehicle battery chargers,” IEEE Trans. Veh. Technol., Vol. 63, No. 4, pp. 1581-1592, Apr. 2014.   DOI
7 J.-E. Yeon, W.-S. Kang, K.-M. Cho, T.-Y. Ahn, and H.-J. Kim, "Multiphase interleaved LLC-SRC and its digital control scheme," in Proc. Int. Symp. Power Electron. Elect. Drives Autom. Motion, pp. 1189-1193, 2010.
8 B. C. Kim, K. B. Park, C. E. Kim, and G. W. Moon, "Load sharing characteristic of two-phase interleaved LLC resonant converter with parallel and series input structure," in Proc. IEEE ECCE, pp. 750-753, 2009.
9 H. Figge, T. Grote, F. Schafmeister, N. Frohleke, and J. Bocker, "Two- phase interleaving configuration of the LLC resonant converter - Analysis and experimental evaluation," in Proc. Ann. Conf. IEEE. Ind. Electron. Soc., pp. 1392-1397, 2013.
10 W. Martinez, M. Noah, S. Endo, K. Nanamori, S. Kimura, Y. Itoh, M. Yamamoto, J. Imaoka, and K. Umetani, "Three-phase LLC resonant converter with intergrateics," in Proc. IEEE ECCE, pp. 1-8, 2016.
11 H. S. Kim, J. W. Baek, M. H. Ryu, J. H. Kim, and J. H. Jung, “The high-efficiency isolated ac-dc converter using the three-phase interleaved LLC resonant converter employing the Y-connected rectifier,” IEEE Trans. Power Electron., Vol. 29, No. 8, pp. 4017-4028, Aug. 2014.   DOI
12 F. Jin, F. Liu, X. Ruan, and X. Meng, "Multi-phase multi-level LLC resonant converter with low voltage stress on the primary-side switches," in Proc. IEEE Energy Convers. Congr. Expo., pp. 4704-4710, 2014.
13 Y. Nakakohara, H. Otake, T. M. Evans, T. Yoshida, M. Tsuruya, and K. Nakahara, “Three-phase LLC series resonant DC/DC converter using SiC MOSFETs to realize high-voltage and high-frequency operation,” IEEE Trans. Ind. Electron., Vol. 63, No. 4, pp. 2103-2110, Apr. 2016.   DOI
14 O. Kirshenboim and M. M. Peretz, "Combined multi-level and two-phase interleaved LLC converter with enhanced power processing characteristics and natural current sharing," IEEE Trans. Power Electron., Vol. 33, no. 7, pp. 5613-5620, Jul. 2017.   DOI
15 E. Orietti, P. Mattavelli, G. Spiazzi, C. Adragna, and G. Gattavari, "Two phase interleaved LLC resonant converter with current-controlled inductor," in Proc. IEEE Brazilian Power Electron. Conf., pp. 289-304, 2009.
16 Z. Hu, Y. Qiu, and Y.-F. Liu, "A control strategy and design method for interleaved LLC converters operating at variable switching frequency," IEEE Trans. Power Electron., vol. 29, no. 8, pp. 4426-4437, Aug. 2014.   DOI
17 C. Liu, X. Xu, D. He, H. Liu, X. Tian, Y. Guo, G. Cai, C. Ma, and G. Mu, “Magnetic-coupling current-balancing cells based input-parallel output-parallel LLC resonant converter modules for high-frequency isolation of dc distribution systems,” IEEE Trans. Power Electron., Vol. 31, No. 10, pp. 6968-6979, Oct. 2016.   DOI
18 B. C. Kim, K. B. Park, C. E. Kim, and G. W. Moon, "Load sharing characteristic of two-phase interleaved LLC resonant converter with parallel and series input structure," in Proc. IEEE Energy Convers. Congr. Expo., pp. 750-753, 2009.
19 H. Wang, Y. Chen, Y. F. Liu, J. Afsharian, and Z. Yang, “A passive current sharing method with common inductor multiphase LLC resonant converter,” IEEE Trans. Power Electron., Vol. 32, No. 9, pp. 6994-7010, Sep. 2017.   DOI
20 F. Duan, M. Xu, X. Yang, and Y. Yao, "Asymmetrical interleaving strategy and AVP concept for interleaved LLC resonant DC/DC," in Proc. IEEE Appl. Power Electron. Conf., pp. 2003-2010, 2014.
21 K. Murata and F. Kurokawa, “An interleaved PFM LLC resonant converter with phase-shift compensation,” IEEE Trans. Power Electron., Vol. 31, No. 3, pp. 2264-2272, Mar. 2016.   DOI
22 H. Wang, Y. Chen, Y. Qiu, P. Fang, Y. Zhang, L. Wang, Y.Liu, J. Afsharian, and Z. Yang, “Common capacitor multiphase LLC converter with passive current sharing ability,” IEEE Trans. Power Electron., Vol. 33, No. 1, pp. 370-387, Jan. 2018.   DOI
23 M. Sato, R. Takiguchi, J. Imaoka, and M. Shoyama, "A novel secondary PWM-controlled interleaved LLC resonant converter for load current sharing," in Proc. IEEE Int. Power Electron. Conf., pp. 2276-2280, 2016.
24 H. Wu, X. Zhan, and Y. Xing, “Interleaved LLC resonant converter with hybrid rectifier and variable-frequency plus phase-shift control for wide output voltage range applications,” IEEE Trans. Power Electron., Vol. 32, No. 6, pp. 4246-4257, Jun. 2017.   DOI
25 E. Orietti, P. Mattavelli, G. Spiazzi, C. Adragna, and G. Gattavari, "Current sharing in three-phase LLC interleaved resonant converter," in Proc. Energy Convers. Congr. Expo., pp. 1145-1152, 2009.