Five-level LLC resonant converter with mix-modulation method

被引：0
|
作者：
Yuan Y.-S. [1 ,2 ]
Mei X.-L. [1 ]
Zhang W.-X. [2 ]
Wen W. [2 ]
Li H. [2 ]
机构：
[1] School of Electrical and Automation Engineering, East China Jiaotong University, Nanchang
[2] State Key Laboratory of Heavy Duty AC Drive Electric Locomotive Systems, Zhuzhou
来源：
Yuan, Yi-Sheng | 1600年 / Editorial Department of Electric Machines and Control卷 / 24期
关键词：
Converter; Five-level; High voltage gain; LLC resonance; Modulation; Wide range;
D O I：
10.15938/j.emc.2020.06.013
中图分类号：
学科分类号：
摘要：
In order to widen the voltage gain of LLC resonant converter, a five-level LLC resonant converter is proposed, which is composed of two three-level(TL) bridge arms, main/auxiliary transformers, resonant elements and a set of rectifier bridges. The DC side and AC side of the two TL bridge arms are in parallel connection and serial connection respectively. The two TL bridge arms operate in frequency modulation or phase shifting mode. The low, medium and high voltage gain modes can be obtained according to output voltage requirements. In the low voltage gain mode, only the main arm circuit operates under the pulse frequency modulation (PFM) mode. In the medium voltage gain mode, the main arm works in the fixed frequency mode, while the auxiliary arm operates in the fixed frequency + phase shifting mode. In the high voltage gain mode, the main and auxiliary arms work in the PFM mode at the same time. Compared with the traditional TL LLC resonant converter, the new circuit has lower circuit switching frequency at low voltage output. Using the same resonant parameters, it has a higher voltage gain and is more suitable for wide output range. Moreover, the operation principle of the proposed converter was clarified, and compared with the traditional topology. A prototype with 90~220 V output was built. The experimental data show that the efficiency of the new topology is 1.9% higher than that of the traditional topology in wide range under the low voltage gain mode, verifying the correctness of the theoretical analysis. © 2020, Harbin University of Science and Technology Publication. All right reserved.
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页码：107 / 118
页数：11
相关论文
共 25 条
  • [1] YANG Guanghao, JI Baojian, HONG Feng, Et al., An interleaved three-level forward converter with variable turns ratio, Proceedings of the CSEE, 37, 12, (2017)
  • [2] LIN Borren, DENG Jiayu, ZVS resonant converter with parallel-series transformer connection, IEEE Transactions on Industrial Electronics, 58, 7, (2011)
  • [3] LIN Borren, CHEN P L, HUANG C L., Analysis of LLC converter with series-parallel connection, 2010 5th IEEE Conference on Industrial Electronics and Applications, pp. 346-351, (2010)
  • [4] CHEN Hui, WU Xinke, HU Chen, Et al., A hybrid ZVS full-bridge converter with transformer winding series-parallel auto regulated current doubler rectifier, 2012 IEEE Energy Conversion Congress and Exposition (ECCE), pp. 2209-2214, (2012)
  • [5] WU Xinke, CHEN Hui, ZHANG Junming, Interleaved phase-shift full-bridge converter with transformer winding series-parallel auto-regulated (SPAR) current doubler rectifier, IEEE Transactions on Power Electronics, 30, 9, (2015)
  • [6] CHEN Hui, WU Xinke, PENG Fangzheng, A hybrid ZVZCS phase-shift full-bridge converter with series/parallel auto-regulated transformer windings, 2012 Twenty-Seventh Annual IEEE Applied Power Electronics Conference and Exposition (APEC), pp. 329-334, (2012)
  • [7] OUYANG Ziwei, MICHAEL A E., Wide input range power converters using a variable turns ratio transformer, 2016 IEEE Applied Power Electronics Conference and Exposition (APEC), pp. 2473-2478, (2016)
  • [8] YONG Shi, XU Yang, Zero-voltage switching PWM three-level full-bridge DC-DC converter with wide ZVS load range, IEEE Transactions on Power Electronics, 28, 10, (2013)
  • [9] LIU Fuxin, YAN Jiajia, RUAN Xinbo, Zero-voltage and zero-current-switching PWM combined three-level DC/DC converter, IEEE Transactions on Industrial Electronics, 57, 5, (2010)
  • [10] JIN Feng, LIU Fuxin, RUAN Xinbo, Multi-phase multi-level LLC resonant converter with modular structure, Proceedings of the CSEE, 35, 17, (2015)
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