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| A Self-Oscillating LLC Resonant Converter |
| Su Shaokan1, Ruan Xinbo1, Ye Zhihong2 |
| 1. Nanjing University of Aeronautics and Astronautics Nanjing 210016 China 2. Lite-On Technology Corp. Nanjing 210019 China |
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Abstract The LLC resonant converter can realize zero-voltage-switching for the switches and zero-current-switching for the rectifier diodes over the full load range, thus a high efficiency is achieved. The output voltage is independent of the load when LLC resonant converter operates at the resonant frequency. Based on this characteristic, this paper proposes a self-oscillating drive circuit for LLC resonant converter. The driving signals of the switches are obtained by the current transformer parallel with a inductor, which is used to sense the resonant inductor current, and the driving circuit is improved to speed up switching. For restraining the current overshoot during the start up period, an improved LLC resonant converter topology is used. The self-oscillating LLC resonant converter has the advantages of reduced cost and size compared with the converter with specific control chip, and it is suitable for the applications where the regulation of the output voltage is not strictly required.
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Received: 25 February 2010
Published: 10 March 2014
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[1] 阮新波, 严仰光．直流开关电源的软开关技术[M].北京：科学出版社, 2003．
[2] 长谷川彰, 何希才. 开关稳压电源的设计与应用[M].北京：科学出版社, 2006．
[3] Lee F C, Wilson T G, Feng Y M．Analysis of limit cycles in a two-transistor saturable-core parallel inverter[J]. IEEE Transactions on Aerospace Electronics System, 1973, 9(4): 571-584．
[4] Lee F C, Wilson T G. Modeling and analysis of several classes of self oscillating inverters: part II — state plane representations[J]. IEEE Transactions on Circuits and Systems, 1982, 29(6): 355-365．
[5] Jensen J L. An improved square-wave oscillator circuit[J]. IRE Transactions on Circuit Theory, 1957: 276-279.
[6] Ferreira J A, Van Wyk J D. On overcoming the main disadvantages of the self-oscillating Royer inverter[C]. Proceedings of the IEE International Conference on Power Electronics and Variable Speed Drives, 1984: 123-126．
[7] Theron P C, Swanepoel P H, Schoeman J J, et al. Soft switching self-oscillating FET-based DC/DC converter[C]. Proceedings of the IEEE Power Electronics Specialists Conference, 2003: 641-648．
[8] Sakmoto H, Harada H, Kang C H, et al. A self oscillated half bridge converter using impulse resonant soft-switching[C]. Proceedings of International Telecommunications Energy Conference, 2002: 227-231．
[9] Irving B T, Jovanović M M. Analysis and design of self-oscillating flyback converter[C]. Proceedings of IEEE Applied Power Electronics Conference, 2002: 897-903.
[10] Irving B T, Panov Y, Jovanović M M. Small-signal model of variable-frequency flyback converter[C]. Proceedings of IEEE Applied Power Electronics Conference, 2003: 977-982．
[11] Lempinen J, Suntio T. Modeling and analysis of a self-oscillating peak-current controlled flyback converter[C]. Proceedings of IEEE Annual Conference of the Industrial Electronics Society, 2001: 960-965.
[12] 黎平. LED驱动电源研究[D]. 重庆：重庆大学, 2007.
[13] Yang B. Topology investigation for front end dc/dc power conversion for distributed power system[D]. Blacksburg: Virginia Polytechnic Institute and State University, 2003．
[14] Lu B. Investigation of high-density integrated solution for AC/DC conversion of a distributed power system[D]. Blacksburg: Virginia Polytechnic Institute and State University, 2006．
[15] Liu Y. High efficiency optimization of LLC resonant converter for wide load range[D]. Blacksburg: Virginia Polytechnic Institute and State University, 2008．
[16] 陆治国, 余昌斌. 基于HFA的LLC变换器稳态分析[J]．低压电器, 2007 (17): 9-16．
Lu Zhiguo, Yu Changbin. Steady state analysis of LLC resonant converters based on FHA[J]. Low Voltage Apparatus, 2007 (17): 9-16. |
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2011, Vol. 26 
