Abstract：A high-frequency soft switch power supply prototype was developed, which was technically designed to provide power source for magnetron in variable-frequence microwave oven. A LLC resonant converter whose output end combined with a voltage doubling rectifying circuit was used as its main circuit topology. The main circuit’ steady-state equivalent circuit model was established based on first harmonic analysis method. By means of the model the circuit’ DC gain, resonant current and zero-voltage-switching (ZVS) condition were theoretically analyzed, and the converter’ key parameters such as turns ratio of high frequency transformer, quality factor, excitation inductance, resonant inductance, resonant capacitance were optimized. The simulation result and the experimental verification indicate that the established steady-state equivalent circuit model and its theoretical analysis are correct, and the resonant network parameters’ theoretical analysis and its optimal design are correct. The results have practical significance for analyzing, studying, improving magnetron power supply and guiding its production.
王春芳, 徐勤超. 变频微波炉电源用LLC谐振变换器[J]. 电工技术学报, 2012, 27(6): 103-109.
Wang Chunfang, Xu Qinchao. Study of LLC Resonant Converter for Variable-Frequence Microwave Oven Power Supply. Transactions of China Electrotechnical Society, 2012, 27(6): 103-109.
[1] 顾亦磊, 杭丽君, 吕征宇, 等. 磁放大后级调整技术在LLC谐振型变换器中的应用[J]. 电工技术学报, 2006, 21(9): 93-98. Gu Yilei, Hang Lijun , Lǖ Zhengyu , et al. Application of magamp post regulation in LLC resonant converter[J]. Transactions of China Electrotechnical Society, 2006, 21(9): 93-98. [2] 金科, 阮新波. 复合式全桥三电平LLC谐振变换器[J]. 中国电机工程学报, 2006, 26(3): 53-58. Jin Ke, Ruan Xinbo. Hybrid full bridge three-level LLC resonant converter[J]. Proceedings of the CSEE, 2006, 26(3): 53-58. [3] 马皓, 祁丰. 一种改进的LLC变换器谐振网络参数设计方法[J]. 中国电机工程学报, 2008, 28(33):6-11. Ma Hao, Qi Feng. An improved design method for resonant tank parameters of LLC resonant converter[J]. Proceedings of the CSEE, 2008, 28(33): 6-11. [4] 赵晨, 石洋, 吴新科, 等. 三元件串联LLC谐振变流器的优化设计策略[J]. 电工技术学报, 2008, 23(1): 65-71. Zhao Chen, Shi Yang, Wu Xinke, et al. Optimal design strategy for three components series LLC resonant converter[J]. Transactions of China Electrotechnical Society, 2008, 23(1): 65-71. [5] Fang Yu, Xu Dehong, Zhang Yanjun, et al. Standby mode control circuit design of LLC resonant converter[C]. IEEE Annual Power Electronics Specialists Conference, 2007: 726-730. [6] Hang Lijun, Lu Zhengyu, Qian Zhaoming. Research of digital control strategy for multi-resonant LLC converter[C]. IEEE International Symposium on Industrial Electronics, 2007: 479-484. [7] Lin B R, Chen J J, Yang C Y. Analysis and implementation of dual-output llc resonant converter[C]. Proceedings of the IEEE International Conference on Industrial Technology, 2008. [8] Hsieh Guan Chyn, Tsai Cheng Yuan, Hsieh Shih Hung. Design considerations for LLC series-resonant converter in two-resonant regions[C]. IEEE 38th Annual Power Electronics Specialists Conference, 2007. [9] Jung Jee Hoon, Kwon Joong Gi. Theoretical analysis optimal design of LLC resonant converter[C]. European Conference on Power Electronics and Applications, EPE, 2007. [10] Lu Bing, Liu Wenduo, Liang Yan, et al. Optimal design methodology for LLC resonant converter[C]. IEEE Applied Power Electronics Conference and Exposition, 2006:533-538. [11] Wang Bin, Xiaoni Xin, Wu Stone, et al. Analysis and implementation of LLC burst mode for light load efficiency improvement[C]. IEEE Applied Power Electronics Conference and Exposition, 2009: 58-64. [12] Choi Hangseok. Analysis and design of LLC resonant converter with integrated transformer[C]. IEEE Applied Power Electronics Conference and Exposition, 2007: 1630-1635. [13] 顾亦磊, 吕征宇, 杭丽君, 等. 一种适用于高压输出的软开关多谐振直流变流器[J]. 电工技术学报, 2006, 21(4): 102-106. Gu Yilei, Lü Zhengyu, Hang Lijun, et al. Soft-switching multi-resonant DC-DC converter for high voltage output applications[J]. Transactions of China Electrotechnical Society, 2006, 21(4): 102-106. [14] Pahlevaninezhad Majid, Farzanefard Hossein, Motahari Reza, et al. Analysis and implementation of a LLC resonant converter for magnetron modulator[C]. Proceedings of the IEEE International Conference on Industrial Technology, 2006: 998-1003. [15] 徐勤超, 王春芳, 李从洋. LLC谐振式磁控管供电电源的研究[J]. 电力电子技术, 2010, 44(10): 106-108. Xu Qinchao, Wang Chunfang, Li Congyang. Research on LLC resonant power supply for driving a magnetron[J]. Power Electronics, 2010, 44(10): 106-108. [16] De Simone S, Adragna C, Spini C, et al. Design- oriented steady state analysis of LLC resonant converters based on FHA[C]. International Symposium on Power Electronics, Electrical Drives, Automation and Motion, 2006:200-207. [17] Lazar J F, Martinelli R. Steady-state analysis of the LLC series resonant converter[C]. Conference Proceedings of IEEE Applied Power Electronics Conference and Exposition, 2001: 728-735. [18] Yang Bo, Lee Fred C, Zhang Alpha J, et al. LLC resonant converter for front end DC-DC conversion[C]. IEEE Applied Power Electronics Conference and Exposition, 2002: 1108-1112. [19] Adragna C, De Simone S, Spini C. A design methodology for LLC resonant converters based on inspection of resonant tank currents[C]. IEEE Applied Power Electronics Conference and Exposition, 2008:1361-1367.
2012, Vol. 27 
