考虑寄生电容的半桥LLC谐振变换器参数优化设计
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摘要
含变压器的隔离型变换器易受到寄生电容的影响,降低系统运行的稳定性。针对LLC谐振变换器,建立含变压器寄生参数的等效电路模型,推导电压增益公式。对比无寄生参数和含寄生参数的电压增益曲线,分析寄生电容对选取电感比及其品质因数所产生的影响。在设计参数时考虑寄生电容的影响,分析开关管实现ZVS的条件,推导电感比的计算方法以及品质因数的取值范围。优化设计电感比、品质因数,进而优化各谐振参数。搭建实验样机,验证该优化方法的正确性和可行性。
An isolation-type converter with a transformer is prone to be affected by parasitic capacitance, thus reducing the stability of system operation. In this paper, an equivalent circuit model containing transformer parasitic parameters is set up for an LLC resonant converter, and the formula for voltage gain is derived. From the comparison of voltage gain curve with and without parasitic parameters, the influence of parasitic inductance on the selection of inductance ratio and quality factor is analyzed. The effect of parasitic capacitance is considered in the design of parameters, the condition of realizing ZVS for a switching tube is analyzed, and the calculation method for inductance ratio and the range of quality factor are derived. The inductance ratio and quality factor are optimized, thus optimizing various resonance parameters. An experimental prototype was set up, which verified the correctness and feasibility of the optimization method.
An isolation-type converter with a transformer is prone to be affected by parasitic capacitance, thus reducing the stability of system operation. In this paper, an equivalent circuit model containing transformer parasitic parameters is set up for an LLC resonant converter, and the formula for voltage gain is derived. From the comparison of voltage gain curve with and without parasitic parameters, the influence of parasitic inductance on the selection of inductance ratio and quality factor is analyzed. The effect of parasitic capacitance is considered in the design of parameters, the condition of realizing ZVS for a switching tube is analyzed, and the calculation method for inductance ratio and the range of quality factor are derived. The inductance ratio and quality factor are optimized, thus optimizing various resonance parameters. An experimental prototype was set up, which verified the correctness and feasibility of the optimization method.
引文
[1] Gtoot H D, Janssen E, Pagano R, et al. Design of a 1-MHz LLC resonant converter based on a DSP-driven SOI halfbridge power MOS module[J]. IEEE Transactions on Power Electronics, 2007, 22(6):2307-2320.
[2]钟运平,程小华,张勇,等.半桥LLC谐振变换器参数优化设计[J].磁性材料及器件, 2014, 3(2):53-57.Zhong Yunping, Cheng Xiaohua, Zhang Yong, et al. Optimal design of parameters of half-bridge LLC resonant converter[J]. Journal of Magnetic Materials and Devices, 2014,3(2):53-57(in Chinese).
[3]王镇道,赵亚魁,章兢,等. LLC半桥式谐振变换器参数模型与设计[J].电工技术学报, 2012, 27(12):51-55.Wang Zhendao, Zhao Yakui, Zhang Jing, et al. Parameter model and design of LLC resonant half-bridge converter[J].Transactions of China Electrotechnical Society, 2012, 27(12):51-55(in Chinese).
[4]赵敏杰,戴瑶,张怀武. LLC谐振变换器的参数设计[J].磁性材料及器件, 2011, 43(2):53-72.Zhao Minjie, Dai Yao, Zhang Huawu. Design of the parameters in LLC resonant converter[J]. Journal of Magnetic Materials and Devices, 2011, 43(2):53-72(in Chinese).
[5]刘大庆,师宇杰.主回路电流有效值最小的LLC参数优化设计[J].电源学报, 2011, 9(1):47-50.Liu Daqing, Shi Yujie. Optimal design method of minimum current RMS for LLC resonant converter[J]. Journal of Power Supply, 2011, 9(1):47-50(in Chinese).
[6]鲁艳,李建兵,江桦,等.考虑寄生参数的LLC谐振倍压变换器优化设计[J].电源学报, 2016, 14(3):69-74.Lu Yan, Li Jianbing, Jiang Hua,et al. Optimal design of parameter in LLC voltage-multiplying resonant converter considering parasitic parameters[J]. Journal of Power Supply, 2016, 14(3):69-74(in Chinese).
[7]余昌斌. LLC谐振半桥DC-DC变换器的研究[D].重庆:重庆大学, 2007.Yu Changbin. Research on LLC resonant half-bridge DCDC converter[D]. Chongqing:Chongqing University, 2007(in Chinese).
[8]胡海兵,王万宝,孙文进,等. LLC谐振变换器效率优化设计[J].中国电机工程学报, 2013, 33(18):48-56.Hu Haibin, Wang Wanbao, Sun Wenjin, et al. Optimal efficiency design of LLC resonant converters[J]. Proceedings of the CSEE, 2013, 33(18):48-56(in Chinese).
[9]陈启超,王建赜,纪延超.双向LLC谐振型直流变压器的软启动及功率换向控制[J].电工技术学报, 2014, 29(8):180-186.Chen Qichao, Wang Jianze, Ji Yanchao. Control scheme of bidirectional LLC resonant DC-DC transformer for soft start and power conversion[J]. Transactions of China Electrotechnical Society, 2014, 29(8):180-186(in Chinese).
[10]陈启超,纪延超,王建赜.双向CLLLC谐振型直流变压器的分析与设计[J].中国电机工程学报, 2014, 34(18):2898-2905.Chen Qichao, Ji Yanchao, Wang Jianze. Analyzing and design of bidirectional CLLLC resonant DC-DC transformer[J]. Proceedings of the CSEE, 2014, 34(18):2898-2905(in Chinese).
[11] Cho S H, Kim C S, Han S K. High-effciency and low-cost tightly regulated dual-output LLC resonant converter[C].2010 IEEE International Sym posium on Industrial Electronics. 2010:862-869.
[2]钟运平,程小华,张勇,等.半桥LLC谐振变换器参数优化设计[J].磁性材料及器件, 2014, 3(2):53-57.Zhong Yunping, Cheng Xiaohua, Zhang Yong, et al. Optimal design of parameters of half-bridge LLC resonant converter[J]. Journal of Magnetic Materials and Devices, 2014,3(2):53-57(in Chinese).
[3]王镇道,赵亚魁,章兢,等. LLC半桥式谐振变换器参数模型与设计[J].电工技术学报, 2012, 27(12):51-55.Wang Zhendao, Zhao Yakui, Zhang Jing, et al. Parameter model and design of LLC resonant half-bridge converter[J].Transactions of China Electrotechnical Society, 2012, 27(12):51-55(in Chinese).
[4]赵敏杰,戴瑶,张怀武. LLC谐振变换器的参数设计[J].磁性材料及器件, 2011, 43(2):53-72.Zhao Minjie, Dai Yao, Zhang Huawu. Design of the parameters in LLC resonant converter[J]. Journal of Magnetic Materials and Devices, 2011, 43(2):53-72(in Chinese).
[5]刘大庆,师宇杰.主回路电流有效值最小的LLC参数优化设计[J].电源学报, 2011, 9(1):47-50.Liu Daqing, Shi Yujie. Optimal design method of minimum current RMS for LLC resonant converter[J]. Journal of Power Supply, 2011, 9(1):47-50(in Chinese).
[6]鲁艳,李建兵,江桦,等.考虑寄生参数的LLC谐振倍压变换器优化设计[J].电源学报, 2016, 14(3):69-74.Lu Yan, Li Jianbing, Jiang Hua,et al. Optimal design of parameter in LLC voltage-multiplying resonant converter considering parasitic parameters[J]. Journal of Power Supply, 2016, 14(3):69-74(in Chinese).
[7]余昌斌. LLC谐振半桥DC-DC变换器的研究[D].重庆:重庆大学, 2007.Yu Changbin. Research on LLC resonant half-bridge DCDC converter[D]. Chongqing:Chongqing University, 2007(in Chinese).
[8]胡海兵,王万宝,孙文进,等. LLC谐振变换器效率优化设计[J].中国电机工程学报, 2013, 33(18):48-56.Hu Haibin, Wang Wanbao, Sun Wenjin, et al. Optimal efficiency design of LLC resonant converters[J]. Proceedings of the CSEE, 2013, 33(18):48-56(in Chinese).
[9]陈启超,王建赜,纪延超.双向LLC谐振型直流变压器的软启动及功率换向控制[J].电工技术学报, 2014, 29(8):180-186.Chen Qichao, Wang Jianze, Ji Yanchao. Control scheme of bidirectional LLC resonant DC-DC transformer for soft start and power conversion[J]. Transactions of China Electrotechnical Society, 2014, 29(8):180-186(in Chinese).
[10]陈启超,纪延超,王建赜.双向CLLLC谐振型直流变压器的分析与设计[J].中国电机工程学报, 2014, 34(18):2898-2905.Chen Qichao, Ji Yanchao, Wang Jianze. Analyzing and design of bidirectional CLLLC resonant DC-DC transformer[J]. Proceedings of the CSEE, 2014, 34(18):2898-2905(in Chinese).
[11] Cho S H, Kim C S, Han S K. High-effciency and low-cost tightly regulated dual-output LLC resonant converter[C].2010 IEEE International Sym posium on Industrial Electronics. 2010:862-869.