Abstract：Aiming at the problems of low excitation energy utilization rate, complicated circuit composition or large control difficulty of the existing forward converter magnetic reset circuit, a forward converter topology with a secondary side parallel LCD is proposed. The working principle and energy transmission mechanism of the proposed forward converter are analyzed in depth, and it is pointed out that the forward converter with LCD can transmit forward energy and excitation energy at the same time, and the excitation inductance during the flyback can work in continuous conduction mode (CCM), It can also work in discontinuous conduction mode (DCM), that is, the proposed forward converter no longer needs the traditional magnetic reset, and the voltage stress of the switching tube when the magnetizing inductor works in CCM is lower; by analyzing the effect of the auxiliary capacitor on the working mode of the magnetizing inductor, An auxiliary capacitance design method to ensure that the magnetizing inductance of the forward converter is working in CCM is proposed. The examples and experimental results verify the feasibility of the proposed forward converter and the correctness of the theoretical analysis and design method.
刘树林, 刘旭, 彭银乔, 严纪志, 张海亮. 二次侧并联LCD正激变换器的能量传输过程分析及辅助电容设计[J]. 电工技术学报, 2022, 37(zk1): 207-216.
Liu Shulin, Liu Xu, Peng Yinqiao, Yan Jizhi, Zhang Hailiang. Analysis of Energy Transmission Process and Design of Auxiliary Capacitor for Secondary Side Parallel LCD Forward Converter. Transactions of China Electrotechnical Society, 2022, 37(zk1): 207-216.
[1] 李龙春, 嵇保健, 洪峰, 等. 1500V三电平正激变换器[J]. 电工技术学报, 2018, 33(9): 2044-2054. Li Longchun, Ji Baojian, Hong Feng, et al.1500V three-level forward converter[J]. Transactions of China Electrotechnical Society, 2018, 33(9): 2044-2054. [2] 刘树林, 刘健. 开关变换器分析与设计[M]. 北京: 机械工业出版社, 2010. [3] Gruner V, Horn T P, Schmitz L, et al.Forward-based high step-up DC-DC converter with input current sharing and output filter reduction: design, modeling, and control[J]. Journal of Control, Automation and Electrical Systems, 2020, 31(1): 21-30. [4] 李洪珠, 刘歆俣, 李洪璠, 等. 正激变换器磁集成分析与设计准则[J]. 中国电机工程学报, 2019, 39(12): 3667-3676. Li Hongzhu, Liu Xinyu, Li Hongfan, et al.Analysis and design criteria of integrated magnetics in forward converter[J]. Proceedings of the CSEE, 2019, 39(12): 3667-3676. [5] 陈道炼, 陈卫昀, 严仰光. RCD 箝位正激变换器的分析研究[J]. 南京航空航天大学学报, 1997, 29(2): 111-115. Chen Daolian, Chen Weiyun, Yan Yangguang.Analytical study of RCD clamped forward converter[J]. Journal of Nanjing University of Aeronautics & Astronautics, 1997, 29(2): 111-115. [6] 胡海兵, 吴红飞, 刘薇, 等. 一族有源钳位正激变换器[J]. 电工技术学报, 2013, 28(12): 245-250, 261. Hu Haibing, Wu Hongfei, Liu Wei, et al.A family of active clamp forward converters[J]. Transactions of China Electrotechnical Society, 2013, 28(12): 245-250, 261. [7] López del Moral D, Barrado A, Sanz M, et al. Analysis and implementation of the autotransformer forward-flyback converter applied to photovoltaic systems[J]. Solar Energy, 2019, 194: 995-1012. [8] 夏炎冰. 自磁复位正激式变换器研究[D]. 南京: 南京航空航天大学, 2012. [9] 王国礼, 金新民. 采用LCD箝位电路的正激DC-DC变换器[J]. 电工技术杂志, 2000(12): 24-26. Wang Guoli, Jin Xinmin.A forward DC-DC converter with a LCD clamp circuit[J]. Electrotechnical Journal, 2000(12): 24-26. [10] 宁平华, 陈乐柱, 丁鑫龙, 等. 双RCD箝位的双管正激变换器研究[J]. 电源学报, 2016, 14(3): 124-130. Ning Pinghua, Chen Lezhu, Ding Xinlong, et al.Rese-arch on dual switch forward converter with dual RCD clamp[J]. Journal of Power Supply, 2016,14(3): 124-130. [11] 吴琨, 钱挺, 王浩. 一种开关频率固定的输出可调型有源钳位正激双向谐振变换器[J]. 电工技术学报, 2018, 33(20): 4771-4779. Wu Kun, Qian Ting, Wang Hao.A novel fixed switching frequency active-clamp forward dual resonant converter with regulation capability of output voltage[J]. Transactions of China Electrotechnical Society, 2018, 33(20): 4771-4779. [12] 李学峰, 吴德军, 王仕韬. 一种变模态恒定磁芯复位电压双管正激变换器[J]. 电源学报, 2018, 16(1): 19-23. Li Xuefeng, Wu Dejun, Wang Shitao.Flexible mode double-switch forward converter with constant magnetic-reset voltage[J]. Journal of Power Supply, 2018, 16(1): 19-23. [13] Qian Ting, Wu Qichen.A scheme of a resonant forward-flyback converter with suppressed frequency variation[J]. IEEE Transactions on Power Electronics, 2018, 33(5): 3711-3716. [14] 刘树林, 曹剑, 胡传义, 等. 正-反激组合变换器的能量传输模式及输出纹波电压分析[J]. 电工技术学报, 2019, 34(8): 1647-1656. Liu Shulin, Cao Jian, Hu Chuanyi, et al.Energy transmission modes and output ripple voltage of forward-flyback converter[J]. Transactions of China Electrotechnical Society, 2019, 34(8): 1647-1656. [15] Cao Jian, Liu Shulin, Yan Liqian, et al.Research on power transmission characteristic of forward flyback converter[C]//2018 13th IEEE Conference on Industrial Electronics and Applications (ICIEA), Wuhan, 2018: 1342-1346. [16] Liu Shulin, Hu Chuanyi, Cao Jian, et al.Research on the PFC mechanism of forward-flyback converter[C]//The 5th International Conference on Electrical Engineering Control and Robotics (EECR), Guangzhou, 2019: 12039-12047. [17] Eshkevari A L, Mosallanejad A, Sepasian M.Design, modelling, and implementation of a modified double-switch flyback-forward converter for low power applications[J]. IET Power Electronics, 2018, 12(4): 739-748. [18] Jaeil B, Han-Shin Y.Full-bridge active-clamp forward-flyback converter with an integrated transformer for high-performance and low cost low-voltage DC converter of vehicle applications[J]. Energies, 2020, 13(4): 863-880. [19] 黄亚峰, 陈剑, 刘俊峰, 等. 正反激倍压DC-DC变换器机理分析与仿真[J]. 东北电力大学学报, 2018, 38(4): 35-39. Huang Yafeng, Chen Jian, Liu Junfeng, et al.Mechanism analysis and simulation of forward and flyback DC-DC converter[J]. Journal of Northeast Electric Power University, 2018, 38(4): 35-39. [20] 王星星, 嵇保健, 洪峰, 等. 一种改进的正反激并网微型逆变器[J]. 电工技术学报, 2017, 32(18): 202-210. Wang Xingxing, Ji Baojian, Hong Feng, et al.An improved forward-flyback grid-connected micro-inve-rter[J]. Transactions of China Electrotechnical Society, 2017, 32(18): 202-210.
2022, Vol. 37 
