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作 者:霍陆昱 陈怡霖 杜海忠 章治国 HUO Luyu;CHEN Yilin;DU Haizhong;ZHANG Zhiguo(College of Electrical and Electronic Engineering,Chongqing University of Technology,Chongqing 400054;Henan Tiantong Electric Power Co.,Ltd.,Pingdingshan 467000)
机构地区:[1]重庆理工大学电气与电子工程学院,重庆400054 [2]河南天通电力有限公司,平顶山467000
出 处:《电气工程学报》2021年第2期131-140,共10页Journal of Electrical Engineering
摘 要:移相全桥变换器在小体积隔离型降压场合得到了广泛的应用,同时为了减少副边大电流压力,可采用双电感进行倍流整流,组合成移相全桥倍流整流(Phase-shifted full bridge current-doubling synchronous rectifier,PSFB-CDSR)变换器。通过对其进行模态简化,提出一种基于多周期离散迭代模型的PSFB-CDSR变换器稳定性判别方法。和传统的小信号模型相比,文章提出的等效模型能够同时描述变换器的各个电感电流和输出电容电压的动态,具有直观性和准确性;并在此基础上对移相全桥电流环流中的寄生电阻进行假设,精准地刻画该寄生电阻对于功率传输特性的影响;然后考察该模型在离散域中状态方程的特征根变化情况,得到在不同输入输出条件下对稳定裕度的影响。最后,仿真结果表明了该等效电路的精确性以及结论分析的正确性。Phase-shifted full-bridge converters have been widely used in small-volume isolated step-down applications.At the same time,in order to reduce the high-current pressure on the secondary side,dual inductors can be used for current doubling rectification,Shifted full bridge current-doubling synchronous rectifier converter(PSFB-CDSR).By simplifying the modal simplification,an equivalent circuit of a PSFB-CDSR converter based on a multi-cycle discrete iterative model is proposed.Compared with the traditional small signal model,the equivalent circuit model proposed in this paper can simultaneously describe the dynamics of each inductor current and output capacitor voltage of the converter,which is intuitive and accurate;and based on this,make assumptions about the parasitic resistance in the phase-shifted full bridge circulating current,and accurately describe the influence of the parasitic resistance on the power transmission characteristics;then the characteristic root of the state equation of the circuit model in the discrete domain is changed to obtain the stability margin under different input and output conditions influences.Finally,simulation results show the accuracy of the equivalent circuit and the correctness of the conclusion analysis.
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