基于多周期离散迭代模型的移相全桥倍流同步整流变换器及其稳定性分析

doi:10.11985/2021.02.017

电气工程学报 ›› 2021, Vol. 16 ›› Issue (2): 131-140.doi: 10.11985/2021.02.017

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基于多周期离散迭代模型的移相全桥倍流同步整流变换器及其稳定性分析

霍陆昱¹(), 陈怡霖²(), 杜海忠¹(), 章治国¹()

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

收稿日期:2020-12-15 修回日期:2021-03-21 出版日期:2021-06-25 发布日期:2021-08-05
通讯作者: 章治国 E-mail:1219051368@qq.com;924427205@qq.com;838872578@qq.com;zzg@cqut.edu.com
作者简介:章治国,男,1977年生,博士,教授。主要研究方向为电力电子拓扑与控制、微电网及其装备技术。E-mail： zzg@cqut.edu.com
霍陆昱,男,1993年生,硕士研究生。主要研究方向为电力电子拓扑及其控制技术。E-mail： 1219051368@qq.com
陈怡霖,女,1995年生。主要研究方向为电力电子拓扑设计。E-mail： 924427205@qq.com
杜海忠,男,1995年生,硕士研究生。主要研究方向为电力电子拓扑及其控制技术。E-mail： 838872578@qq.com

Phase-shifted Full-bridge Current-doubling Synchronous Rectifier Converter and Its Stability Analysis on Multi-cycle Discrete Iterative Model

HUO Luyu¹(), CHEN Yilin²(), DU Haizhong¹(), ZHANG Zhiguo¹()

1. College of Electrical and Electronic Engineering, Chongqing University of Technology, Chongqing 400054
2. Henan Tiantong Electric Power Co., Ltd., Pingdingshan 467000

Received:2020-12-15 Revised:2021-03-21 Online:2021-06-25 Published:2021-08-05
Contact: ZHANG Zhiguo E-mail:1219051368@qq.com;924427205@qq.com;838872578@qq.com;zzg@cqut.edu.com

摘要/Abstract

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。

关键词: 移相全桥, 倍流整流, 离散迭代模型, 特征根, 稳定裕度

Abstract:

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.

Key words: Phase-shifted full bridge, current doubling rectification, discrete iterative model, characteristic root, stability margin

中图分类号:

TM561

霍陆昱, 陈怡霖, 杜海忠, 章治国. 基于多周期离散迭代模型的移相全桥倍流同步整流变换器及其稳定性分析[J]. 电气工程学报, 2021, 16(2): 131-140.

HUO Luyu, CHEN Yilin, DU Haizhong, ZHANG Zhiguo. Phase-shifted Full-bridge Current-doubling Synchronous Rectifier Converter and Its Stability Analysis on Multi-cycle Discrete Iterative Model[J]. Journal of Electrical Engineering, 2021, 16(2): 131-140.

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参考文献 22

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参数	数值	参数	数值
输入电压v_i/V	48	全桥管输出电容C_oss/pF	630
滤波电感L₁/μH	12	变压器变比N	1
滤波电感L₂/μH	12	开关频率f/kHz	100
谐振电感L_r/μH	1	移相桥占空比D	0.48
输出滤波电容量C_o/μF	400	移相桥桥臂死区D_death	0.02

参数			数值
输入电压v_i/V	48	72	96	120	144
比例参数k_p/min	0.414	0.276	0.208	0.166	0.138

基于多周期离散迭代模型的移相全桥倍流同步整流变换器及其稳定性分析

Phase-shifted Full-bridge Current-doubling Synchronous Rectifier Converter and Its Stability Analysis on Multi-cycle Discrete Iterative Model

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