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

doi:10.11985/2021.02.017

Abstract

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

CLC Number:

TM561

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.

Figures/Tables 14

References 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