Research on Design Method for Transfer Function of DC/DC Converter System Based on Frequency Domain Method

doi:10.16182/j.issn1004731x.joss.20-0725

Abstract

Abstract:

The small-signal model of a DC/DC converter is usually built by the analytic method, and its accuracy is verified by the frequency domain method. A new idea is developed to model the small signal of the converter, i.e., directly using the frequency domain method.The design process is as follows: The principle and modeling mechanism of the frequency domain method are analyzed, and the realization flow of Matlab modeling is introduced. A typical phase-shifted full-bridge converter is taken as the design object, and a simulation model is built by Simulink. The transfer function is obtained on the basis of the frequency domain method and state-space averaging method (analytic method) separately, and PID Tuner is employed to design the control parameters.The Bode plot and output voltage of the two methods are compared. The results show that the Bode plotmodeled by the frequency domain method is more accurate, and the dynamic performance of its output voltage is better.

Key words: small-signal modeling, frequency domain method, Matlab, phase-shifted full-bridge converter, PID Tuner

CLC Number:

TP391.9

Song Gao, Xue Yin, Jiantao Xu, Yuhao Miao. Research on Design Method for Transfer Function of DC/DC Converter System Based on Frequency Domain Method[J]. Journal of System Simulation, 2022, 34(2): 334-341.

Figures/Tables 11

Table 1

Fig. 1

Fig. 2

Fig. 3

Fig. 4

Fig. 5

Fig. 6

Fig. 7

Fig. 8

Fig. 9

Table 2

Dynamic performance indexes ofoutput voltage

电压

上升时间（t_r1，t_r2）/μs

调节时间

（t_s₁，t_s₂）/μs

超调量

（ $σ 1$ ， $σ 2$ ）/%

Vg1

334

15.5

Vg2

341

Table 2

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对比类型	状态空间平均法	开关网络平均模型法	时间平均等效电路法
优点	物理概念清晰、模型简单	灵活简单、保留信息多	物理意义明确
缺点	纯粹基于数学、计算推导过程繁琐	需预知开关变换器的直流稳态特性	适用范围局限
应用场景	小信号分析	稳态分析、暂态分析	DC稳态分析、AC小信号分析

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