带耦合电感的DC-DC SEPIC变换器建模与分析

Onur Kircioglu, Murat Unlu, S. Çamur
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引用次数: 35

摘要

目前,DC/DC变换器广泛应用于工业应用和可再生能源系统中。SEPIC(单端初级电感转换器)DC-DC转换器能够在升压或降压模式下工作,通常用于电池充电器系统。本文对具有耦合和不耦合电感的SEPIC进行了建模和分析。本文在MATLAB/Simulink环境下建立了状态空间平均(SSA)模型。对得到的SEPIC模型在不同输入参数下进行了仿真,并对耦合和不耦合的结果进行了比较。利用小信号模型对电感耦合和非耦合SEPIC的SSA模型进行线性化处理,得到控制占空比对输出电压的传递函数。构造了占空比到输出电压传递函数的波德图,其结果可用于各种应用中设计闭环控制器来调节输出电压。
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Modeling and analysis of DC-DC SEPIC converter with coupled inductors
Nowadays, DC/DC converters are widely used in industrial applications and renewable energy systems. A SEPIC (single-ended primary inductance converter) DC-DC converter is capable of operating in either step-up or step-down mode and commonly used in a battery charger system. This paper presents the modeling and analyzing of the SEPIC with coupled and uncoupled inductors. In this study, the state-space averaged (SSA) model is established and built in MATLAB/Simulink environment. The obtained SEPIC model was simulated for different input parameters, and results of coupled and uncoupled are compared. Moreover, the small signal model is used for linearization of the SSA model of the SEPIC with coupled and uncoupled inductors, hence the transfer function of control (duty cycle) to output voltage is formulated. Bode plots of the duty cycle to output voltage transfer functions are constructed, and the result can be used in various applications to design a closed-loop controller to regulate the output voltage.
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