MATLAB隔离式开关电源仿真分析
毕业论文关键词： 半桥式 DC/DC 变换； PWM ；开关电源； SG3525
Abstract Abstract Abstract AbstractSwitching power supply is a indispensable part of modern power electronic equipment.The core of it is power electronic switching circuit and it was used widely in the marketbecuase of the characteristics of small, light an defficient. Matlab/Simulink simulatetechnology is an international software concerning the model, simulation and analys i s ofdynamic system. The paper introduced the design, simulation and analysis of the isolationtype half bridge switching power supply based on the Matlab. The whole systemincluding the main circuit which covered the input rectifier filter circuit, half bridgeconverter and the output rectifier filter circuit ； the control circuit that PWM signal isproduced by the chip SG3525 ； the switching power is a half bridge switching circuitwhich input conditions are the voltage of 10 0V, the frequence of 50Hz, and the power of40 W( 40 V, 1A). It owns high frequency, high efficiency, high and stable output voltage.After the introduce of full bridge DC/DC transformation,SG3525 shows the design andresearch of various parameters in the system at the same time , and then usingMatlab/Simulink simulation obtained the the system waveform diagrams which can findreasons of errors with the experimental data analysis. The experiment result shows that thedesign of switching power suppy based on system model is feasible
Keywords: half-bridge DC/DC convert;PWM;Switch power supply;SG3525
目 录
第一章 绪论 - 1
1.1 研究目的及意义 1
1.3 主要研究内容、研究方法及步骤 2
1.3.1 主要研究内容 - 2
1.3.2 研究方法及步骤和措施等 3
1.4 开关电源的介绍 - 3
1.5 本文的主要内容 - 4
第二章 软件及芯片介绍 - 5
2.1 MATLAB 简介 5
2.2 Simulink 软件包 5
2.2.1 Simulink 概述 5
2.2.2 Simulink 常用模块介绍 6
2.3 SG3525 说明 7
2.3.1 SG3525 简介 - 7
2.3.2 SG3525 引脚 - 8
2.3.3 SG3525 的工作原理 8
第三章 隔离式半桥型开关电源设计 - 11
3.1 总体设计方案 11
3.2 隔离式半桥型开关电源 11
3.2.1 电容滤波的单相不可控整流电路 - 11
3.2. 2 半桥逆变电路 - 12
3.2. 3 半桥式 DC-DC 变换器的工作原理 - 13
3.3 电路设计 14
3.3.1 主电路设计 - 14
3.3.2 控制与驱动电路设计 20
3.4 总体电路图 - 21
第四章 Matlab 仿真电路 - 23
4.1 Matlab 工具使用 - 23
4.1.1 电源模块组（ Electrical sources ） - 23