基于STM32单片机的三端口DC-DC变换器

基于STM32的三端口DC-DC变换器摘要随着煤炭、石油等传统化石能源的大力开采使用，人类给生态环境造成了不可挽回的污染，发展可持续清洁能源成为了当今国内外研究的热点。由于传统分布式光伏发电系统使用的独立变换器数量过多，增大了系统体积与建造成本且效率低。为解决这个问题，本文提出了一种基于STM32F103C8T6单片机的变换器，它具有三端口，分别是光伏电池端、可充电池端和负荷端，并且能够实现三个端口工作模式的自动转换。在本次设计中，主电路拓扑设计为H桥Buck-Boost电路，通过改变H桥电路中MOS管的导通，来使PWM信号的占空比发生改变，从而实现电压的升降压变换和功率流动。单片机模块能够提供3.3V的电源，而电池组模块则能够提供16V的电源。电压检测电路将采样电压反馈到单片机控制模块，然后利用MPPT算法，实现变换器的工作模式转换。经测试，输出端的电压检测电路将输出反馈回单片机，由单片机发送信号给R2101s芯片驱动H桥电路运行，最后通过PD调节，实现在各种情况下负载端都输出稳定的30V直流电压。整个系统由软件和硬件组成，软件部分采用C语言编写程序，做到以简单的方式进行编程，降低编程错误，达到设计效果。关键词：光伏发电系统：三端口DC-DC变换器；MPPT算法：PID调节；模式转换Three-port DC-DC Converter Based on STM32AbstractWith the exploitation of coal,oil and other traditional fossil energy,human beings havecaused irreversible pollution to the ecological environment,the development of sustainable cleanenergy has become a hot spot at home and abroad.Due to the excessive number of independentconverters used in traditional distributed photovoltaic systems,the system size and constructioncosts are increased and the efficiency is low.In order to solve this problem,this paper presents aconverter based on STM32F103C8T6 single-chip microcomputer.It has three ports,which arephotovoltaic cell terminal,rechargeable cell terminal and load terminal,and can realize theautomatic conversion of three ports working mode.In this design,the main circuit topologydesign for the h-bridge Buck-boost circuit,by changing the H-bridge circuit MOS transistor on,to make PWM signal duty cycle changes,thus,the step-up and step-down voltage conversionand power flow are realized.Microcontroller module can provide 3.3 V power,and the batterymodule can provide 16 V power.The voltage detection circuit feeds back the sampling voltage tothe MCU control module,and then uses the MPPT algorithm to realize the mode conversion ofthe converter.After testing,the voltage detection circuit of the output terminal feeds the outputback to the MCU,which sends a signal to the IR2101s chip to drive the H-bridge circuit to run,and finally adjusts it by PID,the load terminal can output a steady 30V DC voltage under variousconditions.The whole system is made up of software and hardware.The software is programmedin C language.It can be programmed in a simple way to reduce programming errors and achievethe design effect.Keywords:Photovoltaic power generation system;Three-port DC-DC converter;MPPTalgorithm;PID adjustment;Mode conversion目录摘要...Abstract...…111前言..。1.1三端口DC-DC变换器研究的背景与意义1.2国内外研究现状.......21.2.1国内研究现状...…21.2.2国外研究现状..31.3三端口DC-DC变换器发展趋势31.4研究内容及预期目标....2系统方案与总体设计.….52.1系统设计要求......。52.2最大功率跟踪算法原理.....52.3系统方案原理...62.4系统工作状态分析...2.3.1模式I分析0.72.3.2工作模式分析....2.3.3负载改变工作模式的改变…….103系统硬件部分113.1主要器件的选择......113.1.1单片机的论证与选型113.1.2IRF540场效应管..113.1.3IR2101s驱动芯片.123.1.41602液晶显示...133.2硬件电路设计..133.2.1单片机控制电路.......133.2.2电源电路...153.2.3滤波电路.....163.2.4IR2101s驱动电路.…17