电气工程与自动化专业毕业论文06819.doc

i毕业设计（论文）题 目基于 CAN 总线的大型粮库测温系统设计ii开关电源系统设计摘 要随着电力电子技术的发展，电子设备的种类越来越多，电源在各个系统中的核心作用日趋明显另外，电子设备的小型化和低成本化促使电源向轻、薄、小和高效率方向发展基于这个思想设计了一款低功率易控制的开关稳压电源，以满足小型电子设备的供电需要系统的实现是基于PWM波控制下的DC-DC转换原理系统以单片机MSP430F169为控制核心，采用SG3525PWM脉宽控制器实现对Boost升压斩波电路稳压输出系统硬件部分主要包括：整流滤波电路、Boost斩波电路、PWM波形产生与控制电路、采样电路、保护电路、单片机最小系统等软件包括：键盘控制模块、A/D电压和电流采集模块、调整模块、显示模块等几个部分系统能够实现电压输出在30～36V范围内可调，输出电流最大可达2A，电压调整率小于3%，效率达83.7%系统具有电压键盘设定和输出显示功能，同时具有过压、欠压和过流保护功能关键词：开关电源，单片机MSP430，PWM控制芯片，DC-DC变换iiiSwitching Power Supply DesignAbstractAlong with the development of the power electronic technology, the kinds of electronic equipment have been more and more, power supply’s core role in every system has become increasingly obvious. In addition, the miniaturization and low cost of electronic equipment turn power to the direction of light, thin, small and high efficient. Based on this idea, the design has designed a low-power and easy controlled switching power supply to meet the power supply needs of small-scale electronic equipment .System implementation is based on the DC - DC conversion principle which is under the control of PWM waves. System to single-chip microcomputer MSP430F169 as the control core, using SG3525PWM pulse- width controller to achieve Boost chopper circuit’output voltage stable. System hardware includes: rectifier filter circuit, Boost chopper circuit, PWM waveform generation and control circuit, sampling circuit, protection circuits, thesingle-chip microcomputer minimize system. Software includes: keyboard control module, the voltage and current A / D acquisition module, adjusting module, display module, and several other parts. System can realize output voltage at the range of 30 ~ 36V adjustable, output current is up to 2A, Voltage adjustment rate is less than 3%, efficiency of 83.7%. System has the function of voltage keyboard settings and output display, but also has overvoltage, undervoltage, and overcurrent protection.Keywords: switching power supply, microcontroller MSP430, PWM control chip, DC-DC conversionI目 录第一章第一章 绪论绪论∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙11.1 设计背景和研究目的∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙11.2 设计的主要研究工作∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙11.3 设计目标∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙2第二章第二章 系统总设计方案系统总设计方案∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙3第三章第三章 系统硬件设计系统硬件设计∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙43.1 整流滤波电路∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙43.1.1 二极管整流桥堆和滤波电容 C1 的选择.................................................................43.1.2 保护整流桥和减小冲击电流的设计........................................................................53.2 DC-DC 变换器设计与器件选择 ∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙53.2.1 电路的工作原理........................................................................................................63.2.2 器件的选择................................................................................................................63.2.3 减小开关转换纹波电压设计....................................................................................83.3 采样电路∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙83.4 PWM 波形产生与控制电路 ∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙93.5 驱动电路的设计∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙103.6 保护电路设计与参数计算∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙123.6.1 SG3525 自带保护.....................................................................................................123.6.2 保护电路的设计......................................................................................................123.6.3 继电器保护..............................................................................................................133.7 按键与显示电路∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙143.7.1 按键输入模块设计..................................................................................................143.7.2 显示模块设计..........................................................................................................143.8 单片机最小系统∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙14II3.8.1 电源..........................................................................................................................153.8.2 复位电路....................。