北京交通大学模电研讨报告.docx

基于MSP430的开关稳压电源设计李帆 刘强 李亚伟北京交通大学 电子信息工程学院 电子1101摘 要：随着电子技术的发展，电子系统的应用领域越来越广泛，电子设备的种类也越来越多，对电源的要求更加灵活多样。电子设备的小型化和低成本化使电源以轻、薄、小和高效率为发展方向。传统的晶体管串联调整稳压电源，是连续控制的线性稳压电源，这种传统稳压电源技术比较成熟。并且已有大量集成化的线性稳压电源模块，具有稳定性能好、输出纹波电压小、使用可靠等特点。但其通常都需要体积大且笨重的工频变压器和隔离之用，滤波器的体积和重量也很大。而调整管工作在线性放大状态，为了保证输出电压稳定，其集电极与发射极之间必须承受较大的电压差，导致调整管功耗较大，电源效率很低，一般只有45%左右，另外，由于调整管上消耗较大的功率，所以需要采用大功率调整管并装有体积很大的散热器，于是它很难满足电子设备发展的要求。从而促成了高效率、体积小、重量轻的开关电源的迅速发展。介绍基于MSP430单片机的开关稳压电源的系统结构和总体设计方案，该设计硬件电路有整流滤波电路、升压斩波电路、PWM驱动电路及保护电路组成。该系统的软件功能主要包括12高精度A/D采集、PWM驱动电路、过流保护等模块的实际，同时具有键盘设定、液晶显示实时等功能。关键词：MSP430；开关稳压电源；PWM；升压斩波Design of switching power supply based on MSP430Li Fan Liu Qiang Li YaweiBJTU School of Electronic Information Engineering Electronic 1101Abstract:With the development of electronic technology, application field of electronic system is more and more extensive, electronic equipment species more and more, the demand for power is more flexible and diversified. Electronic equipment miniaturized and low cost in the power of light and thin, small and efficient for development direction. The traditional serial adjustment manostat, transistor is continuous control linear manostat, this traditional manostat technology more mature. And there have been many integrated linear manostat module, has the stable performance is good, output ripple voltage small, reliable operation, etc. But its usually need are bulky and heavy industrial frequency transformer and isolation with, filter the bulk and weight are also great. And adjust the tubes work in linear amplification state, in order to guarantee the output voltage stability, between the collector and emitter voltage difference must bear larger, resulting in bigger, power regulating transistor power consumption is very inefficient, usually only around 45%, moreover, due to the adjustment of the tube consumption, so need large power by high power adjustment tube and equipped with large radiator, so it is difficult to meet the requirements of the development of