文档介绍：论文题目:基于单片机的数字PWM控制器设计与应用(硬件)
专业:微电子学
本科生: (签名)____
指导教师:刘树林(签名)____
摘要
PWM很大的一个优点是从处理器到被控系统信号都是数字形式的,无需进行数模转换,对噪声抵抗能力的很强,噪声只有在强到足以将逻辑1改变为逻辑0或将逻辑0改变为逻辑1时,也才能对数字信号产生影响,所以用来控制开关电源非常理想,得到了很好的应用。
进入20世纪80年代,随着全控型电力电子器件的出现及其迅速发展,PWM控制技术才真正得到应用。随着电力电子技术、微电子技术和自动控制技术的发展以及各种新的理论方法如现代控制理论、非线性系统控制思想的应用,PWM控制技术获得了空前的发展。尤其是PWM控制器应用于开关电源的控制,因为开关电源目前便携式设备市场需求巨大,DC-DC开关电源的需求也越来越大,性能要求也越来越高,使得DC-DC开关电源的设计也更具挑战性。
51单片机本身是没有PWM接口的,本文是通过软件实现PWM在一定的频率的方波中,调整高电平和低电平的占空比,控制BUCK电路。
关键词:数字PWM,占空比可调,开关电源
Subject:Based on Single Chip puter digital PWM controller design and application (hardware)
Specialty:Microelectronics
Name: Wang Lei Signature
Instructor:Liu Shulin Signature
ABSTRACT
One advantage of a PWM from processor to be control system is in the form of digital signal and no analog-to-digital conversion, the strong resistance to noise, the noise in strong enough to will only logic 1 change for logic 0 or will logic 0 change for logic 1, can also influence of digital signal, so used to control switch power supply very ideal, got a good application.
In the 1980 s, as all-controlling power electronics device of the emergence and its rapid development, PWM control technology to really get the application. Along with the power electronic technology, microelectronics technology and automatic control technology and the development of new methods such as the theory of modern control theory, the application of the nonlinear control system, PWM control technology achieved unprecedented development. Especially PWM controller used in the control of switch power supply, because the switch power supply currently portable equipment large market demand, DC-DC switch power demand is more and more big, the performance requirements also more and more high, make DC-DC switch power design also is more challenging.
51 Single Chip puter itself is no PWM interface, this paper is through the software implementation in certain frequency PWM of square wave, adjust the high level and low l