STC89C52单片机的直流稳压可调电源设计+电路图+流程图.docVIP

STC89C52单片机的直流稳压可调电源设计+电路图+流程图 摘要：为了实现直流稳压电源输出电压可调节，采用以STC89C52为核心的控制芯片来完成2~20V直流稳压输出。本设计以STC89C52单片机作为控制芯片，单片机接受来自扩展存储器和键盘的输入信号，输出给数模转换芯片DAC0832再经比较放大实现稳压输出，为提高设计的控制精度采用模数转换芯片ADC0804对输出电压进行采样从而使整个控制系统构成一个闭环控制系统。经仿真实验结果显示，输出电压范围为2V～20V，额定工作电流为1.0 A，并具有ldquo;+rdquo;、ldquo;－rdquo;步进电压调节功能，其最小步进为0.1 V，纹波小于0.1V，用LCD1602显示其输出电压值。该设计具有使用简便、稳定性好、响应快等优点。4995 关键词：STC89C52单片机；直流稳压可调电源； DAC0832；ADC0804 The Design for Regulated DC Power Based on MCU Abstract: To realize the controlling function of the output voltage of the regulated DC power supply, the output voltage of the 2-20V regulated DC power supply can be displayed by the design in the core of STC89C52. STC89C52 is regarded as the control chip. The input signals from the extended memory and the keyboard are received by MCU, which are droved to DAC0832mdash;a digital-to-analog converter chip. In the final, through comparative amplification, the regulated output voltage can be achieved. In order to improved the control precision of system. ADC0804 which is a analog-to-digital conversion chip is used to take samples for the output current. Thus, the whole control system is made up of a closed loop control system. The results of simulation and experiment show that the range of output voltage is2V-20V and the rated operational current is 1.0A,besides,the system possesses the function of ldquo;+rdquo;、rdquo;-rdquo;, the smallest step voltage value is 0.1V and the rappel wave is not more than 0.1V. At the same time, the output voltage is displayed by LCD1602. It can be proved that the design has some obvious advantages, such as the ease of use、better stability、higher respond speed and so on. 1. 设计概述 1.1 研究背景及意义 电源作为各种用电设备的基础部件，在用电设备中起着至关重要的作用。一个用电设备电源性能的高低，直接关系到用电设备是否能够正常和稳定的工作。另外，一个安全稳定的电源不仅能够增加用电设备的使用寿命还能为电气设备使用者提供基本的安全保障。而电源技术尤其是基于单片机的直流稳压可调电源是一门实践性很强的工程技术，能够服务于各行各业。当今电源技术融合了电气、电子、系统集成、控制理论、材料等诸多学科领域。直流稳压电源是常用的仪器设备之一，广泛应用于教学、科研、生活等各个领域，是电子实验员、电子设计人员及电路开发部门进行实验操作和研究不可缺少的电子仪器。在各种电子电路中，通常都需要一个甚至是几个电压稳定的直流稳压电源来供电。而整个稳压