电子信息专业论文 基于单片机的程控电源的设计

基于单片机的程控电源的设计

摘要

电源是现代完成产品设计的最基本工具之一。采用单片机作为核心控制器件的程控电源具有输出电压电流可变，操作方便，便于携带等优点，是一种新型电源。无论在实验室还是在工程现场都有比较广泛的应用。本设计是基于STC12 系列的单片机进行的程控电源硬件电路设计，采用的是STC12C5410AD 单片机替代常规51 单片机加AD 模块的新模式。设计由主要控制模块、数控电源驱动模块、辅助电源模块、LCD 显示模块、按键操作模块五个模块组成。本设计以直流电压源为核心，STC12C5410AD 单片机为主控制器，通过键盘来设置直流电源的输出电压，设置步进等级可达0.1V，输出电压范围为0-25V，最大电流为1A，并可由液晶屏显示实际输出电压值。本系统由单片机程控输出数字信号，再经过运算放大器隔离放大，控制输出功率管的基极，随着功率管基极电压的变化而输出不同的电压，输入电压、反馈电压、反馈电流由LCD液晶显示器显示。最终可实现由LCD显示设置电压，及当前电压；通过加减键设置输出电压，步进0.1V，0-25V可调; 实时采样电流，并在LCD上显示出电流值。本文详细的分析了该程控电源的工作过程。

关键词：程控电源，STC12C5410AD，LCD，AD，51单片机

The Design of Programmable Power Supply based on

Single chip Microcomputer

ABSTRACT

Power supply complete the product design is the most basic of modern tools.Programmable power supply is in one of these new power supplies. Programmablepower supply with single-chip microprocessor control, advanced technology, allprogrammed, all key operations, small size, light weight, adjustable output parameters, easy to carry, both for the laboratory, you can also use the site. Its design system control module, NC power by driving module, auxiliary powermodule,display module, buttons were five modules adjust module. This design with dcvoltage source as the core, STC12C5410AD microcontroller, mainly through thekeyboard to set the controller dc power output voltage, setting stepping level can amountto 0.1 V, output voltagerange of 0-25V, maximum current 1A, and by the display on theLCD panel output voltage. The system is composed of single-chip microcomputerprogram-controlled output digital signal, and then after op-amp isolatingamplifier, control the output power tube, as the base of the base power tube voltageoutput different voltage changes, the input voltage，feedback voltage, feedback by LCDdisplay current. These designs ultimately realize functions: The system can use LCDdisplay Settings voltageand the current voltage. Through the addition and subtractionkey bindings output voltage, stepping 0.1V, 0-25V adjustable. The current real-timesampling is displayed on LCD and the current value. This paper analyzes in detail theworking process of the programmable power supply.

Keywords :SPC power,STC12C5410AD,LCD,AD,MCS—51

目录

摘要........................................................................................................... I ABSTRACT ............................................................................................... II 1 绪论 (1)

1.2 国内外研究现状、水平 (2)

1.3 本课题的发展趋势 (2)

2 程控电源系统基本理论 (3)

2.1 程控电源的工作原理 (3)

2.2 程控电源的设计指标 (3)

2.3 程控电源的系统组成 (3)

2.4 系统设计方案 (4)

2.4.1 系统可行性分析 (4)

2.4.2 设计方案比较 (4)

3 系统硬件的设计与实现 (6)

3.1 电路设计框图 (6)

3.2 STC12C5410AD 单片机介绍 (6)

3.2.1 STC12C5410AD 单片机特点 (6)

3.2.2 STC12C5410AD 工作类型 (8)

3.2.3 STC12C5410AD 的晶振及其连接方法 (9)

3.3 数字控制部分 (10)

3.3.1 复位电路 (10)

3.3.2 晶振电路 (10)

3.3.3 键盘电路 (11)

3.3.4 主控系统的整体结构 (12)

3.4 数控电源驱动电路以及其反馈模块 (13)

3.4.1 数控电源驱动电路连接 (13)

3.4.2 电压采样电路 (14)