基于MSP430的直流电子负载设计+电路图+源程序
关键词： 直流电子负载；恒流；单片机；过压保护；
毕业设计说明书（论文）外文摘要
Title Dc electronic load design based on MSP430
Abstract
This design is based on MSP430f6638 microcontroller to control chip of a dc electronic load. Analog part adopts the field effect tube as the main circuit switch tube, using single-chip microcomputer with D/A converter output control signals to drive the op-amp and constant current circuit, composed of field effect tube. At the same time, the MCU own 12 bit A/D converter for electric signal sampling, can real-time display the current in the circuit on the LCD screen size. MCU can carry on the real-time sampling and real-time control to the output current, ma reached 0 ~ 1000 ma range resolution less than 20 ma constant current control. And the voltage is greater than 10 v dc electronic load at both ends, can be protected. Constant current value can be set through the pressed key input, on the sections of the LCD display, has good man-machine interactive.
Keywords: dc electronic load; Constant current; Single chip microcomputer; Over voltage protection;
目录
1绪论 1
1.1 研究背景 1
1.2 研究目的和意义 1
1.3 本设计的功能和指标 2
2系统方案分析 2
2.1系统总体框图设计 2
2.2系统方案选择 3
2.2.1 控制芯片 3
2.2.2 输入设备 3
2.2.3 显示设备 3
2.2.4 恒流模块 4
2.2.5 数模转换模块 4
2.2.6 过压保护模块 4
3 系统硬件设计 5
3.1 恒流模块 5
3.1.1 场效应管简介 5
3.1.2 运算放大器OP07 6
3.1.3 采样电阻 6
3.1.4 恒流电路构成 7
3.2过压保护模块设计 9
3.2.1 稳压二极管 9
3.2.2 继电器 10
3.2.3 过压保护电路构成 11
3.3 单片机最小系统的设计 12
3.3.1 MSP430单片机简介 13
3.3.2 DY-FFTB6638平台使用 15
4 系统软件设计 18
4.1编译环境 18
4.2主程序流程图 18
4.3初始化程序 18
4.4按键程序 19
4.5 AD采样程序 19
4.6 DA转换程序 20
4.7 液晶显示程序 20
5 调试和测试过程中的问题分析 21
5.1采样电阻 21
5.2 电路零漂的问题 22
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