基于PWM的标准光源控制系统设计

文档编号:DQ124   文档字数:12429,页数:39

摘  要
 
 汽车前照灯检测仪校准器是光轴可以转动的标准光源,它由光源、直流稳压电源及电压表、光轴角转动及读数机构、水平调整机构和找正机构等部分构成。按JJG 967-2001机动车前照灯检测仪校准器检定规程要求,应对其发光强度、光轴角及水平调节机构进行计量性能检定以保证其正常使用。本次设计考虑到大功率管在使用上的局限，使用了在功能上可以替换大功率管调节的另一种调节方式，即采用PWM调节控制输出电压，这样可以保证标准光源的输出光照强度不会出现因线性电路存在漂移而不精确的问题，更为准确的调节输出电压来达到目的。
 
关键词 前照灯检测仪；校准器；PWM

 
Abstract

Calibrators of Headlamp Tester for Motor Vehicle is the standard source which the optical axis can rotate. It consists of lighting, DC regulated power supply and voltage meter, optical axis angle of rotation and reading institutions, horizontal adjustemt institutions and the parts of find are institutions. By JJG 967-2001 Motor Vehicle headlamp tester calibrator verification procedures required, we should deal with its luminous intensity, the optical axis angle and the horizontal adjusting mechanism for measuring the performance test to ensure its normal use. The design considerations to the limited of the power tube use. We use in the functional regulation can replace the power control means another adjustment, that adjustment by PWM control of output voltage, so we can ensure that the standard output of light intensity light source is not occur due to the existence of linear electric drift problem without accurate, more accurate output voltage regulation to achieve their goals.
 
Keywords  Headlamp Tester；Calibrators；PWM 

目  录
摘要 II
Abstract III
目  录 IV
1  绪 论 1
2  总体设计方案 3
 2.1  系统结构设计 3
 2.2  系统控制面板设计 4
3  系统硬件电路设计 5
 3.1  基于PWM的电路设计 5
 3.2  液晶屏电路设计 7
 3.3  按键电路设计 9
 3.4  供电电源电路设计 10
 3.5  激光器电路设计 10
 3.6  蜂鸣器电路设计 11
 3.7  数据存储器电路设计 11
 3.8  复位电路设计 12
 3.9  DEBUG指示灯电路设计 13
 3.10  主控电路设计 13
4  软件设计 16
 4.1  使用函数说明 16
 4.2  程序设计 16
5  总结 22
致谢 23
参考文献 24
附 录1 26
附 录2 27

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