摘 要

我国激光产业的发展，虽然是一个初步发展，但在国际科技带领下已经完成了飞跃的发展，并且比同等质量有一个高阶段的突出。自从60年代第一台激光设备的诞生和应用开始，我国就有多位专家在激光行业付出了努力，并达到了国际一个微小的差值。在激光行业的发展同时，激光成套工业设备也进入了生产的市场，摆脱了长期依靠国外的局面，解决了国内激光行业的尴尬局面。激光随动系统是激光加工中非常重要的部分，而目前市场的激光随动系统大多是国外进口的，价格昂贵。实现国产化后，产品只需要进口价格十分之一的成本，市场前景非常广阔。所以研发一套可靠性高，性能好，低成本的激光随动系统具有广阔的前景。

其中调高器谐振头的作用是激光设备上的切割头和工件之间的间隙电容来检测和工件之间的距离，从而动态调整切割头的高度。由于间隙电容极其微小，受环境干扰严重，在恶劣的工作现场使用电容式调高系统要求系统具有特殊的信号处理手段和抗击环境能力。这是国内外许多厂商一直面临的难题。

本设计选用dsPIC33EP256MC502主控芯片并搭建其外围的硬件电路，利用MPLAB IDE开发环境实现其代码的编写。在电容控制系统实现的阐述上，文将重点放在下面几个方面上来论述：基于dsPIC数字信号处理器的下位机硬件电路设计，关于正反馈克劳电路，施密特触发器。具体研究内容如下：

在以dsPIC数字信号处理器为主控芯片搭建的外围电路的基础上，进行该部分的软件设计。

用正反馈克拉波电路测出频率，显示为正弦波正弦波通过施密特触发器变成方波测出周期方波通过dspic计算得出D

关键词：dsPIC，正反馈克拉波电路，施密特触发器，数字信号处理器

Resonant laser cutting head design to increase

ABSTRACT

The development of the laser industry, although a preliminary development, but in the international science and technology led to the development has been completed leap, and the same quality with outstanding a high stage. Since the birth of the first laser devices and applications since the 1960s, China had a number of experts in the laser industry have worked so hard, and to the international one tiny difference. At the same time in the development of the laser industry, laser complete sets of industrial equipment also entered the production market, out of over-reliance on foreign situation, to solve the domestic laser industry embarrassment. Laser servo system is laser processing a very important part, but the current market laser servo systems are mostly imported and expensive. After the realization of localization, product price only one-tenth the cost of imports, market prospects are very broad. Therefore, the development of a high reliability, good performance, low-cost laser servo system has broad prospects.

Which increase the resonance effect is the distance between the head gap capacitance cutting head and the workpiece between the laser device to detect and the workpiece to dynamically adjust the height of the cutting head. Since the gap capacitance is extremely small, serious environmental interference by using capacitive adjusting system require a system with special signal processing means and the ability to fight in the harsh environment of the job site. It is home to many manufacturers have been facing problems.

The design uses dsPIC33EP256MC502 master chip and its peripheral hardware circuit built using MPLAB IDE development environment to achieve its written code. On the elaborate control system for capacitance, the paper will focus on the following aspects up discussion: lower computer hardware design dsPIC digital signal processor based on positive feedback Crowe circuit, Schmitt trigger. Specific contents are as follows:

Positive feedback Kela Bo circuit measured frequency is displayed as a sine wave

Key words：dsPIC, positive feedback Kela Bo circuit, Schmitt trigger, a digital signal processor

目 录

1 绪论……………………………………………………………………………………….1

1.1课题研究的背景及意义………………………………………………………….2

1.2国内外现状及趋势………………………………………………………………. 2

1.3 论文主要研究内容……………………………………………………………….3

2 调高器谐振头的功能研究与方案设计…………………………………………..4

2.1调高器谐振头设计思路………………………………………………………….4

2.2激光切割对控制的要求………………………………………………………….4

2.3控制系统设计目标………………………………………………………………. 5

2.4模块各子系统划分与流程安排…………………………………………………5

2.5本章小结…………………………………………………………………………….5

3 调高器谐振头系统硬件设计……………………………………………………….7

3.1系统的硬件总体设计…………………………………………………………… 7

3.2 DSPIC33EP64MU502介绍………………………………………………………. 8

3.3 正反馈克拉波电路介绍……………………………………………………… 9

3.4耦合电容………………………………………………………………………….. 11

3.4.1 电容耦合的工作原理：……………………………………………….11

3.4.2 电容耦合的作用：…………………………………………………… 11

3.5施密特触发器…………………………………………………………………11

3.6分频器……………………………………………………………………………. 13

3.7电源部分…………………………………………………………………………… 14

3.8通讯模块电路……………………………………………………………….…… 15

3.9本章总结…………………………………………………………………………… 16

4 调高器谐振头系统的软件设计…………………………………………………… 17

4.1谐振头控制软件设计……………………………………………………………..17

4.2 电平引脚变化中断…………………………………………………………… 19

4.3 切割头脉冲产生方式………………………………………………………… 21

4.3.1 脉冲产生方式……………………………………………………………… 21

4.3.2定时器Timer1和Timer2……………………………………………………22

4.4 CAN总线简介…………………………………………………………………………25

4.5 本章总结………………………………………………………………………… 26

总结……………………………………………………………………………………27

参考文献……………………………………………………………………….……29

附录……………………………………………………………………………………31

1 绪论

1.1 课题研究的背景及意义

我国激光产业的发展，虽然是一个初步发展，但在国际科技带领下已经完成了飞跃的发展，并且比同等质量有一个高阶段的突出。以激光切割机来讲，市场的需求高达千万，为广阔的市场添加了新的生机。自从60年代第一台激光设备的诞生和应用开始，我国就有多位专家在激光行业付出了努力，并达到了国际一个微小的差值。在激光行业的发展同时，激光成套工业设备也进入了生产的市场，摆脱了长期依靠国外的局面，解决了国内激光行业的尴尬局面。激光随动系统是激光加工中非常重要的部分，而目前市场的激光随动系统大多是国外进口的，价格昂贵。实现国产化后，产品只需要进口价格十分之一的成本，市场前景非常广阔。所以研发一套可靠性高，性能好，低成本的激光随动系统具有广阔的前景。

激光切割产品介绍