基于PWM和PID对三维打印喷头的恒温控制  

Based on the PWM and PID temperature control of 3D printing head

作　　者：陈涵[1] 陆蕴香[1] 乔玉鹏[1] 伍权[1] 徐卫平[1] 

机构地区：[1]贵州师范大学机械与电气工程学院,贵州贵阳550001

出　　处：《贵州师范大学学报（自然科学版）》2015年第2期72-75,共4页Journal of Guizhou Normal University：Natural Sciences

基　　金：贵州科学技术基金资助项目(黔科合J字LKS[2012]05号);微滴喷射成型制备人工骨骼研究(11904-05032130022)

摘　　要：为提高三维打印喷头的温度控制精度与响应速度,以DSP F2812为系统控制芯片,以LM2575开关电源芯片为温控执行元件,设计了一小型温度控制系统。该系统利用MAX6675芯片采集温度,通过冷端补偿和数字过滤实现精密温度测量;通过DSP产生的可变占空比PWM波来实现对喷头温度的PID控制,采用模拟仿真与实验验证相结合的方法得到更为理想的PID控制。将原来的300s左右进入恒温状态提高到75s左右达到恒温状态,温度检测分辨率为0.25℃,提高了三维打印恒温控制的性能。By use of the main chip DSP F2812 and switching power chip LM2575,a constant temperature system was built to control the 3 D printing head.In order to improve temperature control accuracy and response speed.The precise temperature measurement uses was realized by means of cold junction compensation and digital filtering method,with the use of chip MAX6675 for temperature data collecting; the printing head temperature PID control was realized by the variable duty ratio of PWM wave come out from DSP,furthermore,more ideal PID control was acquired by combination of simulation and experiment.The original 300 seconds into the constant temperature increased to 75 seconds to achieve constant temperature state,Temperature detecting resolution of 0.25 ℃,To improve the performance of the 3 d printing temperature control.

关 键 词：恒温控制 DSP F2812 PID PWM 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]