大气与环境光学学报, 2016, 11 (3): 234, 网络出版: 2016-06-12
基于光声光谱系统的温度控制器的设计
Design of Temperature Controller Based on Photoacoustic Spectrum System
Pt1000 温度传感器 帕尔贴效应 PID控制 模数转换器TLC3574 temperature sensor Pt1000 Peltier effect PID controller ADC-TLC3574
摘要
精确控制光声光谱实验系统温度有助于提升系统灵敏度及稳定性。设计的温度控制系统由单片机STC12C5A60S2控制,以铂电阻Pt1000为温度传感器, Pt1000采用四线制接法,有效消除了引线电阻引起的误差,其信号处理电路由仪表放大器AD620构成。介绍了14位高速率模数转换器TLC3574的典型 工作电路,参考电压由LM4040提供。半导体制冷片由单片机输出的PWM波控制电流方向及导通时间,实现制冷加热,其驱动电路为场效应管H桥电路。 所设计的温度控制器控制范围0~40℃,控制精度达到0.06 ℃。
Abstract
Accurate control of the temperature of photoacoustic systems is helpful to improve the detection sensitivity and stability. The temperature controller is composed of microcontroller STC12C5A60S2 and temperature sensor Pt1000. The four-wire method of Pt1000 effectively eliminates the error due to the lead resistance. The temperature signal processing circuit adopts instrument amplifier AD620. 14 bit high rate ADC (analog to digital converter) TLC3574 is used to transfer temperature voltage acquired by microcontroller and its reference voltage is provided by LM4040. The driver circuit of Peltier is H-bridge MOSFETS controlled by PWM wave from STC12C5A60S2. The duty ratio of PWM wave determines the current direction and conduction time to realize heating or cooling. The control range of temperature is from 0 ℃ to 40 ℃ and the sensitivity is 0.06 ℃.
王高旋, 庞涛, 崔小娟, 孙鹏帅, 张志荣, 夏滑, 吴边, 董凤忠. 基于光声光谱系统的温度控制器的设计[J]. 大气与环境光学学报, 2016, 11(3): 234. WANG Gaoxuan, PANG Tao, CUI Xiaojuan, SUN Pengshuai, ZHANG Zhirong, XIA Hua, WU Bian, DONG Fengzhong. Design of Temperature Controller Based on Photoacoustic Spectrum System[J]. Journal of Atmospheric and Environmental Optics, 2016, 11(3): 234.