摘要
为了研制升降温速率快、温度控制精度高的实时PCR仪,设计并构建了实时PCR仪中的电控系统。该系统硬件部分以DSP2812为核心,利用DSP2812自带的ADC和电压调理电路构成数据采集输入通道,同时DSP2812的事件管理器输出互补PWM,实现驱动半导体加热制冷片的目的。系统软件部分利用PID算法实现温度的闭环控制。实验结果表明ADC模数转换的平均误差率为0.11%,整个系统的温度变化率达到3℃/s,精度达到0.1℃。
In order to develop a real-tine PCR instrument with rapid temperature change rate and high accuracy,we design an electronic control system based on a DSP chip TMS320F2812.In order to sense the temperature,we utilize the voltage conditioning circuit,whose output is digitalized by the ADC module of TMS320F2812.Besides,the event manager is used to generate the complementary PWM and control the Peltier to complete heating or cooling.At the same time,we choose the PID algorithm to achieve the purpose of closed-loop control of the temperature.The test result shows that the average error rate of the ADC module is 0.11%.The temperature change rate of the system is 3 ℃/s and the accuracy is 0.1 ℃.
出处
《电子测量技术》
2011年第5期57-60,共4页
Electronic Measurement Technology
基金
国家科技重大项目(2008ZX10001-014\2008ZX10004-004)资助
