基于DSP的实时PCR仪温度控制系统研制

发布时间：2018-03-23 01:32

  本文选题：实时聚合酶链式反应　切入点：数字信号处理器　出处：《传感器与微系统》2014年05期 　论文类型：期刊论文

【摘要】：为小型实时聚合酶链式反应(PCR)仪研制一种基于数字信号处理器(DSP)芯片TMS320F2812的温度控制系统。由DSP产生的脉冲宽度调制(PWM)波经功率放大电路驱动半导体加热制冷片以Pt100作为温度传感器构建一种消除非线性误差的电桥传感电路,将温度信号转换为电压信号,电压信号送入DSP的A/D转换模块,同时进行位置式PID算法,然后调节PWM波的占空比,使整个系统对温度信号达到闭环控制。实验结果表明:系统的升降温速率能达到4℃/s,精度为0.2℃。
[Abstract]:A temperature control system based on digital signal processor (DSP) chip TMS320F2812 is developed for a small real time polymerase chain reaction (PCR) instrument. The pulse width modulation (PWM) generated by DSP is driven by a power amplifier circuit to drive the semiconductor heating chiller. Pt100 is used as a temperature sensor to construct a bridge sensing circuit to eliminate nonlinear error. The temperature signal is converted into the voltage signal, and the voltage signal is fed into the A / D conversion module of DSP. At the same time, the position-type PID algorithm is carried out, and then the duty cycle of the PWM wave is adjusted. The experimental results show that the temperature rising and cooling rate of the system can reach 4 鈩，

本文编号：1651328