本文選題：實時聚合酶鏈?zhǔn)椒磻?yīng)　切入點：數(shù)字信號處理器　出處：《傳感器與微系統(tǒng)》2014年05期 　論文類型：期刊論文

【摘要】：為小型實時聚合酶鏈?zhǔn)椒磻?yīng)(PCR)儀研制一種基于數(shù)字信號處理器(DSP)芯片TMS320F2812的溫度控制系統(tǒng)。由DSP產(chǎn)生的脈沖寬度調(diào)制(PWM)波經(jīng)功率放大電路驅(qū)動半導(dǎo)體加熱制冷片以Pt100作為溫度傳感器構(gòu)建一種消除非線性誤差的電橋傳感電路,將溫度信號轉(zhuǎn)換為電壓信號,電壓信號送入DSP的A/D轉(zhuǎn)換模塊,同時進(jìn)行位置式PID算法,然后調(diào)節(jié)PWM波的占空比,使整個系統(tǒng)對溫度信號達(dá)到閉環(huán)控制。實驗結(jié)果表明:系統(tǒng)的升降溫速率能達(dá)到4℃/s,精度為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，

本文編號：1651328