HE Hao, FENG Ji-hong, LI Kai-xiang. Research and fabrication of temperature control system of real-time PCR instrument based on DSP[J]. 2014, 33(5): 95-98.
HE Hao, FENG Ji-hong, LI Kai-xiang. Research and fabrication of temperature control system of real-time PCR instrument based on DSP[J]. 2014, 33(5): 95-98. DOI: 10.13873/j.1000-97872014.05.017.
Develop a temperature control system based on DSP chip TMS320F2812 for small real-time PCR instrument. PWM wave generated by DSP through power amplifier circuit to drive semiconductor cooler
and the Pt100 as temperature sensor to build a bridge sensing circuit eliminating nonlinear error. Temperature signal is converted to voltage signal
which is sent to A / D converter module of DSP and at the same time carry out position PID algorithm
then adjust the duty cycle of the PWM wave
so the temperature signal is controlled by closed-loop system. Experimental results show that heating and cooling rate of the system can reach 4 ℃ / s
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