Abstract
In this paper, we develop a temperature control system based on DSP chip TMS320F28335 for a small real-time PCR instrument. In the system, PWM waves generated by the DSP passes through power amplifier circuit to drive the peltier, and a pt100 is used as a temperature sensor to build a Wheatstone bridge sensing circuit. The temperature signal from the pt100 is converted into voltage signal. Then the voltage signal goes through the A/D converted module and the Position PID algorithm to adjust the duty cycle of the PWM waves. Experimental results show that the system's rising and cooling rate can reach 4°C/s with an accuracy of 0.2°C.
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