Design Of Dynamic Compensator Reconfiguration PID Controller

TMS320C2000 and F28044, which is from TI Company, are used to achieve a digital DC/DC converter. The purpose of experiment is to design a dynamic configuration PID controller to achieve a 1.5V DC output voltage in the digital DC/DC converter. Using CCS to understand control algorithms developed in C language, and then analyzes interior structure of digital PID controller. The parameters contain proportional gain, integral gain and differential gain. Collecting data of output voltage when in different parameters values by the oscilloscope, analyze and get three conclusions that larger proportional gain causes stronger noise, larger integral gain make recovery time shorter, and output voltage will drop when differential gain becomes larger. According different values have different impacts on characteristics PID controller, divide recovery time period to four modes:low circuit current mode (LCCM), rapid response mode (RRM), and low noise mode (LNM) and high circuit current mode (HCCM). Each mode required different value sets of PID parameters. Hence, setting different parameters' value, then modifying algorithm and implementing in the DSP. As a result, get a 1.5V DC output voltage. Moreover PID controller in the digital DC/DC converter is dynamic and configuration.Consequently, different value sets of PID parameters play as different characteristics of PID controller. Using the PID controller designed in this paper, we get an output voltage of which recovery time is 327.7us shorter and noise is 86mV.