DSP based Fuzzy controller applied to a DC-DC Boost converter

Hybrid fuzzy and robust controller applied to a DC-DC boost converter

“…In this way, the converter will respond the controller with an output voltage that will make the Fuzzy controller generate the required dutycycle to maintain it in 24 volts [3]. Figure 7 shows the fuzzy controller block diagram implemented in Simulink ® .…”

“…The gain K i needs to be tuned for directly providing a greater resolution of the error. The higher the resolution of the output voltage error, the greater is the error variation in steady-state [3]. Tuning the gains K i = 30, K o1 = 0.7 and K o2 = 0.45, we have the following system response showed in Figure 9.…”

“…Aiming to provide stability, power quality and quick response due to uncertainties and disturbances, some alternatives control techniques have been implemented in DC-DC converters [1][2][3][4][5][6][7][8][9]. A DC-DC converter receives a variable input voltage and produces a constant voltage at its output, where loads can be connected.…”

“…Proportional and Integral (PI) controller are already used to regulate the system output voltage of DC-DC converters, but conventional techniques like proportional and PI controllers do not consider uncertainties on the system. In the literature, Robust control and fuzzy control techniques were already used to regulate the output voltage considering the disturbances and uncertainties (input voltage and load variations) on the system [2,3]. Each one of these controllers has good performance in certain operational conditions.…”

“…However, its output response has an undesirable steady-state error. How much more the input voltage drops, greater is the steady-state error [3].…”