Abstract
DC voltage is converted from one voltage level to another using a DC to DC converter. Applications of DC to DC converter includes self regulating power supplies, current sources to drive solid state lighting applications, advanced datacom and telecom systems, appliance control, DC motor drives, aircraft, etc. But controlling of this converter is vital task in conversion of power. Focus of this paper is to model a controlling system for buck converter which controls output of buck converter and keeps it constant instead of changing circuit parameters, load and input supply of the buck converter. The pulse width modulation (PWM), voltage mode control, PWM linear mode control with proportional controller (P), proportional integral controller (PI), and proportional integral derivative controller (PID) are some of the controlling methods fr used for dc-dc converters. But the performance of these methods are not satisfactory when there are large variations in parameters or load. This is why nonlinear controllers are used for controlling DC to DC converters. The nonlinear controller has the advantages that it reacts faster to a transient condition. Thus the Controlling method used to control buck converter in this paper is fuzzy control logic which is simulated in MATLAB/SIMULINK using fuzzy logic toolbox. The proposed strategy is then implemented on buck converter hardware setup such that for an input of 30 volts we get the desired output for variable references. Thus using Fuzzy controlling method less overshoots are obtained in the output of buck converter. This control system increases converter efficiency and power efficiency.
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