ABSTRACT - In this paper, an ANFIS controller is designed for the control of Buck converter to maintain its output as a constant for a varying input supply. To meet the power needs of a constant output, this study examines the DC / DC converter with primarily focusing on the design of ANFIS controller for the control of Buck converter. Resistive load is replaced with DC motor load and speed control loop is added in order to control the speed of the motor. The simulation is to be carried out in MATLAB/Simulink software.
INTRODUCTION
There are many global concerns about the world’s energy problem. As fossil fuels have proved to be unstable and limited, it is crucial to find other energy resources. Renewable energy resources seem to be the best choice in case of their reliability and accessibility. Considering that DC-DC converters are applied for the renewable energies, there are new demands for efficient DC-DC converters. Among DC-DC converters, buck converters are applicable in cases that a reduced voltage is required like in charger applications. Efficiency is a crucial factor to be considered in DC-DC converters. Utilizing these converters in high frequencies with least possible losses, including the switching losses and the reverse recovery losses is the main reason for designing these converters. Many structures have been proposed for reducing these losses. The mentioned topology provides soft-switching capability for the power switches. However, some diodes still have reverse recovery losses and the complex auxiliary circuit of this converter causes a lot of losses which can reduce the overall efficiency. A new soft-switched DC-DC buck converter based on resonant circuits is investigated. In this topology, a resonant circuit which consists of a resonant switch, an inductor, a capacitor, and a diode is utilized to provide soft-switching condition for the power switches In this structure, using resonant circuit has led to flow an additional resonant current which can increase the conduction losses. A new ZVS buck converter is presented. Using tapped inductor and an additional auxiliary circuit not only provides soft-switching capability for the switches’ turn-on but also decreases the flowing current which makes it possible to reduce conduction losses. However, the turn-off losses of the switches and diodes’ reverse recovery losses reduce the efficiency.
PROBLEM STATEMENT
In this, ANFIS controller is trained to control the speed of the dc motor using the dc voltage control. The dc voltage control loop for the buck converter is designed with resistive load and speed control loop is added for dc motor load. The datas are taken using PI controller based speed control loop and the training of ANFIS control is done using those datas. The performance of the controllers are compared in terms of steady state error, settling time, risetime, etc.,