Design, Control and Simulation of Buck Converter using PID controller and Reference Regulator Technique

Abstract

In this paper explains about DC-to-DC buck converter design and control of output voltage by using a PID control technique and reference regulator technique and circuit testing with different change in resistance value. Buck converters are step-down converters, where output voltage is lower than input voltage. DC-DC buck converter is a power electronics circuit, which converts one voltage value to another value with step down level. Voltage in this type of converters controlled through switching by storing energy in circuit and releasing it afterwards to output at given voltage level. Buck converter topology is used in this paper with the controlled output voltage by the PID control and reference regulator technique and testing of the circuit with changing different resistance value. This conversion method is more efficient than voltage division, where unwanted power dissipated as heat. In this paper input voltage is 200V, output voltage is obtained is 100V by the simulation model results. Considered: R = 120 ohm (90 ohm for testing under higher load) R2 = 980 ohm connectable resistance L = 10-6H C = 6x10-6 F PID controller: P = 2 , I = 310, D = 400. Frequency of switching is 300 kHz values. First two parts of this paper introduces design analysis of the circuit in Simulink. Third part includes stress test experiments verifying with changing in different resistance value in order to verify specifications.