Track: Energy and Resource Efficiency

Abstract

Switch mode power supplies play a vital role in the applications of computers, telecommunications and mobile chargers due to their fast-dynamic response and less power consumption. These power supplies require sophisticated and powerful solid state devices to withstand greater variations of input line voltage and load. The performance analysis of buck converter against these changes is presented in this research work. These changes are controlled with single and cascaded control schemes. Initially, the buck converter is implemented with a single output voltage loop and then a cascade control scheme. Both control schemes are designed with Proportional, Integral and derivative (PID) controllers. The cascade control scheme consists of two loops that are current and voltage loops. The buck converter is decomposed into two first-order systems and its dynamics are controlled with a cascade control scheme. These control schemes are developed and simulated in Simulink toolbox of MATLAB software. The simulated results of the buck converter with a single loop are compared to the cascaded loop. The analysis shows that with the addition of an inner current loop in cascade control scheme, the inductor current of buck converter is reduced.