Dynamic Modelling and Simulation of DC-DC Converters

Abstract

The DC-DC converter is an electrical circuit that transfers energy from a dc source to an electrical load. [1] The energy is first transferred into the energy storage elements by using the electronic switches, and then afterwards from the storage elements to the load. The storage elements are inductors and capacitors. [2] The transient analysis of the convertersis important to see the dynamic performance of the circuit. The simulations are to be performed to observe the effects of the values of inductor and capacitor on the dynamic performance of the converters. To facilitate the simulation process, the differential equa- tions are formulated into the state-space model of the circuit. The DC-DC converter has the special distinction of being a system of variable structure, that is, the circuit topology changes in accordance with the switching action of the semiconductor devices. The state-space model, therefore, must describe the dynamic behavior of the circuit for each portion of the switching cycle. In this project, the MATLAB software will be used for the state-space model simulation of the converters to see the dynamic performance of the converters in the continuous conduction mode (CCM) and discontinuous conductionmode (DCM).