ABSTRACT
This chapter deals with the interactive system modelling of fundamental topologies of second-order DC–DC converters such as buck, boost and buck–boost. The switching function concept is used to model these converters. The developed models are valid as long as the inductor current is continuous or the converter is in the continuous conduction mode (CCM) or the discontinuous conduction mode (DCM). DC to DC converters are used for transforming the DC input voltage from one voltage level to the DC output voltage at another voltage level. Boost converters are used for power factor improvement of AC–DC–AC converters used for AC drives. Cuk and single-ended primary inductance converters are used as power factor pre-regulators. These DC–DC converters are also used for charging mobile phones and laptops. Simulation of the boost converter for CCM and DCM operations were carried out using Simulink. In the DCM, there exists a short interval of time during which the inductor current is zero.
