For many pieces of electronic equipment, whether it’s a complex infotainment system or a simple battery-power IIoT sensor, some form of power conversion is required. However, several types of switching mode topologies are available to choose from for DC/DC and AC/DC power conversion. Selecting the type largely depends on the required voltage levels and the amount of power needed. This article covers the basic concepts of power conversion, including isolation and voltage regulation. It also investigates some of the most popular topologies available for use in discrete and module-based designs.