ABSTRACT
A range of dc-dc switch-mode converters are used to convert an unregulated dc input to a regulated dc output at a required voltage level. They achieve the voltage regulation by varying the on-off or time duty ratio of the switching element. There are two main applications. One is to provide a dc power supply with adjustable output voltage, for general use. This application often requires the use of an isolating transformer. The other main application of dc-dc converters is to transfer power from a fixed dc supply, which may be rectified ac, to the armature of a dc motor in the form of adjustable direct voltage.
