Abstract
Buck converter is a type of dc/dc power converters, which converts a direct current source from one voltage level to another. They are used for power supplies for office equipments, personal computers, telecommunications equipments, and spacecraft power systems, as well as drive control of dc motors [1]. Depending on circuit topology and application, there are many types of dc/dc converters, including buck converter, boost converter, buck-boost converter, Ćuk converter and single-ended primary inductance converter (SEPIC). The buck, boost, and buck-boost converters are basic dc/dc converters, and are usually used for power regulation, whereas Ćuk and SEPIC converter are constructed by combining these basic converters [2]. Buck converter steps down an input voltage to a lower output voltage while boost converter steps up an input voltage to a higher output voltage. Buck-boost, Ćuk and SEPIC converters are able to step up or down an input voltage, depending on the duty ratio of the power switch. Table 6.1 shows the topologies of buck, boost and buck-boost converters, which include a power switch, a diode, an inductor and a capacitor.
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