Abstract
Nonisolated switch-mode DC–DC converters are used in the design of different renewable energy systems. In photovoltaic solar energy systems, these converters are used to regulate and control the amplitude of the solar panel output voltage. There are three basic nonisolated switch-mode DC–DC converter topologies: step down (buck), step up (boost), and step up or down (buck–boost). For each of these converter topologies, the converter design and continuous conduction mode analysis are presented here. In switch-mode DC–DC converters, the amplitude of output voltage is controlled by controlling the duty ratio of the pulse at the input of the converter switch, and turning the converter switch on and off every cycle stores and then releases energy in the converter inductor. This chapter also covers the single ended primary inductance converter (SEPIC). SEPIC is a step-up or step-down switch-mode DC–DC converter that has low harmonic content and low component stress.
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