Abstract

One of the most important sources of renewable energies is the solar energy. But, because of the low output voltage characteristics of the common solar cells, a dc-dc converter is usually used to trace the maximum power point and to increase the output voltage to a desired value. Although, high voltage gains can be obtained in some switched-capacitor converters (SCC), but their currents are generally containing some high current spikes that limit the efficiency and output power, and also their load voltage regulations are weak. To overcome these problems, a high step-up switched-capacitor converter is proposed and analyzed, here, without any current spikes and with zero voltage switching (ZVS) capability that lead to low EMI noise and switching and conduction losses, and high efficiency. Also, the proposed SCC can regulate the output voltage. In addition, switching frequency can be increased as high as possible to increase the converter power density. To confirm the given mathematic analyses, the proposed converter has been simulated to regulate a 400 V output voltage even when wide input voltage (40-60 V) and load (5-266 W) variations are applied.

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