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In a photovoltaic system, its power output is heavily reliant to the irradiance instantaneously and this make the efficiency of DC/DC converter using in the photovoltaic system reduces, especially during low irradiance period. This paper proposes a new DC/DC converter to improve the efficiency of a PV system. The main idea of the new DC/DC converter is developed a DC/DC converter with variable capacity to meet the variation in the output power of the photovoltaic system. The designed converter is combined from multi-small DC/DC converters to obtain a high enough capacity and these small DC/DC converters are able to switch on/off to change the percentage of power flowing through such as the power loss in small DC/DC converter is reduced. This designed converter is verified via experiment shoots. The results indicate that the efficiency of proposed converter is higher than that with a conventional DC/DC converter.

A New Design of DC/DC Converter to Improve the Efficiency of Photovoltaic System