Modeling and Design of a Zero-Voltage Switching Battery Charger for Photovoltaic Applications

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Abstract
A novel solar-fed quasi-resonant battery charger operating in the Discontinuous Voltage Mode (DVM) is designed and optimized to achieve a high efficiency on a wide range of operating powers. The converter is designed to ensure the Zero Voltage Switching of its MOSFETs on a wide range of operating conditions, thus reducing the switching losses. An analytical model of the converter operation in its two operating modes is provided. A step-by-step design procedure for the converter is proposed for given battery and PV panel specifications. Measurements on a 100W, 12V-output prototype validate the accuracy of the modelling and highlight a high efficiency always above 90.9% with the input voltage ranging from 26.5V and 28.5V and an input power in the wide 20W-100W range.
Funding Information
  • project National Plan for Recovery and Resilience (PNRR)-Next Generation European Union (NGEU) through Italian Ministry of University and Research (DM 352/2022)

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