Bi-Extending Coupled-Inductor Based High Gain Converter for Integrated PV Applications

This paper presents a non-isolated high-gain DC–DC converter utilizing a parallel-charged cumulative-discharge boost configuration with a 1:1 coupled inductor for photovoltaic (PV) panel integration with a 48V DC-bus. The proposed operating principle enables parallel inductor energization and series energy transfer enables a high voltage gain at a reduced duty ratio. For a 48V output, the converter operates at 29.2% duty ratio while limiting switch voltage stress to 36V. A quasi-distributed air-gap magnetic design is adopted to mitigate fringing-related proximity losses. A 200W, 50Hz prototype achieves 95.8% peak efficiency and stable MPPT under varying irradiance and partial shading conditions.