High Gain Three Port DC-DC Converter

This paper presents the design and analysis of a high-gain non-isolated three-port DC–DC converter for renewable energy applications. The proposed topology integrates a photovoltaic (PV) source, a battery storage system, and a high-voltage DC load within a single power conversion stage. By employing a coupled inductor and switched-capacitor network, the converter achieves a high voltage gain while maintaining reduced voltage stress across semiconductor devices. The converter operates in multiple modes including PV-only operation, battery support mode, dual-input mode, and battery charging mode, ensuring continuous power delivery under varying environmental conditions. The proposed design reduces component count and improves efficiency compared to conventional multi-stage converters. Simulation and hardware validation confirm the effectiveness of the system in achieving high voltage gain, stable output, and efficient energy management.