A Single‐Switch Resonant High Voltage Gain DC‐DC Converter Based on Magnetic Coupling

ABSTRACT This paper introduces a single switch high‐step‐up DC‐DC converter designed for photovoltaic energy system applications with the primary purpose of increasing the relatively low output voltage of photovoltaic panels to the DC‐bus voltage of 400 V. The proposed high step‐up converter is centered on a coupled inductor, thereby providing flexibility in the output voltage range, enabling the attainment of higher voltage gain. To recycle the leakage inductance energy, the resonance method is employed. Additionally, the clamped capacitor effectively minimizes voltage stress on the main switch by clamping the capacitor voltage on the switch, thereby alleviating large voltage spikes, resulting in the implementation of a low on‐resistance single switch, leading to simplified switch control, and ultimately enhanced efficiency. By incorporating the non‐isolating approach and hence having a common ground structure, the system's power density is enhanced, and electromagnetic interference (EMI) effects are reduced. A comprehensive and comparative analysis of the steady‐state operation and design of the proposed converter is presented, with detailed examination of its performance metrics and thorough comparison to various existing converter topologies. Experimental results have been obtained from a 25 V/402 V/200 W prototype, validating the correct operation and feasibility of the presented converter.