A Novel Ultra‐High Gain Quadratic DC–DC Converter Based on Improved Sepic Structure

Abstract

This article proposes a high‐gain quadratic DC–DC converter derived from the improved Sepic structure. By integrating a voltage multiplier cell, a coupled inductor, and a new quadratic voltage‐boosting stage, the design provides ultra‐high and adaptable voltage conversion ratios, resulting in significantly enhanced gain capability. Despite the substantial increase in voltage gain, the design maintains low voltage stress on the components. Passive clamping circuits are incorporated for both switching transistors, which effectively suppress voltage spikes by recycling the energy stored in the leakage inductance. Furthermore, the inclusion of a single input inductor ensures a continuous input current. Additional advantages of the proposed topology encompass reduced voltage stress across the semiconductor devices and a nonisolated, common‐ground configuration. These features enhance its suitability for renewable energy integration. A comprehensive examination is provided, covering detailed steady‐state analysis, a parameter design guideline, and a loss analysis. The effectiveness of the converter is validated through a 200 W experimental prototype, delivering an output voltage of 400 V. This prototype demonstrates a peak full‐load efficiency of 95.41%, thereby confirming the topology's superior performance in energy conversion systems.