A High Voltage Gain Single‐Switch Converter With Soft‐Switching and EMI Mitigation

In this study, a high step‐up DC–DC conversion topology incorporating soft‐switching behavior is introduced. The proposed structure employs a combination of coupled‐inductor boosting and switched‐capacitor enhancement to achieve a substantial increase in voltage gain. A passive energy‐recovery clamp is integrated into the design to alleviate the negative effects of leakage inductance and recycle the stored energy. By adopting this configuration, the main switch naturally satisfies soft‐switching requirements, achieving zero‐current switching at turn‐on and zero‐voltage switching at turn‐off, which significantly minimizes switching losses and improves overall efficiency. The converter uses only a single active semiconductor device along with one magnetic core, resulting in a compact and economically attractive solution. Additionally, the input and output terminals share a common ground, improving system‐level compatibility and simplifying implementation. Grounding the switch source further reduces the complexity of the gate‐drive circuitry. To substantiate the analytical evaluation, a 200‐W prototype was constructed and tested, demonstrating the practical viability of the proposed converter. The experimental results reveal a maximum efficiency of 95.6% at full load, while maintaining conducted EMI levels below 59 dB μ V, thereby meeting the CISPR 22 Class B requirements.