An L2C2 Resonant Converter With Reduced Components and Wide Gain Range

This letter proposes an L2C2 resonant converter that offers an extended gain range, addressing the gain limitations of the widely adopted LLC converter. Compared to other wide-gain-range resonant converters, the proposed topology requires only one additional resonant capacitor beyond the LLC converter, resulting in lower cost, higher reliability, and improved efficiency. The proposed topology exhibits a unique characteristic that a larger magnetizing inductance leads to a wider gain range. As a result, increased magnetizing inductance contributes to both higher efficiency and broader gain adaptability. The operation and effectiveness of the proposed converter are validated through an experimental prototype achieving a peak efficiency of 96.5% with an output voltage range from 24 V to 120 V.