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Coupled Inductor-Based ZVS Interleaved Buck Converter with Optimal Coupling Coefficient and Fully Digital BCM Control

Author

Listed:
  • Jingtao Xu

    (School of Traffic & Transportation Engineering, Central South University, Changsha 410075, China)

  • Xilin Chen

    (School of Traffic & Transportation Engineering, Central South University, Changsha 410075, China)

  • Xiaochao Hou

    (School of Electronic Information, Central South University, Changsha 410075, China)

Abstract

In this paper, a coupled-inductor-based interleaved Buck converter is presented. By employing a negatively coupled inductor, the proposed topology reduces magnetic component number and improves dynamic response. Operating in boundary conduction mode (BCM), the proposed converter can achieve zero-voltage switching (ZVS) under a wide voltage and load range. The control strategy is fully digital, allowing the switching frequency to be adaptively adjusted without the need for a zero-crossing detection (ZCD) circuit. Furthermore, an optimal coupling coefficient design is proposed, which minimizes the frequency adjustment range. In addition, the design process for a coupled inductor with an interleaved winding structure is introduced in detail. Finally, a 300 W experimental prototype is built, the experimental results of which demonstrate its effectiveness and feasibility.

Suggested Citation

  • Jingtao Xu & Xilin Chen & Xiaochao Hou, 2026. "Coupled Inductor-Based ZVS Interleaved Buck Converter with Optimal Coupling Coefficient and Fully Digital BCM Control," Mathematics, MDPI, vol. 14(4), pages 1-19, February.
    • Handle: RePEc:gam:jmathe:v:14:y:2026:i:4:p:643-:d:1863271
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