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A Novel Quadratic Ultra-High Step-Up DC–DC Converter Based on Coupled Inductor
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DOI：10.1109/tpel.2026.3699459.png)
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Abstract
En 中文
This article proposes a novel high-step-up DC–DC converter featuring continuous input current and a quadratic voltage gain. The converter uses a three winding coupled inductor (TWCI), and a passive clamp circuit to reduce voltage stress across the power switches. Furthermore, the voltage gain is extended by integrating the TWCI's tertiary winding into the output stage alongside a voltage multiplier cell (VMC). By leveraging the leakage inductance of the TWCI, the converter operates in a quasi-resonant operation, resulting in resonant current waveforms for the switches and VMC diodes. This characteristic facilitates true and pseudo zero current switching for these diodes, which eliminates reverse recovery issues and minimizes switching losses. Consequently, the reduced losses and low component stress lead to high overall efficiency. This article presents the converter's steady-state analysis in both continuous conduction mode and discontinuous conduction mode, dynamic modeling, and design considerations. A comprehensive comparison with recently reported high step-up converters demonstrates that the proposed topology provides a superior tradeoff among voltage gain, semiconductor voltage stress, switching device power, power density, and cost. Finally, the analysis is validated by experimental results from 400 V, 226 W prototype, achieving peak efficiency of 96.2% at 200 W.
Keywords:
Clamp circuit
coupled inductor
DC–DC converter
high step-up converter
voltage multiplier (VM)
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6.5
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1.7W
Citations:
8.3W
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