High‐gain combined buck‐boost‐Cuk converter with coupled inductance

Abstract This article proposes a current step‐up converter for high‐gain applications by combining a buck‐boost converter and a Cuk converter to form a buck‐boost‐Cuk converter with a shared input terminal. In order to further improve the performance of the converter and reduce the number of components, the primary side and secondary side of the coupled inductor are respectively connected to different branches, so that the diode‐capacitor branch in this structure could be used as a voltage doubler branch, and performed as a passive clamp circuit to absorb leakage inductance energy, which suppressed the voltage spike generated by the parasitic capacitance and the leakage inductance of the resonance; to some extent, it reduced the voltage stress of the power switch. This paper analyzed the operating principle and performance of the converter, then made the parameter design for the proposed converter, and compared the performance of different converter systems. At last, this paper built a 150 W experimental prototype to verify the correctness of the theoretical analysis.