This paper presents a novel switch current stress reduction technique for a single switch boost-flyback high step up dc–dc converter. Coupled inductor-based converters do not have a sufficiently higher inductance value of their windings. This creates current surge during transient and steady state, which in turn increases current stress at main switch. To compensate this difficulty in coupled inductor-based boost flyback converter, an inductor–diode parallel combination has been connected in series with the switch. This technique increases the effective inductance of the coupled inductor primary winding during switch turn-on operation and helps to reduce current stress. Steady-state operating principle with the proposed technique is analyzed in continuous conduction mode. The current reduction technique is discussed with a proper mathematical derivation. To verify theoretical findings, simulation study is carried out in MATLAB/Simulink R2014b. Finally, a laboratory-based 40-W prototype converter is designed to show the effectiveness of the proposed switch current reduction technique.

中文翻译：

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单开关升压-反激集成高升压DC-DC转换器的新型开关电流应力降低技术

本文介绍了一种用于单开关升压-反激式高升压 dc-dc 转换器的新型开关电流应力降低技术。基于耦合电感的转换器的绕组电感值不够高。这会在瞬态和稳态期间产生电流浪涌，进而增加主开关处的电流应力。为了弥补基于耦合电感的升压反激转换器的这一困难，电感-二极管并联组合已与开关串联。这种技术在开关导通操作期间增加了耦合电感初级绕组的有效电感，并有助于降低电流应力。在连续导通模式下分析了采用所提出技术的稳态工作原理。用适当的数学推导讨论了当前的减少技术。为了验证理论结果，在 MATLAB/Simulink R2014b 中进行了仿真研究。最后，设计了一个基于实验室的 40W 原型转换器来展示所提出的开关电流降低技术的有效性。