A high step-up coupled-inductor single-ended primary-inductor converter (SEPIC) DC–DC converter with input current ripple cancellation is presented in this study. The proposed converter is based on the structure of a SEPIC but also has a coupled inductor. In the proposed converter, two coupled inductors are used to increase the voltage gain and remove the input current ripple. The voltages of the main switch and all diodes are clamped to prevent high-voltage surges caused by the leakage inductance of the coupled inductor. Hence, a dissipative snubber circuit or an active clamping circuit is not required. As a result of the reduction of voltage stress, a MOSFET with low drain-to-source on-state resistance R_DS(ON) can be used as the main switch. To demonstrate the performance of the proposed converter, a prototype converter with an input voltage of 24 V, an output voltage of 300 V, and output power of 100 W is implemented.

本研究提出了一种具有输入电流纹波消除功能的高升压耦合电感单端初级电感转换器 (SEPIC) DC-DC 转换器。所提出的转换器基于 SEPIC 的结构，但也有一个耦合电感器。在所提出的转换器中，使用两个耦合电感器来增加电压增益并消除输入电流纹波。主开关和所有二极管的电压被钳位，以防止由耦合电感的漏感引起的高压浪涌。因此，不需要耗散缓冲电路或有源钳位电路。由于电压应力的降低，具有低漏源导通电阻R _{DS(ON)的 MOSFET}可用作主开关。为了演示所提出转换器的性能，实现了一个输入电压为 24 V、输出电压为 300 V、输出功率为 100 W 的原型转换器。