This article proposes a novel step-up interleaved dc-dc converter that is suitable for renewable energy systems. Coupled inductor and built-in transformer voltage multiplier cell are applied to extend the voltage gain while increasing the power density. Hence, the step-up ratio can be adjusted by the turns ratios of the coupled inductor and the built-in transformer. Compared with the other converters with only built-in transformer or only coupled inductor, the combination of these techniques gives an extra degree of freedom to increase the voltage gain. The configuration of the proposed converter not only reduces the current stress through the components, but also the input current ripple is maintained at low values that lengthen the life time of the renewable power source. The energy of the leakage inductors is successfully recycled and the high-voltage spikes across the power switches are avoided, which improves the conversion efficiency. Due to the reduced voltage stress, low-voltage power MOSFETs can be adopted for reduction of conduction losses and cost. The principle operation and steady-state analysis are given to explore the advantages of the proposed converter. Finally, a 1-kW prototype with 45-675 V voltage conversion is built to demonstrate the effectiveness of the proposed converter.

中文翻译：

---

用于可再生能源系统的新型高升压高效交错式 DC__C 转换器，具有耦合电感器和内置变压器


本文提出了一种适用于可再生能源系统的新型升压交错 DC-DC 转换器。采用耦合电感和内置变压器电压倍增器单元，在提高功率密度的同时扩大电压增益。因此，升压比可以通过耦合电感器和内置变压器的匝数比来调节。与其他仅内置变压器或仅耦合电感器的转换器相比，这些技术的组合为增加电压增益提供了额外的自由度。所提出的转换器的配置不仅减少了通过组件的电流应力，而且输入电流纹波保持在较低值，从而延长了可再生电源的使用寿命。漏电感的能量被成功回收，避免了电源开关上的高压尖峰，从而提高了转换效率。由于电压应力降低，可以采用低压功率MOSFET来降低传导损耗和成本。给出了原理工作和稳态分析，以探索所提出的转换器的优点。最后，构建了具有 45-675 V 电压转换功能的 1 kW 原型，以证明所提出的转换器的有效性。