A new non-isolated high-gain high-efficiency interleaved DC–DC converter with low voltage stress is introduced in this paper, which is suitable for renewable energy sources applications. It utilizes coupled inductor (CI) and built-in transformer (BIT) to achieve an ultra-step-up voltage ratio. In such a case, a more flexible voltage gain is provided through the turn ratios of CI and BIT. Through the interleaving effect, the input current ripple is minimized and also equal current sharing performance is realized between the interleaved phases. Moreover, the implementation of low voltage MOSFETs is facilitated by reducing the voltage stress across which consequently decreases the conduction losses. Meanwhile, the leakage inductances of the magnetic devices provide zero current switching of the semiconductors, and reverse recovery losses of diodes are diminished, as well. Finally, a 1 kW 20–400 V prototype is fabricated to examine the conducted steady-state analysis and to demonstrate the merits of the proposed converter.

本文介绍了一种新型低电压应力非隔离高增益高效率交错式DC-DC转换器，适用于可再生能源应用。它利用耦合电感器 (CI) 和内置变压器 (BIT) 来实现超升压比。在这种情况下，可以通过CI和BIT的匝数比来提供更灵活的电压增益。通过交错效应，输入电流纹波被最小化，并且在交错相之间实现相等的均流性能。此外，通过降低电压应力可以促进低压 MOSFET 的实现，从而降低传导损耗。同时，磁性器件的漏感提供了半导体的零电流开关，并且二极管的反向恢复损耗也被减小。最后，制造了一个 1 kW 20-400 V 原型来检查进行的稳态分析并证明所提出的转换器的优点。