ABSTRACT

This paper proposes a new Non-Isolated Interleaved (NII) high step-up gain DC-DC converter. This new topology aimed for high power applications, which achieves high step-up voltage gain without a high turns ratio n and a high duty cycle. This converter comprised of two-phase interleaved Coupled-Inductors (CIs) integrated with voltage multiplier rectifier and switched capacitor. The key feature of this converter is very low voltage stress on switching devices compares to existing NII high step-up gain topologies for the similar gain. The reduced rating allows the use of low-voltage rating power devices. Besides, the presented converter inherently recycles the leakage energy, and do not require an auxiliary clamp circuit. In addition, the switching operation is free from the reverse recovery problem due to the zero-current-switching. The working principle and performance characteristics of the converter are presented in detail. The analytical study of effect of parasitic parameters on voltage gain and efficiency of this converter is also presented. The performance comparisons with existing NII high step-up gain topologies are provided to highlight the merits of the converter. To verify the correctness of the theoretical analysis, the experimental setup of 300 W is built. The experiments are conducted to boost 24 V–380 V with turns ratio n = 1, and to boost 24 V–580 V with n = 2.

摘要

本文提出了一种新的非隔离交错 (NII) 高升压增益 DC-DC 转换器。这种针对高功率应用的新拓扑结构可实现高升压电压增益，而无需高匝数比n和高占空比。该转换器由两相交错耦合电感器 (CI) 组成，集成了电压倍增器整流器和开关电容器。与现有的 NII 高升压增益拓扑相似的增益相比，该转换器的关键特性是开关器件上的电压应力非常低。降低的额定值允许使用低压额定功率器件。此外，所提出的转换器固有地回收泄漏能量，并且不需要辅助钳位电路。此外，由于零电流开关，开关操作没有反向恢复问题。详细介绍了转换器的工作原理和性能特点。还对寄生参数对该转换器电压增益和效率的影响进行了分析研究。提供与现有 NII 高升压增益拓扑的性能比较，以突出转换器的优点。为验证理论分析的正确性，搭建了300 W的实验装置。进行实验以提高 24 V–380 V 的匝数比n = 1，并在n = 2时提升 24 V–580 V。