Hybrid Resonant and Non-Resonant Coupled-Inductor-Based Current-Fed DC–DC Converter

IF 5 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC
Armin Miremad;Suzan Eren
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引用次数: 0

Abstract

This article presents a hybrid resonant and non-resonant coupled-inductor-based current-fed DC-DC converter, designed for solar-tile microinverter (MI) applications requiring high voltage gain. In the proposed circuit, a boost half-bridge (BHB) is connected to the PV side, providing higher voltage for the half-bridge stage and reducing the primary conduction losses. Additionally, an active voltage-doubler rectifier is utilized on the secondary-side to achieve a two-fold voltage gain, thereby reducing the required transformer turns ratio and size. The proposed circuit is derived by integrating the input dc inductor of the BHB into a coupled-inductor, introducing an additional resonant path that enhances power transfer capacity without requiring extra active switches. The introduction of the resonant path contributes to narrow the switching-frequency range, reduce the turn-off current and switching losses, and improve the efficiency while increasing the power transfer capability compared to the non-resonant configurations. The design procedure is presented to minimize current stress, extend ZVS range, and reduce reverse input current. The ZVS regions for primary and secondary switches are determined under different load conditions and voltage gains. Two control parameters, phase-shift and switching frequency, emerges due to the active rectifier and the resonant coupled-inductor, providing more flexibility in regulating output power, minimizing back-flow power, and maintaining ZVS across all switches. Experimental results provided from a 100 W prototype, to validate the performance of the proposed converter.
基于混合谐振和非谐振耦合电感的电流型DC-DC变换器
本文介绍了一种基于混合谐振和非谐振耦合电感的电流馈电DC-DC变换器,专为需要高电压增益的太阳能瓦片微型逆变器(MI)应用而设计。在所提出的电路中,一个升压半桥(BHB)连接到PV侧,为半桥级提供更高的电压,并减少一次传导损失。此外,在二次侧利用有源倍压整流器实现两倍电压增益,从而减少所需的变压器匝数比和尺寸。所提出的电路是通过将BHB的输入直流电感集成到耦合电感中,引入额外的谐振路径来增强功率传输能力,而不需要额外的有源开关。谐振路径的引入有助于缩小开关频率范围,减少关断电流和开关损耗,提高效率,同时增加功率传输能力。提出了减小电流应力、扩展ZVS范围和减小反向输入电流的设计方法。在不同的负载条件和电压增益下,确定了一次和二次开关的ZVS区域。由于有源整流器和谐振耦合电感,出现了两个控制参数,相移和开关频率,在调节输出功率,最小化回流功率和保持所有开关的ZVS方面提供了更大的灵活性。通过一个100w样机的实验结果,验证了所提出的变换器的性能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
8.60
自引率
0.00%
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0
审稿时长
8 weeks
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