Power converters with higher efficiency in a wide load range are important for reducing the overall energy consumption of renewable energy generation systems. A center-tapped LC series resonant dual-active bridge (LC-DAB) converter for DC-DC conversion is proposed in this paper. The proposed converter utilizes a center-tapped bridge to block reverse current and eliminate back flow power to reduce conduction losses. Two modulation methods for the proposed topology (i.e., fixed frequency modulation (FFM), and variable frequency modulation (VFM)) are proposed and analyzed. Both modulation methods can realize soft switch over the entire load range to reduce switching losses. In addition, the proposed modulation techniques guarantee soft switching for all devices and synchronous rectifier is realized by the center-tapped bridge to further reduce the conduction losses. Furthermore, a comprehensive comparison in terms of conduction losses and switching losses has been carried out to highlight the superiority of the proposed converter over the existing LC resonant converters. Finally, simulated and experimental results for a $1.5$ kW prototype are presented to validate the theoretical analysis and performance of the proposed converter.

中文翻译：

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具有两种调制技术的DC-DC中心抽头谐振双有源桥

在宽负载范围内具有更高效率的功率转换器对于降低可再生能源发电系统的总体能耗至关重要。提出了一种用于DC-DC转换的中心抽头LC串联谐振双有源桥（LC-DAB）转换器。拟议的转换器利用中心抽头桥来阻止反向电流并消除回流功率以减少传导损耗。提出并分析了提出的拓扑的两种调制方法（即固定频率调制（FFM）和可变频率调制（VFM））。两种调制方法都可以在整个负载范围内实现软开关，以减少开关损耗。此外，提出的调制技术保证了所有设备的软开关，并且通过中心抽头桥实现了同步整流器，从而进一步降低了传导损耗。此外，已经进行了传导损耗和开关损耗方面的全面比较，以突出所提出的转换器优于现有LC谐振转换器的优势。最后，模拟和实验结果$\mathrm{1个}。5$ 提出了kW原型，以验证所提出的转换器的理论分析和性能。