This study proposed a dual-output AC–DC converter based on three-port bridgeless power factor corrector (TPB-PFC) and a non-isolated resonant DC-transformer (Ni-DCX) for dual-output DC voltage applications. A constant DC output voltage and a variable DC output voltage are provided simultaneously by the proposed AC–DC converter. Based on the TPB-PFC converter, a stacked power conversion structure with reduced power conversion stage is presented. Therefore, lower power losses and higher efficiencies are achieved. Meanwhile, soft switching of all the power devices in the Ni-DCX is achieved with open-loop controlled and optimised operation of the Ni-DCX, resulting in easy control and higher efficiency. In addition, switching losses of the TPB-PFC are reduced thanks to the three-level characteristic. Operation principles and characteristics of both TPB-PFC and Ni-DCX converter, and modulation and control strategies of the proposed AC–DC converter are analysed in detail. Feasibility and effectiveness of the proposed solutions are verified experimentally with a 2 kW dual-output AC–DC prototype.

中文翻译：

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具有三端口无桥PFC和非隔离DCX的双输出AC-DC转换器

这项研究提出了一种基于三端口无桥功率因数校正器（TPB-PFC）和非隔离谐振DC变压器（Ni-DCX）的双输出AC-DC转换器，用于双输出DC电压应用。提出的AC-DC转换器同时提供恒定的DC输出电压和可变的DC输出电压。基于TPB-PFC转换器，提出了一种具有减少功率转换级的堆叠式功率转换结构。因此，实现了更低的功率损耗和更高的效率。同时，通过Ni-DCX的开环控制和优化操作，实现了Ni-DCX中所有功率器件的软切换，从而实现了轻松控制和更高的效率。此外，由于具有三级特性，TPB-PFC的开关损耗得以降低。详细分析了TPB-PFC和Ni-DCX转换器的工作原理和特性，以及所提出的AC-DC转换器的调制和控制策略。提出的解决方案的可行性和有效性已通过2 kW双输出AC-DC原型进行了实验验证。