In this article, an LLC converter using gallium nitride (GaN) transistors is proposed for a 48-V regulated and isolated bus converter. Compared with pulsewidth modulation (PWM)-based topologies, the soft switching capability of an LLC allows operation at very high frequencies. In addition, the size of the magnetic components is reduced without sacrificing the efficiency. In this article, a novel magnetic structure that integrates a matrix transformer and inductor with minimum winding and a single magnetic core is proposed, to allow a high-density and high-efficiency LLC converter design for a bus converter. A 40-60-V input and regulated 12-V output converter is developed to deliver a 1-kW output power in a quarter brick form factor. The designed converter can achieve a power density of 700 W/in ³ with a maximum efficiency of 97.82% at half-load, dropping to 97.7% at full-load operation.

中文翻译：

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低损耗集成电感器和变压器的结构及其在48V总线转换器的稳压LLC转换器中的应用

在本文中，提出了一种使用氮化镓（GaN）晶体管的LLC转换器用于48V稳压和隔离总线转换器。与基于脉冲宽度调制（PWM）的拓扑相比，LLC的软开关功能允许在很高的频率下工作。另外，在不牺牲效率的情况下减小了磁性部件的尺寸。在本文中，提出了一种新颖的磁性结构，该结构将矩阵变压器和电感器与最少的绕组和单个磁芯集成在一起，以实现总线转换器的高密度和高效率LLC转换器设计。开发了40-60V输入和稳压12V输出转换器，以四分之一砖的外形尺寸提供了1kW的输出功率。设计的转换器可以实现700 W / in的功率密度 ³ 半载时的最高效率为97.82％，满载时的效率降至97.7％。