A novel hybrid half-bridge LLC resonant converter with double resonant tanks for high step-down applications,International Journal of Circuit Theory and Applications

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A novel hybrid half-bridge LLC resonant converter with double resonant tanks for high step-down applications
International Journal of Circuit Theory and Applications ( IF 1.8 ) Pub Date : 2022-09-20 , DOI: 10.1002/cta.3419
Song Lu ₁ , Hongbo Ma ₁ , Junhong Yi ₁ , Xiaobin Li ₁ , Jian Li ₁

Affiliation

Conventional half-bridge (HB) LLC converters have been a good candidate for the first stage in the two-stage conversion structure because of its high conversion efficiency and high frequency operation ability. However, the voltage gain is only 0.5 exclusive of the transformer, resulting in the reduced efficiency for high step-down applications. In order to solve this issue, in this paper, a novel hybrid HB LLC converter with double resonant tanks is firstly presented for high step-down ratio applications. The distinctive features of the proposed converter are as follows: (1) the voltage gain of 0.25 is achieved by incorporating the switched capacitor circuit. Thus, the primary turns number for the transformer is halved compared with conventional HB LLC converters. Correspondingly, the smaller primary side winding losses and transformer volume can be implemented. (2) The power splitting and low input current ripple can be obtained due to the employed double resonant tanks. Thus, the uniform thermal distribution and low input filter capacitance are the second advantage for the proposed converter. (3) Soft switching over the entire operation range still can be maintained with larger magnetics inductance. The detailed operation principles, circuit analysis, and resonant tank design for the proposed converter are introduced and presented. A hardware prototype with 36–60 V input, 3 V/50 A-output is built to demonstrate the declared features of the proposed hybrid converter.

中文翻译：

一种用于高降压应用的具有双谐振回路的新型混合半桥 LLC 谐振转换器

传统的半桥 (HB) LLC 转换器因其高转换效率和高频工作能力而成为两级转换结构中第一级的理想选择。然而，电压增益只有 0.5（不包括变压器），导致高降压应用的效率降低。为了解决这个问题，本文首先针对高降压比应用提出了一种带有双谐振回路的新型混合 HB LLC 转换器。所提出的转换器的显着特点如下：(1) 0.25 的电压增益是通过结合开关电容电路实现的。因此，与传统的 HB LLC 转换器相比，变压器的初级匝数减少了一半。相应地，可以实现更小的初级侧绕组损耗和变压器体积。(2) 由于采用了双谐振回路，可以获得功率分配和低输入电流纹波。因此，均匀的热分布和低输入滤波电容是所提出转换器的第二个优势。(3) 在整个工作范围内的软切换仍然可以在较大的磁感下保持。介绍并介绍了所提出转换器的详细工作原理、电路分析和谐振回路设计。构建了具有 36–60 V 输入、3 V/50 A 输出的硬件原型，以演示所提出的混合转换器的声明特性。均匀的热分布和低输入滤波电容是所提出转换器的第二个优势。(3) 在整个工作范围内的软切换仍然可以在较大的磁感下保持。介绍并介绍了所提出转换器的详细工作原理、电路分析和谐振回路设计。构建了具有 36–60 V 输入、3 V/50 A 输出的硬件原型，以演示所提出的混合转换器的声明特性。均匀的热分布和低输入滤波电容是所提出转换器的第二个优势。(3) 在整个工作范围内的软切换仍然可以在较大的磁感下保持。介绍并介绍了所提出转换器的详细工作原理、电路分析和谐振回路设计。构建了具有 36–60 V 输入、3 V/50 A 输出的硬件原型，以演示所提出的混合转换器的声明特性。

更新日期：2022-09-20

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