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In order to maintain the high efficiency operation of the LLC resonant converter, the LLC resonant converter usually works near the resonant frequency, which makes the converter gain range narrow. To address this problem, this paper proposes a topology of primary-side Buck-LLC cascade converter and secondary-side special full-bridge rectifier, which is capable of realizing a wide range of voltage gains. The primary side of this topology adopts a synergistic control strategy of the front-stage Buck unit control and the back-stage LLC resonant converter, Namely, the front-stage realizes the closed-loop voltage stabilization function by PWM modulation, and the back-stage adopts the open-loop of the LLC to work at the point of resonance frequency. The overlapping conduction control method is introduced at the vice-side, and the voltage gain is adjusted by adjusting the overlapping duty cycle of the rectifier bridge switching tubes, so that the system can automatically switch the operation mode according to the output voltage, and the system can realize a 3-fold gain extension range. Theoretical derivation shows that all switching tubes of the system realize soft switching in a wide gain range. Combined with the state plane trajectory diagram, the voltage gain equation and soft-switching boundary conditions are derived. To validate the proposed scheme, an experimental prototype with DC300 V input and DC20-60 V/500 W output is built, and the experimental results and analysis verify the correctness and effectiveness of the system topology and control strategy.

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为保持LLC谐振变换器高效率运行，LLC谐振变换器通常工作在谐振频率附近，使得变换器增益范围较窄。针对该问题，本文提出一种原边Buck-LLC级联变换器和副边特殊全桥整流的拓扑结构，该拓扑结构能实现宽范围电压增益。该拓扑结构原边采用前级Buck单元控制与后级LLC谐振变换器的协同控制策略，即前级通过PWM调制实现闭环稳压功能，后级采用LLC开环工作在谐振频率点。在副边引入交叠导通控制方式，通过调节整流桥开关管的交叠占空比来调整电压增益，使系统能够根据输出电压自动切换运行模式，系统可实现3倍增益扩展范围。理论推导表明，系统所有开关管在宽增益范围内均实现软开关。结合状态平面轨迹图，推导了电压增益方程及软开关边界条件。为验证所提方案，搭建了一台DC300 V输入、DC20-60 V/500 W输出的实验样机，实验结果及分析验证了系统拓扑结构和控制策略的正确性和有效性。

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赵冬冬，硕士研究生，主要研究方向为电力电子与电气传动、LLC谐振变换器的拓扑结构及控制策略。E-mail: 484641458@qq.com

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赵冬冬，硕士研究生，主要研究方向为电力电子与电气传动、LLC谐振变换器的拓扑结构及控制策略。E-mail: 484641458@qq.com

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王福豪，硕士研究生，主要研究方向为电力电子与电力传动，LLC谐振变换器的拓扑结构。E-mail: 2634189204@qq.com

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王福豪，硕士研究生，主要研究方向为电力电子与电力传动，LLC谐振变换器的拓扑结构。E-mail: 2634189204@qq.com

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