【摘要】 在当今多元化的应用场景中，LLC谐振变换器因其高效的工作特性，在诸多领域得到了广泛应用。然而，传统LLC谐振变换器在宽增益范围场景应用时，面临着开关频率范围与总体效率之间难以调和的矛盾。为有效解决这一关键问题，本文通过重构拓扑提出一种基于多模态切换的三通道LLC谐振变换器。该变换器通过控制原边全桥与半桥切换、副边桥式与倍压整流切换，构造出三通道5种工作模式，覆盖5种不同增益范围，从而在窄频范围内实现超宽输出电压。这种设计不仅提升了变换器的效率，并通过复用开关器件，有效降低了成本。为了验证所提出拓扑及控制策略的可行性，本文设计并搭建一台输出电压范围为50～400 V、最大功率达400 W的实验样机。实验结果验证该变换器能够实现8倍超宽电压增益范围，同时也能够实现各模态之间平滑切换，展现出优异的性能和应用潜力。更多还原

【Abstract】 In diverse applications, LLC resonant converters are widely used for high efficiency. However, traditional LLC topologies face an irreconcilable trade-off between switching frequency range and overall efficiency in wide-gain scenarios. To address this key issue, a three-channel LLC resonant converter with multi-mode switching was proposed via topology reconstruction. By controlling primary full-bridge/half-bridge switching and secondary bridge/voltage-doubler rectification, five operating modes covering five gain ranges were configured, enabling ultra-wide output voltage within a narrow frequency band. Efficiency is improved and cost is effectively reduced through switching device reuse. An experimental prototype(50-400 V output, 400 W maximum power) was constructed to verify the proposed topology and control strategy. Experimental results confirm an 8x ultra-wide voltage gain range and smooth mode switching, demonstrating excellent performance and application potential.更多还原