变频控制是谐振功率变换器常用的调控手段，但是宽范围变化的工作频率会降低磁性元器件的性能且增加设计复杂性． 文中提出一组基于可控开关电容( SCC) 控制的谐振功率变换器，通过改变谐振回路的等效电容可以在恒定工作频率下完成谐振变换器的输出调控． 对各种不同SCC 拓扑进行了分析比较，论证了所提出SCC 结构的优越性． 然后枚举了SCC 结构在二阶和三阶谐振变换器中的应用，并详细分析了一种基于半桥移相控制的SCC-LCL-T 型谐振变换器的工作特性． 最后，通过仿真和实验验证了所提出的SCC 结构应用于谐振变换器拓扑的有效性和可行性．

At present,the most effective control of resonant converters is the frequency modulation,but the wide variation range of working frequencies can reduce the performance of magnetic components and increase the design complexity.In this paper,a set of resonant converters based on controllable switched capacitors ( SCC) is proposed,which can effectively control the output of resonant converters at a constant frequency by adjusting the equivalent capacitance of resonant tanks.The superiority of the proposed SCC structure is demonstrated by analyzing and comparing different SCC topologies.Then,second-order and third-order resonant converters are combined with the proposed SCC structure,and the characteristic of a new SCC-LCL-T resonant converter topology based on the half-bridge phase-shift control is discussed in detail.Finally,the feasibility and effectiveness of the proposed SCC structure are verified by simulation and experiments.