离线式半桥零电压开关－多谐振变换器（ＺＶＳ－ＭＲＣ）是准谐振开关变换器中的一种最佳拓扑。由于谐振参数多，变换器工作于多种模式，使分析设计较复杂，必须借助计算机仿真。作者提出这种电路轻载工作时存在模式ｖ，分析了这种新的工作模式，并与轻载工作模式Ⅳ进行比较。建立了完整的半桥ＺＶＳ－ＭＲＣ数字仿真模型。实验证实了模式Ｖ的存在。理论分析、仿真计算与实验结果相吻合。 Off-line half-bridge zero-voltage switch - multi-resonant converter (ZVS-MRC) is a quasi-resonant switching converter in the best topology. Due to the large number of resonant parameters, the converter work in a variety of modes, the analysis and design more complex, we must use computer simulation. The author proposes that this circuit has a mode v during light-load operation, analyzes this new mode of operation, and compares it with a light-load mode IV. Established a complete half-bridge ZVS-MRC digital simulation model. Experiments confirmed the existence of pattern V. Theoretical analysis, simulation and experimental results are consistent.