In this study, a new zero voltage switching (ZVS) synchronous buck converter with ultra-high step-down conversion ratio is introduced. By combining coupled inductors and energy-transferring capacitors, operating duty cycle is significantly extended while the voltage stress across the switches is reduced. Thereby, extremely low voltage gain can be achieved and the conduction loss is reduced owing to using switches with lower voltage rating. Also, by applying the interleaved method and complementary pulses for switches, the current stress and the output current ripple are reduced. In the proposed converter, soft switching condition is achieved for all switches without any auxiliary circuit. As a result, the overall efficiency of the introduced converter is improved. The converter operation and its design considerations are discussed. Experimental results are presented to validate the theoretical analysis.

中文翻译：

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具有低开关电压应力的超高降压ZVS同步降压转换器

在这项研究中，介绍了一种新型的具有超高降压转换比的零电压开关（ZVS）同步降压转换器。通过组合耦合的电感器和能量传输电容器，可大大延长工作占空比，同时减小开关两端的电压应力。因此，由于使用了额定电压较低的开关，因此可以实现极低的电压增益，并降低了传导损耗。而且，通过将交错方法和互补脉冲应用于开关，可以减小电流应力和输出电流纹波。在所提出的转换器中，对于没有任何辅助电路的所有开关都实现了软开关条件。结果，提高了引入的转换器的整体效率。讨论了转换器的操作及其设计注意事项。