This paper proposes a novel isolated high step-down conversion circuit, called an integrated buck and modified push-pull (IBMPP) converter, which is able to lower the voltage level on the primary side of the ideal transformer, resulting in a lower turns-ratio and decreased leakage inductance. The IBMPP converter is able to prevent the duty cycle from operating in extremely low conditions. Furthermore, the proposed converter adopts active-clamp techniques to recycle leakage energy and to suppress voltage spikes, so that the conversion efficiency can be effectively improved. The advantages of the IBMPP converter are its simple topology, easy control mechanism (which requires only two signals with a 180-degree phase shift), high conversion ratio, low component counts for power switches, and less voltage stress on some of the switches on the high-voltage side. The operation principle, steady-state analysis, design considerations, and experimental results of the proposed IBMPP converter are presented in detail. The feasibility of the IBMPP is verified by hardware implementation. The full-load efficiency at 250 W is 81.44%, and the input and output voltages are 380 and 5 V, respectively.

中文翻译：

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具有高降压比的集成降压和改进型 Push__ull DC__C 转换器


本文提出了一种新型隔离式高降压转换电路，称为集成降压和改进推挽（IBMPP）转换器，它能够降低理想变压器初级侧的电压电平，从而降低匝数比率并降低漏感。 IBMPP 转换器能够防止占空比在极低的条件下运行。此外，该转换器采用有源钳位技术来回收泄漏能量并抑制电压尖峰，从而可以有效提高转换效率。 IBMPP转换器的优点是拓扑简单、控制机制简单（只需要两个180度相移的信号）、转换比高、功率开关元件数量少、部分开关上的电压应力较小。高压侧。详细介绍了所提出的 IBMPP 转换器的工作原理、稳态分析、设计考虑和实验结果。通过硬件实现验证了IBMPP的可行性。 250 W 时的满载效率为 81.44%，输入和输出电压分别为 380 和 5 V。