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首页> 外文期刊>Power Electronics, IET >Soft-switched non-isolated high step-up DC–DC converter with reduced voltage stress
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Soft-switched non-isolated high step-up DC–DC converter with reduced voltage stress

机译：具有降低电压应力的软开关非隔离式高升压DC-DC转换器

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摘要

In this study, a novel soft-switched high step-up DC/DC converter is presented. This converter is suitable to be employed in photovoltaic and fuel cell systems. The proposed topology is based on coupled inductors and switched-capacitor techniques to provide high step-up gain. Also, due to high conversion ratio, and symmetrical structure of the proposed topology, the voltage stress of semiconductor elements is low; therefore, high performance metal–oxide–semiconductor field-effect transistors with low ON-resistance, and also low-voltage rating diodes can be utilised to reduce the circuit cost, conduction, and reverse-recovery losses which improve the converter efficiency and power density. Furthermore, by adopting an active clamp circuit, the stored energy in the leakage inductance of coupled inductors is recycled and zero-voltage-switching turn-on condition for both main and clamp switches are provided. Operating principle and steady-state analysis of the converter are discussed in detail. Finally, an experimental prototype of the proposed converter with 200 W output power is implemented which verifies the theoretical analysis.
机译：在这项研究中，提出了一种新颖的软开关高升压DC / DC转换器。该转换器适用于光伏和燃料电池系统。拟议的拓扑基于耦合电感器和开关电容器技术，以提供较高的升压增益。而且，由于高的转换率和所提出的拓扑结构的对称性，半导体元件的电压应力很低。因此，可以使用具有低导通电阻的高性能金属氧化物半导体场效应晶体管以及低额定电压二极管来降低电路成本，传导和反向恢复损耗，从而提高转换器效率和功率密度。此外，通过采用有源钳位电路，可回收耦合电感器漏电感中存储的能量，并为主开关和钳位开关提供零电压开关导通条件。详细讨论了转换器的工作原理和稳态分析。最后，实现了所提出的具有200 W输出功率的转换器的实验原型，该原型验证了理论分析。

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