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Large Step-down Dc-dc Converters With Reduced Current Stress

机译：减小电流应力的大型降压型DC-DC转换器

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摘要

In this paper, several DC-DC converters with large voltage step-down ratios are introduced. A simple modification in the output section of the conventional buck and quadratic converters can effectively extend the duty-cycle range. Only two additional components (an inductor and diode) are necessary for extending the duty-cycle range. The topologies presented in this paper show an improvement in the duty-cycle (about 40%) over the conventional buck and quadratic converters. Consequently, they are well suited for extreme step-down voltage conversion ratio applications. With extended duty-cycle, the current stress on all components is reduced, leading to a significant improvement of the system losses. The principle of operation, theoretical analysis, and comparison of circuit performances with other step-down converters is discussed regarding voltage and current stress. Experimental results of one prototype rated 40-W and operating at 100 kHz are provided in this paper to verify the performance of this new family of converters. The efficiency of the proposed converters is higher than the quadratic converters.
机译：本文介绍了几种具有大降压比的DC-DC转换器。对传统降压和二次转换器的输出部分进行简单的修改就可以有效地扩展占空比范围。扩展占空比范围仅需要两个附加组件（电感器和二极管）。本文介绍的拓扑结构表明，与传统的降压和二次转换器相比，占空比得到了改善（约40％）。因此，它们非常适合极端降压转换比应用。随着占空比的延长，所有组件上的电流应力得以降低，从而显着改善了系统损耗。关于电压和电流应力，讨论了工作原理，理论分析以及与其他降压转换器的电路性能比较。本文提供了一个额定功率为40 W且工作频率为100 kHz的原型的实验结果，以验证该新系列转换器的性能。所提出的转换器的效率高于二次转换器。

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