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S-Hybrid Step-Down DC-DC Converter-Analysis of Operation and Design Considerations
IEEE Transactions on Industrial Electronics ( IF 7.7 ) Pub Date : 2020-01-01 , DOI: 10.1109/tie.2019.2897537
Gab-Su Seo , Hanh-Phuc Le

This paper presents a new highly integrable hybrid step-down converter that merges switched-inductor and switched-capacitor operations and significantly reduces onboard loss by using the input cable's parasitic inductance as its main inductor. This converter has the inductor placed at the input with a smaller voltage swing, leading to possible use of a smaller inductor and low-voltage rating switches that generally translate to reduced conduction losses. Analyses of converter operation and losses to reveal its original characteristics and design guidelines are presented to facilitate the components optimization. The converter architecture is verified by a proof-of-concept 15-W inductor-less lithium-ion battery charger prototype that uses a 1-m USB 3.0 cable as inductor. The converter, switched at 2 MHz from a 5-V input, experimentally achieves 89.7% peak efficiency and 6% higher efficiency at full load than a Buck converter counterpart. This high efficiency and zero onboard inductor yield a relative 45.7% onboard loss reduction at full load, promising excellent integration feasibility and superior system thermal management.

中文翻译:

S-Hybrid 降压型 DC-DC 转换器 - 操作和设计考虑分析

本文介绍了一种新的高度集成的混合降压转换器,该转换器融合了开关电感和开关电容操作,并通过使用输入电缆的寄生电感作为其主电感来显着降低板上损耗。该转换器将电感器放置在电压摆幅较小的输入端,从而可以使用较小的电感器和低电压额定开关,这通常会降低传导损耗。提供了转换器运行和损耗分析以揭示其原始特性和设计指南,以促进组件优化。转换器架构通过概念验证的 15W 无电感锂离子电池充电器原型进行验证,该原型使用 1 米 USB 3.0 电缆作为电感。转换器从 5V 输入以 2MHz 的频率切换,实验上比降压转换器实现了 89.7% 的峰值效率和 6% 的满载效率。这种高效率和零板载电感器在满载时相对减少了 45.7% 的板载损耗,保证了出色的集成可行性和卓越的系统热管理。
更新日期:2020-01-01
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