A 2−5MHz Multiple DC Output Hybrid Boost Converter with Scalable CR Boosting Scheme Achieving 91% Efficiency at a Conversion Ratio of 12

📋 论文概要

本文提出一种2-5MHz多路直流输出混合升压变换器，采用可扩展的转换比提升方案，解决了传统升压变换器在高转换比下占空比大、开关频率受限、电感电流纹波大及效率低的问题，最终实现91%的效率。

💡 主要创新点

• 提出混合升压拓扑结合可扩展转换比提升方案，突破传统升压变换器在高转换比下的性能瓶颈。
• 实现多路直流输出，适用于智能手机和平板显示器的LED背光应用，同时保持高开关频率和低电感电流纹波。

🏷 关键词

📄 原文摘要

High conversion-ratio (CR) DC-DC boost converters are essential for LED backlighting in smartphone and tablet displays. For realizing a high CR, a conventional boost (CB) converter [1] shown in Fig. 18.7.1 would use a large duty ratio D and thus have short on-time of power switch S2. This not only limits the converter switching frequency fSW but also results in a large inductor current ripple ∆iL. As high CR also leads to a large average inductor current IL under a given output current IO, the power efficiency of the CB converter would be significantly degraded due to enlarged inductor conduction loss with large ∆iL and IL. Hybrid boost converters are recently reported. Both converters in [2,3] add a capacitor path in parallel with the inductor to reduce the inductor current stress, while a two-phase converter in [4] doubles its switching pulse width and fSW through 2-phase operation with 2 inductors. However, compared with the CB converter,

👥 作者与机构

Chen Chen, Jin Liu, Hoi Lee

University of Texas at Dallas, Richardson, TX