A 98.3%-Peak-Efficiency Single-Mode Hybrid Buck-Boost Converter with 7mV Maximum Output Ripple for Li-Ion Battery Management

📋 论文概要

本文提出了一种单模式混合降压-升压转换器，用于锂离子电池供电的移动设备，将2.8V至4.2V的电池电压高效转换为稳定的3V输出。该转换器实现了98.3%的峰值效率和仅7mV的最大输出纹波，解决了传统多模式转换器在模式切换时的效率和纹波问题。

💡 主要创新点

• 采用单模式混合拓扑，无需模式切换，简化控制并提高效率。
• 通过优化功率级设计和控制策略，在宽输入电压范围内实现98.3%的峰值效率和7mV低输出纹波。

🏷 关键词

📄 原文摘要

Hefei CLT Microelectronics, Hefei, China 1 2 Hybrid buck-boost converters have been extensively studied for their ability to efficiently convert varying battery voltages (e.g., 2.8V to 4.2V) to a stable mid-3V output in Li-ion battery-powered mobile devices. These converters typically employ either multi-mode or single-mode control as shown in Fig. 9.11.1. Multi-mode buck-boost converters reconfigure the power stage to operate in buck, boost or transition mode based on the battery voltage level (VIN). Compared with the conventional buck-boost converter (CBBC), such hybrid topologies using flying capacitor (CF) reduce the number of power switches or their voltage stress in the current path, thereby lowering the conduction loss. Dual-path techniques can also be employed to further reduce inductor current for efficiency improvement [3]. However, these converters often face mode-transition issues. For example, in [2,3],

👥 作者与机构

Ji Jin1, Ruoshu Yang1, Weiwei Xu2, Lin Cheng1

University of Science and Technology of China, Hefei, China