用于移动终端设备的高效率高速Buck-Boost电源管理电路的研究

高效率电源管理电路一直是国际集成电源管理领域的研究热点。同时实现高效率与高速瞬态响应是实现动态电压调整、从应用层优化系统功耗、提升移动终端续航能力的核心技术。本项目从Buck-Boost拓扑的理论效率瓶颈出发，提出新型的利用PFM方式实现Buck + Boost混合拓扑控制、规避低效Buck-Boost拓扑的控制思路，实现整体效率与轻载效率最优化。其次本项目首次提出应用电流模迟滞（Current Mode Hysteretic）控制于Buck-Boost电源的设计思路，使高速迟滞控制Buck-Boost电源成为可能，显著改善现有Buck-Boost电源架构的瞬态响应速度。通过对效率与响应速度两大核心问题的科学研究，实现适用于移动终端设备的新一代高效率高速Buck-Boost电源管理电路。拟实现Buck-Boost峰值效率高于98%，动态电压调整(2.5V至3.3V)1%稳定时间少于3μs。

Highly efficient power management circuit has always been an intensive research area in integrated power management field. High efficiency and fast transient response are key design techniques in achieving dynamic voltage scaling, power optimization from application level, and battery life extension for mobile devices. This project proposes Buck + Boost hybrid control using pulse frequency modulation, thus avoiding the low-efficient buck-boost switching operation and leading to significantly improved overall and light-load efficiency. In addition, this project applies, for the first time, current mode hysteretic control to buck-boost converter, making it possible to achieve an ultra-fast buck-boost power converter. By focusing on the efficiency and transient response, this project targets at high efficiency fast transient response next generation buck-boost integrated power management unit. The expected peak efficiency is higher than 98% and the 1% settling time when output voltage scales between 2.5V and 3.3V is shorter than 3μs.