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本文提出了一种用于智能手表的电池充电器，基于仅使用两个飞电容的网状连接连续可调转换比转换器，减少了无效相位和开关及布线电阻，实现了89.2%的效率（16.8W输出）和3.2 W/mm³的功率密度。共享误差放大器方案确保了恒流与恒压模式之间的平滑切换，峰值效率达92%，适用于紧凑型智能手表应用。
Abstract This work presents a battery charger for smartwatches based on a mesh-connected continuously scalable-conversion ratio converter that uses only two flying capacitors. The proposed design reduces the number of invalid phases along with the switch and routing resistance, achieving 89.2% efficiency at a 16.8W output and a power density of 3.2 W/mm3. A shared-error-amplifier scheme ensures a smooth transition between constant current & constant voltage modes. With a peak power conversion efficiency of 92%, this compact and efficient design is well-suited for smartwatch applications. Smart watches, with stringent low-profile requirements, demand compact chargers while allowing slight compromises in power conversion efficiency (PCE). The chargers typically deliver output power (POUT) of ~10W from a 12-V input bus to a Li-ion battery whose voltage ranges from 3.5-to-4.2V during charging [1], corresponding to a required voltage
Yuanfei Wang1, Zhiyuan Zhang1, Yihan Zhang2, Rui P. Martins1, Mo Huang1
University of Macau, Macau, China, 2Hong Kong University of Science and Technology, Hong Kong, China