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该论文提出了一种具有98.6%峰值效率和1.47A/mm²电流密度的Buck-Boost转换器，通过始终降低导通损耗技术，在锂离子电池电压范围内保持高效率。
Hefei CLT Microelectronics, Hefei, China 1 2 Buck-Boost converters are commonly used in the Li-ion battery-powered mobile devices to convert a varying battery voltage (e.g., 2.7V to 4.2V) to a mid-3V output voltage (VOUT) for supplying various function blocks such as RF power amplifiers. To extend the battery life and to meet the increasing loading demands, the converters should maintain a high efficiency throughout the whole range of the battery voltage (VIN) with a high driving capability. In the conventional buck-boost topology [1], there are always two power switches connected to the inductor in the current paths, resulting in a large conduction loss and thus a low efficiency. To reduce the conduction loss, flying-capacitor based topologies that only have one power switch in the current paths are proposed in [2, 3]. However, one of the power switches has to withstand a voltage stress of VIN+VOUT in [2]
Ji Jin1, Yufa Zhou1, Changjin Chen1, Xu Han1, Weiwei Xu2, Lin Cheng1,2
University of Science and Technology of China, Hefei, China