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本文提出了一种混合电感型飞电容辅助的升降压DC-DC转换器，解决了锂离子电池电压范围（2.7V-4.2V）下需要同时提供升压和降压功能的问题，实现了96.56%的高效率。
Each mobile device is usually equipped with a Li-ion battery having voltage that varies from a minimum of 2.7V to a maximum of 4.2V. Therefore, as the battery voltage decreases with time, a DC-DC converter is required for a regulated supply lower or higher than the battery voltage. A simple buck converter is not suited for this case, since stepup conversion is not available [1]. Instead, a noninverting buck-boost converter can be a solution over the entire range of the battery voltage [1–4]. Many research studies related to buck-boost converters operated on Li-ion batteries set the target output voltage at around 3.4V [3,4]. Since Li-ion batteries have a wide plateau from 3.6V to 3.8V and a small energy storage below the plateau, DC-DC converters are generally operated on step-down mode at most of the battery voltage range,
Yong-Min Ju, Se-Un Shin, Yeunhee Huh, Sang-Hui Park, Jun-Suk Bang,
Ki-Duk Kim, Sung-Won Choi, Ji-Hun Lee, Gyu-Hyeong Cho KAIST, Daejeon, Korea The number of mobile device users increases every year