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该论文提出了一种12V/24V转1V的双步降（DSD）电源转换器，通过改进的控制技术实现了56mV的电压跌落和0.9微秒的1%建立时间，以应对3A/20ns的负载瞬态。解决了DSD转换器在快速瞬态响应下的鲁棒控制难题。
12V/24V-to-1V power converters with high efficiency and fast transient responses are highly desirable in industrial and automotive applications. Double step-down (DSD, also known as series-capacitor) converters are among suitable candidates, as they provide 2% duty-cycle extension and 2% equivalent switching frequency with reduced voltage stress on power transistors by adding only one flying capacitor into a two-phase buck converter [1]. However, it is still challenging to robustly control a DSD converter to achieve fast transient responses. Hysteretic control is widely used in the buck converters for its simple structure and fast responses. However, it may not be feasible to apply hysteretic control to a DSD converter as the on times of the two phases must have 180° phase shift and cannot be overlapped. PWM control with fast Type-III compensation [2] is another attractive option, but it suffers from an inherent delay up to half of a switching
Jingyi Yuan, Zeguo Liu, Feng Wu, Lin Cheng
University of Science and Technology of China, Hefei, China