一种混合高降压比DC/DC变换器设计与研究

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中图分类号：TM46 文献标志码：A 文章编号：2095-8188（2025）05-0063-05

DOI：10.16628/j. cnki.2095-8188.2025.05.009

Abstract：The switching capacitor step-down topology has theadvantages of high eficiency，no need for inductors，and smallsize.By being connected in series witha Buck converter，it can achievea high step-downratio constant voltage output.The working principleof this cascaded topologyisanalyzed.Under thesame operating frequency，byreusing theswitching tubes，the number ofswitching devices canbe further reduced to forma hybrid step-down topology structure andachieve the miniaturization of the converter. The proposed topology can significantly increase the duty cycleof thestep-down circuit and issuitableforthehigh step-downratioapplication fields.The experimental resultsverify the correctness of the theoretical analysis.

Key words：switching capacitor（SC）；hybrid step-down；point-of-load（PoL）power supply; miniaturization

0 引言

随着半导体工艺的进步，电子技术也在向超低电压水平发展，新型微处理器供电电压也降至约1V，为实现供电系统小型化，由 28V 甚至48V 二次母线直接降压至 1.0～3.3V 的高降压比非隔离电源需求日益增加[14]。（剩余4984字）