一種混合高降壓比DC/DC變換器設(shè)計與研究

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中圖分類號：TM46 文獻標(biāo)志碼：A 文章編號：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

隨著半導(dǎo)體工藝的進步，電子技術(shù)也在向超低電壓水平發(fā)展，新型微處理器供電電壓也降至約1V，為實現(xiàn)供電系統(tǒng)小型化，由 28V 甚至48V 二次母線直接降壓至 1.0～3.3V 的高降壓比非隔離電源需求日益增加[14]。（剩余4984字）