高效率升压转换器夺取并行端口

电路窃取从并行端口，功率为8mA在5V提供效率高达94%。

Maxim>AppNotes>AMPLIFIERANDCOMPARATORCIRCUITSPOWER-SUPPLYCIRCUITSKeywords:powerconversion,parallelport,stepupswitchingconverter,SchottkydiodesMar14,2005APPLICATIONNOTE3468High-EfficiencyStep-UpConverterRobsParallelPortAbstract:Circuitincludingastep-upswitchingconverterstealspowerfromaparallelport,providing5Vat8mAwithefficiencyashighas94%.ThecircuitofFigure1stealsenergyfromaparallelportorfromanylimited-energysource.Suchpower-conversionapplicationsusuallyrequireveryhighefficiencyformakinguseoftheenergyavailable.Aparallel-dataport,forinstance,providesasmuchas2.6mAperdatalineat2.4V.Whentheeightdatalinesaresoftware-configuredtoFFHEX(allhigh),thatconditi