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1、WirelessEnergyTransmissionSystemForLow-PowerDevicesPeterSpies,PhilipBabelDepartmentPowerEfficientSystemsFraunhoferIISNuremberg,GermanyPeter.spies@iis.fraunhofer.deAbstract—Thispaperdescribesanelectronicsystemforwavelengthinductivecouplingisemployed.Well-knownwireless
2、energytransmissiontosupplylow-powerelectronicexampleforthiseffectisthetransformerinformoftwodeviceslikewirelesssensors.Itpresentsthefirstreceivercoupledinductors.Thebasicrelationswillbepresentedhere.ASICsforthiskindofapplication.TwoprototypeswithsupplyThemagneticindu
3、ctanceBofonecoilofthetransformeriscurrentsof4and100milliAmperesserveasproof-of-concept.Furthermore,severalimplementationsoftransmittersandN⋅r2receiverswithoff-the-shelfcomponentsarediscussed,showing1B=μ⋅⋅I,031differentsystemoptions.2⋅()r2+x22whereµ0isthemagneticfield
4、constant,N1isthenumberofwindingsontheprimaryinductorofthetransformer,ristheradiusofthiscoil,xisthedistancefromthecentertheI.MOTIVATIONcoilandI1isthecurrentthroughthisinductor.ThemutualLow-powerdevicescommonlyhaveanenergystorageinductanceorcouplingcoefficientMdefinest
5、hefluxfromelementlikeabatteryoracapacitortoprovideenergyfortheprimarywinding,whichisenclosedbythesecondarytheirdifferentelectroniccircuits.Inordertoberecharged,winding.Itiscalculatedasfollowstheenergystoragemustbecable-connectedtoavoltageregulatorandthemainspowersupp
6、ly.Regulator,wiringandN2⋅B⋅A2M=connectorsaswellastheenergystorageitself,especiallyinIcaseofabattery,areoftenasourceoferror.Moreover,1,regulatorsandconnectorsarenotalwayscompatiblewithwhereN2andA2arethenumberofwindingsandtheareadifferentapplicationdevices,sothateachde
7、vicetypeneedsofthesecondarycoil,respectively.TheinducedvoltageU2itsowncustom-tailoredchargingsolution.Theneedforinthesecondarycoiliswiring,connectorsorevenbatteriesinelectronicequipmentcanbeeliminatedbywirelessenergytransmission.Itistheidealsolutionwhenlittleboardspa
8、ceisavailableandlowcostsareofparamountimportance.Besidesmobileterminalsω⋅MU=⋅I.andwirelesssensorsapplicationareascovertotally21122e
