FinalYearProject最后一年的项目

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1、FinalYearProjectFinalPresentationTitle:EnergyConversionforlowvoltagesources.Supervisor:Dr.MaeveDuffyAimofProjectTheaimofthisprojectwastodevelopcircuitstodemonstratetheperformanceofbiofuelcellswhicharebeingdevelopedbytheEnergyresearchcentreinNUIGalway.TheidealendgoalwouldhavebeenwhereaMicrobialFuelCe

2、llarrangementhastheabilitytochargeamobilephonebattery.OutlineofPresentationThispresentationwilldealwiththefollowingtopics:OverviewofProjectWorkCompletedOutlookforfuturedevelopmentConclusionsQuestions1)Overviewofproject:DemonstrationCircuit:2)WorkCompleted:ThéveninEquivalentcircuit:LEDDemonstrationDe

3、monstrationoffuelcellpoweringlowpowerdevicesStorageCapacitorKnowledgeofchargingalgorithmsDemonstrationoffuelcellpoweringaDCFanThéveninEquivalentcircuit:PowerDensitycurve:BluelinerepresentsthepowerdensityVscurrentdensity.WhitelinerepresentsVoltageVscurrentdensity.Areaacrosswhichpowerdensityismeasured

4、is5.4cm^2.1cm^2=0.0001m^2Thepointatwhichwehavemaximumpoweroutputisthesecondfromrightsowetakethispoint.Whenworkedoutthefollowingoutputsresult:Power~0.486milli-WattsVoltage~0.42voltsCurrent~1.215milli-AmpsInternalResistanceofFuelCell~345ohmsThéveninEquivalentcircuit:LEDDemonstration:OntestingtheLED’sf

5、oundintheelectronicslabsitwasfoundthatthelowestpowerLEDneededaminimumof3.8milli-Ampsandaminimumof1.83voltstolight.Thismeantthevoltage¤toutputfromthefuelcellneededtobesteppedup.Thereisthreesolutionstothisproblem:Cascadeanumberoffuelcellsinparallel,thiswayincreasingthecurrentoutputandthenuseaDC-

6、DCboostconvertertostepupthevoltage.UseanRCcircuittoboostthecurrentusingamosfetforswitchingandthenuseaDC-DCboostconvertertostepthevoltageup.UsealowpowerLED(1milli-AmpLEDcanbeobtained)Lowpowerdevicesidentified:Voltageneeded:1.5VoltsDCPowerneeded:0.0001WattsCurrentneeded:66.66micro-AmpsVoltageneeded:2.

7、7voltsDCPowerneeded:1.4WattsCurrentneeded:0.42AmpsVoltageneeded:~3.3voltsDCPowerneeded:unknownCurrentneeded:unknownDemonstrationoffuelcellpoweringlowpowerdevices:TodemonstratethesedevicesaDC-DCboostco