简介:多模式同步PWM控制器UCC39421系列,可用于升压、回归和SEPIC拓扑中,在1.8V到8V之间的输入电压下工作,输出电压从2.5V到8V。本文详细地介绍了UC39421的应用。
简介:ThispaperpresentsanewPulseWidthModulation(PWM)controllerforUnmannedAerialVehicle(UAV)precisionsprayerforagricultureusingaTL494fixed-frequencypulsewidthmodulatortogetherwithadataacquisitionboardanddevelopedsoftware.AnUAVcanberemotelycontrolledorflownautonomouslybypre-programmedflightplans.ThePWMcontrollerwasimplementedthroughtheguidancesystemontheUAVwithcontrolcommandssentbetweentheUAVhelicopterandthegroundcontrolstationviaawirelesstelemetrysystem.ThePWMcontrollerwastestedandvalidatedusingLabVIEW8.2.Severalanalyseswereperformedinalaboratorytotestdifferentcontrolsignals.TheresultsshowthatthePWMcontrollerhaspromiseasahigherprecisiontechniqueforsprayapplications,whichwillimproveefficiencyofpesticideapplication,especiallyincropproductionareas.