简介：无线遥控器由TX-2B进行编码控制按键，将数字脉冲信号输入到AT89C51单片机的P1．0-P1．4口，控制单片机对应输出的P3．0-P3．3口的PWM信号控制功率管驱动电路．由直流电动机带动现有玩具小车机械传动装置，实现遥控电动玩具车的动作功能。

简介：摘要矿井提升机在整个矿井的运输过程中承处于相当重要的地位，PWM（PulseWidthModulation）--脉冲宽度调制以其简单的结构，易于实现的成熟的技术等特点在矿井提升机中被普遍应用。

简介：Inthispaper,ananalyticaltechniqueispresentedfortimedomainanalysis(transientandsteady-stateresponse)ofperturbedPWMpush-pullDC-DCconverterusinginterestingcorollaryonKharitonov'stheorem.ThemainadvantageoftheproposedanalysisisthateventhoughthetransferfunctionmodelofaPWMpush-pullDC-DCconverterisperturbed,thecompleteanalysishasbeendoneonalineartransferfunctionmodelofaPWMpush-pullDC-DCconverter.TheproposedanalysisisverifiedusingMATLABsimulation.Thisanalysiswillbeverymuchusefultopowerelectronicsengineers,sincethetechniqueisverysimpleandcomputationallyefficientandeasilyapplicableinpreciseapplicationssuchasaerospaceapplications.