河南科技学院新科学院2012届本科毕业设计(设计)三相变频电源设计学生姓名：王斌所在系别：机电系所学专业：电气工程及其自动化导师姓名：田泽正完成时间：2012年5月15日摘要本设计了一个交流—直流—交流变频电源系统。该系统利用三相电压桥式逆变,并以FPGA为控制核心,采用SPWM变频控制技术,实现了三相正弦波变频输出。其输出线电压有效值为36V,最大输出电流有效值达3A。此外，系统还具有频率测量、电流和电压有效值测量及平均功率测量等功能。变频技术在电源中的应用，极大地减小了电源装置的体积，提高了效率，产生了巨大的经济效益，所谓变频就是利用电力电子器件(如功率晶体管GTR、绝缘栅双极型晶体管(IGBT)将5OHz的市电变换为用户所要求的交流电或其他电源。它分为直接变频(又称交―交变频)，即把市电直接变成比它频率低的交流电，大量用在大功率的交流调速中;间接变频(又称交—直—交变频)，即先将市电整流成直流，再变换为要求频率的交流。它又分为谐振变频和方波变频。前者主要用于中频加热，方波变频又分为等幅、等宽和SPWM变频。常用的方法有正弦波(调制波)与三角波(载波)比较的SPWM法、磁场跟踪式SPWM法和等面积SPWM法等。逆变技术，是指整流技术的逆向变换方式。关键词：逆变器，变频电源，脉宽调制，FPGAAbstractAnAC-DC-ACvariable-frequencypowersupplysystembasedonIM14400isdesignedinthispaper,whichusesFPGAascontrolcore.Thefrequencyconvertingcontrollingtechnologyofsinusoidalpulsewidthmodulation(SPWM)isappliedtogettheoutputofthree-phasevariable-frequencysinewave.TheRMSvoltageis36VandthemaximumRMScurrentisupto3A.Thesystemalsoincludesthefollowingfunctions,SuchasfrequencymeaurementRMSvoltageandcurrentmeasurement,andmeanpowermeasurement.Frequencyofapplicationoftechnologyinthepowersupply,greatlyreducingthepowersupplyunitvolume,improveefficiency,resultinginhugeeconomicbenefits,theso-calledconversionistheuseofpowerelectronicdevices(suchaspowertransistorsGTR,insulatedgatebipolartransistorIGBT)5OHzthecitywillbetransformedintoelectricityrequestedbyusersorotherACpowersupply.Itisdividedintodirect-conversion(alsoknownasAC-ACconverter),thatisconverteddirectlyintoelectricitythanitslowfrequencyofthealternatingcurrent,alargenumberusedinthehigh-powerACDriveCentral;indirectconversion(alsoknownasAC-Direct-ACInverter),whichisfirstrectifiedintoDCelectricity,andthentransformedintothefrequencyofcommunicationrequired.Itconsistsofresonantfrequencyandthesquare-waveinverter.Theformerismainlyusedformediumfrequencyheating,square-wavefrequencyisdividedintoequalamplitude,widthandtheSPWMinverter.Commonlyusedmethodsaresinewave(modulatedwave)andthetriangularwave(carrier)tocomparetheSPWMmethod,themagneticfieldTrackingSPWMl