DC-AC INVERTER.ppt

1、直流-交流转换器，原理介绍，直流/交流转换器(1)直流/交流转换器(2)液晶屏上的直流-交流转换器电路(示例)，直流。 thisisthecircuitwhichoutputs 100 vofthealternatingcurrentfromtheinputof 12 vofthedirectcurrent.thesignaloftheoscillatorhasthesign 1-tr4. tr2andtr4arethetransistorforthemainswitching.becausethesetransistorsaredifficulttodrive he IC，theymakea

2、mplifyintheell andtr3andtr 4连接ctsinthewayofbeingcalledthedarlingtonconnection.thetransformerthattheinputis 100 vandtheoutputis 24 vint Heon ewith inputandtheoutputoppositeanduses.theoutputvoltageisthesquarewave.whentheloadisadded。 thewaveformoftheoutputvoltagechangesbytheinductanceofthetransformer .

3、DC/AC转换器(2)， thesquarewaveosciiii thisisthesquarewaveoscillatorwhichusedacmos-type logic inverters.iusethewordlogicinvertertoavoidconfusionw AC inverter.theoutputoftheoscillatorisconnectedwithedrivecircuitthroughthelogicinverters.theantiphasesignalofthealterrs实体rter，too.connecttheinputofthelogicinve

4、rtersnottobeusingwithegroundingtoavoidbadinfluence.minimumfrequencyf=1/(2) (2.2x2x 1 (20.328 x 10-3 )=49.2 hzmaximumfrequencyf=1/(2.2xcxr )=1/(2.2xcxr ) (10.648 x 10-3 )=93.9 Hz，超驱动器芯片， becausetheoutputoftheoscillatoristhettlof0vto5v，itisconvertedintotheamplitudeofvibrationof0vto 12 vtodriveanfetwit

5、hiscircuit power mos fet交换机芯片组是thisistheswitchingcircuitwhisthemaincircuitofthedc/acinverterthistime.weusedc-mosfetcircuitbypowermosfet.twosetsofc-mosfetcircuitsareusedandarecontrolledbytheanted oftheinput tr 3和6补偿命令和4 a NDT r 5补偿命令. therefore theelectriccurrentflowsthroughthedirectionofatobtothesecondarycoil (12 v侧) of the transformer .thepowermosfetswitces when the inpup tr 3和6 becomeoffconditionandtr4a NDT r5become on condition .改进版。 theelectriccurrentwhich