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首先,我也是新手.看了你的帖子,感覺(jué)勇氣可嘉,但是方法我不認(rèn)同.看了幾天書,幾天論壇,就可以開始做變頻器了?給你幾個(gè)建議,1既然你第一次學(xué)習(xí)性質(zhì)的,是不是可以想辦法以很低的價(jià)格買臺(tái)小功率二手的變頻器,研究一下他們的實(shí)際線路;2就算你要自己搭線路,是不是可以先做個(gè)很低電壓的嘗試,比如直流給個(gè)20V,30V,做成了,再試試220V的.

4AnVariableSpeedDrivecanconverter50Hzto60Hzeasily.ButtheVSDoutputisPWMwave,andifinputequalsoutput,over-modulationisalwaysapplied.EvenwithanadditionalLCfilter,youcannotgeta220V/60HzsineoutputwithoutboostingDCvoltage.

TheIGBTselectistotallydecidedbyyourheatcondition.Asusualdesign,Ithink15AisOK.IFyoucankeeptheIGBT50Deg.C.Youmaychoose5A,6AIGBTs.

Doyouinversethediode?

findthe"short"inthelibrary,itisequaltoacurrentmeter.Goodluck.

能否留言,或者給我站內(nèi)短信,告訴我如何解決的,謝謝!

MaybethereissomethingwrongwithyourDCvoltagemeasurement.Idonotknowthe"5級(jí)級(jí)聯(lián)到380v".Haveyoumeasuredyourdcvoltagewith500Wand7500Wload.Oryoumaytrytomeasurethesmall-scaledcvoltagewhichfedtoyourMCU.Imettheproblem,thedcvoltagemeasurementdelayleadtoabadoutputcurrent.Goodluck.

感覺(jué)還是接地的問(wèn)題,你前面提到的數(shù)字地接地,功率地接電容后接地.自舉型變頻器只有一個(gè)公共地阿.還有,可否嘗試在你的通信回路中加一個(gè)或一對(duì)反相器啊.還有,可否貼出圖來(lái)阿.

Whydoyoualwaysfocusonthedv/dt,haveyoumeasuredrealthedv/dtwithscope.Idonotknowmuchaboutthecommunication.Forthedvdtfilter,itcanbeadeltaconnectionRCfitler,youcanfindsomepaper,justusegoogleorbaidu.Isthereanypossible,thereissomethingwrongwithyourpowersupply,orcommunicationpartdesign.