Kodi Narrow Pulse Phenomenon ndi chiyani
Monga mtundu wa kusintha kwa mphamvu, IGBT imafunikira nthawi yochitirapo kanthu kuchokera pachipata cha chipata kupita ku njira yosinthira chipangizocho, monga momwe zimakhalira zosavuta kufinya dzanja mwachangu kwambiri m'moyo kuti musinthe chipata, kugunda kwakufupi kwambiri kungayambitse kutsika kwambiri. ma spikes a voltage kapena zovuta za frequency oscillation.Chodabwitsa ichi chimachitika mopanda thandizo nthawi ndi nthawi pamene IGBT imayendetsedwa ndi ma PWM opangidwa ndi ma frequency apamwamba.Kayendedwe kakang'ono ka ntchito, ndikosavuta kutulutsa ma pulse opapatiza, ndipo mawonekedwe obwezeretsanso a IGBT anti-parallel renewal diode FWD amakhala mwachangu pakukonzanso kolimba.Kuti 1700V/1000A IGBT4 E4, specifications mu mphambano kutentha Tvj.op = 150 ℃, kusintha nthawi tdon = 0.6us, tr = 0.12us ndi tdoff = 1.3us, tf = 0.59us, sangakhale zochepa zimachitika m'lifupi kuposa kuchuluka kwa nthawi yosinthira.M'malo mwake, chifukwa cha mawonekedwe osiyanasiyana olemetsa monga photovoltaic ndi kusungirako mphamvu mochulukira pamene mphamvu ya +/- 1, kugunda kocheperako kumawonekera pafupi ndi zero pano, monga reactive power jenereta SVG, yogwira fyuluta APF mphamvu ya 0, kugunda kopapatiza kudzawoneka pafupi ndi kuchuluka kwa katundu wapano, kugwiritsa ntchito kwenikweni kwaposachedwa pafupi ndi zero point kumakhala kosavuta kuwonekera pamtundu wamagetsi othamanga kwambiri, zovuta za EMI zimachitika.
Chopapatiza kugunda chodabwitsa chifukwa
Kuchokera pazikhazikitso za semiconductor, chifukwa chachikulu cha zochitika zopapatiza ndi chifukwa cha IGBT kapena FWD yomwe idangoyamba kuyatsa, osadzazidwa nthawi yomweyo ndi zonyamulira, pamene chonyamuliracho chimafalikira potseka IGBT kapena diode chip, poyerekeza ndi chonyamulira kwathunthu. kudzazidwa pambuyo kutsekedwa, di / dt ikhoza kuwonjezeka.Kuchulukitsa kwamphamvu kwa IGBT kofananako kudzapangidwa pansi pa commutation stray inductance, zomwe zingayambitsenso kusintha kwadzidzidzi kwa diode reverse recovery current ndipo motero zimangochitika mwadzidzidzi.Komabe, chodabwitsa ichi chikugwirizana kwambiri ndi IGBT ndi FWD chip teknoloji, magetsi a chipangizo ndi zamakono.
Choyamba, tiyenera kuyamba kuchokera ku classic double pulse schematic, chithunzi chotsatirachi chikuwonetsa kusintha kwa IGBT gate drive voltage, panopa ndi voltage.Kuchokera pamalingaliro oyendetsa a IGBT, amatha kugawidwa kukhala yopapatiza nthawi yopumira, yomwe imafanana ndi nthawi yabwino yoyendetsera matani a diode FWD, yomwe ili ndi chikoka chachikulu pakubwezeretsanso nsonga yaposachedwa komanso kuthamanga, monga mfundo A. m'chithunzichi, mphamvu yapamwamba kwambiri yobwezeretsanso sichikhoza kupitirira malire a FWD SOA;ndi yopapatiza pulse kutembenukira pa nthawi toni, izi zimakhala ndi chikoka chachikulu pa IGBT kuzimitsa ndondomeko, monga mfundo B pachithunzichi, makamaka IGBT kuzimitsa voteji spikes ndi oscillations panopa trailing.
Koma kuzimitsa kocheperako kungayambitse mavuto otani?Mukuchita, ndi malire ochepera a pulse wide omwe ali oyenera?Mavutowa ndi ovuta kupeza njira zapadziko lonse kuti ziwerengedwe mwachindunji ndi malingaliro ndi ndondomeko, kusanthula kwamalingaliro ndi kafukufuku ndizochepa.Kuchokera pamawonekedwe enieni oyeserera ndi zotsatira kuti muwone graph kuti mulankhule, kusanthula ndi chidule cha mikhalidwe ndi zofananira zakugwiritsa ntchito, ndizothandiza kwambiri kukuthandizani kumvetsetsa izi, kenako kukhathamiritsa kapangidwe kake kuti mupewe mavuto.
Kutsegula kwa IGBT kocheperako
IGBT ngati chosinthira chogwira ntchito, kugwiritsa ntchito zochitika zenizeni kuti muwone graph kuti alankhule za izi ndizotsimikizika, kukhala ndi zinthu zina zouma.
Pogwiritsa ntchito gawo lamphamvu kwambiri la IGBT4 PrimePACK™ FF1000R17IE4 ngati chinthu choyesera, mawonekedwe azimitsa chipangizocho pomwe matani amasintha malinga ndi Vce=800V, Ic=500A, Rg=1.7Ω Vge=+/-15V, Ta= 25 ℃, wofiira ndi wokhometsa Ic, buluu ndi voteji kumapeto onse a IGBT Vce, wobiriwira ndi galimoto voteji Vge.Vge.pulse ton imachepa kuchokera ku 2us kupita ku 1.3us kuti muwone kusintha kwa voteji iyi Vcep, chithunzi chotsatirachi chikuwonetsa mawonekedwe oyeserera pang'onopang'ono kuti muwone kusintha, makamaka kuwonetsedwa mubwalo.
Toni ikasintha Ic yamakono, mu Vce dimension kuti muwone kusintha kwa matani obwera chifukwa cha matani.Ma graph akumanzere ndi kumanja amawonetsa ma spikes amagetsi Vce_peak pamafunde osiyanasiyana Ic pansi pa Vce = 800V ndi 1000V motsatana.kuchokera pazotsatira zoyeserera, matani amakhala ndi zotsatira zochepa pamagetsi amagetsi Vce_peak pamafunde ang'onoang'ono;pamene kutembenuka kwaposachedwa kukuwonjezeka, kutembenuka kwapang'onopang'ono kumakhala kosavuta kusintha kwadzidzidzi pakalipano ndipo kenaka kumayambitsa ma voteji apamwamba.Kutenga ma grafu kumanzere ndi kumanja monga kugwirizanitsa kufananitsa, toni imakhala ndi mphamvu yaikulu pa ndondomeko yotseka pamene Vce ndi Ic yamakono ndi apamwamba, ndipo amatha kukhala ndi kusintha kwadzidzidzi.Kuchokera ku mayeso kuti muwone chitsanzo ichi FF1000R17IE4, kugunda kocheperako kumakhala nthawi yabwino kwambiri yosachepera 3us.
Kodi pali kusiyana kotani pakati pa magwiridwe antchito a ma module apamwamba kwambiri ndi ma module apano otsika pankhaniyi?Tengani FF450R12ME3 gawo la mphamvu yapakatikati monga chitsanzo, chithunzi chotsatirachi chikuwonetsa kuphulika kwa voteji pamene tani ikusintha mafunde osiyanasiyana oyesa IC.
Zotsatira zofananira, zotsatira za matani pakuwotcha kwamagetsi ndizosavomerezeka pamikhalidwe yotsika yomwe ili pansi pa 1/10 * Ic.Pamene panopa chiwonjezeke kwa oveteredwa panopa 450A kapena 2 * Ic panopa 900A, voteji overshoot ndi tani m'lifupi ndi zoonekeratu.Pofuna kuyesa momwe magwiridwe antchito amagwirira ntchito pazovuta kwambiri, 3 nthawi zomwe zidavotera 1350A, ma spikes amagetsi apitilira mphamvu yotsekereza, akuphatikizidwa mu chip pamlingo wina wamagetsi, osadalira kuchuluka kwa matani. .
Chithunzi chotsatirachi chikuwonetsa mafunde oyerekeza a ton=1us ndi 20us pa Vce=700V ndi Ic=900A.Kuchokera pamayesero enieni, gawo la pulse width pa ton = 1us layamba kugwedezeka, ndipo voliyumu ya Vcep ndi 80V kuposa ton = 20us.Chifukwa chake, tikulimbikitsidwa kuti nthawi yocheperako isakhale yochepera 1us.
FWD yopapatiza kugunda kwamphamvu
Mu dera la theka la mlatho, IGBT turn-off pulse toff imagwirizana ndi FWD yotsegula tani ya nthawi.Chithunzi chomwe chili pansipa chikuwonetsa kuti nthawi yotembenuka ya FWD ikachepera 2us, nsonga ya FWD yobwereranso idzawonjezeka pamlingo wa 450A.Toff ikakhala wamkulu kuposa 2us, chiwongola dzanja cha FWD chosinthira sichisintha.
IGBT5 PrimePACK™3 + FF1800R17IP5 kuti muwone mawonekedwe a ma diode amphamvu kwambiri, makamaka pansi pamikhalidwe yotsika ndi kusintha kwa matani, mzere wotsatirawu ukuwonetsa VR = 900V, 1200V mikhalidwe, m'mikhalidwe yaying'ono yapano IF = 20A yofananira mwachindunji. mwa mawonekedwe awiriwa, zikuwonekeratu kuti pamene tani = 3us, oscilloscope yalephera kugwira The matalikidwe a oscillation mkulu pafupipafupi.Izi zikutsimikiziranso kuti kugwedezeka kwapang'onopang'ono kwa katundu pakali pano paziro pazida zogwiritsira ntchito zida zamphamvu kwambiri komanso njira yachidule ya FWD yobwezeretsanso kwakanthawi ndizogwirizana kwambiri.
Pambuyo poyang'ana mawonekedwe owoneka bwino, gwiritsani ntchito deta yeniyeni kuti mupitirize kuwerengera ndikuyerekeza ndondomekoyi.dv/dt ndi di/dt ya diode imasiyana ndi toff, ndipo nthawi yocheperako ya FWD, mawonekedwe ake amabwereranso mwachangu.Pamene VR ili pamwamba pa malekezero onse a FWD, pamene diode conduction pulse ikukhala yopapatiza, diode reverse reverse recovery speed idzafulumizitsa, makamaka kuyang'ana deta mu tani = 3us mikhalidwe.
VR = 1200V pamene.
dv/dt=44.3kV/ife;di/dt=14kA/us.
Pa VR = 900V.
dv/dt=32.1kV/ife;di/dt=12.9kA/us.
Poyang'ana tani = 3us, mawonekedwe a mafunde apamwamba kwambiri oscillation ndi ovuta kwambiri, ndipo kupyola malo otetezeka a diode, pa nthawi sikuyenera kukhala osachepera 3us kuchokera ku diode FWD.
Pofotokoza za high-voltage 3.3kV IGBT pamwamba, FWD forward conduction time ton yafotokozedwa momveka bwino ndipo ikufunika, kutenga 2400A/3.3kV HE3 mwachitsanzo, nthawi yochepa ya diode conduction ya 10us yaperekedwa momveka bwino ngati malire, zomwe makamaka chifukwa dongosolo dera osokera inductance mu mkulu-mphamvu ntchito ndi lalikulu, kusintha nthawi ndi yaitali, ndi osakhalitsa mu ndondomeko kutsegula chipangizo N'zosavuta kupitirira pazipita kololeka diode mphamvu ya PRQM.
Kuchokera pamawonekedwe enieni a mayeso ndi zotsatira za gawoli, yang'anani pazithunzi ndikulankhula zachidule chazofunikira.
1. zotsatira za pulse width ton pa IGBT zimitsani zamakono (pafupifupi 1/10 * Ic) ndizochepa ndipo zingathe kunyalanyazidwa.
2. IGBT imakhala ndi kudalira kwina kwa pulse m'lifupi tani pamene ikuzimitsa zamakono, tani yaying'ono ndi yokwera kwambiri ya V voteji spike V, ndipo kutembenuka kwamakono kudzasintha mwadzidzidzi ndipo kuthamanga kwafupipafupi kudzachitika.
3. Makhalidwe a FWD amafulumizitsa ndondomeko yobwezeretsanso pamene nthawiyo imakhala yochepa, ndipo kufupikitsa kwa FWD pa nthawi kumayambitsa dv / dt ndi di / dt yaikulu, makamaka pansi pa nthawi yochepa.Kuphatikiza apo, ma IGBT okwera kwambiri amapatsidwa nthawi yowoneka bwino ya diode tonmin=10us.
Mafunde enieni oyeserera papepala apereka nthawi yocheperako kuti achitepo kanthu.
Zhejiang NeoDen Technology Co., Ltd. yakhala ikupanga ndi kutumiza kunja makina osiyanasiyana ang'onoang'ono osankha ndi malo kuyambira 2010. Kutengera mwayi wathu olemera odziwa R&D, kupanga ophunzitsidwa bwino, NeoDen imapeza mbiri yabwino kuchokera kwa makasitomala padziko lonse lapansi.
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Nthawi yotumiza: May-24-2022