Menene Matsalolin bugun jini
A matsayin nau'in wutar lantarki, IGBT yana buƙatar wani lokacin amsawa daga siginar matakin gate zuwa tsarin sauya na'urar, kamar yadda yana da sauƙin matse hannun da sauri a rayuwa don canza ƙofar, gajeriyar bugun bugun jini na iya haifar da tsayi da yawa. irin ƙarfin lantarki ko matsalolin oscillation mai girma.Wannan al'amari yana faruwa ba tare da taimako ba daga lokaci zuwa lokaci yayin da IGBT ke tafiyar da siginonin sigina masu ƙarfi na PWM.Karamin aikin sake zagayowar, mafi sauƙin shine don fitar da kunkuntar bugun jini, da juyar da halayen dawo da diode na IGBT anti-parallel sabunta diode FWD ya zama cikin sauri yayin sabuntawa mai ƙarfi.To 1700V / 1000A IGBT4 E4, da ƙayyadaddun a cikin junction zafin jiki Tvj.op = 150 ℃, da sauyawa lokaci tdon = 0.6us, tr = 0.12us da tdoff = 1.3us, tf = 0.59us, kunkuntar bugun jini nisa ba zai iya zama kasa kasa. fiye da jimlar ƙayyadaddun lokacin sauyawa.A aikace, saboda wasu halaye daban-daban kamar hoto da ƙarfin kuzari wanda ke cike da ma'anar sifilin yanzu, kunkuntar bugun jini zai bayyana kusa da matsakaicin nauyin halin yanzu, ainihin aikace-aikacen na yanzu kusa da ma'aunin sifili yana da yuwuwar bayyana akan fitarwar waveform high-frequency oscillation, matsalolin EMI sun biyo baya.
kunkuntar bugun jini sabon abu na sanadin
Daga mahimman mahimman bayanai na semiconductor, babban dalilin kunkuntar yanayin bugun jini shine saboda IGBT ko FWD kawai sun fara kunna, ba a cika su nan da nan tare da masu ɗaukar kaya ba, lokacin da mai ɗaukar kaya ya bazu lokacin rufe guntuwar IGBT ko diode, idan aka kwatanta da mai ɗauka gaba ɗaya. cika bayan rufewa, di / dt na iya ƙaruwa.Madaidaicin madaidaicin IGBT-kashe wuce gona da iri za a haifar da shi a ƙarƙashin inductance na commutation, wanda kuma na iya haifar da canji kwatsam a cikin diode mai juyar da dawo da halin yanzu kuma don haka abin mamaki.Koyaya, wannan al'amari yana da alaƙa da IGBT da fasahar guntu FWD, ƙarfin lantarki da na yanzu.
Na farko, dole mu fara daga classic biyu bugun jini makirci, da wadannan adadi ya nuna da sauyawa dabaru na IGBT ƙofar drive irin ƙarfin lantarki, halin yanzu da kuma irin ƙarfin lantarki.Daga ma'anar tuƙi na IGBT, ana iya raba shi zuwa kunkuntar bugun jini kashe lokaci toff, wanda a zahiri yayi daidai da tabbataccen lokacin tafiyar ton na diode FWD, wanda ke da babban tasiri akan juzu'in dawo da kololuwar halin yanzu da saurin dawowa, kamar aya A. a cikin adadi, matsakaicin iyakar ƙarfin dawowa baya ba zai iya wuce iyakar FWD SOA ba;da kunkuntar bugun bugun bugun jini ton, wannan yana da ɗan ƙaramin tasiri akan tsarin kashewa na IGBT, kamar maki B a cikin adadi, galibi IGBT mai kashe wutar lantarki da motsin motsi na yanzu.
Amma kunkuntar na'urar bugun jini kunna kashe kashe zai haifar da wadanne matsaloli?A aikace, menene mafi ƙarancin faɗin bugun bugun jini wanda ya dace?Wadannan matsalolin suna da wahala a samo hanyoyin duniya don yin lissafin kai tsaye tare da ka'idoji da dabaru, bincike na ka'idar da bincike ma kadan ne.Daga ainihin gwajin waveform da sakamako don ganin jadawali don yin magana, bincike da taƙaitaccen halaye da abubuwan gama gari na aikace-aikacen, mafi dacewa don taimaka muku fahimtar wannan sabon abu, sannan inganta ƙirar don guje wa matsaloli.
IGBT kunkuntar bugun bugun jini kunna
IGBT a matsayin sauyawa mai aiki, yin amfani da ainihin lokuta don ganin jadawali don yin magana game da wannan lamari ya fi dacewa, samun wasu busassun kayan abu.
Yin amfani da babban iko mai ƙarfi IGBT4 PrimePACK™ FF1000R17IE4 azaman abin gwajin, halayen kashe na'urar lokacin da ton ya canza ƙarƙashin yanayin Vce=800V, Ic=500A, Rg=1.7Ω Vge=+/-15V, Ta= 25℃, ja shine mai tarawa Ic, blue shine ƙarfin lantarki a ƙarshen IGBT Vce, kore shine ƙarfin lantarki Vge.Vge.pulse ton yana raguwa daga 2us zuwa 1.3us don ganin canjin wannan ƙarfin ƙarfin ƙarfin Vcep, adadi mai zuwa yana hango yanayin yanayin gwajin ci gaba don ganin tsarin canji, musamman wanda aka nuna a cikin da'irar.
Lokacin da ton ya canza Ic na yanzu, a cikin girman Vce don ganin canjin halayen da ton ya haifar.Hotunan hagu da dama suna nuna ƙarfin wutar lantarki Vce_peak a mabambantan igiyoyin Ic ƙarƙashin yanayin Vce = 800V da 1000V bi da bi.daga sakamakon gwaje-gwaje daban-daban, ton yana da ɗan ƙaramin tasiri akan ƙarfin wutar lantarki Vce_peak a ƙananan igiyoyin ruwa;lokacin da kashe-kashe halin yanzu ya karu, kunkuntar kashe bugun bugun jini yana da wuyar samun canje-canje kwatsam a halin yanzu kuma daga baya yana haifar da manyan ƙarfin lantarki.Ɗaukar hotuna na hagu da dama a matsayin daidaitawa don kwatantawa, ton yana da babban tasiri akan tsarin rufewa lokacin da Vce da Ic na yanzu suka fi girma, kuma yana iya samun canji na yanzu kwatsam.Daga gwajin don ganin wannan misalin FF1000R17IE4, mafi ƙarancin bugun jini mafi ƙarancin lokacin da bai gaza 3us ba.
Shin akwai bambanci tsakanin aikin manyan na'urori na yanzu da ƙananan na'urori na yanzu akan wannan batu?Ɗauki FF450R12ME3 matsakaicin wutar lantarki a matsayin misali, adadi mai zuwa yana nuna yawan ƙarfin wutar lantarki lokacin da ton ya canza don igiyoyin gwaji daban-daban Ic.
Irin wannan sakamako, tasirin ton akan kashe wutar lantarki overshoot ba shi da komai a ƙananan yanayin halin yanzu ƙasa da 1/10*Ic.Lokacin da aka ƙara halin yanzu zuwa ƙimar halin yanzu na 450A ko ma 2 * Ic halin yanzu na 900A, ƙarfin wutar lantarki tare da faɗin ton a bayyane yake.Don gwada aikin halayen yanayin aiki a ƙarƙashin matsanancin yanayi, sau 3 ƙimar halin yanzu na 1350A, ƙarfin wutar lantarki ya zarce ƙarfin toshewa, an saka shi cikin guntu a wani matakin ƙarfin lantarki, mai zaman kansa na ton nisa. .
Hoto na gaba yana nuna nau'ikan gwajin kwatancen ton = 1us da 20us a Vce=700V da Ic=900A.Daga ainihin gwajin, ƙirar bugun bugun jini a ton = 1us ya fara motsawa, kuma ƙarfin ƙarfin lantarki Vcep yana 80V sama da ton = 20us.Don haka, ana ba da shawarar cewa mafi ƙarancin lokacin bugun jini kada ya zama ƙasa da 1us.
FWD kunkuntar bugun bugun jini kunna
A cikin da'irar rabin gada, IGBT kashe bugun bugun bugun jini yayi daidai da lokacin kunna FWD.Hoton da ke ƙasa yana nuna cewa lokacin da lokacin kunna FWD ya kasa da 2us, ƙimar FWD na baya zai ƙaru a ƙimar halin yanzu na 450A.Lokacin da toff ya fi 2us, kololuwar FWD baya dawo da halin yanzu ba ya canzawa.
IGBT5 PrimePACK ™ 3 + FF1800R17IP5 don lura da halaye na diodes masu ƙarfi, musamman a ƙarƙashin ƙananan yanayi tare da canje-canjen ton, jere na gaba yana nuna yanayin VR = 900V, 1200V, a cikin ƙananan halin yanzu IF = 20A yanayin kwatanta kai tsaye. na nau'ikan waveform guda biyu, a bayyane yake cewa lokacin da ton = 3us, oscilloscope ya kasa riƙe girman girman wannan mitar mitar.Wannan kuma yana tabbatar da cewa babban mitar oscillation na lodi na halin yanzu sama da sifili a cikin aikace-aikacen na'ura mai ƙarfi da tsarin dawo da ɗan gajeren lokaci na FWD yana da alaƙa da kusanci.
Bayan duba tsarin igiyar hankali, yi amfani da ainihin bayanai don ƙara ƙididdigewa da kwatanta wannan tsari.dv/dt da di/dt na diode sun bambanta da toff, kuma ƙarami lokacin tafiyar FWD, da sauri halayensa na juyawa zasu zama.Lokacin da mafi girma VR a duka ƙarshen FWD, yayin da bugun jini na diode ya zama kunkuntar, saurin dawo da diode ɗinsa zai haɓaka, musamman kallon bayanan cikin ton = yanayin 3us.
VR = 1200V lokacin.
dv/dt=44.3kV/mu;di/dt=14kA/mu.
VR=900V.
dv/dt=32.1kV/mu;di/dt=12.9kA/mu.
Dangane da ton = 3us, madaidaicin motsin igiyar igiyar ruwa ya fi ƙarfi, kuma bayan wurin aiki mai aminci na diode, kan lokaci bai kamata ya zama ƙasa da 3us daga mahangar diode FWD ba.
A cikin ƙayyadaddun ƙayyadaddun ƙarfin wutar lantarki na 3.3kV IGBT a sama, FWD na gaba conduction lokacin ton an bayyana a sarari kuma ana buƙata, ɗaukar 2400A/3.3kV HE3 a matsayin misali, ƙaramin lokacin gudanarwar diode na 10us an ba shi a sarari azaman iyaka, wanda shine yafi saboda tsarin kewayawa inductance inductance a cikin manyan aikace-aikacen wutar lantarki yana da girma, lokacin sauyawa yana da tsayi sosai, kuma mai wucewa a cikin aiwatar da buɗe na'urar Yana da sauƙi a wuce matsakaicin izinin diode ikon amfani da PRQM.
Daga ainihin sigar gwajin gwaji da sakamakon tsarin, duba jadawali kuma kuyi magana game da wasu mahimman bayanai.
1. tasirin ton nisa na bugun jini akan IGBT kashe ƙananan halin yanzu (kimanin 1/10 * Ic) ƙanana ne kuma ana iya yin watsi da shi.
2. IGBT yana da takamaiman dogaro akan ton nisa na bugun jini lokacin kashe babban halin yanzu, ƙarami ton ɗin shine mafi girman ƙarfin ƙarfin ƙarfin V, kuma kashewa na yanzu zai canza ba zato ba tsammani kuma babban mitar oscillation zai faru.
3. Halayen FWD suna haɓaka tsarin dawo da baya yayin da akan lokaci ya zama ya fi guntu, kuma guntuwar FWD akan lokaci zai haifar da babban dv/dt da di/dt, musamman a ƙarƙashin ƙananan yanayi na yanzu.Bugu da ƙari, IGBT masu ƙarfin ƙarfin lantarki ana ba da mafi ƙarancin lokacin kunna diode tonmin = 10us.
Haƙiƙanin ƙaƙƙarfan ƙaƙƙarfan ƙaƙƙarfan gwaji a cikin takarda sun ba da ɗan taƙaitaccen lokaci don taka rawa.
Zhejiang NeoDen Technology Co., Ltd. yana kera da fitar da kananan injunan karba da wuri daban-daban tun daga 2010. Yin amfani da fa'idodin R&D masu arziƙin namu, samar da ingantaccen horarwa, NeoDen ya sami babban suna daga abokan cinikin duniya.
Tare da kasancewar duniya a cikin ƙasashe sama da 130, kyakkyawan aiki, babban daidaito da amincin injunan NeoDen PNP sun sa su zama cikakke don R&D, ƙwararrun samfuri da ƙananan zuwa matsakaicin samar da tsari.Muna ba da mafita na ƙwararrun kayan aikin SMT tasha ɗaya.
Ƙara:No.18, Tianzihu Avenue, garin Tianzihu, gundumar Anji, birnin Huzhou, lardin Zhejiang, kasar Sin
Waya:86-571-26266266
Lokacin aikawa: Mayu-24-2022