Chii chinonzi Narrow Pulse Phenomenon
Serudzi rwekuchinja kwesimba, IGBT inoda imwe nguva yekuita kubva kugedhi nhanho chiratidzo kune iyo kifaa switching process, sezvazviri nyore kudzvanya ruoko nekukurumidza muhupenyu kuti uchinje gedhi, kupfupika kuvhura kupuruzira kunogona kukonzera kukwira zvakanyanya. voltage spikes kana high frequency oscillation matambudziko.Ichi chiitiko chinoitika chisingabatsiri nguva nenguva sezvo IGBT ichifambiswa nepamusoro-frequency PWM modulated zviratidzo.Iyo idiki iyo yebasa kutenderera, zviri nyore kuburitsa yakamanikana pulses, uye reverse kudzoreredza maitiro eIGBT anti-parallel renewal diode FWD inova nekukurumidza panguva yakaoma-kuchinja patsva.Ku 1700V/1000A IGBT4 E4, iyo yakatarwa mujoni tembiricha Tvj.op = 150 ℃, iyo switching nguva tdon = 0.6us, tr = 0.12us uye tdoff = 1.3us, tf = 0.59us, haigone kupfupika hupamhi hwepurusi. kupfuura huwandu hweiyo yakatarwa switching nguva.Mukuita, nekuda kweakasiyana emutoro hunhu senge photovoltaic uye kuchengetedza simba zvakanyanya kana iyo simba chinhu che +/ - 1, iyo yakatetepa pulse ichaonekwa padhuze neazvino zero point, senge reactive simba jenareta SVG, inoshanda sefa APF simba chinhu che0, iyo yakatetepa pulse ichaonekwa padhuze neakanyanya mutoro ikozvino, iko iko kushandiswa kweiyo ikozvino padhuze ne zero point inowanzoitika pane inobuda waveform yakakwirira-frequency oscillation, EMI matambudziko anotevera.
Narrow pulse phenomenon yechikonzero
Kubva pane semiconductor basics, chikonzero chikuru cheiyo nhete pulse phenomenon inokonzerwa neIGBT kana FWD ichangotanga kuvhurika, kwete nekukurumidza kuzadzwa nevatakuri, apo mutakuri akapararira paanovhara IGBT kana diode chip, zvichienzaniswa nemutakuri zvachose. yakazadzwa mushure mekuvhara, di / dt inogona kuwedzera.Iyo inoenderana yakakwira IGBT yekudzima overvoltage ichagadzirwa pasi peiyo commutation yakarasika inductance, iyo inogona zvakare kukonzera kamwe kamwe shanduko mu diode reverse kudzoreredza ikozvino uye nekudaro snap-off chiitiko.Nekudaro, chiitiko ichi chakabatana zvakanyanya neIGBT uye FWD chip tekinoroji, mudziyo voltage uye zvazvino.
Chekutanga, isu tinofanirwa kutanga kubva kukirasi mbiri pulse schematic, inotevera nhamba inoratidza switching logic yeIGBT gedhi drive voltage, yazvino uye voltage.Kubva pane yekutyaira logic yeIGBT, inogona kupatsanurwa kuita yakamanikana pulse off time toff, iyo inonyatsoenderana neyakanaka conduction nguva toni ye diode FWD, ine simba guru pakudzoreredza kudzoreredza peak ikozvino uye kupora kumhanya, senge point A. mumufananidzo, iyo yepamusoro peak simba rekudzoka reverse haigoni kudarika muganhu weFWD SOA;uye yakamanikana pulse turn-on time ton, izvi zvine mhedzisiro yakakura pane IGBT yekudzima-maitiro, senge point B mumufananidzo, kunyanya IGBT yekudzima voltage spikes uye ikozvino trailing oscillations.
Asi yakanyanya kutetepa pulse mudziyo kudzima-kudzima kunokonzeresa matambudziko api?Mukuita, ndeipi iyo diki pulse hupamhi muganho inonzwisisika?Aya matambudziko akaoma kutora mafomula epasirese kuti averenge zvakananga nedzidziso uye mafomula, ongororo yetioretical uye tsvagiridzo zvakare idiki.Kubva pane chaiyo bvunzo waveform uye mhedzisiro kuti uone girafu yekutaura, kuongorora uye pfupiso yehunhu uye zvakajairika zvechishandiso, zvakanyanya kukubatsira kuti unzwisise chiitiko ichi, uye wozokwidziridza dhizaini kudzivirira matambudziko.
IGBT narrow pulse turn-on
IGBT seshanduko inoshanda, kushandisa zviitiko chaizvo kuona girafu kutaura nezve chiitiko ichi zvakanyanya kugutsa, kuve nezvimwe zvinhu zvakaoma zvinhu.
Uchishandisa iyo yepamusoro-simba module IGBT4 PrimePACK™ FF1000R17IE4 sechinhu chekuyedza, mudziyo unodzima hunhu kana tani ichichinja pasi pemamiriro eVce=800V, Ic=500A, Rg=1.7Ω Vge=+/-15V, Ta= 25 ℃, tsvuku ndiye muunganidzi Ic, bhuruu ndiyo voltage kumagumo ese eIGBT Vce, girini ndiyo drive voltage Vge.Vge.pulse ton inodzikira kubva pa2us kuenda ku1.3us kuti uone shanduko yeiyi voltage spike Vcep, iyo inotevera nhamba inoratidzira test waveform zvishoma nezvishoma kuona shanduko yekuchinja, kunyanya inoratidzwa mudenderedzwa.
Kana toni ichichinja iyo yazvino Ic, muVce dimension kuti uone shanduko yehunhu inokonzerwa netani.Kuruboshwe nekurudyi magirafu anoratidza magetsi spikes Vce_peak pamhepo dzakasiyana Ic pasi peiyo Vce = 800V uye 1000V mamiriro akateerana.kubva pane zvakateerana bvunzo mhinduro, toni ine diki mhedzisiro pane voltage spikes Vce_peak padiki mafungu;kana iyo yekudzima ikozvino ichiwedzera, iyo yakamanikana pulse turn-off inowanzo chinja kamwe kamwe mune yazvino uye inozokonzeresa yakakwira voltage spikes.Kutora magirafu ekuruboshwe nekurudyi semarongedzero ekuenzanisa, toni ine simba rakakura pakuita kwekudzima kana Vce uye yazvino Ic yakakwirira, uye inogona kuve nekungoerekana yachinja.Kubva pabvunzo kuona uyu muenzaniso FF1000R17IE4, iyo shoma pulse toni iyo yakanyanya kunzwisisika nguva isiri pasi pe3us.
Pane mutsauko here pakati pekuita kweakakwira ezvino mamodule uye akaderera azvino mamodule pane iyi nyaya?Tora FF450R12ME3 yepakati simba module semuenzaniso, iyo inotevera nhamba inoratidza iyo voltage overshoot kana tani ichichinja kune akasiyana bvunzo mafungu Ic.
Zvakafanana mhedzisiro, mhedzisiro yetani pakudzima-kudzima voltage overshoot haigoneki pane yakaderera yazvino mamiriro pazasi 1/10 * Ic.Kana iyo yazvino ichiwedzerwa kune yakayerwa ikozvino ye450A kana kunyange 2 * Ic ikozvino ye900A, iyo voltage overshoot nehupamhi hwetani inonyatso pachena.Kuti uedze mashandiro ehunhu hwemamiriro ekushanda pasi pemamiriro akanyanya, 3 nguva dzayakayerwa ikozvino ye1350A, mavoltage spikes akadarika magetsi ekuvharira, achiiswa muchip pane imwe nhanho yevoltage, yakazvimirira pahupamhi hwetani. .
Iyi inotevera nhamba inoratidza kuenzanisa bvunzo waveforms ye ton=1us uye 20us paVce=700V uye Ic=900A.Kubva pabvunzo chaiyo, iyo module pulse wide at ton = 1us yatanga kutenderera, uye voltage spike Vcep iri 80V yakakwirira kupfuura ton = 20us.Nokudaro, zvinokurudzirwa kuti nguva shoma yekurova haifaniri kunge iri pasi pe1us.
FWD narrow pulse turn-on
Muchikamu chehafu-bhiriji, iyo IGBT yekudzima pulse toff inoenderana neFWD yekuvhura-nguva toni.Mufananidzo uri pazasi unoratidza kuti kana FWD yekutendeuka-nguva isingasviki 2us, iyo FWD reverse ikozvino peak ichawedzera pane yakatarwa ikozvino ye450A.Kana toff yakakura kupfuura 2us, iyo yepamusoro FWD reverse kudzoreredza ikozvino haina kuchinjika.
IGBT5 PrimePACK™3 + FF1800R17IP5 yekutarisa maitiro e-high-power diode, kunyanya pasi pemamiriro epasi-azvino ane shanduko yetani, mutsara unotevera unoratidza iyo VR = 900V, 1200V mamiriro, mune diki ikozvino IF = 20A mamiriro ekuenzanisa kwakananga. zvemafungu maviri, zviri pachena kuti kana ton = 3us, iyo oscilloscope yatadza kubata Iyo amplitude yeiyi yakakwirira frequency oscillation.Izvi zvinoratidza zvakare kuti iyo yakakwira-frequency oscillation yemutoro iripo pane zero point mune yakakwirira-simba chishandiso maapplication uye iyo FWD yenguva pfupi yekudzoreredza kudzoreredza maitiro ane hukama.
Mushure mekutarisa iyo intuitive waveform, shandisa iyo chaiyo data kuti uwedzere kuverenga uye kuenzanisa maitiro aya.dv/dt uye di/dt ye diode inosiyana ne toff, uye iyo idiki iyo FWD conduction nguva, iyo inokurumidza hunhu hwayo hwekumashure hunova.Kana iyo yakakwira iyo VR kumigumo yese yeFWD, sezvo diode conduction pulse inova diki, diode yayo reverse kudzoreredza kumhanya inokwidziridzwa, kunyanya kutarisa data mu ton = 3us mamiriro.
VR = 1200V apo.
dv/dt=44.3kV/us;di/dt=14kA/us.
PaVR=900V.
dv/dt=32.1kV/us;di/dt=12.9kA/us.
Tichifunga nezve ton = 3us, iyo waveform yakakwira-frequency oscillation yakanyanya, uye kunze kweiyo diode yakachengeteka nzvimbo yekushanda, iyo-nguva haifanirwe kunge iri pasi pe3us kubva kune diode FWD yekuona.
Mukutsanangurwa kwepamusoro-voltage 3.3kV IGBT pamusoro, iyo FWD yekumberi yekuitisa nguva toni yakatsanangurwa zvakajeka uye inodiwa, kutora 2400A/3.3kV HE3 semuenzaniso, iyo shoma diode conduction nguva ye10us yakapihwa zvakajeka semuganhu, izvo zvinonyanya nekuti system yedunhu rakarasika inductance mune yakakwirira-simba maapplication yakakura, nguva yekuchinja yakarebesa, uye inopfupika mukati mekugadzira mudziyo kuvhurwa Zviri nyore kupfuudza yakanyanya inobvumirwa diode simba rekushandisa PRQM.
Kubva paiyo chaiyo test waveform uye mhedzisiro yemodule, tarisa magirafu uye taura nezve mamwe mapfupi pfupiso.
1. kukanganisa kwepulse width toni paIGBT kudzima diki ikozvino (inenge 1/10 * Ic) idiki uye inogona kunyatso furatirwa.
2. IGBT ine kumwe kutsamira pa pulse width ton painodzima high current, iyo tani diki ndiyo yakakwirira yevoltage spike V, uye yekudzima ikozvino trailing ichachinja kamwe kamwe uye high frequency oscillation ichaitika.
3. Maitiro eFWD anokurumidza kukurumidza kudzoreredza nzira sezvo pa-nguva inova pfupi, uye kupfupika kweFWD pa-nguva kuchaita hombe dv / dt uye di / dt, kunyanya pasi pemamiriro epasi-zvino.Pamusoro pezvo, ma-high-voltage IGBT anopiwa akajeka mashoma diode turn-on time tonmin=10us.
Iwo chaiwo test waveforms mubepa akapa imwe referensi nguva shoma yekuita basa.
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