Narrow Pulse Phenomenon ke eng
Joalo ka mofuta oa switch ea matla, IGBT e hloka nako e itseng ea karabelo ho tloha ho lets'oao la boemo ba heke ho ea ts'ebetsong ea ho fetola sesebelisoa, joalo ka ha ho le bonolo ho petetsa letsoho ka potlako haholo bophelong ho fetola heke, molumo o mokhuts'oane oa ho bula ho ka baka holimo haholo. maqhubu a motlakase kapa mathata a ho sisinyeha ha maqhubu a phahameng.Ketsahalo ena e etsahala ka mokhoa o hlokang thuso nako le nako ha IGBT e tsamaisoa ke lipontšo tse fetotsoeng tsa PWM tse phahameng haholo.Ha potoloho ea mosebetsi e le nyane, ho bonolo ho hlahisa li-pulses tse moqotetsane, 'me litšobotsi tsa ho hlaphoheloa tsa IGBT anti-parallel renewal diode FWD li potlaka nakong ea nchafatso e thata.Ho 1700V/1000A IGBT4 E4, tlhaloso ka mocheso mateano Tvj.op = 150 ℃, nako switjha tdon = 0.6us, tr = 0.12us le tdoff = 1.3us, tf = 0.59us, e ke ke ea fokotseha ka bophara pulse bophara ho feta kakaretso ea nako e behiloeng ea ho fetoha.Ha e le hantle, ka lebaka la litšobotsi tse fapaneng tsa mojaro tse kang photovoltaic le polokelo ea matla haholo ha matla a +/ - 1, molumo o moqotetsane o tla hlaha haufi le ntlha ea hona joale ea zero, joalo ka jenereithara ea matla a sebetsang a SVG, filthara e sebetsang ea APF ea matla a 0, pulse e moqotetsane e tla hlaha haufi le palo e kholo ea mojaro hona joale, ts'ebeliso ea sebele ea hona joale haufi le ntlha ea zero e ka 'na ea hlaha ka sekhahla sa maqhubu a maqhubu a phahameng, mathata a EMI a hlaha.
Narrow pulse phenomenon ea sesosa
Ho tloha litsing tsa motheo tsa semiconductor, lebaka le ka sehloohong la ketsahalo e moqotetsane ea pulse ke ka lebaka la IGBT kapa FWD e sa tsoa qala ho bulela, eseng hang-hang e tlatsitsoeng ke bajari, ha sephethephethe se hasana ha se koala IGBT kapa chip ea diode, ha e bapisoa le mofani oa thepa ka ho feletseng. e tletse ka mor'a ho koala, di / dt e ka eketseha.Liphetoho tse phahameng tse tsamaisanang le IGBT li tla hlahisoa ka tlas'a commutation stray inductance, e ka 'nang ea baka phetoho ea tšohanyetso ho diode reverse recovery current, kahoo ketsahalo ea snap-off.Leha ho le joalo, ketsahalo ena e amana haufi-ufi le theknoloji ea chip ea IGBT le FWD, motlakase oa lisebelisoa le hona joale.
Taba ea pele, re tlameha ho qala ho tloha ho "double pulse schematic", setšoantšo se latelang se bonts'a logic ea switching ea IGBT gate drive voltage, hona joale le voltage.Ho tloha mohopolong oa ho khanna oa IGBT, e ka aroloa ka pulse off time toff, e hlileng e lumellanang le nako e ntle ea conduction ea diode FWD, e nang le tšusumetso e kholo tlhōrōng ea ho hlaphoheloa ha morao-rao le lebelo la ho hlaphoheloa, joalo ka ntlha A. setšoantšong, matla a phahameng a tlhōrō ea ho tsosolosa ka morao a ke ke a feta moeli oa FWD SOA;le moqotetsane pulse turn-on time ton, sena se na le tšusumetso e batlang e le kholo ts'ebetsong ea ho tima IGBT, joalo ka ntlha ea B setšoantšong, haholo-holo li-spikes tsa motlakase oa ho tima IGBT le li-oscillations tsa morao-rao tse latelang.
Empa ho tima sesebelisoa se moqotetsane haholo sa pulse ho tla baka mathata afe?Ha e le hantle, moeli o fokolang oa bophara ba pulse o utloahalang ke ofe?Mathata ana a thata ho fumana liforomo tsa bokahohleng ho baloa ka kotloloho ka likhopolo le liforomo, tlhahlobo ea theory le lipatlisiso le tsona li batla li le nyane.Ho tsoa ho sebopeho sa 'nete sa tlhahlobo le liphetho ho bona graph ho bua, tlhahlobo le kakaretso ea litšoaneleho le lintho tse tloaelehileng tsa ts'ebeliso, ho thusa haholoanyane ho u thusa ho utloisisa ketsahalo ena, ebe o ntlafatsa moralo ho qoba mathata.
IGBT narrow pulse turn-on
IGBT e le sesebelisoa se sebetsang, ho sebelisa linyeoe tsa sebele ho bona kerafo ho bua ka ketsahalo ena ho kholisa ho feta, ho ba le thepa e omileng ea lintho tse bonahalang.
U sebelisa module ea matla a phahameng IGBT4 PrimePACK™ FF1000R17IE4 e le ntho ea teko, lisebelisoa tsa ho tima lisebelisoa ha lithane li fetoha tlas'a maemo a Vce = 800V, Ic=500A, Rg=1.7Ω Vge =+/-15V, Ta= 25 ℃, bofubelu ke 'mokelli Ic, boputsoa ke motlakase lipheletsong tse peli tsa IGBT Vce, botala ke Vge ea koloi.Vge.pulse ton e fokotseha ho tloha ho 2us ho ea ho 1.3us ho bona phetoho ea sekhahla sena sa motlakase Vcep, setšoantšo se latelang se bonts'a tlhahlobo ea maqhubu a teko butle-butle ho bona ts'ebetso ea phetoho, haholo-holo e bontšitsoeng ka selikalikoe.
Ha ton e fetola Ic ea hajoale, karolong ea Vce ho bona phetoho ea litšobotsi tse bakoang ke tone.Li-graph tsa ka ho le letšehali le tse ka ho le letona li bontša li-spikes tsa voltage Vce_peak ka maqhubu a fapaneng Ic tlas'a maemo a tšoanang a Vce = 800V le 1000V ka ho latellana.ho tsoa liphethong tse fapaneng tsa liteko, ton e na le phello e batlang e le nyane ho li-voltage spikes Vce_peak ka maqhubu a manyane;ha nako ea ho tima e ntse e eketseha, ho tima pulse e moqotetsane ho atisa ho fetoha ka tšohanyetso hona joale 'me ka mor'a moo ho baka li-spikes tse phahameng.Ho nka li-graph tse ka ho le letšehali le tse nepahetseng e le lihokahanyo bakeng sa ho bapisa, ton e na le tšusumetso e kholo mosebetsing oa ho koala ha Vce le Ic ea hona joale e phahame, 'me ho ka etsahala hore ho be le phetoho ea tšohanyetso ea hona joale.Ho tloha tekong ho bona mohlala ona FF1000R17IE4, bonyane ba pulse tonne nako e loketseng e seng ka tlase ho 3us.
Na ho na le phapang pakeng tsa ts'ebetso ea li-modules tse phahameng tsa hona joale le li-module tse tlaase tsa hona joale tabeng ee?Nka FF450R12ME3 mojule oa matla a mahareng e le mohlala, setšoantšo se latelang se bonts'a overshoot ea voltage ha tonne e fetoha bakeng sa maqhubu a fapaneng a liteko Ic.
Liphetho tse ts'oanang, phello ea ton ho overshoot ea "turn-off voltage" ha e na thuso maemong a tlase a tlase ho 1/10 * Ic.Ha hona joale ho eketsoa ho ea hona joale e lekantsoeng ea 450A kapa esita le 2 * Ic ea hona joale ea 900A, ho feta ha motlakase ka bophara ba lithane ho hlakile haholo.E le ho leka ts'ebetso ea litšoaneleho tsa maemo a ts'ebetso tlas'a maemo a feteletseng, makhetlo a 3 ho feta 1350A, li-voltage spikes li fetisitse motlakase o thibelang, li kenngoa ka har'a chip ka tekanyo e itseng ea motlakase, ntle le bophara ba lithane. .
Setšoantšo se latelang se bontša papiso ea maqhubu a maqhubu a ton=1us le 20us ho Vce=700V le Ic=900A.Ho tloha tekong ea 'nete, bophara ba mojule ho ton=1us bo se bo qalile ho sisinyeha,' me sekhahla sa voltage Vcep se phahame ka 80V ho feta ton=20us.Ka hona, ho kgothaletswa hore nako e fokolang ea ho otla ha ea lokela ho ba ka tlase ho 1us.
FWD narrow pulse turn- on
Sebakeng sa halofo ea borokho, IGBT-turn-off pulse toff e lumellana le tone ea nako ea ho bulela FWD.Palo e ka tlase e bonts'a hore ha nako ea ho bulela FWD e le ka tlase ho 2us, tlhōrō ea morao-rao ea FWD e tla eketseha ka nako e lekantsoeng ea 450A.Ha toff e le kholo ho feta 2us, tlhōrō ea FWD ea morao-rao ea ho hlaphoheloa ha e le hantle ha e fetohe.
IGBT5 PrimePACK™3 + FF1800R17IP5 ho shebella litšobotsi tsa diode tse matla a phahameng, haholo-holo tlas'a maemo a tlaase a hona joale a nang le liphetoho tsa lithane, mola o latelang o bontša maemo a VR = 900V, 1200V, maemong a manyenyane a hona joale IF = 20A a bapisoa ka ho toba. ea maqhubu a mabeli, ho hlakile hore ha ton = 3us, oscilloscope e hlōlehile ho tšoara The amplitude of this high frequency oscillation.Sena se boetse se paka hore ho sisinyeha ha leqhubu le phahameng ho feta ntlha ea zero lits'ebetsong tsa lisebelisoa tsa matla a phahameng le ts'ebetso ea nako e khuts'oane ea FWD ea ho khutlisa e amanang haholo.
Ka mor'a ho sheba mokhoa o hlakileng oa maqhubu, sebelisa lintlha tsa sebele ho tsoela pele ho lekanya le ho bapisa ts'ebetso ena.dv/dt le di/dt tsa diode li fapana ho ea ka toff, 'me ha nako ea conduction ea FWD e nyane, litšobotsi tsa eona tse ka morao li tla fetoha kapele.Ha VR e phahame ka lipheletsong tse peli tsa FWD, ha lebelo la diode conduction le ntse le fokotseha, lebelo la eona la ho hlaphoheloa la diode le tla potlakisa, ka ho khetheha ho sheba data ka ton = 3us maemo.
VR = 1200V ha.
dv/dt=44.3kV/us;di/dt=14kA/us.
Ho VR=900V.
dv/dt=32.1kV/us;di/dt=12.9kA/us.
Ka lebaka la ton = 3us, waveform high-frequency oscillation e matla haholo, 'me ka nģ'ane ho sebaka se sebetsang se sireletsehileng sa diode, nako ea nako ha ea lokela ho ba ka tlase ho 3us ho tloha ponong ea diode FWD.
Ka litlhaloso tsa high-voltage 3.3kV IGBT ka holimo, FWD forward conduction time ton e hlalositsoe ka ho hlaka le ho hlokahala, ho nka 2400A/3.3kV HE3 e le mohlala, nako e tlaase ea diode conduction ea 10us e fanoe ka ho hlaka e le moeli, e leng haholo hobane tsamaiso ea potoloho ea stray inductance lits'ebetsong tsa matla a phahameng e batla e le khōlō, nako ea ho fetola e batla e le telele, 'me e khutšoanyane nakong ea ho bula sesebelisoa Ho bonolo ho feta tekanyo e phahameng e lumelletsoeng ea tšebeliso ea matla a diode PRQM.
Ho tsoa mefuteng ea 'nete ea liteko le liphetho tsa mojule, sheba li-graph 'me u bue ka kakaretso ea mantlha.
1. phello ea pulse width ton ho IGBT tima e nyenyane ea hona joale (hoo e ka bang 1/10 * Ic) e nyenyane 'me e hlile e ka hlokomolohuoa.
2. IGBT e na le ts'epo e itseng ho pulse width ton ha e tima matla a holimo, e nyenyane ea tonne e phahameng ea voltage spike V, 'me mokhoa oa ho tima hona joale o tla fetoha ka tšohanyetso' me ho tla etsahala oscillation e phahameng ea maqhubu.
3. Litšobotsi tsa FWD li potlakisa ts'ebetso ea ho hlaphoheloa ka morao ha nako e ntse e e-ba khutšoanyane, 'me e khuts'oane ea FWD ka nako e tla baka dv / dt le di / dt e kholo, haholo-holo tlas'a maemo a tlaase.Ho feta moo, li-IGBT tse nang le matla a phahameng a matla li fuoa nako e hlakileng ea ho bulela diode tonmin=10us.
Liphetoho tsa 'nete tsa liteko pampiring li fane ka nako e nyane ea ho bapala karolo.
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