Kodi Chimachitika ndi Chiyani mu Microsecond IGBT Ikazimitsidwa?

Nthawi iliyonseIGBTZikangotha, chinachake chachiwawa chimachitika pang'onopang'ono.

Kuyerekeza kwa mafunde a voliyumu kukuwonetsa kukwera kwa IGBT turn-off spike yokhala ndi ndi yopanda CRE snubber capacitor

Mphamvu yamagetsi yomwe ikuyenda mu chipangizocho imasokonekera. Mphamvu yomwe imasungidwa mu inductance yosochera ya dera ilibe kolowera. Imatuluka ngati kukwera kwa magetsi. Ngati palibe chomwe chimayamwa kukwera kumeneko, imatha kupitirira mphamvu ya IGBT ndikuwononga chipangizocho.

Ili ndiye vuto lenileni lomwe capacitor ya snubber imapangidwira kuthetsa. Ndipo ndikofunikira kumvetsetsa bwino, chifukwa kusiyana pakati pa capacitor yabwino ya snubber ndi yapakatikati kumawonekera ngati chipangizo chalephera miyezi ingapo kapena zaka mtsogolo, osati tsiku loyamba.

Ntchito ya Snubber Capacitor

A capacitor yochepetsera fungoimakhala pambali pa chipangizo chosinthira ndipo imapatsa mphamvu yotulutsidwayo malo otetezeka kupitako.

IGBT ikazima, capacitor imayamwa mphamvu yamagetsi ya transient current ndikuchepetsa kuchuluka kwa mphamvu yamagetsi yomwe imakwera (dv/dt) pa chipangizocho. Ntchito imodzi imeneyi imachita zinthu zitatu nthawi imodzi: imaletsa kukwera kwa mphamvu yamagetsi, imachepetsa kutayika kwa switching, ndipo imasintha mphamvu yamagetsi yadzidzidzi ndi kusintha kwa mphamvu yamagetsi komwe kumakhudza gawo lonse lamagetsi.

Kuti izi zigwire ntchito bwino, zinthu ziwiri zamagetsi ndizofunikira kwambiri kuposa china chilichonse: kukana kofanana ndi kotsika (ESR) ndi kutsika kofanana ndi kotsika (ESL). ESR kapena ESL yapamwamba imachedwetsa kuyankha kwa capacitor ndikuchepetsa momwe ingachepetsere kusinthasintha kwachangu. Ichi ndichifukwa chake filimu ya polypropylene yokhala ndi metallized ndi chinthu chomwe chimasankhidwa kwambiri pa ntchito zambiri zosasamala. Imaphatikiza ESR/ESL yotsika ndi dielectric yodzichiritsa yokha, kotero capacitor imapitiliza kugwira ntchito moyenera ngakhale itakhala ndi mphamvu yobwerezabwereza yamagetsi.

Mkati mwaSMJ-P: CRE's Plast Box IGBT Snubber Capacitor

SMJ-P ya CRE ndi capacitor yopangidwa ndi bokosi la pulasitiki yopangidwa kuti iteteze IGBT, yokhala ndi zitsulo zophimbidwa ndi mkuwa kuti iikidwe mosavuta pa module ya IGBT.

Bokosi la pulasitiki la CRE SMJ-P IGBT snubber capacitor yokhala ndi zingwe zamkuwa zophimbidwa ndi tin

Magawo ofunikira aukadaulo:

Kapangidwe kake kamamangidwa motsatira mfundo yofanana ndi momwe magetsi amagwirira ntchito. Chikwama cha pulasitiki chimatsekedwa ndi utomoni, womwe umateteza kupindika ku chinyezi ndi kupsinjika kwa makina. Makonzedwe onse a axial ndi radial lead alipo, kotero banja lomwelo la capacitor limatha kuyika mapangidwe osiyanasiyana a module popanda kusinthidwa nthawi iliyonse.

Tsatanetsatane Nkhani Zambiri Zodumpha: Lead Geometry Ndi Yofunika Monga Mphamvu

Ambiricapacitor yochepetsera fungoZomwe zili mkati mwake zimathera pa "gwiritsani ntchito filimu ya polypropylene, imadzichiritsa yokha." Ndi zoona, koma ndi theka lokha la nkhani ya uinjiniya, ndipo ndi theka lomwe silimasankha ngati gawo lina likugwira ntchito mu dera linalake.

Gawo lina ndi loop inductance. Kuchuluka kwa capacitance kokha sikutsimikizira kukwera kwa mphamvu yamagetsi kochepa ngati capacitor ikukhazikika yokha, chifukwa kukwera kotsala mu loop pakati pa ma terminal ndi maulumikizidwe amkati ndi komwe kumayambitsa kukwera kwa mphamvu yamagetsi kapena transient. Mwanjira ina, gawo la capacitance yayikulu yokhala ndi ma lead ataliatali komanso owonda lingathe kuchita bwino gawo laling'ono ndi ma terminal afupiafupi komanso otakata.

Chithunzi choyerekeza kusinthasintha kwa kuzungulira pakati pa malo olumikizira magetsi a capacitor okhala ndi lead yayitali ndi okhazikika mwachindunji

Ichi ndichifukwa chake njira yoyikira ndi yofunika kwambiri kuposa momwe imaonekera pa datasheet. Ma capacitor okhala ndi ma terminals otakata, osalala omwe amatha kukulungidwa mwachindunji pa IGBT module amakhala ndi njira yodziyimira yokha yochepa kuposa zigawo zolumikizidwa kudzera mu mawaya atali a lead. Ma lead a SMJ-P okhala ndi tin-plated copper insert ndi kusankha kwa axial kapena radial configuration alipo pachifukwa ichi: kuti njira yolumikizira ikhale yochepa ndikulola capacitance yoyesedwa kuti ipereke chitetezo cha dv/dt chomwe chaperekedwa.

Kapangidwe ka kudzichiritsa kokha n'kofunikabe, padera. Filimu ya polypropylene yokhala ndi chitsulo yomwe imakumana ndi kuwonongeka kwa dielectric komweko imachotsa cholakwikacho mu microseconds, m'malo molephera kwathunthu, ndichifukwa chake filimuyo imakhalabe dielectric yokhazikika pakugwiritsa ntchito uku kuposa njira zina za ceramic kapena electrolytic. Koma kudzichiritsa yokha ndi kutsika kwa lupu ndi mavuto awiri osiyana aukadaulo, ndipo capacitor yonyowa iyenera kuchita zonse ziwiri bwino.

SMJ-P Mkati mwa CRE's Broader Snubber Capacitor Range

TheMtundu wa bokosi la pulasitiki la SMJ-Pndi imodzi mwa makonzedwe angapo a lead ndi kesi omwe CRE imapereka kuti iteteze IGBT ndi GTO snubber. Kutengera malo okwerera, momwe lead imayendera, komanso zofunikira pa kutentha, CRE imapanganso mitundu ya axial-lead ndi Mylar-tape yomangidwa paukadaulo womwewo wa polypropylene film ndipo idapangidwa mogwirizana ndi miyezo yofanana ya ESR/ESL. Izi zikutanthauza kuti gulu lopanga lingasunthe pakati pa mafomati pamene kapangidwe kake kakusintha, popanda kubwezeretsanso dongosolo la dielectric kuyambira pachiyambi.

Momwe Mainjiniya Amatsimikizira Kusankha kwa Snubber Capacitor

Kuchuluka kwa mphamvu ndi kuchuluka kwa mphamvu zamagetsi pa datasheet sikukwanira kutsimikizira kuti capacitor ya snubber idzagwira ntchito mu dera linalake. Njira yodziwika bwino yotsimikizira, yolembedwa ndi SEMIKRON mu zolemba zake za IGBT application, ndiyo kuyeza mafunde enieni a voltage ya collector-emitter pa turn-off, yokhala ndi kapena yopanda snubber capacitor pamalopo, ndikutsimikizira kuti peak imakhala mkati mwa voltage yoletsa ya IGBT pansi pa zovuta kwambiri. Pambuyo pa turn-off, mphamvu zamagetsi zimasinthasintha kupita ku snubber capacitor, ndikupanga current peak pa switching instant, kutsatiridwa ndi damped oscillation pakati pa snubber capacitor ndi DC-link, ndi ma frequency a oscillation omwe amakhazikitsidwa ndi inductance ya parasitic ya bus bar ndi mtengo wa snubber capacitor.

Kugogomezera komweku pa geometry ya lead ndi zida zoyimilira mwachindunji monga chosinthira chachikulu cha kapangidwe, osati lingaliro lomaliza, kukufotokozedwanso m'mabuku ofalitsidwa kwambiri opanga zamagetsi zamagetsi, kuphatikiza buku la Rudy Severns lonena za kapangidwe kake lofalitsidwa ndi Cornell Dubilier. Fiziki yoyambira idakhazikitsidwanso mu IEC 61071, ma capacitor apadziko lonse lapansi omwe amalamulira zamagetsi zamagetsi, omwe SMJ-P idapangidwa kuti ikwaniritse. Mfundo yomwe ili m'magwero onsewa ndi yofanana:Cholinga chake si kungoyang'ana kuchuluka kwa mphamvu yamagetsi pa pepala lofotokozera, koma ndi kuchepa kwa mphamvu yamagetsi yomwe imayesedwa mobwerezabwereza ikazima.

Kumene Ma Capacitors a SMJ-P Amagwiritsidwa Ntchito

Chithunzi cha theka la mlatho wa IGBT chokhala ndi snubber capacitor C3 cholumikizidwa kudutsa njanji za basi za DC.

Ma capacitor a Snubber si gawo lapadera. Amaonekera kulikonse komwe chipangizo chosinthira magetsi chikufunika chitetezo ku kusintha kwake:

• Ma inverter ndi ma motor drive, komwe ma IGBT amasinthana mosalekeza ndipo amafunika chitetezo cha dv/dt chokhazikika

•Zamagetsi zamagetsi zamagalimoto zamagetsi, komwe kusintha bwino kwa zinthu ndi moyo wautali wa zinthu zimakhudza mwachindunji kuchuluka ndi kudalirika kwa zinthu

•Machitidwe a mphamvu zongowonjezwdwanso, kuphatikizapo ma inverter a dzuwa, komwe kuletsa kukwera kwa magetsi kumateteza zida zosinthira zamagetsi amphamvu kwambiri kwa zaka zambiri zikugwira ntchito

•Zokonzanso,Ma SVC, ndi magetsi a sitimayo, komwe mafunde amphamvu komanso kuzungulira kwa ntchito yovuta kumapangitsa kuti magwiridwe antchito a ESR ndi ESL akhale ofunika kwambiri.

Ulusi wofanana pa mapulogalamu onsewa ndi womwewo: zipangizo zosinthira zimapanga zinthu zosinthika, ndipo china chake chiyenera kuzitenga bwino, kuzungulira kuzungulira, kwa moyo wonse wa dongosololi.

Chifukwa Chake Zosankha Zazinthu ndi Zopanga Zimayenderana Pakapita Nthawi

Ntchito ya capacitor yodzipatula imawoneka yosavuta pa datasheet. M'machitidwe, magwiridwe antchito amatsimikiziridwa ndi tsatanetsatane womwe sungawonekere mpaka dongosololi litakhala likugwira ntchito kwa zaka zambiri: momwe dielectric imachiritsira yokha pambuyo pa kupsinjika, momwe ESR ndi ESL zimalamulidwira mwamphamvu pa gulu lonse lopanga, komanso ngati kukana kwa insulation kumapitilira kutentha konse m'malo mongokhala kutentha kwa chipinda.

Ichi ndichifukwa chake SMJ-P ya CRE imagwirizanitsa kuchuluka kwa nthawi yomwe munthu amakhala ndi moyo kwa maola 100,000 ndi kutentha kwapadera (≤85°C), m'malo moitchula ngati nambala yeniyeni, komanso chifukwa chake kukana kwa kutenthetsa kumatchulidwa padera ndi kuchuluka kwa capacitance m'malo mwa chifaniziro chimodzi. Izi ndi mitundu ya ma specifications omwe ndi ofunika kwa injiniya wotsimikizira kapangidwe kake, osati kungonena malonda okha.

Mafunso Ofunsidwa Kawirikawiri: Kusankha kwa IGBT Snubber Capacitor

Q1：Kodi ndi chiyaniIGBT snubber capacitorimagwiritsidwa ntchito pa? 

Kachipangizo ka IGBT kochepetsa mphamvu zamagetsi kamaletsa kukwera kwa mphamvu zamagetsi komwe kumachitika pamene IGBT yazimitsa, zomwe zimateteza chipangizocho kuti chisapitirire mphamvu yake yoletsa mphamvu. Kachipangizo ka filimu ya polypropylene ya CRE ka SMJ-P kamapangidwira izi, ndipo mphamvu yake ndi kuyambira 700V DC mpaka 3000V DC.

Q2：Kodi ndingasankhe bwanji wopanga makina oyenera a snubber capacitor? 

Yang'anani wopanga yemwe amapereka ma capacitor a mafilimu otsika a ESR/ESL, ziphaso zodziwika bwino (IEC 61071, UL94V-0), ndi zosankha za capacitance kapena voltage zomwe mungasankhe.CREndi wopanga ma capacitor a filimu omwe amapereka DC-Link,Wonyoza IGBT, ndi ma capacitor a EMC-filter amagetsi amphamvu, mphamvu zongowonjezwdwanso, ndi ntchito zoyendera njanji, zomwe zili ndi ma axial ndi radial lead configurations omwe alipo.

Q3：Kodi n’chiyani chimapangitsa kuti capacitor ya filimu ya polypropylene ikhale yabwino kuposa mitundu ina ya capacitor ya snubber? 

Filimu ya polypropylene yachitsulo imapereka ESR/ESL yotsika, mphamvu ya dielectric yodzichiritsa yokha, komanso magwiridwe antchito okhazikika pa kutentha kwakukulu, zomwe zimapangitsa kuti ikhale dielectric yokhazikika yogwiritsidwa ntchito mosasamala poyerekeza ndi njira zina za electrolytic kapena ceramic. SMJ-P ya CRE imagwira ntchito kuyambira -40°C mpaka +85°C yokhala ndi moyo wautali wa maola 100,000.

Zolemba zonse zaukadaulo za SMJ-P zikupezeka apa: https://www.crecapacitors.com/IGBT-GTO-Snubber-Capacitors-pl47325307.html

Maumboni:

1. CRE MPHAMVU YATSOPANO, “Bokosi la Pulasitiki la IGBT Snubber Capacitor SMJ-P,” Deta ya Zamalonda. （https://www.crecapacitors.com/IGBT-GTO-Snubber-Capacitors-pl47325307.html）

2. Semikron Danfoss, “Kuyeza kwa IGBT Peak Voltage ndi Snubber Capacitor Specification, “Chidziwitso cha Kugwiritsa Ntchito AN 07-006.

（https://assets.danfoss.com/documents/latest/444044/AB501644922487en-000201.pdf）

3. Severns, Rudy. “Kapangidwe ka Snubbers ka Power Circuits.” Cornell Dubilier Application Note. （https://www.cde.com/resources/technical-papers/design.pdf）

Mafotokozedwe aukadaulo akuwonetsa deta yofalitsidwa panthawi yolemba. Owerenga ayenera kutsimikizira ziwerengero zamakono poyerekeza ndi pepala laposachedwa la wopanga asanagwiritse ntchito kapangidwe komaliza.