Kwenzekani ku-Microsecond lapho i-IGBT ivala

Njalo umaI-IGBTuma icisha, kwenzeka okuthile okunobudlova ngesikhathi esincane kakhulu.

Ukuqhathaniswa kwesimo se-voltage wave okubonisa i-IGBT turn-off spike ene-CRE snubber capacitor futhi engenayo

Ugesi ogeleza kudivayisi uyaphazamiseka. Amandla agcinwe ku-inductance yesekethe elahlekile awasekho lapho angaya khona. Akhishwa njengokuphakama kwamandla kagesi. Uma kungekho lutho olumunca lokho kuphakama kwamandla kagesi, angadlula amandla kagesi alinganiswe yi-IGBT futhi alimaze idivayisi.

Lena yinkinga ngqo i-snubber capacitor eyakhelwe ukuyixazulula. Futhi kufanelekile ukuyiqonda kahle, ngoba umehluko phakathi kwe-snubber capacitor enhle kanye ne-mediocre ubonakala njengoba idivayisi ihluleka izinyanga noma iminyaka kamuva, hhayi ngosuku lokuqala.

Umsebenzi we-Snubber Capacitor

A i-capacitor engenaluthoihlala ngaphesheya kwedivayisi yokushintsha futhi inikeza lawo mandla akhishwe endaweni ephephile ongaya kuyo.

Uma i-IGBT icima, i-capacitor imunca ugesi wesikhashana futhi ikhawulele ukuthi ugesi ukhuphuka ngokushesha kangakanani (dv/dt) kudivayisi yonke. Lowo msebenzi owodwa wenza izinto ezintathu ngesikhathi esisodwa: ucindezela ama-voltage spikes, unciphisa ukulahlekelwa kokushintsha, futhi ulungisa ugesi wesikhashana kanye noshintsho lwe-voltage olucindezela ingxenye esele yesekethe.

Ukuze lokhu kusebenze kahle, izakhiwo ezimbili zikagesi zibaluleke kakhulu kunanoma yini enye: ukumelana kochungechunge olulinganayo oluphansi (ESR) kanye ne-inductance yochungechunge olulinganayo oluphansi (ESL). I-ESR ephezulu noma i-ESL inciphisa impendulo ye-capacitor futhi ikhawulele ukuthi ingavimba kanjani i-transient esheshayo ngempumelelo. Yingakho futhi ifilimu ye-polypropylene yensimbi iyinto ekhethwayo kakhulu kwizicelo eziningi ezingelutho. Ihlanganisa i-ESR/ESL ephansi ne-dielectric eziphilisayo, ngakho-ke i-capacitor iyaqhubeka nokusebenza ngokwethembeka ngisho nangemva kokucindezeleka kwe-voltage okuphindaphindiwe.

NgaphakathiI-SMJ-P: I-CRE's Plastic Box IGBT Snubber Capacitor

I-SMJ-P ye-CRE iyi-capacitor yebhokisi lepulasitiki eyakhelwe ukuvikela i-IGBT, enama-lead ethusi afakwe nge-tin ukuze ifakwe kalula ngqo kwi-module ye-IGBT.

I-CRE SMJ-P plastic box IGBT snubber capacitor enezinti zethusi ezifakwe ithini

Amapharamitha obuchwepheshe abalulekile:

Ukwakhiwa ngokwako kwakhiwe ngendlela efanayo nokusebenza kukagesi. Ikesi lepulasitiki livalwe nge-resin, evikela ukugoqa kusuka emswakama kanye nokucindezeleka komshini. Kokubili ukucushwa kwe-axial kanye ne-radial lead kuyatholakala, ngakho umndeni ofanayo we-capacitor ungafanela izakhiwo ezahlukene zemodyuli ngaphandle kokuhlelwa kabusha ngokwezifiso njalo.

Imininingwane Iningi Lezihloko Ziyadlula: I-Lead Geometry Ibalulekile Njengomthamo

Iningii-capacitor engenaluthoOkuqukethwe kuphelela ku-“sebenzisa ifilimu ye-polypropylene, iyaziphilisa.” Lokho kuyiqiniso, kodwa ingxenye nje yendaba yobunjiniyela, futhi ingxenye enganqumi ukuthi ingxenye ethile isebenza yini kusekethe ethile.

Ingxenye yesibili yi-loop inductance. Inani le-capacitance lodwa aliqinisekisi i-voltage spike ephansi uma i-self-inductance ye-capacitor ihlala iphezulu, ngoba i-inductance esele ku-loop phakathi kwama-terminal kanye nokuxhumeka kwangaphakathi yikona okubangela i-voltage spike noma i-transient. Ngamanye amazwi, ingxenye ye-capacitance ephezulu enezintambo ezinde nezincane ingenza ingxenye encane ibe ngaphansi kwama-terminal amafushane, abanzi.

Umdwebo oqhathanisa ukugeleza kwe-loop phakathi kwama-terminal e-snubber capacitor ane-lead ende kanye ne-direct-mount

Yingakho futhi indlela yokufaka ibaluleke kakhulu kunokubonakala kwayo kudathashethi. Ama-capacitor aneziphetho ezibanzi, ezisicaba ezingafakwa ngqo kumojuli ye-IGBT athola ukuzilawula okuphansi kunezingxenye ezixhunywe ngezintambo ezinde ze-lead. Ama-lead ethusi e-SMJ-P afakwe nge-tin kanye nokukhetha ukucushwa kwe-axial noma kwe-radial kukhona ngenxa yalesi sizathu: ukugcina indlela yokuxhumana imfushane futhi uvumele i-capacitance elinganisiwe ukuthi ilethe ngempela ukuvikelwa kwe-dv/dt echazwe yona.

Isici sokuziphilisa sisabalulekile, ngokwehlukana. Ifilimu ye-polypropylene eyenziwe ngensimbi ehlangabezana nokuqhekeka kwe-dielectric yendawo ihlukanisa lelo phutha kuma-microsecond, esikhundleni sokwehluleka ngokuphelele, yingakho ifilimu ihlala iyi-dielectric ejwayelekile yalolu hlelo lokusebenza kunezinye izindlela ze-ceramic noma ze-electrolytic. Kodwa ukuziphilisa kanye ne-low loop inductance kuyizinkinga ezimbili ezahlukene zobunjiniyela, futhi i-snubber capacitor kufanele ilungise kokubili.

I-SMJ-P Ngaphakathi Kwebanga Le-CRE's Broader Snubber Capacitor

IIfomethi yebhokisi lepulasitiki le-SMJ-Pingenye yezindlela eziningana zokucushwa kwe-lead kanye ne-case CRE ezinikeza ukuvikelwa kokungafakwa kwe-IGBT kanye ne-GTO. Kuye ngesikhala sokufaka, ukuqondiswa kwe-lead, kanye nezidingo zokushisa, i-CRE ikhiqiza futhi izinhlobo ze-axial-lead kanye ne-Mylar-tape ezakhiwe kubuchwepheshe befilimu ye-polypropylene yensimbi efanayo futhi yakhelwe amazinga afanayo okusebenza kwe-ESR/ESL. Lokhu kusho ukuthi ithimba lokuklama lingahamba phakathi kwamafomethi njengoba ukwakheka kuthuthuka, ngaphandle kokufanelekela kabusha uhlelo lwe-dielectric oluyisisekelo kusukela ekuqaleni.

Indlela Onjiniyela Abaqinisekisa Ngayo Ukukhetha Kwe-Snubber Capacitor

Isilinganiso somthamo kanye ne-voltage kudathashethi akwanele ukuqinisekisa ukuthi i-capacitor ye-snubber izosebenza kusekethe ethile. Indlela ejwayelekile yokuqinisekisa, ebhalwe yi-SEMIKRON kumanothi ayo ohlelo lokusebenza lwe-IGBT, ukukala i-waveform ye-voltage ye-collector-emitter yangempela ekucimeni, ene-capacitor ye-snubber noma engenayo, nokuqinisekisa ukuthi i-peak ihlala ngaphakathi kwe-voltage yokuvimba elinganisiwe ye-IGBT ngaphansi kwezimo ezimbi kakhulu. Ngemva kokucima, i-current iyashintsha iye kwi-capacitor ye-snubber, ikhiqize i-current peak ku-switching instant, kulandelwe yi-oscillation encishisiwe phakathi kwe-capacitor ye-snubber kanye ne-DC-link, kanye nemvamisa ye-oscillation esethwe yi-parasitic inductance yebha yebhasi kanye nenani le-snubber capacitor.

Lokhu kugcizelela okufanayo ku-lead geometry kanye ne-direct-mount terminal hardware njenge-primary design variable, kunokuba kube yinto ecatshangwa kamuva, kuphindelelwa ezincwadini zokuklama ama-electronics kagesi ezisakazwa kabanzi, okuhlanganisa nereferensi yokuklama kaRudy Severns ekhishwe yiCornell Dubilier. I-physics eyisisekelo iphinde yahlelwa ngokusemthethweni ku-IEC 61071, ama-capacitor asezingeni lomhlaba wonke alawula ama-electronics kagesi, i-SMJ-P eyenzelwe ukuhlangabezana nawo. Iphuzu elikuyo yonke le mithombo liyavumelana:umgomo akuyona nje inani le-capacitance ephepheni le-spec, kodwa ukwehla okulinganiselwe, okungaphindaphindeka kwe-peak voltage lapho ivaliwe.

Lapho Ama-Capacitors e-SMJ-P Asetshenziswa Khona

Umdwebo wesekethe ye-IGBT ene-half-bridge ene-snubber capacitor C3 exhunywe kuzo zonke iziteshi zebhasi ze-DC.

Ama-capacitor e-snubber awayona ingxenye ebalulekile. Avela noma kuphi lapho idivayisi yokushintsha ugesi idinga ukuvikelwa esenzweni sayo sokushintsha:

• Ama-inverter kanye nama-motor drive, lapho ama-IGBT eshintsha njalo futhi edinga ukuvikelwa kwe-dv/dt okuqhubekayo

•Ama-elekthronikhi kagesi ezimoto zikagesi, lapho ukusebenza kahle kokushintsha kanye nokuphila isikhathi eside kwezingxenye kuthinta ngqo ububanzi kanye nokuthembeka

•Izinhlelo zamandla avuselelekayo, kufaka phakathi ama-solar inverters, lapho ukucindezelwa kwe-voltage spike kuvikela amadivayisi okushintsha amandla aphezulu eminyakeni eminingi yokusebenza

•Izinto zokulungisa,Ama-SVCkanye nezinsiza zikagesi zesitimela, lapho amaza okushaya kwenhliziyo aphezulu kanye nemijikelezo yomsebenzi odingayo kwenza ukusebenza kwe-ESR kanye ne-ESL kubaluleke kakhulu

Intambo efanayo kuzo zonke lezi zinhlelo zokusebenza iyafana: amadivayisi okushintsha akhiqiza ama-transient, futhi okuthile kufanele kuwamunce kahle, umjikelezo nomjikelezo, impilo yonke yesistimu.

Kungani Ukukhetha Izinto Zokusebenza Nokukhiqiza Kuhlangana Ngokuhamba Kwesikhathi

Umsebenzi we-snubber capacitor ubonakala ulula kudathashethi. Empeleni, ukusebenza kunqunywa imininingwane engabonakali kuze kube yilapho uhlelo selusebenze iminyaka eminingi: ukuthi i-dielectric self-healing ihlala kanjani ngemva kokucindezeleka, ukuthi i-ESR ne-ESL zilawulwa kanjani ngokuqinile kulo lonke iqembu lokukhiqiza, nokuthi ukumelana kokushisa kubambelela yini kulo lonke izinga lokushisa eliphelele kunokuba kube nje ekushiseni kwegumbi.

Yingakho i-SMJ-P ye-CRE ihlobanisa isilinganiso sayo sokulinda isikhathi sokuphila samahora ayi-100,000 nesimo esithile sokushisa kwe-hotspot (≤85°C), kunokuba isho njengenombolo ejwayelekile, nokuthi kungani ukumelana nokushisa kuchazwa ngokwehlukana ngebanga le-capacitance kunokuba kube yisibalo esisodwa. Lezi yizinhlobo zezincazelo ezibalulekile kunjiniyela oqinisekisa umklamo, hhayi nje isimangalo sokumaketha.

Imibuzo Evame Ukubuzwa: Ukukhethwa Kwe-IGBT Snubber Capacitor

Q1：KuyiniI-capacitor ye-IGBT snubberisetshenziselwa? 

I-capacitor ye-IGBT engasebenzi kahle icindezela ama-voltage spikes akhiqizwayo lapho i-IGBT icima, ivikela idivayisi ekudluleni i-voltage yayo yokuvimba elinganiselwe. I-capacitor yefilimu ye-polypropylene ye-SMJ-P ye-CRE yenzelwe le njongo, enebanga le-voltage elilinganiselwe elisuka ku-700V DC kuya ku-3000V DC.

Q2：Ngingamkhetha kanjani umenzi we-snubber capacitor ofanele? 

Funa umenzi ohlinzeka ngama-capacitor amafilimu ane-ESR/ESL ephansi, izitifiketi eziqashelwayo (IEC 61071, UL94V-0), kanye nezinketho zomthamo noma i-voltage ezenziwe ngokwezifiso.I-CREungumenzi we-capacitor yamafilimu ohlinzeka nge-DC-Link,Ukuzidla ngokweqile kwe-IGBT, kanye nama-capacitor e-EMC-filter e-electronics yamandla, amandla avuselelekayo, kanye nezinhlelo zokusebenza zokuhamba ngesitimela, okukhona kokubili ukucushwa kwe-axial kanye ne-radial lead.

Q3：Yini eyenza i-capacitor yefilimu ye-polypropylene ibe ngcono kunezinye izinhlobo ze-capacitor ezingenalutho? 

Ifilimu ye-polypropylene enensimbi inikeza i-ESR/ESL ephansi, izakhiwo ze-dielectric eziziphilisayo, kanye nokusebenza okuzinzile ebangeni elibanzi lokushisa, okwenza kube yi-dielectric ejwayelekile yokusetshenziswa kwe-snubber uma kuqhathaniswa nezinye izindlela ze-electrolytic noma ze-ceramic. I-SMJ-P ye-CRE isebenza kusukela ku--40°C kuya ku-+85°C ngobude besikhathi sokuphila samahora ayi-100,000.

Imibhalo ephelele yobuchwepheshe ye-SMJ-P iyatholakala lapha: https://www.crecapacitors.com/IGBT-GTO-Snubber-Capacitors-pl47325307.html

Izinkomba:

1. KHULA AMANDLA AMASHA, “Ibhokisi lepulasitiki le-IGBT Snubber Capacitor SMJ-P,” Ishidi Ledatha Lomkhiqizo. （https://www.crecapacitors.com/IGBT-GTO-Snubber-Capacitors-pl47325307.html）

2. I-Semikron Danfoss, “Ukulinganiswa Kwevolumu Ephakeme Ye-IGBT kanye Nencazelo Yesipikha Se-Snubber, “Inothi Lokusebenza AN 07-006.

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

3. Severns, Rudy. “Umklamo wama-Snubbers wama-Power Circuits.” Inothi Lesicelo se-Cornell Dubilier. （https://www.cde.com/resources/technical-papers/design.pdf）

Imininingwane yobuchwepheshe ibonisa idatha eshicilelwe ngesikhathi sokubhala. Abafundi kufanele baqinisekise izilinganiso zamanje uma kuqhathaniswa nedatha yakamuva yomenzi ngaphambi kokusetshenziswa komklamo wokugcina.