Abin da ke faruwa a cikin Microsecond lokacin da IGBT ya kashe

Duk lokacin daIGBTyana kashewa, wani abu mai tayar da hankali yana faruwa a cikin ɗan gajeren lokaci.

Kwatanta yanayin ƙarfin lantarki wanda ke nuna ƙarar kashe IGBT tare da kuma ba tare da capacitor mai amfani da CRE ba

Wutar lantarki da ke ratsa na'urar tana katsewa. Ƙarfin da aka adana a cikin inductance na da'irar ba shi da inda zai je. Yana fitowa a matsayin ƙarfin lantarki. Idan babu abin da ya sha wannan ƙarfin, zai iya wuce ƙarfin lantarki da aka ƙima na IGBT kuma ya lalata na'urar.

Wannan ita ce ainihin matsalar da aka gina snubber capacitor don magancewa. Kuma ya kamata a fahimci yadda ya kamata, domin bambancin da ke tsakanin snubber capacitor mai kyau da matsakaici yana bayyana ne yayin da na'urar ke lalacewa watanni ko shekaru a jere, ba a rana ta farko ba.

Aikin Mai Ƙarfin Haske (Snubber Capacitor)

A capacitor mai hana ruwa guduyana zaune a kan na'urar sauyawa kuma yana ba da wutar lantarki da aka saki a wani wuri mai aminci don zuwa.

Idan IGBT ya kashe, capacitor ɗin yana shan wutar lantarki ta wucin gadi kuma yana iyakance saurin tashin wutar lantarki (dv/dt) a cikin na'urar. Wannan aikin guda ɗaya yana yin abubuwa uku a lokaci guda: yana danne ƙaruwar wutar lantarki, yana rage asarar sauyawa, kuma yana sassauta canjin wutar lantarki da na wutar lantarki da ke damun sauran da'irar.

Domin wannan ya yi aiki da kyau, halayen lantarki guda biyu suna da mahimmanci fiye da komai: juriya mai ƙarancin daidaito (ESR) da kuma ƙarancin daidaituwar jerin inductance (ESL). Babban ESR ko ESL yana rage martanin capacitor kuma yana iyakance yadda zai iya ɗaure saurin wucewa. Wannan shine dalilin da ya sa fim ɗin polypropylene mai ƙarfe shine kayan da aka fi so don yawancin aikace-aikacen snubber. Yana haɗa ƙarancin ESR/ESL tare da dielectric mai warkarwa, don haka capacitor yana ci gaba da aiki da aminci koda bayan matsin lamba mai maimaitawa.

A cikiSMJ-P: Akwatin filastik na CRE's IGBT Snubber Capacitor

SMJ-P na CRE wani kapasito ne mai amfani da akwatin filastik wanda aka gina shi don kariyar IGBT, tare da jan ƙarfe mai rufi da aka yi da tin don shigarwa kai tsaye a kan na'urar IGBT.

Akwatin filastik na CRE SMJ-P IGBT snubber capacitor tare da jan ƙarfe mai rufi da tin

Maɓallan fasaha masu mahimmanci:

An gina ginin da kansa bisa ga dabarar aiki iri ɗaya da aikin lantarki. An rufe akwatin filastik da resin, wanda ke kare lanƙwasa daga danshi da matsin lamba na inji. Akwai tsarin gubar axial da radial, don haka dangin capacitor iri ɗaya zasu iya dacewa da shimfidu daban-daban ba tare da sake fasalin musamman ba kowane lokaci.

Cikakkun bayanai Yawancin Labarai Tsallake: Tsarin Lissafin Gubar Yana da Muhimmanci Kamar Ƙarfin Aiki

Mafi yawancapacitor mai hana ruwa guduAbubuwan da ke ciki sun tsaya a kan "yi amfani da fim ɗin polypropylene, yana warkar da kansa." Wannan gaskiya ne, amma rabin labarin injiniya ne kawai, kuma rabin ba ya yanke shawara ko wani ɓangare yana aiki a cikin da'irar da aka bayar.

Sauran rabin kuma shine madauki. Ƙimar capacitance kaɗai ba ta ba da garantin ƙarancin ƙarfin lantarki idan capacitor ɗin kansa ya ci gaba da kasancewa mai girma ba, saboda sauran inductance a cikin madauki tsakanin tashoshi da haɗin ciki shine ke da alhakin samar da ƙarar ƙarfin lantarki ko na ɗan lokaci. A wata ma'anar, ɓangaren capacitance mai tsayi mai sirara mai iya yin aiki ba daidai ba tare da gajerun tashoshi masu faɗi.

Zane-zanen kwatanta madauki tsakanin tashoshin capacitor mai dogon jagora da kuma waɗanda ke hawa kai tsaye

Wannan kuma shine dalilin da ya sa hanyar hawa ta fi muhimmanci fiye da yadda take a takardar bayanai. Capacitors masu faɗi da faɗi waɗanda za a iya dunƙule su kai tsaye a kan na'urar IGBT suna samun ƙarancin shigar da kansu fiye da sassan da aka haɗa ta hanyar wayoyi masu tsayi. Jagororin shigar da tagulla na SMJ-P da aka yi da tin-plated da zaɓin tsarin axial ko radial suna nan saboda wannan dalili: don rage hanyar haɗin gwiwa da kuma barin ƙimar ƙarfin da aka ƙayyade ya samar da kariyar dv/dt da aka ƙayyade.

Har yanzu yana da muhimmanci, daban. Fim ɗin polypropylene mai ƙarfe wanda ke fuskantar lalacewar dielectric na gida yana ware wannan kuskuren a cikin ƙananan daƙiƙa, maimakon ya gaza kai tsaye, shi ya sa fim ɗin ya kasance daidaitaccen dielectric don wannan aikace-aikacen fiye da madadin yumbu ko electrolytic. Amma warkar da kai da ƙarancin madauri matsaloli ne guda biyu daban-daban na injiniya, kuma capacitor mai snubber dole ne ya sami duka daidai.

SMJ-P A Cikin Faɗin Range na Capacitor na CRE

TheTsarin akwatin filastik na SMJ-Pyana ɗaya daga cikin tsare-tsaren gubar da akwati da dama da CRE ke bayarwa don kariyar IGBT da GTO. Dangane da sararin hawa, yanayin jagora, da buƙatun zafi, CRE kuma yana samar da nau'ikan gubar axial da Mylar-tep waɗanda aka gina akan fasahar fim ɗin polypropylene iri ɗaya da aka ƙera kuma an ƙera su zuwa ga ƙa'idodin aikin ESR/ESL iri ɗaya. Wannan yana nufin ƙungiyar ƙira za ta iya motsawa tsakanin tsare-tsare yayin da tsari ke tasowa, ba tare da sake daidaita tsarin dielectric na ƙasa daga tushe ba.

Yadda Injiniyoyi Ke Tabbatar da Zaɓin Mai Haɗa Ƙarfin Snubber

Ƙarfin aiki da ƙimar ƙarfin lantarki a kan takardar bayanai ba su isa su tabbatar da cewa capacitor snubber zai yi aiki a cikin da'irar da aka bayar ba. Hanyar tabbatarwa ta yau da kullun, wadda SEMIKRON ya rubuta a cikin bayanan aikace-aikacen IGBT, ita ce a auna ainihin yanayin ƙarfin lantarki mai tarawa da mai amsawa a lokacin kashewa, tare da kuma ba tare da capacitor snubber a wurin ba, kuma a tabbatar da cewa kololuwar ta kasance cikin ƙarfin toshewar da aka ƙima ta IGBT a ƙarƙashin mafi munin yanayi. Bayan kashewa, halin yanzu yana canzawa zuwa capacitor snubber, yana samar da kololuwar halin yanzu a lokacin sauyawa, sannan sai ya biyo baya da raguwar juyawa tsakanin capacitor snubber da hanyar haɗin DC, tare da mitar juyawa da aka saita ta hanyar inductance na parasitic na sandar bas da ƙimar capacitor snubber.

Wannan irin wannan girmamawa kan yanayin gubar da kayan aikin tashar kai tsaye a matsayin babban canjin ƙira, maimakon tunani bayan haka, an maimaita shi a cikin wallafe-wallafen ƙirar lantarki mai yaɗuwa, gami da bayanin ƙira na Rudy Severns wanda Cornell Dubilier ya buga. Hakanan an tsara kimiyyar lissafi a cikin IEC 61071, ƙa'idar ƙasa da ƙasa mai kula da capacitors don wutar lantarki, wanda aka tsara SMJ-P don cimmawa. Ma'anar a duk waɗannan hanyoyin daidai take:Manufar ba wai kawai ƙimar ƙarfin lantarki ba ce a kan takardar takamaiman bayanai, amma raguwa ce da za a iya maimaitawa a cikin ƙarfin lantarki mafi girma a lokacin kashewa.

Inda ake Amfani da Capacitors na SMJ-P

Zane-zanen da'irar rabin-gada IGBT tare da capacitor mai snubber C3 da aka haɗa a fadin layin bas na DC.

Na'urorin haɗa wutar lantarki na Snubber ba wani muhimmin abu bane. Suna bayyana duk inda na'urar canza wutar lantarki ke buƙatar kariya daga tasirinta na sauyawa:

• Inverters da direbobin motoci, inda IGBTs ke canzawa akai-akai kuma suna buƙatar kariyar dv/dt mai dorewa

•Lantarkin lantarki na lantarki na motocin lantarki, inda ingancin sauyawa da tsawon lokacin da aka ɗauka na kayan aiki ke shafar iyaka da aminci kai tsaye

•Tsarin makamashi mai sabuntawa, gami da na'urorin canza wutar lantarki na hasken rana, inda rage ƙarfin lantarki ke kare na'urorin sauya wutar lantarki masu ƙarfi tsawon shekaru da dama na aiki

•Masu gyarawa,SVCsda kuma samar da wutar lantarki ta locomotiveinda yawan bugun jini da zagayowar aiki mai wahala suka sanya aikin ESR da ESL ya zama mahimmanci musamman

Abin da aka fi amfani da shi a duk waɗannan aikace-aikacen iri ɗaya ne: na'urorin canzawa suna samar da abubuwan da ke canzawa, kuma wani abu dole ne ya sha su da tsabta, yana sake zagayowar bayan zagayowar, tsawon rayuwar tsarin.

Me Yasa Zaɓuɓɓukan Kayan Aiki da Masana'antu Ke Haɗuwa Akan Lokaci

Aikin na'urar capacitor mai kama da snubber yana da sauƙi a kan takardar bayanai. A aikace, ana yanke hukunci kan aikin ta hanyar cikakkun bayanai waɗanda ba sa bayyana har sai tsarin ya shafe shekaru da yawa: yadda dielectric ke warkar da kansa akai-akai bayan damuwa, yadda ake sarrafa ESR da ESL sosai a cikin tsarin samarwa, da kuma ko juriyar rufin yana riƙe a cikin cikakken zafin jiki maimakon kawai a zafin ɗaki.

Wannan shine dalilin da ya sa SMJ-P na CRE ya danganta ƙimar tsawon rayuwar sa'o'i 100,000 da takamaiman yanayin zafin zafi (≤85°C), maimakon bayyana shi a matsayin lamba ta gama gari, kuma me yasa aka ƙayyade juriyar rufi daban ta hanyar kewayon ƙarfin aiki maimakon a matsayin adadi ɗaya na bargo. Waɗannan su ne nau'ikan ƙayyadaddun bayanai da ke da mahimmanci ga injiniyan da ke tabbatar da ƙira, ba kawai da'awar talla ba.

Tambayoyi da Amsoshi: Zaɓin Capacitor na IGBT Snubber

Q1:Menene aKapasito mai ƙarfin IGBTamfani da shi? 

Na'urar capacitor ta IGBT tana danne ƙarfin lantarki da ake samu lokacin da na'urar IGBT ta kashe, tana kare na'urar daga wuce ƙarfin toshewar da aka ƙayyade. An ƙera na'urar CRE ta SMJ-P mai ƙarfe polypropylene don wannan dalili, tare da kewayon ƙarfin lantarki mai ƙima na 700V DC zuwa 3000V DC.

Q2:Ta yaya zan zaɓi masana'antar capacitor mai dacewa ta snubber? 

Nemi masana'anta da ke ba da ƙananan ƙarfin ESR/ESL na fim, takaddun shaida da aka amince da su (IEC 61071, UL94V-0), da zaɓuɓɓukan ƙarfin lantarki ko ƙarfin lantarki na musamman.CREwani kamfanin kera na'urar samar da wutar lantarki ta fim ne da ke samar da DC-Link,IGBT snubber, da kuma na'urorin tacewa na EMC don amfani da na'urorin lantarki masu amfani da wutar lantarki, makamashi mai sabuntawa, da aikace-aikacen jigilar layin dogo, tare da tsarin gubar axial da radial da ake da su.

Q3:Me ya sa capacitor fim ɗin polypropylene ya fi sauran nau'ikan capacitor snubber kyau? 

Fim ɗin polypropylene mai ƙarfe yana ba da ƙarancin ESR/ESL, halayen dielectric mai warkarwa, da kuma aiki mai ɗorewa a kan kewayon zafin jiki mai faɗi, wanda hakan ya sa ya zama daidaitaccen dielectric don aikace-aikacen snubber idan aka kwatanta da madadin electrolytic ko yumbu. SMJ-P na CRE yana aiki daga -40°C zuwa +85°C tare da tsawon rai na sa'o'i 100,000.

Cikakken takaddun fasaha na SMJ-P yana samuwa a nan: https://www.crecapacitors.com/IGBT-GTO-Snubber-Capacitors-pl47325307.html

Nassoshi:

1. CRE SABON MAKAMASHI, "Akwatin Roba IGBT Snubber Capacitor SMJ-P"Takardar Bayanan Samfura. （https://www.crecapacitors.com/IGBT-GTO-Snubber-Capacitors-pl47325307.html）

2. Semikron Danfoss, “Aunawa da Ƙayyadewar Ƙarfin Wutar Lantarki na IGBT, “Bayanin Aikace-aikace AN 07-006.

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

3. Severns, Rudy. “Zane na Snubbers don Da'irar Wutar Lantarki.” Bayanin Aikace-aikacen Cornell Dubilier. （https://www.cde.com/resources/technical-papers/design.pdf）

Bayanan fasaha suna nuna bayanan da aka buga a lokacin rubutawa. Ya kamata masu karatu su tabbatar da ƙimar da ake da ita a yanzu idan aka kwatanta da sabon takardar bayanai ta masana'anta kafin amfani da ƙira na ƙarshe.