Chii Chinoitika muMicrosecond kana IGBT Yadzima

Nguva imwe neimweIGBTKana zvangopera, chimwe chinhu chine chisimba chinoitika munguva pfupi.

Kuenzanisa kwevoltage waveform kunoratidza IGBT turn-off spike ine uye isina CRE snubber capacitor

Mhepo inoyerera nemumudziyo inokanganiswa. Simba rinochengetwa mumhepo inodonha mudunhu harina kwarinoenda. Rinobuda semhepo inokwira. Kana pasina chinotora mhepo iyoyo, rinogona kudarika voltage yakayerwa yeIGBT uye rinokuvadza mudziyo wacho.

Iri ndiro dambudziko chairo rinogadziriswa ne snubber capacitor. Uye zvakakodzera kunzwisisa zvakanaka, nekuti musiyano uripo pakati pe snubber capacitor yakanaka nepakati unoratidzwa kana mudziyo ukakundikana mwedzi kana makore zvichitevera, kwete pazuva rekutanga.

Basa reSnubber Capacitor

A capacitor yesimbi isina chinhuinogara pamusoro pechishandiso chekuchinja uye inopa simba iroro rakaburitswa kune imwe nzvimbo yakachengeteka yekuenda.

Kana IGBT yadzima, capacitor inonwisa simba remagetsi rinoshanduka uye inoderedza kukurumidza kwesimba remagetsi (dv/dt) mumudziyo. Basa iroro rimwe chete rinoita zvinhu zvitatu panguva imwe chete: rinodzikisa kukwira kwesimba remagetsi, rinoderedza kurasikirwa kwesimba remagetsi, uye rinogadzirisa kuchinja kwesimba remagetsi nemagetsi kunoshungurudza chikamu chose chemagetsi.

Kuti izvi zvishande zvakanaka, zvinhu zviviri zvemagetsi zvinonyanya kukosha kupfuura chero chimwe chinhu: low equivalent series resistance (ESR) uye low equivalent series inductance (ESL). High ESR kana ESL inononotsa mhinduro ye capacitor uye inoganhurira kuti inogona sei kuvharira fast transient. Ichi ndicho chikonzero nei simbi polypropylene film iri chinhu chinosarudzwa kune akawanda maapplications asina kunaka. Inobatanidza low ESR/ESL ne self-healing dielectric, saka capacitor inoramba ichishanda zvakanaka kunyangwe mushure mekumanikidzwa kwevoltage kakawanda.

Mukati meSMJ-P: CRE's Plastiki Box IGBT Snubber Capacitor

SMJ-P yeCRE ipurasitiki yakagadzirwa nebhokisi repurasitiki, yakagadzirirwa kuchengetedza IGBT, ine tin-plated copper insert leads kuti iiswe zviri nyore zvakananga paIGBT module.

CRE SMJ-P plastic box IGBT snubber capacitor ine tin-plated copper leads

Zviyero zvikuru zvehunyanzvi:

Chivakwa chacho chakavakirwa papfungwa imwecheteyo nekushanda kwemagetsi. Chikwama chepurasitiki chakavharwa neresin, iyo inodzivirira kutenderedza kubva kuhunyoro uye kushushikana kwemakanika. Magadzirirwo ese ari maviri e axial ne radial lead anowanikwa, saka mhuri imwechete ye capacitor inogona kukodzera marongero akasiyana e module pasina kugadzirwa patsva nguva dzese.

Nyaya Dzakawanda Dzoka: Lead Geometry Inokosha Sekunge Kugona Kwayo

Zvizhinjicapacitor yesimbi isina chinhuZviri mukati zvinogumira pa "shandisa polypropylene film, inozvirapa yega." Izvozvo ndezvechokwadi, asi hafu chete yenyaya yeinjiniya, uye hafu yacho ndiyo isingasarudze kana chikamu chakapihwa chichishanda mudunhu rakapihwa.

Imwe hafu ndeye loop inductance. Kukosha kwe capacitance chete hakuvimbisi kuti voltage spike yakaderera kana capacitor yega ichiramba yakakwira, nekuti inductance yasara iri mu loop iri pakati pe terminals ne internal connections ndiyo pachayo inokonzera kukwira kwe voltage kana transient. Nemamwe mashoko, chikamu chine capacitance yakakura chine leads refu, dzakatetepa chinogona kuita zvisina kunaka chikamu chidiki chine terminals pfupi, dzakafara.

Dhiagiramu yekuenzanisa kupinza kwechiuno pakati pematerminal e capacitor ane lead refu neakananga

Ichi ndicho chikonzero nei nzira yekumisikidza ichikosha kupfuura zvainoita papepa redata. Macapacitor ane materminal akafara, akatsetseka anogona kukochekerwa zvakananga pamodule yeIGBT anowana kudzikira kwega kwega kupfuura zvikamu zvakabatana kuburikidza newaya refu dzelead. Ma SMJ-P's tin-plated copper insert leads uye sarudzo ye axial kana radial configuration iripo nekuda kwechikonzero ichi: kuchengetedza nzira yekubatanidza iri pfupi uye kurega capacitance yakayerwa ichipa dziviriro ye dv/dt yayakarongerwa.

Hunhu hwekuzviporesa huchiri kukosha, zvakasiyana. Firimu repolypropylene rakaiswa simbi rinoona kuputsika kwe dielectric munzvimbo inobvisa kukanganisa ikoko muma microseconds, pachinzvimbo chekukundikana zvachose, ndosaka firimu richiramba riri iro dielectric yakajairika yekushandisa iyi pane dzimwe nzira dze ceramic kana electrolytic. Asi kuzviporesa uye low loop inductance matambudziko maviri akasiyana einjiniya, uye snubber capacitor inofanira kuita zvese nemazvo.

SMJ-P Mukati meCRE's Broader Snubber Capacitor Range

IyoFomati yebhokisi repurasitiki reSMJ-Pndeimwe yemhando dzakasiyana dzemagadzirirwo emagetsi nemidziyo yemagetsi dzinopihwa neCRE dzekudzivirira snubber dzeIGBT neGTO. Zvichienderana nenzvimbo yekumisikidza, kurongeka kwemagetsi, uye zvinodiwa pakupisa, CRE inogadzirawo mhando dzemagetsi dzinoshandisa axial-lead neMylar-tape dzakavakirwa patekinoroji yakafanana yepolypropylene film uye dzakagadzirirwa zvinoenderana neESR/ESL performance standards. Izvi zvinoreva kuti timu yekugadzira inogona kufamba pakati pemafomati sezvo marongerwo achichinja, pasina kugadzirisa system ye dielectric kubva pakutanga.

Maitiro Ekuti Mainjiniya Anosimbisa Sarudzo yeSnubber Capacitor

Kukwanisa uye kuyera voltage padatasheet hazvina kukwana kusimbisa kuti snubber capacitor inoshanda mudunhu rakatarwa. Nzira yakajairika yekusimbisa, yakanyorwa neSEMIKRON muIGBT application notes, ndeyekuyera waveform chaiyo ye collector-emitter voltage pa turn-off, ine uye isina snubber capacitor, uye kusimbisa kuti peak inogara mukati meIGBT's rated blocking voltage mumamiriro ezvinhu akaipisisa. Mushure mekudzima, current inopinda mu snubber capacitor, ichigadzira current peak pa switching instant, ichiteverwa ne damped oscillation pakati pe snubber capacitor neDC-link, ne oscillation frequency yakatarwa ne bus bar's parasitic inductance uye snubber capacitor's value.

Kusimbisa uku pa lead geometry uye direct-mount terminal hardware se primary design variable, kwete kufunga nezvekupedzisira, kunodzokororwa mumabhuku ekugadzira ma power electronics akapararira zvakanyanya, kusanganisira Rudy Severns's snubber design reference yakaburitswa naCornell Dubilier. Fizikisi iri pasi payo yakasimbiswawo muIEC 61071, iyo international standard governing capacitors ye power electronics, iyo SMJ-P yakagadzirirwa kusangana nayo. Pfungwa iri muzvinyorwa izvi zvese inoenderana:Chinangwa hachisi chekungoona capacitance value pa spec sheet chete, asi kudzikiswa kwe peak voltage kunodzokororwa kana yadzimwa.

Kunoshandiswa kweSMJ-P Capacitors

Dhayagiramu yecircuit yeIGBT ine hafu yebhiriji ine capacitor C3 yakabatana neDC bus rails.

Ma capacitor eSnubber haasi chinhu chakakosha. Anowanikwa chero kupi zvako kunoda dziviriro kubva pakuchinja kwacho:

• MaInverters nemamota anotyaira, apo maIGBT anochinja nguva dzose uye anoda dziviriro yeDV/DT nguva dzose

•Zvigadzirwa zvemagetsi zvemagetsi zvemotokari yemagetsi, uko kushanda zvakanaka kwekuchinjana uye kugara kwenguva refu kwezvikamu zvinokanganisa zvakananga huwandu uye kuvimbika

•Masisitimu esimba rinogona kudzokororwa, kusanganisira ma solar inverters, uko kudzvinyirirwa kwevoltage spike kunodzivirira michina yekushandura ine simba guru kwemakumi emakore ekushanda

•Zvinogadzirisa,MaSVC, uye magetsi emota, uko mafungu emhepo akakwira uye kutenderera kwemabasa kunoda simba kunoita kuti kushanda kweESR neESL kuve kwakakosha zvikuru

Chinonyanya kutaurwa pane ese maapplication aya chakafanana: switching devices dzinogadzira transients, uye chimwe chinhu chinofanira kuatora zvakanaka, cycle mushure me cycle, kwehupenyu hwese hwesystem.

Nei Sarudzo dzeZvinhu uye Kugadzira Zvichienderana Nenguva

Basa remushandisi we "snubber capacitor" rinoita seriri nyore papepa redata. Mukuita, mashandiro anosarudzwa neruzivo rwusingaonekwe kusvika sisitimu yave nemakore ichishanda: kuti dielectric inoporesa sei mushure mekushushikana, kuti ESR neESL zvinodzorwa zvakasimba sei muchikamu chekugadzira, uye kana kudzivirira kwekudzivirira kuchiramba kuripo muchikamu chetembiricha yese kwete patembiricha yemumba chete.

Ndosaka CRE's SMJ-P ichibatanidza chiyero chayo chehupenyu hwemaawa 100,000 nemamiriro chaiwo ekupisa kwemhepo (≤85°C), pane kuitaura senhamba yakajairika, uye nei kudzivirira kudziya kwemhepo kuchitsanangurwa zvakasiyana ne capacitance range kwete semufananidzo mumwe chete. Aya ndiwo marudzi ezviratidzo akakosha kuinjiniya anosimbisa dhizaini, kwete kungotaura nezvekushambadzira chete.

Mibvunzo Inowanzo bvunzwa: Sarudzo yeIGBT Snubber Capacitor

Q1：Chii chinonziIGBT snubber capacitorinoshandiswa here? 

Capacitor yeIGBT inodzima ma voltage spikes anokonzerwa neIGBT kana yadzima, zvichidzivirira mudziyo kuti usapfuure rated blocking voltage yawo. CRE's SMJ-P metallized polypropylene film capacitor yakagadzirwa nechinangwa ichi, ine rated voltage range kubva pa700V DC kusvika 3000V DC.

Q2：Ndingasarudza sei mugadziri we snubber capacitor akakodzera? 

Tsvaga mugadziri ane macapacitor efirimu ane ESR/ESL yakaderera, zvitupa zvinozivikanwa (IEC 61071, UL94V-0), uye sarudzo dze capacitance kana voltage dzakagadzirwa.CREikambani inogadzira macapacitor efirimu inopa DC-Link,Kuzvidza kweIGBT, uye maEMC-filter capacitors emagetsi emagetsi, simba rinogona kudzokororwa, uye mashandisirwo ekufambisa njanji, ane magadzirirwo e axial ne radial lead aripo.

Q3：Chii chinoita kuti polypropylene film capacitor ive nani pane dzimwe mhando dze snubber capacitor? 

Firimu repolypropylene rine metallized rinopa ESR/ESL yakaderera, hunhu hwe dielectric hunozviporesa, uye kushanda kwakasimba pakupisa kwakasiyana-siyana, zvichiita kuti ive dielectric yakajairika yekushandisa snubber zvichienzaniswa ne electrolytic kana ceramic alternatives. CRE's SMJ-P inoshanda kubva -40°C kusvika +85°C ine hurefu hwemaawa 100,000 ehupenyu.

Magwaro akazara ehunyanzvi eSMJ-P anowanikwa pano: https://www.crecapacitors.com/IGBT-GTO-Snubber-Capacitors-pl47325307.html

Mareferensi:

1. KUBATSIRA SIMBA ITSVA, “Bhokisi repurasitiki reIGBT Snubber Capacitor SMJ-P,” Ruzivo rweChigadzirwa. （https://www.crecapacitors.com/IGBT-GTO-Snubber-Capacitors-pl47325307.html）

2. Semikron Danfoss, “Kuyerwa kweIGBT Peak Voltage uye Snubber Capacitor Specification, “Chinyorwa Chekushandisa AN 07-006.

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

3. Severns, Rudy. "Kugadzirwa kweSnubbers dzePower Circuits." Cornell Dubilier Application Note. （https://www.cde.com/resources/technical-papers/design.pdf）

Magadzirirwo ehunyanzvi anoratidza data rakaburitswa panguva yekunyora. Vaverengi vanofanira kusimbisa ratings dziripo iye zvino vachienzanisa nedata remugadziri wedhizaini risati rashandiswa pakugadzira kwekupedzisira.