Yuav ua li cas los hloov ua qhov kev ua txhaum kev diodes hauv cov khoom siv hluav taws xob rau ntawm qhov chaw yog dab tsi?

, Txhaum kev kuaj mob thiab ib cheeb tsam
1. Qhov kev qhia txog kev paub txog thiab kev txiav txim siab ua ntej
Pom cov tsos tshuaj xyuas: saib seb puas muaj Diodoo tawg, cov pins yog oxidized lossis hlawv (xws li cov pins dub hauv-220 pob). Nyob rau hauv cov cua fais fab converter rooj plaub, cov oxidation ntawm diode pins tshwm sim ua kom muaj kev nce ntxiv, ua rau muaj kev kub ntxhov hauv zos.
Cov ntxhiab thiab lub suab: Lub faulty diode tsis hnov ​​tsw lossis muaj nrog cov suab me me (xws li "crackling" cov suab "uas tau tshwm sim thaum rov qab tawg tshwm sim).
Qhov ntsuas kub tsis zoo: Siv cov cua sov infrared rau kev pom, kub ntawm lub faulty diode no tej zaum yuav yog 20-50 qib siab dua li ntawm cov khoom siv li qub. Nyob rau hauv qee lub photovoltaic inverter rooj plaub, kub junction kub txog 140℃(ib txwm muaj nuj nqis tsawg dua los yog sib npaug ntawm 110 degree), ua rau muaj kev tiv thaiv ntau dua.
2. Hluav taws xob hluav taws xob parameter
Kev sim offline: Siv cov teser lcr kev ntsuas cov teeb meem zoo li qub, nrog kev ua kom pom tseeb:
Forwar rau pem hauv ntej Voltage poob (vf ntawm schottky diodes yuav tsum tsawg dua los yog sib npaug rau 0.5v (xws li 1n5819). Yog tias ntsuas tus nqi ntsuas ntau dua 0.7v, nws qhia tau cov khoom siv laus.
Thim rov qab tam sim no (ir): thaum vr =800 v, i ir ntawm 1 μ. Yog tias nws ntau tshaj 50 μ A, nws yuav tsum tau hloov.
Rov qab lub sijhawm rov qab (TRR): Lub TRR ntawm cov kev rov qab nrawm dua yuav tsum tsawg dua lossis sib npaug nrog mur 860). Yog tias nws tshaj 100ns, nws yuav cuam tshuam rau kev hloov mus hloov kev ua tau zoo.
Kev Ntsuas online: Kev ntes cov voltage Waveform ntawm ob xaus ntawm Diode los ntawm ib qho oscilloscope. Thaum rov qab tawg tshwm sim, ib qho tsis zoo (xws li -10V) yuav tshwm sim, thaum cov nthwv dej ib txwm yuav tsum yog ib qho rectified waveForm.
3. Lub hauv paus ua rau pom ntawm kev ua yuam kev
Overvoltage breakdown: Check if the driving circuit generates a spike voltage (such as dv/dt>5KV / μ S thaum igbt tau muab tua).
Overcurrent burout: Tshawb xyuas seb qhov kev tiv thaiv kev tiv thaiv tam sim no yog tsim nyog (xws li ua rau muaj kev tiv thaiv tsis pub dhau 102 zaug ntawm qhov ntsuas (nyob rau ntawm 1.2.
Thermal Khiav: Tshawb xyuas yog tias lub zog txias tawg yog thaiv (xws li plua plav ntxiv hauv cov huab cua ua rau 30% nce ntxiv hauv thermal kuj).
2, ntaus ntawv xaiv thiab ntawv pov thawj
1. Khab parameter txuam
Voltage theem: Qhov voltage withstand tus nqi yuav tsum muaj ntau dua los yog sib npaug ntawm cov cuab yeej qub (yog tias muaj 600v tus qauv tuaj yeem xaiv tau).
Muaj peev xwm tam sim no: Qhov ntsuas tam sim no yuav tsum muaj ntau dua los yog sib npaug ntawm cov kab ke tam sim no ntawm lub system (piv txwv li, yog tias qhov kev ua haujlwm siab tshaj plaws yog 30A, ib qho kev xaiv ntawm 45a, yog 45a diode).
Switching frequency: High frequency applications (such as>50kHz) Yuav tsum siv txoj kev siv ceev nrawm dodes nrog TRR<35ns (such as ESD5B series).
2. Ntim thiab Installation Compatibility
Lub cev nqaij daim tawv nqaij: tus pin sib nraus thiab tuab ntawm cov khoom siv hloov yuav tsum tau ua raws li cov cuab yeej qub (xws li-247 pob pin uas tau nrug ntawm 2.54mm).
Txoj kev teeb tsa: ntsia hlau ntsia hlau ruaj ruaj yuav tsum muaj pov thawj ntawm 0.6-0.8 dog hom ntawv ntsuas kub (tsawg dua lossis sib npaug nrog 260 degree).
Cov cuab yeej ua cua sov dissmation: Yog tias tus thawj ntaus siv cov dej kub, nws yog ib qho tsim nyog yuav kom ntseeg tau tias cov khoom siv thermal (xws li sib npaug ntawm 5℃/ w)℃/ w).
3. Kev txheeb xyuas cov kev daws teeb meem
Txo cov kev siv: nyob rau hauv lub teeb thauj cov xwm txheej, ntau dua voltage resistant resistant cov cuab yeej tuaj yeem siv tau hloov ua ntej (xws li siv 1200v diodes hloov ntawm 600V qauv).
Kev nthuav dav sib xws: Yog tias tam sim no ntawm ib lub raj tsis txaus, cov cuab yeej ntawm tib tus qauv tuaj yeem txuas nrog rau hauv kev faib tawm tsawg dua lossis sib npaug rau 5%).
Txawj tej yam ntxiv thiab hloov pauv: Hloov silicon donges nrog sic diodes tuaj yeem txo cov vf los ntawm 30% (xws li 0.8v) thiab txhim kho kev ua tau zoo los ntawm 2%.
3, rau ntawm cov chaw ua haujlwm hloov cov haujlwm tshwj xeeb
1. Kev npaj kev nyab xeeb
Lub Hwj Chim Office: Disconnect DC Sab Fuse thiab siv ntau ntau los soj ntsuam tias tsis muaj voltage (residual voltage<36V).
Cov Kev Tiv Thaiv Tus Kheej: Hnav cov hnab looj tes insulated (withst voltage ntau dua los yog sib npaug rau 1000v) thiab anti - zoo li cas wristic hau (tsis kam<1M Ω).
Tuam Kev npaj: siv cov hluav taws xob tshuab hluav taws xob nrog cov hluav taws xob hlau nrog ESD kev tiv thaiv (kub kho tau rau 350 degree), Tin Abseque, thiab torque tus ntsia hlau.
2. Disassembly cov txheej txheem
Welded Cheebtsam:
Cua sov lub cam sib koom ua ke rau 240-260℃thiab tshem tawm cov cam nrog lub tin absorber.
Maj mam nqus cov cuab yeej los laij nws los ntawm PCB, zam kev rub tawm uas yuav ua rau pom cov ntaub qhwv tawm.
Ntxuav cov satder ncoo cov seem (siv tshuaj tua kab mob ethanol thiab cov paj rwb).
Ntsia thawv Nruab:
Siv lub torque tus ntsia hlau los xoob cov ntsia hlau hauv kab pheeb ces kaum kev txiav txim (tig 45℃txhua lub sijhawm).
Sau cov ntsia hlau saib kom tsis txhob muaj kev ntxhov siab (xws li kos cim "1" thiab "2").
Them sai sai rau cov kab khoov ntawm cov pins thaum tshem tawm cov cuab yeej.
3. Txhim kho ntawm cov khoom siv tshiab
Welded teeb tsa:
Thov cov kev ua si -} tsis muaj tso quav (sn96.5ag3cu0.5) ntawm cov cam.
Dlhos cov pins thiab ham ntaub qhwv, cua sov kom 250℃kom yaj cov cam.
Kuaj xyuas yog tias cov pob qij yeeb yog tag nrho (tsis muaj virtual soldering lossis bridging).
Ntsia thawv ruaj ruaj:
Thov cov roj cua sov thermal (tuab 0.1-0.2mm) ntawm lub cuab yeej thiab cov cua sov.
Zawm cov screws hauv kab pheeb ces kaum kev txiav txim, nrog rau lub zog kawg ntawm 0.6-0.8 Lenpen ·.
Txheeb xyuas qhov kev ncua deb ntawm cov pins thiab PCB ntau dua 0.5mm los tiv thaiv luv luv circuits.
4, Kuaj xyuas kev txheeb xyuas tom qab hloov
1. Kev sim siab zoo li qub
Positive conduction test: Apply 0.5V DC voltage, and the measured current should be ≥ rated value (such as 1A diode current>1.2A).
Rov Qab Thaiv Thaiv Kuaj: Siv 80% ntawm cov ntsuas thim rov qab (xws li thov 480V rau 600V Diode), thiab cov xau dej tam sim no yuav tsum tsawg dua 1 μ A.
2. Kev kuaj mob tsis zoo
Lub Teeb Load Twv: Cov lus tawm tswv yim 10% ntsuas ntsuas tam sim no thiab xyuas kom paub qhov tso tawm WaveFormform yog qhov ua rau nruj dawb (th<3%).
Tag nrho cov kev thauj khoom: Cov rated rated tam sim no, khiav tsis tu ncua rau 2 teev, ntsuas kub saib xyuas kub (tsawg dua lossis sib npaug nrog 110 degree).
Kev kuaj mob pauv: simulate hloov ua tej yam (xws li igbt tig thiab tawm 1000 zaug ib ob) kom paub tseeb tias cov diode tsis muaj kev sib tw.
3. System ua ke debugging
Tswj Parameter Calibration: Kho lub tsheb tsis kam (xws li txij li 10 ω txog 8 ω) kom ua kom hloov kho lub nrawm nrawm.
Kev Tiv Thaiv Qhov Kev Tiv Thaiv Kev Nyab Xeeb: Ua rau muaj kev tiv thaiv ntau dhau (xws li 1.2 zaug ntsuas tam sim no) thiab sau lub sijhawm ua (yuav tsum yog<10 μ s).
EMC sim: Raws li IEC 61000-4-5 tus qauv, muaj peev xwm ntawm nrog nrog 8kv / 5ka Surge cuam tshuam.
5, kev soj ntsuam raug
Rooj plaub 1: Hloov ntawm DC sab diodes nyob rau hauv photovoltaic inverters
Txhaum Eromenon: Cov inverter tshaj tawm ib "DC txuas overvoltage" txhaum, nws tau pom tias DC sab Anti rov qab muaj tawg.
Hloov cov txheej txheem:

Xaiv tib tus qauv ntawm 1000V / 20A Fast Rov Qab Txuas Diode (Mur2010ct).
Thaum lub sij hawm vuam, tswj qhov ntsuas kub ntawm cov cam los rau 250℃thiab lub sijhawm vuam kom tsawg dua 3 vib nas this.
Tom qab hloov thiab kev xeem tag nrho, cov efficiency tau nce los ntawm 97.2% rau 97.5%.
Rooj plaub 2: Hloov ntawm embedded donges donges hauv igbt modules ntawm cov fais fab hluav taws xob hloov
Txhaum Eromenon: Cov inverter tshaj tawm ib qho "awsbt overheat" txhaum, thiab nrhiav tau hais tias lub tswv yim vf tau nce mus rau 1.4v (tus nqi qis dua lossis sib npaug nrog 1.1v).
Hloov cov txheej txheem:

Xaiv SIC DIODE (C3D10060H) Hloov cov Silicon Diode, nrog rau withstand voltage ntawm 600v thiab vf=1.2 v.
Kho cov tsav tsheb tsis kam los ntawm 15 ω mus rau 12 ω thiab ua kom pom kev hloov nrawm.
Tom qab hloov, lub system ua hauj lwm ua haujlwm nce los ntawm 1.8% thiab kev sib tw kub txo qis los ntawm 15 degree.