Yuav ua li cas los txhim kho lub peev xwm nqa tam sim no los ntawm parallel diodes?

Ib, Lub hauv paus ntawm lub cev thiab qhov zoo ntawm cov cuab yeej sib luag
Lub hauv paus ntsiab lus tseem ceeb ntawm kev sib txuas ntawm diode yog ua raws li kev hloov pauv tam sim no. Nyob rau hauv txoj kev xav, thaum N diodes nrog cov tsis zoo tib yam txuas nrog nyob rau hauv parallel, tag nrho cov peev xwm nqa tam sim no tuaj yeem nce mus rau N npaug ntawm ib qho khoom siv. Piv txwv li, nyob rau hauv 50A rectifier Circuit Court, siv peb MUR2020s (rated tam sim no 20A) nyob rau hauv parallel theoretically yuav ua tau ib tug tam sim no ua muaj peev xwm ntawm 60A. Txoj kev nthuav dav no muaj qhov zoo tseem ceeb:

Kev ua kom zoo dua tus nqi: Piv nrog rau kev siv ib qho khoom siv siab tam sim no, cov txheej txheem sib npaug tuaj yeem txo cov nqi los ntawm kev sib txuas cov khoom siv. Piv txwv li, ib qho project photovoltaic inverter txo cov nqi 40% los ntawm kev sib piv plaub SS34 Schottky diodes (rated tam sim no 3A) los hloov ib qho 12A ntaus ntawv.
Kev tsim kho dua tshiab: Parallel cov qauv ib txwm muaj qhov ua txhaum cai. Thaum lub diode ua tsis tiav, cov khoom seem tseem tuaj yeem tswj hwm ib feem ntawm kev ua haujlwm, txhim kho kev ntseeg tau zoo. Tom qab tau txais ib qho kev sib txuas lus sib txuas rau UPS fais fab mov hauv ib qho chaw cov ntaub ntawv, MTBF (lub sijhawm nruab nrab ntawm kev ua tsis tiav) tau nce mus rau 200000 teev.
Simplified heat dissipation: Cov tam sim no yog dispersed ntawm ntau yam khoom siv, txo qhov kub ntawm ib qho chaw kub ceev, uas yog qhov zoo rau kev simplifying tshav kub dissipation tsim. Nyob rau hauv ib qho kev them nyiaj hluav taws xob lub tsheb, cov txheej txheem sib npaug yuav txo tau qhov kub ntawm lub dab dej los ntawm 30% thiab tswj qhov kub ntawm qhov kub ntawm 45 degrees.
2, Cov teeb meem tseem ceeb thiab tsis ua hauj lwm mechanisms ntawm kev sib txuas tsim
Txawm hais tias kev siv thev naus laus zis muaj txiaj ntsig tseem ceeb, ob qhov teeb meem tseem ceeb yuav tsum tau hais txog hauv cov kev siv tswv yim engineering:

Kev faib tawm tsis sib xws: Vim yog kev tsim cov txheej txheem sib txawv, muaj qhov sib txawv ntawm ntau dua 0.1V hauv qhov kev poob qis rau pem hauv ntej (V_F) txawm rau diodes ntawm tib tus qauv. Cov khoom siv nrog VF qis dua yuav nyiam ua thiab dais tam sim no, ua rau muaj cua sov hauv zos. Kev kuaj xyuas cov hlua photovoltaic qhia tau hais tias cov diodes sib npaug nrog VF qhov sib txawv ntawm 0.15V tuaj yeem ua tiav qhov kev faib tawm tam sim no ntawm 3: 1, thiab qhov kub thiab txias ntawm cov khoom siv thauj khoom siab yog 25℃siab dua qhov nruab nrab tus nqi.
Kev pheej hmoo ntawm thermal runaway: tsis sib xws tam sim no tuaj yeem ua rau muaj cua sov hauv zos, ntxiv txo cov cuab yeej VF thiab tsim cov lus qhia zoo. Hauv qee qhov kev lag luam hluav taws xob, cov txheej txheem sib txuas yam tsis muaj kev sib koom tam sim no ua rau tsis ua haujlwm ntawm tag nrho cov module vim overheating thiab hlawv ntawm diode tom qab 2 teev ntawm kev ua haujlwm tag nrho.
3, Optimization cov tswv yim thiab engineering kev coj ua rau kev lag luam validation
Txhawm rau daws cov teeb meem uas tau hais los saum no, kev lag luam tau tsim cov kev daws teeb meem zoo tshaj plaws uas suav nrog peb theem: kev xaiv cov cuab yeej, kev tsim hluav taws xob, thiab kev tswj xyuas thermal

1. Cov khoom siv xaiv thiab sib txuam
Tib yam kev tshuaj ntsuam batch: Qhov tseem ceeb yuav tsum tau muab rau kev xaiv cov khoom siv los ntawm cov khoom siv tib yam thiab wafer txiav kom ntseeg tau tias muaj qhov sib xws hauv qhov tsis xws li VF thiab lub sijhawm rov qab los (t_rr). Ib lub chaw tsim tshuaj paus photovoltaic inverter tau nruj me ntsis soj ntsuam thiab tswj VF dispersion nyob rau hauv ± 0.05V.
Schottky diode qhov tseem ceeb: Piv rau PN junction diodes zoo tib yam, Schottky diodes muaj qis VF (0.3-0.6V) thiab zoo dua parameter sib xws. Hauv qhov tsis tshua muaj hluav taws xob thiab cov xwm txheej tam sim no siab (xws li 12V / 20A them modules), Schottky parallel scheme txhim kho cov txiaj ntsig tam sim no los ntawm ntau dua 50% piv rau cov diodes zoo tib yam.
Ntau cov ntim ntim khoom siv: siv ntau lub ntim ntim uas twb tau ua tiav qhov sib npaug sib npaug sab hauv (xws li ob lub Schottky ntim), tuaj yeem ua kom yooj yim rau kev tsim hluav taws xob sab nraud. Tom qab siv cov khoom siv no hauv qee qhov kev sib txuas lus fais fab, thaj chaw PCB raug txo los ntawm 40% thiab kev sib dhos ua haujlwm tau zoo dua los ntawm 30%.
2. Circuit Court tsim optimization
Tam sim no sib koom resistor tsim: Txuas me me resistors (feem ntau 0.1-0.5 Ω) nyob rau hauv series nrog txhua diode kom ua tau raws li tam sim no tshuav los ntawm resistor voltage poob. Qhov loj dua tam sim no, qhov tsawg dua qhov kev tiv thaiv tus nqi yuav tsum yog. Piv txwv li, nyob rau hauv ib tug 100A parallel Circuit Court, xaiv ib tug 0.1 Ω tam sim no sib koom resistor tuaj yeem tswj qhov kev faib tawm tam sim no tsis pub dhau ± 5%.
Kev siv tshuab tam sim no sib koom: Rau siab - qhov xav tau qhov tseeb, lub tswv yim sib faib tam sim no siv cov MOSFETs sib npaug tuaj yeem siv tau. Los ntawm kev txheeb xyuas qhov tam sim no ntawm txhua ceg thiab kho cov MOSFET ntawm kev tawm tsam hauv lub sijhawm tiag tiag -, kev sib qhia meej tam sim no tuaj yeem ua tiav. Tom qab siv cov tswv yim no, qhov kev sib koom tam sim no qhov tseeb ntawm qee lub tshuab hluav taws xob hluav taws xob tau txhim kho mus rau ± 2%, thiab qhov ua tau zoo tau raug txo kom tsawg dua 0.5%.
Layout thiab thaiv kev ua kom zoo dua: Ua kom muaj qhov sib luag ntawm cov khoom siv sib luag, ua kom luv txoj hauv kev tam sim no, thiab txo cov kab mob parasitic inductance sib txawv. Cov qauv tsim tshwj xeeb rau qee qhov chaw nres tsheb hluav taws xob them hluav taws xob xav kom qhov sib txawv ntawm qhov sib npaug diode pins yuav tsum tsis pub tshaj 0.5mm kom txo tau qhov hluav taws xob ringing nyob rau hauv siab - zaus hloov.
3. Txhim kho thermal tswj
Kev ua kom zoo ntawm cov qauv cua sov: Cov khoom siv xws li cov phaj kub sib txawv thiab cov thermal conductive silicone roj yog siv los txhim kho thermal conductivity efficiency. Ib qho photovoltaic inverter txhim kho qhov sib xws ntawm qhov kub thiab txias nce los ntawm 20℃los ntawm kev tso lub tshav kub faib phaj nyob rau hauv parallel diodes.
Thermal simulation thiab pov thawj: Ua thermal simulation siv cov cuab yeej xws li ANSYS Icepak kom optimize qhov loj ntawm lub dab dej kub thiab kiv cua ceev. Ib qho kev lag luam fais fab kev lag luam txo cov nqi hluav taws xob los ntawm 15% los ntawm kev sim, thaum ua tau raws li IEC 60068-2-1 thermal shock testing standard.
Kev ntsuas kub ntawm lub sijhawm tiag tiag: Nruab NTC thermistor rau saum npoo ntawm cov khoom tseem ceeb, ua ke nrog MCU kom ua tiav kev tiv thaiv cua sov. Ib lub chaw muab ntaub ntawv UPS fais fab mov tau luv lub sij hawm teb qhov yuam kev kom tsawg dua 10ms los ntawm qhov kev daws teeb meem no.
4, Cov xwm txheej ntawm daim ntawv thov thiab kev txheeb xyuas qhov txiaj ntsig
1. Secondary rectification ntawm photovoltaic inverter
Nyob rau hauv ib txoj hlua inverter, qhov thib ob rectification yuav tsum tau lis 10-30A tam sim no. Tom qab siv qhov sib npaug Schottky diode tswv yim:

Kev txhim kho kev ua tau zoo: Cov kev ua tau zoo tau raug txo los ntawm 11W (zoo tib yam ceev rov qab raj) mus rau 5W (Schottky raj), uas ua rau 6 feem pua ​​​​ntawm qhov ua tau zoo.
Kev txhim kho kev ntseeg tau: MTBF tau nce los ntawm 150000 teev mus rau 250000 teev, thiab qhov tsis ua haujlwm txhua xyoo tau txo los ntawm 60%.
Tus nqi optimization: BOM tus nqi txo rau ib qho inverter
8. Muab xam raws li kev tsim khoom txhua xyoo ntawm 100000 units, kev txuag nyiaj txhua xyoo yog ua tiav
800000.
2. Fais tsheb them module
Hauv 7kW AC charging chaw nres tsheb, ob qho tib si PFC boost theem thiab cov zis rectifier theem yuav tsum tau sib npaug diodes:

Kev txhim kho lub zog ceev: Los ntawm kev sib piv silicon carbide Schottky diodes, lub zog ceev tau nce los ntawm 0.5kW / L txog 0.8kW / L, thiab qhov ntim tau txo los ntawm 37.5%.
EMC kev ua tau zoo dua: Rov qab lub sij hawm rov qab los ntawm 50ns (ultrafast rov qab raj) rau 0ns (Schottky raj), EMI suab nrov txo los ntawm 10dB.
Kev txo nqi tag nrho lub neej: Txawm hais tias tus nqi ntawm ib lub cuab yeej nce los ntawm 20%, kev txhim kho hauv kev ua haujlwm ntawm lub cev thiab cov nqi hluav taws xob txo qis ua rau 15% txo hauv 5 xyoo tag nrho cov nqi ntawm cov tswv cuab (TCO).
3. High zaus rectification ntawm industrial fais fab mov
Nyob rau hauv 48V / 100A kev sib txuas lus fais fab mov, ib tug parallel ultrafast rov qab diode tswv yim yog saws:

Txo kev hloov pauv poob: Lub t-rr txo qis los ntawm 300ns mus rau 50ns, txo qis kev hloov pauv los ntawm 80% thiab nce kev ua haujlwm ntawm 92% mus rau 95%.
Tso zis ripple suppression: Qhov rov qab rov qab tam sim no ncov yog txo los ntawm 5A mus rau 1A, thiab cov zis ripple voltage yog txo los ntawm 200mV mus rau 50mV.
Txhim kho daim ntawv pov thawj dhau tus nqi: Ua tau raws li qhov kev xeem ntsuas ntawm IEC 61000-4-5, thiab thawj tus nqi ntawm cov khoom tau nce los ntawm 70% mus rau 95%.