Ib, Tsav Circuit Court teeb meem: voltage txuam thiab teeb liab stability
1. Kev tsav tsheb tsis zoo yuav ua rau tsis tiav lossis tsis pom kev
Kev tsav tsheb hluav taws xob ntawm qhov kev sib txuas ntawm lub vijtsam yuav tsum nruj me ntsis phim nws cov kev khiav hauj lwm voltage ntau. Yog hais tias tus tsav tsheb voltage qis dua qhov kev khiav hauj lwm voltage, cov kua siv lead ua kua molecules tsis tuaj yeem deflect txaus, ua rau pom qhov muag plooj lossis ploj lawm; Yog hais tias tus tsav tsheb voltage siab dhau lawm, nws yuav ua rau "ghosting" (tus cwj mem ntu uas yuav tsum tsis txhob taws) los yog to. Piv txwv li, ib lub npe ntawm cov ntsuas hluav taws xob pom thaum lub sij hawm kuaj tias thaum lub zog tsav tsheb poob ntawm 3.3V mus rau 3.0V, qee qhov kev qhia digital tau sib dua; Thaum qhov hluav taws xob nce mus rau 3.6V, muaj ob lub duab ntxoov ntxoo rau saum thiab hauv qab ntawm tus lej "8".
Kev daws:
Voltage calibration: Siv lub oscilloscope los xyuas lub waveform ntawm lub teeb liab tsav tsheb thiab xyuas kom meej tias qhov voltage nyob rau hauv lub nominal ntau yam (xws li 3.0V ± 0.2V rau TN cov ntxaij vab tshaus).
Voltage divider resistor hloov kho: Ntxiv qhov hloov pauv voltage divider resistors hauv lub voj voog tsav, xws li hloov tus thawj 10k Ω resistor nrog 5k Ω potentiometer, thiab them rau qhov sib txawv ntawm qhov hluav taws xob los ntawm kev nplua -tuning.
Kev hloov pauv nti: Yog tias lub zog hluav taws xob nti tsis ruaj khov (xws li qhov hloov pauv hluav taws xob ntau dua ± 5%), nws yuav tsum tau hloov nrog lub zog qis LDO nti (xws li AMS1117-3.3).
2. Teeb liab cuam tshuam thiab cov teeb meem virtual soldering
Yog hais tias muaj virtual soldering los yog luv luv Circuit Court nyob rau hauv lub COM / SEG tus pin ntawm lub tawg code screen, nws yuav ua rau ib co cwj mem tsis. Piv txwv li, tom qab kuaj kev vibration ntawm ib qho khoom siv HMI, cov hlab ntsha hauv qab sab xis ntawm tus lej "5" ploj mus, thiab nws tau pom tias nws yog lub tshuab hluav taws xob ntawm SEG3 tus pin.
Kev daws:
Pin reinforcement: Tin cov pob qij txha thiab ntxiv tshav kub shrink tubing tiv thaiv.
Kev rho tawm cov teeb liab: Ntxiv cov nplhaib sib nqus ntawm lub voj voog tsav thiab lub rooj tsav xwm tseem ceeb txhawm rau txhawm rau siab - cuam tshuam ntau zaus.
Flywire kho: Txuas cov pins tawg nrog 0.2mm enameled xov hlau thiab kho lawv nrog UV kua nplaum.
2, Cov qauv tsim tsis xws luag: mechanical stress and connection stability
1. Kev sib cuag tsis zoo tshwm sim los ntawm deformation ntawm zebra kab txaij
Zebra kab txaij yog cov khoom sib txuas ntawm cov kab ke tawg thiab PCB pawg thawj coj saib. Yog hais tias tsis kho los yog compressed los ntawm sab nraud quab yuam, lawv yog feem ntau deformation thiab ua rau tus pin breakage. Piv txwv li, ib tug handheld ntaus ntawv tau ntsib ib tug "tsis nco qab cwj mem" txhaum tom qab lub zebra bar hloov vim lub screen presses ntau zaus los ntawm cov neeg siv.
Kev daws:
Kev txhim kho cov txheej txheem: Ntxiv cov kab ntawv tso rau ntawm ob sab ntawm cov kab txaij zebra, lossis siv hlau PIN taw (tus nqi nce li ntawm 15%).
Cov khoom siv kho dua tshiab: Kev siv siab elasticity silicone zebra kab txaij (Shore hardness 30 ± 5) los hloov cov khoom siv PVC tsoos.
Kev tiv thaiv txheej ntxiv: Muab 0.5mm tuab PC board rau ntawm qhov screen kom cais cov ntiv tes los ntawm kev nias ncaj qha.
2. Mismatch ntawm saib lub kaum sab xis thiab installation kev taw qhia
Lub kaum sab xis saib ntawm lub vijtsam tawg (xws li 6 teev sawv ntxov thiab 12 teev saib cov ces kaum) yuav tsum ua raws li tus neeg siv cov kev taw qhia saib. Yog tias ntsia rov qab, nws yuav ua rau txo qis hauv kev pom qhov sib txawv. Piv txwv li, lub tsheb dashboard qhia pom qhov muag plooj ntawm tus lej "3" raws li "E" nyob rau hauv lub teeb muaj zog vim yog qhov tsim yuam kev hauv lub kaum sab xis saib.
Kev daws:
Re pwm: Kho qhov taw qhia ntawm cov kua siv lead ua kua molecules (hloov cov txheej txheem ITO iav etching, nrog lub voj voog ntawm li 4 lub lis piam).
Software them nyiaj: Rov qab tso saib cov ntaub ntawv los ntawm kev tsav tsheb algorithms (tsuas yog siv tau rau cov cim yooj yim, cov duab nyuaj yuav raug cuam tshuam).
Pom daim ntawv lo: Kos qhov pom lub kaum sab xis ntawm cov khoom casing kom tsis txhob muaj neeg siv yuam kev.
3, Cov txheej txheem ntau lawm: kev tswj xyuas zoo los ntawm cov khoom siv raw mus rau cov khoom tiav
1. LCD cov khoom paug thiab cov txheej txheem tsis raug
Thaum lub sij hawm tsim cov txheej txheem ntawm cov ntxaij vab tshaus LCD, yog tias PI (polyimide) txheej yog khawb los yog cov fibers sib xyaw, nws tuaj yeem ua rau cov zaub stains lossis kab dub. Piv txwv li, ib pawg ntawm cov hluav taws xob ntsuas hluav taws xob cov ntxaij vab tshaus pom cov kab dawb ntsug, uas tau pom tias muaj khawb ntawm PI txheej.
Kev daws:
Kev tswj kev huv: Thaum lub sij hawm tsim khoom hauv Chav Kawm 100, cov neeg ua haujlwm yuav tsum hnav plua plav- khaub ncaws dawb.
AOI nrhiav pom: Qhia cov cuab yeej siv kho qhov muag tsis siv neeg los tshuaj xyuas qhov tsis xws luag hauv PI txheej thiab polarizers.
Kev soj ntsuam tuaj: Ua qhov chaw kuaj xyuas ntawm cov khoom siv LCD kom paub tseeb tias tsis muaj impurities xws li fibers lossis hais.
2. Backlight attenuation thiab kub adaptability
Lub teeb attenuation ntawm LED backlight yog ib qho ntawm cov laj thawj tseem ceeb rau qhov dimness ntawm lub vijtsam tawg. Yog tias qhov ntsuas kub ua haujlwm siab tshaj qhov ntau (xws li -20℃~{2}} degree), nws yuav ua kom lub teeb tawg. Piv txwv li, tom qab siv cov khoom siv sab nraum zoov hauv qhov chaw qis qis rau 3 lub hlis, qhov ci ntsa iab rov qab los ntawm 40%.
Kev daws:
LED xaiv: Txais qhov kub ntawm LED (xws li Samsung LH351B, ua haujlwm kub -40℃~ +100℃).
Thaum tshav kub kub dissipation tsim: Sau thermal conductive silicone roj ntawm lub backlight module thiab cov hlau casing kom txo tau qhov kub thiab txias.
Kev tsav tam sim no tsis tu ncua: Siv cov chips tam sim no tsis tu ncua xws li LM3404 kom tsis txhob muaj teeb pom kev zoo los ntawm kev hloov pauv tam sim no.
4, Environmental adaptability optimization: validation ntawm chav kuaj mus rau qhov chaw
1. Kev tiv thaiv hluav taws xob cuam tshuam (EMI).
Hauv kev lag luam ib puag ncig, cov khoom siv xws li lub cev muaj zog thiab zaus hloov pauv tuaj yeem tsim hluav taws xob cuam tshuam, ua rau cov khoom tsis zoo ntawm lub vijtsam tawg. Piv txwv li, thaum ib qho kev txhaj tshuaj molding tshuab tswj vaj huam sib luag khiav, tus lej "7" flashes nquag.
Kev daws:
Shielding tsim: Muab cov ntawv ci tooj liab rau tom qab ntawm lub vijtsam thiab hauv av los ntawm cov nplaum nplaum.
Filter circuit: Ntxiv ib π - hom lim (xws li C1=10 μ F, L1=100 μ H, C2=0.1 μ F) ntawm lub tswv yim ntawm lub zog tsav tsheb.
Cov kab lus tshwj xeeb: Cais cov kab teeb liab ntawm cov kab hluav taws xob, nrog qhov sib nrug ntawm Ntau dua lossis sib npaug li 10mm.
2. Kev vibration thiab kev tiv thaiv kev cuam tshuam
Hauv kev ua haujlwm ntawm kev tsheb ciav hlau, kev siv tshuab engineering, thiab lwm yam, kev co tuaj yeem ua rau cov pins ntawm lub vijtsam tawg code kom loosen. Piv txwv li, thaum lub sij hawm excavation txheej txheem, lub dashboard ntawm lub shield tshuab qhia ib tug residual duab ntawm tus xov tooj "0" li "8".
Kev daws:
Kev txhim kho kev poob siab: Sau silicone ua npuas ncauj (xws li PORON 4701-30-2000F) ntawm lub vijtsam thiab lub casing.
Locking qauv: Txais kev kho dual ntawm "screw + buckle" kom tsis txhob muaj kev hloov pauv hauv kev vibration.
Dynamic testing: Simulate cov kev ua haujlwm tiag tiag (xws li zaus 10Hz ~ 500Hz, acceleration 5g) los ntawm lub rooj vibration los txheeb xyuas kev ntseeg tau.
5, Kev txheeb xyuas qhov xwm txheej: Tag nrho cov txheej txheem los ntawm kev ua tsis tiav los kho
Case 1: Ib yam khoom ntawm lub tshuab cua txias cov chaw taws teeb tswj tsis tiav
Fault phenomenon: Tus mob stroke nyob rau hauv lub kaum sab xis ntawm tus lej "8" ploj lawm, thiab qee zaus nws rov zoo thaum nias tus yuam sij.
Kev txheeb xyuas keeb kwm:
Cov kab txaij zebra tsis kho, ua rau kev sib cuag tsis zoo thaum nias los ntawm tus neeg siv.
Tsav tsheb voltage hloov pauv ( ntsuas ntawm 3.1V ~ 3.4V).
Kev daws:
Hloov nrog hlau PIN pin sib txuas thiab ntxiv cov ntawv tso npe.
Ntxiv LM4040 voltage regulator nti nyob rau hauv lub tsav tsheb Circuit Court kom stabilize qhov voltage ntawm 3.3V.
Lo rau 0.3mm tuab PC board rau ntawm qhov screen kom tsis txhob nias.
Kev txheeb xyuas cov txiaj ntsig: Tom qab kho, kev sim txuas ntxiv rau 72 teev tsis pom qhov txawv txav.
Case 2: Lub vijtsam ntawm cov cuab yeej kho mob nrog cov lej tawg yog qhov tsis zoo
Fault phenomenon: Tom qab 6 lub hlis ntawm kev siv, lub backlight brightness txo los ntawm 50%.
Kev txheeb xyuas keeb kwm:
LED backlight tsis siv tas li tsav tam sim no, thiab tam sim no fluctuates nrog voltage.
Qhov kub ua haujlwm tseem nyob ntawm 60℃rau lub sijhawm ntev (nrog rau qhov kev txwv siab ntawm 50 degree).
Kev daws:
Hloov nrog LM3404 tas li tsav tam sim no nti, teeb tsa tam sim no rau 15mA.
Txhim kho lub tshav kub dissipation qauv thiab ntxiv aluminium kub dab dej.
Hloov nrog kub resistant LED (xws li Osram LW R976, ua hauj lwm kub -40℃~ +85℃).
Kev txheeb xyuas qhov tshwm sim: Tom qab kho, lub teeb pom kev zoo nyob ruaj khov ntawm ntau dua 95% ntawm tus nqi pib.
