Yuav daws qhov teeb meem ESD nrog electrostatic tawm ntawm kev tiv thaiv lub xov tooj ntawm tes
Hluav taws xob hluav taws xob nyob txhua qhov chaw, thiab ESD cov teeb meem ntawm lub xov tooj txawb electrostatic tawm tsis tuaj yeem tsis quav ntsej. Nws yuav ua rau lub xov tooj ntawm tes tsis zoo, sib tsoo, lossis tseem ua puas thiab ua rau lwm cov teeb meem kev ruaj ntseg. Yog li no, ua ntej lub xov tooj ntawm tes tau tsim, Tuam Tshoj yuam kom lub network ntsuas, thiab lub network ntsuas kom pom tseeb kom yuav tsum ESD thiab lwm yam kev ntsuas mob siab. Ntawm lawv, kev tiv tauj kev sib cuag yuav tsum yog% 26, # 177; 8kV hluav taws xob zoo li qub, cua xa tawm yuav tsum ua kom tiav% 26; # 177; 15kV hluav taws xob zoo li qub, uas tso siab rau qhov tsim ntawm tsim ntawm ESD wristband chaw tsim tshuaj paus ESD.
Yuav ua li cas daws cov teeb meem ESD hauv xov tooj ntawm tes?
1, xov tooj txawb PCB tsim
Cov Ntawv Luam Circuit Circuit yog cov npib ntuag cov phaj siab, feem ntau 6-txheej cov laug cam. Raws li kev ntom ntom zuj zus, qhov sib txig sib luag yog siv 8-txheej cov laug cam, thiab lawv cov qauv siv yuav tsum xav txog qhov sib npaug ntawm kev ua tiav thiab thaj chaw. Ntawm ib sab tes, qhov chaw loj dua, ntau qhov chaw tau muab tso rau ntawm cov khoom siv. Nyob rau tib lub sijhawm, qhov nthuav dav ntawm kab thiab qhov dav ntawm txoj kab, muaj txiaj ntsig rau EMI, suab, ESD thiab lwm yam. Ntawm qhov tod tes, qhov kev cog lus ntawm lub xov tooj me me yog qhov qauv thiab xav tau. Yog li no, koj yuav tsum nrhiav kom pom qhov sib npaug thaum tsim qauv. Raws li qhov teeb meem ntawm ESD txhawj xeeb, muaj ntau qhov chaw yuav tsum tau them rau hauv kev tsim qauv, tshwj xeeb tshaj yog hais txog kev tsim ntawm GND cov xaim thiab kab rau lub caij.
Cov ntsiab lus kom nco ntsoov hauv PCB tus qauv:
(1) Qhov kev ncua deb ntawm pawg PCB pawg thawj coj saib (nrog rau ntawm lub qhov taub dhau ciam) thiab lwm qhov kev sib tw yuav tsum ntau dua 0.3mm;
(2) Lub rooj tsavxwm ntawm PCB zoo dua yog txhua qhov puag ncig los ntawm GND kab;
(3) Qhov kev ncua deb ntawm GND thiab lwm qhov hluav taws xob thaiv tau khaws cia ntawm 0.2 hli ~ 0.3 hli;
(4) Qhov kev ncua deb ntawm Vbat thiab lwm cov xov hlau yog cia ntawm 0.2 hli mus txog 0.3 hli;
(5) Qhov kev ncua deb ntawm cov kab tseem ceeb xws li Rov Tswm, Moos, thiab lwm yam thiab lwm qhov kev sib yuav yuav tsum muaj ntau dua 0.3 hli;
(6) Qhov kev ncua deb ntawm cov kab hluav taws xob loj xws li PA thiab lwm qhov kev sib tw tau khaws cia li ntawm 0.2 hli mus txog 0.3 hli;
(7) Yuav tsum muaj ntau yam vias (VIa) li sai tau ntawm GNDs ntawm ntau cov khaubncaws sab nraud povtseg;
(8) Tsis txhob ua rau cov ces kaum ntse nyob rau tom kawg paving. Cov ces kaum ntse yuav tsum swm li uas muaj peev xwm.
2, xov tooj txawb xov tooj cua tsim tsim
Hauv kev tsim qauv ntawm cov vaj tsev thiab PCB, tom qab them nyiaj rau ESD teeb meem, ESD yuav nkag mus tsis ncaj lub xov tooj ntawm tes, tshwj xeeb tshaj yog cov khoom siv hauv qab no: SIM daim npav CPU daim npav nyeem ntawv, keyboard Circuit, pob ntseg, microphone Circuit, cov ntaub ntawv sib cuam tshuam, lub zog interface, USB interface, xim LCD tsav tsheb interface, cov ntu no yuav tau qhia hluav taws xob zoo li qub los ntawm tib neeg lub cev mus rau lub xov tooj ntawm tes. Yog li, ESD tiv thaiv cov khoom siv yuav tsum tau siv rau hauv cov chaw no. Lub ntsiab tiv thaiv ESD tseem ceeb yog li hauv qab no:
(1) Cov pa tawm ntawm raj (GDT). Nws yog cov iav roj-nruj iav lossis cov nplais ceramic uas muaj cov roj hauv qhov hluav taws xob ruaj khov xws li helium lossis argon thiab tswj ntawm qee qhov siab. GDT muaj kev khiav dej loj txaus thiab muaj qhov nruab nrab me me interelectrode capacitance, uas tuaj yeem nrhiav tau los ntawm nws tus kheej. Qhov tsis zoo yog tias lub suab teb nrawm dua qeeb, qhov tso tawm hluav taws xob tsis yog qhov tseeb txaus, lub neej luv luv, thiab kev ua haujlwm hluav taws xob hloov nrog lub sijhawm.
(2) Varistor (MOV). Nws yog cov khoom siv ceramic uas "sinters" zinc oxide thiab ntxiv rau hauv qee yam mob. Qhov kev tawm tsam yog cuam tshuam los ntawm qhov hluav taws xob, thiab nws qhov tam sim no nce ceev vim tias qhov hluav taws xob nce. Tus varistor muaj lub cim hluav taws xob sab hauv loj loj, thiab nws qhov tsis zoo yog tias qhov kev teb tau qeeb, qhov kev ua tau zoo zuj zus vim kev siv ntau yam, thiab cov tshuaj hauv nruab nrab qhov nruab nrab yog qhov loj.
(3) Thyristor diode (TSS). Nws yog cov hluav taws xob semiconductor uas tsis coj ua thaum pib ntawm thyristor diode thiab nyob hauv lub xeev "thaiv". Thaum lub "overvoltage" nce mus rau "tawm voltage" ntawm thyristor, nws ua haujlwm thiab tsim hluav taws xob tawm tam sim no; thaum tam sim no poob qis rau tus nqi tsawg kawg, thyristor yuav "thaiv" dua thiab rov qab mus rau qhov qub "qhib xeev". ".
(4) Cov Hluav Taws Xob Hloov Hluav Taws Xob (TVS). Nws yog cov khoom siv semiconductor, vim tias nws cov yam ntxwv siab tshaj plaws yog cov lus teb ceev ceev (1 ns ~ 5 ns), tsis tshua muaj kev sib tshuam (1pf ~ 3pf), paug me me tam sim no (1μA) thiab ntws loj tsis kam, tshwj xeeb tshaj yog nws cov sib xyaw sib luag, nws yog heev haum rau kev tiv thaiv ntawm ntau yam cuam tshuam. Vim tias TVS muaj qhov zoo ntawm qhov loj me thiab teb ceev ceev, qhov kev faib ua feem ntawm TVS siv los ua tus tiv thaiv hauv qhov tsim qauv tam sim no nce. Thaum siv nws, ceev faj kom muab nws tso rau ib sab ntawm lub cuab yeej kom muaj kev tiv thaiv. Lub xaim rau hauv av yuav tsum muaj luv li sai tau. Cov xov xaim ntawm lub cuab yeej yuav tsum yog ua hauv kab, tab sis tsis nyob hauv ib txhij. Qhov teeb meem nrog ESD yog ib qho ntawm ntau qhov teeb meem tseem ceeb. Muaj ntau txoj hauv kev kom tsis txhob muaj kev puas tsuaj rau lub Circuit Court hauv cov khoom siv hluav taws xob sib txawv. Vim lub me me loj thiab lub siab ntawm lub xov tooj ntawm tes, nws muaj qhov tshwj xeeb hauv kev tiv thaiv ESD.
3, Tus qauv tsim los ntawm lub plhaub
Yog tias qhov tso tawm hluav taws xob zoo li yog dej nyab, yog li cov kev daws teeb meem zoo ib yam li kev tswj dej, uas yog "thaiv" thiab "sparing". Yog tias muaj cov plhaub zoo tagnrho uas yog airtight, tsis muaj hluav taws xob zoo li qub, yog li tsis muaj teeb meem zoo li qub. Txawm li cas los xij, lub rooj sib txig tiag tiag feem ntau muaj qhov khoob hauv cov npog, thiab ntau ntawm lawv muaj cov ntawv hlau dai kom zoo nkauj, yog li nco ntsoov them sai sai. Ua ntej, siv "kev thaiv" txoj kev. Sim ua kom qhov tuab ntawm casing, uas yog, nce qhov kev ncua deb ntawm lub casing thiab board, lossis nce qhov kev ncua deb ntawm cov huab cua sib txawv ntawm lub casing los ntawm qee txoj kev sib npaug, yog li kom tsis txhob muaj lossis txo ntau lub zog siv ntawm ESD. Los ntawm kev txhim kho ntawm tus qauv, qhov kev ncua deb ntawm kev sib tsoo sab nraud thiab sab hauv Circuit Court tuaj yeem raug ntxiv, yog li ntawd lub zog ntawm ESD raug txo ntau heev. Raws li txoj cai ntawm tus ntiv tes xoo, 8kV ESD feem ntau txiav txim siab mus rau xoom tom qab qhov nrug ntawm 4 hli. Thib ob, siv txoj kev "sib dhos", nws tuaj yeem txau rau sab hauv ntawm rooj plaub nrog EMI xim. Cov xim pleev xim EMI yog kev siv hluav taws xob thiab tuaj yeem xav txog kev siv hlau thaiv uas yog tso cai rau hluav taws xob zoo li qub rau ntawm lub tsev. Tom qab ntawd lub tsev nyob txuas nrog hauv av ntawm PCB (Printed Circuit Board) los ua hluav taws xob zoo li qub deb ntawm av. Ntxiv rau kev tiv thaiv hluav taws xob zoo li qub, txoj kev ntawm qhov kev kho no tuaj yeem tiv thaiv EMI cuam tshuam tau zoo. Yog tias muaj chaw txaus, koj tseem tuaj yeem tiv thaiv lub voj voos nrog daim hlau thaiv, uas tom qab ntawd txuas nrog GND ntawm PCB. Tiv thaiv qhov module nrog daim hlau thaiv. Hauv ntej, muaj ntau qhov chaw yuav tsum paub txog ESD cov tsev tsim qauv. Thawj kauj ruam yog los tiv thaiv ESD ntawm kev nkag mus rau sab hauv ntawm lub tsev thiab txo qis lub zog nkag mus hauv tsev. Txog rau ESD nkag mus rau sab hauv ntawm rooj plaub, sim coj nws kom deb ntawm GND thiab tsis txhob cia nws ua rau lwm qhov sib luag ntawm Circuit Court. Kev saib xyuas yuav tsum tau saib xyuas thaum siv cov hlau dai rau ntawm rooj plaub, vim tias nws yuav coj tau qhov tshwm sim uas tsis xav tau thiab xav tau tshwj xeeb.