1. Kev tsim cov slots thaum lub sij hawm tsim PCB txheej txheem suav nrog:
Slotting tshwm sim los ntawm kev faib hluav taws xob lossis hauv av dav hlau; Thaum muaj ntau yam khoom siv hluav taws xob sib txawv lossis thaj chaw ntawm PCB, nws feem ntau tsis tuaj yeem faib lub dav hlau tiav rau txhua lub zog hluav taws xob thiab hauv av network. Txoj hauv kev zoo tshaj plaws yog los yog ua lub zog faib lossis faib hauv av ntawm ntau lub dav hlau. Cov slots yog tsim los ntawm kev sib faib sib txawv ntawm tib lub dav hlau.
Lub qhov los ntawm qhov yog tuab dhau los ua cov qhov (los ntawm qhov muaj xws li cov ntaub qhwv thiab vias); thaum lub qhov hla dhau los ntawm cov txheej hauv av lossis cov txheej txheem hluav taws xob tsis muaj hluav taws xob txuas rau lawv, qee qhov chaw yuav tsum tau tso tseg nyob ib ncig ntawm lub qhov los ntawm qhov sib cais hluav taws xob; tab sis thaum lub qhov los ntawm qhov Thaum lub qhov nyob ze heev ua ke, lub spacer rings overlap, slots tsim.
2. Qhov cuam tshuam ntawm slotting ntawm EMC kev ua tau zoo ntawm PCB version
Grooving yuav muaj qee yam cuam tshuam rau EMC kev ua haujlwm ntawm PCB pawg thawj coj saib. Qhov kev cuam tshuam no yuav tsis zoo lossis zoo. Ua ntej peb yuav tsum to taub qhov saum npoo tam sim no faib ntawm high-speed signals thiab low-speed signals. Ntawm qhov qis qis, tam sim no ntws raws txoj kev ntawm qhov tsis kam qis tshaj. Daim duab hauv qab no qhia tau hais tias yuav ua li cas thaum lub caij nyoog qis qis ntws los ntawm A mus rau B, nws cov teeb liab rov qab los ntawm lub dav hlau hauv av mus rau qhov chaw. Nyob rau lub sijhawm no, qhov kev faib tawm saum npoo av yog dav dua.
Nyob rau hauv high speeds, cov nyhuv ntawm inductance ntawm lub teeb liab rov qab txoj kev yuav ua tau ntau tshaj cov nyhuv ntawm kuj. High-speed rov qab teeb liab yuav ntws raws txoj kev ntawm impedance qis tshaj. Lub sijhawm no, qhov chaw faib khoom tam sim no yog nqaim heev, thiab cov teeb liab xa rov qab yog concentrated nyob rau hauv cov teeb liab kab hauv ib pob.
Thaum muaj cov kab hluav taws xob tsis sib xws ntawm PCB, yuav tsum tau ua "kev sib cais hauv av", uas yog, cov dav hlau hauv av tau teem caij sib txawv raws li qhov sib txawv ntawm cov hluav taws xob hluav taws xob sib txawv, cov teeb liab digital thiab analog teeb liab, high-speed thiab low-speed signals, thiab high-tam sim no. thiab cov teeb liab tam sim no. Los ntawm kev faib tawm ntawm cov teeb liab siab ceev thiab qis-ceev teeb liab rov qab tau muab los saum toj no, nws tuaj yeem nkag siab yooj yim tias kev sib cais hauv av tuaj yeem tiv thaiv qhov superposition ntawm cov teeb liab rov qab los ntawm qhov tsis sib xws thiab tiv thaiv cov kab hauv av impedance coupling.
Tab sis tsis hais txog cov teeb liab siab ceev lossis cov teeb liab qis, thaum cov kab teeb liab hla cov kab hluav taws xob los yog lub dav hlau hauv av, ntau yam teeb meem loj yuav tshwm sim, suav nrog:
Ua kom lub voj voog tam sim no nce lub voj inductance, ua rau cov zis waveform yooj yim rau oscillate;
Rau cov kab hluav taws xob kub ceev uas yuav tsum tau tswj xyuas nruj impedance thiab raug xa mus raws li cov qauv stripline, cov qauv stripline yuav raug puas tsuaj vim yog qhov slotting ntawm lub dav hlau sab sauv los yog qis dua lub dav hlau los yog lub dav hlau sab sauv thiab qis, uas ua rau impedance discontinuity thiab loj heev. teeb liab kev ncaj ncees. teeb meem kev sib deev;
Ua kom muaj hluav taws xob emissions rau hauv qhov chaw thiab muaj kev cuam tshuam los ntawm qhov chaw sib nqus;
Lub high-frequency voltage poob rau ntawm lub voj inductance yog ib hom hluav taws xob qhov chaw, thiab hom hluav taws xob hom yog generated los ntawm sab nraud cables;
Ua kom muaj peev xwm ntawm high-frequency teeb liab crosstalk nrog rau lwm yam circuits ntawm lub rooj tsavxwm.
Thaum muaj cov kab hluav taws xob tsis sib xws ntawm PCB, yuav tsum tau ua "kev sib cais hauv av", uas yog, cov dav hlau hauv av tau teem caij sib txawv raws li qhov sib txawv ntawm cov hluav taws xob hluav taws xob sib txawv, cov teeb liab digital thiab analog teeb liab, high-speed thiab low-speed signals, thiab high-tam sim no. thiab cov teeb liab tam sim no. Los ntawm kev faib tawm ntawm cov teeb liab siab ceev thiab qis-ceev teeb liab rov qab tau muab los saum toj no, nws tuaj yeem nkag siab yooj yim tias kev sib cais hauv av tuaj yeem tiv thaiv qhov superposition ntawm cov teeb liab rov qab los ntawm qhov tsis sib xws thiab tiv thaiv cov kab hauv av impedance coupling.
Tab sis tsis hais txog cov teeb liab siab ceev lossis cov teeb liab qis, thaum cov kab teeb liab hla cov kab hluav taws xob los yog lub dav hlau hauv av, ntau yam teeb meem loj yuav tshwm sim, suav nrog:
Ua kom lub voj voog tam sim no nce lub voj inductance, ua rau cov zis waveform yooj yim rau oscillate;
Rau cov kab hluav taws xob kub ceev uas yuav tsum tau tswj xyuas nruj impedance thiab raug xa mus raws li cov qauv stripline, cov qauv stripline yuav raug puas tsuaj vim yog qhov slotting ntawm lub dav hlau sab sauv los yog qis dua lub dav hlau los yog lub dav hlau sab sauv thiab qis, uas ua rau impedance discontinuity thiab loj heev. teeb liab kev ncaj ncees. teeb meem kev sib deev;
Ua kom muaj hluav taws xob emissions rau hauv qhov chaw thiab muaj kev cuam tshuam los ntawm qhov chaw sib nqus;
Lub high-frequency voltage poob rau ntawm lub voj inductance yog ib hom hluav taws xob qhov chaw, thiab hom hluav taws xob hom yog generated los ntawm sab nraud cables;
Ua kom muaj peev xwm ntawm high-frequency teeb liab crosstalk nrog rau lwm yam circuits ntawm lub rooj tsavxwm
3. PCB tsim txoj kev rau slotting
Kev ua cov grooves yuav tsum ua raws li cov hauv qab no:
Rau high-ceev teeb liab kab uas yuav tsum tau nruj impedance tswj, lawv cov kab yog nruj me ntsis txwv tsis pub hla txoj kab sib faib kom tsis txhob ua rau impedance discontinuity thiab ua rau muaj teeb meem loj kev ncaj ncees;
Thaum muaj cov kab hluav taws xob tsis sib xws ntawm PCB, kev sib cais hauv av yuav tsum tau ua, tab sis kev sib cais hauv av yuav tsum tsis txhob ua rau cov kab hluav taws xob ceev kom hla cov kab sib faib, thiab sim tsis txhob ua rau cov kab hluav taws xob qis kom hla kev sib faib thaiv;
Thaum routing hla cov slots yog yam tsis muaj kev zam, kev txuas yuav tsum tau ua;
Lub connector (sab nraud) yuav tsum tsis txhob muab tso rau hauv av txheej. Yog tias muaj qhov sib txawv loj ntawm qhov point A thiab point B ntawm cov txheej hauv av hauv daim duab, ntau hom hluav taws xob yuav raug tsim los ntawm cov kab hluav taws xob sab nraud;
Thaum tsim PCBs rau high-density connectors, tshwj tsis yog tias muaj cov kev cai tshwj xeeb, koj yuav tsum feem ntau xyuas kom meej tias hauv av network puag ncig txhua tus pin. Koj tuaj yeem npaj cov av sib npaug sib npaug thaum npaj cov pins kom ntseeg tau tias qhov txuas ntxiv ntawm lub dav hlau hauv av thiab tiv thaiv kev tsim cov slotting.