Ib txhia nquag siv PCB layout txoj kev

Feem ntau interline crosstalk, muaj feem cuam tshuam:

Txoj cai kaum routing

Nws shielded hlau

Impedance txuam

Ntev kab tsav

Txo cov suab nrov

Yog vim li cas yog diode thim rov qab tam sim no hloov pauv sai thiab voj faib inductance. Diode hlws ris capacitors tsim high-frequency attenuation oscillations, thiab qhov sib npaug series inductance ntawm lim capacitors tsis muaj zog lub luag hauj lwm ntawm filtering, yog li kev daws rau lub ncov cuam tshuam nyob rau hauv cov zis waveform hloov kho yog ntxiv me me inductors thiab siab zaus capacitors.

Rau diodes, qhov siab tshaj plaws teb voltage, siab tshaj plaws rau pem hauv ntej tam sim no, rov qab tam sim no, rau pem hauv ntej voltage poob thiab kev khiav hauj lwm zaus yuav tsum tau txiav txim siab.

Cov txheej txheem tseem ceeb ntawm lub zog tiv thaiv kev cuam tshuam yog:

Lub ac voltage regulator thiab AC fais fab lim yog siv los tshuaj ntsuam thiab cais lub zog transformer, thiab varistor yog siv los nqus cov surge voltage. Nyob rau hauv cov ntaub ntawv tshwj xeeb uas lub hwj chim mov zoo heev, lub generator teeb los yog inverter yuav siv tau rau lub hwj chim mov, xws li hauv internet UPS uninterrupted fais fab mov. Txais cov khoom siv hluav taws xob sib cais thiab kev faib hluav taws xob. Ib tug decoupling capacitor yog txuas ntawm lub hwj chim mov ntawm txhua PCB thiab hauv av. Kev tiv thaiv kev ntsuas yuav tsum tau ua rau lub hwj chim transformers. Transient voltage suppressor TVS tau siv. TVS yog cov cuab yeej siv hluav taws xob tiv thaiv hluav taws xob uas muaj peev xwm nqus tau hluav taws xob ntau txog li ob peb kilowatts. TVS tshwj xeeb tshaj yog tiv thaiv hluav taws xob zoo li qub, overvoltage, kab sib cuam tshuam, xob laim tawm tsam, hloov hluav taws xob, hluav taws xob rov qab thiab lub cev muaj zog / lub suab nrov thiab kev co.

Multichannel analog hloov: Hauv kev ntsuas thiab tswj qhov system, tswj kom muaj nuj nqis thiab ntsuas lub voj voog feem ntau yog ob peb lossis kaum ob txoj hauv kev. Feem ntau A / D thiab D / A hloov dua siab tshiab circuits feem ntau siv rau A / D thiab D / A kev hloov pauv ntawm ntau qhov tsis sib xws. Yog li ntawd, ntau lub channel analog hloov feem ntau yog siv los hloov txoj hauv kev ntawm txhua qhov kev tswj hwm lossis ntsuas Circuit Court thiab A / D thiab D / A hloov pauv hloov pauv hloov pauv hloov pauv, txhawm rau ua tiav lub hom phiaj ntawm kev sib koom tswj lub sijhawm thiab kev tshawb nrhiav pom. Ntau lub tswv yim tawm tswv yim txuas nrog lub amplifier lossis A / D converter los ntawm multiplexer los ntawm txoj kev ntawm ib lub davhlau ya nyob twg thiab qhov sib txawv, uas muaj peev xwm tiv thaiv kev cuam tshuam.

Transients tshwm sim thaum lub multiplexer hloov los ntawm ib qho channel mus rau lwm qhov, ua rau lub sijhawm hloov pauv hauv qhov hluav taws xob ntawm cov zis. Txhawm rau tshem tawm qhov yuam kev los ntawm qhov tshwm sim no, ib qho piv txwv ntawm Circuit Court nruab nrab ntawm cov zis ntawm multiplexer thiab lub amplifier tuaj yeem siv, lossis cov qauv ntawm software ncua sij hawm.

Cov tswv yim ntawm multiplex converter yog feem ntau polluted los ntawm ntau yam ib puag ncig suab nrov, tshwj xeeb tshaj yog hom nrov nrov. Ib hom hom choke yog txuas nrog rau qhov kawg ntawm cov khoom siv multiplex converter txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau nws, nws yog ib qho tsim nyog yuav tsum coj mus rau hauv tus account qhov sib txawv ntawm cov kab mob sib kis. Lub suab nrov nrov tsim tawm thaum lub sijhawm hloov pauv qhov kev ntsuas siab tsis tsuas yog cuam tshuam rau qhov ntsuas qhov tseeb, tab sis kuj tuaj yeem ua rau lub microcontroller poob tswj. Nyob rau tib lub sijhawm, vim qhov kev kub ceev ntawm SCM, nws kuj yog lub suab nrov loj rau multiplex converter. Yog li ntawd, lub photoelectric coupler yuav tsum tau siv ntawm microcontroller thiab A / D cais.

Lub suab nrov: Kev xaiv ntawm amplifier feem ntau siv ntau qhov kev ua haujlwm sib xyaw ua ke amplifier. Nyob rau hauv lub complex thiab hnyav sensor ua hauj lwm ib puag ncig, lub ntsuas amplifier yuav tsum tau xaiv. Nws muaj cov yam ntxwv ntawm cov input impedance siab, tsis tshua muaj tso zis impedance, muaj zog tsis kam mus rau hom kev cuam tshuam, tsis tshua muaj kub drift, tsis tshua muaj offset voltage thiab siab ruaj khov nce, yog li nws yog dav siv los ua preamplifier hauv cov teeb liab tsis muaj zog xyuas. Kev rho tawm amplifiers tuaj yeem siv los tiv thaiv cov suab nrov nrov los ntawm kev nkag mus rau hauv lub cev. Kev rho tawm amplifier muaj cov yam ntxwv ntawm qhov zoo linearity thiab stability, siab ntau hom kev tsis lees paub piv, yooj yim daim ntawv thov Circuit Court thiab sib txawv amplification nce. Lub module 2B30 / 2B31 nrog amplification, filtering thiab excitation zog yuav xaiv tau thaum siv kuj sensor. Nws yog lub teeb liab tiv thaiv adapter nrog siab precision, tsis tshua muaj suab nrov thiab ua tiav cov haujlwm.

High impedance qhia suab nrov: High impedance input yog rhiab heev rau cov input tam sim no. Qhov no tshwm sim yog tias cov hlau lead los ntawm lub siab impedance input nyob ze rau ib tug txhuas nrog ib tug ceev hloov voltage (xws li ib tug digital los yog moos teeb liab kab), qhov twg tus nqi yog txuas mus rau lub siab impedance lead los ntawm parasitic capacitance.

Kev sib raug zoo ntawm ob lub cables yog qhia hauv daim duab 7. Nyob rau hauv daim duab, tus nqi ntawm parasitic capacitance ntawm ob lub cables feem ntau yog nyob ntawm qhov kev ncua deb ntawm cov cables (d) thiab qhov ntev ntawm ob lub cables nyob rau hauv parallel (L). Siv cov qauv no, tam sim no generated nyob rau hauv high-impedance thaiv yog sib npaug rau: I = C dV / dt

Qhov twg: Kuv yog tam sim no ntawm high-impedance thaiv, C yog tus nqi capacitance ntawm ob lub PCB thaiv, dV yog qhov hloov hluav taws xob ntawm cov xaim nrog kev hloov pauv, dt yog lub sijhawm nws yuav siv rau qhov voltage hloov ntawm ib theem mus rau qib tom ntej.

Nyob rau hauv RESET ko taw txoj hlua mus rau hauv 20K tsis kam, zoo heev txhim kho kev tiv thaiv kev cuam tshuam, qhov kev tawm tsam yuav tsum nyob ntawm CPU rov qab ko taw.