Ezinye zisetyenziswa ngokuqhelekileyo PCB iindlela zokubeka

Ikakhulu i-interline crosstalk, izinto ezinempembelelo:

Indlela yeEngile yasekunene

Ngaba ucingo olukhuselekileyo

Ukuthelekisa i-impedance

Ukuqhuba umgca omde

Ukunciphisa ingxolo yemveliso

Isizathu yi diode reverse yangoku utshintsho ngesiquphe kunye loop isasazwe inductance. I-Diode junction capacitors yenza i-oscillation yokunciphisa i-high-frequency attenuation, kwaye uchungechunge olulinganayo lwe-inductance ye-filter capacitors yenza buthathaka indima yokucoca, ngoko ke isisombululo sokuphazamiseka kwincopho yokuguqulwa kwe-wave wave kukongeza ii-inductors ezincinci kunye ne-high frequency capacitors.

Kwi-diode, umbane ophezulu wokuphendula, ubuninzi be-voltage yangaphambili, i-reverse current, i-voltage eya phambili kunye ne-frequency yokusebenza kufuneka ithathelwe ingqalelo.

Iindlela ezisisiseko zokuchasene nokuphazamiseka kwamandla zezi:

Isilawuli sombane we-ac kunye nesihluzo samandla e-AC sisetyenziselwa ukukhangela kunye nokwahlula isiguquli samandla, kwaye i-varistor isetyenziselwa ukufunxa umbane wokutya. Kwimeko ekhethekileyo yokuba umgangatho wokubonelela ngombane uphezulu kakhulu, isethi ye-generator okanye i-inverter ingasetyenziselwa ukunikezelwa kwamandla, njenge-intanethi ye-UPS engaphazamiseki. Yamkela unikezelo lwamandla olwahlukileyo kunye nokwahlulwa kwamandla ombane. I-decoupling capacitor idityaniswe phakathi konikezelo lwamandla lwePCB nganye kunye nomhlaba. Amanyathelo okukhusela kufuneka athathwe kwiziguquli zamandla. I-TVS ye-Transient voltage suppressor yasetyenziswa. I-TVS sisixhobo sokhuseleko sesekethe esisetyenziswa kakhulu esinokuthi sifunxe amandla otyando ukuya kuthi ga kwii-kilowatts ezininzi. I-TVS isebenza ngokukodwa ngokuchasene nombane ongatshintshiyo, umbane ogqithisiweyo, uphazamiseko lwegridi, ukubetha kombane, ukucinywa kombane, ukubuyisela umva kwamandla kunye nengxolo yemoto/yamandla kunye nokungcangcazela.

Ukutshintshela i-analog yamajelo amaninzi: Kwindlela yokulinganisa kunye nolawulo, ubungakanani obulawulwayo kunye nelophu elinganisiweyo idla ngokuba ziindlela ezininzi okanye ezininzi. Iisekethe eziqhelekileyo ze-A / D kunye ne-D / A zihlala zisetyenziselwa i-A / D kunye ne-D / A ukuguqulwa kweeparamitha ezininzi. Ngoko ke, ukutshintshwa kwe-analog ye-multi-channel isoloko isetyenziselwa ukutshintsha indlela phakathi kwesiphaluka ngasinye esilawulwayo okanye esivavanyiweyo kunye ne-A / D kunye ne-D / A yokuguqulwa kwesiphaluka ngokulandelelana, ukuze kufezekiswe injongo yokulawula ukwabelana kwexesha kunye nokufumanisa okujikelezayo. Iimpawu zokufaka ezininzi zixhunywe kwi-amplifier okanye i-A / D converter ngokusebenzisa i-multiplexer ngendlela ye-single-terminal kunye nokudibanisa okungafaniyo, okunamandla okuthintela ukuphazamiseka.

I-Transients iyenzeka xa i-multiplexer itshintsha ukusuka kwelinye itshaneli ukuya kwelinye, ibangela i-spike edlulayo kwi-voltage kwimveliso. Ukuze kupheliswe impazamo evezwe yile nto, isekethe yesampulu phakathi kokuphuma kwe-multiplexer kunye ne-amplifier ingasetyenziswa, okanye indlela yokulibaziseka kwesoftware.

Igalelo le-multiplex converter lihlala lingcoliswa ziingxolo ezahlukeneyo zokusingqongileyo, ngakumbi ingxolo yemowudi eqhelekileyo. Imowudi eqhelekileyo ikrwitsha iqhagamshelwe kwisiphelo segalelo lesiguquli se-multiplex ukucinezela ingxolo yemowudi ephindaphindwayo eqhelekileyo eyaziswa ngabenzi boluvo bangaphandle. Ingxolo ephezulu yefrikhwensi eveliswayo ngexesha lesampulu ephezulu yesiguquli ayichaphazeli nje ukuchaneka komlinganiselo, kodwa inokubangela ukuba isilawuli esincinci siphulukane nolawulo. Kwangaxeshanye, ngenxa yesantya esiphezulu seSCM, ikwangumthombo omkhulu wengxolo wokuguqulela imultiplex. Ngoko ke, i-coupler ye-photoelectric kufuneka isetyenziswe phakathi kwe-microcontroller kunye ne-A / D yodwa.

Sesandisi: Ukukhethwa kweamplifier ngokubanzi kusebenzisa i-amplifier edibeneyo yokusebenza eyahlukileyo. Kwindawo yokusebenza yenzwa enzima kunye nobunzima, i-amplifier yokulinganisa kufuneka ikhethwe. Ineempawu ze-impedance ephezulu yegalelo, i-impedance ephantsi yokuphuma, ukuchasana okunamandla ekuphazamisekeni kwemowudi eqhelekileyo, i-drift yeqondo lokushisa eliphantsi, i-voltage ephantsi ye-offset kunye nokuzuza okuphezulu okuzinzileyo, ukwenzela ukuba isetyenziswe ngokubanzi njenge-preamplifier kwinkqubo yokubeka iliso yesignali ebuthathaka. Izandisi zokwahlula zingasetyenziselwa ukuthintela ingxolo yendlela eqhelekileyo ukuba ingangeni kwinkqubo. I-amplifier ye-Isolation ineempawu zomgca olungileyo kunye nokuzinza, umlinganiselo ophezulu wokulahlwa kwendlela eqhelekileyo, isekethe yesicelo esilula kunye nokuzuza okuguquguqukayo kokukhulisa. Imodyuli ye-2B30 / 2B31 ene-amplification, ukucoca kunye nemisebenzi yokuvuselela inokukhethwa xa usebenzisa inzwa yokumelana. I-adapter yesignali yokuchasana ngokuchaneka okuphezulu, ingxolo ephantsi kunye nemisebenzi epheleleyo.

I-impedance ephezulu yazisa ingxolo: Igalelo eliphezulu le-impedance livakalelwa kwigalelo langoku. Oku kwenzeka ukuba isikhokelo esivela kwigalelo eliphezulu le-impedance sisondele kwisikhokelo esine-voltage eguqukayo ngokukhawuleza (efana nedijithali okanye umgca wesignali yewotshi), apho intlawulo idibaniswa ne-impedance ephezulu ekhokelela kwi-parasitic capacitance.

Ubudlelwane phakathi kweentambo ezimbini buboniswe kuMfanekiso 7. Kumzobo, ixabiso le-parasitic capacitance phakathi kweentambo ezimbini zixhomekeke ikakhulu kumgama phakathi kweentambo (d) kunye nobude beentambo ezimbini ezisele zihambelana (L). Ukusebenzisa le modeli, yangoku eyenziwe kwiingcingo zombane eziphezulu zilingana ne: I=C dV/dt

Apho: Ndingumbane we-wiring ephezulu, i-C lixabiso le-capacitance phakathi kwee-wiri ze-PCB, i-dV lutshintsho lwe-voltage ye-wiring kunye nesenzo sokutshintsha, i-dt lixesha elithathayo ukuba i-voltage itshintshe ukusuka kwinqanaba ukuya kwinqanaba elilandelayo.

Kwintambo yeenyawo ze-RESET kwi-resistance ye-20K, iphucula kakhulu ukusebenza kwe-anti-interference, ukuchasana kufuneka kuxhomekeke kwi-CPU yokusetha kwakhona unyawo.