Ngenxa yeempawu zokutshintsha kombane wokutshintsha, kulula ukubangela unikezelo lombane lokutshintsha ukuvelisa ukuphazamiseka okukhulu kokuhambelana kwe-electromagnetic. Njengenjineli yobonelelo lwamandla, injineli ehambelana ne-electromagnetic, okanye injineli yoyilo lwePCB, kuya kufuneka uqonde oonobangela beengxaki zokuhambelana kwe-electromagnetic kwaye uzisombulule iindlela, ngakumbi iinjineli zoyilo kufuneka zazi indlela yokuphepha ukwanda kweendawo ezimdaka. Eli nqaku ikakhulu lazisa amanqaku aphambili ombane uyilo lwePCB.

1. Imigaqo emininzi esisiseko: naluphi na ucingo lune-impedance; yangoku ihlala ikhetha ngokuzenzekelayo umendo ngowona mqobo uncinci; ubunzulu bemitha bunxulumene nangoku, amaza, kunye nendawo yelophu; uphazamiseko lwemowudi eqhelekileyo inxulumene namandla ahlukeneyo eempawu ezinkulu zedv/dt emhlabeni; Umgaqo wokunciphisa i-EMI kunye nokuphucula amandla okuthintela ukuphazamiseka kuyafana.

2. Isakhiwo kufuneka sahlulwe ngokungqinelana nombane, i-analog, i-high-speed digital kunye nebloko nganye esebenzayo.

3. Nciphisa indawo yelophu enkulu ye-di/dt kwaye unciphise ubude (okanye indawo, ububanzi bomgca wesignali ye-dv/dt enkulu). Ukunyuka kwendawo yokulandelela kuya kwandisa i-capacitance esasazwayo. Indlela eqhelekileyo yile: ukulandelela ububanzi Zama ukuba mkhulu ngokusemandleni, kodwa susa inxalenye engaphezulu), kwaye uzame ukuhamba ngomgca othe tye ukunciphisa indawo efihliweyo ukunciphisa i-radiation.

4. I-crosstalk inductive ibangelwa ikakhulu yi-di / dt loop enkulu (i-antenna ye-loop), kunye ne-induction intensity ihambelana ne-inductance yokubambisana, ngoko ke kubaluleke kakhulu ukunciphisa ukudibanisa kunye nale miqondiso (indlela ephambili kukunciphisa. indawo ye-loop kunye nokwandisa umgama); I-crosstalk yokwabelana ngesondo iveliswa ubukhulu becala ngeempawu ezinkulu ze-dv/dt, kwaye ukuqina kokungeniswa kuhambelana nomthamo ofanayo. Zonke i-capacitances ezihambelanayo kunye nale miqondiso ziyancipha (indlela ephambili kukunciphisa indawo yokudibanisa esebenzayo kunye nokwandisa umgama. I-capacitance yokubambisana iyancipha ngokunyuka komgama. Ngokukhawuleza) kubaluleke kakhulu.

5. Zama ukusebenzisa umgaqo wokucinywa kwelophu ukunciphisa ngakumbi indawo yedi/dt loop enkulu, njengoko kubonisiwe kuMfanekiso 1 (ngokufanayo nesibini esijijekileyo.
Sebenzisa umgaqo wokurhoxiswa kwe-loop ukuphucula isakhono sokuchasana nokuphazamiseka kunye nokwandisa umgama wothumelo):

Umzobo 1, ukucinywa kweLoop (i-loop yasimahla yesekethe ye-boost)

6. Ukunciphisa indawo ye-loop akugcini nje ukunciphisa i-radiation, kodwa kunciphisa i-loop inductance, okwenza ukusebenza kwesekethe kube ngcono.

7. Ukunciphisa indawo ye-loop kufuna ukuba siyile ngokuchanekileyo indlela yokubuyisela umkhondo ngamnye.

8. Xa ii-PCB ezininzi zidityanisiwe ngokusebenzisa iziqhagamshelo, kuyafuneka kwakhona ukuba kuqwalaselwe ukunciphisa ummandla welophu, ngakumbi kwimiqondiso emikhulu ye-di/dt, imiqondiso ephezulu okanye imiqondiso ebuthathaka. Kungcono ukuba ucingo olulodwa lwesignali luhambelana nocingo olulodwa lomhlaba, kwaye iingcingo ezimbini zisondele ngokusemandleni. Ukuba kuyimfuneko, iingcingo ezimbini ezijijekileyo zingasetyenziselwa ukudityaniswa (ubude besibini ngasinye socingo olujijekileyo buhambelana nenani elipheleleyo lokuphindaphinda kwengxolo yesiqingatha sobude bobude bobude). Ukuba uvula imeko yekhompyuter, unokubona ukuba ujongano lwe-USB phakathi kwebhodi yomama kunye nepaneli yangaphambili iqhagamshelwe ngeperi ejijekileyo, ebonisa ukubaluleka koqhagamshelo olujijekileyo lokulwa nokuphazamiseka kunye nokunciphisa radiation.

9. Kwikhebula ledatha, zama ukucwangcisa iingcingo ezininzi zomhlaba kwikhebula, kwaye wenze ezi ngcingo zomhlaba zihanjiswe ngokulinganayo kwikhebula, enokunciphisa ngokufanelekileyo indawo ye-loop.

10. Nangona ezinye iilayini zokudibanisa i-inter-board ziyimpawu ze-low-frequency signals, ngenxa yokuba ezi zibonakaliso ze-low-frequency ziqulethe ingxolo eninzi ye-high-frequency (ngokusebenzisa i-conduction kunye ne-radiation), kulula ukukhupha ezi ngxolo xa zingaphathwanga kakuhle.

11. Xa ufaka ii-wiring, qala uqwalasele imikhondo emikhulu yangoku kunye neetrayiti ezithanda ukusasazeka ngemitha.

12. Ukutshintsha izixhobo zamandla ngokuqhelekileyo zinezilophu ezi-4 zangoku: igalelo, imveliso, utshintsho, i-freewheeling, (Umfanekiso 2). Phakathi kwabo, igalelo kunye nemveliso yangoku i-loops iphantse yangoku ngokuthe ngqo, phantse akukho emi eyenziwayo, kodwa iphazamiseka lula; Ukutshintsha kunye nokuhamba ngokukhululekileyo iilophu zangoku zine-di/dt enkulu, efuna ukuhoywa.
Umzobo 2, iluphu yangoku yesekethe yeBuck

13. I-gate drive circuit ye-tube ye-mos (igbt) ngokuqhelekileyo iqulethe i-di / dt enkulu.

14. Musa ukubeka iisekethe zesignali ezincinci, ezifana nokulawula kunye neesekethe ze-analog, ngaphakathi kwangoku enkulu, i-frequency high and high voltage circuits ukuphepha ukuphazamiseka.

Iza kuqhubeka…..