Kufuneka ibe yenye yobunzima bokutshintsha unikezelo lwamandla ukuze kusetyenziswe ubucukubhede Ibhodi PCB (uyilo olubi lwePCB lunokukhokelela kwimeko yokuba kungakhathaliseki ukuba iiparamitha zilungiswa njani na, ayisiyongozi). Isizathu kukuba kusekho izinto ezininzi eziqwalaselwayo xa ubeko PCB, ezifana: ukusebenza kombane, inkqubo umzila, iimfuno zokhuseleko, impembelelo EMC, njl Phakathi kwezinto eziqwalaselwayo, umbane yeyona isisiseko, kodwa EMC yeyona kunzima ukuyiqonda. . , Ingxaki yenkqubela phambili yeeprojekthi ezininzi ikwingxaki ye-EMC; masabelane nawe ngoyilo lwePCB kunye ne-EMC ukusuka kwiindlela ezingama-22.

Yeyiphi imiba ye-EMC ekufuneka iqwalaselwe xa uyilo lwePCB?

1. Isekethe ye-EMI yoyilo lwePCB inokuqhutywa ngokuzolileyo emva kokuqhelana nesekethe.

Impembelelo yesekethe engentla kwi-EMC inokucingelwa. Isihluzi kwisiphelo songeniso silapha; ubuthathaka boxinzelelo lokukhusela umbane; ukuxhathisa i-R102 ukukhusela i-inrush current (sebenzisana ne-relay ukunciphisa ilahleko); Ukuqwalaselwa okuphambili yindlela yokwahlula i-X capacitor kunye ne-Inductance ihambelana ne-Y capacitor yokucoca; kukho kwakhona ii-fuses ezichaphazela ukucwangciswa kwebhodi yokhuseleko; isixhobo ngasinye apha sibaluleke kakhulu, kwaye kufuneka ungcamle ngononophelo umsebenzi kunye nendima yesixhobo ngasinye. Inqanaba lobunzima be-EMC ekufuneka liqwalaselwe xa kuyilwa isekethe iyilwe ngokuzolileyo, njengokumisela amanqanaba amaninzi okucoca, inani le-Y capacitors, kunye nendawo. Ukukhetha ubungakanani be-varistor kunye nobungakanani bunxulumene ngokusondeleyo nemfuno yethu ye-EMC. Wamkele wonke umntu ukuba axoxe ngesekethe ye-EMI ebonakala ilula, kodwa icandelo ngalinye liqulethe inyaniso enzulu.

2. ISekethe kunye ne-EMC: (Eyona nto iqhelekileyo i-flyback main topology, jonga ukuba zeziphi iindawo eziphambili kwisekethe equlethe i-EMC mechanism).

Kukho iinxalenye ezininzi kwisekethe kulo mzobo ungasentla: impembelelo kwi-EMC ibaluleke kakhulu (qaphela ukuba inxalenye eluhlaza ayikho), njengemitha yemitha, wonke umntu uyazi ukuba i-electromagnetic field radiation is spatial, kodwa umgaqo osisiseko kukutshintsha i-magnetic flux, ehambelana nommandla osebenzayo onqamlezayo womhlaba wemagnethi. , Yeyiphi i-loop ehambelanayo kwisekethe. Umbane okhoyo unokuvelisa umbane wamagnetic, uvelisa umbane ozinzile, ongenakuguqulwa ube ngumbane wombane; kodwa umbane oguqukayo uvelisa indawo yamagnetic eguqukayo, kwaye umbane oguquguqukayo unokuvelisa intsimi yombane (enyanisweni, le yi-equation eyaziwayo kaMaxwell, ndisebenzisa ulwimi olucacileyo), utshintsho Ngendlela efanayo, intsimi yombane inokuvelisa i-magnetic equation. intsimi. Ngoko qiniseka ukuba ubeke ingqalelo kwezo ndawo kunye namazwe okutshintsha, oko kungomnye wemithombo ye-EMC, nantsi enye yemithombo ye-EMC (apha, ngokuqinisekileyo, ndiya kuthetha ngezinye iinkalo kamva); umzekelo, iluphu enamachaphaza kwisekethe kukuvula ityhubhu yokutshintsha. Kwaye i-loop evaliweyo, ayisiyiyo kuphela isantya sokutshintsha esinokuhlengahlengiswa ukuze sichaphazele i-EMC xa uyila isekethe, kodwa kunye nendawo yelophu yebhodi inempembelelo ebalulekileyo! Ezinye iilophu ezimbini yiluphu yokufunxa kunye nelophu yokulungisa. Funda ngayo kwangaphambili kwaye uthethe ngayo kamva!

3. Umanyano phakathi koyilo lwePCB kunye ne-EMC.

1). Impembelelo ye-PCB loop kwi-EMC ibaluleke kakhulu, njenge-flyback main loop yamandla. Ukuba inkulu kakhulu, i-radiation iya kuba mbi.

2). Isiphumo socingo lwesihluzi. Icebo lokucoca lisetyenziselwa ukuhluza uphazamiseko ngaphandle, kodwa ukuba iingcingo zePCB azilunganga, isihluzo sinokuphulukana nesiphumo ebekufanele sibenaso.

3). Kwicandelo lolwakhiwo, ukunyanzeliswa kakubi koyilo lwe-radiator kuya kuchaphazela ukusekwa kwenguqu ekhuselekileyo, njl.

4). Iinxalenye ezithintekayo zisondele kakhulu kumthombo wokuphazamiseka, njengesekethe ye-EMI kunye netyhubhu yokutshintsha isondele kakhulu, ngokuqinisekileyo iya kukhokelela kwi-EMC ehluphekileyo, kunye nendawo ecacileyo yokwahlula iyafuneka.

5). RC absorption yesekethe umzila.

6). I-Y capacitor iphantsi kwaye ihanjiswe, kwaye indawo ye-Y capacitor nayo ibalulekile, njalo njalo.