I. Chenjerera kuhukuru hweinrush current yakagadzirwa muPCB wiring
Muyedzo, kazhinji kusangana neiyo yekutanga dhizaini yePCB haigone kusangana nezvinodiwa zvekuvhiya.General mainjiniya dhizaini, ingofunga nezve dhizaini inoshanda yehurongwa, senge iro chairo basa reiyo system rinongoda kutakura 1A yemazuva ano, dhizaini ichagadzirwa zvinoenderana neizvi, asi zvinogoneka kuti iyo system inoda kugadzirwa. yakagadzirirwa kuvhiyiwa, kuvhiyiwa kwenguva pfupi kusvika pa3KA (1.2/50us & 8/20us), saka ikozvino ndinoenda ne1A yedhizaini chaiyo yekushanda ikozvino, ingave ichikwanisa kuzadzisa simba repamusoro rekuvhiya?Chiitiko chaicho chepurojekiti ndechekutiudza kuti izvi hazvibviri, saka kuita sei zvakanaka?Heino nzira yekuverenga iyo PCB wiring inogona kushandiswa sehwaro hwekutakura nekukasira ikozvino.
Semuenzaniso: 0.36mm hupamhi hwe1oz foil yemhangura, ukobvu 35um mitsetse mune 40us rectangular ikozvino surge, iyo yakanyanya inrush ikozvino inosvika 580A.Kana iwe uchida kuita 5KA (8/20us) dhizaini yekudzivirira, ipapo pamberi pePCB wiring inofanirwa kuve inonzwisisika 2 oz copper foil 0.9mm yakafara.Midziyo yekuchengetedza inogona kuve yakakodzera kuzorodza hupamhi.
II.Ngwarira kune yekusurge port ezvikamu marongerwo anofanirwa kuve akachengeteka nzvimbo
Surge port dhizaini mukuwedzera kune yedu yakajairwa yekushanda voltage dhizaini yekuchengetedza nzvimbo, isu tinofanirawo kufunga nezvekuchengetedza nzvimbo yekuvhiya kwenguva pfupi.
Pane yakajairwa yekushanda voltage dhizaini kana nzvimbo yekuchengetedza tinogona kunongedzera kune akakodzera zvirevo zveUL60950.Uye zvakare, isu tinotora UL mu UL796 yakajairwa mune yakadhindwa yedunhu bhodhi inomira voltage test standard ndeye 40V / mil kana 1.6KV / mm.Iyi dhairekitori yedata pakati pePCB conductor inogona kumirisana neHipot's instand voltage test kuchengetedza nzvimbo inobatsira zvikuru.
Semuyenzaniso, zvinoenderana ne60950-1 Tafura 5B, 500V kushanda magetsi pakati pemakondakita anofanira kunge ari kusangana ne1740Vrms anomira nevoltage test, uye 1740Vrms peak inofanira kunge iri 1740X1.414 = 2460V.Zvinoenderana ne40V/mil kuseta standard, unogona kuverenga nzvimbo iri pakati pemakondakita maviri ePCB haifanire kunge iri pasi pe2460/40 = 62mil kana 1.6mm.
Uye masurges mukuwedzera kune zviri pamusoro zvakajairwa zvinhu zvekucherekedza, asi zvakare tarisa kune saizi yekuvhiya yakashandiswa, uye hunhu hwemudziyo wekudzivirira kuwedzera nzvimbo yekuchengetedza kusvika 1.6mm spacing, iyo yakanyanya kuchekwa-kubvisa creepage voltage ye2460V. , kana isu takawedzera voltage kusvika ku6KV, kana kunyange 12KV, saka kana iyi nzvimbo yekuchengetedza ichiwedzera zvinoenderana nehunhu hwechidziviriro chekudzivirira kwekuwedzera, inova zvakare maInjiniya edu anowanzo sangana mukuyedza kana kuvhiya kuchikwira zvine ruzha.
Ceramic discharge chubhu, semuenzaniso, mukudiwa kwe1740V kushingirira voltage, tinosarudza mudziyo unofanirwa kunge uri 2200V, uye iri padanho rekukwira kuri pamusoro, kuburitsa kwayo spike voltage inosvika 4500V, panguva ino, zvinoenderana nezviri pamusoro. kuverenga, kuchengetedza nzvimbo yedu ndeye: 4500/1600 * 1mm = 2.8125mm.
III.Teerera kune nzvimbo ye overvoltage kudzivirira zvishandiso muPCB
Nzvimbo yemudziyo wekudzivirira inonyanya kuiswa panzvimbo yepamberi yechiteshi chekuchengetedza, kunyanya kana chiteshi chine anopfuura rimwe bazi kana dunhu, kana rakaiswa bypass kana kumashure chinzvimbo, mhedzisiro yayo yekudzivirira ichaderedzwa zvakanyanya.Muchokwadi, isu dzimwe nguva nekuti nzvimbo yacho haina kukwana, kana yeaesthetics yemagadzirirwo, nyaya idzi dzinowanzo kukanganikwa.
IV.Teerera kune yakakura ikozvino nzira yekudzoka
Yakakura yazvino nzira yekudzoka inofanirwa kunge iri padyo nemagetsi kana goko repasi, iyo yakareba nzira, yakakura iyo impedance yekudzoka, hukuru hukuru hwenguva pfupi yazvino inokonzerwa nekukwira kwepasi, kukanganisa kweiyo voltage pa akawanda machipisi akanaka, asi zvakare muparadzi chaiye weiyo system reset, kukiya.
Nguva yekutumira: Jul-14-2022