I. Naka usayizi we-inrush current oklanywe kuzintambo ze-PCB
Ekuhlolweni, kuvame ukuhlangana nomklamo wokuqala we-PCB awukwazi ukuhlangabezana nezidingo zokuhlinzwa.Ukuklama konjiniyela abajwayelekile, kucatshangelwa kuphela ukwakheka kokusebenza kohlelo, njengomsebenzi wangempela wohlelo udinga kuphela ukuthwala i-1A yamanje, ukwakheka kuzoklanywa ngokwalokhu, kepha kungenzeka ukuthi uhlelo ludinga ukwakhiwa. yakhelwe ukuhlinza, ukuhlinza kwesikhashana ukufinyelela ku-3KA (1.2/50us & 8/20us), ngakho manje ngidlula ngo-1A womklamo wamanje osebenzayo, ukuthi ingafinyelela umthamo ongenhla wokuhlinza kwesikhashana?Okuhlangenwe nakho kwangempela kwephrojekthi ukusitshela ukuthi lokhu akunakwenzeka, ngakho-ke kwenziwa kanjani kahle?Nansi indlela yokubala izintambo ze-PCB ezingasetshenziswa njengesisekelo sokuthwala i-current esheshayo.
Isibonelo: ububanzi obungu-0.36mm befoyili yethusi engu-1oz, ugqinsi lwemigqa engu-35um ekuhlinzeni kwamanje okuwunxande okungu-40us, ubuningi bamanje obungena ngaphakathi buba ngu-580A.Uma ufuna ukwenza idizayini yokuvikela engu-5KA (8/20us), ingaphambili lezintambo ze-PCB kufanele libe yi-foil yethusi engu-2 oz ububanzi obungu-0.9mm.Imishini yokuphepha ingafaneleka ukukhulula ububanzi.
II.Naka isakhiwo sezingxenye zembobo ekhuphukayo kufanele kube izikhala eziphephile
Idizayini yembobo ye-surgeon ngaphezu kwesikhala sethu esivamile sokuphepha kwedizayini ye-voltage yokusebenza, kufanele futhi sicabangele isikhala sokuphepha sokukhuphuka kwesikhashana.
Kumklamo ojwayelekile kagesi wokusebenza lapho isikhala sokuphepha singabhekisela emibhalweni efanele ye-UL60950.Ngaphezu kwalokho, sithatha i-UL ku-UL796 ejwayelekile ebhodini lesifunda eliphrintiwe elimelana nokuhlolwa kwe-voltage standard ingu-40V / mil noma 1.6KV / mm.Lesi siqondiso sedatha phakathi kwamakhondaktha e-PCB singamelana nesikhala sokuphepha sokuhlolwa kwe-voltage ye-Hipot siwusizo kakhulu.
Isibonelo, ngokuya nge-60950-1 Ithebula 5B, i-voltage yokusebenza engu-500V phakathi kwamakhondatha kufanele ihlangabezane nokuhlolwa kwe-voltage engu-1740Vrms, kanti ukuphakama okungu-1740Vrms kufanele kube ngu-1740X1.414 = 2460V.Ngokwezinga lokusetha elingu-40V/mil, ungakwazi ukubala isikhala phakathi kwamakhondatha amabili e-PCB akumele sibe ngaphansi kuka-2460/40 = 62mil noma u-1.6mm.
Nokukhuphuka okungaphezulu kwezinto ezijwayelekile ezingenhla okufanele uziqaphele, kodwa futhi unake usayizi wokuhlinza okusetshenzisiwe, kanye nezici zedivayisi yokuvikela ukukhulisa isikhala sokuphepha sibe sikhala esingu-1.6mm, umkhawulo ophezulu we-creepage voltage osikiwe ongu-2460V. , uma sinyusa i-voltage ifike ku-6KV, noma i-12KV, khona-ke ukuthi lesi sikhala sokuphepha sizokwanda yini kuncike ezicini zedivayisi yokuvikela i-voltage overvoltage, okuphinde kube Onjiniyela bethu abavame ukuhlangana nabo esivivinyweni lapho ukuhlinzwa kukhasa kakhulu.
Ceramic discharge tube, isibonelo, imfuneko 1740V ukumelana voltage, sikhetha idivayisi kufanele kube 2200V, futhi esimweni ukuhlinzwa ngenhla, ukukhishwa spike voltage yayo kufika ku-4500V, ngalesi sikhathi, ngokusho okungenhla. Ukubala, isikhala sethu sokuphepha sithi: 4500/1600 * 1mm = 2.8125mm.
III.Naka indawo yamadivayisi okuvikela ukugcwala kwe-overvoltage ku-PCB
Indawo yedivayisi yokuvikela imiswe ngokuyinhloko endaweni engaphambili yembobo evikelekile, ikakhulukazi uma imbobo inegatsha noma isifunda esingaphezu kwelilodwa, uma isethiwe ukudlula noma ukuhlehlela emuva, ukusebenza komphumela wayo wokuvikela kuzoncipha kakhulu.Eqinisweni, ngezinye izikhathi ngenxa yokuthi indawo ayanele, noma ngenxa yobuhle besakhiwo, lezi zindaba zivame ukukhohlwa.
IV.Naka indlela enkulu yokubuya yamanje
Indlela enkulu yokubuyisela yamanje kufanele ibe seduze nendawo yamandla noma igobolondo lomhlaba, uma indlela iba yinde, i-impedance enkulu yokubuya, ubukhulu bamanje obudlulayo obubangelwa ukuphakama kwezinga eliphansi, umthelela wale voltage ama-chips amaningi mahle, kodwa futhi onecala langempela lokusetha kabusha isistimu, ukuvala ngaphandle.
Isikhathi sokuthumela: Jul-14-2022