Mfundo zazikuluzikulu za ma waya a PCB pamene anti-surge ndi ziti?

I. Samalani kukula kwa ma inrush panopa opangidwa mu mawaya a PCB

Mu mayeso, nthawi zambiri amakumana ndi mapangidwe oyambirira a PCB sangathe kukwaniritsa zosowa za opaleshoni.Kapangidwe ka mainjiniya ambiri, amangoganizira momwe magwiridwe antchito amagwirira ntchito, monga momwe ntchito yeniyeni ya dongosololi imafunikira kunyamula 1A yapano, kapangidwe kake kapangidwe molingana ndi izi, koma ndizotheka kuti dongosololi liyenera kukhala. yopangidwira maopaleshoni, maopaleshoni osakhalitsa kuti afikire 3KA (1.2/50us & 8/20us), ndiye tsopano ndikupita ndi 1A ya mapangidwe enieni omwe akugwira ntchito pano, kaya atha kukwaniritsa kuchuluka kwapang'onopang'ono kwapang'onopang'ono?Zochitika zenizeni za polojekitiyi ndikutiuza kuti izi sizingatheke, ndiye tingachite bwino bwanji?Nayi njira yowerengera ma waya a PCB angagwiritsidwe ntchito ngati maziko onyamula nthawi yomweyo.

Mwachitsanzo: 0.36mm m'lifupi 1oz zamkuwa zojambulazo, makulidwe 35um mizere mu 40us amakona anayi makwerero panopa, pazipita inrush panopa pafupifupi 580A.Ngati mukufuna kupanga mapangidwe achitetezo a 5KA (8/20us), ndiye kutsogolo kwa waya wa PCB kuyenera kukhala wololera 2 oz zojambula zamkuwa 0.9mm m'lifupi.Zida zotetezera zingakhale zoyenera kumasula m'lifupi.

II.Samalani ndi masanjidwe a zigawo za madoko akuyenera kukhala malo otetezeka

Mapangidwe a doko la Surge kuphatikiza pamayendedwe athu anthawi zonse achitetezo amagetsi, tiyeneranso kuganizira zachitetezo cha mawotchi osakhalitsa.

Pamapangidwe amagetsi ogwiritsira ntchito nthawi zonse pakakhala malo otetezedwa, titha kunena za UL60950.Kuphatikiza apo, timatenga UL mu UL796 muyezo mu bolodi yosindikizidwa yamagetsi yopirira ndi 40V / mil kapena 1.6KV / mm.Chitsogozo cha data ichi pakati pa ma kondakitala a PCB chimatha kupirira malo otetezedwa a Hipot ndi chitetezo chothandiza kwambiri.

Mwachitsanzo, malinga ndi 60950-1 Table 5B, 500V ntchito voteji pakati kondakitala ayenera kukumana 1740Vrms kupirira voteji mayeso, ndi 1740Vrms pachimake ayenera 1740X1.414 = 2460V.Malinga ndi muyezo wa 40V/mil, mutha kuwerengera malo pakati pa ma conductor awiri a PCB sayenera kuchepera 2460/40 = 62mil kapena 1.6mm.

Ndipo ma surges kuwonjezera pa zinthu zomwe zili pamwambazi zomwe muyenera kuzidziwa, komanso tcherani khutu ku kukula kwa opaleshoni yomwe imagwiritsidwa ntchito, komanso mawonekedwe a chipangizo chotetezera kuti awonjezere malo otetezeka ku 1.6mm, kutsika kwakukulu kwa creepage ya 2460V. , ngati tiwonjezera mphamvu yamagetsi mpaka 6KV, kapena 12KV, ndiye ngati malo otetezekawa achuluke zimadalira mawonekedwe a chipangizo chotetezera kuwonjezereka kwa magetsi, chomwenso ndi Mainjiniya athu nthawi zambiri amakumana nawo poyesera pamene mawotchiwa amawombera mokweza.

Ceramic kumaliseche chubu Mwachitsanzo, mu lamulo la 1740V kupirira voteji, ife kusankha chipangizo ayenera kukhala 2200V, ndipo zili pa nkhani ya kuphulika pamwamba, kumaliseche ake spike voteji mpaka 4500V, pa nthawi ino, malinga ndi pamwamba. mawerengedwe, chitetezo katayanitsidwe wathu ndi: 4500/1600 * 1mm = 2.8125mm.

III.Samalani komwe kuli zida zachitetezo cha overvoltage mu PCB

Malo a chipangizo chotetezera makamaka amaikidwa kutsogolo kwa doko lotetezedwa, makamaka pamene doko liri ndi nthambi zambiri kapena dera, ngati litayikidwa modutsa kapena kumbuyo, ntchito yake yotetezera idzachepetsedwa kwambiri.Kunena zoona, ife nthawi zina chifukwa malo sikokwanira, kapena kwa aesthetics masanjidwe, nkhani zimenezi nthawi zambiri amaiwala.

IV.Samalani njira yayikulu yobwerera

Njira yayikulu yobwereranso pakali pano iyenera kukhala pafupi ndi magetsi kapena chipolopolo cha dziko lapansi, njira yayitali, yopingasa yobwereranso, kukula kwapanthawi kochepa komwe kumachitika chifukwa cha kukwera kwapansi, mphamvu ya voteji iyi pa tchipisi ambiri ndi zabwino, komanso wolakwa weniweni wa dongosolo Bwezerani, lockout.