Chifukwa Chiyani Ndikufunika "0 Ohm Resistor"?

The 0 Ohm resistor ndi chotsutsa chapadera chomwe chiyenera kugwiritsidwa ntchito pazinthu zingapo.Chifukwa chake, tili m'kati mwa mapangidwe ozungulira kapena omwe nthawi zambiri amagwiritsidwa ntchito ngati chopinga chapadera.0 ohm resistors amadziwikanso kuti jumper resistors, ndi cholinga chapadera resistors, 0 ohm resistors kukana mtengo si zero kwenikweni (ndiko superconductor youma zinthu), chifukwa pali kukana mtengo, komanso ndi ochiritsira chip resistors ali ndi cholakwika chomwecho. kulondola kwa chizindikiro ichi.Opanga resistor ali ndi milingo itatu yolondola ya 0-ohm chip resistors, monga momwe tawonetsera pa Chithunzi 29.1, omwe ndi F-file (≤ 10mΩ), G-file (≤ 20mΩ), ndi J-file (≤ 50mΩ).Mwa kuyankhula kwina, mtengo wotsutsa wa 0-ohm resistor ndi wocheperapo kapena wofanana ndi 50 mΩ.ndi chifukwa cha chikhalidwe chapadera cha 0-ohm resistor kuti mtengo wake wotsutsa ndi wolondola umalembedwa mwapadera.chidziwitso cha chipangizo cha 0-ohm resistor chimalembedwa ndi magawo awa, monga momwe tawonetsera pachithunzichi.

Nthawi zambiri timawona 0 ohm resistors m'mabwalo, ndipo kwa novices, nthawi zambiri zimakhala zosokoneza: ngati ndi 0 ohm resistor, ndi waya, chifukwa chiyani muyike?Ndipo kodi choletsa choterechi chilipo pamsika?

1. Ntchito ya 1.0 ohm resistors

M'malo mwake, 0 ohm resistor ikadali yothandiza.Pali mwina angapo ntchito motere.

a.Kugwiritsidwa ntchito ngati waya wodumphira.Izi ndizosangalatsa komanso zosavuta kuziyika.Ndiko kuti, tikamaliza chigawo pamapangidwe omaliza, akhoza kuchotsedwa kapena kufupikitsidwa, pomwe 0-ohm resistor imagwiritsidwa ntchito ngati jumper.Pochita izi, ndizotheka kupewa kusintha kwa PCB.Kapena ife gulu ladera, tingafunike kupanga mapangidwe ogwirizana, timagwiritsa ntchito 0 ohm resistors kuti tikwaniritse kuthekera kwa njira ziwiri zolumikizira dera.

b.M'mabwalo osakanikirana monga digito ndi analogue, nthawi zambiri zimafunika kuti zifukwa ziwirizi zikhale zosiyana ndikugwirizanitsa pa mfundo imodzi.M'malo molumikiza zifukwa ziwirizo mwachindunji, titha kugwiritsa ntchito 0 ohm resistor kuti tigwirizane ndi zifukwa ziwirizi.Ubwino wa izi ndikuti nthaka imagawanika kukhala maukonde awiri, zomwe zimapangitsa kuti zikhale zosavuta kuzigwiritsa ntchito poyika mkuwa pamadera akuluakulu, ndi zina zotero. Ndipo tikhoza kusankha ngati tifupikitsa ndege ziwiri zapansi kapena ayi.Monga cholembera cham'mbali, zochitika zoterezi nthawi zina zimalumikizidwa ndi ma inductors kapena maginito mikanda etc.

c.Za fuse.Chifukwa cha kuphatikizika kwakukulu kwa mayanidwe a PCB, zimakhala zovuta kuphatikizira pakadutsa nthawi yayitali ndi zolakwika zina, zomwe zingayambitse ngozi zazikulu.Monga 0 ohm resistor panopa kupirira mphamvu ndi yofooka (kwenikweni, 0 ohm resistor ndi kukana kwina, pang'ono chabe), overcurrent adzakhala choyamba 0 ohm resistor anasakaniza, motero kuswa dera, kuteteza ngozi yaikulu.Nthawi zina ma resistors ang'onoang'ono okhala ndi kukana kwa zero kapena ma ohm ochepa amagwiritsidwanso ntchito ngati fuse.Komabe, izi sizovomerezeka, koma opanga ena amagwiritsa ntchito izi kuti asunge ndalama.Izi sizowopsa ndipo sizigwiritsidwa ntchito motere.

d.Malo osungidwira ntchito.Mutha kusankha kuyiyika kapena ayi, kapena mfundo zina, monga zikufunikira.Nthawi zina imayikidwanso chizindikiro ndi * kusonyeza kuti ili ndi vuto.

e.Amagwiritsidwa ntchito ngati dera lokonzekera.Izi zimagwiranso ntchito ngati jumper kapena dipswitch, koma zimakhazikika ndi soldering, motero kupewa kusinthidwa mwachisawawa kwa kasinthidwe ndi wogwiritsa ntchito wamba.Poika zotsutsa m'malo osiyanasiyana, ndizotheka kusintha ntchito ya dera kapena kukhazikitsa adiresi.Mwachitsanzo, nambala yamitundu yama board ena imapezedwa ndi milingo yayikulu komanso yotsika, ndipo titha kusankha 0 ohms kuti tigwiritse ntchito kusintha kwamitundu yayikulu komanso yotsika yamitundu yosiyanasiyana.

2. Mphamvu ya 0 Ohm Resistors

Mafotokozedwe a 0 Ohm resistors nthawi zambiri amagawidwa ndi mphamvu, monga 1/8W, 1/4W, ndi zina zotero. Gome limatchula kuthekera kwamakono kofanana ndi mapaketi osiyanasiyana a 0-ohm resistors.

0 Ohm Resistor Kuthekera Kwamakono ndi Phukusi

3. Single point earth for analog and digital ground

Malingana ngati ali maziko, ayenera kulumikizidwa pamodzi kenako ndi dziko lapansi.Ngati sichikugwirizanitsidwa palimodzi ndi "malo oyandama", pali kusiyana kwapakati, kosavuta kusonkhanitsa ndalama, zomwe zimapangitsa magetsi osasunthika.Ground ndi kuthekera kwa 0, ma voltages onse amachokera kumalo ofotokozera, muyezo wapansi uyenera kukhala wofanana, kotero kuti mitundu yonse ya nthaka iyenera kukhala yayifupi yolumikizidwa palimodzi.Amakhulupirira kuti dziko lapansi limatha kutengera zinthu zonse, limakhalabe lokhazikika ndipo ndilo malo omaliza a dziko lapansi.Ngakhale matabwa ena sali olumikizidwa ndi dziko lapansi, malo opangira magetsi amagwirizanitsidwa ndi dziko lapansi ndipo mphamvu yochokera ku bolodi pamapeto pake imabwerera ku malo opangira magetsi padziko lapansi.Kulumikiza maziko a analogi ndi digito mwachindunji kwa wina ndi mnzake kudera lalikulu kungayambitse kusokonezana.Osati kugwirizana yochepa ndipo si koyenera, chifukwa monga pamwambapa, tingagwiritse ntchito njira zinayi zotsatirazi kuthetsa vutoli.

a.Kulumikizidwa ndi mikanda ya maginito: Dongosolo lofanana la mikanda ya maginito ndi lofanana ndi choletsa kukana kwa gulu, lomwe limangokhala ndi vuto lalikulu pamaphokoso pamtundu wina wa ma frequency, ndipo limafunikira kuyerekeza kwanthawi yayitali kwa phokoso likagwiritsidwa ntchito kuti sankhani chitsanzo choyenera.Pazochitika zomwe nthawi zambiri zimakhala zosatsimikizika kapena zosayembekezereka, mikanda ya maginito sikwanira.

b.Wolumikizidwa ndi capacitor: capacitor wolekanitsidwa kudzera mu AC, zomwe zimapangitsa malo oyandama, sangathe kukwaniritsa mphamvu zofanana.

c.Kulumikizana ndi ma inductors: ma inductors ndi akulu, ali ndi magawo ambiri osokera ndipo ndi osakhazikika.

d.0 ohm resistor kugwirizana: impedance imatha kulamulidwa osiyanasiyana, impedance ndiyotsika mokwanira, sipadzakhalanso resonance frequency point ndi mavuto ena.

4. 0 Ohm resistor bwanji derating?

0 Ohm resistors nthawi zambiri amangodziwika ndi ovotera pakali pano, komanso kukana kwakukulu.Mafotokozedwe ochepetsa nthawi zambiri amakhala otsutsa wamba, ndipo safotokozanso momwe angachotsere 0 ohm resistors padera.Titha kugwiritsa ntchito Lamulo la Ohm kuwerengera kukana kwakukulu komwe kumachulukitsidwa ndi kuchuluka kwa 0 Ohm resistor, mwachitsanzo, ngati pakali pano ndi 1A ndipo kukana kwakukulu ndi 50mΩ, ndiye timawona kuti mphamvu yayikulu yololedwa kukhala 50mV.Komabe, ndizovuta kwambiri kuyesa voteji yeniyeni ya 0 Ohm muzochitika zogwiritsira ntchito, chifukwa voteji ndi yaying'ono kwambiri, ndipo chifukwa imagwiritsidwa ntchito pofupikitsa, ndipo kusiyana kwamagetsi pakati pa malekezero awiri afupikitsa kusinthasintha.

Chifukwa chake, nthawi zambiri timafewetsa njirayi pogwiritsa ntchito kutsitsa kwachindunji kwa 50% ya zomwe zidavotera kuti zigwiritsidwe ntchito.Mwachitsanzo, timagwiritsa ntchito choletsa kulumikiza ndege ziwiri zamagetsi, magetsi ndi 1A, ndiye timayerekeza kuti magetsi onse ndi GND ndi 1A, malinga ndi njira yosavuta yochepetsera yomwe tafotokozazi, sankhani 2A. 0 ohm resistor pakufupikitsa.