Kungani Ngidinga I-“0 Ohm Resistor”?

I-resistor engu-0 Ohm iyi-resistor ekhethekile okufanele isetshenziselwe inani lezinhlelo zokusebenza.Ngakho-ke, empeleni sisenqubweni yokuklama isifunda noma sivame ukusetshenziselwa ukuphikiswa okukhethekile.Ama-resistors angu-0 ohm ayaziwa nangokuthi ama-jumper resistors, iyinjongo ekhethekile yokumelana ne-resistors, i-0 ohm resistors resistors value ayiyona i-zero ngempela (lokho kuyizinto ezomile ze-superconductor), ngoba kukhona inani lokumelana, kodwa futhi nama-chip resistors avamile anephutha elifanayo. ukunemba kwalesi sikhombi.Abakhiqizi be-Resistor banamazinga amathathu okunemba we-0-ohm chip resistors, njengoba kukhonjisiwe kuMfanekiso 29.1, okuyifayela le-F (≤ 10mΩ), i-G-file (≤ 20mΩ), ne-J-file (≤ 50mΩ).Ngamanye amazwi, inani lokumelana le-0-ohm resistor lingaphansi noma lilingana no-50 mΩ.kungenxa yemvelo ekhethekile ye-resistor engu-0-ohm ukuthi inani layo lokumelana nokunemba limakwa ngendlela ekhethekile.ulwazi lwedivayisi ye-resistor engu-0-ohm imakwe ngale mingcele, njengoba kuboniswe emfanekisweni.

Sivame ukubona ama-resistor angu-0 ohm kumasekhethi, futhi kuma-novices, kuvame ukudideka: uma kuyi-resistor engu-0 ohm, kuyintambo, ngakho kungani ukuyibeka?Futhi ingabe i-resistor enjalo iyatholakala emakethe?

1. Umsebenzi we-1.0 ohm resistors

Eqinisweni, i-resistor engu-0 ohm isasetshenziswa.Kukhona cishe imisebenzi eminingana kanje.

a.Izosetshenziswa njengocingo lwe-jumper.Lokhu kokubili kujabulisa ngobuhle futhi kulula ukukufaka.Okusho ukuthi, lapho siqedela isifunda ekwakhiweni kokugcina, kungase kunqanyulwe noma kufinyezwe, lapho i-resistor engu-0-ohm isetshenziswa njenge-jumper.Ngokwenza lokhu, kungenzeka ugweme ushintsho lwe-PCB.Noma thina ibhodi lesifunda, kungase kudingeke senze umklamo ohambisanayo, sisebenzisa ama-resistors angu-0 ohm ukufeza ukuthi kungenzeka izindlela ezimbili zokuxhuma kwesifunda.

b.Eziyingini ezixubile ezifana nedijithali ne-analogue, kuvame ukudingeka ukuthi izizathu ezimbili zihlukaniswe futhi zixhunywe endaweni eyodwa.Esikhundleni sokuxhumanisa lezi zizathu ezimbili ndawonye, ​​​​singasebenzisa i-resistor engu-0 ohm ukuxhuma lezi zizathu ezimbili.Inzuzo yalokhu ukuthi umhlabathi uhlukaniswa ube amanethiwekhi amabili, okwenza kube lula kakhulu ukuphatha lapho ubeka ithusi phezu kwezindawo ezinkulu, njll. Futhi singakhetha ukuthi sifinyeze izindiza ezimbili zomhlabathi noma cha.Njengenothi eseceleni, izikhathi ezinjalo kwesinye isikhathi zixhunywa nama-inductors noma ubuhlalu obukazibuthe njll.

c.Okwamafuse.Ngenxa ye-fusing current ephezulu yokuqondanisa kwe-PCB, kunzima ukuhlanganisa uma kwenzeka kuba ne-short-circuit overcurrent namanye amaphutha, okungase kuholele ezingozini ezinkulu.Njengoba umthamo wamanje we-resistor ongu-0 ohm ubuthakathaka uma kuqhathaniswa (eqinisweni, i-0 ohm resistor iphinde ibe nokumelana okuthile, kuncane kakhulu), i-overcurrent izoqale ihlanganiswe ngu-0 ohm resistor, ngaleyo ndlela iphule isekethe, ivimbele ingozi enkulu.Kwesinye isikhathi ama-resistors amancane anokumelana ne-zero noma ama-ohm ambalwa nawo asetshenziswa njengamafuse.Nokho, lokhu akunconywa, kodwa abanye abakhiqizi basebenzisa lokhu ukuze bonge izindleko.Lokhu akukona ukusetshenziswa okuphephile futhi akuvamile ukusetshenziswa ngale ndlela.

d.Indawo ebekelwe ukugunyazwa.Unganquma ukuthi uyayifaka noma cha, noma amanye amanani, njengoba kudingeka.Kwesinye isikhathi ibuye imakwe ngo-* ukukhombisa ukuthi incike ekulungiseni iphutha.

e.Isetshenziswa njengesekhethi yokucushwa.Lokhu kusebenza ngendlela efanayo ne-jumper noma i-dipswitch, kodwa kulungiswa ngokusoda, ngaleyo ndlela kugwema ukuguqulwa okungahleliwe kokucushwa ngumsebenzisi ojwayelekile.Ngokufaka ama-resistors ezindaweni ezahlukene, kungenzeka ukushintsha umsebenzi wesifunda noma usethe ikheli.Isibonelo, inombolo yenguqulo yamanye amabhodi itholwa ngamaleveli aphezulu naphansi, futhi singakhetha u-0 ohms ukuze senze ushintsho lwamazinga aphezulu naphansi ezinguqulo ezihlukahlukene.

2. Amandla angu-0 Ohm Resistors

Ukucaciswa kwezimbangi ezingu-0 Ohm ngokuvamile kuhlukaniswa ngamandla, afana no-1/8W, 1/4W, njll. Ithebula libonisa amandla akhona manje ahambisana namaphakheji ahlukene angu-0-ohm resistors.

0 Ohm Resistor Amandla amanje ngephakheji

3. Iphuzu elilodwa lomhlaba le-analogue nedijithali

Uma nje ziyizisekelo, kufanele ekugcineni zixhunywe ndawonye bese zihlanganiswa nomhlaba.Uma kungaxhunywanga ndawonye “kuyindawo entantayo”, kunomehluko wengcindezi, kulula ukunqwabelanisa ukushaja, okuholela kugesi omile.I-Ground inamandla okubhekisela angu-0, wonke ama-voltages athathwe endaweni eyinkomba, izinga eliphansi kufanele lilingane, ngakho zonke izinhlobo zomhlabathi kufanele zibe mfushane zixhunywe ndawonye.Kukholakala ukuthi umhlaba uyakwazi ukumunca wonke amashaji, uhlale uzinzile futhi uyindawo yokugcina yenkomba yomhlaba.Nakuba amanye amabhodi engaxhunywanga emhlabeni, isitshalo samandla sixhunywe emhlabeni futhi amandla avela ebhodini agcina ebuyela endaweni yamandla emhlabeni.Ukuxhumanisa isisekelo se-analogue nedijithali ngqo kwenye indawo endaweni enkulu kungaholela ekuphazamisekeni okufanayo.Hhayi uxhumano iDemo futhi akufaneleki, isizathu njengoba ngenhla, singasebenzisa izindlela ezine ezilandelayo ukuxazulula le nkinga.

a.Ixhunywe nobuhlalu kazibuthe: Isifunda esilinganayo sobuhlalu obuzibuthe silingana nesinqamuleli sokumelana nebhande, esinomthelela obalulekile wokucindezela umsindo endaweni ethile, futhi sidinga ukulinganisa kwangaphambili kwefrikhwensi yomsindo lapho sisetshenziswa ukuze khetha imodeli efanele.Ezimweni lapho imvamisa ingaqinisekile noma ingabikezeleki, ubuhlalu obuzibuthe abulingani.

b.Ixhunywe yi-capacitor: i-capacitor ehlukaniswe nge-AC, okuholela emhlabathini ontantayo, ayikwazi ukufeza umphumela wamandla alinganayo.

c.Ukuxhumana nama-inductors: ama-inductors makhulu, anemingcele eminingi elahlekile futhi awazinzile.

d.Ukuxhumeka kwe-0 ohm resistor: i-impedance ingalawulwa ububanzi, i-impedance iphansi ngokwanele, ngeke kube khona iphuzu lemvamisa ye-resonance nezinye izinkinga.

4. 0 Ohm resistor kanjani derating?

0 Ohm resistors ngokuvamile amakwe kuphela ukalwe esiphezulu samanje, kanye esiphezulu ukumelana.Ukucaciswa kokuncishiswa kuvame ukungokwabaphikisi abajwayelekile, futhi akuvamisile ukuchaza ukuthi zingancishiswa kanjani izimbangi ezingu-0 ohm ngokuhlukana.Singasebenzisa Umthetho ka-Ohm ukubala ukumelana okuphezulu okuphindaphindwe amandla amanje alinganiselwe we-resistor engu-0 Ohm, isibonelo, uma isilinganiso samanje singu-1A futhi ukumelana okuphezulu kungu-50mΩ, khona-ke sicabangela i-voltage ephezulu evunyelwe ukuthi ibe ngu-50mV.Kodwa-ke, kunzima kakhulu ukuhlola i-voltage yangempela ye-0 Ohm ezimweni zokusetshenziswa okungokoqobo, ngoba i-voltage incane kakhulu, futhi ngenxa yokuthi ngokuvamile isetshenziselwa ukunqamulela, futhi umehluko we-voltage phakathi kwamaphethelo amabili we-short uyashintshashintsha.

Ngakho-ke, ngokuvamile senza le nqubo ibe lula ngokusebenzisa ukwehla okuqondile okungu-50% kwamandla amanje alinganiselwe ukuze asetshenziswe.Isibonelo, sisebenzisa i-resistor ukuxhuma izindiza ezimbili zamandla, amandla kagesi yi-1A, bese silinganisa ukuthi amandla akhona kokubili ukunikezwa kwamandla kanye ne-GND ngu-1A, ngokuhambisana nendlela elula yokunciphisa esisanda kuyichaza, khetha i-2A. 0 ohm resistor for shorting.