Isibali Samanje se-PCB: Ububanzi Bokulandelela kanye Nezindlela Zokulinganisa ngeFomula ye-IPC-2221

Isibali samanje se-PCB siphendula umbuzo olula ngokukhohlisayo — “lo mkhondo kudingeka ube banzi kangakanani?” — sibe inombolo ongayiklama. Sinciphisa umkhondo wamandla bese sisebenza sishisa, sehlise i-voltage, futhi ekugcineni singahluleka; sikhulisa kakhulu yonke into bese uchitha isikhala sebhodi okungenzeka ungenaso. Lo mhlahlandlela uchaza izibalo ze-IPC-2221 ukuthi yonke i-calculator yamanje ye-PCB trace width isebenza ngaphansi kwe-hood, sibonisa isibonelo esiphelele esisebenzayo ongasiphinda ngesandla, futhi sandisa ukucabanga okufanayo kuma-via. Izibalo ezifanayo zingemuva kwawo wonke amathuluzi ahlobene — isibali samanje se-PCB trace, isibali samanje se-via, isibali samanje se-PCB nge-current — kanye nangemuva kombuzo wansuku zonke wokuthi ububanzi be-trace budinga ububanzi obungakanani.

Okulandelayo yindlela onjiniyela bethu be-DFM e-Highleap Electronics abahlola ngayo ubuqotho bethusi oluthwala ugesi ngaphambi kokuba ibhodi liqale ukwenziwa.

1. Lokho Okwenziwa Yi-PCB Current Calculator Futhi Kungani Kufanele Kulandelelwe Ububanzi Bendaba

Isibali samandla kagesi se-PCB sihlobanisa amanani amane: ugesi othwala umkhondo, indawo yawo yethusi enqamulayo, ukwenyuka kwezinga lokushisa okuveliswa ugesi, nokuthi ugesi usengqimbeni engaphandle noma engaphakathi. Lungisa noma yiziphi ezintathu bese isibali sixazulula okwesine. Emsebenzini abaklami basisebenzisa ngezindlela ezimbili - ukuthola ugesi ophephile kakhulu wogesi abawudonsile kakade, noma ukuthola ububanzi obuncane bogesi abadinga ukuwuletha.

I-physics ilula: ithusi linokumelana, ugesi ngokusebenzisa ukumelana ukhiqiza ukushisa (I²R), futhi lokho kushisa kuphakamisa izinga lokushisa lomshini kuze kube yilapho ufinyelela ukulingana nendawo okuzungezile. Umshini obanzi noma ojiyile unethusi eliningi, ukumelana okuphansi, kanye nendawo engaphezulu yokukhipha ukushisa, ngakho-ke uthwala ugesi omningi ekukhuphukeni okufanayo kokushisa.

Kungani lokhu kuyinkinga yokwethembeka

Umzila oshisiwe kakhulu awugcini nje ngokufudumala. Ukushisa okuphezulu okuqhubekayo kusheshisa i-oxidation yethusi, kwehlisa i-laminate eyizungezile, kuphakamisa ukumelana ngokwengeziwe ku-feedback loop elimazayo, futhi emabhodini kagesi kungaphakamisa ama-pad noma kuvule umzila ngokuphelele. Ukulinganisa kahle ithusi elithwala ugesi kungenye yezindlela zokutshala imali ezishibhile kakhulu ekwakhiweni.

Kungani ukwenyuka kwezinga lokushisa kuyisinqumo sokuklama

Akukho mandla kagesi “alinganiswe” okukodwa okunomkhondo — ugesi kuphela okhuphuka izinga lokushisa okwamukelekayo. Ukuphakama okungu-10°C kuyinto egcina imvelo futhi evamile; kusetshenziswa kakhulu u-20°C; ukuphakama okuphezulu kupakisha ugesi kagesi omningi ube yithusi elincane ngezindleko ze-margin. Ukukhetha i-ΔT evunyelwe kuyisinqumo sokuqala ngaphambi kokuba noma yisiphi isibali sinikeze impendulo enengqondo.

2. Ifomula ye-IPC-2221 Engemuva Kwayo Yonke I-Trace Width Calculator

Cishe yonke i-calculator yamanje ye-PCB eku-inthanethi isebenzisa i-equivation efanayo evela ku-IPC-2221, etholakala kuma-heating curves of real traces.

Nansi i -I kuma-ampere, i-ΔT iwukukhuphuka kwezinga lokushisa okuvunyelwe ngo-°C, kanti i-A iyindawo enqamulayo ye-trace kuma- square mils . I- k engaguquki ibamba izimo zokupholisa: ingu -0.048 yemikhondo yangaphandle, evezwa emoyeni futhi iphole kahle, kanye no -0.024 yemikhondo yangaphakathi, egqitshwe ku-laminate ngaphandle kokupholisa okuguquguqukayo.

Ukuguqula isisindo sethusi sibe ukujiya

Indawo enqamula ububanzi iphindwe ubukhulu, futhi ubukhulu buvela esisindweni sethusi. I-ounce eyodwa yethusi esakazeke phezu kwefithi lesikwele ingama- 1.37 mil (cishe ama-35 µm) ubukhulu. Ngakho-ke i-trace engu-1 oz enobubanzi obungama-50 mil ine-cross-section engu-50 × 1.37 = 68.5 mil². Ukuphinda kabili ithusi elingu-2 oz kuphinda kabili ubukhulu bube ngama-2.74 mil ngakho-ke kuphinda kabili indawo ngobubanzi obufanayo.

I-IPC-2221 uma iqhathaniswa ne-IPC-2152

I-IPC-2221 iyireferensi yakudala, elondolozayo futhi yilokho okusetshenziswa kakhulu ngababali abasheshayo. I -IPC-2152 entsha ibheka ezinye izici — ukujiya kwebhodi, ukuba khona kwezindiza zethusi, kanye nendawo eshisayo — futhi ngokuvamile ivumela ukulandelwa okuncane noma ukubikezela amazinga okushisa aphansi ngoba ikhombisa ukusabalala kokushisa ngendlela engokoqobo. Kumiklamo yamandla aqinile, i-IPC-2152 ifanele ukuqina okwengeziwe; ngosayizi wansuku zonke, i-IPC-2221 inikeza indawo yokuqala ephephile.

3. Indlela Yokubala Ububanzi Bokulandelela Isinyathelo Ngesinyathelo (Isibonelo Esisebenzayo)

Ukusebenza ifomula kanye ngesandla kwenza yonke imiphumela yokubala ibe sobala. Ake sithi udinga umkhondo wangaphandle ukuze uthwale ama-5 A anokuphakama okungu -10°C ebhodini elingu -1 oz.

Isinyathelo 1 — Hlela kabusha ifomula yendawo

Xazulula i-I = k × ΔT ^0.44 × A ^0.725 ku-A:

Isinyathelo 2 — Faka amanani

Nge-k = 0.048 (yangaphandle) kanye ne-ΔT = 10: ΔT ^0.44 = 10 ^0.44 ≈ 2.75. Ngakho-ke k × ΔT ^0.44 = 0.048 × 2.75 ≈ 0.132. Bese kuthi u-I ÷ 0.132 = 5 ÷ 0.132 ≈ 37.9.

Isinyathelo 3 — Isixazululo sendawo

Khuphula u-37.9 kumandla (1 ÷ 0.725 ≈ 1.379): A ≈ 37.9 ^1.379 ≈ 150 mil².

Isinyathelo 4 — Guqula indawo ibe ububanzi

Hlukanisa ngobukhulu obuyi-1 oz obuyi-1.37 mil: ububanzi = 150 ÷ ​​1.37 ≈ 110 mil (cishe amamilimitha angu-2.8). Lobo ububanzi obuncane bangaphandle be-5 A ekukhuphukeni okungu-10 °C.

Isinyathelo 5 — Hlola icala lesendlalelo sangaphakathi

Uma lowo mkhondo ofanayo ugijima kungqimba lwangaphakathi, u-k wehla uye ku-0.024 — ingxenye yenani. Ngenxa ye-exponent engu-0.725, ukuhlukaniswa kwe-k akugcini nje ngokuphindwe kabili indawo: kuyiphakamisa cishe ngo-2.6× (2 ^1.379 ). Ngakho-ke i-5 A efanayo ekukhuphukeni okungu-10 °C manje idinga cishe u-390 mil² , cishe ububanzi obungu-285 mil. Yingakho ukuhanjiswa kwamandla kugcinwa ezingqimbeni zangaphandle, noma kunikezwa ithusi elisindayo, lapho kufanele lingene ngaphakathi.

Lezi izinombolo ze-oda lokuqala; ukuphakamisa i-ΔT evunyelwe noma isisindo sethusi kunciphisa ububanzi ngokushesha, okuyiyona kanye indawo yokuhweba umshini wokubala okuvumela ukuthi uyihlole.

4. Ngokusebenzisa Amandla Amanje: Usayizi kanye Nokuthunga Ama-Vias

Imikhondo iyingxenye yendaba kuphela. Inethi yamandla ngokuvamile kufanele ishintshe izendlalelo, futhi indlela encane kakhulu iba yindawo eshisa kakhulu nevimbela kakhulu endleleni.

Indlela amandla amanje alinganiswa ngayo

I-plated via isebenza njengomkhondo omfushane, ogoqwe phezulu: amandla ayo amanje ancike engxenyeni yethusi yomgqomo wayo, ebekwe ububanzi bembobo eqediwe kanye nobukhulu be-plating. Indlela evamile yobunjiniyela ukuphatha umgqomo ogoqwe (umjikelezo we-plating uphindaphinda ubukhulu bawo) njengengxenye efanayo ye-trace bese usebenzisa ukucabanga okufanayo kwesitayela se-IPC, bese wengeza umkhawulo ngoba i-vias iphola kancane ngempumelelo kunethusi elingaphezulu.

Ukuthunga ama-vias ngokulingana

Esikhundleni sokuthembela ku-via eyodwa enkulu, abaklami baphatha ugesi ophezulu ngama -vias amaningi ngokulingana (“ngokuthunga”). Ama-vias amaningana abelana ngogesi, ehlisa ukumelana okuhlangene, futhi asakaze ukushisa, okuqine kakhulu kunembobo eyodwa. Umkhuba owusizo ukwenza isabelomali sogesi ogcinayo nge-via bese wengeza ama-vias anele ukumboza inethi ngomkhawulo.

Lapho i-Highleap ibuyekeza umklamo wamandla, siyaqinisekisa ukuthi ngokubala kanye nokubeka izinsimbi kusekela ugesi ogcwele — isizathu esifanayo sokuthunga esichazwe ngenhla — ukuthi izendlalelo zethusi esindayo ziyakhiqizwa, nokuthi i-stackup empeleni iletha ingxenye ehlanganisiwe eyayicatshangwa ukuthi i-calculator iyasebenza.

5. Amaphutha Okubala Amanje E-PCB Avamile kanye Nemikhuba Engcono

Ifomula ithembekile; okufakwayo yilapho imiklamo ingahambi kahle khona.

• Ukusebenzisa u-k wangaphandle ku-trace yangaphakathi. Ukukhohlwa ukushintsha kusuka ku-0.048 kuya ku-0.024 kulinganisa amandla angaphakathi cishe ngo-2×.
• Uma sicabanga ukuthi ithusi eliqediwe lilingana nethusi eliyisisekelo. Ukubeka iplati kwengeza ukujiya ezingqimbeni zangaphandle; izingqimba zangaphakathi zihlala ziseduze nobukhulu obujwayelekile. Sebenzisa ukujiya okuqediwe okungokoqobo.
• Ukunganaki ukushisa okuzungezile nokuseduze. I-ΔT iwukuphakama ngaphezu kwendawo ezungezile, okungenzeka ukuthi kakade iphakanyisiwe yizingxenye ezizungezile.
• Ukukhohlwa i-via kunethiwekhi yamandla eshintsha ungqimba. Umzila ofanele odla i-via encane umane uhambisa indawo eshisayo iye ku-via.
• Usayizi wamandla aqinile kuphela. Ama-inrush, amaphutha, kanye nama-pulse currents angadlula inani elizinzile futhi adinga ukuhlola kwawo noma isu lokuhlanganisa.
• Ukuphatha i-IPC-2221 ngendlela efanele. Isekelwe kushadi futhi isekelwe ku-conservative; ngemiklamo yamandla angaphansi, qinisekisa nge-IPC-2152 noma ukuhlolwa kokushisa.

Umkhuba ongcono ukunquma ukwenyuka kwezinga lokushisa okuvunyelwe kuqala, sebenzisa ukujiya okungokoqobo kwethusi eliqediwe, ugcine ugesi osindayo ezingqimbeni zangaphandle noma ucacise ugesi osindayo, ama-vias osayizi ngamabomu njengemikhondo, bese wengeza umkhawulo wogesi wesikhashana. Bese uqinisekisa ukuthi i-stackup ekhethiwe kanye nesisindo sethusi kungakhiwa ngempela nomkhiqizi wakho ngaphambi kokusebenzisa ukwakheka.

6. Lapho Izinombolo Zikhomba Kuthusi Olunzima

Ukubala kwamanje kuwusizo kuphela uma ibhodi lingakhiwa ukuze lifane nalo — futhi ngemiklamo yamandla angempela, impendulo enikezwa yifomula ivame ukudlula ithusi elijwayelekile elingu-1 oz. Ukuthwala amashumi ama-amps ngaphandle kokunyuka okukhulu kwezinga lokushisa ngokuvamile kusho ithusi elingu-2, 3, noma 6+ oz, isikhala esibanzi phakathi kwemigqa esindayo, kanye nezakhiwo ezifakwe ipulasitiki ukuze zifane. Lezo yizipharamitha zokwenziwa, ngakho-ke kufanelekile ukuziqinisekisa njengezingakhiwa ngaphambi kokuba ukwakheka kukhiywe.

I-Highleap ikhiqizwa ngamabhodi ajwayelekile angu-1 oz ngokusebenzisa ama-PCB ethusi elisindayo , futhi sizohlola ububanzi bakho bokulandelela, isisindo sethusi, kanye nokubalwa kwamandla okuthwala ugesi wangempela isakhiwo esingakunikeza — bese simaka lapho i-IPC-2152 ingakuvumela khona ukuthi uyiqinise. Thumela ugesi wakho, ithagethi yokwenyuka kwezinga lokushisa, kanye ne-stackup, futhi sizoqinisekisa ukuthi ithusi liyakhiqizwa.

Caphuna i-PCB yakho yamanje ephezulu

7. Imibuzo Ebuzwa Njalo

Iyiphi ifomula esetshenziswa yi-calculator yamanje ye-PCB?

Iningi lisebenzisa i-equation ye-IPC-2221 I = k × ΔT ^0.44 × A ^0.725 , lapho u-I ekhona khona kuma-amps, i-ΔT iwukukhuphuka kwezinga lokushisa okuvunyelwe ngo-°C, i-A iyindawo enqamulayo ku-mil², kanti i-k ingu-0.048 yemikhondo yangaphandle noma u-0.024 yemikhondo yangaphakathi. Izinga elisha le-IPC-2152 lilungisa lokhu ngebhodi kanye nezinto ezishisayo.

Kungani imikhondo yangaphakathi kudingeka ibe banzi kuneyangaphandle?

Izimpawu zangaphakathi zingcwatshwe ku-laminate ngaphandle kokupholisa umoya, ngakho-ke azikhiphi ukushisa kahle kakhulu. Kufomula ye-IPC-2221 i-k yabo engaguquki iyingxenye yezimpawu zangaphandle (0.024 vs 0.048) — futhi ngenxa ye-exponent engu-0.725, i-k ehlisiwe ifinyelela ekudingeni indawo enqamulayo izikhathi ezingaba ngu-2.6 ukuze kukhuphuke ugesi kanye nokushisa okufanayo.

Isisindo sethusi sithinta kanjani amandla amanje?

Isisindo sethusi sibeka ubukhulu bokulandelana — u-1 oz ungaba ngu-1.37 mil ubukhulu — futhi ubukhulu buphindaphinda ububanzi ukuze kunikezwe indawo enqamulayo. Ukuphinda kabili isisindo sethusi kusuka ku-1 oz kuya ku-2 oz kuphinda kabili indawo yobubanzi obufanayo, ngakho-ke umkhondo uthwala amandla amaningi kakhulu ekukhuphukeni okufanayo kwezinga lokushisa.

Yikuphi ukunyuka kwezinga lokushisa okufanele ngikuklamele?

Ukuphakama okungu-10°C kuyindlela ehlelekile nevamile futhi kusetshenziswa kakhulu ama-20°C. Inani elifanele lincike esilinganisweni sokushisa se-laminate yakho, i-ambient ngaphakathi kwe-enclosure, kanye nokuthi ufuna i-margin engakanani. Khumbula ukuthi ukuphakama kwengezwa phezu kwe-ambient yendawo, hhayi izinga lokushisa legumbi.

Ngingayilinganisa kanjani i-via ukuze ngithole amandla kagesi aphezulu?

Phatha ibhereli elifakwe uthango njenge-trace emfushane lapho ingxenye yalo yethusi incike khona kububanzi bembobo kanye nobukhulu be-plating, bese ufaka umkhawulo ngoba ama-via ayaphola kahle. Kumanethi kagesi angempela, sebenzisa ama-via amaningana ahambisanayo (ngokuthunga) ukuze abelane ngogesi futhi asakaze ukushisa kunokuthembela emgodini owodwa omkhulu.

Ingabe i-IPC-2221 noma i-IPC-2152 ingcono?

I-IPC-2221 ilula futhi iyalondoloza, okwenza kube yinto ezenzakalelayo ephephile yokulinganisa okusheshayo. I-IPC-2152 inembe kakhulu ngoba ibheka ubukhulu bebhodi, izindiza zethusi, kanye nendawo eshisayo, futhi ivame ukuvumela ukuthambekela okuncane. Kumiklamo eqinile noma enamandla amakhulu, ukuqinisekisa nge-IPC-2152 noma ukuhlolwa kokushisa kuyasiza.