Ubushobozi bufite uruhare runini mugushushanya byihuse PCB kandi ni ibikoresho bikoreshwa cyane kuri PCBS.Muri PCB, capacator zisanzwe zigabanijemo ubushobozi bwo kuyungurura, gukuramo imashini, kubika ingufu, nibindi.
1.Imbaraga zisohoka, ubushobozi bwo kuyungurura
Mubisanzwe twerekeza kuri capacitori yinjiza nibisohoka byumuzunguruko wa module module nkayunguruzo.Byumvikane byoroshye nuko capacitor itanga ituze ryinjiza nibisohoka amashanyarazi.Muri power module, filteri ya capacitor igomba kuba nini mbere ntoya.Nkuko bigaragara ku ishusho, filteri ya capacitor ishyirwa munini hanyuma ntoya mucyerekezo cyimyambi.
Mugihe cyo gutegura amashanyarazi, twakagombye kumenya ko uruhu rwumuringa numuringa ari binini bihagije kandi umubare wibyobo birahagije kugirango ubushobozi bwo gutembera bujuje ibisabwa.Ubugari n'umubare w'imyobo bisuzumwa bifatanije nubu.
Ubushobozi bwo kwinjiza ingufu
Imbaraga zinjiza capacitor ikora ikizunguruka kigezweho hamwe no guhinduranya.Ihindurwa ryubu riratandukanye na amplitude nini, Iout amplitude.Umuyoboro ni uguhindura inshuro.Mugihe cyo guhinduranya chip ya DCDC, ikigezweho cyakozwe niyi mpinduka ya none, harimo di / dt byihuse.
Muburyo bwa BUCK muburyo bumwe, inzira ikomeza inzira igomba kunyura muri GND pin ya chip, kandi capacitor yinjira igomba guhuzwa hagati ya GND na Vin ya chip, inzira rero irashobora kuba mugufi kandi ikabyimbye.
Ubuso bwiyi mpeta ni nto bihagije, nibyiza imirasire yo hanze yiyi mpeta izaba.
2.Gusohora ubushobozi
Imbaraga za pin yihuta ya IC ikenera ubushobozi bwa decoupling capacator, byaba byiza imwe kuri pin.Mu gishushanyo nyirizina, niba nta mwanya wa capacitor ya decoupling, irashobora gusibwa nkuko bikwiye.
Ubushobozi bwa decoupling capacitance ya IC itanga amashanyarazi mubisanzwe ni nto, nka 0.1μF, 0.01μF, nibindi. Ipaki ihuye nayo ni ntoya, nka pake 0402, paki 0603 nibindi.Mugihe ushizemo ubushobozi bwo gukuramo, ingingo zikurikira zigomba kwitonderwa.
(1) Shyira hafi hashoboka kuri pin itanga amashanyarazi, bitabaye ibyo ntishobora kugira ingaruka zo gukuramo.Mubyukuri, capacitor ifite radiyo imwe ikuramo, bityo ihame ryo kuba hafi rigomba gushyirwa mubikorwa.
.Intego yo kubyimba ni ukugabanya inductance no kuyobora amashanyarazi.
.Isasu naryo rigomba kuba ryinshi, kandi umwobo ugomba kuba munini bishoboka.Niba umwobo ufite aperture ya 10mil urashobora gukoreshwa, umwobo wa 8mil ntugomba gukoreshwa.
(4) Menya neza ko decoupling loop ari nto ishoboka
3.Ubushobozi bwo kubika ingufu
Uruhare rwububiko bwingufu ni ukureba ko IC ishobora gutanga ingufu mugihe gito mugihe ukoresheje amashanyarazi.Ubushobozi bwa capacitori yo kubika ingufu muri rusange ni nini, kandi pake ijyanye nayo nini.Muri PCB, ubushobozi bwo kubika ingufu zirashobora kuba kure yigikoresho, ariko ntibube kure cyane, nkuko bigaragara ku ishusho.Uburyo busanzwe bwo kubika ingufu za capacitor fan-umwobo irerekanwa mumashusho.
Amahame yumwobo ninsinga naya akurikira:
(1) Icyerekezo ni kigufi kandi kibyimbye gishoboka, kuburyo habaho inductance ntoya ya parasitike.
(2) Kubushobozi bwo kubika ingufu, cyangwa ibikoresho bifite ubunini burenze urugero, gukubita ibyobo byinshi bishoboka.
(3) Birumvikana, imikorere myiza yamashanyarazi yumwobo wumufana ni umwobo wa disiki.Ukuri gukeneye gusuzumwa neza