Imodi Yokuqhuba Eqhubekayo ku-SMPS

Ekwakheni nasekusebenzeni kwe-Switched-Mode Power Supplies (SMPS), umqondo owodwa obalulekile othonya ngokuqondile ukusebenza, ukuzinza, nokusebenza kahle kokunikezwa kwamandla imodi yokuqhuba. Ukuqonda imodi ye-continuous conduction (CCM) uma iqhathaniswa ne-discontinuous conduction mode (DCM) kubalulekile, njengoba lezi zindlela zinomthelela omkhulu ekwakhiweni nasekuhlelekeni kwamasekhethi e-elekthronikhi, ikakhulukazi uma ehlanganiswe kuma-PCB. Nakhu ukuthi kungani i-CCM ibalulekile, ukuthi iyithinta kanjani imiklamo yakho, kanye nezinyathelo ezihilelekile ekuyifezeni.

Iyini i-Continuous Conduction Mode?

Imodi ye-continuous conduction (CCM) yisimo ekushintsheni kukagesi lapho i-current inductor ingalokothi yehlele kuqanda phakathi nomjikelezo wokushintshwa. Lena imodi yokusebenza ekhethwayo ngoba ihlinzeka ngokudluliswa kwamandla okushelelayo futhi inciphisa umsindo nokuzwakala kokuphumayo. Ngokuphambene, kumodi ye-discontinuous conduction (DCM), i-inductor yamanje iwela kuqanda phakathi kwemijikelezo, okungaholela ekuziphatheni okuyinkimbinkimbi kakhulu ngokomthetho we-voltage nomsindo.

Ku-SMPS, imodi yokuqhuba ithinta kokubili ukulethwa kwamandla kanye nohlobo lwezingxenye ozikhethayo, kanye nesakhiwo se-PCB sisonke. Ukuziphatha kwamanje phakathi nemijikelezo yokushintsha kubalulekile endleleni ophatha ngayo ubuqotho besignali, unciphise umsindo, futhi uqinisekise ukuguqulwa kwamandla okuphumelelayo.

Kungani Imodi Yokuqhuba Eqhubekayo Ibalulekile?

Ngaphezu kokuhlinzeka nge-voltage ephumayo ezinzile, i-CCM inikeza izinzuzo ezimbalwa ezibalulekile ezithuthukisa ukusebenza okuphelele kwezinhlelo zokuguqula amandla. Lezi zinzuzo zikwenza kube ukukhetha okukhangayo kwezinhlelo zokusebenza eziningi, ikakhulukazi lezo ezidinga ukunemba, ukwethembeka, nokusebenza kahle. Ukuqonda ukubaluleka kwe-CCM kusiza onjiniyela bathuthukise imiklamo yokulawula okungcono, umsindo ophansi, kanye nokusebenza kahle okwandisiwe, okubalulekile ezinhlelweni zesimanje zikagesi.

I-Voltage Ephumayo Ezinzile:
Kwa-CCM, amandla kagesi okukhiphayo alawulwa ngokuyinhloko umjikelezo we-pulse-width modulation (PWM), ohlinzeka ngokulawula okukhulu nokuzinza. Lokhu kwenza kube lula ukuphatha i-voltage ephumayo ngisho nalapho i-voltage yokufaka ishintshashintsha noma ihluka ngokwemibandela yomthwalo. Ukugeleza kwamanje okungaguquki kusiza ekugcineni umphumela obikezelwayo, othembekile, oqinisekisa ukuzinza kokusebenza ngaphansi kwezimo zokusebenza ezihlukahlukene.

Umsindo Owehlisiwe kanye ne-EMI:
Ukusebenza ku-CCM kunciphisa kakhulu umsindo nokuphazanyiswa kukagesi (EMI) uma kuqhathaniswa ne-Discontinuous Conduction Mode (DCM). Njengoba i-inductor yamanje ingehli ifike kuqanda ku-CCM, i-waveform yamanje ihlala ishelela, isusa izinguquko ezibukhali ezivamile ze-DCM. Lokhu kubangela i-EMI encane futhi kwenza isistimu ifaneleke kakhulu izinhlelo zokusebenza ezibucayi lapho ukunciphisa umsindo kubalulekile.

Ukusebenza Okuthuthukisiwe:
I-CCM ithuthukisa ukusebenza kahle kwamandla ngokuqinisekisa ukuthi i-inductor idlulisela amandla ngokuqhubekayo phakathi kwezigaba zokufaka nokukhiphayo. Ngokungafani ne-DCM, lapho amandla agcinwa khona bese ekhishwa, i-CCM inciphisa ukulahlekelwa phakathi nale nqubo, okuholela ekuguqulweni kwamandla okusebenza kahle kakhulu. Lokhu kuzuzisa kakhulu ezinhlelweni ezidinga ukusebenza okuphezulu okuqhubekayo, ukunciphisa ukumosheka kwamandla kanye nokuchithwa kokushisa.

Ukulawula Okwenziwa Lula:
Ku-CCM, ukugeleza okuqhubekayo kwamanje kwenza idizayini ye-loop yokulawula ibe lula. Ngaphandle kokuphazamiseka kwamanje, ukulawula imvamisa yokushintsha kanye nomjikelezo womsebenzi kuba lula kakhulu. Lokhu lula kuhumusha kusistimu ezinzile, lapho ukulawulwa kulula ukuphatha, futhi ukunikezwa kwamandla kungakwazi ukuzivumelanisa ngokushesha nezimo ezihlukene ngaphandle kokulungiswa okuyinkimbinkimbi.

Imodi Yokuqhuba Eqhubekayo vs. Imodi Yokuqhuba Engaqhubeki: Umthelela Kumklamo we-PCB

Uma uklama i-Switched-Mode Power Supply (SMPS), ukuqonda ukuthi ngabe isekethe izosebenza ku-Continuous Conduction Mode (CCM) noma ku-Discontinuous Conduction Mode (DCM) kubalulekile, njengoba ithonya hhayi kuphela ukusebenza kodwa futhi nokwakheka kwe-PCB kanye nokukhethwa kwezingxenye. Imodi ngayinye iletha izinselelo zayo kanye nezidingo zomklamo we-PCB ophumelelayo, ikakhulukazi maqondana nokuphathwa kwamandla, ukulawula umsindo, kanye nokuphathwa kwe-ripple.

Imodi Yokuqhuba Eqhubekayo (CCM)

E-CCM, i-inductor yamanje ayilokothi yehlele kuqanda ngesikhathi somjikelezo wokushintshwa. Amanje ageleza ngokuqhubekayo, okusho ukuthi ukudluliswa kwamandla phakathi kwezigaba zokufaka nokukhiphayo kuhlala kungashintshi. Le modi ikhethwa emiklamo lapho ukulawulwa kwe-voltage okunembile, i-ripple ephansi, kanye nokuphazamiseka okuphansi kwe-electromagnetic (EMI) kubalulekile.

Umthelela ku-PCB Design:

• Umzila Wamandla Osebenzayo: Njengoba okwamanje kuqhubeka, PCB imikhondo kudingeka yakhelwe ukusingatha high current nokulahlekelwa okuncane. Abaklami kufanele basebenzise imikhondo ebanzi noma izendlalelo zethusi ezijiyile ukuze banciphise ukumelana nokuqinisekisa ukulethwa kwamandla okuphumelelayo, ukuvimbela ukwehla kwamandla kagesi okungase kuthinte ukusebenza.
• I-EMI encishisiwe: Njengoba i-inductor yamanje ihlala ishelela ku-CCM, i-waveform igwema izinguquko ezibukhali ezivame ukubangela i-EMI. Ngemiklamo ephansi ye-EMI, abaklami be-PCB bangagxila kumasu okumisa phansi nokuvikela, besebenzisa izindiza eziqinile zaphansi kanye nokubeka ingxenye efanele ukuze kuqinisekiswe ukusebenza okungenamsindo.
• Ukuphathwa Okushisayo: Ukugeleza kwamanje okuqhubekayo kuholela ekulahlekeni kwamandla okungaguquki. Idizayini esebenzayo yokushisa iba yinto ebalulekile, ngokuvamile idinga osinki bokushisa, ama-thermal vias, kanye nezingxenye ezinesilinganiso esiphakeme ukuze kulawule ukushisa okukhiqizwa ngokusebenza okuqhubekayo.

I-Discontinuous Conduction Mode (DCM)

Ku-DCM, i-inductor yamanje iwela kuqanda phakathi nengxenye yomjikelezo wokushintsha. Le modi ivamile ezinhlelweni zamandla aphansi noma lapho umthwalo ulula. Nakuba i-DCM inganikeza izinzuzo ezithile mayelana nokusebenza okulula kwemithwalo elula, yethula i-ripple eyengeziwe kanye ne-EMI ngenxa yezinguquko ezibukhali zamanje.

Umthelela ku-PCB Design:

• Idizayini Yesakhiwo Esiyinkimbinkimbi: Imvelo eguquguqukayo yamanje ku-DCM idinga isakhiwo se-PCB esivumelana nezimo. Usayizi we-inductor, ukubekwa kwe-capacitor, nobubanzi bokulandelela kufanele kukhethwe ngokucophelela ukuze kusingathwe iziqongo nezigodi zamanje ngaphandle kokubangela ukungazinzi noma ukulahlekelwa okukhulu.
• Kukhushulwe i-Ripple ne-EMI: Njengoba ukwehla kwamanje kuye kuqanda, amasekhethi e-DCM angathola ukugeleza okukhulu kanye ne-EMI ngenxa yoshintsho olusheshayo lwamanje. Ukuze ulawule lokhu, ama-capacitor ekhwalithi ephezulu kanye nesisekelo esiqinile se-PCB kubalulekile. Ukwengeza, amasu okuvikela kanye nezindiza zaphansi ezivimbela kancane kufanele zithuthukiswe ukuze kuncishiswe umsindo.
• Ukukhetha Ingxenye: Ku-DCM, ukukhetha kwengxenye, ikakhulukazi ama-inductors nama-capacitor, kudlala indima ebalulekile. Ama-inductors kufanele akhethwe ukuze asingathe izimfuno zamanje ezahlukahlukene, kuyilapho ama-capacitor kufanele abe nosayizi omkhulu ngokwanele ukuze acindezele ukugeleza ngokuphumelelayo. Amathuluzi okulingisa afana ne-SPICE angasiza ekunqumeni amanani afanelekile alezi zingxenye ukuze agweme ukungena ku-CCM lapho kungahlosiwe.

Isinqumo phakathi kwe-CCM ne-DCM asithinti nje ukusebenza kahle nokusebenza kwe-SMPS yakho kodwa futhi nesu lokuklama le-PCB. I-CCM ngokuvamile ikhethwa ezinhlelweni ezidinga ukulawulwa kwamandla kagesi okunembayo, umsindo ophansi, nokusebenza kahle okuthuthukisiwe, kuyilapho i-DCM ivame ukutholakala kumadizayini anamandla aphansi, alayisha ukukhanya abekezelela ukugeleza okuphezulu kanye ne-EMI. Ukuqonda imodi ezosebenza ngayo umklamo wakho kukuvumela ukuthi uthuthukise isakhiwo sakho se-PCB, ukhethe izingxenye ezifanele, futhi usebenzise amasu omsindo asebenza kahle kakhulu namasu okuphatha okushisayo ukuze uzuze ukusebenza okungcono kakhulu.

Uma lesi sidingo sithinta ukutholakala noma ukukhishwa komkhiqizo, siqhathanise nokuhlanganiswa kwe-BGA PCB kanye nokubuyekezwa kwe-PCB prototype ngaphambi kokuthumela amafayela okugcina ukuze abuyekezwe.

Ukucatshangelwa Komklamo Wokuzuza Imodi Yokuqhuba Eqhubekayo

Ukudizayina i-SMPS esebenza kumodi yokuqhuba eqhubekayo, kufanele ukhethe ngokucophelela izingxenye bese uklama isakhiwo. Nazi izinto ezibalulekile ezinomthelela ekusebenzeni kwe-CCM:

• • Ukukhetha Inductor: I-inductor idlala indima ebalulekile ekunqumeni indlela yokuqhuba. Inani le-inductance lidinga ukuphakama ngokwanele ukuze livimbele okwamanje ukuthi lehle liye kuziro. Ngokuvamile, i-inductor enkulu izodambisa ama-ripples amanje, esiza ukugcina ukuqhutshwa okuqhubekayo.
  • Ukukhethwa kwe-Capacitor: Ama-Capacitor kusekethe yokuphakelwa kwamandla asetshenziselwa ukushelela ukushintshashintsha kwamandla kagesi kanye nokugcina amandla. I-capacitor ekhiphayo enkulu ngokwanele iyadingeka ukuze kuvinjwe i-ripple eyeqile futhi uqinisekise ukuthi yamanje awehli ibe ziro phakathi kwemijikelezo. Inani lamandla okukhiphayo kufanele likhethwe ngokucophelela ukulinganisa ukucindezelwa kwe-ripple futhi kuqinisekiswe ukuthi umklamo uhlala ku-CCM.
  • Layisha Ukumelana: Ukumelana nomthwalo kuthinta ngqo imodi yokusebenza. Uma umthwalo ulula kakhulu, isistimu ingase ingene ku-DCM. Ngokulungisa ukumelana nomthwalo, ungaqinisekisa ukuthi i-inductor yamanje ihlala ingaphezu kweqanda kuwo wonke umjikelezo wokushintsha.
  • Amapharamitha we-PWM: Imvamisa yokushintsha kanye nomjikelezo womsebenzi nawo ubalulekile ekusebenzeni kwe-CCM. Ukushuna kahle kwesiginali ye-PWM kungasiza ekuqinisekiseni ukuthi i-inductor yamanje ihlala iqhubekayo. Ukukhetha imvamisa yokushintsha efanele kanye nomjikelezo womsebenzi kubalulekile ukuze kuzuzwe kokubili ukusebenza okuzinzile nokusebenza kahle kwamandla.
  • Ukulingisa kanye Nokumodela: Ukusebenzisa amathuluzi okulingisa afana ne-SPICE kungasiza ukuqinisekisa ukuthi idizayini yakho izosebenza e-CCM. Lawa mathuluzi akuvumela ukuthi wenze imodeli ye-inductor yamanje, i-voltage ripple, namanye amapharamitha abalulekile ukuze uqinisekise ukuthi i-SMPS izohlangabezana nezinhloso zakho zokusebenza.

Isiphetho

Ukuzuza imodi yokuqhuba eqhubekayo kumiklamo ye-SMPS kubalulekile ekusebenzeni okuthuthukisiwe, ukulawulwa okungcono kwamandla kagesi, kanye nomsindo oncishisiwe kanye ne-EMI. Ukukhetha okulungile kwe-inductor, i-capacitor, namapharamitha e-PWM, kuhlanganiswe nedizayini ye-PCB ecophelelayo, kuzosiza ukuqinisekisa ukuthi isistimu yakho isebenza ku-CCM, inikeze ukusebenza okungcono kakhulu kwezinhlelo zokusebenza zobuchwepheshe obuphezulu.

Kwa-Highleap Electronic, sisebenza ngokukhethekile ekukhiqizeni nasekuhlanganiseni i-PCB, sinikeza izixazululo ezingochwepheshe zemiklamo yokuphakelwa kukagesi, okuhlanganisa i-SMPS enemodi yokuqhuba eqhubekayo. Amakhono ethu okukhiqiza athuthukile aqinisekisa ukuthi amandla akho asebenza kahle asebenza kahle, anokwethenjelwa, futhi alungele ukusetshenziswa kwe-elekthronikhi okudingekayo. Ake sikusize udizayine futhi wakhe amandla aphelele wesistimu yakho, ngokunemba kanye nekhwalithi efunwa yiphrojekthi yakho.