I-inductance iyingxenye ebalulekile yokuphakelwa kukagesi kwe-DC/DC. Kunezici eziningi okufanele zicatshangelwe lapho ukhetha i-inductor, njengevelu ye-inductance, i-DCR, usayizi, kanye ne-saturation current. Izici zokugcwaliswa kwesikhala kwama-inductors ngokuvamile aziqondwa kahle futhi zidala inkinga. Leli phepha lizoxoxa ngokuthi i-inductance ifinyelela kanjani ekugcwalisweni, ukuthi ukugcwaliswa kwe-saturation kuyithinta kanjani isekethe, kanye nendlela yokuthola ukugcwala kwe-inductance.
Izimbangela zokugcwala kwe-inductance
Okokuqala, qonda ngokunembile ukuthi iyini i-inductance saturation, njengoba kuboniswe kuMfanekiso 1:
Umfanekiso 1
Siyazi ukuthi uma i-current idluliswa kukhoyili kuMfanekiso 1, ikhoyili izokhiqiza insimu kazibuthe;
Isizinda kazibuthe sizokwenziwa uzibuthe ngaphansi kwesenzo senkundla kazibuthe, futhi izizinda kazibuthe zangaphakathi zizojikeleza kancane.
Lapho isizinda kazibuthe sinozibuthe ngokuphelele, isiqondiso sesizinda kazibuthe sifana nenkundla kazibuthe, ngisho noma inkambu kazibuthe yangaphandle iyanda, inkaba kazibuthe ayinayo isizinda kazibuthe esingajikeleza, futhi inductance ingena esimweni esigcwele. .
Ngokomunye umbono, kwijika kazibuthe eliboniswe kuMfanekiso 2, ubudlelwano phakathi kokuminyana kazibuthe B namandla kazibuthe H kuhlangana nefomula engakwesokudla kuMfanekiso 2:
Lapho ukuminyana kukazibuthe kufinyelela ku-Bm, ukuminyana kazibuthe akusakhuphuki kakhulu ngokwanda kwamandla kazibuthe, futhi inductance ifinyelela ekugcwaliseni.
Kusuka kubudlelwano phakathi kwe-inductance kanye nokungena µ, singabona:
Uma i-inductance isigcwele, i-µm izoncishiswa kakhulu, futhi ekugcineni i-inductance izoncishiswa kakhulu futhi ikhono lokucindezela lamanje lizolahleka.
Umfanekiso 2
Amathiphu okunquma ukugcwaliswa kwesikhala kwe-inductance
Ingabe akhona amathiphu okwahlulela ukugcwala kwe-inductance kuzinhlelo zokusebenza ezingokoqobo?
Ingafingqwa ngezigaba ezimbili eziyinhloko: ukubala kwethiyori nokuhlola kokuhlola.
☆Isibalo setiyori singaqala kusukela kubukhulu obukhulu be-magnetic flux density kanye nenani elikhulu lamanje le-inductance.
☆Ukuhlolwa kokuhlola kugxile kakhulu ku-waveform yamanje ye-inductance kanye nezinye izindlela zokwahlulela zokuqala.
Lezi zindlela zichazwe ngezansi.
Bala ukuminyana okuguquguqukayo kazibuthe
Le ndlela ilungele ukuklama inductance usebenzisa i-magnetic core. Amapharamitha angukhiye ahlanganisa ubude besifunda kazibuthe, indawo esebenzayo i-Ae nokunye. Uhlobo lukazibuthe core futhi lunquma ibanga elihambisanayo lezinto kazibuthe, futhi okokusebenza kazibuthe kwenza izinhlinzeko ezihambisanayo ekulahlekeni kwengqikithi kazibuthe kanye nokugcwala kwe-flux kazibuthe.
Ngalezi zinsiza, singakwazi ukubala ubukhulu obukhulu be-magnetic flux density ngokuya ngesimo sangempela sokuklama, ngale ndlela elandelayo:
Empeleni, ukubala kungenziwa lula, kusetshenziswa i-ui esikhundleni se-ur; Okokugcina, uma kuqhathaniswa nokuminyana kwe-saturation flux yezinto ezizibuthe, singahlulela ukuthi i-inductance eklanyelwe inengozi yokugcwala kwesikhala.
Bala ubukhulu be-inductance current
Le ndlela ifaneleka ukuklama isifunda ngokuqondile ngokusebenzisa ama-inductors aphelile.
Ama-topology esekethe ahlukene anamafomula ahlukene okubala i-inductance current.
Thatha i-Buck chip MP2145 njengesibonelo, ingabalwa ngokuya ngefomula elandelayo, futhi umphumela obaliwe ungaqhathaniswa nenani lokucaciswa kwe-inductance ukuze kunqunywe ukuthi i-inductance izogcwala.
Ukwahlulela nge-inductive current waveform
Le ndlela futhi iyindlela evamile futhi esebenzayo ekusebenzeni kobunjiniyela.
Uma sithatha i-MP2145 njengesibonelo, ithuluzi lokulingisa le-MPSmart lisetshenziselwa ukulingisa. Kusukela ku-waveform yokulingisa, kungabonakala ukuthi uma i-inductor ingagcwali, i-inductor yamanje iyigagasi elingunxantathu elinethambeka elithile. Lapho i-inductor igcwele, i-waveform yamanje ye-inductor izoba nokuhlanekezela okusobala, okubangelwa ukwehla kwe-inductance ngemva kokugcwaliswa kwesikhala.
Emsebenzini wobunjiniyela, singabheka ukuthi ingabe kukhona ukuhlanekezelwa kwe-waveform yamanje ye-inductance ngokusekelwe kulokhu ukuze sahlulele ukuthi i-inductance igcwele yini.
Ngezansi i-waveform elinganiselwe ebhodini leDemo le-MP2145. Kungabonakala ukuthi kukhona ukuhlanekezela okusobala ngemva kokugcwaliswa kwe-saturation, okuhambisana nemiphumela yokulingisa.
Linganisa ukuthi ingabe i-inductance ishisa ngendlela engavamile futhi ulalele ukushaywa kwekhwela okungavamile
Kunezimo eziningi ekusebenzeni kobunjiniyela, singase singalwazi uhlobo oluqondile oluyisisekelo, kunzima ukwazi usayizi wamanje we-inductance saturation, futhi ngezinye izikhathi akulula ukuhlola i-inductance current; Ngalesi sikhathi, singaphinda sinqume kusengaphambili ukuthi ukugcwaliswa kwesikhala kwenzekile ngokukala ukuthi i-inductance inokunyuka kwezinga lokushisa okungavamile, noma silalele ukuthi kukhona yini ukumemeza okungavamile.
Amathiphu ambalwa okunquma ukugcwala kwe-inductance kwethulwe lapha. Ngethemba ukuthi bekuwusizo.
Isikhathi sokuthumela: Jul-07-2023
