Inductance chikamu chakakosha cheDC / DC magetsi. Pane zvinhu zvakawanda zvekufunga nezvazvo pakusarudza inductor, senge inductance kukosha, DCR, saizi, uye saturation ikozvino. Iwo saturation maitiro einductor anowanzo kusanzwisiswa uye anokonzera dambudziko. Iri bepa richakurukura kuti inductance inosvika sei pakuzara, kuti saturation inobata sei dunhu, uye nzira yekuona inductance saturation.
Inductance saturation inokonzera
Chekutanga, intuitively nzwisisa kuti inductance saturation chii, sezvinoratidzwa mumufananidzo 1:
Mufananidzo 1
Isu tinoziva kuti kana yazvino ichipfuura nepakati coil muMufananidzo 1, iyo coil inoburitsa magineti;
Iyo magineti musimboti ichave ine magnetized pasi pechiito cheiyo magineti, uye iyo yemukati magineti domains inotenderera zvishoma nezvishoma.
Kana iyo magnetic core yakanyatso magnetized, kutungamira kwemagnetic domain kwakangofanana nemagnetic field, kunyange kana kunze kwemagnetic field yakawedzerwa, iyo magnetic core haina magnetic domain inogona kutenderera, uye inductance inopinda munzvimbo yakazara. .
Kubva pane imwe nzvimbo yekuona, mune magnetization curve inoratidzwa muFigure 2, hukama pakati pemagineti flux density B nesimba remagineti H rinosangana neformula kurudyi muMufananidzo 2:
Kana iyo magnetic flux density inosvika kuBm, iyo magnetic flux density haichawedzera zvakanyanya nekuwedzera kweiyo magnetic field intensity, uye inductance inosvika pakuzara.
Kubva pahukama huri pakati pe inductance uye permeability µ, tinogona kuona:
Kana iyo inductance yazara, iyo µm ichaderedzwa zvakanyanya, uye pakupedzisira inductance ichaderedzwa zvakanyanya uye kugona kudzvinyirira ikozvino kucharasika.
Mufananidzo 2
Mazano ekusarudza inductance saturation
Pane here matipi ekutonga inductance saturation mumashandisirwo anoshanda?
Inogona kupfupikiswa muzvikamu zviviri zvikuru: theoretical calculation uye experimental test.
☆Iyo theoretical kuverenga inogona kutanga kubva kune yakanyanya magineti flux density uye yakanyanya inductance ikozvino.
☆Muedzo wekuyedza unonyanya kutarisa pane inductance ikozvino waveform uye dzimwe nzira dzekutanga dzekutonga.
Nzira idzi dzinotsanangurwa pasi apa.
Verenga iyo magnetic flux density
Iyi nzira yakakodzera kugadzira inductance uchishandisa magnetic core. Core parameters inosanganisira magineti redunhu kureba le, inoshanda nzvimbo Ae uye zvichingodaro. Rudzi rwemagineti musimboti unoteyawo giredhi inoenderana nemagineti, uye iyo magineti inoita zvimiro zvinoenderana pakurasikirwa kwemagineti musimboti uye saturation yemagineti flux density.
Nezvishandiso izvi, tinogona kuverenga iyo yakanyanya magineti flux density zvinoenderana neiyo chaiyo dhizaini mamiriro, sezvinotevera:
Mukuita, kuverenga kunogona kurerutswa, uchishandisa ui pachinzvimbo cheur; Chekupedzisira, tichienzaniswa nesaturation flux density yeiyo magineti, isu tinogona kutonga kana iyo yakagadzirwa inductance ine njodzi yekuzara.
Verenga iyo yakanyanya inductance ikozvino
Iyi nzira yakakodzera kugadzira dunhu zvakananga nekushandisa yakapera inductors.
Akasiyana edunhu topology ane mafomula akasiyana ekuverenga inductance ikozvino.
Tora Buck chip MP2145 semuenzaniso, inogona kuverengerwa zvinoenderana neinotevera fomula, uye yakaverengerwa mhedzisiro inogona kuenzaniswa neiyo inductance yakatarwa kukosha kuona kana iyo inductance ichazara.
Kutonga ne inductive ikozvino waveform
Iyi nzira zvakare ndiyo yakajairika uye inoshanda nzira muinjiniya maitiro.
Kutora MP2145 semuenzaniso, MPSmart simulation chishandiso chinoshandiswa kuenzanisa. Kubva pakuenzanisa waveform, zvinogona kuonekwa kuti kana inductor isati yazara, inductor ikozvino iine triangular wave ine imwe nzvimbo yakatsetseka. Kana iyo inductor yazara, iyo inductor ikozvino waveform ichava nekukanganisa kuri pachena, izvo zvinokonzerwa nekudzikira kweiyo inductance mushure mekuzara.
Mukuita zveinjiniya, isu tinogona kuona kana paine kukanganisa kweiyo inductance ikozvino waveform yakavakirwa pane izvi kutonga kana iyo inductance yakazara.
Pazasi pane yakayerwa waveform paMP2145 Demo board. Zvinogona kuonekwa kuti pane kukanganisa kwakajeka mushure mekuzadza, izvo zvinopindirana nemigumisiro yekufananidza.
Yera kana inductance yapisa zvisingaite uye teerera kuridza muridzo zvisina kujairika
Kune akawanda mamiriro muinjiniya kudzidzira, isu tingasaziva chaiyo yepakati mhando, zvakaoma kuziva iyo inductance saturation saizi yazvino, uye dzimwe nguva hazvina kunaka kuyedza inductance ikozvino; Panguva ino, isu tinokwanisa zvakare kutanga taziva kana saturation yakaitika nekuyera kana inductance ine tembiricha yakakwira, kana kuteerera kuti pane mhere isingaite.
Mazano mashoma ekusarudza inductance saturation akaunzwa pano. Ndinovimba yaibatsira.
Nguva yekutumira: Jul-07-2023
