Inductance wani muhimmin bangare ne na samar da wutar lantarki na DC/DC. Akwai abubuwa da yawa da za a yi la'akari da lokacin zabar inductor, kamar ƙimar inductance, DCR, girma, da jikewar halin yanzu. Sau da yawa ana rashin fahimtar halayen jikewa na inductor kuma suna haifar da matsala. Wannan takarda za ta tattauna yadda inductance ya kai ga saturation, yadda jikewa ke shafar kewaye, da kuma hanyar gano saturation na inductance.
Inductance jikewa dalilai
Na farko, da hankali ku fahimci menene saturation na inductance, kamar yadda aka nuna a hoto 1:
Hoto 1
Mun san cewa lokacin da aka wuce ta hanyar wuta a cikin hoto na 1, na'urar za ta haifar da filin maganadisu;
Mai maganadisu za a yi maganadisu a ƙarƙashin aikin filin maganadisu, kuma yankunan maganadisu na ciki za su juya a hankali.
Lokacin da Magnetic core gaba ɗaya magnetized, alkiblar yankin maganadisu duk iri ɗaya ne da filin maganadisu, ko da filin maganadisu na waje ya ƙaru, magnetic core ba shi da wani yanki na maganadisu da zai iya juyawa, kuma inductance yana shiga cikin yanayin da ya dace. .
Daga wani ra'ayi, a cikin ma'aunin maganadisu da aka nuna a hoto na 2, alakar da ke tsakanin ma'aunin maganadisu B da ƙarfin filin maganadisu H ya hadu da dabarar da ke hannun dama a cikin Hoto 2:
Lokacin da ƙarfin maganadisu ya kai Bm, ƙarfin maganadisu ya daina ƙaruwa sosai tare da haɓakar ƙarfin filin maganadisu, kuma inductance ya kai ga saturation.
Daga dangantakar dake tsakanin inductance da permeability µ, zamu iya gani:
Lokacin da inductance ya cika, µm zai ragu sosai, kuma a ƙarshe inductance zai ragu sosai kuma ikon danne halin yanzu zai ɓace.
Hoto 2
Tips don ƙayyade jikewar inductance
Shin akwai wasu shawarwari don yin hukunci game da jikewar inductance a aikace-aikace masu amfani?
Ana iya taƙaita shi zuwa manyan nau'i biyu: lissafi na ka'idar da gwaji.
☆Ƙididdigar ƙa'idar na iya farawa daga matsakaicin ƙarfin juzu'in maganadisu da matsakaicin halin yanzu inductance.
☆Gwajin gwaji ya fi mayar da hankali ne akan tsarin inductance na yanzu da kuma wasu hanyoyin yanke hukunci na farko.
An bayyana waɗannan hanyoyin a ƙasa.
Yi ƙididdige yawan motsin maganadisu
Wannan hanya ta dace da zayyana inductance ta amfani da magnetic core. Mahimman sigogi sun haɗa da tsayin da'irar maganadisu le, yanki mai tasiri Ae da sauransu. Nau'in siginar maganadisu shima yana ƙayyade madaidaicin matakin abu na maganadisu, kuma kayan maganadisu suna yin tanadi masu dacewa akan asarar ma'aunin maganadisu da saturation magnetic flux density.
Tare da waɗannan kayan, za mu iya ƙididdige matsakaicin matsakaicin ƙarfin maganadisu bisa ga ainihin yanayin ƙira, kamar haka:
A aikace, ana iya sauƙaƙe lissafin, ta amfani da ui maimakon ur; A ƙarshe, idan aka kwatanta da jikewar juzu'i na kayan maganadisu, za mu iya yin hukunci ko ƙirƙira inductance yana da haɗarin jikewa.
Yi ƙididdige iyakar inductance na yanzu
Wannan hanya ta dace da zayyana da'ira kai tsaye ta amfani da ƙãre inductor.
Daban-daban na da'ira topologies suna da daban-daban dabaru don kirga inductance halin yanzu.
Ɗauki Buck guntu MP2145 a matsayin misali, ana iya ƙididdige shi bisa ga tsari mai zuwa, kuma ana iya kwatanta sakamakon da aka ƙididdige shi da ƙimar ƙayyadaddun inductance don sanin ko za a cika inductance.
Yin hukunci ta hanyar inductive halin yanzu kalaman kalaman
Wannan hanya kuma ita ce hanya mafi dacewa kuma mafi dacewa a aikin injiniya.
Ɗaukar MP2145 a matsayin misali, ana amfani da kayan aikin kwaikwayo na MPSmart don kwaikwayo. Daga simulation waveform, ana iya ganin cewa lokacin da inductor bai cika ba, inductor current shine kalaman triangular tare da wani gangare. Lokacin da inductor ya cika, tsarin motsi na inductor na yanzu zai sami murdiya a bayyane, wanda ke faruwa ta hanyar raguwar inductance bayan jikewa.
A cikin aikin injiniya, za mu iya lura ko akwai murdiya na inductance na halin yanzu waveform bisa wannan don yin hukunci ko inductance ya cika.
A ƙasa akwai ma'aunin igiyar igiyar ruwa akan allon MP2145 Demo. Ana iya ganin cewa akwai bayyananniyar murdiya bayan jikewa, wanda ya yi daidai da sakamakon kwaikwayo.
Auna ko inductance ɗin yana da zafi sosai kuma sauraron busawa mara kyau
Akwai yanayi da yawa a cikin aikin injiniya, ƙila ba mu san ainihin ainihin nau'in ba, yana da wahala a san girman saturation na inductance na yanzu, kuma wani lokacin bai dace ba don gwada halin yanzu inductance; A wannan lokacin, za mu iya tun farko sanin ko jikewa ya faru ta hanyar auna ko inductance yana da yanayin zafi mara kyau, ko sauraron ko akwai kururuwa mara kyau.
An gabatar da ƴan nasihu don tantance saturation na inductance anan. Ina fatan ya taimaka.
Lokacin aikawa: Jul-07-2023
