Mafi girman mitar sauyawar na'urar, haka nan ƙaramar ƙarar sa take. Shin hakan yana nufin babu iyaka ta sama ga mitar sauyawa? To, shin ƙarar za ta iya zama ƙarami sosai?
Amsar ita ce mara kyau. A cikin ainihin aikin, ana ƙayyade mitar na'urorin canza wutar lantarki masu yawan mita ta hanyoyi da yawa kuma ana iya raba su zuwa fannoni da dama:
1, Tsarin da'ira na flyback topology: Masu canza wutar lantarki suna da ayyukan adana makamashi da canzawa, tare da mitar aiki da aka saba amfani da ita na 40-100kHz. Lokacin da mitar ta ƙasa da 40kHz, girman tsakiyar ƙarfe ya yi yawa, wanda ke haifar da ƙarar wutar lantarki mai yawa; Lokacin da mitar ta wuce 100kHz, ƙaruwar ƙarfin lantarki da ke faruwa sakamakon fitar da wutar lantarki na iya lalata transistor ɗin canzawa.
Tsarin gaba: Matsakaicin kewayon da aka saba amfani da shi shine 60-150kHz, amma yana buƙatar daidaita asarar magnetic core da asarar switch. Tsarin tura ja/rabin gada/full gada: Tsarin maganadisu mai jure wa juyawa mai tsari biyu, ingantaccen aiki, yana tallafawa mitoci masu girma daga ɗaruruwan kHz zuwa MHz, amma yana buƙatar ƙirar sarrafawa mai rikitarwa da watsa zafi.
2、Halayen kayan magnetic core sun haɗa da asarar magnetic hysteresis da asarar eddy current. A cikin wani takamaiman kewayon, asarar magnetic core yana ƙaruwa tare da ƙaruwar mita. Saboda haka, kayan magnetic core daban-daban ya kamata su sami kewayon amfani da mita daban-daban don tabbatar da ƙarancin asarar magnetic core. Misali, manganese zinc ferrite ya dace da amfani a mita daga 10 zuwa 300kHz, yayin da nickel zinc ferrite ya dace da amfani a mita sama da 1MHz.
Na biyu, yayin da mitar ke ƙaruwa, ana buƙatar rage matsakaicin ƙarfin maganadisu don guje wa cikar jijiyar maganadisu. Misali, ƙarfin maganadisu na DMR40 shine 0.38T, kuma lokacin da ake tsara shi a mita 100KHz, yawanci muna ɗaukar ƙimar kusan 0.2T.
3, Saurin sauya na'urar wutar lantarki MOS transistor na na'urorin unipolar ne, tare da lokacin kunnawa a cikin nanoseconds. Mitar aiki ta ka'ida na iya kaiwa MHz, kuma ainihin matsakaicin mitar aiki shine ɗaruruwan KHz. IGBT na na'urorin bipolar ne, tare da lokaci mai tsawo na kashewa da matsakaicin mitar aiki yawanci tsakanin 40 ~ 50KHz.
4、 Ƙaruwar inganci da yawan watsawar zafi yana haifar da ƙaruwar asarar maɓalli da tuƙi, wanda ke haifar da raguwar inganci gaba ɗaya da ƙaruwar samar da zafi. Domin tabbatar da cewa zafin samfurin yana cikin matsakaicin da aka saba, muna buƙatar ƙarin matakai don magance watsawar zafi.
5、 A manyan mitoci, farashin yana ƙaruwa saboda ƙaruwar asarar maɓallan wuta, wanda ke buƙatar ƙarin matakai don magance zubar zafi, wanda ke haifar da ƙaruwar farashi. Na biyu, capacitors da inductors galibi suna fuskantar raguwar aiki a manyan mitoci, kuma muna buƙatar zaɓar na'urori waɗanda suka dace da manyan mitoci, wanda ke ƙara farashi. A cikin ƙira mai amfani, farashi yana da iyaka, wanda sau da yawa yana ƙayyade iyakar saman mitoci na aiki.
6, Halayen guntu: Kwamfutocin sarrafawa na PWM galibi suna da buƙatun iyaka na sama don amsawa ga daidaitawar nauyi mai canzawa. Wannan kuma yana ƙayyade cewa mitar sauyawa na na'urar canzawa tana cikin wani takamaiman kewayon.
Lokacin Saƙo: Agusta-06-2025
