Zaɓin na'urar MOSFET don yin la'akari da duk abubuwan abubuwan, daga ƙarami zuwa zaɓi nau'in N-nau'in ko nau'in P, nau'in fakiti, babba zuwa wutar lantarki ta MOSFET, kan juriya, da sauransu, buƙatun aikace-aikacen daban-daban sun bambanta.Labari mai zuwa yana taƙaita zaɓin na'urar MOSFET na manyan dokoki 3, na yi imani cewa bayan karantawa za ku sami babban aiki.
1. Power MOSFET zaɓi mataki na daya: P-tube, ko N-tube?
Akwai nau'ikan MOSFET na wutar lantarki guda biyu: N-channel da P-channel, a cikin tsarin ƙirar tsarin don zaɓar N-tube ko P-tube, zuwa ainihin aikace-aikacen musamman don zaɓar, N-channel MOSFETs don zaɓar samfurin, maras tsada;MOSFETs P-tashar don zaɓar ƙirar ƙasa da tsada.
Idan ƙarfin lantarki a haɗin S-pole na wutar lantarki MOSFET ba shine tushen tsarin tsarin ba, tashar N-tashar tana buƙatar tashar wutar lantarki ta ƙasa mai iyo, injin mai canzawa ko bootstrap drive, hadaddun kewayawa;P-tashar za a iya tura kai tsaye, tuƙi mai sauƙi.
Bukatar yin la'akari da aikace-aikacen N-channel da P-tashar sune galibi
a.Kwamfutar littafin rubutu, kwamfutoci da sabar da aka yi amfani da su don ba da CPU da fan mai sanyaya tsarin, tsarin ciyar da firinta na motsa jiki, injin tsabtace iska, masu tsabtace iska, magoya bayan wutar lantarki da sauran kayan aikin gida na injin sarrafa injin, waɗannan tsarin suna amfani da tsarin da'ira mai cikakken gada, kowane gada hannu. A kan tube na iya amfani da P-tube, kuma za a iya amfani da N-tube.
b.Tsarin sadarwa 48V tsarin shigarwa na hot-tologin MOSFET da aka sanya a babban ƙarshen, zaka iya amfani da P-tubes, zaka iya amfani da N-tubes.
c.Littafin rubutu kwamfuta shigar da'irar a cikin jerin, wasa da anti-reverse dangane da loading sauya biyu-da-baya ikon MOSFETs, da amfani da N-tashar bukatar sarrafa guntu na ciki hadedde drive cajin famfo, da amfani da P-tashar. ana iya tukawa kai tsaye.
2. Zaɓin nau'in kunshin
Nau'in tashar tashar MOSFET mai ƙarfi don ƙayyade mataki na biyu don ƙayyade fakitin, ka'idodin zaɓin kunshin sune.
a.Hawan zafin jiki da ƙirar zafi shine mafi mahimmancin buƙatun don zaɓar kunshin
Daban-daban nau'ikan nau'ikan nau'ikan nau'ikan suna da juriya na thermal daban-daban da tarwatsewar wutar lantarki, ban da la'akari da yanayin thermal na tsarin da yanayin yanayin yanayi, kamar ko akwai sanyaya iska, yanayin yanayin zafi da ƙuntatawa girman, ko yanayin yana rufe da sauran dalilai. Babban ka'idar ita ce tabbatar da haɓakar zafin wutar lantarki na MOSFET da ingantaccen tsarin, jigon zaɓin sigogi da kunshin ƙarin iko na MOSFET.
Wani lokaci saboda wasu yanayi, buƙatar yin amfani da MOSFET da yawa a layi daya don magance matsalar ɓarkewar zafi, kamar a aikace-aikacen PFC, masu kula da motocin lantarki, tsarin sadarwa, kamar tsarin samar da wutar lantarki na biyu aikace-aikacen gyaran gyare-gyare na synchronous, an zaɓi a cikin a layi daya tare da mahara bututu.
Idan ba za a iya amfani da haɗin haɗin kai-tube da yawa ba, ban da zaɓar MOSFET mai ƙarfi tare da mafi kyawun aiki, ƙari kuma, ana iya amfani da fakiti mafi girma ko sabon nau'in fakitin, alal misali, a cikin wasu kayan wuta na AC / DC TO220 canza zuwa kunshin TO247;a wasu hanyoyin samar da wutar lantarki, ana amfani da sabon kunshin DFN8*8.
b.Ƙayyadaddun girman tsarin
Wasu tsarin lantarki suna iyakance ta girman PCB da tsayin ciki, kamar tsarin samar da wutar lantarki na tsarin sadarwa saboda tsayin ƙuntatawa yawanci suna amfani da kunshin DFN5 * 6, DFN3 * 3;a wasu ACDC samar da wutar lantarki, da yin amfani da matsananci-bakin ciki zane ko saboda gazawar harsashi, taro TO220 kunshin ikon MOSFET fil kai tsaye a cikin tushen, tsawo na ƙuntatawa ba zai iya amfani da TO247 kunshin.
Wasu ƙira-ƙira-ƙasa-ƙasa kai tsaye suna lanƙwasa fil ɗin na'urar lebur, wannan tsarin samar da ƙira zai zama mai rikitarwa.
A cikin ƙira babban allon kariyar baturi na lithium, saboda ƙaƙƙarfan ƙaƙƙarfan ƙuntatawa, yawancin yanzu suna amfani da kunshin CSP matakin guntu don haɓaka aikin zafi gwargwadon iyawa, tare da tabbatar da mafi ƙarancin girma.
c.Kula da farashi
Farkon tsarin lantarki da yawa ta amfani da fakitin plug-in, waɗannan shekarun saboda karuwar farashin aiki, kamfanoni da yawa sun fara canzawa zuwa kunshin SMD, kodayake farashin walda na SMD fiye da toshewa mai girma, amma babban matakin sarrafa kansa na walda SMD, Gabaɗaya farashin har yanzu ana iya sarrafa shi cikin madaidaicin kewayo.A wasu aikace-aikace irin su motherboards na tebur da allo waɗanda ke da tsada sosai, ana amfani da wutar lantarki MOSFET a cikin fakitin DPAK saboda ƙarancin farashi na wannan fakitin.
Sabili da haka, a cikin zaɓin kunshin MOSFET mai ƙarfi, don haɗa salon nasu kamfani da samfuran samfuran, la'akari da abubuwan da ke sama.
3. Zaɓi juriya akan Jiha RDSON, lura: ba halin yanzu ba
Sau da yawa injiniyoyi suna damuwa game da RDSON, saboda RDSON da asarar tafiyarwa suna da alaƙa kai tsaye, ƙarami RDSON, ƙaramar asarar wutar lantarki MOSFET, mafi girman inganci, haɓakar zafin jiki.
Hakazalika, injiniyoyi kamar yadda zai yiwu don bin aikin da ya gabata ko abubuwan da suka kasance a cikin ɗakin karatu na kayan aiki, don RDSON na hanyar zaɓi na ainihi ba shi da yawa don la'akari.Lokacin da zafin zafin wutar da aka zaɓa MOSFET yayi ƙasa da ƙasa, saboda dalilai masu tsada, zai canza zuwa manyan abubuwan RDSON;lokacin da hauhawar zafin wutar lantarki MOSFET ya yi yawa, tsarin tsarin ya yi ƙasa kaɗan, zai canza zuwa RDSON ƙananan abubuwan da aka gyara, ko ta haɓaka da'irar fitar da waje, inganta hanyar daidaita yanayin zafi, da sauransu.
Idan sabon aiki ne, babu wani aikin baya da za a bi, to yadda ake zabar wutar lantarki MOSFET RDSON?Ga hanyar da za a gabatar muku: Hanyar rarraba wutar lantarki.
Lokacin zayyana tsarin samar da wutar lantarki, yanayin da aka sani sune: kewayon shigarwar ƙarfin lantarki, ƙarfin fitarwa / fitarwa na yanzu, inganci, mitar aiki, ƙarfin lantarki, ba shakka, akwai sauran alamun fasaha da MOSFETs masu ƙarfi waɗanda suka danganci waɗannan sigogi.Matakai sune kamar haka.
a.Dangane da kewayon ƙarfin shigarwa, ƙarfin fitarwa / fitarwa na yanzu, inganci, ƙididdige matsakaicin asarar tsarin.
b.Rashin wutar lantarki mai ban mamaki, asarar abubuwan da ba na wutar lantarki ba, asarar IC a tsaye da asarar tuƙi, don yin ƙima mai ƙima, ƙimar ƙima na iya yin lissafin 10% zuwa 15% na jimlar asara.
Idan da'irar wutar lantarki tana da resistor na samfur na yanzu, ƙididdige yawan ƙarfin wutar lantarki na abin da ake kira resistor na yanzu.Jimlar asara ban da waɗannan asarar da ke sama, ragowar ɓangaren ita ce na'urar wuta, taranfoma ko asarar wutar lantarki.
Ragowar asarar wutar lantarki za a keɓe ga na'urar wutar lantarki da taranfoma ko inductor a wani kaso, kuma idan ba ku da tabbas, matsakaicin rarraba ta adadin abubuwan da aka gyara, ta yadda za ku sami asarar wutar lantarki ta kowace MOSFET.
c.Rashin wutar lantarki na MOSFET an keɓe shi ga asarar sauyawa da asarar gudanarwa a cikin wani yanki, kuma idan ba a tabbatar ba, asarar sauyawa da asarar gudanarwa ana kasafta su daidai.
d.Ta hanyar hasarar tafiyar MOSFET da RMS na yanzu, ƙididdige matsakaicin juriya da aka yarda da shi, wannan juriya shine MOSFET a matsakaicin madaidaicin madaidaicin zafin aiki RDSON.
Takardar bayanai a cikin wutar lantarki MOSFET RDSON da aka yi alama tare da ƙayyadaddun yanayin gwaji, a cikin ma'auni daban-daban suna da ƙima daban-daban, gwajin zafin jiki: TJ = 25 ℃, RDSON yana da ingantaccen yanayin zafin jiki, don haka bisa ga mafi girman zazzabi junction na MOSFET da Ƙimar zafin RDSON, daga ƙimar ƙididdige RDSON na sama, don samun daidaitaccen RDSON a zafin jiki na 25 ℃.
e.RDSON daga 25 ℃ don zaɓar nau'in ikon MOSFET da ya dace, bisa ga ainihin sigogin MOSFET RDSON, ƙasa ko sama datsa.
Ta hanyar matakan da ke sama, zaɓi na farko na ƙirar MOSFET mai ƙarfi da sigogin RDSON.
An cire wannan labarin daga hanyar sadarwar, da fatan za a tuntube mu don share cin zarafi, na gode!
Zhejiang NeoDen Technology Co., Ltd. yana kera da fitar da kananan injunan karba da wuri daban-daban tun daga 2010. Yin amfani da fa'idodin R&D masu arziƙin namu, samar da ingantaccen horarwa, NeoDen ya sami babban suna daga abokan cinikin duniya.
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