Maxay yihiin sababaha kulaylka MOSFET ee beddelka?

QalabeeyahaMOSFET-yadaku shaqee xaalad beddelasho oo hadda qulqulaya tubooyinka waa mid aad u sarreeya. Haddii tuubada aan si sax ah loo dooran, baaxadda korantada wadista kuma filna ama kala daadinta kulaylka wareeggu ma fiicna, waxay keeni kartaa MOSFET inay kululaato.

1, inverter MOSFET kululaynta waa halis, waa in fiiro gaar ah u xulashada MOSFET

MOSFET in inverter ee gobolka beddelka, guud ahaan u baahan in ay dheecaan hadda sida weyn ee suurtogalka ah, on-iska caabin ah sida ugu yar ee suurtogalka ah, taas oo yareyn karta dhibicda danab saturation ee tuubada, oo sidaas hoos u tuubada tan iyo isticmaalka, yareeyo kulaylka.

Fiiri buug-gacmeedka MOSFET, waxaan ogaan doonaa in mar kasta oo MOSFET ay sare u kacdo qiimaha iska caabbinta ee MOSFET, ay sii badanayso iska caabbinta, iyo kuwa leh qulqulka sare ee hadda iyo qiimaha adkaysiga hooseeya ee tuubada, iska caabintiisu guud ahaan way ka hoosaysaa tobanaan millihms.

Iyadoo loo maleynayo in hadda culeyska 5A, waxaan dooraneynaa inverter sida caadiga ah loo isticmaalo MOSFET RU75N08R iyo danab u adkeysan kara qiimaha 500V 840 waxay noqon kartaa, qulqulkooda hadda waxay ku jiraan 5A ama ka badan, laakiin iska caabinta labada tuubbo way ka duwan tahay, wad isla hadda. , Kala duwanaanshahooda kulaylkoodu aad buu u weyn yahay. 75N08R on-resistance waa 0.008Ω kaliya, halka iska caabbinta 840 ay tahay 0.85Ω, marka culeyska hadda socda ee tuubada ay yihiin 5A, 75N08R tuubada korantada waa 0.04V oo keliya, waqtigan, isticmaalka tuubada MOSFET waa Kaliya 0.2W, halka hoos u dhaca tuubada 840 uu noqon karo ilaa 4.25W, Isticmaalka tuubada ayaa ah mid aad u sareysa ilaa 21.25W. Laga soo bilaabo tan waxaa laga arki karaa, iska caabin yar ee MOSFET rogayaasha ayaa ka wanaagsan, caabbinta tuubada waa weyn tahay, isticmaalka tuubada hoosteeda sare. sida ugu macquulsan.

2, wareegga wadista ee baaxadda danab wadista ma aha mid ku filan

MOSFET waa qalab kontorool koronto, haddii aad rabto in aad hoos u isticmaalka tuubada, yareeyo kulaylka,MOSFETBalaadhka danabka albaabka albaabka waa inuu ahaadaa mid weyn oo ku filan in lagu wado cidhifka garaaca wadnaha si uu u ahaado mid qotodheer oo toosan, waxaad yarayn kartaa hoos u dhaca danabka tuubada, yaraynta isticmaalka tuubada.

3, MOSFET kuleylka kulaylka ma aha sabab wanaagsan

rogrogeMOSFETkululaynta waa halis. Maaddaama isticmaalka tamarta MOSFET beddelka uu weyn yahay, shaqadu guud ahaan waxay u baahan tahay aag weyn oo dibedda ah oo ku filan kuleylka, iyo kuleylka dibedda iyo MOSFET lafteeda inta u dhexeysa heatsink waa inay xiriir dhow la yeeshaan (guud ahaan loo baahan yahay in lagu daboolo dufan silikoon ah oo kuleyl leh. ), haddii kulaylka dibadda uu ka yaraado, ama xidhiidhka MOSFET's heatsink-keeda uusan ku filnayn, waxay keeni kartaa kuleyliyaha tuubada.

Inverter MOSFET kululaynta halis ah waxaa jira afar sababood oo kooban.

MOSFET kuleyl yar waa dhacdo caadi ah, laakiin kuleyl halis ah, xitaa taasoo horseedaysa tuubada waa gubatay, waxaa jira afar sababood oo soo socda:

1, dhibaatada naqshadeynta wareegga

MOSFET ha ku shaqeyso qaab hawleed toosan, halkii ay ka ahaan lahayd wareegga wareegga wareegga. Sidoo kale waa mid ka mid ah sababaha MOSFET kulaylinta. Haddii N-MOS ay samaynayso beddelka, korantada heerka G-gu waa in ay ahaataa dhowr V ka sarreeya sahayda korontada si ay si buuxda u shido, halka P-MOS ay ka soo horjeedaan. Aan si buuxda u furnayn oo hoos u dhaca danabku aad buu u weyn yahay taas oo keentay isticmaalka korantada, isugeynta DC ee u dhiganta ayaa ka weyn, hoos u dhaca danabku wuu kordhiyaa, sidaas darteed U * I sidoo kale wuu kordhiyaa, luminta macnaheedu waa kulayl. Tani waa qaladka ugu badan ee laga fogaado ee naqshadeynta wareegga.

2, soo noqnoqosho aad u sarreeya

Sababta ugu weyn ayaa ah in mararka qaarkood raadinta xad-dhaafka ah ee mugga, taasoo keentay soo noqnoqoshada korodhka, MOSFET khasaaraha weyn, sidaas darteed kulaylku sidoo kale waa la kordhiyaa.

3, oo aan ku filnayn naqshad kuleyl

Haddii hadda uu aad u sarreeyo, qiimaha hadda jira ee MOSFET, badanaa wuxuu u baahan yahay kuleyl wanaagsan si loo gaaro. Markaa aqoonsigu wuu ka yar yahay kan hadda ugu sarreeya, waxa kale oo laga yaabaa inuu si xun u kululaado, wuxuu u baahan yahay weel kuleyl ah oo ku filan.

4, xulashada MOSFET waa khalad

Xukunka khaldan ee awoodda, MOSFET iska caabin gudaha ah si buuxda looma tixgalin, taasoo keentay kororka is beddelka.