Maemo a kopo ea li-MOSFET ke afe?

Li-MOSFET li sebelisoa haholo lipotolohong tsa analog le tsa dijithale 'me li amana haufi-ufi le bophelo ba rona.Melemo ea MOSFET ke: "drive circuit e batla e le bonolo.MOSFETs e hloka koloi e fokolang hona joale ho feta BJTs,' me hangata e ka khannoa ka ho toba ke CMOS kapa "mokelli ea bulehileng". Lipotoloho tsa mokhanni oa TTL. Ea bobeli, li-MOSFET li fetoha ka potlako 'me li ka sebetsa ka lebelo le phahameng hobane ha ho na phello ea polokelo ea tefiso. Ho feta moo, li-MOSFET ha li na mokhoa oa bobeli oa ho hloleha ho senyeha. Ha mocheso o phahame, hangata o matla ho mamella, o fokotsa monyetla oa ho senyeha ha mocheso, empa hape le mocheso o pharaletseng ho fana ka ts'ebetso e ntlafetseng.MOSFET e 'nile ea sebelisoa ka bongata ba likopo, ho lisebelisoa tsa elektronike tsa bareki, lihlahisoa tsa indasteri, electromechanical. lisebelisoa, lifono tse bohlale le lihlahisoa tse ling tsa elektronike tse nkehang habonolo li ka fumanoa hohle.

Tlhahlobo ea nyeoe ea kopo ea MOSFET

1. Ho fetola lisebelisoa tsa motlakase

Ka tlhaloso, ts'ebeliso ena e hloka hore MOSFET e sebetse le ho koala nako le nako. Ka nako e ts'oanang, ho na le li-topology tse ngata tse ka sebelisoang bakeng sa ho fetola phepelo ea motlakase, joalo ka phepelo ea motlakase ea DC-DC e sebelisoang hangata ho converter ea buck e itšetlehileng ka li-MOSFET tse peli ho etsa ts'ebetso ea ho switjha, li-switches tsena ka tsela e fapaneng ho inductor ho boloka. matla, ebe o bula matla ho mojaro. Hona joale, baqapi ba atisa ho khetha maqhubu ka makholo a kHz esita le ka holimo ho 1MHz, ka lebaka la hore maqhubu a phahameng, a nyenyane le a bobebe a likaroloana tsa makenete. Mekhahlelo ea bobeli ea bohlokoa ka ho fetisisa ea MOSFET ho phepelong ea phepelo ea motlakase e kenyelletsa matla a tlhahiso, matla a threshold voltage, impedance ea heke le matla a avalanche.

2, lisebelisoa tsa ho laola motlakase

Lisebelisoa tsa taolo ea makoloi ke sebaka se seng sa kopo ea matlaMOSFETs. Li-circuits tse tloaelehileng tsa taolo ea halofo ea borokho li sebelisa li-MOSFET tse peli (borokho bo felletseng bo sebelisa tse 'ne), empa li-MOSFET tse peli tsa nako (nako e shoeleng) lia lekana. Bakeng sa ts'ebeliso ena, nako ea ho khutlisa (trr) e bohlokoa haholo. Ha o laola mojaro oa inductive (joalo ka motor winding), potoloho ea taolo e chencha MOSFET ka har'a potoloho ea borokho ho ea sebakeng se kantle, ka nako eo switjha e 'ngoe ea potoloho ea borokho e khutlisetsang morao ka nakoana ka diode ea' mele ho MOSFET. Kahoo, hona joale ho potoloha hape 'me ho tsoela pele ho matlafatsa motlakase. Ha MOSFET ea pele e sebetsa hape, tefiso e bolokiloeng ka har'a diode e 'ngoe ea MOSFET e tlameha ho tlosoa le ho lokolloa ka MOSFET ea pele. Sena ke tahlehelo ea matla, kahoo ha trr e le khuts'oane, tahlehelo e ba nyane.

3, lisebelisoa tsa likoloi

Tšebeliso ea matla a MOSFET lits'ebetsong tsa likoloi e hotse ka potlako lilemong tse 20 tse fetileng. MatlaMOSFETe khethiloe hobane e ka mamella liketsahalo tsa nakoana tse phahameng tsa motlakase tse bakoang ke lisebelisoa tse tloaelehileng tsa elektronike tsa likoloi, tse kang ho lahleheloa ke thepa le liphetoho tse potlakileng tsa matla a tsamaiso, 'me sephutheloana sa eona se bonolo, haholo-holo se sebelisa liphutheloana tsa TO220 le TO247. Ka nako e ts'oanang, lisebelisoa tse kang lifensetere tsa motlakase, ente ea mafura, li-wiper tsa nakoana, le taolo ea maeto butle-butle li fetoha maemo a tloaelehileng likoloing tse ngata, 'me lisebelisoa tse tšoanang tsa motlakase lia hlokahala moralong. Nakong ena, li-MOSFET tsa matla a likoloi li ile tsa fetoha li-motor, solenoids, le li-injection tsa mafura li ile tsa tsebahala haholoanyane.

Li-MOSFET tse sebelisoang lisebelisoa tsa likoloi li koahela mefuta e mengata e fapaneng ea li-voltage, maqhubu le li-on-resistance. Lisebelisoa tsa ho laola motlakase li sebelisa mekhoa ea motlakase ea ho senyeha ha 30V le 40V, lisebelisoa tsa 60V li sebelisetsoa ho khanna meroalo moo ho tlameha ho laoloa ke maemo a tšohanyetso a ho theola mojaro le ho qala ho phahama, 'me theknoloji ea 75V e hlokahala ha maemo a indasteri a fetisetsoa ho lisebelisoa tsa betri tsa 42V. Lisebelisoa tse phahameng tsa motlakase tse thusang li hloka tšebeliso ea mefuta ea 100V ho isa ho 150V, 'me lisebelisoa tsa MOSFET tse ka holimo ho 400V li sebelisoa li-unit tsa bakhanni ba enjene le li-circuits tsa taolo bakeng sa mabone a phahameng a matla a ho ntša metsi (HID).

Maqhubu a koloi a MOSFET a tloha ho 2A ho isa ho 100A, 'me a hanyetsa ho tloha ho 2mΩ ho isa ho 100mΩ. Meroalo ea MOSFET e kenyelletsa lienjineri, li-valve, mabone, lisebelisoa tsa ho futhumatsa, likopano tsa capacitive piezoelectric le lisebelisoa tsa motlakase tsa DC/DC. Maqhubu a ho chencha hangata a tloha ho 10kHz ho isa ho 100kHz, ka temoso ea hore taolo ea enjene ha e ea lokela ho chencha maqhubu ka holimo ho 20kHz. Litlhokahalo tse ling tse kholo ke ts'ebetso ea UIS, maemo a ts'ebetso moeling oa mocheso oa mateano (-40 likhato ho isa ho likhato tse 175, ka linako tse ling ho fihlela ho likhato tse 200) le ho ts'epahala ho feta bophelo ba koloi.

4, mabone a LED le mokhanni oa mabone

Moqapi oa mabone a LED le mabone hangata a sebelisa MOSFET, bakeng sa mokhanni oa kamehla oa LED, hangata a sebelisa NMOS. matla MOSFET le bipolar transistor hangata li fapane. Capacitance ea eona ea heke e batla e le khōlō. Capacitor e hloka ho lefisoa pele e etsoa. Ha motlakase oa capacitor o feta matla a monyako, MOSFET e qala ho tsamaisa. Ka hona, ke habohlokoa ho hlokomela nakong ea moralo hore boima ba mojaro oa mokhanni oa heke bo hloka ho ba boholo bo lekaneng ho etsa bonnete ba hore tefiso ea capacitance e lekanang ea heke (CEI) e phethoa ka nako e hlokoang ke tsamaiso.

Lebelo la ho fetoha ha MOSFET le itšetlehile haholo ka ho tjhaja le ho ntša matla a ho kenya. Le hoja mosebedisi a ke ke a fokotsa boleng ba Cin, empa a ka fokotsa boleng ba heke drive loop signal mohloli oa ho hanyetsa ka hare ho li-Rs, kahoo a fokotsa ho tjhaja ha loop ea heke le ho qeta nako e tsitsitseng, ho potlakisa lebelo la ho fetola, bokhoni ba kakaretso ba IC drive. e bonahala haholo mona, re re khetho eaMOSFETe bua ka li-IC tsa morao-rao tsa MOSFET tsa kantle. li-IC tsa MOSFET tse hahelletsoeng ha li hloke ho nahanoa. Ka kakaretso, MOSFET ea kantle e tla shejoa bakeng sa maqhubu a fetang 1A. E le ho fumana matla a matla a LED a maholoanyane le a fetohang haholoanyane, MOSFET ea kantle ke eona feela tsela ea ho khetha IC e hloka ho tsamaisoa ke bokhoni bo nepahetseng, 'me matla a ho kenya MOSFET ke parameter ea bohlokoa.