MOSFET Anti-Reverse Circuit

Ntlha ea pele, molao-motheo oa MOSFET-anti-reverse circuit

MOSFET anti-reverse circuit e sebelisa li-switching tsa MOSFET, ka ho laola motlakase oa heke (G) ho hlokomela potoloho le ho tima. Ha polarity ea phepelo ea motlakase e nepahetse, motlakase oa heke o etsa hore MOSFET e be boemong ba conduction, hona joale e ka phalla ka mokhoa o tloaelehileng; ha polarity ea phepelo ea motlakase e khutlisetsoa morao, motlakase oa heke ha o khone ho etsa conduction ea MOSFET, ka hona o khaola potoloho.

Ea bobeli, ho phethahala ho itseng ha potoloho ea anti-reverse ea MOSFET

1. N-channel MOSFET anti-reverse circuit

Li-MOSFET tsa N-channel hangata li sebelisoa ho hlokomela li-circuits tse thibelang ho khutlela morao. Potolohong, mohloli (S) oa N-channel MOSFET o hokahantsoe le terminal e mpe ea mojaro, drain (D) e hokahantsoe le terminal e ntle ea phepelo ea motlakase, mme heke (G) e hokahantsoe le terminal e mpe ya phepelo ya motlakase ka sehanyetsi kapa e laolwang ke sedikadikwe sa taolo.

Khokahano ea pele: terminal e ntle ea phepelo ea motlakase e hokahane le D, 'me terminal e mpe e hokahane le S. Ka nako ena, mohanyetsi o fana ka motlakase oa mohloli oa heke (VGS) bakeng sa MOSFET, mme ha VGS e le kholo ho feta monyako. voltage (Vth) ea MOSFET, MOSFET e tsamaisa, 'me motlakase o phalla ho tloha setsing se setle sa phepelo ea motlakase ho ea ho mojaro ka MOSFET.

Ha e khutlisetsoa morao: sebaka se setle sa phepelo ea motlakase se hokahane le S, 'me terminal e mpe e hokahane le D. Ka nako ena, MOSFET e boemong ba ho khaola 'me potoloho e khaotsoe ho sireletsa mojaro ho senya hobane motlakase oa heke. ha e khone ho theha VGS e lekaneng ho etsa boitšoaro ba MOSFET (VGS e ka ba ka tlase ho 0 kapa ka tlase haholo ho Vth).

2. Karolo ea Likarolo tse Thusang

Resistor: E sebelisoa ho fana ka motlakase oa mohloli oa heke bakeng sa MOSFET le ho fokotsa matla a heke ho thibela tšenyo e fetang ea heke.

Voltage regulator: karolo ea boikhethelo e sebelisoang ho thibela motlakase oa mohloli oa heke hore o se be holimo haholo le ho pshatla MOSFET.

Parasitic Diode: Diode ea parasitic (body diode) e teng ka har'a MOSFET, empa phello ea eona hangata e hlokomolohuoa kapa e qojoa ke moralo oa potoloho ho qoba phello ea eona e mpe ho li-circuits tse thibelang ho khutlela morao.

Ea boraro, melemo ea potoloho ea MOSFET anti-reverse

 

Tahlehelo e tlase: MOSFET on-resistance e nyane, motlakase oa on-resistance o fokotsehile, kahoo tahlehelo ea potoloho e nyane.

 

 

Ho tšepahala ho phahameng: ts'ebetso e khahlanong le ho khutlela morao e ka etsoa ka moralo o bonolo oa potoloho, 'me MOSFET ka boeona e na le boemo bo phahameng ba ho tšepahala.

 

Ho feto-fetoha ha maemo: mefuta e fapaneng ea MOSFET le meralo ea potoloho e ka khethoa ho fihlela litlhoko tse fapaneng tsa kopo.

 

Mehato ya tlhokomelo

 

Moqaping oa MOSFET anti-reverse circuit, o hloka ho etsa bonnete ba hore khetho ea MOSFET e finyella litlhoko tsa kopo, ho kenyelletsa le motlakase, hona joale, lebelo la ho fetola le li-parameter tse ling.

 

Hoa hlokahala ho nahana ka tšusumetso ea likarolo tse ling tsa potoloho, tse kang parasitic capacitance, inductance parasitic, joalo-joalo, e le ho qoba liphello tse mpe mosebetsing oa potoloho.

 

Lits'ebetsong tse sebetsang, tlhahlobo le netefatso e lekaneng e boetse e hlokahala ho netefatsa botsitso le ts'epahalo ea potoloho.

 

Ka bokhutšoanyane, MOSFET anti-reverse circuit ke mokhoa o bonolo, o ka tšeptjoang le o fokolang oa ts'ireletso ea phepelo ea motlakase o sebelisoang haholo lits'ebetsong tse fapaneng tse hlokang ho thibela polarity ea morao-rao ea matla.