MOSFET anti-reverse circuit yog ib qho kev tiv thaiv uas siv los tiv thaiv lub voj voog ntawm kev puas tsuaj los ntawm kev rov qab fais fab polarity. Thaum lub hwj huam mov polarity yog lawm, lub Circuit Court ua haujlwm ib txwm; thaum lub hwj chim mov polarity yog thim rov qab, lub Circuit Court yog txiav txiav, yog li tiv thaiv lub load los ntawm kev puas tsuaj. Cov hauv qab no yog cov ncauj lus kom ntxaws tsom xam ntawm MOSFET anti-reverse circuit:
Ua ntej, lub hauv paus ntsiab lus ntawm MOSFET anti-reverse circuit
MOSFET tiv thaiv rov qab Circuit Court siv cov yam ntxwv hloov pauv ntawm MOSFET, los ntawm kev tswj lub rooj vag (G) voltage kom paub txog lub Circuit Court rau thiab tawm. Thaum lub hwj huam mov polarity yog lawm, lub rooj vag voltage ua rau MOSFET nyob rau hauv lub conduction lub xeev, cov tam sim no yuav ntws ib txwm; Thaum lub hwj huam mov polarity yog thim rov qab, lub rooj vag voltage tsis tuaj yeem ua rau MOSFET conduction, yog li txiav tawm lub voj voog.
Qhov thib ob, qhov kev paub tshwj xeeb ntawm MOSFET tiv thaiv rov qab Circuit Court
1. N-channel MOSFET anti-reverse circuit
N-channel MOSFETs feem ntau yog siv los paub txog kev tiv thaiv rov qab circuits. Hauv Circuit Court, qhov chaw (S) ntawm N-channel MOSFET txuas nrog lub davhlau ya nyob twg tsis zoo ntawm lub thauj khoom, qhov ntws (D) txuas nrog lub davhlau ya nyob twg zoo ntawm lub zog, thiab lub rooj vag (G) txuas nrog. qhov tsis zoo davhlau ya nyob twg ntawm lub hwj chim mov los ntawm ib tug resistor los yog tswj los ntawm ib tug tswj Circuit Court.
Kev sib txuas rau pem hauv ntej: lub davhlau ya nyob twg zoo ntawm cov khoom siv hluav taws xob txuas nrog D, thiab lub davhlau ya nyob twg tsis zoo txuas nrog S. Lub sijhawm no, tus resistor muab lub rooj vag qhov hluav taws xob (VGS) rau MOSFET, thiab thaum VGS ntau dua qhov pib. voltage (Vth) ntawm MOSFET, MOSFET ua, thiab tam sim no ntws los ntawm qhov zoo ntawm lub hwj chim mov mus rau lub load los ntawm MOSFET.
Thaum thim rov qab: lub davhlau ya nyob twg zoo ntawm cov khoom siv hluav taws xob txuas nrog S, thiab lub davhlau ya nyob twg tsis zoo txuas nrog D. Lub sijhawm no, MOSFET nyob rau hauv lub xeev txiav tawm thiab lub Circuit Court raug txiav tawm los tiv thaiv lub nra ntawm kev puas tsuaj vim lub qhov rooj voltage. tsis tuaj yeem tsim VGS txaus los ua MOSFET kev coj ua (VGS yuav tsawg dua 0 lossis ntau dua Vth).
2. Lub luag haujlwm ntawm Pab Pawg Pabcuam
Resistor: Siv los muab lub rooj vag qhov hluav taws xob rau MOSFET thiab txwv lub rooj vag tam sim no los tiv thaiv lub rooj vag overcurrent puas.
Voltage regulator: ib qho kev xaiv siv los tiv thaiv lub qhov rooj qhov hluav taws xob los ntawm kev siab dhau thiab ua rau MOSFET.
Parasitic Diode: Cov kab mob parasitic diode (lub cev diode) muaj nyob rau hauv MOSFET, tab sis nws cov nyhuv feem ntau tsis quav ntsej lossis zam los ntawm kev tsim hluav taws xob kom tsis txhob muaj qhov cuam tshuam rau hauv kev tiv thaiv rov qab.
Thib peb, qhov zoo ntawm MOSFET anti-reverse circuit
Kev poob qis: MOSFET ntawm qhov tsis kam yog me me, qhov hluav taws xob ntawm qhov tsis kam raug txo, yog li qhov kev poob qis me me.
Kev ntseeg siab: kev ua haujlwm rov qab tuaj yeem pom tau los ntawm kev tsim hluav taws xob yooj yim, thiab MOSFET nws tus kheej muaj kev ntseeg siab.
Flexibility: Cov qauv MOSFET sib txawv thiab cov qauv tsim hluav taws xob tuaj yeem raug xaiv kom ua tau raws li cov ntawv thov sib txawv.
Cov kev ceev faj
Hauv kev tsim ntawm MOSFET tiv thaiv rov qab Circuit Court, koj yuav tsum xyuas kom meej tias kev xaiv ntawm MOSFETs kom tau raws li daim ntawv thov, suav nrog voltage, tam sim no, hloov ceev thiab lwm yam tsis.
Nws yog ib qho tsim nyog yuav tsum xav txog kev cuam tshuam ntawm lwm yam hauv Circuit Court, xws li parasitic capacitance, parasitic inductance, thiab lwm yam.
Hauv kev siv cov tswv yim, kev sim thiab kev txheeb xyuas kom txaus yuav tsum tau ua kom muaj kev ruaj ntseg thiab kev ntseeg siab ntawm lub voj voog.
Hauv cov ntsiab lus, MOSFET anti-reverse circuit yog ib qho yooj yim, txhim khu kev qha thiab tsis tshua muaj hluav taws xob tiv thaiv kev tiv thaiv uas tau siv dav hauv ntau daim ntawv thov uas xav tau kev tiv thaiv rov qab fais fab polarity.
Post lub sij hawm: Sep-13-2024
