MOSFET Anti-Reverse Circuit

Choyamba, mfundo yofunikira ya MOSFET anti-reverse circuit

MOSFET anti-reverse circuit pogwiritsa ntchito kusintha kwa MOSFET, poyang'anira magetsi a gate (G) kuti azindikire kuzungulira ndi kuzimitsa. Pamene polarity magetsi ali olondola, voteji pachipata chimapangitsa MOSFET mu conduction boma, panopa akhoza kuyenda bwinobwino; pamene polarity mphamvu ndi m'mbuyo, voteji pachipata sangathe kupanga MOSFET conduction, motero kudula dera.

Chachiwiri, kukwaniritsidwa kwapadera kwa MOSFET anti-reverse circuit

1. N-channel MOSFET anti-reverse circuit

Ma MOSFET a N-channel nthawi zambiri amagwiritsidwa ntchito kuzindikira mabwalo otsutsana ndi reverse. M'derali, gwero (S) la N-channel MOSFET limalumikizidwa ndi chotengera choyipa cha katundu, kukhetsa (D) kumalumikizidwa ku terminal yabwino yamagetsi, ndipo chipata (G) chimalumikizidwa ndi malo oyipa amagetsi opangira magetsi kudzera pa chopinga kapena kuyendetsedwa ndi dera lowongolera.

Kulumikizana kwapatsogolo: malo abwino opangira magetsi amalumikizidwa ndi D, ndipo cholumikizira cholakwika chimalumikizidwa ndi S. Panthawiyi, chopingacho chimapereka mphamvu yamagetsi yamagetsi (VGS) ya MOSFET, ndipo VGS ikakulirakulira. voliyumu (Vth) ya MOSFET, MOSFET imayendetsa, ndipo pano imayenda kuchokera ku terminal yabwino yamagetsi kupita ku katundu kudzera mu MOSFET.

Ikasinthidwa: malo abwino opangira magetsi amalumikizidwa ndi S, ndipo cholumikizira choyipa chimalumikizidwa ndi D. Panthawiyi, MOSFET ili m'malo opumira ndipo dera limachotsedwa kuti liteteze katundu ku kuwonongeka chifukwa magetsi a pachipata. sichikhoza kupanga VGS yokwanira kuti ipange machitidwe a MOSFET (VGS ikhoza kukhala yocheperapo 0 kapena yocheperapo kuposa Vth).

2. Udindo wa Zida Zothandizira

Resistor: Amagwiritsidwa ntchito popereka mphamvu yamagetsi yachipata cha MOSFET ndikuchepetsa zipata zapano kuti mupewe kuwonongeka kwa chipata.

Voltage regulator: gawo losasankha lomwe limagwiritsidwa ntchito kuletsa mphamvu yamagetsi pachipata kuti isakwere kwambiri ndikuphwanya MOSFET.

Parasitic Diode: Diode ya parasitic (body diode) imapezeka mkati mwa MOSFET, koma zotsatira zake nthawi zambiri zimanyalanyazidwa kapena kupewedwa ndi mapangidwe a dera kuti apewe kuwononga kwake m'mabwalo otsutsana ndi reverse.

Chachitatu, ubwino wa MOSFET anti-reverse circuit

Kutayika kochepa: MOSFET pa-kukaniza ndi yaying'ono, magetsi oletsa kukana amachepetsedwa, kotero kutayika kwa dera kumakhala kochepa.

Kudalirika kwakukulu: ntchito yotsutsa-reverse imatha kuzindikirika kudzera mumayendedwe osavuta a dera, ndipo MOSFET yokha imakhala yodalirika kwambiri.

Kusinthasintha: mitundu yosiyanasiyana ya MOSFET ndi mapangidwe ozungulira amatha kusankhidwa kuti akwaniritse zofunikira zosiyanasiyana.

Kusamalitsa

Pakukonza kwa MOSFET anti-reverse circuit, muyenera kuonetsetsa kuti kusankha kwa MOSFET kukwaniritsa zofunikira zogwiritsira ntchito, kuphatikizapo magetsi, panopa, liwiro la kusintha ndi zina.

Ndikofunikira kuganizira mphamvu ya zigawo zina mu dera, monga parasitic capacitance, parasitic inductance, etc., pofuna kupewa zotsatira zoipa pa ntchito dera.

Muzogwiritsira ntchito, kuyesa kokwanira ndi kutsimikizira kumafunikanso kuti zitsimikizire kukhazikika ndi kudalirika kwa dera.

Mwachidule, MOSFET anti-reverse circuit ndi njira yosavuta, yodalirika komanso yotsika kwambiri yotetezera magetsi yomwe imagwiritsidwa ntchito kwambiri pazinthu zosiyanasiyana zomwe zimafuna kupewa polarity reverse power.