MOSFET Anti-Reverse Circuit

Iyo MOSFET anti-reverse circuit chiyero chekudzivirira chinoshandiswa kudzivirira kutakurwa kwedunhu kubva pakukuvadzwa nereverse power polarity. Apo simba rekupa polarity rakarurama, dunhu rinoshanda zvakajairika; apo simba rekupa polarity rinodzorerwa shure, dunhu rinobva ravharwa, nokudaro kudzivirira mutoro kubva pakukuvadzwa. Iyi inotevera ongororo yakadzama yeMOSFET anti-reverse redunhu:

Kutanga, musimboti wekutanga weMOSFET anti-reverse wedunhu

MOSFET anti-reverse wedunhu ichishandisa switching maitiro eMOSFET, nekudzora gedhi (G) voltage kuti ione dunhu rakabatidzwa nekudzima. Kana simba rekupa polarity rakarurama, gedhi remagetsi rinogadzira MOSFET mumamiriro ekuitisa, ikozvino inogona kuyerera zvakajairika; kana simba rekupa polarity radzoserwa, gedhi voltage haigone kuita iyo MOSFET conduction, nekudaro ichicheka dunhu.

Chechipiri, kunyatsoitika kweMOSFET anti-reverse circuit

1. N-channel MOSFET anti-reverse circuit

N-channel MOSFETs inowanzo shandiswa kuona anti-reverse maseketi. Mudunhu, sosi (S) yeN-channel MOSFET yakabatana kune iyo isina kunaka terminal yemutoro, iyo dhiraivha (D) yakabatana kune yakanaka terminal yemagetsi, uye gedhi (G) rakabatana iyo yakaipa terminal yemagetsi emagetsi kuburikidza neanopikisa kana kudzorwa nedunhu rekutonga.

Kubatana kwepamberi: iyo yakanaka terminal yemagetsi yakabatana neD, uye iyo isina kunaka terminal yakabatana neS. Panguva ino, iyo resistor inopa gedhi source voltage (VGS) yeMOSFET, uye kana VGS yakakura kupfuura chikumbaridzo. voltage (Vth) yeMOSFET, iyo MOSFET inoitisa, uye ikozvino inoyerera kubva kune yakanaka terminal yemagetsi ekupa mutoro kuburikidza neMOSFET.

Kana yakadzoserwa: iyo yakanaka terminal yemagetsi yakabatana neS, uye iyo isina kunaka terminal yakabatana neD. Panguva ino, MOSFET iri mu cutoff state uye dunhu rinobviswa kudzivirira mutoro kubva mukukuvadzwa nekuti gedhi voltage. haikwanise kuumba VGS yakakwana kuita MOSFET mufambiro (VGS inogona kunge iri pasi pe0 kana kuti yakaderera pane Vth).

2. Basa reKubatsira Zvikamu

Resistor: Inoshandiswa kupa gedhi sosi voltage yeMOSFET uye kumisa gedhi razvino kudzivirira gedhi rakawandisa kukuvara.

Voltage regulator: chinhu chinosarudzika chinoshandiswa kudzivirira gedhi sosi voltage kuti isanyanya kukwirira uye kuputsa MOSFET.

Parasitic Diode: A parasitic diode (body diode) iripo mukati meMOSFET, asi maitiro ayo anowanzo furatirwa kana kudziviswa nedhizaini dhizaini kudzivirira kukanganisa kwayo mumasekete anopikisa.

Chechitatu, zvakanakira iyo MOSFET anti-reverse wedunhu

Kurasikirwa kwakaderera: MOSFET pa-resistance idiki, iyo pa-resistance voltage yakaderedzwa, saka kurasikirwa kwedunhu kudiki.

Kuvimbika kwepamusoro: anti-reverse basa rinogona kuitika kuburikidza neyakapfava dhizaini dhizaini, uye iyo MOSFET pachayo ine yakakwira mwero wekuvimbika.

Kuchinjika: akasiyana MOSFET modhi uye dhizaini dhizaini inogona kusarudzwa kuti isangane nezvinodiwa zvakasiyana zvekushandisa.

Zvekungwaririra

Mukugadzirwa kweMOSFET anti-reverse wedunhu, unofanirwa kuve nechokwadi chekuti kusarudzwa kweMOSFET kuzadzisa zvinodiwa zvekushandisa, zvinosanganisira voltage, ikozvino, switching kumhanya uye mamwe ma paramita.

Izvo zvinodikanwa kufunga nezve kupesvedzera kwezvimwe zvikamu mudunhu, senge parasitic capacitance, parasitic inductance, nezvimwewo, kuitira kuti udzivise mhedzisiro yakaipa pakuita redunhu.

Mumashandisirwo anoshanda, kuyedzwa kwakakwana uye kuisirwa kunodiwa zvakare kuve nechokwadi kugadzikana uye kuvimbika kwedunhu.

Muchidimbu, MOSFET anti-reverse circuit iri nyore, yakavimbika uye yakaderera-kurasikirwa kwesimba rekuchengetedza simba rinoshandiswa zvakanyanya mumhando dzakasiyana-siyana dzekushandisa dzinoda kudzivirira reverse power polarity.