Kuthekera kwa zipata, kukana ndi magawo ena a MOSFET

I. Chipata cha mphamvu

Kuthekera kwa zipata makamaka kumaphatikizapo luso lolowetsa (Ciss), mphamvu zotulutsa (Coss) ndi mphamvu yosinthira (Crss, yomwe imadziwikanso kuti Miller capacitance).

 

Mphamvu Zolowetsa (Ciss):

 

Tanthauzo: Mphamvu yolowera ndi mphamvu yonse pakati pa chipata ndi gwero ndi kukhetsa, ndipo imakhala ndi chipata cha gwero lachipata (Cgs) ndi chipata cholowera pakhomo (Cgd) cholumikizidwa mofanana, mwachitsanzo, Ciss = Cgs + Cgd.

 

Ntchito: Mphamvu yolowera imakhudza kuthamanga kwa MOSFET. Pamene athandizira capacitance mlandu kwa voteji pakhomo, chipangizo akhoza anatsegula; kutulutsidwa ku mtengo wina, chipangizocho chikhoza kuzimitsidwa. Chifukwa chake, mayendedwe oyendetsa ndi Ciss amakhudza mwachindunji kuyatsa kwa chipangizocho ndikuchedwa kuzimitsa.

 

Mphamvu zotulutsa (Coss):

Tanthauzo: Mphamvu yotulutsa ndi mphamvu yokwanira pakati pa kukhetsa ndi gwero, ndipo imakhala ndi mphamvu ya drain-source capacitance (Cds) ndi mphamvu ya gate-drain capacitance (Cgd) mofanana, mwachitsanzo Coss = Cds + Cgd.

 

Ntchito: Pakusintha kofewa, Coss ndiyofunikira kwambiri chifukwa imatha kuyambitsa kumveka kozungulira.

 

Reverse Transmission Capacitance (Crss):

Tanthauzo: The reverse transfer capacitance ndi ofanana ndi gate drain capacitance (Cgd) ndipo nthawi zambiri amatchedwa Miller capacitance.

 

Udindo: Mphamvu yosinthira kumbuyo ndi gawo lofunikira pakukwera ndi kugwa kwa switch, komanso imakhudzanso nthawi yoyimitsa. Mphamvu ya capacitance imachepa pamene mphamvu ya drain-source ikuwonjezeka.

II. Kukaniza (maRds (pa))

 

Tanthauzo: Kukaniza ndiko kukana pakati pa gwero ndi kukhetsa kwa MOSFET m'boma pansi pamikhalidwe inayake (mwachitsanzo, kutayikira komweku, magetsi a pachipata, ndi kutentha).

 

Zomwe zimakhudzidwa: Kukaniza sikuli mtengo wokhazikika, kumakhudzidwa ndi kutentha, kutentha kwapamwamba, kukulirakulira kwa Rds (pa). Kuphatikiza apo, kukweza kwamphamvu kwamagetsi, kukulitsa mawonekedwe amkati a MOSFET, kumapangitsanso kukana kofananira.

 

 

Kufunika: Popanga magetsi osinthira kapena mayendedwe oyendetsa, ndikofunikira kuganizira kukana kwa MOSFET, chifukwa zomwe zikuyenda kudzera mu MOSFET zitha kugwiritsa ntchito mphamvu pakukana uku, ndipo gawo ili la mphamvu zomwe zimagwiritsidwa ntchito limatchedwa pa- kukana kutaya. Kusankha MOSFET yokhala ndi kukana pang'ono kumatha kuchepetsa kutayika kwa kukana.

 

Chachitatu, magawo ena ofunikira

Kuphatikiza pa kuthekera kwa chipata komanso kukana, MOSFET ili ndi magawo ena ofunikira monga:

V(BR)DSS (Drain Source Breakdown Voltage):Mphamvu yamagetsi ya drainage yomwe madzi akuyenda mumtsinje amafika pamtengo winawake pa kutentha kwina ndipo chipata chikafupika. Pamwamba pa mtengo uwu, chubu chikhoza kuwonongeka.

 

VGS(th) (Threshold Voltage):Mphamvu yamagetsi yomwe imafunikira kuti njira yoyendetsera iyambe kupanga pakati pa gwero ndi kukhetsa. Kwa ma MOSFET wamba a N-channel, VT ndi pafupifupi 3 mpaka 6V.

 

ID (Maximum Continuous Drain Current):The pazipita mosalekeza DC panopa kuti akhoza kuloledwa ndi Chip pa pazipita oveteredwa mphambano kutentha.

 

IDM (Maximum Pulsed Drain Current):Imawonetsa kuchuluka kwa ma pulsed panopa omwe chipangizochi chingathe kupirira, ndi pulsed current yomwe ili yokwera kwambiri kuposa DC yopitirira.

 

PD (kuwonongeka kwakukulu kwa mphamvu):chipangizocho chikhoza kusokoneza mphamvu yogwiritsira ntchito mphamvu zambiri.

 

Mwachidule, mphamvu ya chipata, kukana ndi zina za MOSFET ndizofunika kwambiri pakugwira ntchito ndi kugwiritsa ntchito kwake, ndipo ziyenera kusankhidwa ndikupangidwa molingana ndi zochitika ndi zofunikira.