Power semiconductor driver circuit ndi gawo lofunikira la mabwalo ophatikizika, amphamvu, omwe amagwiritsidwa ntchito pa IGBT dalaivala ICs kuwonjezera pakupereka mulingo wagalimoto komanso wapano, nthawi zambiri ndi ntchito zoteteza pagalimoto, kuphatikiza chitetezo chafupipafupi, kutsekeka kwamagetsi, Miller clamp, kutseka kwamagawo awiri. , kutsekedwa kofewa, SRC (kuwongolera mlingo wopha), etc. Zogulitsazo zimakhalanso ndi magawo osiyanasiyana a ntchito zotsekemera.Komabe, monga gawo lophatikizika, phukusi lake limatsimikizira kuchuluka kwamphamvu kwamagetsi, dalaivala IC linanena bungwe panopa akhoza kukhala oposa 10A nthawi zina, koma sangathe kukwaniritsa zoyendetsa galimoto mkulu panopa IGBT modules, pepala ili kukambirana IGBT galimoto. kukula kwamakono ndi kwamakono.
Momwe mungakulitsire driver pano
Pamene galimoto yamakono ikufunika kuwonjezeka, kapena pamene mukuyendetsa IGBTs ndi mphamvu zamakono komanso zazikulu zachipata, m'pofunika kukulitsa zamakono kwa dalaivala IC.
Kugwiritsa ntchito bipolar transistors
Mapangidwe amtundu wa IGBT gate driver ndikuzindikira kukula komwe kulipo pogwiritsa ntchito complementer emitter follower.Kutulutsa kwaposachedwa kwa emitter follower transistor kumatsimikiziridwa ndi kupindula kwa DC kwa transistor hFE kapena β ndi maziko apano IB, pomwe zomwe zikufunika kuyendetsa IGBT ndizokulirapo kuposa IB * β, ndiye kuti transistor idzalowa m'malo ogwirira ntchito ndi zotuluka. Kuyendetsa panopa sikukwanira, ndiye kuti kuthamanga ndi kutulutsa kwa IGBT capacitor kudzakhala kocheperako ndipo kutayika kwa IGBT kumawonjezeka.
Kugwiritsa ntchito MOSFETs
Ma MOSFET atha kugwiritsidwanso ntchito pakukulitsa kwaposachedwa kwa dalaivala, derali nthawi zambiri limapangidwa ndi PMOS + NMOS, koma mulingo wamalingaliro ozungulira ndi wosiyana ndi kukoka kwa transistor.Mapangidwe a gwero lapamwamba la chubu la PMOS amalumikizidwa ndi magetsi abwino, chipata ndi chotsika kuposa gwero lamagetsi operekedwa ndi PMOS, ndipo kutulutsa kwa IC kwa driver nthawi zambiri kumakhala kuyatsa kwakukulu, kotero kugwiritsa ntchito PMOS + NMOS angafunike inverter mu kapangidwe.
Ndi bipolar transistors kapena MOSFETs?
(1) Kusiyanasiyana kwa magwiridwe antchito, nthawi zambiri pamapulogalamu apamwamba kwambiri, ma frequency osinthira siwokwera kwambiri, chifukwa chake kutayika kwa conduction ndikofunikira, pomwe transistor ili ndi mwayi.Mapangidwe ambiri amakono amphamvu kwambiri, monga ma drive amagetsi amagetsi, komwe kutentha kumakhala kovuta komanso kutentha kumakhala kokulirapo mkati mwazotsekeredwa, pomwe kuchita bwino ndikofunikira kwambiri ndipo ma transistor amatha kusankhidwa.
(2) Kutulutsa kwa njira ya bipolar transistor kumakhala ndi kutsika kwamagetsi komwe kumachitika chifukwa cha VCE(sat), magetsi operekera akuyenera kuonjezedwa kuti alipirire chubu choyendetsa VCE(sat) kuti akwaniritse voteji ya 15V, pomwe njira ya MOSFET akhoza pafupifupi kukwaniritsa kutulutsa kwa njanji kupita ku njanji.
(3) MOSFET kupirira voteji, VGS kokha za 20V, amene angakhale vuto limene likufunika chisamaliro pamene ntchito zabwino ndi zoipa magetsi.
(4) Ma MOSFET ali ndi kutentha kwapakati kwa Rds (pa), pamene bipolar transistors ali ndi kutentha kwabwino, ndipo MOSFETs ali ndi vuto lothawirako la kutentha pamene agwirizanitsidwa mofanana.
(5) Ngati kuyendetsa Si / SiC MOSFETs, kuthamanga kwa bipolar transistors nthawi zambiri kumakhala kocheperapo kusiyana ndi chinthu choyendetsa MOSFETs, chomwe chiyenera kuganiziridwa kuti chimagwiritsa ntchito MOSFET kuti chiwonjezeke panopa.
(6) Kulimba kwa gawo lolowera ku ESD ndi voltage yowonjezera, bipolar transistor PN junction ili ndi mwayi waukulu poyerekeza ndi MOS gate oxide.
Bipolar transistors ndi mawonekedwe a MOSFET sali ofanana, zomwe mungagwiritse ntchito kapena muyenera kusankha nokha molingana ndi zofunikira za kapangidwe kake.
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