Kodi mukudziwa MOSFET driver circuit?

Dera la oyendetsa a MOSFET ndi gawo lofunikira kwambiri pamagetsi amagetsi ndi kapangidwe ka dera, lomwe limapereka mwayi wokwanira woyendetsa kuti MOSFET igwire ntchito moyenera komanso modalirika. Zotsatirazi ndikuwunika mwatsatanetsatane mabwalo oyendetsa a MOSFET:

I. Udindo wa dera loyendetsa galimoto

Perekani mphamvu yoyendetsa yokwanira:Popeza chizindikiro choyendetsa nthawi zambiri chimaperekedwa kuchokera kwa wolamulira (mwachitsanzo DSP, microcontroller), magetsi oyendetsa galimoto ndi apano sangakhale okwanira kuyatsa MOSFET mwachindunji, kotero kuti dera loyendetsa galimoto likufunika kuti lifanane ndi kuyendetsa galimoto.

Onetsetsani zinthu zabwino zosinthira:Dera la oyendetsa liyenera kuwonetsetsa kuti ma MOSFET sathamanga kwambiri kapena pang'onopang'ono pakusintha kuti apewe zovuta za EMI komanso kutayika kwakukulu kosintha.

Onetsetsani kudalirika kwa chipangizocho:Chifukwa cha kukhalapo kwa magawo a parasitic a chipangizo chosinthira, ma spikes a voltage-current amatha kupangidwa panthawi ya conduction kapena kuzimitsa, ndipo dera loyendetsa dalaivala liyenera kupondereza ma spikes awa kuti ateteze dera ndi chipangizocho.

II. Mitundu ya ma drive circuits

 

Dalaivala wosadzipatula

Direct Drive:Njira yosavuta yoyendetsera MOSFET ndikulumikiza chizindikiro choyendetsa mwachindunji pachipata cha MOSFET. Njirayi ndi yoyenera pazochitika zomwe kuyendetsa galimoto kuli kokwanira ndipo kufunikira kodzipatula sikuli kwakukulu.

Dera la Bootstrap:Pogwiritsa ntchito mfundo yakuti magetsi a capacitor sangasinthidwe mwadzidzidzi, magetsi amachotsedwa pokhapokha MOSFET ikasintha kusintha kwake, motero kuyendetsa MOSFET yapamwamba kwambiri. driver IC, monga mabwalo a BUCK.

Woyendetsa Wodzipatula

Kudzipatula kwa Optocoupler:Kudzipatula kwa chizindikiro choyendetsa kuchokera kudera lalikulu kumatheka kudzera mwa optocouplers. Optocoupler ali ndi ubwino wa kudzipatula kwa magetsi ndi mphamvu zotsutsana ndi kusokoneza, koma kuyankha pafupipafupi kungakhale kochepa, ndipo moyo ndi kudalirika kungachepetsedwe pansi pa zovuta.

Kudzipatula kwa Transformer:Kugwiritsa ntchito ma transfoma kuti akwaniritse kudzipatula kwa chizindikiro chagalimoto kuchokera kudera lalikulu. Kudzipatula kwa thiransifoma kuli ndi ubwino wa kuyankha kwa maulendo apamwamba kwambiri, voteji yodzipatula kwambiri, ndi zina zotero, koma mapangidwe ake ndi ovuta komanso okhudzidwa ndi magawo a parasitic.

Chachitatu, mapangidwe a malo oyendetsa magalimoto

Mphamvu yamagetsi:Ziyenera kutsimikiziridwa kuti magetsi oyendetsa galimoto ndi apamwamba kuposa magetsi a MOSFET kuti atsimikizire kuti MOSFET ikhoza kuyenda modalirika. Panthawi imodzimodziyo, magetsi oyendetsa galimoto asakhale okwera kwambiri kuti asawononge MOSFET.

Yendetsani panopa:Ngakhale ma MOSFET ndi zida zoyendetsedwa ndi ma voliyumu ndipo safuna kupitilirabe pakali pano, nsonga yaposachedwa iyenera kutsimikiziridwa kuti zitsimikizire kuthamanga kwina. Chifukwa chake, dera loyendetsa dalaivala liyenera kupereka chiwongolero chokwanira chapano.

Drive Resistor:The resistor drive imagwiritsidwa ntchito kuwongolera liwiro losinthira ndikupondereza ma spikes apano. Kusankhidwa kwa mtengo wotsutsa kuyenera kutengera dera lenileni komanso mawonekedwe a MOSFET. Nthawi zambiri, mtengo wotsutsa suyenera kukhala wokulirapo kapena wocheperako kuti upewe kukhudza momwe kuyendetsa galimoto komanso magwiridwe antchito amayendera.

Mapangidwe a PCB:Pamakonzedwe a PCB, kutalika kwa kuyanjanitsa pakati pa dera la dalaivala ndi chipata cha MOSFET kuyenera kufupikitsidwa momwe mungathere, ndipo m'lifupi mwa kugwirizanitsa kuyenera kuwonjezeka kuti muchepetse zotsatira za parasitic inductance ndi kukana pa kuyendetsa galimoto. Panthawi imodzimodziyo, zigawo zazikulu monga zotsutsa zoyendetsa galimoto ziyenera kuikidwa pafupi ndi chipata cha MOSFET.

IV. Zitsanzo za mapulogalamu

Mabwalo oyendetsa a MOSFET amagwiritsidwa ntchito kwambiri pazida zosiyanasiyana zamagetsi zamagetsi ndi mabwalo, monga kusintha magetsi, ma inverters, ndi ma drive amagalimoto. M'mapulogalamuwa, mapangidwe ndi kukhathamiritsa kwa mabwalo oyendetsa galimoto ndizofunikira kwambiri kuti zitheke komanso kudalirika kwa zida.

Mwachidule, MOSFET yoyendetsa dera ndi gawo lofunikira pamagetsi amagetsi ndi kapangidwe ka dera. Popanga mayendedwe oyendetsa bwino, imatha kuwonetsetsa kuti MOSFET imagwira ntchito moyenera komanso modalirika, motero imawongolera magwiridwe antchito ndi kudalirika kwa dera lonselo.