Ungasarudza sei MOSFET?

Kune marudzi maviri eMOSFETs, N-channel uye P-channel. Mumagetsi masisitimu,MOSFETsinogona kutorwa semagetsi emagetsi. Iyo switch yeN-channel MOSFET inoitisa kana yakanaka voltage yawedzerwa pakati pegedhi nekwakabva. Paunenge uchiitisa, ikozvino inogona kuyerera kuburikidza nekuchinja kubva kudhiraini kuenda kune kwainosuka. Pane kupokana kwemukati pakati pedhiri uye sosi inonzi on-resistance RDS(ON).

 

MOSFET sechinhu chakakosha chemagetsi sisitimu, Guanhua Weiye inokuudza maitiro ekuita sarudzo chaiyo zvinoenderana nemaparamita?

I. Kusarudzwa kweChannel

Nhanho yekutanga pakusarudza mudziyo wakakodzera wedhizaini yako ndeyekuona kuti woshandisa N-channel kana P-channel MOSFET. mumashandisirwo emagetsi, MOSFET inodzikwa pasi uye mutoro unobatanidzwa kune trunk voltage apo MOSFET inoumba yakaderera-voltage side switch. N-channel MOSFETs inofanirwa kushandiswa mu low voltage side switching nekuda kwekufunga nezve voltage inodiwa kudzima kana kubatidza mudziyo. High voltage side switching inofanirwa kushandiswa kana MOSFET yakabatana nebhazi uye kurodha pasi yekubatanidza.

 

II. Kusarudza Voltage uye Iyezvino

Iyo yakakwirira yevoltage yakayerwa, iyo inowedzera mutengo wemudziyo. Zvinoenderana neruzivo runoshanda, iyo yakatemerwa voltage inofanirwa kuve yakakura kupfuura yetrunk voltage kana bhazi voltage. Ipapo ndipo chete inogona kupa dziviriro yakakwana kubva kuMOSFET kutadza. Paunenge uchisarudza MOSFET, iyo yakakwira voltage kubva pakudonhedza kune sosi inoda kutariswa.

Mukuenderera mberi conduction mode, iyoMOSFETiri muchimiro chakadzikama, kana ikozvino ichifamba ichipfuura nemumudziyo. Mapulse spikes ndeapo paine masurges makuru (kana peak currents) anoyerera nemumudziyo. Kana iyo yakanyanya ikozvino yakatemwa pasi pemamiriro ezvinhu aya, ingosarudza mudziyo unogona kutsungirira yakanyanya ikozvino.

 

Chechitatu, conduction kurasikirwa

Nekuti iyo on-resistance inosiyana netembiricha, kurasikirwa kwemagetsi kuchasiyana zvakaenzana. Kune inotakurika dhizaini, kushandiswa kweiyo yakaderera voltage kwakajairika, nepo kumaindasitiri dhizaini, yakakwira voltage inogona kushandiswa.

 

System Thermal Zvinodiwa

Nezve system inotonhorera zvinodiwa, Crown Worldwide inokuyeuchidza kuti kune maviri akasiyana mamiriro anofanirwa kutariswa, yakaipisisa nyaya uye mamiriro chaiwo. Shandisa iyo yakaipisisa-kesi kuverenga nekuti iyi mhedzisiro inopa yakakura muganho wekuchengetedza uye inogona kuvimbisa kuti sisitimu haikundike.

TheMOSFETiri kutsiva zvishoma nezvishoma matatu mumaseketi akabatanidzwa nekuda kwekushandisa kwayo kushoma kwesimba, kuita kwakagadzikana, uye kushomeka kwemwaranzi. Asi ichiri yakatetepa, uye kunyangwe mazhinji acho atove neakavakirwa-mukati ekudzivirira diode, anogona kukuvadzwa kana kuchengetwa kukasatorwa. Naizvozvo, zvakanakisa kuda kungwarira mukushandisa zvakare.