Dera la ntchito ya mosfet

Chofunikira kwambiri chamosfetndi kusintha, kotero chitha kugwiritsidwa ntchito kwambiri m'mabwalo osiyanasiyana omwe amafunikira kusintha kwamagetsi, monga kusintha magetsi ndi mabwalo oyendetsa galimoto. Masiku ano, mosfet ntchito dera dera:

1, otsika voteji ntchito

Pamene ntchito 5V magetsi, ngati chikhalidwe totem mzati ntchito, chifukwa voteji dontho la transistor kukhala pafupifupi 0.7V, voteji weniweni potsiriza yodzaza pachipata ndi 4.3V yekha, pa nthawi ino, ngati tisankha. mosfet yokhala ndi voteji ya 4.5V, dera lonselo lidzakhala ndi chiopsezo china. Vuto lomwelo lidzachitika mukamagwiritsa ntchito 3V kapena magetsi ena otsika.

2, kugwiritsa ntchito magetsi ambiri

M'moyo wathu watsiku ndi tsiku, ma voliyumu omwe timalowetsa simtengo wokhazikika, amakhudzidwa ndi nthawi kapena zinthu zina. Izi zipangitsa kuti dera la pwm lipereke magetsi oyendetsa osakhazikika ku mosfet. Chifukwa chake, kuti mulole ma transistors azitha kugwira ntchito motetezeka pazipata zazikulu, ambirimosfetsmasiku ano ali ndi zowongolera magetsi zomangira zomwe zimachepetsa mphamvu yamagetsi pachipata. Panthawiyi, pamene magetsi oyendetsa galimoto omwe amaperekedwa amaposa voteji ya regulator, kuchuluka kwakukulu kwa mphamvu ya static kumachitika. Nthawi yomweyo, ngati magetsi a pachipata amangochepetsedwa pogwiritsa ntchito mfundo ya resistor voltage divider, voliyumu yolowera idzakhala yokwera kwambiri ndipo mosfet idzagwira ntchito bwino. Mphamvu yolowera ikachepetsedwa, voteji ya pachipata ndi yosakwanira, zomwe zimapangitsa kuti pakhale kusakwanira komanso kugwiritsa ntchito mphamvu zambiri.