Induktorite juhtimine väljatransistori abil31. Oct '13

Sissejuhatus

Väljatransistor (FET või field-effect transistor), on transistori alamliik, mis on disainintud võimalikult kiireks lülitamiseks 1. Väljatransistoreid valmistatakse erinevate tehnoloogiatega, hetkel kõige populaarsemaid on isoleeritud paisuga väljatransistor (MOSFET ehk metal-oxide-semiconductor field-effect transistor) 2.

1

Field-effect transistor - Wikipedia, the free encyclopedia

2

MOSFET - Wikipedia, the free encyclopedia

Väljatransistori lisamine skeemi

Samamoodi nagu tavalisi transistoreid on PNP ja NPN siiretega, on ka väljatransistoreid fundamentaalselt kahte tüüpi. Digitaalsetes skeemides on kõige populaarsemad N-kanali isoleeritud paisuga väljatransistorid. Tüüpilisel väljatransistoril on ka sisseehitatud Zener-i diood mis võimaldab sellega efektiivselt lülitada induktoreid (pool, mootor vms). Zener-i diood paistab ilusti ka välja väljatransistori tingmärgil:

12213121212VInduktor5VLüliti

Väljatransistori vooluringid

Mikokontrolleri külge ühendamine

Väljatransistorist teeb eriti atraktiivse elektroonikakomponendi asjaolu, et Arduino külge ühendades pole tavaliselt ühtegi lisakomponenti vaja:

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Arduino 9. jalaga mootori juhtimine väljatransistori abil

Säärasesse skeemi sobivad näiteks BS170 või IRF520 väljatransistorid.

Arduino Tiigriülikool Estonian IT College