Nzira yekuziva sei kana MOSFET yakanaka kana yakaipa?

Pane nzira mbiri dzekutaura mutsauko pakati peyakanaka uye yakaipa MOSFET:
Chekutanga: qualitatively siyanisa zvakanakira nezvayakaipiraMOSFETs

Kutanga shandisa multimeter R × 10kΩ block (yakaiswa 9V kana 15V rechargeable bhatiri), iyo inegetive peni (dema) yakabatana negedhi (G), iyo yakanaka peni (tsvuku) yakabatana kune kwainosuka (S). Kugedhi, kwakabva bhatiri repakati, ipapoiyo multimeter tsono ine kutsauka zvishoma. Wobva wachinja kune multimeter R × 1Ω block,izvo zvisina kunaka peni kumugero (D), peni yakanaka kune sosi (S), iyo multimeter yakanyorwa kukosha kana vashoma ohm amai, inoratidza kuti MOSFET yakanaka.

Nzira yekuziva sei kana MOSFET yakanaka kana yakaipa

Yechipiri: nekugadzirisa chiyero chemagetsi ejonction MOSFETsIyo multimeter ichadaidzwa kuR × 100 faira, peni dzvuku yakabatana netsoka chubhu, peni dema yakabatana kune imwe tsoka chubhu, kuitira kuti tsoka yechitatu yakarembera mumhepo. Kana iwe ukaona kuti tsono ine kuzununguka zvishoma, inosimbiswa kuti tsoka yechitatu yegedhi. Kuti uwane kutarisisa kwakakosha kwemhedzisiro chaiyo, asiwo yemagetsi vibration padhuze kana nemunwe kubata kwakarembera mumhepo tsoka, kungoona tsono yekutsauka kukuru, kureva, zvichiratidza kuti kurembera mumhepo tsoka ndiro gedhi. , mamwe makumbo maviri ndimo maibva nekuyerera.

Zvikonzero Zvinosiyanisa:

Kupokana kweJFET kunopfuura 100MΩ, uye transconductance yakakwira zvakanyanya, apo gedhi rinotungamira mukati menzvimbo yemagineti iri nyore kwazvo kukwevera magineti yekushanda voltage data chiratidzo pagedhi, kuti pombi iite kunge iri kusvika, kana kutarisisa. kuva on-off. Kana iyo induction voltage yemuviri inokurumidza kuwedzerwa kugedhi, nekuti kiyi yemagetsi kupindira kwakasimba, mamiriro ari pamusoro anowedzera uye akakosha. Kana tsono yemamita kuruboshwe kwekutsauka kukuru, pachinzvimbo chepombi inoita senge, drain-source resistor RDS kuwedzera, drain-source ikozvino huwandu hwakaderedzwa IDS. pane zvinopesana, tsono yemamita kurudyi rwekutsauka kukuru, zvichiratidza kuti pombi inogara ichidzima, RDS ↓, IDS ↑. Nekudaro, iyo mita tsono kumagumo kune iyo nzira yekutsauka, inofanirwa kuenderana neakanaka uye asina kunaka matanda eiyo induced voltage (yakanaka nzira yevoltage yekushanda kana reverse direction yevoltage yekushanda) uye nzvimbo yekushandisa yepombi yesimbi.
Caveats:
(1) Kuedza kunoratidza kuti kana maoko ese ari maviri akadzivirirwa kubva kuD uye S matanda uye chete gedhi rinobatwa, tsono inowanzo tsauka kuruboshwe. Zvisinei, kana maoko ose ari maviri achibata imwe neimwe yeD, S-pole, uye neminwe inobata gedhi, zvinokwanisika kuona kutsauswa kwetsono kurudyi. Chinokonzeresa muviri wenhamba yezvinzvimbo uye zvinopikisa paMOSFET ine referensi point effect, kuti ipinde munzvimbo yesaturation state.