Ntchito ya Thermistor

1. Thermistor ndi resistor yopangidwa ndi zinthu zapadera, ndipo mtengo wake wotsutsa umasintha ndi kutentha. Malinga ndi coefficient yosiyana ya kusintha kwa kukana, ma thermistors amagawidwa m'magulu awiri:

Mtundu umodzi umatchedwa positive temperature coefficient thermistor (PTC), amene kukana kwake kumawonjezeka ndi kutentha;

Mtundu winawo umatchedwa Negative Temperature Coefficient Thermistor (NTC), yomwe mtengo wake wokana umachepa ndi kutentha kowonjezereka.

2. Thermistor ntchito mfundo

1) Positive kutentha coefficient thermistor (PTC)

PTC nthawi zambiri imapangidwa ndi titanate ya barium monga chinthu chachikulu, ndipo zinthu zochepa zapadziko lapansi zimawonjezeredwa ku barium titanate, ndipo zimapangidwa ndi kutentha kwambiri. Barium titanate ndi polycrystalline zakuthupi. Pali mawonekedwe a kristalo pakati pa kristalo wamkati ndi kristalo. Pamene kutentha ndi otsika, ma elekitironi conductive mosavuta kuwoloka mawonekedwe tinthu chifukwa cha mkati magetsi munda. Panthawiyi, mtengo wake wokana udzakhala wocheperako. Kutentha kukakwera, gawo lamagetsi lamkati lidzawonongedwa, zimakhala zovuta kuti ma elekitironi a conductive awoloke mawonekedwe a tinthu, ndipo mtengo wotsutsa udzauka panthawiyi.

2) Negative kutentha coefficient thermistor (NTC)

NTC nthawi zambiri imapangidwa ndi zitsulo za oxide oxide monga cobalt oxide ndi nickel oxide. Mtundu uwu wa okusayidi wachitsulo uli ndi ma elekitironi ochepa ndi mabowo, ndipo mtengo wake wokana udzakhala wapamwamba. Kutentha kukakwera, chiwerengero cha ma electron ndi mabowo mkati chidzawonjezeka ndipo mtengo wotsutsa udzachepa.

3. Ubwino wa thermistor

Kutengeka kwakukulu, kutentha kwa kutentha kwa thermistor kumakhala kokulirapo kuposa 10-100 kuposa chitsulo, ndipo kumatha kuzindikira kusintha kwa kutentha kwa 10-6 ℃; osiyanasiyana kutentha ntchito osiyanasiyana, yachibadwa zipangizo kutentha ndi oyenera -55 ℃ ~ 315 ℃, zipangizo kutentha ndi oyenera kutentha Pamwamba pa 315 ℃ (pakali pano apamwamba akhoza kufika 2000 ℃), chipangizo otsika kutentha ndi oyenera -273 ℃ ~ -55 ℃; ndi yaying’ono kukula kwake ndipo imatha kuyeza kutentha kwa malo amene ma thermometer ena sangathe kuyeza

4. Kugwiritsa ntchito thermistor

Kugwiritsa ntchito kwakukulu kwa chotenthetsera kumakhala ngati chinthu chozindikira kutentha, ndipo kuzindikira kutentha nthawi zambiri kumagwiritsa ntchito chotenthetsera chokhala ndi choyezera choyipa cha kutentha, ndiko kuti, NTC. Mwachitsanzo, zida zapakhomo zomwe zimagwiritsidwa ntchito nthawi zambiri, monga zophikira mpunga, zophikira m'nyumba, ndi zina zotere, zonse zimagwiritsa ntchito zotenthetsera.