1. Thermistor yog ib qho resistor ua los ntawm cov khoom tshwj xeeb, thiab nws cov nqi kuj hloov nrog kub. Raws li qhov sib txawv coefficient ntawm kev hloov pauv, thermistor tau muab faib ua ob pawg:
Ib hom yog hu ua qhov zoo kub coefficient thermistor (PTC), nws tus nqi kuj nce nrog kub;
Lwm hom yog hu ua Negative Temperature Coefficient Thermistor (NTC), uas nws tus nqi kuj txo qis nrog nce kub.
2. Thermistor txoj cai ua haujlwm
1) Zoo kub coefficient thermistor (PTC)
PTC feem ntau yog ua los ntawm barium titanate ua cov khoom tseem ceeb, thiab ib qho me me ntawm cov ntsiab lus tsis tshua muaj hauv ntiaj teb tau ntxiv rau barium titanate, thiab nws yog tsim los ntawm kub sintering. Barium titanate yog cov khoom siv polycrystalline. Nws muaj ib tug crystal particle interface ntawm lub sab hauv siv lead ua thiab cov siv lead ua. Thaum qhov kub thiab txias tsis tshua muaj, cov hluav taws xob hluav taws xob tuaj yeem yooj yim hla qhov sib cuam tshuam vim qhov hluav taws xob sab hauv. Lub sijhawm no, nws tus nqi tiv thaiv yuav me dua. Thaum qhov kub thiab txias, qhov hluav taws xob sab hauv yuav raug puas tsuaj, nws yog ib qho nyuaj rau cov conductive electrons hla lub particle interface, thiab tus nqi kuj yuav nce nyob rau lub sij hawm no.
2) Tsis zoo kub coefficient thermistor (NTC)
NTC feem ntau yog ua los ntawm cov khoom siv hlau oxide xws li cobalt oxide thiab npib tsib xee oxide. Hom hlau oxide no muaj tsawg dua electrons thiab qhov, thiab nws cov nqi kuj yuav siab dua. Thaum qhov kub thiab txias, tus naj npawb ntawm cov hluav taws xob thiab qhov hauv sab hauv yuav nce ntxiv thiab tus nqi kuj yuav txo.
3. Qhov zoo ntawm thermistor
rhiab heev, qhov kub coefficient ntawm thermistor yog ntau tshaj 10-100 lub sij hawm loj dua li cov hlau, thiab tuaj yeem kuaj xyuas qhov kub thiab txias ntawm 10-6 ℃; Kev khiav hauj lwm kub ntau yam, cov cuab yeej kub ib txwm tsim nyog rau -55 ℃ ~ 315 ℃, cov cuab yeej kub kub yog tsim rau kub siab tshaj 315 ℃ (tam sim no qhov siab tshaj plaws tuaj yeem ncav cuag 2000 ℃), cov cuab yeej kub qis yog tsim rau -273 ℃ ~ -55 ℃; nws yog qhov me me thiab tuaj yeem ntsuas qhov kub ntawm qhov chaw uas lwm cov ntsuas kub tsis tuaj yeem ntsuas
4. Daim ntawv thov ntawm thermistor
Daim ntawv thov tseem ceeb ntawm lub thermistor yog raws li qhov ntsuas qhov ntsuas kub, thiab qhov ntsuas kub feem ntau yog siv lub thermistor nrog qhov ntsuas kub tsis zoo, uas yog, NTC. Piv txwv li, feem ntau siv cov khoom siv hauv tsev, xws li mov cookers, induction cookers, thiab lwm yam, txhua tus siv thermistors.
Post lub sij hawm: Nov-06-2024