Lub thermistor yog qhov kub thiab txias -sensitive resistor, uas feem ntau yog ua los ntawm cov khoom siv semiconductor, thiab nws kuj hloov pauv thaum kub hloov.
(1) Qhov tshwm sim ntawm thermistor (2) Hom thermistor
Muaj ntau ntau hom thermistor, uas feem ntau tuaj yeem muab faib ua qhov zoo ntawm qhov kub thiab txias coefficient thermistor (PTC) thiab qhov kub tsis zoo coefficient thermistor (NTC).
① Negative temperature coefficient thermistor, referred to as NTC, its resistance decreases with the increase of temperature. NTC is made of metal oxides such as manganese oxide, cobalt oxide, nickel oxide, copper oxide and aluminum oxide as the main raw materials. According to different operating temperature conditions, NTC thermistors can be divided into three types: low temperature (-60～300℃), medium temperature (300～600℃) and high temperature (>600 degree). Raws li kev ua haujlwm, nws tau muab faib ua plaub hom: hom fais fab, hom nyiaj them, hom ntsuas kub thiab ntsuas kub.
Txhua lub sij hawm qhov kub ntawm NTC nce los ntawm 1 degree, tus nqi kuj yuav txo los ntawm 2 feem pua rau 6 feem pua, thiab cov degree ntawm kev tsis kam txo yog nyob ntawm cov qauv sib txawv. NTC yog dav siv nyob rau hauv qhov kub thiab txias tsis siv neeg tswj circuits, xws li cov tub yees, cua txias, tsev cog khoom thiab lwm yam kub tswj systems feem ntau siv NTC raws li ntsuas kub Cheebtsam.
② Positive temperature coefficient thermistor is referred to as PTC, and its resistance value increases with the increase of temperature. PTC is made of barium titanate (BaTiO2) doped with an appropriate amount of rare earth elements.
PTC tuaj yeem muab faib ua hom qeeb thiab hloov hom. Qhov tsis kam ntawm qhov qeeb {{0}} hom PTC nce los ntawm 0.5 feem pua rau 8 feem pua rau txhua 1 degree qhov kub thiab txias. Kev hloov PTC muaj qhov hloov pauv kub (tseem hu ua Curie point kub, Curie point kub ntawm barium titanate khoom PTC feem ntau yog li 120 degree), thaum qhov kub thiab txias qis dua Curie point kub, tus nqi kuj me me. , thiab qhov kub thiab txias hloov Thaum tus nqi kuj tseem tsis tau hloov pauv (sib npaug rau lub kaw lus kaw), thaum qhov kub siab tshaj qhov Curie point kub, tus nqi kuj yuav nce siab (sib npaug rau qhov hloov tau muab tua).
Slow- hom PTC feem ntau yog siv nyob rau hauv qhov kub thiab txias circuits. Hloov- hom PTC feem ntau yog siv hauv circuits uas tau qhib thaum lub sijhawm pib thiab tom qab ntawd txiav tawm tam sim ntawd, xws li degaussing circuits ntawm cov xim TV, compressor startup circuits ntawm tub yees, thiab overcurrent thiab overheating tiv thaiv. Lub Circuit Court siv hloov PTC.
