Zero Power Resistance Tus nqi RT (Ω)
RT yog hais txog tus nqi tiv thaiv ntsuas ntawm qhov ntsuas kub T siv lub zog ntsuas uas ua rau muaj kev hloov pauv tsis txaus ntseeg ntawm tus nqi tiv thaiv uas cuam tshuam rau tag nrho kev ntsuas yuam kev.
Kev sib raug zoo ntawm tus nqi kuj thiab qhov kub thiab txias ntawm cov khoom siv hluav taws xob yog raws li hauv qab no:
RT = RN expB(1/T – 1/TN)
RT: NTC thermistor tsis kam ntawm qhov kub thiab txias T (K).
RN: NTC thermistor tsis kam ntawm qhov ntsuas kub TN (K).
T: Qhov ntsuas kub (K).
B: Cov khoom tsis tu ncua ntawm NTC thermistor, tseem hu ua thermal rhiab heev index.
exp: exponent raws li tus naj npawb e (e = 2.71828…).
Cov kev sib raug zoo yog empirical thiab muaj ib tug degree ntawm qhov tseeb tsuas yog nyob rau hauv ib tug txwv ntau yam ntawm rated kub TN los yog rated kuj RN, vim hais tias cov khoom tas li B yog nws tus kheej muaj nuj nqi ntawm kub T.
Rated Zero Fais Fab Resistance R25 (Ω)
Raws li lub teb chaws tus qauv, tus nqi pes tsawg lub zog tsis kam yog tus nqi tsis kam R25 ntsuas los ntawm NTC thermistor ntawm qhov ntsuas kub ntawm 25 ℃. Tus nqi tiv thaiv no yog tus nqi nominal tsis kam ntawm NTC thermistor. Feem ntau hais tias NTC thermistor ntau npaum li cas tiv thaiv tus nqi, kuj yog hais txog tus nqi.
Material Constant (thermal rhiab heev index) B tus nqi (K)
B tus nqi yog txhais raws li:
RT1: Zero zog tsis kam ntawm qhov kub thiab txias T1 (K).
RT2: Zero zog tsis kam tus nqi ntawm qhov kub thiab txias T2 (K).
T1, T2: Ob qhov ntsuas kub (K).
Rau cov NTC thermistors, B tus nqi yog li ntawm 2000K txog 6000K.
Zero Power Resistance Temperature Coefficient (αT)
Qhov piv ntawm cov txheeb ze hloov pauv hauv xoom-lub zog tsis kam ntawm NTC thermistor ntawm qhov ntsuas kub ntawm qhov ntsuas kub ntawm qhov hloov pauv uas ua rau muaj kev hloov pauv.
αT: xoom fais fab tsis kam kub coefficient ntawm qhov kub thiab txias T (K).
RT: Zero zog kuj tus nqi ntawm qhov kub thiab txias T (K).
T: Kub (T).
B: Cov khoom tsis tu ncua.
Dissipation Coefficient (δ)
Ntawm qhov ntsuas kub ib puag ncig, qhov sib faib coefficient ntawm NTC thermistor yog qhov piv ntawm lub zog dissipated nyob rau hauv lub resistor mus rau qhov sib thooj kub hloov ntawm tus resistor.
δ: dissipation coefficient ntawm NTC thermistor, (mW / K).
△ P: Lub zog siv los ntawm NTC thermistor (mW).
△ T: NTC thermistor siv lub zog △ P, qhov hloov pauv kub ntawm lub cev resistor (K).
Thermal Time Constant of Electronic Cheebtsam (τ)
Nyob rau hauv xoom hwj chim tej yam kev mob, thaum lub kub hloov sai sai, lub thermistor kub hloov lub sij hawm yuav tsum tau rau 63.2% ntawm thawj ob kub sib txawv. Lub sij hawm thermal tas li yog proportional rau lub peev xwm kub ntawm NTC thermistor thiab inversely proportional rau nws dissipation coefficient.
τ : thermal lub sij hawm tas li (S).
C: Thaum tshav kub kub muaj peev xwm ntawm NTC thermistor.
δ: dissipation coefficient ntawm NTC thermistor.
Rated zog Pn
Kev tso cai siv hluav taws xob ntawm lub thermistor hauv kev ua haujlwm tas mus li ntev raws li cov txheej txheem kev cai. Nyob rau hauv lub hwj chim no, lub cev tiv thaiv kub tsis tshaj nws qhov siab tshaj plaws kev khiav hauj lwm kub.
Ua haujlwm kub siab tshaj plawsTmax: qhov kub siab tshaj plaws uas thermistor tuaj yeem ua haujlwm tsis tu ncua rau lub sijhawm ntev raws li cov txheej txheem kev cai. Ntawd yog, T0- ambient kub.
Cov khoom siv hluav taws xob ntsuas hluav taws xob Pm
Ntawm qhov ntsuas qhov ntsuas kub ib puag ncig, tus nqi tsis kam ntawm lub cev tsis kam ua kom sov los ntawm kev ntsuas tam sim no tuaj yeem tsis quav ntsej txog qhov ua yuam kev tag nrho. Nws yog feem ntau yuav tsum tau hais tias qhov kev hloov pauv tus nqi yog ntau dua 0.1%.
Post lub sij hawm: Mar-29-2023