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    NTC¶ϵ/¶ȴԭ

    ¡޹˾ʱ䣺2022-09-26 13:54
    NTCԭӦ

    NTCָи¶ϵ衣ʹõһߴȲϡнӽܶȽṹĸմɡˣʵСͻͬʱеֵ¶ԲСԸ¶ȱ仯Ӧص㣬ɽиȡ߾ȵļ⡣˾ṩ״ԵС͡߿ɿԲƷͻӦ

    NTC¶ϵ蹤ԭ

    NTCNegativeTemperatureCoefficientд,˼Ǹ¶ϵ,ָ¶ϵܴİ뵼ϻԪνNTCǸ¶ϵ̡ܡͭȽΪҪϣմɹɵġЩ϶а뵼ʣΪڵ緽ʽȫࡢȰ뵼ϡ¶ȵʱЩϵӣӺͿѨĿ٣ֵϸߣ¶ȵߣĿӣԵֵ͡NTCµı仯Χ10O~1000000ŷķ¶ϵ-2%~-6.5%NTCɹ㷺Ӧ¶Ȳ¶Ȳӿȳϡ

    NTC¶ϵרҵ

    㹦ʵֵRTΩ

    RTָڹ涨¶Tʱֵ仯ܵIJ˵ԺԲƵIJʲõĵֵ

    ֵ¶ȱ仯ĹϵʽΪ

    RT=RNexpB(1/T–1/TN)

    RT¶TKʱNTCֵ

    RNڶ¶TNKʱNTCֵ

    T涨¶ȣK

    BNTCIJϳָֽ

    expȻeΪ׵ָe=2.71828…

    ùϵʽǾ鹫ʽֻڶ¶TNֵRN޷ΧڲžһľȷȣΪϳBҲ¶Tĺ

    㹦ʵֵR25Ω

    ݹ涨㹦ʵֵNTCڻ׼¶25ʱõĵֵR25ֵNTCıƵֵͨ˵NTCֵֵָ

    ϳָBֵK

    BֵΪ

    RT1¶T1Kʱ㹦ʵֵ

    RT2¶T2Kʱ㹦ʵֵ

    T1T2ָ¶ȣK

    ڳõNTC裬BֵΧһ2000K6000K֮䡣

    㹦ʵ¶ϵαT

    ڹ涨¶£NTC㶯ʵֵԱ仯ñ仯¶ȱ仯ֵֵ֮

    αT¶TKʱ㹦ʵ¶ϵ

    RT¶TKʱ㹦ʵֵ

    T¶ȣT



    ɢϵδ

    ڹ涨¶£NTCɢϵǵкɢĹʱ仯Ӧ¶ȱ仯ֵ֮

    δNTCɢϵmW/K

    PNTCĵĹʣmW

    TNTCĹʡPʱӦ¶ȱ仯K

    ʱ䳣(τ)

    㹦£¶ͻʱ¶ȱ仯ʼδ¶Ȳ63.2%ʱʱ䣬ʱ䳣NTCȣɢϵɷȡ

    τʱ䳣S

    CNTC

    δNTCĺɢϵ

    Pn

    ڹ涨ļ£ĵĹʡڴ˹£¶Ȳ߹¶ȡ

    ߹¶Tmax

    ڹ涨ļ£ܳ¶ȡ:

    T0-¶ȡ

    Pm

    ڹ涨Ļ¶£ֵܲ仯ܵIJ˵ԺԲʱĵĹʡ

    һҪֵ仯0.1%ʱIJPmΪ



    NTC¶ԿʽƱʾ

    ʽУ

    RT¶Tʱ㹦ʵֵ

    AԼγߴйصϵ

    BBֵ

    T¶ȣk

    ȷıʽΪ

    ʽУRT¶Tʱ㹦ʵֵ

    TΪ¶ֵK

    ABCDΪضij

    ĻԵ裭¶ĵ裭¶ԿɽƵʽ1ʾ

    (ʽ1)R=Roexp{B(I/T-I/To)}

    R

       

    :¶T(K)ʱĵֵ

    Ro

       

    :¶T0(K)ʱĵֵ

    B

       

    :Bֵ

    *T(K)=t(ºC)+273.15

    ʵϣBֵǺ㶨ģ仯СϹɶ죬ɴ5K/°Cڽϴ¶ȷΧӦʽ1ʱʵֵ֮һ

    ˴ʽ1еBֵʽ2ʾΪ¶ȵĺʱɽʵֵ֮Ϊȡ

    (ʽ2)BT=CT2+DT+E

    ʽУCDEΪ

    ⣬ͬɵBֵIJE仯CD䡣ˣ̽BֵIJʱֻ迼dzEɡ

    •CDEļ

    CDE4(¶ȡֵ)(T0,R0).(T1,R1).(T2,R2)and(T3,R3)ͨʽ36㡣

    ʽ3T0T1,T2,T3ĵֵB1,B2,B3,Ȼ¸ʽ

    •ֵ

    Ըݵ裭¶Ա25°CʱĵֵΪ5(kΩ)BֵƫΪ50(K)10°C30°Cĵֵ



    (1)ݵ裭¶ԱCDE

    To=25+273.15T1=10+273.15T2=20+273.15T3=30+273.15(2)BT=CT2+DT+E+50BT

    (3)ֵR=5exp{(BTI/T-I/298.15)}R

    *T:10+273.1530+273.15

    •裭¶ͼͼ1ʾ

    ¶ϵν¶ϵ(α)ָ¶¶ȱ仯1°C(K)ʱ㸺ص仯ʡ¶ϵ(α)BֵĹϵɽʽ1΢ֵõ

    αǰĸ()ʾ¶ʱ㸺ص轵͡

    ɢϵ(JIS-C2570)ɢϵ(δ)ָƽ״̬£Ԫͨʹ¶1°CʱĹʡ

    ƽ״̬£¶T1¶T2ĹP֮ϵʽʾ

    ƷĿ¼ֵΪвⶨµĵֵ

    (1)

       

    25°CֹС

    (2)

       

    šڳ״̬²ⶨ

    (JIS-C2570)ڶ¶£еĹֵ

    ƷĿ¼ֵ25°CΪ¶ȡʽֵ

    (ʽ)=ɢϵ×ʹ¶ȣ25

    йй=t×ɢϵ…(3.3)

    ʹ¶ȼ¶ȲʱȲ¶ֵӦʡ(JISδ塣)¶t°Cʱйʿʽ㡣

    Ӧ¶ȱ仯Ӧʱ䳣(JIS-C2570)ָ㸺״̬£Ļ¶ȷ仯ʱԪ¶¶¶Ȳ63.2%¶ȱ仯ʱ䡣

    Ļ¶ȴT1ΪT2ʱʱt¶T֮¹ϵ

    T=

       

    (T1-T2)exp(-t/τ)+T2......(3.1)

       

    (T2-T1){1-exp(-t/τ)}+T1.....(3.2)

    τӦʱ䳣

    ʽУt=τʱ(T-T1)/(T2-T1)=0.632

    ֮Ķʼ¶Ȳ63.2%¶ȱ仯ʱ伴ΪӦʱ䳣

    ʱ¶ȱ仯ʵĹϵ±ʾ

    ƷĿ¼¼ֵΪвⶨµĵֵ

    (1)

       

    ֹл¶ȴ50°C25°C仯ʱ¶ȱ仯34.2°Cʱ䡣

    (2)

       

    šڳ״̬²ⶨ

    Ӧע⣬ɢϵӦʱ䳣滷¶ȡװ仯

    NTC¶ϵR-T

    BֵֵͬͬR-Tʾͼ

    ֵͬͬBֵNTCR-Tʾͼ

    ¶ȲNTC

    νṹ

    װϵNTC

    װϵNTC

    Ӧõ·ԭͼ

    ¶Ȳ˹ǵŵ·

    ¶ȿ

    Ӧ

    ·¶ȼơ¶ʾƷ

    ·ů豸Ⱥµ

    ·¶Ȳص·

    ·¶ȴ¶DZ

    ·ҽƵ豸ϴ豸

    ·ֻؼ

    ¶ȲNTC

    Ʒ

    뵼ICs¶ϵҪ¶Ȳڽϴ¶ȷΧдﵽȶܵãNTCнϸߵ¶ϵԹ㷺Ӧ¶Ȳ

    Ҫ

    㹦ʵֵR25(Ω)

    R25ƫ%

    Bֵ(25/50)/K

    ʱ䳣≤30S

    ɢϵ≥6mW/

    ≤0.1mW

    ≤0.5W

    ʹ¶ȷΧ-55~+125

    ߣ

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