石家莊負(fù)溫度性質(zhì)熱敏電阻，歡迎來(lái)電咨詢(xún)�。�
當(dāng)NTCR熱敏電阻在小電流下工作時(shí)（如圖F），由于功率太底，其電阻保持固定而表現(xiàn)線性關(guān)系（符合歐姆定律V/R=1）。如果電流增加，NTC熱敏電阻就會(huì)產(chǎn)生焦耳效應(yīng)(P =V×1)而使自己發(fā)熱，其電阻值隨即減小表現(xiàn)「電流增加,電壓下降」的狀態(tài)。石家莊負(fù)溫度性質(zhì)熱敏電阻When operating low current (see fig.F), due to very low power is unable to make the NTC thermistor self-heated, so its resistance value is thus maintained constant and displayed with a linear curve (in conformity with ohm-law V/R=1).If the current is increased, the NTC thermistor will follow Joule-efficiency(P= V×1) and make itself self-heated that results in a resistace value decreasing and thus displays with a status of voltage descending while current increased.
石家莊負(fù)溫度性質(zhì)熱敏電阻說(shuō)明NTC元件與環(huán)境達(dá)成熱平衡所需的時(shí)間，主要決定于材料熱容量（G）及散熱系數(shù)（δ）。當(dāng)元件溫度由T1降到T0，則可得到下列平衡式：－HdT=δ(T－T0)dt 其中－HdT=元件熱損失δ(T－T0)dt:元件散熱量積分后可得溫度與時(shí)間關(guān)系式T－T1= (T0－T1)×e－t/t其中τ=H/δ石家莊負(fù)溫度性質(zhì)熱敏電阻 |
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