Monday, January 3, 2011

【 Weak current College 】 thermistor parameter 】


Rated zero power resistor R25
Zero power resistors, refers to a temperature measurement of PTC thermistor value, plus the PTC thermistor on power consumption is very low, low power consumption due to its cause of the change in resistance of the PTC thermistor is negligible. Rated zero power resistance refers to the ambient temperature of 25 ºc measured zero power resistor values.

Curie temperature Tc

Application for PTC thermistor resistance value for started steeply rising temperature is important, and we define it as a Curie temperature. Curie temperature corresponding PTC thermistor resistance RTc = 2 * Rmin.

Temperature coefficient α

PTC thermistor temperature coefficient is defined as the temperature changes caused by the relative change in resistance. Temperature coefficient, the larger the PTC thermistor temperature response more sensitive. α=(lgR2-lgR1)/lge(T2-T1)

Rated voltage VN

Rated voltage is at the maximum working voltage Vmax following supply voltage. Usually Vmax = VN + 15%

Breakdown voltage VD

Breakdown voltage is the PTC thermistor highest voltage tolerance. PTC thermistor in breakdown voltage breakdown over time will lapse.

Surface temperature Tsurf

Surface temperature Tsurf refers to when the PTC thermistor in the voltage and with the surrounding environment is in a State of thermal equilibrium reached a long time, the PTC thermistor temperature of the surface.

Action current Ik

Current flows through the PTC thermistor, enough to make the PTC thermistor temperature rise since the heat exceeds the Curie temperature, this current is called current. Current minimum value as most small currents.

No current INk

Current flows through the PTC thermistor is insufficient to make PTC thermistor temperature rise since the heat exceeds the Curie temperature, such as non-current current. No current maximum value is called the maximum current.


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