Model NTC thermistor using B-parameter equation
The Thermistor block represents an NTC thermistor using the B-parameter equation. The resistance at temperature T is
R0 is the nominal resistance at the reference temperature T0.
B is the characteristic temperature constant.
The following equation describes the thermal behavior of the block:
Q is the net heat flow into port A.
Kd is the Dissipation factor parameter value.
tc is the Thermal time constant parameter value.
dT/dt is the rate of change of the temperature.
To model the thermistor in free space:
Connect the thermistor to the B port of a Simscape™ Convective Heat Transfer block.
Connect the A port of the Convective Heat Transfer block to a Simscape Ideal Temperature Source block whose temperature is set to the ambient temperature.
Set the Area parameter of the Convective Heat Transfer block to an approximate area Anom.
Set the Heat transfer coefficient parameter of the Convective Heat Transfer block to Kd/Anom.
Use the Variables section of the block interface to set the priority and initial target values for the block variables prior to simulation. For more information, see Set Priority and Initial Target for Block Variables (Simscape).
The nominal resistance of the thermistor at the reference temperature.
Many datasheets quote the nominal resistance at 25°C and list
it as R25. The default value is
The coefficient B in the equation that describes
resistance as a function of temperature. The default value is
The temperature at which the nominal resistance was measured.
The default value is
The time it takes the sensor temperature to reach 63% of the
final temperature change when a step change in ambient temperature
occurs. The default value is
The thermal power required to raise the thermistor temperature
by one K. The default value is
The block has the following ports:
Positive electrical port
Negative electrical port