Resistor with thermal port
The Thermal Resistor block represents a temperature-dependent resistor. The resistance when the temperature at the thermal port is T is
R = R0(1+α(T–T0))
R0 is the nominal resistance at the reference temperature T0.
α is the temperature coefficient.
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.
i is the current through the resistor.
Use the Variables tab in the block dialog box (or the Variables section in the block Property Inspector) 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.
In particular, the Initial temperature variable
lets you set a high-priority target for the temperature of the thermal
resistor at the start of the simulation. The default value is
The nominal resistance of the thermistor at the reference temperature.
Many datasheets quote the nominal resistance at 25°C (298.15
K) and list it as R25. The default value is
The temperature at which the nominal resistance was measured.
The default value is
The coefficient α in the equation that
describes resistance as a function of temperature. The default value
The time it takes the resistor 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 thermal resistor temperature
by one K. The default value is
The block has the following ports:
Resistor thermal port
Positive electrical port
Negative electrical port