Thermal Resistor

The thermistor.

blockType: AcausalFoundation.Electrical.Elements.ThermalResistor

Path in the library:

/Physical Modeling/Fundamental/Electrical/Elements/Thermal Resistor

Description

Block Thermal Resistor It is a thermistor (temperature-dependent resistor). When the temperature at the heat port is , the resistance is:

where

— resistance at nominal temperature ;
— temperature coefficient.

The following equation describes the thermal behavior of the block:

where

— heat flow to the port H;
— parameter value Dissipation factor;
— parameter value Thermal time constant;
— the rate of temperature change;
— current through the resistor.

Variables

Use the parameter group Initial Targets to set the priority and initial target values for the block parameter variables before modeling. For more information, see Configuring physical blocks using target values.

Ports

Conserving

# + — positive terminal
electricity

Details

The electrical port, which is the positive terminal of the resistor.

Program usage name

p

# − — negative terminal
electricity

Details

The electrical port, which is the negative terminal of the resistor.

Program usage name

n

# H — thermal port
warm

Details

The thermal port that determines the temperature of the resistor.

Program usage name

thermal_port

Parameters

# Nominal resistance — resistance at nominal temperature
Ohm | mOhm | kOhm | MOhm | GOhm

Details

The resistance of the thermistor at the nominal temperature. Many specifications specify a resistance at 25°C (298.15 K), which is denoted as R25.

Units	`Ohm` \| `mOhm` \| `kOhm` \| `MOhm` \| `GOhm`
Default value	`1.0 Ohm`
Program usage name	`R_nominal`
Evaluatable	Yes

Details

The temperature at which the nominal resistance was measured.

Units	`K` \| `degC` \| `degF` \| `degR` \| `deltaK` \| `deltadegC` \| `deltadegF` \| `deltadegR`
Default value	`298.15 K`
Program usage name	`T_reference`
Evaluatable	Yes

Details

Ratio in the equation describing resistance as a function of temperature.

Units	`1/K` \| `1/degR` \| `1/deltaK` \| `1/deltadegC` \| `1/deltadegF` \| `1/deltadegR`
Default value	`50e-6 1/K`
Program usage name	`alpha`
Evaluatable	Yes

# Thermal time constant — the description is missing
s | ns | us | ms | min | hr | d

Details

The description is missing.

Units	`s` \| `ns` \| `us` \| `ms` \| `min` \| `hr` \| `d`
Default value	`10.0 s`
Program usage name	`tau`
Evaluatable	Yes

# Dissipation factor — the description is missing
W/K | kW/K

Details

The description is missing.

Units	`W/K` \| `kW/K`
Default value	`1e-3 W/K`
Program usage name	`dissipation_factor`
Evaluatable	Yes