Variable Resistor
Linear variable resistor.
blockType: AcausalFoundation.Electrical.Elements.VariableResistor
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Path in the library: |
Description
Block Variable Resistor simulates a linear variable resistor described by the following equation:
where
-
— tension;
-
— current;
-
— resistance, that is, the value of the signal on the control port R.
The + and − connections are electrical ports corresponding to the positive and negative terminals of the resistor, respectively. Port R is the input port of the scalar signal, which sets the resistance value. The current is positive if it flows from the positive terminal to the negative one, and the voltage across the resistor is equal to the potential difference between the positive and negative terminals. .
The additional thermal port H allows you to connect the resistor to the heating network. To open the thermal port, check the box Enable thermal port and specify the heat capacity of the resistor using the parameter Thermal mass. You can also specify the initial value of a variable. Temperature. The block does not simulate other effects, such as resistance variation depending on temperature.
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 |
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#
−
—
negative terminal
electricity
Details
The electrical port, which is the negative terminal of the resistor.
| Program usage name |
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#
H
—
thermal port
heat
Details
Thermal port that determines the temperature of the resistor.
Dependencies
To enable this port, check the box Enable thermal port.
| Program usage name |
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Input
#
R
—
resistance value signal
scalar
Details
The input port that determines the resistance value.
| Data types |
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| Complex numbers support |
I don’t |
Parameters
Parameters
#
Minimum resistance R>=0 —
minimum allowable resistance
Ohm | mOhm | kOhm | MOhm | GOhm
Details
The minimum resistance value. If the input signal drops below this level (for example, it becomes negative), then this minimum value is used. The parameter value must be non-negative.
| Units |
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| Default value |
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| Program usage name |
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| Evaluatable |
Yes |
# Enable thermal port — turning on the heat port
Details
When this checkbox is selected, the thermal port H is displayed, which allows you to connect the resistor to the heating network. Checking this box also enables the option Thermal mass and adds a variable Temperature to the section Initial Targets.
| Default value |
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| Program usage name |
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| Evaluatable |
No |
#
Thermal mass —
heat capacity of the resistor
J/K | kJ/K
Details
The heat capacity of the resistor.
Dependencies
To enable this option, check the box Enable thermal port.
| Units |
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| Default value |
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| Program usage name |
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| Evaluatable |
Yes |