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Passive Devices
The Variable Capacitor block represents a linear time-varying capacitor. The current i through the device when the capacitance at port C is C is governed by the following equation:
where v is the
voltage across the capacitor. In the preceding relationship, the capacitance
is defined as the ratio of the charge to the voltage. If the capacitance
is defined as the local gradient of the charge-voltage curve, then
the
term is not required.
The block includes a resistor in series with the variable capacitor. This resistor can be used to represent the total ohmic connection resistance of the capacitor. It may be required to prevent numerical issues for some circuit topologies, such as one where a Variable Capacitor block is connected in parallel with another capacitor block that doesn't have a series resistance.
The lower limit on the value of the signal at port C. This limit prevents the signal from reaching a value that has no physical meaning. The default value is 1e-09 F.
The value of the resistance placed in series with the variable capacitor. The default value is 1e-06 Ω.
The block has the following ports:
Capacitance. C must be finite and greater than zero.
Positive electrical port.
Negative electrical port.
Variable Inductor, Simscape Variable Resistor
| Universal Motor | Variable Inductor | |
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