Linear capacitor in electrical systems

Electrical Elements

The Capacitor block models a linear capacitor, described with the following equation:

$$I=C\frac{dV}{dt}$$

where

`I` | Current |

`V` | Voltage |

`C` | Capacitance |

`t` | Time |

The **Series resistance** and **Parallel
conductance** parameters represent small parasitic effects.
The parallel conductance directly across the capacitor can be used
to model dielectric losses, or equivalently leakage current per volt.
The series resistance can be used to represent component effective
series resistance (ESR) or connection resistance. Simulation of some
circuits may require the presence of the small series resistance.
For more information, see Modeling Best Practices.

Connections + and – are conserving electrical ports corresponding
to the positive and negative terminals of the capacitor, respectively.
The current is positive if it flows from positive to negative, and
the voltage across the capacitor is equal to the difference between
the voltage at the positive and the negative terminal, *V*(+)
– *V*(–).

**Capacitance**Capacitance, in farads. The default value is

`1`

µF.**Series resistance**Represents small parasitic effects. The series resistance can be used to represent component internal resistance. Simulation of some circuits may require the presence of the small series resistance. The default value is

`1`

µΩ.**Parallel conductance**Represents small parasitic effects. The parallel conductance directly across the capacitor can be used to model leakage current per volt. The default value is

`0`

.

Use the **Variables** tab 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.

The block has the following ports:

`+`

Electrical conserving port associated with the capacitor positive terminal.

`-`

Electrical conserving port associated with the capacitor negative terminal.

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