PLECS 1.3 Online Help

Variable Capacitor

Purpose

Variable capacitor.

Library

Nonlinear

Description

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This component models a variable capacitor. The capacitance is determined by the continuous signal fed into the input of the component. The current through a variable capacitance is determined by the equation

   d          d          d
i =--(C   v) =--C   v + C   --v
   dt        dt          dt

Therefore, the control signal is a vector twice as wide as the width of the component. It contains both the momentary capacitance values and their derivatives with respect to time: 
C1 C2 :::Cn ddtC1 ddtC2::: ddtCn. It is the responsibility of the user to provide the correct derivatives.


Note 


Parameters and Dialog Box

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Width
The width of the electrical ports resp. the number of variable capacitors represented by the component.
Initial voltage
The initial voltage of the capacitor at simulation start, in volts (V). This parameter may either be a scalar or a vector with the width of the component. The positive pole is marked with a "+". The initial voltage default is 0.

Probe Signals

Capacitor voltage
The voltage measured across the capacitor. A positive voltage is measured when the potential at the terminal marked with "+" is greater than the potential at the unmarked terminal.