Variable Capacitor

Ideal linear electrical capacitor with variable capacitance

 Description The Variable Capacitor component models a variable, linear electrical capacitor. The input signal $C$ controls the capacitance; it must be greater than ${C}_{\mathrm{min}}$.
 Equations $Q=\mathrm{max}\left(C,{C}_{\mathrm{min}}\right)v$ $i={i}_{p}=-{i}_{n}=\stackrel{.}{Q}$ $v={v}_{p}-{v}_{n}$

Variables

 Name Units Description Modelica ID $i$ $A$ Current flowing from pin p to pin n i ${i}_{x}$ $A$ Current into pin $x$, $x\in \left\{n,p\right\}$ x.i ${i}_{x}$ $A$ Current into pin $x$, $x\in \left\{n,p\right\}$ x.i $Q$ $C$ Charge across capacitor Q $v$ $V$ Voltage drop across the capacitor v ${v}_{x}$ $V$ Voltage at pin $x$, $x\in \left\{n,p\right\}$ x.v ${v}_{x}$ $V$ Voltage at pin $x$, $x\in \left\{n,p\right\}$ x.v

Connections

 Name Description Modelica ID $p$ Positive pin p $n$ Negative pin n $C$ Real input, capacitance in $F$ C

Parameters

 Name Default Units Description Modelica ID ${C}_{\mathrm{min}}$ $1·{10}^{-15}$ $F$ Lower bound for variable capacitance, $0<{C}_{\mathrm{min}} Cmin $\mathrm{IC}$ $0$ $V$ Initial voltage IC $\mathrm{UIC}$ $\mathrm{false}$ True (checked) means use $\mathrm{IC}$ UIC

 Modelica Standard Library The component described in this topic is from the Modelica Standard Library. To view the original documentation, which includes author and copyright information, click here.