Nonlinear capacitor - QuickField simulation example
This is an example of the nonlinear electrical simulation, performed with QuickField software.
How to find capacitance versus voltage in nonlinear capacitor?
Engineering answer Typical applications Geometry
Nonlinear capacitor consists of 15 metal plates insulated by nonlinear dielectric material.
Given
Task Solution Results
Engineering question
Set up an axisymmetric QuickField Transient Electric problem for a nonlinear capacitor and evaluate capacitance versus voltage from computed field results.
nonlinear dielectric capacitors, varactor devices, voltage-controlled capacitors
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Simulation problem
Problem Type
Axisymmetric problem of transient electric.
Voltage V0 = 0.. 240 V.
Relative permittivity ε of dielectric material - nonlinear.
Calculate C(V) curve.
To calculate C(V) curve we should make a set of experiments: change the voltage and measure the emergy W. The capacitance is C = 2*W / V².
To automate the task lets apply the time-dependent voltage V(t) = Vmax*t, where t - is time. Thus we replace the series of problems with one time-dependent problem. After the problem is solved QuickField can calculate Energy(t) automatically.
Calculated nonlinear capacitor characteristics C(V).
At nominal voltage (240 V) capacitance is C = 1.05 uF.
Maximal capacitance (at 72 V) is C = 1.64 uF.
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