Time varying (voltage controlled) capacitor (LTSpice or PSpice)

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stenzer

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Hi,

I want to make a spice simulation with a time varying capacitor. Is it possibel to do that in LTSpice or PSpice e.g. with a control voltage. As far I know with LTSpice it is just possible to vary the charge. But I have to change the capacitnace and keep the charge constant to simulate an electrostatic energy harvester.

I'm thankful for any advice!!!

BR
 

You can change the capacitance in LTspice using a voltage control but I don't think it will maintain a constant charge in the capacitor as you want.
 

stenzer said:
... change the capacitance and keep the charge constant
Click to expand...

For this you have to use a function of the form C ~ 1/V . Should be possible in PSpice. See the manual.
 

It's surely possible with behavioral sources, similar to the modelling of nonlinear semiconductor capacitance.
 

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