# Discussion Forum

## How to use AC excitation?

 Topics: different physics, Voltage Source
RSS feed   |   Turn on email notifications   |   6 Replies   Last post: January 21, 2013 5:55am UTC

Jiujiang Wang

January 11, 2013 4:47am UTC

How to use AC excitation?

Hello, my name is Wang Jiujiang from University of Macau.
I am using COMSOL to simulate a capacitor, after I simulated
using DC voltage, I want to add AC voltage.

After I add a physics--circuit and then 'voltage source', I cann't
add the source to the driving voltage of capacitor.

Can anyone give me some hints for this problem?

Thanks !

Wang Jiujiang

Eric Lämmel

January 11, 2013 8:10am UTC in response to Jiujiang Wang

Re: How to use parameters between different physics?

Hi,

use a frequency domain study! This equals an AC exciatation.

Jiujiang Wang

January 14, 2013 3:08am UTC in response to Eric Lämmel

Re: How to use parameters between different physics?

Thanks! Eric!

I'll try.

Jiujiang Wang

January 18, 2013 3:35am UTC in response to Eric Lämmel

Re: How to use parameters between different physics?

Hi,

use a frequency domain study! This equals an AC exciatation.

Maybe there is something wrong in my model, I am still trying. >>>>>>>>

Eric Lämmel

January 18, 2013 8:28am UTC in response to Jiujiang Wang

Re: How to use parameters between different physics?

Can you provide an equation of your excitation voltage?

Is it purely AC like u(t)=u_0*sin(2*pi*t/T)

or DC superposed with AC like u(t)=u_DC+u_0*sin(2*pi*t/T)

Jiujiang Wang

January 19, 2013 2:10am UTC in response to Eric Lämmel

Re: How to use parameters between different physics?

I'll try it in Monday.

Happy weekend!

Wang Jiujiang

Jiujiang Wang

January 21, 2013 5:55am UTC in response to Eric Lämmel

Re: How to use parameters between different physics?

Can you provide an equation of your excitation voltage?

Is it purely AC like u(t)=u_0*sin(2*pi*t/T)

or DC superposed with AC like u(t)=u_DC+u_0*sin(2*pi*t/T)

Hello, Eric:

Thanks very much!

Just as you told me. I can add AC signal now!

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