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Adding a DC bias to an AC signal - Electrostatics

Posted Oct 3, 2024, 9:13 a.m. EDT Electromagnetics, General, Physics Interfaces Version 6.1 2 Replies

David Hill
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Hello,

For the sake of my question, lets say I am attempting to calculate an electric field in a very simple geometry (3 plates of equal spacing. All I am given is that the plates are 3kV apart (+3 on the top, 0 in the middle, -3 on the bottom), and they are riding on a 10kV RMS AC signal.

I have attempted using a boundary electrical potential condition with a harmonic perturbation, but I have little confidence in the correctness of my approach.

For clarity: I am asking the best way to apply 10kV RMS AC signal +/- 3kV DC offset to a geometry.

I am using version 6.1, and the AC/DC module.

2 Replies Last Post Oct 3, 2024, 2:06 p.m. EDT
Edgar J. Kaiser Certified Consultant
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Posted: 6 months ago Oct 3, 2024, 12:59 p.m. EDT

David,

the most general way is to run a time dependent study. Make sure you run a stationary step with the BCs for t = 0 before the time dependent step.

Cheers Edgar

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Edgar J. Kaiser
emPhys Physical Technology
www.emphys.com
David, the most general way is to run a time dependent study. Make sure you run a stationary step with the BCs for t = 0 before the time dependent step. Cheers Edgar
Robert Koslover Certified Consultant
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Posted: 6 months ago Oct 3, 2024, 2:06 p.m. EDT

Is your problem linear? If so, it would seem to me that you might be able to add the extra potential in post-processing.

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Scientific Applications & Research Associates (SARA) Inc.
www.comsol.com/partners-consultants/certified-consultants/sara
Is your problem linear? If so, it would seem to me that you might be able to add the extra potential in post-processing.

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