 very large voltage magnification in a DC resonant design?
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Crunchy Frog
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Fri Apr 02 2010, 03:19PM
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Registered Member #2422
Joined: Tue Oct 06 2009, 02:41AM
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Posts: 85
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I've noticed that when simulating a dc resonant coil at low C and high L (around 10nF and 15H) the peak voltage ends up being much greater than 2x the input. (it says it should be 2x on  From basic electrical equations, it should be v = 2pifLI. But when I put in the numbers from the simulator, it doesn't work (I solved for frequency and it comes out too high). The voltages the simulator comes up with also vary a great deal.
So my guess is that something odd is happening to the frequency the inductor sees. Is this plausible?
Also, how much should I trust the simulator's results?
EDIT: Never mind. As usual I found the solution right after posting. It was because a significant current built up in the charging inductor while the gap was conducting.
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radiotech
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Registered Member #2463
Joined: Wed Nov 11 2009, 03:49AM
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The AC voltage across any inductor is IXl. So could you get 6.28E^6
from a 1 H inductor at 1 amp operatting at 1 mHz?
In a calculation yes, but inductors we know about have physical
limits.
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