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Registered Member #575
Joined: Sun Mar 11 2007, 04:00AM
Location: Norway
Posts: 263
Hi, so I have been on this forum for a while and my general understanding of electronics have absolutely increased, but I have one question: If I have a Tesla coil that runs in resonance, what will this mean? The way I see is that when you run something electric under resonance the impedance decreases. So you will be able to drive for instance a Tesla coil at maximum efficiency when you switch it in resonant frequency, but why is it like this? And why should you keep something out of resonant frequency like GDTs.
And what about the DRSSTC topology I have read the WIkI and it didn't make me any smarter. Do you add a capacitor to the primary so it gets the same resonant frequency like the secondary?
Again, I'm not specially good to formulate my questions..
Registered Member #1403
Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
Have you read some of Richies articles?
At resonance we have a huge voltage rise, thats why we use it in tesla coils and do not want it in transformers or gdt's.
I have tried to find an explanation myself, but there seems to be two theories about the voltage rise wether its a product of resonance or something with transmission lines or even a third theory that I forgot about. This is were I found it too hard for me so understand and left it for the future.
Registered Member #1232
Joined: Wed Jan 16 2008, 10:53PM
Location: Doon tha Toon!
Posts: 881
I think one of the best analogies for resonance is pushing a child on a swing. If you get the timing perfect and push at the right moments you can build up the oscillation of the swing to a very large amplitude. Certainly more than most kids feel comfortable with!
However, if you attempt to push the swing when it's currrently moving quickly towards you, you won't build up a high amplitude oscillation, and you'll most likely end up sat on your backside winded!
The interesting points here are that it's not just the frequency at which you push the swing that matters, but the phase too. Also pushing at the wrong times doesn't just limit the amplitude of the resulting oscillation, but can also be hard on the driver!
Registered Member #575
Joined: Sun Mar 11 2007, 04:00AM
Location: Norway
Posts: 263
GeordieBoy wrote ...
I think one of the best analogies for resonance is pushing a child on a swing. If you get the timing perfect and push at the right moments you can build up the oscillation of the swing to a very large amplitude. Certainly more than most kids feel comfortable with!
However, if you attempt to push the swing when it's currrently moving quickly towards you, you won't build up a high amplitude oscillation, and you'll most likely end up sat on your backside winded!
The interesting points here are that it's not just the frequency at which you push the swing that matters, but the phase too. Also pushing at the wrong times doesn't just limit the amplitude of the resulting oscillation, but can also be hard on the driver!
-Richie,
Ahhh, now I really got the final bit in place. This explains so much, why the need of freewheel protection diodes and such.. Thanks Richie!
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Question about resonance
