New Topology
The Lightning Stalker, Sat Mar 16 2019, 05:19AMI don't have anywhere else currently to release this so I'm putting it here. This is still just a preliminary drawing and has not been tested.
Re: New Topology
The Lightning Stalker, Sat Mar 16 2019, 05:25AM
Of course the image uploading is broken.
The Lightning Stalker, Sat Mar 16 2019, 05:25AM
Of course the image uploading is broken.
Re: New Topology
The Lightning Stalker, Sat Mar 16 2019, 05:26AM
Ok try this
The Lightning Stalker, Sat Mar 16 2019, 05:26AM
Ok try this
Re: New Topology
Hazmatt_(The Underdog), Sat Mar 16 2019, 04:08PM
You need to add an oscillator to the input, the oscillator is not going to self-start, and Ctank needs to go away, or go in parallel to the primary.
Hazmatt_(The Underdog), Sat Mar 16 2019, 04:08PM
You need to add an oscillator to the input, the oscillator is not going to self-start, and Ctank needs to go away, or go in parallel to the primary.
Re: New Topology
Patrick Konesky, Sun Mar 17 2019, 04:27AM
Isn’t that a current sense transformer? It might oscillate but with a bad phase shift.
Patrick Konesky, Sun Mar 17 2019, 04:27AM
Isn’t that a current sense transformer? It might oscillate but with a bad phase shift.
Re: New Topology
Hazmatt_(The Underdog), Sun Mar 17 2019, 09:53PM
It's the base return of his coil primary that he's using as feedback to steer the oscillator, but at turn-on there is no feedback.
Hazmatt_(The Underdog), Sun Mar 17 2019, 09:53PM
It's the base return of his coil primary that he's using as feedback to steer the oscillator, but at turn-on there is no feedback.
Re: New Topology
The Lightning Stalker, Tue Mar 19 2019, 09:02AM
The pot and resistor are there to provide startup bias.
The Lightning Stalker, Tue Mar 19 2019, 09:02AM
The pot and resistor are there to provide startup bias.
Re: New Topology
hen918, Tue Mar 19 2019, 04:37PM
As far as I can see the phase between input and output is inverted, i.e. the dots need to be the other way, and I'm not sure the dv/dt of the turn on will be enough to kick the input the other way to start the oscillation.
hen918, Tue Mar 19 2019, 04:37PM
As far as I can see the phase between input and output is inverted, i.e. the dots need to be the other way, and I'm not sure the dv/dt of the turn on will be enough to kick the input the other way to start the oscillation.
Re: New Topology
The Lightning Stalker, Wed Mar 20 2019, 08:01AM
The N/P follower is non-inverting, so it should be in phase.
The Lightning Stalker, Wed Mar 20 2019, 08:01AM
The N/P follower is non-inverting, so it should be in phase.
Re: New Topology
2Spoons, Wed Mar 20 2019, 09:12PM
I would have thought you need more gain in the loop to ensure oscillation. Also what are you doing with that 2n2222 at the bottom of the bias chain? Is that meant to be a constant current bias? Because thats a horribly unstable way to do that - depends heavily on the transistor gain and temperature. You would be better off with just a resistor.
Also startup is more likely if you were to bias your follower into class AB.
2Spoons, Wed Mar 20 2019, 09:12PM
I would have thought you need more gain in the loop to ensure oscillation. Also what are you doing with that 2n2222 at the bottom of the bias chain? Is that meant to be a constant current bias? Because thats a horribly unstable way to do that - depends heavily on the transistor gain and temperature. You would be better off with just a resistor.
Also startup is more likely if you were to bias your follower into class AB.
Re: New Topology
The Lightning Stalker, Thu Mar 21 2019, 10:36AM
All very valid points
The 2N2222 is for the interrupter. If and when I test it I'll find out what if anything needs to be modified. The MUR diode in particular will probably need to be something with greater IF.
The Lightning Stalker, Thu Mar 21 2019, 10:36AM
All very valid points
The 2N2222 is for the interrupter. If and when I test it I'll find out what if anything needs to be modified. The MUR diode in particular will probably need to be something with greater IF.
Re: New Topology
The Lightning Stalker, Tue Apr 09 2019, 03:26AM
Updated the OP with a modified schematic after doing some simulation. I liked the idea of driving series resonant but it results in a more voltage dependent step-up mode instead of the desired current to voltage conversion. After all Tesla coils are supposed to be current to voltage converters. Anyway that is as far as I can trust the accuracy of the simulation.
The Lightning Stalker, Tue Apr 09 2019, 03:26AM
Updated the OP with a modified schematic after doing some simulation. I liked the idea of driving series resonant but it results in a more voltage dependent step-up mode instead of the desired current to voltage conversion. After all Tesla coils are supposed to be current to voltage converters. Anyway that is as far as I can trust the accuracy of the simulation.
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