High voltage resonance

[Olly]

Has anyone ever tried charging a capacitor up to quite a high voltage, say 200V or more and then connecting across a TX coil and allowed to resonate till it damps away to give a very high Ampere Turn field?

This could be repeated every milliSecond or so. Just wondering whether there would be any merits in pursuing something like this or has it already been tried and discarded?

[Artyom]

Has anyone ever tried charging a capacitor up to quite a high voltage, say 200V or more and then connecting across a TX coil and allowed to resonate till it damps away to give a very high Ampere Turn field?

This could be repeated every milliSecond or so. Just wondering whether there would be any merits in pursuing something like this or has it already been tried and discarded?

I have seen a similar method for a long time in a two-frame depth detector. I didn't do it and can't say anything more specific.

[profesor]

I want to get rid of the huge coils.
I will try this method.I want to get rid of the huge coils.
I will try this method.

[moodz]

There’s a patent on the decaying resonant method somewhere … Dave Emery maybe.

Are you suggesting a 200 volt spike or 200 volts continuous, fairly inefficient and will probably kill you.

[Olly]

There’s a patent on the decaying resonant method somewhere … Dave Emery maybe.

Are you suggesting a 200 volt spike or 200 volts continuous, fairly inefficient and will probably kill you.

I was thinking about a periodic 200V from a boost converter or such like, but on reflection it's easier to current charge the coil inductance and then swicth the capacitor in while simultaneously disconnecting the current source. Should have the same decaying resonance effect.

Will have a search for the patent.

Regards,
Olly

[Olly]

I was thinking about a periodic 200V from a boost converter or such like, but on reflection it's easier to current charge the coil inductance and then swicth the capacitor in while simultaneously disconnecting the current source. Should have the same decaying resonance effect.

Will have a search for the patent.

Regards,
Olly

OK, found the link
https://image-ppubs.uspto.gov/dirsea...df/20090045813

Looks like the idea in the patent is to resonate the RX coil, I'm proposing resonating the TX coil - just not sure whether there is much mileage in trying this out although some of the simulations I've tried out suggest that very high Ampere Turn peaks are possible (In excess of 100At for 300uH, 23turn, 1Ohm coil) from a 12V battery.

I guess this would be more of a VLF IB detector than anything else, just with a considerably higher TX power (in bursts) than with a standard Colpitts.

[profesor]

If the transmitting coil field strength is too high, the ground effect increases too much.
I have seen this in experiments. I think this method will work in pulse system.

[profesor]

https://www.eevblog.com/forum/repair...atva-4-repair/
electric fence system for high voltage.
a mosfet is added instead of the triac here.
thus creating a high impact force.