A Kapanadze generator replication - Febuary 2013

[zcsaba77]

Hi guruji,

I'm sorry I don't have a schematic. I was using a standard B/W TV unit as is. This runs at a frequency of just over 16 Khz (raster scan for 625 lines) But as quoted yesterday, I felt the HT spark did not have enough energy to do the job. A colour TV flyback has a much higher output in the order of 25 Kv but still runs at 16 Khz. My own feeling is that the Flyback oscillator frequency should match the resonant frequency of our Primary L C circuit. This would then minimise the primary's energy requirement.

Quote, Zcsaba77. I don't think we need ridiculously high voltages, I proved that yesterday. Both input sources to my primary winding were aproximately 8Kv. But the bigger windings of the 50 Hz ignition transformer were providing a better spark. Only problem was the frequency.

Cheers Grum.

Hi Grumage

If I good understood you have NOT frequency adjustable HV transformer, and you wanna(must) build coil exactly what can resonate good, or you tried build adjustable coil (sliding contact on coil)?
You supplied by 8KVs? but if you did some turns on primary coil, it should be amplifying effect, because one turn voltage over 100Vs (maybe much more).
Your apparatus is air or ferrite cored?

[Grumage]

Hi Grumage

If I good understood you have NOT frequency adjustable HV transformer, and you wanna(must) build coil exactly what can resonate good, or you tried build adjustable coil (sliding contact on coil)?
You supplied by 8KVs? but if you did some turns on primary coil, it should be amplifying effect, because one turn voltage over 100Vs (maybe much more).
Your apparatus is air or ferrite cored?

Hi zcsaba77,

You are correct. I do not have a variable frequency HV supply. Neither do I have a variable primary. The core is loaded with 10 by 38mm Outter Diameter 13mm Thickness Ferrite Ring Core Tube Toroids
@ 12.0uh. 5 at each end. Gap in the middle.Primary coil is 200 turns 22 SWG (steel wire gague) with an inductance of 2mH.
HV storage capacitor 6nF @ 16KV. So if I am correct I need an HV frequency of 45.94 Khz to be in resonance.

I am going to try this drive circuit into a Motorcycle ignition coil and see what happens. Will hopefully be able to let you all know later if it has worked.

[zcsaba77]

Hi zcsaba77,

You are correct. I do not have a variable frequency HV supply. Neither do I have a variable primary. The core is loaded with 10 by 38mm Outter Diameter 13mm Thickness Ferrite Ring Core Tube Toroids
@ 12.0uh. 5 at each end. Gap in the middle.Primary coil is 200 turns 22 SWG (steel wire gague) with an inductance of 2mH.
HV storage capacitor 6nF @ 16KV. So if I am correct I need an HV frequency of 45.94 Khz to be in resonance.

I am going to try this drive circuit into a Motorcycle ignition coil and see what happens. Will hopefully be able to let you all know later if it has worked.

Hi Grumage

Can you build coil exacly to 16KHz? you not tried less turns (example just 1/3 of 200 = 66)?

[zcsaba77]

ZVS is short for Zero Voltage Switching  i.e. you operate the active switching device when the AC waveform to be switched just goes to zero voltage. This way the device dissipation could be kept at the minimum possible. Here is a link:
http://www.ti.com/lit/an/slua159/slua159.pdf


I found this video on ZVS: http://www.youtube.com/watch?v=0ONq3DxXE2w

Hi Gyuszi

This video looks like circuit diagram about induction heater , if am I correct.
This type circuit is ZVS?

[guruji]

Hi Grumage and Zcsaba ; yes as gyulasun said ZVS schematic is on the net if you google. This driver is very wild and deadly too cause it can pump alot of ma in a 1inch or more arc so if you're planning to build this be aware of it.
Today I remembered the setup I did last time as shown but changed cap to a 2500v smaller cap.
Another thing how can one do multi quote on this forum?
Still nothing OU yet cause I lit a 25w bulb I think same as input now.