Капанадзе

[Jeg]

Hi guys
Itsu very nice to see you here, i hope you can help on this!

Guys the driver is giving 50 or 100Hz, by modulation. The high frequency component is at Mhz. So i guess that his complex driver is an RF amplifier actually. If we could find the correct type of Bunk's driver and its circuit we could get an idea of how he modified it. Or else, what are we doing here all those years! We can make our own drivers!!! 

[r2fpl]

The old versions ballast had no security features when the light bulb was missing.
I think it was the first modification to make the system work all the time.
The second modification may refer to the pulse width for the coil.
Maybe the voltage at the output.

help: https://www.youtube.com/watch?v=eq87-sVVezg

[Void]

Jeg: Before we can attempt to make our own driver, we would need to be clear on what
type of driver output waveform we are aiming for.  If Mr. Bunk has not explained this or
shown the driver output waveform on a scope, then we would be going at it blind, which
is not good at all.

r2fpl: Thanks for the video link. I will watch that video when I get a chance. Looks good.

[partzman]

The old versions ballast had no security features when the light bulb was missing.
I think it was the first modification to make the system work all the time.
The second modification may refer to the pulse width for the coil.
Maybe the voltage at the output.

help: https://www.youtube.com/watch?v=eq87-sVVezg

One small detail missing from the video analysis [unless I missed it] is that the inductor driving the bases of the bipolar transistors is saturating under normal operating conditions.  This is what sets the operating frequency for the series resonant output.

I am very familiar with this type of circuit as I hold a patent [US4,914,558] on this technology which was stolen and incorporated in every CFL coming from China.  Many variations can be built from this basic concept and is not limited to bipolar switches by  any means.

Regards,
Pm

[Jeg]

Jeg: Before we can attempt to make our own driver, we would need to be clear on what
type of driver output waveform we are aiming for.  If Mr. Bunk has not explained this or
shown the driver output waveform on a scope, then we would be going at it blind, which
is not good at all.

Hi Void
I have seen this again and indeed blindly replicating is the worst thing an experimenter can do. But it is not a new idea. Bringing voltage in phase with current across a load, is something that many people have talked about. And if this is the case then the range of frequencies that involve is related to what we already know about Tesla coils, sfr, 1/4 etc.

Regards