Kapanadze Cousin - DALLY FREE ENERGY

[verpies]

Hi Verpies
I would like to ask your opinion on the difference between multistrand wires and solid core wires. In this application with 12+12 turns primaries, would it be any difference if we use the one or the other kind?

From electronic point of view the stranded wire behaves a little more like a Litz wire compared to a solid wire, because the conduction between the strands is not perfect due to naturally forming oxides and sulfates, which form a weak insulation layers between strands.  Also, strands are usually not ideally parallel and this limits their contact area and mutual conductivity.

Of course an older or previously heated wire will have more of this decreased conductivity between strands, making it act more and more like a Litz wire with time which has lower impedance to HF currents than a solid wire.

[Jeg]

From electronic point of view the stranded wire behaves a little more like a Litz wire compared to a solid wire, because the conduction between the strands is not perfect due to naturally forming oxides and sulfates, which form a weak insulation layers between strands.  Also, strands are usually not ideally parallel and this limits their contact area and mutual conductivity.

Of course an older or previously heated wire will have more of this decreased conductivity between strands, making it act more and more like a Litz wire with time which has lower impedance to HF currents than a solid wire.

Thanks a lot Verpies! I was hopping to hear that there is no difference, as solid core wires are much cheaper than stranded. Nice point of view though. I have to search now for speaker wire I guess.

[itsu]

I removed the PLL system from my circuit as i have doubts about its ability to do what it suppose to do which is tracking the inductor/wima caps LC resonance.

It will lock on a given frequency, but it won't follow the resonance of the LC when being loaded (shifted).
For it to do that it should have some peak detecting / following capabilities which i do not see present with my limited knowledge of PLL systems.
If it is present then someone please point me to it and explain how it works.

I am now using the via Ebay ordered little TL494 circuit which drives a pair of UCC37322 MOSFET drivers to drive the yokes MOSFETs.

I can control with a little potmeter the frequency and have set the duty cycle to the max. 45%.

One thing i noticed is that the resonance frequency of the inductor/wima caps LC is NOT the max output on the grenade / bulbs, there is a few hundred Hz difference.


Screenshot below shows:
the voltage (yellow trace) across the wima caps (in resonance).
the little peaks (green trace) on the Kacher MOSFET gate
the yokes MOSFETs gate signals (blue and purple traces).

By the way, there is a resonance frequency shift when more bulbs are added to the load even when using the TL494 circuit
1 bulb (100W) gives 15.28KHz
2 bulbs gives 15.39KHz
3 bulbs gives 15.43KHz
4 bulbs gives 15.52KHz
5 bulbs gives 15.66KHz
6 bulbs gives 15.71KHz
7 bulbs gives 15.81KHz
8 bulbs gives 15.84KHz
9 bulbs gives 16.02KHz
10 bulbs gives 16.09KHz.

Video here:  https://www.youtube.com/watch?v=zdIf9Pjyuhs&feature=youtu.be

Regards Itsu

[AlienGrey]

Now that is interesting, a PLL is just phase lock, and frequency off the PLL just tries to pull in with the VFO, so if you put a divider in series it will double the lock frequency, you need an AVC control circuit like an LM393 to track for maximum frequency (VFO)     against amplitude feed back circuit, hmm no one else has reported this problem yet. Any way nice video.

AG

[Jeg]

It will lock on a given frequency, but it won't follow the resonance of the LC when being loaded (shifted).

Nice work Itsu!
I just wonder why i can't reach the same voltage as your inductor/wima caps when in resonance. I see that you reach voltages up to some 700V while i can not exceed 300V. I use 24V pwr supply, 2XIRFP250 mosfets, 2Χ12T primaries and 25+25T inductor. I will try again today as i find it real weird. In the meanwhile, when i start my heater circuit (yoke-mosfet driver) a strange sound is emitted from my yoke. It is a hissing sound like which also gives anomalous behaviour when i adjust my frequency or pwm.!