Kapanadze Cousin - DALLY FREE ENERGY

[magpwr]

If your power supply is marked "Universal Input", you should be okay.  Attached is the spec sheet for my power supply.  Do notice the inrush current.  It is quite high and can certainly knock the system out of resonance if not limited in some way.


This looks like a problem we still need to adequately solve.  I used a PLL connected to the "sync" input (pin 3) of an SG3525 PWM chip.  This does work.  It will give you a resonance self-adjusting push-pull oscillator that will track with the output conditions and still allows you manual adjustment of duty cycle.  The problem I have with this approach is the duty cycle remains fixed during resonance lock.  What this means is the frequency is adjusted AND the pulse width is adjusted.  I'm not 100% sure this is what we want.  I think the pulse width should remain constant or there should be another feedback mechanism to adjust this on-the-fly, like for instance locking it to a specific waveform.  From what I have observed, the pulse width of the PWM may be even more important than the frequency of those pulses.  I'm confident of this being true when driving the Tesla coil and suspect it also to be true when driving the induction coil and grenade.

What it looks like to me is we need a circuit that can manipulate not only frequency, but pulse width and phasing between push and pull sides.  Something that controls on-time/off-time for each side as well as controlling dead-time between the two pulses.  How these need to be controlled to maintain proper resonance is still a mystery to me, but appears critical to proper operation.  I'm currently working on a circuit design that generates a manually adjustable pulse width, then toggles this pulse through a flip-flop sending it to the high side, then low side in a cyclic fashion.  Still working on the dead-time portion to make it adjustable as well.

Controlling this device has three stages that each need their own logic:  Startup, run & variable load compensation.
Maybe this can be simplified at some point.

hi Dog-One,

I have sucessfully work with PLL circuit which was design by Oleg for Ruslan it comes with phase control.Like you i was curious and i connected the output of PLL to
Dual channel splitter with duty cycle control using 1x74HC132(Prototype design by me in virtual) .My circuit was uploaded in youtube -http://www.youtube.com/watch?v=AfOSBGIdORw

The PLL will lock as long the duty cycle is minimum 33% or 39% can't fully recall.Best stick with 44% or IR2111 as simple means to split signal.I had to find out the hard way.

I am no longer after resonance for the brightest bulb show.But it's merely used as "reference point".

But i still do keep that PLL circuit on the mini breadboard which was last tested successfully months back.Future plan use is to use a divide by 10 counter 74HC4017 with PLL and set it between 1 to 4.
--------------------------------------------------------
Just implemented a Buck/boost XL6009 circuit on my existing PWM circuit so that voltage stay just below 23volts regardless of supply 3volts to 30volts.

Successfully tested my circuit on 1x18650 battery which needs 400mA to get to nearly 23volts(preset) to power circuit without connecting heatsink fan.

[itsu]

The voltage fluctuations now are raising even more questions:
1) Is your power supply limited to work in 190-240V input voltage range? Seems like that which have a problem. The PS has to work from 100 to 300V input voltage range.
2) As soon as your power supply is switching on, it starts to draw current. That results lowering inductance and the resonant frequency goes up. Is it going outside of the pre-set resonant condition frequency range?
3) Can you attach PLL with current sense on 3T near yoke instead of TL494? This will keep resonant frequency locked in.

Cheers!

T-1000,

the 24V PS label mentions:  "input AC 220V 50Hz"  so you are probably right that it only works around 220V.

The other questions like  "Can you attach PLL with current sense on 3T near yoke" are easily said then done
as the signal on the 3 turn (needed to get the voltage across the series LC) is badly distorted / squared and the current
through this series LC is in the 50A p-p range making a CSR and  even a current sensor hard to construct.

Itsu 

[T-1000]

The other questions like  "Can you attach PLL with current sense on 3T near yoke" are easily said then done
as the signal on the 3 turn (needed to get the voltage across the series LC) is badly distorted / squared and the current
through this series LC is in the 50A p-p range making a CSR and  even a current sensor hard to construct.

Itsu

This article may help:
https://translate.google.com/translate?sl=auto&tl=en&js=y&prev=_t&hl=en&ie=UTF-8&u=http%3A%2F%2Fwww.icct.ru%2Fnode%2F88&edit-text=
Please check on http://www.icct.ru/sites/default/files/pictures/pic/27-01-2012/Picts/Big-26.png and http://www.icct.ru/sites/default/files/pictures/pic/27-01-2012/Picts/Big-27.png

[Dog-One]

This article may help:
Простой лабораторный инвертор для индукционного нагрева. Часть 3.

Yes Arunas, this is very well thought out and should be a perfect basis for testing.  Great find!


The "pulse skipper" technique for power level control along with the "differential current transformer" is brilliant.  All my concerns (in my previous post) have been adequately addressed by this solution--frequency lock, pulse width, dead-time and power level.  And a big plus is his circuitry is simple, easy to build and easy to troubleshoot.

You follow the lead of Андрей Лыткин and you should have no problem driving this device.

[verpies]

the "differential current transformer" is brilliant. 

Why "differential" and not just "current transformer" ?

Google translation just does not do it justice,