Kapanadze Cousin - DALLY FREE ENERGY

[Tomtech29]

Nick,

i think you overcomplicate things, the little TL494 circuit has a fixed frequency and fixed duty cycle, but as i have shown, this can easily being changed.
I don't know why you would want a variable duty cycle as the only thing you want is resonance of the inductor which can be achived fine with the fixed 40%
duty cycle as i also have shown.


Below is a picture of how the tl494 circuit is connected to my 2 MOSFET drivers (ucc37322's)
The snubbering (on the MOSFETs) i use is from Olegs green box diagram (R26, VD6/7, C15) assisted by 3 18V TVS in series across each drain/source.

In the mean time there are severall solutions presented here lately, so please stop complicate things, order some basic components and start building because you
won't find a 100% matched commercial solution


Itsu

you're right Itsu something simple to start Nickz

[verpies]

Perhaps Mag's driver controllers can adjust both frequency and duty cycle. As the TL 494 IC can't do both,

Yes, the TL494 cannot track the frequency of the LC resonance by itself.  It can only vary the duty cycle, which affects the amplitude or rate of energy transfer to the LC circuit.

As that TL 494 board is not a true PWM. Only provides a steady 40% duty cycle, on both sides. 

The commercial board might have a fixed frequency and duty cycle but the TL494 is a fully fledged PWM chip, that can adjust the duty cycle automatically on the fly in order to regulate the output amplitude. 

[Tomtech29]

Thanks Tom, yes- the zeners should be two, and as my mosfets are I RF3205 I will use 6V zeners , my mistake. I also increased the resistor to 10K. The diodes - I can use that 1N4007 or I have some choice of others (ex.  UF5408 ....)  What suits best?   Maybe varistor is not important? If -what voltage to use?

Thanks,

what you want to use the power amplifier mosfets IRF3205  55V!?
(diode look for me in the old power supply atx something under the sink)

[itsu]

Yes, a current monitoring device, such as a CT or CSR in the LC circuit where resonance is to be tracked and maintained, is sufficient for a PLL to lock onto the i/v phase of the LC circuit.

Itsu has used a CSR in his version of the LC resonance tracking with PLL.  ...and I am not referring to his videos with the TL494 PWM board/chip.
PWM adjusts the amplitude of the LC oscillation through the modulation of the pulse width and the PLL tracks the LC resonance frequency throgh i/v phase feedback.  Both chips mate quite easily.

Verpies is refering to a design from him which i build and is using my Rigol FG to supply the base frequency (VCO part), see picture.

It locks on the Series LC (inductor/wima caps in our Ruslan setup) when in resonance (when voltage and current are in phase)
and tries to keep them (voltage and current) in phase, thus in resonance.

It works very nice, but as mentioned it uses my Rigol FG as VCO which is a problem for most.

As verpies mentioned earlier, the used CD4046 chip also has an onboard VCO, so i will try to add that to the breadboard to see if i can omit the use of the Rigol FG.

Perhaps also adding a IR2184 chip so we can directly drive the MOSFETs from there like in the green box from Oleg.

Regards Itsu

[Void]

While it might be a 'nice to have' feature to have the PWM automatically adjust its frequency
to match the resonance frequency of the yoke secondary loop as it changes with different loading
at the output, I agree with Nick that it is more important to try to find out how to get this type of setup
to produce even a little over unity.

Verpies' TL494 circuit diagram he posted a little while ago with manual adjustment for frequency and pulse
width should be fine for experimenting to try to find over unity.

If Itsu can get the auto frequency adjust circuit working while driving the yoke circuit, that is a bonus.
Good work on that Verpies and Itsu. Maybe once you get it fully tested you guys can post the schematic...