Kapanadze Cousin - DALLY FREE ENERGY

[Jeg]

You'd be much better off with a choke in place of that resistor there.

Thanks for the choke advice. I'll try to incorporate it.

About this parasitic fluctuation across Vcc and ground. It happens every time each mosfet stops conducting. Looks like my decoupling cap of 100nF across driver's legs, is not adequate for this task. Probably needs higher value. Is that correct?

ps. In addition i see a negative direction spike over voltage each time a gate signal starts. It is like that regulator's output current is not enough so to charge the gate capacitance without affecting regulator's output. Will it be improved if i increase the value of 33uF which is at the output of my regulator after this 4 Ohm resistance?

[itsu]

Hi Jeg,

i see a lot of 2 stripes resistors (meaning 2W) in your 12V supply line feeding both the TL494 and the IR2110.
This points to some current flowing there, so you might be right by suspecting this could cause some 12V voltage fluctuation.

I would have both the TL494 and the IR2110 to be on separate regulators, and have a 10uF tantalum capacitor across
the IR2110 voltage supply lines to aid in the boost to charge the gates capacitance.

Also, i would add some heavy capcitors on the 12V regulators output like a 470uF electrolytic cap and a 0.1uF ceramic cap.

Finally the layout/length of the wires and components could be of importance, but that would be hard to debug.

Regards Itsu

[skywalker66]

    ...
  This last blurry video powering up 2000w from a simple Kacher circuit is a hoax, as far as I'm concerned, until it's actually replicated, and proven otherwise. Which is not going to happen, at least not from one of us.
  ...

Hi Nick !
That is not a simple Kacher circuit, but is a more complex arrangement of coils around a simple Kacher.  It have including a induction element - a series resonance like in Ruslan device.
So it is not quite a plain kacher. The guy managed to get rid of all those complex electronics specific to akula/ruslan devices, but the key elements remain in place and do their good job nicely.
I love this simple setup, I even think to give a try some day.
And btw, it is not powering just 2000W, but 4000W. Well ? And all that power starting from a simple kacher passing thru a specific coil architecture, and voila magic .

[Jeg]

Hi Jeg,

i see a lot of 2 stripes resistors (meaning 2W) in your 12V supply line feeding both the TL494 and the IR2110.
This points to some current flowing there, so you might be right by suspecting this could cause some 12V voltage fluctuation.

I would have both the TL494 and the IR2110 to be on separate regulators, and have a 10uF tantalum capacitor across
the IR2110 voltage supply lines to aid in the boost to charge the gates capacitance.

Also, i would add some heavy capcitors on the 12V regulators output like a 470uF electrolytic cap and a 0.1uF ceramic cap.

Finally the layout/length of the wires and components could be of importance, but that would be hard to debug.

Regards Itsu

Hi Itsu

Hmm. Ok. I will add some heavier caps to see the behavior. I use two regulators, one for each chip. In general, my outputs right now are acceptable for my needs. If I could also debug this power supply decoupling then I would be more than happy.

[verpies]

About this parasitic fluctuation across Vcc and ground. It happens every time each mosfet stops conducting. Looks like my decoupling cap of 100nF across driver's legs, is not adequate for this task. Probably needs higher value. Is that correct?

Almost.  But 33uF electrolytic is not a good one because of the high ESR which is more detrimental than low capacitance.
I'd use an additional 0.47uF ceramic in parallel.  See this video for the reason.

PS. In addition I see a negative direction spike over voltage each time a gate signal starts.

The section 12.9 of this article explains well why this happens.

Also, Itsu's advice is quite correct and his suggestion for separate regulators makes sense.

Thanks for the choke advice. I'll try to incorporate it.

A choke before the bypass caps of each regulator is called for.


Last, but not least: the area of the current loops formed by the driver <--> gate <--> source <--> driver connecrions, are the most detrimental in your setup.