Kapanadze Cousin - DALLY FREE ENERGY

[verpies]

I would rather make another Yoke driver board and remove any parasitic capacitance and additional primary windings from the yoke.
You can try this circuit we used:
http://i.imgur.com/DZ4wieI.png

But why change it if it works better than dissipative snubbers?

R26 -- When there is considerable kickback (which you will get initially while trying to establish tuning), use the attached resistor to dissipate waste power ...The amount of heat they can handle is phenomenal. 

Isn't it better to put this "kickback" energy back into the power supply instead of generating phenomenal amount of heat ?

[T-1000]

But why change it if it works better than dissipative snubbers?
Isn't it better to put this "kickback" energy back into the power supply instead of generating phenomenal amount of heat ?

The MOSFET driver part has to be in 1 IC for best possibility to control dead time on MOSFETs. It is better to skip begining of the square wave entirely (where BEMF happen from previous cycle) than fight it.
For a BEMF itself it is opposite polarity to the power supply and you cannot recycle it directly back to the power source. It will need galvanic isolation and possibly transformer for this.
My usual implementation are just blocking diodes in series between MOSFET and the coil. Then raising power input voltage a bit to match same configuration. The small capacitor in parallel to the coil then can do its job.

[Jeg]

Hi T,

nice try, but i started with that "green box" snubber system from Oleg some weeks ago, it showed terrible ringing, i think Jeg had the same experience.

Much better is this loss-less clamp design allthough it seems somewhat complicated, it really is not.

I will take a look at Dogs comments below, perhaps some better/extra components could do the trick.

Itsu

Nice work Itsu! Indeed Oleg's snubber was very spiky but I guess that as acula's snubber, everyone fit their component values according to their device which has different parasitic capacitance. Yesterday I recalculated acula's snubber for my driver. By using 4.4nf / 220 ohm all my ringing has disappeared. Drain is like square but with a high narrow peak at each start. Today I will try to combine D1's snubber to see if it can disappear this narrow peak.

Dog1 thanks for the advices.

[verpies]

The MOSFET driver part has to be in 1 IC for best possibility to control dead time on MOSFETs.

That is not true practically.  Channel skew is on the order of single nanoseconds and 2ch MOSFET drivers do not have them balanced perfectly either.  Not that it would matter in the light of the MOSFET manufacturing tolerances.

It is better to skip begining of the square wave entirely (where BEMF happen from previous cycle) than fight it.

Explain that better.

For a BEMF itself it is opposite polarity to the power supply and you cannot recycle it directly back to the power source.

That is not true.  Itsu just showed a circuit that does that and another project with motor flyback capture show that it is doable, too.  Practically.

It will need galvanic isolation and possibly transformer for this.

Galvanic isolation is a good idea but it introduces rather large delays unless MHZ capable isolators are used.

My usual implementation are just blocking diodes in series between MOSFET and the coil.
Then raising power input voltage a bit to match same configuration.

Blocking diodes do not help with dissipating or recycling the energy stored in the leakage inductance when both MOSFETs are opened.  Clamping TVS or Zener diodes just dissipate this energy without recycling it and they don't adjust their clamping voltage to the Drain voltage like the non-dissipative clamps do.

[magpwr]

The Oleg's version of PLL driver was also with mistakes in circuit and I had to spend time fixing on assembled PCB already. This is why there is different version of circuit.

hi T-1000,

This is the final minor modification of the Oleg and Sergey circuit before planning component layout on breadboard and then commence soldering components onto breadboard.

This would allow anyone to select single pulse or interrupter pulse via 2 separate 3 pin jumper using only total "7" gates of 2x 74HC132 compared to Sergey circuit 10 logic gates.

I used Mylar polyester capacitor only for areas related to logic gates on breadboard.

Previously bought random values in bulks/packet from ebay for very low price <$10 usd( can't recall) compared to buying individual components.
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Layout of Sergey kapanadze device is different from what was given by Akula.I hope to achieve something better than the effect of URFA.

Forgot to mentioned for my Tesla Transponder i am using smd 68pf 4kv high Q RF ceramic capacitor in parallel with 4 turns after previously tuning with 1kv rated variable capacitor 20pf to 1nf.
I am sure 1 or 2kv smd ceramic capacitor would do.


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Circuit board reattached after removing 560ohms resistor.