Kapanadze Cousin - DALLY FREE ENERGY

[verpies]

@Jeg

Please do not post any more scopeshots in the JPG format, because they are messy, inaccurate, hard to edit and take more bytes.

[Hoppy]

hi hoppy,

TVS diode cannot be used at snubber side it will self destruct from heat and etc.Although higher power zener is more suited for this task of limiting peak voltage.But i don't recomend anyone to use it in this PWM circuit.

Hi Magpwr,

The purpose of the TVS is to protect the switching device. The lower the voltage is clamped, the hotter the TVS will run but it will not self-destruct if selected for rating correctly and with a series resistor if necessary.

[verpies]

T-1000: I believe that you've brought up a good point, concerning not being able to use the double primary windings to return anything back to the PS.

No, it is a very bad point.

There is also a diode on the output of the PS, not allowing anything back into it from the yoke/grenade device.

That diode does not matter because the energy supply reservoir (a.k.a. power supply) does not end BEFORE this series blocking diode.
This reservoir ends on the last power supply filter capacitor which is after the diode and it is this capacitor that will be recharged by the recycled energy.

When the voltage across this filter capacitor exceeds the voltage delivered by the power supply - V_F of the series blocking diode, then the current will stop flowing from the power supply, which will represent a reduction in the external energy consumption.

So your and T-1000 error is in the definition where your power supply circuit begins and ends.

I don't see the benefit, as mentioned by Verpies. Maybe someone can further explain. Or show how it can make any difference.

A) Reduced external energy consumption.
B) Non-dissipative spike clamping (no heat)
C) 2*V_CC clamping voltage, that adjusts itself to the Drain supply voltage.
D) No need to use high-voltage MOSFETs with high R_DS-ON, which leads to cooler MOSFET operation.

Neither the Ruslan nor Akula devices needed such a change.

I am not claiming non-dissipative clamps are needed.  I claim they are better.
Just like a Ferrari is not needed to get you to San José, but it is better than walking...

Nor will the normal size primary wire fit on the yoke, if doubled, in any case.

That is the only disadvantage of non-dissipative clamps, but that disadvantage is mitigated by the lack of need to wind the double primary with the wire of the same diameter.
IMO the 4 advantages listed above outweigh the inconvenience of a doubled primary winding.

Verpies:  Seams like you are using conventional electronics theory for normal closed circuits, with this open type of circuit.

It is not only a theory. The non-dissipative clamps work as evidenced by Itsu's latest video....and they work better than the RCD snubbers which just waste energy as heat.
The operation of MOSFETs is also conventional, as well as the operation of the PWM controller such as the TL494 and Zener or TVS diodes, so what is your point?
Do you claim that some "magic" is happening in the Yoke and clamping its spikes differently will destroy it?

While we are at it, where exactly do you expect the "magic" to happen?  PWM controller, drivers, MOSFETs, Snubbers, Yoke, Grenade, Air ?
I need to know this demarcation line in order to know where to stop thinking conventionally and begin to think "magically".

If you want to get rid of extra draw, or consumption, the  three fans running to cool this system could be done away with, and just run passive cooling (heatsinks), instead. 

I don't even count the cooling costs as the "extra draw" but I sure as hell count the heat production as needless losses.
An ounce of prevention is worth a pound of cure.

Or, just use a battery or two, instead of a PS, to return BEMF from the second primary yoke coil, back to a battery?

The filter capacitors after the PS already play that role and constitute an energy reservoir that captures the recycled energy.
 

[T-1000]

  If you want to get rid of extra draw, or consumption, the  three fans running to cool this system could be done away with, and just run passive cooling (heatsinks), instead. 
  Or, just use a battery or two, instead of a PS, to return BEMF from the second primary yoke coil, back to a battery?

The simple thing to think about - what cause MOSFETs to heat up in first place? It is not their normal operating amperage by the way...
Also the circuit I shared is already on PCB and is part of PLL circuit in my place. Way too far from debating about it.
So I will just skip non-constructive part of the posts here.

Cheers!

[verpies]

The purpose of the TVS is to protect the switching device.

A switching device, such as a MOSFET, can be destroyed by a Drain-Source overvoltage as well as Gate-Source overvoltage.
Apparently Magpwr had in mind only the protection of the Gate-Source junction.

Protection of which did you have in mind?