Kapanadze Cousin - DALLY FREE ENERGY

[Hoppy]

Hoppy,

i wonder why the switch is there,  to switch what?


Concerning the ATX, the internal 150 DC rail, is just that, an internal 150 DC rail only to supply 150V DC to the nano-pulser.
It is not connected to the ATX ps.

This ATX PS is connected to the L4 output coil which suppose to supply about 200/250V DC after being rectified by the FWBR and the 3 Caps.
Most switched PS's will work ok, on 200V DC, and as they have good filtering on the input i doubt that those mentioned burned out PS are damaged by spikes, more probably because of too high (DC) voltage.
So a stabilizer (200V zener or so) might be good to implement.

I estimate that the whole internal Dally device is not drawing more then 1Amp at 12V.
The excess energy lightning the 220V 30W bulb suppose to come from the L4 coil "in combination with"/via the ground connection.

Anyway, this i my take on it.

Regards Itsu

Itsu,

There is one leg of each winding (L1 & L4) connected together and to earth ground, plus the ATX PSU is indirectly connected by induction from L1 to L4, so initially at least the loading is on one of the TP secondary coils.

Regards
Hoppy

PS. I meant to add that I too don't know the function of the switch. Also, I was looking through my original print-outs, which included the main coil winding schematic and have penciled in 12-15KHz for the LI coil, so the plot thickens. Unfortunately, I don't remember where this came from.

[verpies]

@Itsu

It is not a good idea to let the sources of your MOSFTETs pull away from ground, because of your current sensing resistors (CSR) between these sources and the ground.  This placement of the CSRs perturbs the gate-source voltage !

It is much better to put the 0.1Ω CSRs on drain current paths as illustrated on the attached diagram.
If your scope probes are not isolated then it's still no problem because you can connect the grounding leads of your probes to point A and the tips of your probes to points B and C. 

Yes, the resulting current traces will be inverted, but only if you don't enable that inverting function in your scope's channel setup.

BTW:
The schematic diagram below represents exactly what you have built, but it also shows the internal TL494 transistors (the numbers in blue circles are the TL494 pin numbers) and this schematic is just drawn in a different manner.

[starcruiser]

Perhaps this would be of use to some here as this was researched due to russian parts in the schematics

BC146 Transistor Datasheet. Parameters and Characteristics.

Type Designator: BC146

Material of transistor: Si

Polarity: npn

Maximum collector power dissipation (Pc): 50mW

Maximum collector-base voltage (Ucb): 20V

Maximum collector-emitter voltage (Uce): 20V

Maximum emitter-base voltage (Ueb): 4V

Maximum collector current (Ic max): 50mA

Maximum junction temperature (Tj): 125°C

Transition frequency (ft): 150MHz

Collector capacitance (Cc), Pf: 5

Forward current transfer ratio (hFE), min/max: 80MIN

Manufacturer of BC146 transistor: MSL

Package of BC146 transistor: U21

Application: Low Power, Low Noise, General Purpose

this is the US replacement for the KT315 Bi-Polar Transistor which is shown running the SCR which generates the nano pulses in the coax.

this link might be of use as well to those looking for cross reference to Russian part #'s

http://matthieu.benoit.free.fr/cross/russian_equiv.htm

[verpies]

@ Itsu
The Zeners (or high frequency snubbers) need to be connected in parallel across the primary windings in order to clamp the positive voltage spikes happening during the "dead-time" when both MOSFETs are open and during energizing the other primary by the other MOSFET closing.  A fast diode (e.g. Shottky) is needed in series with the Zener diode in order to block the forwad conduction of the Zener diode, when the MOSFET connected to it, closes.  Note that both of the aforementioned spikes have the same polarity.

In this configuration, the Zener voltages (V_Z) of the snubbing Zener diodes should be just a little bit over Vcc (note that V_Z ≥ 2*Vcc is not necessary and even harmful). The reverse blocking voltage of the Shottky diodes should be greater than Vcc.  The MOSFETs should be rated at more than 2*Vcc.

After the addition of these four diodes, measure the primary windings voltages between point A (Vcc) and the points D & E.

The schematic below illustrates connection of these diodes (D3-D6).

[itsu]

Thanks Hoppy.

Starcruiser, thanks for the link, very useable.

@verpies,

This placement of the CSRs perturbs the gate-source voltage !

Ok, i can see that, the more current being drawn, the more perturbing of the gate-source voltage  :-)

It is much better to put the 0.1Ω CSRs on drain current paths

Ok, i put those csr's in the drain and measure the current there.

This (your) built has another serious flaw - namely, the internal parasitic MOSFET diodes are conducting !!! 

So this means any MOSFET with internal parasitic diodes are causing this, meaning use your suggested method of extra Shottky diodes/snubbers, or as an alternative; swap to transistors like in the diagram below?

But then i probably will run in all sorts of other spiking problems, right? So i will go for the MOSFETs with Shottky diodes and my 17V snubber zeners.

Thanks for your very clear explanation/diagram.

Regards Itsu