Kapanadze Cousin - DALLY FREE ENERGY

[itsu]

Itsu, did you notice if you had the same behavior when using IR2110 instead of those two drivers you are using now?

In addition, what coupling capacitor values do you use at your 24V power dc supply?

I am thinking a case that when your first mosfet stops conducting thus increasing its drain voltage (transient period), the same time a negative front appears to your +24V at the taping point in the middle of your coils. If your power supply doesn't have the "courage" to keep its output steady at 24V while the negative front is incoming to it (through the taping point), then for that short moment (grey zone) a zero voltage appears to the drain of the other mosfet and so the sudden zeroing. If this is the case, then the fact that your drain goes to zero voltage without a gate signal, doesn't necessarily means that your mosfet is open.
It would be interesting if you could place your current probe across some low Ohm resistor connected between source and ground, and watch what happens during transition.

Jeg,  Hoppy

i don't think i was using an IR2110 (don't have those) before, perhaps you mean IR2184,  but no, i did not notice (probably did not check on it then).

The 24V supply was initially from 2x 12V batteries going through a filter consisting of a 2200uF elco, 2x 224nF caps in parallel (448nF) through a choke,
then again 2x 224nF caps in parallel, another 2200uF elco and finally a 0.1uF decoupling cap.

I lateron used instead of the batteries my bench PS (to be able to lower the drain voltages) and finally i also tested with this filter bypassed without any change.

I did measure this 24V at the center tap of the coils, so behind the above mentioned filter.

Instead of measuring current in the source to ground lead i could also just use my current probe on the drain leads to measure the MOSFET current.


Itsu

[verpies]

I will try to build up again the snubber / TVS setup like it was on that screenshot...

Lone TVS diodes will be simpler to understand than RC snubbers with diodes.

[magpwr]

hi everyone,

I have just uploaded my latest video -Tesla Transponder 2.0

http://www.youtube.com/watch?v=Yun3HjsNNKs

I have added link to this topic in the youtube description which the Oleg(nanosecond)+Sergey(interrupter)  hybrid circuit was posted previously.

This time i am running on 12volts battery which is boosted to 23volts for the mosfet driver IXDI614 and the 12volts to 220volts inverter to obtain 245volts at it's capacitor but intentionally lowered down via 10kv diode to get around 180...190volts for the Russian PIO capacitor 20uf 400volts.

Next test i will just remove protection diode in order to get around 240 dc across PIO capacitor.

Take note even if i use 48volts for the Tesla Transponder i hardly get any notable reading via clamp meter to Earth.I have already mentioned the voltage to use.

As usual i think differently from the rest after zooming into Akula version of tesla coil which i can spot there is spacing given between each winding as attached.I think i have extracted this screenshot from Akula video doing demo to his friends in someone home.

As usual i do like to challenge to anyone whom claim to be a "Tesla coil expert" and can assemble a typical tesla coil and show me if you can achieve current reading to Earth using low power with the use of interrupter.My last test was mere 0.25Amps to Earth with typical tesla coil.

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Seems like many are very comfortable playing with battery voltage like 12volts or 24volts especially so for kacher.

[itsu]

Lone TVS diodes will be simpler to understand than RC snubbers with diodes.

3 Screenshot and a video.

1st screenshot is without RC snubbers or TVS, secondaries terminated with 100 and 6000 Ohm resp.
I triggered on the wrong signal, so the gate is closed in the middle of the screen instead of open.

2th screenshot is with 2x TVS (54V) installed directly across drain/source, gate open now in the middle of the screen.

3th screenshot is as 2th, but with reduced duty cycle.

No RC snubbers installed as they seem not needed with the TVS installed.

Yellow is drain voltage
blue is gate signal
green is drain current

all referenced to ground
Current controller set to 2A/Div. on all 3 screenshots


The video will show similar, but will change from full duty cycle to low and vv:

https://www.youtube.com/watch?v=LF4MQqa9wU8&feature=youtu.be

Itsu

[verpies]

green is drain current

Unfortunately, you placed the current probe in point 1, which makes it impossible to discern whether this current flows through point 2 or 3 

P.S.
A scopeshot with 8μs gate pulse width would be the best.