Akula's 30 W lantern replication

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cd_sharp posted this 26 March 2017

This is the device shot taken from youtube. I noticed there are several versions of the schematic, slightly different that were posted on several forums. I took the screenshot from the video uploaded by Chris and I will consider this one as the basis for my replication:

I also created a Circuit Wizard file. It's a habit of mine to run a simulation before trying anything for real, just to make sure nothing blows up. It would be useful if we would be able to upload files also. I'd like to share the .cwz file with you.

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cd_sharp posted this 26 March 2017

Here is the parts list:

and the cwz file screenshot:

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thaelin posted this 26 March 2017

This is a classic unit that I have watched with interest. So wished that they would allow some others to know how it really is made and works. The world seriously need this kind of tech now. Soon my friend, soon.

 

thay

 

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cd_sharp posted this 26 March 2017

I have some trouble finding MBR3545 diodes, so I'm looking for another type of diodes. Here is datasheet:

http://www.mouser.com/ds/2/169/mbr3545_thru_mbr35100r-218591.pdf

It has a max current of 35A and forward voltage of 0.68V.

Considering this, do you think it would be a bad idea to use instead MBR1635?

http://www.mouser.com/ds/2/149/MBR1660-1011072.pdf

It supports a current of 16A (but that should not be a problem for max 30W power) and has a lower forward voltage, 0.63V. Do you think it's a good idea?

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cd_sharp posted this 29 March 2017

It's a work in progress. There is something else I don't know for sure, the inductance that I marked in red:

which is this one in the schematic:

I can see there are 7 or 8 turns. To anyone that replicated this, how many turns did you use for this coil?

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cd_sharp posted this 31 March 2017

I finished the circuit and I gave it a try. Only LED HL11 lights up for a second and then turns off. I probably made a mistake ( although I double checked everything before powering it). Any advice?

 

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Chris posted this 31 March 2017

Hi Cd_Sharp - If I may recommend, perhaps smaller steps?

Do you have a function Generator? I would try to resonate the Coils and find where the resonant points are, look at Input and Output at these points.

The problem is all coils will have slight differences in Inductance and so on. 

Also, like the MrPreva Experiment, the Coils will have an optimum configuration, Akula also used a Function Generator to find the resonance point on his Coils also:

 

I hope this helps!

   Chris

 

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cd_sharp posted this 31 March 2017

Hi, Chris!

Do you have a function Generator?

Yes

I would try to resonate the Coils and find where the resonant points are, look at Input and Output at these points.

Do you mean I should put them in a Mr Preva experiment schematic and find the "magic" frequency? This depends on the value of the capacitor also, right?

Chris posted this 31 March 2017

Hi Cd_Sharp - That's just what I would do.

The Coils are where we need to concentrate, looking at the Current Directions at the same time. Ensuring we have met the requirements needed to "Generate" the excess Energy we are looking for.

It may be the Core may need to be changed? I have found some cores better than others? 

Just trying to help, hope you don't mind me pointing out these things.

I posted this to My Replication.

All the best

   Chris

 

Edit: Sorry, your question on the Capacitor, normally: f = 1 / 2 PI Sqt(L C)

But in this situation, you will find, this is not so important, the capacitor is just acting as a Reservoir and the Resistor's R1 & R3 is used to take the square edges off the DC Switching. 

 

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Chris posted this 01 April 2017

Hi Cd_Sharp - I should say, Load is important. This depends on the device as to what is meant by this. But basically, the Resistance of the Load along with the Resistance of the Coils (NOTE: Resistance of the Coils changes during Operation) determines the Current that flows in the Coils.

The Current that flows in the Coils IS the Magnetic Field, calculated as: B = µ0 I N / L

So, the very flow of Current (I), through Turns (T) at Length (L) with Permeability (µ0) determines the Magnetic Field (B)

Electromagnetic Induction states that the Magnetic Field B and the density of it is a dependant value of Electromagnetic Induction: E.M.F = dPhiB/dt

So there is a little bit of fiddling, getting the right Load, making sure the Magnetic Fields are as high as you can, but not saturating the core.

I hope this helps!

All the best

   Chris

cd_sharp posted this 01 April 2017

 Hi, Chris! I used your schematic, this one:

with the only difference that I used 2200 uF electrolytic capacitors and ultra fast diodes.

First I used the U+U ferrite cores shown in the previous posts. I swept slowly the entire range 3khz-65khz with sine wave input and I saw no magic frequencies. In the process I burned 2 LEDs. Then I switched to a 1.2 W light bulb.

I changed to E+E ferrite cores and and I made 15/45 turns. The ferrite is 3F3 and has a bigger inductance factor than the U cores(which are 3C90):

Again I tried to find any frequencies where the input drops and the output grows or at least stays the same with no success. Then it struck me a question: if there are 15 turns in the primary and 45 in the secondary, why do they look symmetrical(also in the VTA they look symmetrical):

I guess the secondary is wrapped first and 30 turns are placed on a core piece and 15 turns on the other core piece. Then the primary 15 turns are wrapped on top the existing 15 turns of the secondary. What do you think, should I give it a try? Any other ideas what I did wrong?

Thanks

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Chris posted this 01 April 2017

Hi Cd_Sharp, Very Nice!

I think that the Currents in the Coils, the Magnetic Fields, are not opposing maybe? Can you check with a Scope?

I have a small Measurement Block I use, similar to the last ones I showed prior, but this is only to measure Currents:

 

With these, I can monitor the Currents in the Coils all the time. I can fiddle to get the best result. Maximum Current Amplitudes are about where the best results are obtained.

The Metal Strip Through Home Resistors are 0.1 Ohms (0R1) and are pretty good for this sort of thing. Very low Circuit impedance, but still sufficient to make a reasonable good measurement.

Recently, I did some experiments, where I had trouble getting the Currents to oppose, something very odd going on, I will show more on this soon. Electromagnetic Induction is Equal and Opposite, this is Lenz's Law, it is built into Electromagnetic Induction and will never change, so I need to try to explain why sometimes we don't get this Opposition!

Re Symmetrical Coils:

Yes, you can have Symmetrical Coils and because the Magnetic Field is NI/L the Field is Symmetrical with the Same number of Turns (N) and Current (I)!

But, please remember, if there is a situation where you use Symmetrical Coils, equal turns on each Coil, then there is always an offset of approximately 1/4  to the turns on the Primary, or Input Coil. Don Smith shows this very Clearly:

 

 

Don's Turns:

  • L1 = 4 Turns
  • L2 = 16 Turns
  • L3 = 16 Turns

Don regularly terms the Output Coils, Partnered Output Coils as a single Coil, normally only using the L2 label. I have found it best to deem this Coil in Two Parts, because each part of the Coil has two different functions.

I hope this helps

   Chris

 

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cd_sharp posted this 04 April 2017

I did some more work on the coils, I have 160 turns in secondary and 51 in primary on the U+U cores:

Although I understood that wire wound resistors are not good for current sensing, I did a preliminary measurement until my precision shunt resistors will be delivered. I played a little with the input frequency and at about 18.48 KHz a strange noise appears and a strange signal shows up on the scope:

Chris, I guess this is what we are looking for, right?

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cd_sharp posted this 04 April 2017

Another thing I noticed without having a sensing resistor is that the power consumption of the circuit drops significantly having the LED on at about 29.5 KHz input frequency, but if I cut the input power, the LED turns off.

Chris posted this 04 April 2017

Hi Cd_Sharp - Excellent Work!

Viewing the Current Wave Form as you are, is handy to see where Current Wave Forms that are not your Input lay. That's right, this is the Goal! We want a Our Input Single Pulse to be seen, and then a Secondary Pulse or a series of them by means of Electromagnetic Induction!!!

Now all you have to do is isolate where these pulses are coming from, making sure its the Coils and not the Sensing Resistor or anything else. 

By viewing both Coils at the same time, with two sense resistors with the circuit above also helps. We should see Ecual but Opposite Currents, then we know we are on the right track.

Excellent Work!!!

All the Best

   Chris

 

 

cd_sharp posted this 11 April 2017

Hi, Chris! I finished up the current sensing PCB. From the following pictures I believe that the voltage drop on one resistor is positive and the voltage drop through the other precision resistor is negative. I think this means the currents go in opposite directions, right? It's what we need?

 

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cd_sharp posted this 12 April 2017

My current setup resonates at 198.4 kHz. One problem I see is that the light emitted by the LEDs is not very stable. Any advice on this? I'm thinking I'm ready to build the full circuit. What do you think?

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Chris posted this 13 April 2017

Hi Cd_Sharp - WOW Excellent Work!!! Sorry I have been busy the last few days.

I think you are showing excellent results! You have proved several things, things that many others have trouble with.

  • Currents are Opposite, 180 Degrees out of phase!
  • Lighting LED's when in Resonance! A Load!
  • The basic Circuit works as we have shown!

Maybe try pulling more load by adding LED's and see what your Input Does? I would learn as much as possible here before moving too much further.

Ideally you want the input as low as possible. This may mean adding a few more turns to the big coil. By experimenting with these two parameters, Load and Turns vs Input Current this should show a lot!

CD, this is awesome work! You should be very excited! This is ground many cant get to!

All the best,

   Chris

 

P.S: Your Input, is it a single Pulse as I expect it is? DC Pulse to the Fet?

Chris posted this 13 April 2017

If I may suggest, look at your Gate on your Fet with one of your Probes. 

Make sure its turning off properly. It likely is, but worth checking. Then look at the Time of your Input Pulse vs your Output.

The goal if to maximise the total Electromagnetic Induction, for no extra on the Input.

You should get 2x Electromagnetic Induction at the Cost of 1x - This is the Action Reaction then Counter-Reaction thing.

   Chris

 

P.S: Aim to maximise the Electromagnetic Induction you already have going on.

cd_sharp posted this 13 April 2017

Thanks for all the help. I use a sine wave DC input through a power amplifier circuit. I will be back with some more data.

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Chris posted this 13 April 2017

Hi Cd_Sharp - Ah ok, yes I see. Try adding the Fet, use a Function Generator to pulse it. You will likely need the resistor, this will reduce the sharp DC Gradients/Pulses on the Coil and help to smooth, Sine as you have shown. Try different values, 1 Ohm, 0.22 or so. Same as on the schematic ( R1 and R3 ).

You should see a DC Pulse input and a Pulse Output which is Free - I have shown this many years back here: My Early Work

Excellent Work!

   Chris

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