Bigmotherwhale's Non-Inductive Coil Experiment

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bigmotherwhale posted this 15 November 2022

Hello 

I hope its okay to post here, I have just signed up to this forum, I dont usually post on forums like this because the level of confusion and invented overcomplication clouds my mind.

I have been doing some experiments with SERPS which led me onto Pavel Imris and his reactive power transformer which is also non inductive. I was then looking for the mechanisms which the electric field interacts and i eventually stumbled onto here, there is a goldmine of information here. 

Back to the topic at hand, I have a small opposed coil inductor fed from a third coil, i have it setup driven from a mosfet and a power supply with a signal generator. 

The output coils are two automotive bulbs, I have it so if either of the output coils are disconnected both bulbs go out. 

I would like advice on what the output current and voltage should look like ideally on the scope. 

Thank you. 

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Chris posted this 16 November 2022

Hello and Welcome BMW,

I hope you don't mind the abbreviation? Also I moved your post to its own thread, to help you along!

This thread will help you along I believe: Chris's Non-Inductive Coil Experiment

Of course all experiments and geometry's are different, but the end goal is The Sawtooth Waveform to make this useful!

We have a thread: Builders Guide to Aboveunity Machines which will also help!

You are safe from Trolls here!

Best Wishes,

   Chris

 

bigmotherwhale posted this 16 November 2022

Thankyou, Im getting some strange results, im having trouble determining the direction of the diodes, Is this what i should be getting across the coils? the lower waveform is the gate trigger for the mosfet driver. Im using 3 coils wrapped on an E-core from a PSU, 10 turns each counter wound each side of the core and one 8 turn over one side of the coil. The output pulls a very small but intense very deep blue arc that is very "snappy"

 

Chris posted this 16 November 2022

Hello BMW,

This is fantastic work! Very nice to see such progress!

To me it looks like you have everything correct! The only thing I can see, is the Scope shot is either inverted of mirrored somehow?

Study closely all aspects, of what you have, especially where each Partnered Output Coil Slaps together.

This point, where peak Voltage and Current amplitude is achieved, is where you want to maximize the assistance you achieve from one of the POC to your Input Coils.

This part is Important and needs special attention! Also it helps with Tuning to closely observe this area.

Best Wishes,

   Chris

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bigmotherwhale posted this 16 November 2022

Thanks

It could be connected backwards across the resistor? 

I realised that I had the whole setup connected together in series rather than a bulb to each side, my bad.

The interesting part happened when I was connecting the scope, the ground connection made a squeaky spark and the bulb increased in brightness quite a lot while consuming about 2 watts more power from the supply. I tried again with the coils separately powering each bulb but nothing happened when connected to ground. Im not really sure what was going on. 

Im not all that happy with the coil, the frequency is very high and it really hurts my ears. 

Im going to wrap another inductor with some finer gauge wire and see if the higher inductance makes it easier to drive, the mosfet is getting quite hot it really cant cope at this frequency (and hopefully it will be a bit quieter) 

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Chris posted this 16 November 2022

Hi BMW,

Re:

The interesting part happened when I was connecting the scope, the ground connection made a squeaky spark and the bulb increased in brightness quite a lot while consuming about 2 watts more power from the supply.

 

Yes please be careful, Ground Loops can damage equipment, this sounds like a ground loop. Please be aware of this. Disconnect immediately and double check connections.

Yes, more turns can make a difference, but you don't want too many turns! This makes the Impedance too high and some functionality is lost.

Best Wishes,

   Chris

 

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bigmotherwhale posted this 16 November 2022

The two secondaries are isolated from the primary by 31 megaohms measured with dmm, listen to the buzz when it touches the pipe, if there are no other connections to the coils, where is the loop?  Your guess is as good as mine,

Chris posted this 17 November 2022

Hi BMW,

Great Work! Thank You for Sharing!

Simple Things Yield the greatest results! Yes a Ground connection can improve the Output, and sometimes drop the Input, however in your case we see it increase slightly.

I recommend further study of your current success to further understand what is working on the bench! This will give you a much greater understanding of the whole phenomena!

Where you are right now, is further than majority of the Community has ever come! Take advantage of your success, and study further to increase your own personal Knowledge! if you continue, it wont be long and you will be able to run your own Home from your Machines! This can be in your future! As it can be in anyone's!

 

You already have The Sawtooth Waveform!

If you have your polarity's correct, and your device is running as it should, you are Light Years further ahead than the Other forums already! As are We!

We will continue to help!

Best Wishes,

   Chris

bigmotherwhale posted this 19 November 2022

Was getting fed up with burning diodes and fets trying to drive the other core i made, it seems to like being loaded down really heavy for it to work properly and the inductance was so low the frequency was unrealistically high. I need to rethink its design. 

I had a play with a ready made filter straight out of a power supply, burned out MBR760 for scale. 

Got some pretty good results with much lower power and frequency that is easier to work with. 

running the two windings in anti series if that makes any sense, With the fet driving the first 

Getting this waveform, its phase shifted to the middle of the deadtime and can be turned down to a very small duty cycle. 

this is the width of the pulse that is below the measurement range of the PSU, the higher width gives 2ma 

im driving some LED strings 16v in series with 1000uf cap. Shown here @ 0.002A

when you turn off the power completely even the switching, the core is picking up background noise.  

Interesting for something with so little effort. 

Jagau posted this 19 November 2022

Hi Big Motherwhale
when you say I'm tired of burning mosfets
do you need help improving your power system?

Show me yiur circuit and I'll suggest how to protect them

Jagau

baerndorfer posted this 19 November 2022

i like when someone can focus on things that are unseen by many others. knowledge comes from trying things out. 

i have no idea what capacitor you use but i find these WIMA FKP caps very useful. connecting led's in series should help bringing the load impedance to a higher level. maybe you can gain more output who knows 😃

regards

B

bigmotherwhale posted this 19 November 2022

Yes some help with FET protection would be helpful, Im using a HCPL3120 driver isolated with a dc dc converter, I have a neon bulb as a clamp and a snubber circuit with 100n and 7 ohm across DS which is probably too low impedance for HF.

At the moment im using cheap, what looks like recycled aliexpress FETS, they have a weird mark on the legs where it looks like they have had the legs spot welded back on!? Im not too bothered at this stage i will use genuine when everything is in order. 

I have my own capture circuit for driving that charges a capacitor up from any rebound from the coil, Im not using it right now as i dont want to overcomplicate things. 

The surprising thing is the diodes failing, they really must be getting a pounding, i have switched to higher rated versions doubled up. 

Im not sure how different capacitor will help, can you explain? 

I tried another filter core similar but bigger and i got the classic saw wave very easily, didnt see any output improvements compared to the first but it was a flat triangle with a little blip at the top. 

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Chris posted this 20 November 2022

Hi BMW,

We have many threads here on this topic already:

 

And more, but they are perhaps the better ones. It is worth studying this in some detail, as it will help you progress at a much faster rate!

Also, Measurement is worth studying:

 

The correct, true and correct Measurement Methods have been blurred beyond any sort of clarity by Others!

We have the Best Measurement Standard of any Forum in the World! We have a First Class Protocol that very easily proves the Trolls completely Wrong and Totally Incompetent!

When we measured Captainloz for the first time, he had a working machine, and we got very good measurements, then he thought the Scope was bad, so he replaced it, and we got the very same result, well Above Unity, which is easy when one knows what they are doing!

Many have assumed they have nothing, but when they apply Our World Leading Measurement Standard again, they very often have a Machine that shows very good results! It is very easy for those wanting to fail, to fail, but there is more, when Correct and Proven Technique is applied! Only Good Genuine People apply the True and Correct Technique!

Best Wishes,

   Chris

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Jagau posted this 20 November 2022

Hi BMW

You said

 I have a neon bulb as a clamp and a snubber circuit with 100n and 7 ohm across DS 

In a Transistor, (BJT) your connection is often used, it is not advisable to use this type of protection with a Mosfet.
If you use a 10k discharge resistor between the gate and the source your gate will be well protected if you use a neon your gate is only discharged from 70 volts andmore, which drives your mosfet well before 70 volts and burns it.

A BJT is controlled by the current between the emitter base, a Mosfet is capacitively controlled only with the voltage, (0 to 1 5V) no current on the gate only a few UUa so you have to be sure to discharge the gate when there is no pulse, otherwise your mosfet will run at full speed and burn. So added a 10K between the gate and the source you will solve many problems.

In addition we use a snubber when we want to protect Mosfet from the BEMF in our case here we use the BEMF to our advantage. unless you don't want to use it, it's up to you
Jagau

bigmotherwhale posted this 20 November 2022

I'm using a gate driver for the mosfet, it is in push pull configuration, there is no real need for a pull down resistor 10k to pull the gate down it is only there to stop rouge conduction when the circuit is powered up, there is only a low value series resistor to limit the current flowing into the capacity of the gate. The gate is protected to source with an 18v zener diode. 

The Neon is across drain source, not the gate, it does not have a value until the voltage reaches 60v and after breakdown it conducts heavily, My mosfet is rated quite a lot higher than 60v. It is no different from any other protection device, i don't see how that would burn my fets.  

I think the real problem is that these Chinese copies cant keep up, they are too slow and under rated for current, they are possibly too high RDS and i should go with a lower voltage higher current device with a smaller gate charge, or possibly multiple devices. 

What i haven't calculated is the RC snubber network, i just pulled some values out of the air, I could do with help there. 

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Jagau posted this 20 November 2022

Ok very good with a mosfet driver, when I asked you for your circuit you answered me with a neon and nothing else, so if I had known right away that you had a driver it is certain that I would not have done you this answer.
Jagau

bigmotherwhale posted this 20 November 2022

I did say, see above " Im using a HCPL3120 driver isolated with a dc dc converter" Thanks for trying to help tho is appreciated. 

bigmotherwhale posted this 20 November 2022

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bigmotherwhale posted this 20 November 2022

New Core with higher inductance secondaries and a new geometry, reduced snubber cap value to 10nf, shown here with pure resistive load + TVS, transistor still mediocre, measure gate charge and its 3x lower than datasheet (fakes) explains why im seeing heating and failure when it shouldnt be close to ratings. 

Have tried using led strings as loads and does essentially look like this but the scope isnt pretty. 

I have an idea for a new config of mosfet switching that should give higher dv/dt 

Chris posted this 20 November 2022

Hi BMW,

We do not use Snubber Circuits, its an Input Coil Thing, looking for the return Energy back to the Source, a big UF Diode is all you need.

All you need do is redirect this "Reactive" Energy back to the Source:

 

When your Input See's No Load, and you have an Output, then you have Success! The Links I have provided will steer you in the right direction 😉

Best Wishes,

   Chris

bigmotherwhale posted this 21 November 2022

The example on your switching page has a snubber across the mosfet, is this no longer recommended?  

I do have a diode across it as well. 

I can put varying loads on the output while its running and the input doesn't change at all, I was surprised this was so. I don't know if the output increases or the voltage drops but they seem independent.

Should both coils be the same inductance or is there any benefit in having a difference between the two?

Chris posted this 21 November 2022

Hello BMW,

In the Link: Reliable and Flexible Switching System

We do use a Variant of this circuit:

 

But we do not use the Snubber Circuit: R7 and C8

 

We only use the big Diode: 

 

You can see, it is omitted in the Circuit given! All this, very same data, is given on the Link given.

The Gerber Files are also given freely on the same page.

Best Wishes,

   Chris

bigmotherwhale posted this 22 November 2022

Back to using a snubber of sorts, a bulb and a diode which is what i had originally, Without it the output voltage is reduced and the "acceptance" of the core is changed or somehow biased. I don't understand it fully, maybe someone can explain? The switching is also alot cleaner. Without it may work for large cores with lots of turns but its just not feasible with a small ferrite. 

now using the same core as before but re wrapped with more turns and a 1/4 wave primary. Its free to move on the core to the best location and it seems to want to be off the end of the core as far as i can tell, i will try this. 

best i can do is 3x 21w automotive bulbs lit to half brightness with an 18w input, when its more impressive I will take some readings. 

Will try using two different sized secondary coils and one of them is always producing more than the other and seems to be mismatched. To get the best effect and sustain the sawtooth i need to load down one core a lot more than the other. 

I wonder if this is why don smith has a cap across one of his coils. 

 

Chris posted this 22 November 2022

Hi BMW,

Your Comment:

secondary coils and one of them is always producing more than the other and seems to be mismatched. 

 

There are three things you need to do to fix this:

  1. Tune, adjusting Frequency and Duty Cycle!
  2. Input Amplitude adjust, very slowly go up until you hit Magnetic Resonance!.
  3. Load Impedance needs to be right to make this work correctly! Adjust your Load, adding or reducing until you hit the spot where your machine likes to run just right.

 

A little bit of fiddling is required here!

Best Wishes,

   Chris

bigmotherwhale posted this 23 November 2022

Not sure where the ideal load  is exactly i just connected a 240v 400w floodlight to the output of the coil and it lit up 1/4 - 1/2 bright at  guess, input power went up to around 70w so i have a boost converter at the least. 

I have tried as narrow as my setup duty cycle will allow all the way to 50% duty and from 10 - 100khz and i cant find any particular sweet spot. 

I did try shunting with some TVS for delayed conduction but as my output looks alot higher in voltage it seems the low voltage ones i have 6.8v probably wont do.

I had another TVS rated for higher voltage on connection it got very hot and inflated like a balloon 🤣 

is it better to shunt one of the coils completely and run a load from the other or is it better to run the coils in series through a load? 

What are your thoughts on mosfet or SCR output triggered from either voltage or inverted duty cycle? 

Kind regards. 

bigmotherwhale posted this 24 November 2022

I have learnt a bit from this coil but im limited in measurement, and my switching and signal generator is less than ideal, looking at the rise and fall on the scope its a real mess, so much ringing going on during switching, the initial pulse is still quite fast but i think it needs improvement, The issue that im having is that its all largely dependant on the operating conditions of the fets, the rise and fall time is the only factor, frequency can be anything as long as it doesn't occur too soon that you are wasting the energy of the saw. The voltage is also wanting to be much higher, you could really drive this thing hard, i think the power of even something this small could be over 400w looking at how it was able to power a floodlight. I suppose its not al that surprising considering it is taken from a PC power supply. This all makes measurements more difficult, and finding the fundamentals is more important. 

 

I may revisit but for now im going to look into a LC resonant system. I wouldn't like to speculate if I achieved any energy gain but i have been able to learn what it takes to take any pair of cores and get them to produce the sawtooth, it was in fact stupidly easy get the wave using an off the shelf EMI filter choke, the best one I tried was a low profile one that had very flat coils sandwiched together, powering leds with this setup was amazingly efficient, the current goes so low it didn't read on a mA scale on the power supply I was using.

I decided to try using some AM radio ferrites and a pair of 1mh coils with some parallel caps, and using a sinewave set them in resonance. They are wound the same direction facing the same direction, I am looking at detuning one of the coils to create a phase shift so that they either attract or repel, and then see the effects under load. 

bigmotherwhale posted this 25 November 2022

Looking around for simple timming options, I couldn't find much that was easy and simple so i made my own based on Arduino. 

Basically a re write of a program I used to control a SERPS device 

Takes a TTL clock signal and gives two output pulses delayed apart with adjustable duty cycle. Uses pots for ease of tuning.  

I haven't tested it properly yet, you may need to configure the timing in the code to suit your needs. 

Zero_cross_delay_conduction 

Feel free to use it, might be easier than a 555 timer

Chris posted this 25 November 2022

Hi BMW,

The best investment I ever made was in a Rigol DG1022Z 25 MHz Arbitrary Function Generator:

 

Two channels of pure awesomeness here!

Best Wishes,

   Chris

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bigmotherwhale posted this 25 November 2022

Yes quite the investment! 

I tried using the Arduino and it was very limited, more limited that i expected, it tops out at about 1khz, it was originally designed for 50hz so thats not really surprising.  

It did allow me to do some rudimentary experiments, shifting the output phase, and watch the input current draw go down. 

The coils have a reaction against themselves unloaded, which would only be expected if they were considered an antenna and receiver i suppose.

Does anyone know of any simple Arduino programs that would help? there must be some kind of function generator program that does what I want out there. 

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Jagau posted this 25 November 2022

Hi BMW
an exceleent oscillator made that I use very often.
It is versatile with variable freqemce and DTC, very easy to do with IC TL494

https://circuitdigest.com/electronic-circuits/pwm-inverter-cirrcuit-using-tl494

I think Islab is using this oscillator too
Jagau

bigmotherwhale posted this 27 November 2022

Thanks for the suggestion but i already have a sig gen, my old Tektronix is broken so im using a basic model, its not very good tbh.

Im looking for a 2 channel variable phase and duty cycle generator for delayed conduction experiments. 

my Arduino code was a failure, it did work much better with only one output delay and i don't need to use the interrupt i don't think. 

for someone who knows what they are doing with the code it should be really simple to do even for 50khz im sure

bigmotherwhale posted this 30 November 2022

bigmotherwhale posted this 01 December 2022

Looks good but it was a failure, the input output coupling is very high and the power output is low, and it stinks of ozone, there is a constant hissing sound coming from it. if you disconnect the output completely the output coils are literally enveloped in a purple corona, no joke. I dont imagine my equipment would be too happy with this voltage surrounding it so killed the power asap, there is no direct connection between the core and the windings which are wrapped on the insulating bobbin, they are in a stepped configuration, every layer has capton tape between it. 

bigmotherwhale posted this 01 December 2022

New throw together, showing some promise. 2.35w 

bigmotherwhale posted this 02 December 2022

I have had a play with the coil, its a bit strange, the input coil is very ineffective at coupling with L2 L3 in both directions, so much so that much of the energy comes back out again, to solve this is put a capacitor across the primary and put it into resonance which did work but its not ideal, I think im approaching unity with this transformer, it requires a heavy load on the output to work properly, Im using a H4 headlight bulb on the output probably 60 watt rated i think. with 16w going in it lights the same as when i have the PSU directly connected to the bulb delivering 16w, it needs more windings but there is just no space not to mention the difficulty in winding.

The output is a triangle wave without diode, very symmetrical.

Chris posted this 02 December 2022

Hi BMW,

It is great to see progress!

If I may, Voltage is the product of: ΔB / Δt, which is Faraday's Law of Electromagnetic Induction. In other words, BMax - BMin / tEnd - tStart is equal to the Voltage. The Equation is actually a little more complicated than that but you get the idea! We have the detailed Equation in our App: Aboveunity.com Member Calculator

 

In this App, you can see that the Area is also included, this is to fit more Magnetic Filed Lines inside the core, which is important.

If you're happy to use High Frequencies, then this is not so important, and the same sorts of effects can be seen at these higher Frequencies! However, as Frequencies get Higher, its MUCH Harder to tune these machines because of FG Resolutions dropping off so quickly!

It would be great to see some scope shots, as I believe they show in what direction you're heading. Continuing to see the Sawtooth Waveform, with input Freq and Duty Cycle,  would be great!

If is entirely up to you how your proceed, all I am trying to do is point out some of the hurdles I have seen myself.

EDIT: Also, your Input Coil is only a Catalyst, so it does no Work! Your Partnered Output Coils must do the work!, Let them each work Oppositely, but ensure your Polarity is changed to make sure the Charge Polarity is the same. 😉

Best Wishes,

   Chris

bigmotherwhale posted this 03 December 2022

but ensure your Polarity is changed to make sure the Charge Polarity is the same.

 

 

Yes I did consider the polarity,  I pondered which way to wind L2 L3 as obviously the magnetic field is reversed on one coil as opposed to a looped core, are you suggesting they should be wound in the same direction, reversed electrically or the primary wound in two directions? the latter probably not viable..

I can get some scope shots, its not the easiest to do with analogue scope for obvious reasons, I didn't want to spend too much time on this as it was only a test of some ideas.

Oh i think the bit about induction calc might have been related to the picture of the primary, it was on there originally and was re wrapped soon after.

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bigmotherwhale posted this 04 December 2022

You asked for scope shots, this is with a diode in dc mode under low power with no cap on the input or output. 

Under high power it looks like this, not really sure what is going on here:

Chris posted this 05 December 2022

Hey BMW,

Thank You!

If I may:

First, you have done a lot of work to get to where you are, well done!

Second, you're not in an totally ideal situation, even though things look very promising! The Ideal situation is pure DC on the Output for the Most part!

Why I say this, Charge is the constant that needs to be treated as a Vector, having both Magnitude, Voltage, and also direction. Static Charge is Voltage, Non-Static Charge, or Dynamic Charge, moving, having a Velocity, is Current.

Again, One Ampere is 6.241509074×1018 Elementary Charges per Second, past point TPositive, so making sure we amplify this Quantity in the Cycle we have is Important. Each DC Cycle, multiplied by two, with Alternating Polarity, then becomes AC Current, so realistically, we need to start at the first part of the Cycle, in the initial DC Range of the Cycle.

As we Pump Charge at a Higher Rate, the Charges flows through the Load at Higher Rates and we have more Power in the Load for the very same Dynamic Forces.

These Dynamic Forces reduce the Input to almost Zero, in each DC Cycle, which is what you see, however in an AC, non-uniform Cycle. With Voltage oscillating as it is, one can not see what is actually occurring.

Turn this:

 

into this:

 

is the start to making an AC System, but one must start at the start before finishing the race! Again, AC is made up of two Alternating DC Cycles.

This quantity is what we need to focus on amplifying!

I hope this makes sense?

Sorry for the long editing time as I was called away to attend to important matters. 

Best Wishes,

   Chris

bigmotherwhale posted this 05 December 2022

I can get the sawtooth wave to appear at will with a slight change in duty cycle or frequency, what is this ring down im seeing and why does it go through my diodes like they weren't there, the bottom picture shows that half the wave below midpoint, its gone through two diodes to create that reverse current, How? 

If i measure the inductance of the two output coils in series i get zero uH, so the frequency would be very high! higher than im seeing here in the ring on the top picture, are these waves in the core material?  

This coils behaviour is weird, as you can see in the first picture the bulb on the right is a protection device it turns on when the fly back energy captured in a capacitor reaches a certain voltage stopping my fet from going over voltage, with other coils it comes on when the output is unloaded, with this coil everything that seems to go in seems to come straight back out again. 

My second question is to do with magnetostriction and its requirement. 

I have some Sendust cores here that i was thinking of trying, they have very low magnetostriction. What's the effect of using something like this as opposed to these cores I have that squeal. 

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bigmotherwhale posted this 05 December 2022

If the applied magnetic field is alternating in nature then the rod or tube placed in the field will contract and expand alternately with a frequency that is twice the frequency of the applied magnetic field.

ULTRASONICS

"In these materials the application of external mechanical stress induces a change in the level of magnetization and therefore an electromotive force (emf) can be generated and collected in order to produce electrical energy. In magnetostrictive materials this effect has been theoretically and experimentally confirmed in metglas [5], Terfenol D [2,3], FeGa and several other alloys."

It seems to me that what we are trying here is the interaction between counter rotating gyroscopic "electrons" resulting in the low opposition to deflection (inertia) and a resonant magnetostrictive effect. If this were true then these coupled effects would be present along the length of the ferrite and ideally we would have two octaves of E and B interacting. 

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Chris posted this 06 December 2022

Hey BMW,

All very good questions!

First Question:

what is this ring down im seeing and why does it go through my diodes like they weren't there, the bottom picture shows that half the wave below midpoint, its gone through two diodes to create that reverse current, How? 

 

Diodes have a specific operating condition, the conduction of the diode is controlled by Voltage right?

If one has a Positive Voltage, but a Negative Current, then the Diode will Conduct at it's Operating Condition, but the Power the Diode "see's" is different. So, under specific conditions, the Diode will conduct, but the Power is different, so it appears unusual.

Second:

If i measure the inductance of the two output coils in series i get zero uH, so the frequency would be very high! higher than im seeing here in the ring on the top picture, are these waves in the core material? 

 

We covered the Inductance issue in the Thread: Non-Linear Inductance

The Inductance of any Coil is defined by the amount of Current that can Flow in the Coil:

L = ε / di / dt

 

My opinion, Inductance is a very badly understood subject in general, across the board. Even experienced Electrical Engineers do not understand Inductance very well. They may be able to do all the math, but if they are asked the hard questions, like we see every day in these machines, they are totally lost!

In any Energy Machine, we want, ideally, the Lowest Possible Inductance, this allows for a much greater Volume of Current to Flow! In any "Generator" we see the Inductance drop, with Current Draw!

No one ever covers the fact that Magnetic Effects vary on the Square of the Current. This means, if the Current changes, then the Inductance must have also changed! This is why we see Inductance Meters operate at a specific Frequency mostly!

Floyd Sweet said:

These measurements indicate that field intensity is directly proportional to the square of the current required by the load placed on the device. This is due to its proportional relationship with the virtual value of the magnetic field which theory states is proportional to the current.

 

This means, the Energy Density of the Magnetic Field is:

 

Energy Density =

The Energy Stored in a Magnetic Field is E = 1/2 LI2

 

However, Floyd Sweet is saying that the Magnetic Field Strength H, is proportional to the Current Squared, I2, for a given Inductance, which is the same as saying: H = L / I2. Now do we see this theory anywhere? No, its a very illusive and mostly ignored subject! Theory says L = N ΦB / I. We see a hint of this in the Ohms Law equations for AC:

 

 

In this diagram, we see: Power P = Current I2 x Impedance Z. With some creative math, we no doubt will see some more direct relationships! If anyone wants to step in and point these equations out?

The unit of Magnetic Field Strength ( H ) is A / m or Amperes per meter. Another equation is: H = I / 2 π raverage. Thus the Radius r, becomes another factor for the Field Strength H.

Sorry for this Rant, its mostly not relevant!

Best Wishes,

   Chris

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donovan posted this 06 December 2022

Hi,

Just thinking about the "ring down" that goes right through your diodes.  You mentioned, no capacitors in the circuit.  Could it be as simple as, the diodes are forward biased at this time, (low impedance) and the smaller AC ringing simply walks through.

Similar to a diode being used as an RF switch, in RF circuits?  That still leaves the question of where the ringing comes from.....

Donovan

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bigmotherwhale posted this 06 December 2022

I did look into that as a possibility, the scope says the centreline is 0volt but that may not be accurate.  obviously there is capacitance and inductance and they are not balanced hence why im getting a resonance rather than the cores opposing each other like they should, its a shame I cant get both because the power draw is always lowest under these conditions, and the current in the load is real.

The wave is across a 0.2ohm resistor and the scope is set to 0.5v per div, meaning about a 5 amp peak, If i worked that out correctly. quite a jolt to the diode, and this is with 0.000A showing on the supply.  

 this is the problem of using smaller ferrites at higher power with low inductance, the frequency is high and the currents are big. 

I have a cheap second hand amorphous core on order, I imagine it will be easier to work with. 

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bigmotherwhale posted this 06 December 2022

I did some experiments to look into magnetostriction.

I setup a simple oscillator with a transistor and using both a piezo and a coil as a pickup compared the audio output to it.

 

Top is coil.

The highest signal from the coil was in between the two coils at 90 degrees. 

moving the coils didn't alter the frequency significantly, but placing a short across the ferrite with a coil or putting a ferrite on the end did. 

The ideal 90 deg placement of the coil pickup suggests a magnetoelectric effect? 

The ring im seeing in my earlier experiments looks very close in appearance and frequency to what im seeing here.

What do you guys think? 

 

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