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Author Topic: Kapanadze Cousin - DALLY FREE ENERGY  (Read 8447908 times)

Offline itsu

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Re: Kapanadze Cousin - DALLY FREE ENERGY
« Reply #10845 on: October 15, 2015, 07:16:23 PM »
Hoppy,

i tried that, but the basic 50V square wave pulses stay, but the ringing now is much worse, peaking 110V  :o

So it seems it (with the UF4007's and C24) is doing its work as a snubber ok.

I changed the transformer into 2 resistors (190 Ohm each) fet in the middle, and now the MOSFETs do what they suppose to do, see screenshot
So its something with the transformer used, both input coils are about 55uH


Regards Itsu

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Re: Kapanadze Cousin - DALLY FREE ENERGY
« Reply #10845 on: October 15, 2015, 07:16:23 PM »

Offline Tomtech29

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Re: Kapanadze Cousin - DALLY FREE ENERGY
« Reply #10846 on: October 15, 2015, 08:05:04 PM »
Hi.
Itsu you have a lot of facilities to hold on to so tightly scheme This is a very good and reliable the devil is in these shoes (KIT)
keeping in such and no other although it was to prove that the plan is with errors that you can see it on a plate
as they go work on a push pull system I do not know what you are missing almost already you have the full set?

I would like to see how the control system operates with the possibility of phase shift on one channel or will be any difference whether the transistor to heat up more?
Here is a simplified version of 50/50% push-pull if someone wanted to try based on the same driver but that's another story
- you believe that this transformer step-up must be necessary for the elevated frequency up to 85Khz I use PWM to limit the voltage at the input where you specify 24Volt the frequency of 35kHz it probably does not matter that much as 130V DC power supply to power Kacher
This single pulses give the frequency and length of the bell

Offline Dog-One

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Re: Kapanadze Cousin - DALLY FREE ENERGY
« Reply #10847 on: October 15, 2015, 10:22:13 PM »
So it seems it (with the UF4007's and C24) is doing its work as a snubber ok.

I changed the transformer into 2 resistors (190 Ohm each) fet in the middle, and now the MOSFETs do what they suppose to do, see screenshot
So its something with the transformer used, both input coils are about 55uH

Welcome to the jungle Itsu.  Smart detective work using a resistive load to verify proper circuit operation.  I had the same trouble with my PWM board I posted a while back.

Two things are going on here.  You are getting BEMF and the snubber is doing its job protecting the MOSFETs.  The resistor is probably dissipating a fair amount of heat.  The ringing on the square wave is a clue.  That ringing tells me you are likely saturating the core and there are at least two factors involved:  The amperage switched to the primary and the dead-time between switching--either one will make the core misbehave.  If you have big capacitors holding the rail voltage up, you will have big current traversing your MOSFETs when they turn on.  Think of the primary and core as a simple inductor acting like a water tank--you fill it too fast and it will pressurize itself.  Your rail caps are responsible for this rapid filling.  The second thing is your frequency and dead time.  You have to allow enough time for the magnetic field to transfer into the secondary; if you don't, that energy will push back out the primary, hence the snubbers.  Also keep in mind if no current is exiting the secondary, as would be in the unloaded case, that energy has to go somewhere, which would be back out the primary.  I recommend making sure you have a lamp or something connected to the secondary that simulates the approximate power transfer you actually need from this inverter.

Now, what Nick mentioned about the Mazilli for this application is indeed brilliant because it automatically allows the transformer to run at its optimal frequency.  This is probably what I will switch my inverter to.  Just be sure to either limit the current or bias the transistors so they barely turn on.  Reducing the size of the rail capacitors is a first start or use some resistors between them and the MOSFETs.  The running frequency of the inverter isn't important because we are going to filter and rectify this output back to DC anyway.  Once you have this working, the only adjustment you need to make is the turns ratio, particularly on the secondary, to get the voltage in the range you want.  Again, I would run this circuit under a mild load to verify power transfer.  I think you'll find the circuit to be way oversized for what we actually need from this inverter, which with filter caps and such is probably only a few milliamps of continuous power.

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Re: Kapanadze Cousin - DALLY FREE ENERGY
« Reply #10847 on: October 15, 2015, 10:22:13 PM »
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Offline NickZ

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Re: Kapanadze Cousin - DALLY FREE ENERGY
« Reply #10848 on: October 15, 2015, 10:41:06 PM »
   Hey Tomtech:
  I like your 50/50 PWM push-pull. Can that set up control frequency? Or, only the duty cycle?
  Do you have a pic of your "simpler" version that you've built?
 
   IF I can get close enough to the right combination of coil windings turns and tuning caps. And by adding ferrite pieces inside the grenade core, and inside of the Kacher core, and the magnetite magnet in the yoke, etz... I can pretty much not only control the frequency, but add GAIN to the output, as well.

   I'm about to re-connect my Mazilli/yoke back up to the grenade/Kacher circuits.  And fire it up, again.
Preliminary tests are complete. If I could only remember them.... Ha!
   

Offline skywalker66

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Re: Kapanadze Cousin - DALLY FREE ENERGY
« Reply #10849 on: October 15, 2015, 11:23:59 PM »

All,

question about the DC2DC converter (24V to 130V) as in the red box, see below.

I have found a suitable transformer (SPI 804-2007-35), i think, and hooked it up, but the output voltage was way to high (600V pp).
Measuring the input from the both IRF540 MOSFET drains (see yellow / blue lines in the diagram), shows
a square wave signal, but at about 74V!!, see screenshot.

Input into the circuit is 24V from 2 batteries in series.


Why do i have 74V square wave signal on the drains?  How to get it back to the required 24V? 


Thanks,  regards Itsu

Hi Itsu!

Your setup work just fine as is supposed  to work.
If you check across each half of your primary you'll notice a square wave of about 24V amplitude which is correct.
As you have has check drain voltage, there is another story. When a mosfer are in conduction you'll get 0V reading,
when not in conduction you'll measure 24V(Power supply) + voltage across coresponding primary which is forward induced by
other half primary which conduct in that period = about 48V.
I hope I managed to clarify that aspect for you.
As for your 600Vpp output, try other pair of primary (coresponding to 12V out if your trafo is from a standard
PC PSU with +/-5V & +/- 12V at the secondary and a common connection for gnd).

Free Energy | searching for free energy and discussing free energy

Re: Kapanadze Cousin - DALLY FREE ENERGY
« Reply #10849 on: October 15, 2015, 11:23:59 PM »
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Offline skywalker66

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Re: Kapanadze Cousin - DALLY FREE ENERGY
« Reply #10850 on: October 15, 2015, 11:58:20 PM »
Itsu,

find a old PC power supply in halfbridge configuration like in attached schematic, get it's transformer, use its 12V outputs legs
 and common as primaries for you and will work. Common you will connect to 24V, and 12V terminals to drains of mosfets.

Good luck !

Edit: As I sugested  above, you'll get about 300Vpp output which at 50% duty cycle means after rectification and filter 150Vdc.

P.S. Sorry for messing this page with large diagram.

Offline AlienGrey

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Re: Kapanadze Cousin - DALLY FREE ENERGY
« Reply #10851 on: October 16, 2015, 01:44:47 AM »
   Hey Tomtech:
  I like your 50/50 PWM push-pull. Can that set up control frequency? Or, only the duty cycle?
  Do you have a pic of your "simpler" version that you've built?
 
   IF I can get close enough to the right combination of coil windings turns and tuning caps. And by adding ferrite pieces inside the grenade core, and inside of the Kacher core, and the magnetite magnet in the yoke, etz... I can pretty much not only control the frequency, but add GAIN to the output, as well.

   I'm about to re-connect my Mazilli/yoke back up to the grenade/Kacher circuits.  And fire it up, again.
Preliminary tests are complete. If I could only remember them.... Ha!
 

Nick your amazing, It was on the Russian site, yonks ago, it's an AFC circuit if the Feq feed back changes the voltage will change ie + or - so it will sort of stablise some what, but you would have to put an extra turn of wire to feed back the F and experiment it's the right way round (in) phase. but use buffers between the outputs and the drains at that frequency or the chip will get hot and blow. You know how to do that don't you ? an npn and a pnp on each driver leg.
View of pcb and underside. This unit is only 12v to 14 at the most regulated the gates are clamped to 12 volt max in this circuit it's been working over a year now from a car battery. The IRF540 only has a max voltage of 100 volt, mine are 1000 volt limit and have internal diodes, with that circuit you back feeding your supply and wasting power and drive.
« Last Edit: October 16, 2015, 10:44:54 AM by AlienGrey »

Free Energy | searching for free energy and discussing free energy

Re: Kapanadze Cousin - DALLY FREE ENERGY
« Reply #10851 on: October 16, 2015, 01:44:47 AM »
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Offline Jeg

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Re: Kapanadze Cousin - DALLY FREE ENERGY
« Reply #10852 on: October 16, 2015, 10:16:31 AM »
Hoppy,

So it seems it (with the UF4007's and C24) is doing its work as a snubber ok.

Regards Itsu

Hi Itsu
Nice work mate! What is the voltage rating of your C24@1uF? What is the wattage of your R27@2.2k? I tried yesterday to use this snubber instead of akula's but it dissipates so much heat that unsolder my resistance which connects the snubber capacitor to the 24V power supply!

Offline Jeg

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Re: Kapanadze Cousin - DALLY FREE ENERGY
« Reply #10853 on: October 16, 2015, 10:26:41 AM »

 If you have big capacitors holding the rail voltage up, you will have big current traversing your MOSFETs when they turn on.

  I recommend making sure you have a lamp or something connected to the secondary that simulates the approximate power transfer you actually need from this inverter.


Thanks for the tips D1!

What capacity do you recommend in parallel with the power supply?

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Re: Kapanadze Cousin - DALLY FREE ENERGY
« Reply #10853 on: October 16, 2015, 10:26:41 AM »
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Offline Hoppy

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Re: Kapanadze Cousin - DALLY FREE ENERGY
« Reply #10854 on: October 16, 2015, 10:51:36 AM »
Itsu,

find a old PC power supply in halfbridge configuration like in attached schematic, get it's transformer, use its 12V outputs legs
 and common as primaries for you and will work. Common you will connect to 24V, and 12V terminals to drains of mosfets.

Good luck !

Edit: As I sugested  above, you'll get about 300Vpp output which at 50% duty cycle means after rectification and filter 150Vdc.

P.S. Sorry for messing this page with large diagram.


I have attached the connections on my PC transformer for step-up working.

Regards
Hoppy

Offline Dog-One

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Re: Kapanadze Cousin - DALLY FREE ENERGY
« Reply #10855 on: October 16, 2015, 11:33:17 AM »
Thanks for the tips D1!

What capacity do you recommend in parallel with the power supply?

Surely not 3300uF like I initially used.  Take them way down.  For this, my rule of thumb is to keep the ripple Vpp down less than 10% of your intended rail voltage.  100uF seems to be gobs.  Run a lamp in series between the power supply and the inverter board as a pseudo fuse/resistor, then take a peek with the scope.  Using a current probe you should see the current ramp up when the MOSFET turns on, not a straight up square wave 40ns rise time.

You can also do similar tuning when the MOSFET turns off by finding a suitable capacitor that holds the output voltage for a short period, but when you do this you will end up needing a bit more sophisticated PWM where you can open up the dead time.  With the Mazilli circuit and your transistor bias limited, it's pretty easy to find a good combination.

HTH

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Re: Kapanadze Cousin - DALLY FREE ENERGY
« Reply #10855 on: October 16, 2015, 11:33:17 AM »
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Offline itsu

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Re: Kapanadze Cousin - DALLY FREE ENERGY
« Reply #10856 on: October 16, 2015, 11:33:57 AM »
Dog-one,

thanks for the info, i guess the core saturates like you said when using these coil, so i have to look for another set of coils.


Sky,

i see what you mean, so you  say that it is to be expected to see the double input voltage on the MOSFET's drains (25V -> 50V).
This however is not in agreement with when i change the both primaries of the transformer with  2 (middle fet) resistors, then it
just shows the single input voltage on the drains, see earlier screenshot.

Anyway, i did found another pair of coils i could use, they are connected to this common ground you mentioned.
I use this common ground now as the 24V input and with the both coil measuring 143uH it gives a clean (no ringing) square wave (60V) on the drains.
There is an output coil which gives me (after rectification) 135V dc out, so i will put that configuration on the PCB and take some pictures lateron.
I did add a 22K / 5W resistor across the 135V output
The diagram below shows where i have put the 24V now (common ground).


Jeg,

voltage rating of C24 is 250V, the R27 is a ½W resistor, it does not heat up, pictures and video later.


Regards Itsu

Offline skywalker66

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Re: Kapanadze Cousin - DALLY FREE ENERGY
« Reply #10857 on: October 16, 2015, 12:36:47 PM »
Sky,

i see what you mean, so you  say that it is to be expected to see the double input voltage on the MOSFET's drains (25V -> 50V).
This however is not in agreement with when i change the both primaries of the transformer with  2 (middle fet) resistors, then it
just shows the single input voltage on the drains, see earlier screenshot.

Anyway, i did found another pair of coils i could use, they are connected to this common ground you mentioned.
I use this common ground now as the 24V input and with the both coil measuring 143uH it gives a clean (no ringing) square wave (60V) on the drains.
There is an output coil which gives me (after rectification) 135V dc out, so i will put that configuration on the PCB and take some pictures lateron.
I did add a 22K / 5W resistor across the 135V output
The diagram below shows where i have put the 24V now (common ground).

Regards Itsu

Itsu,

it is correct what you say, but I'm also correct.
Your 2 resistors put in place of primaries for test purpose haven't mutual inductance.
Try to see that way: when one half primary is powered with 24V via mosfet, other half primary behave  as a secondary and receive 24V induced by first primary as the turn ratio between the two
primaries is 1:1, therefore, that 24V induced upon second half primary add up to 24V power supply
and from this your second mosfet drain voltage is rise up to 2 x Vps (24V) while first drain voltage is 0V (in conduction), and the same happens other half cycle.
Anyway, seems you managed to get the idea  and connect correctly and get desired 135Vdc at
output. I prefer to implement that kind of step up converter with tl494 or SG-whatever for output voltage control thru duty-cycle control or feedback control.

Offline itsu

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Re: Kapanadze Cousin - DALLY FREE ENERGY
« Reply #10858 on: October 16, 2015, 01:03:11 PM »

Skywalker,

ok, i got it, so it is expected behaviour, thanks for explaining.

After putting it all on a PCB, it again behaves differently  :o, so i have to troubleshoot again.......

Itsu

Offline itsu

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Re: Kapanadze Cousin - DALLY FREE ENERGY
« Reply #10859 on: October 16, 2015, 02:17:19 PM »

OK,  1 MOSFET source was not good connected to ground.

Below picture shows the PCB with the transformer in the lower left.
Input voltage is from 2x batteries in series, current for the whole PCB is about 90mA.
Output voltage across the (added) 22K resistor is 135V
Nothing is gotting hot.

The screenshot shows the drain signals.

The forum is very slow with me, so will upload a video later.

Thanks all,   regards Itsu

 

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