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Renewable Energy Discussion on various alternative energy, renewable energy, & free energy technologies. Also any discussion about the environment, global warming, and other related topics are welcome here.

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  #31  
Old 07-22-2016, 06:20 AM
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boguslaw boguslaw is offline
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If I were to check this OU device I would try first to make a concept device working at 50 or 60Hz. It looks very similiar to various patents.
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  #32  
Old 07-22-2016, 06:44 AM
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personal use of patent

Quote:
Originally Posted by Spokane1 View Post
Generally, people can build from any US patent any invention they want for their own use. It is when they sell those items that the patent protection kicks in.
Actually, it is technically illegal to do anything with a patent pending or patented invention even for personal use. I found this out when some crooks submitted a patent application for my plasma ignition circuit. This is what I discovered when researching it and also asking some IP attorneys. For years, I thought personal non-commercial use was exempt, but it is not. However, it is almost impossible to enforce without patent Nazi's knocking on everyone's door to see if anyone is infringing.

----------------------------------------------------------------------

35 U.S.C. 271 Infringement of patent.
35 U.S.C. 271 Infringement of patent. - Patent Laws

35 U.S.C. 271 Infringement of patent.

(a) Except as otherwise provided in this title, whoever without authority makes, uses, offers to sell, or sells any patented invention, within the United States, or imports into the United States any patented invention during the term of the patent therefor, infringes the patent.

(b) Whoever actively induces infringement of a patent shall be liable as an infringer.

--------------------------------------------------------

Nauseating but true. You must have permission from the assignee(s) of the patent who may not necessarily be the inventor.

But like I said, it is completely impractical for any individual or business to sue an individual for replicating their patent for personal use or for scientific inquiry, etc... and how would they know?

This sums it up nicely between the US and elsewhere:

Commercial and noncommercial use

In most European countries, the exclusive exploitation rights granted by a patent are restricted to commercial exploitation. A private person who builds the patented invention in his own home for his own personal goals cannot infringe on a patent. The reasoning behind this is that such a situation cannot harm the patent holder.

US law is more strict. It forbids anyone from making, using or selling the invention, even when the use is strictly personal. Of course, since patent infringement lawsuits are very expensive, a private person is rarely if ever prosecuted for using the invention in his own home. Such a situation could occur when a private person offers on his website a piece of software that uses someone else's patented technology. The patent holder may feel that the freely available software threatens his commercial product, and then decide to use the patent to prevent the distribution of the free product.
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  #33  
Old 07-22-2016, 10:58 PM
k4zep k4zep is offline
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Quote:
Originally Posted by RAMSET View Post
All comments welcome.

respectfully
Chet K
As soon as a DVD of Graham Gunderson's presentation is available
please notify me.

Respectfully
Ben K4ZEP
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  #34  
Old 07-22-2016, 11:19 PM
Spokane1 Spokane1 is offline
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Block Diagram

Fellow Builders,

Here is a Version 1 Block Diagram we can use for discussion and improvement.

Enjoy!
Attached Files
File Type: pdf Conceptual Gunderson Device 7-21-2016.pdf (71.0 KB, 95 views)
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  #35  
Old 07-24-2016, 08:46 PM
Spokane1 Spokane1 is offline
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Logic Board

Dear Builder,

Here is a first cut of dissecting the system's logic. I shall draft up an actual schematic at work. This may take a couple of weeks. Stay tuned.

Spokane1
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File Type: jpg Logic Layout.JPG (138.6 KB, 59 views)
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  #36  
Old 07-24-2016, 09:22 PM
Spokane1 Spokane1 is offline
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Let the Junk Box Replication Experiments Begin!
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  #37  
Old 07-28-2016, 02:55 PM
Spokane1 Spokane1 is offline
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Gunderson Logic Wiring Diagrams

Dear Builders and Measurement Specialists,

Here is my first pass at wiring diagrams for the Graham Gunderson Logic controller. There are two versions. One is the way things appeared to be wired during the presentation. The other is the way the system was connected a week after the convention in Graham's shop. In that version he has disabled some of the chips and appears to have attached one or two pulse generators to possibly sweep input signals.

There is a fair amount of detail in these drawings. I have included pdf versions so you can study the small text. The resistors came in pretty good, but I couldn't see what the values were for the capacitors or the trim pots.

The next step is to develop a logic diagram so that we can figure out what is happening.

Spokane1
Attached Images
File Type: jpg Experiments Logic Wiring 7-25-2016.JPG (114.9 KB, 44 views)
File Type: jpg Presentation Logic Wiring 7-28-2016.JPG (117.8 KB, 30 views)
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File Type: pdf Experimental Logic Wiring 7-25-2016.pdf (87.9 KB, 23 views)
File Type: pdf Presentation Logic Wiring 7-28-2016.pdf (86.7 KB, 18 views)
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  #38  
Old 07-29-2016, 03:30 PM
Spokane1 Spokane1 is offline
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Logic Diagram

Dear Builders,

This is the system logic controller diagram to date.

Enjoy!

Spokane1
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  #39  
Old 08-01-2016, 10:01 PM
Spokane1 Spokane1 is offline
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Logic Circuit

Dear All,

Here is another implementation (Bare Bones) of a Logic controller for the Gunderson Device. This one uses 100K trim pots and 1nF timing capacitors. It also gives a wide range of control over the timing parameters. I used 74LS123 and a 7414 (obsolete). The newer HC CMOS versions should give even better performance and can run at a higher voltage. This arrangement appears to have no starting problems.

What is missing are the trim pot saver resistors (typically 200 Ohm), more bypass capacitors, the push button switches that Graham used (for testing?) and the extra wiring shields around the ends of the IC's (see Graham's photo to see how this was done). I don't know if any of this extra stuff is needed since the fast transition times are controlled by the Power MOSFET drivers.

It appears to me that all of the timing parameters in this sub-circuit are manually controlled. I thought there would be some logic derived control signals, but apparently not.

Many thanks to TinselKoala and k4zep for the development of this circuit.

Up next. The development of an LTSpice VII simulation to see how those timing pulses control the H-Bridge to generate that discontinuous 2/3's sine wave excitation input.

Spokane1
Attached Images
File Type: jpg Bare Bones Controller.JPG (66.3 KB, 36 views)
File Type: jpg 800 0528.JPG (182.2 KB, 27 views)
File Type: jpg 800 0529.JPG (169.3 KB, 25 views)
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  #40  
Old 08-02-2016, 07:18 AM
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Did you found what is the purpose of all this electronics ? What it does to the signal going to H-Bridge and what is the final power signal results ?
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  #41  
Old 08-03-2016, 03:14 PM
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Simulation

Here is my perception of how the circuit is wired and one possible implementation of an attempted simulation. I've only been into this a few hours. Also attached are some response traces to single and double current pulses.

Spokane1
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File Type: jpg Gunderson 04 Circuit.JPG (55.7 KB, 40 views)
File Type: jpg Gunderson 03 7-8 13-53.JPG (36.0 KB, 22 views)
File Type: jpg Gunderson 03 9-0 18-2.JPG (27.6 KB, 20 views)
File Type: jpg Gunderson 04 A B.JPG (32.8 KB, 21 views)
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  #42  
Old 08-04-2016, 08:09 PM
RAMSET RAMSET is offline
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A comment from member Partzman at OU.com

here is a comment from member Partzman [reposted with permission]
from here
Graham Gunderson's Energy conference presentation Most impressive and mysterious

Partzman
Quote
""
I have finished watching Graham's MIT video and IMO, he really does give enough info to replicate.

Several points of note, when the input current as shown on CH2 (blue) reaches the negative peak, the primary core is saturated. At the flat top portion of the waveform, the primary core is at a higher permeability. The core bias is set of course by the PMs.

During the negative half cycle of the input voltage on CH1, the first pair of opposite H bridge switches are on and during the positive half cycle the second switch pair are used which is already known. However, during the remaining part of the input cycle when the core is in a high perm state, the second pair is left on and conduction is thru primarily the mosfet reverse conduction.

The synchronous mosfet switching uses both normal and reverse conduction and may have already been pointed out but not that I recall. While current is flowing thru the mosfet in the normal mode that is, when conventional current flow is from drain to source, the gate is switched off for a short period producing a large positive going voltage spike on the secondary. Also during this time, the secondary current and flux reverses
direction as is seen in the green channel and when the peak reverse is reached, gate voltage is again applied to the mosfet which now conducts in the reverse conduction mode that is, from source to drain with very low resistance. This action is what results in the output caps being charged negatively as shown. Graham also stated that the output current phasing is 180' from that shown.

Regarding the issue of the current connections on the input Clark/Hess power analyzer, he removed the original connections well after he had explained the operation of the device and all the input/output measurements. He made the change during a time he was explaining another aspect of the device.

The secondary core half is operated in a mostly linear mode while the primary core half is operating around the saturation knee. This seems to be a key prerequisite in the appropriate flux flows (or magnetic vector potential) along with the proper output synchronous timing.

I can now understand how a small capacitance added to the gates of the output synchronous mosfets could destroy the OU effect
---------------------------------------
End quote


respectfully
Chet K
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  #43  
Old 08-05-2016, 12:00 PM
David G Dawson David G Dawson is offline
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Implosion Transformer

Implosion Transformer - Graham Gunderson:
Hello Mark.
Thankyou all for your attempts to amplify what Graham presented at the Conference.
His talk was enlightening to say the least as I suspect that what he was doing is along a similar line to the 1966 RCA Colour TV transformer implosion that Steven Marks referred to.
The CTC-5 power supply using two 5UGs ('in case one failed') which I have also built and what I suspect as being the cause of the sustained Implosion due to the transformer being utilised with the two rectifiers with one side coming unbalanced with Gaham's system being controlled and the Implosion only of a brief but effective nature.
This is the simple reason that if you use two unmatched transformers, side by side with equal voltages that one will run amok with a possible explosion/implosion resulting from an unbalance situation.

This is where my 'Spherics Tetrahedral Device' (STD) is coming from along similar lines but with a rotating vortex magnetic field and also using time delays.
Think this is a much cleaner concept than Grahams and is more able to be replicated without the complex solid state controllers.
The 'Impulse Discharge' device also appears to be an easier candidate for others to build.
My opinion only which still requires a solid confirmation on two fronts.

I did not see anything about Edwin Sweet's Barium Magnet preparation as I also have his device here which is on the list for review as I see an error in my previous approach.
I did not see any hope of this being able to be connected to provide a useable power as the device is very much in its infancy.
Why is Graham using Mosfets when he can use Vacuum Tubes which have a much more positive switching capability than any solid state device?
Noticed his switching glitch in the yellow trace where he could be using dual direction thyratrons without any protection diodes that really kill any speed.
Error in his statement that square waves utilise even harmonics, should be the odd harmonics only as the second etc are not present because of the duty cycle.

4. Square Wave Harmonics

More information would be needed on the transformer used and its specific qualities.

I can see why Eric Dollard did not want to be present at the Final countdown.
I commend Eric for his TEM/LMD demonstration as it has helped me considerably with the STD organisation.

Smokey
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  #44  
Old 08-05-2016, 07:35 PM
Spokane1 Spokane1 is offline
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Gunderson System Schematic

Dear All,

Here is a system schematic to date.

Spokane1
Attached Images
File Type: jpg Over All Systen Schematic 8-4-2016.JPG (74.6 KB, 33 views)
Attached Files
File Type: pdf Gunderson Device-Schematic 8-4-2016.pdf (65.6 KB, 28 views)
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  #45  
Old 08-08-2016, 11:27 PM
Spokane1 Spokane1 is offline
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Synchronous Diode Component Layout

Spokane1
Dear All,
Here is a drawing of the Synchronous Diode Component Layout to help facilitate discussions about this sub assembly.
Enjoy!
Attached Images
File Type: jpg Synchronous Diod Layout.JPG (123.0 KB, 29 views)
Attached Files
File Type: pdf Synchronous Diode Layout.pdf (72.0 KB, 11 views)
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  #46  
Old 08-09-2016, 12:15 AM
David G Dawson David G Dawson is offline
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Coils & Transformers

Coils & Transformers:
Mark,
Thanks.
Are you intending a build as your excellent input here makes me feel you will be?
A Flyback 'C' or 'U' Core Ferrite would make a good option for the one displayed.
I heard Graham saying 'with a gap' and immediately saw a Flyback.
Looking at this with Vacuum Tubes in mind as I am distinctly not a fan of solid state.
A good description of why the paper thin gap here on Page 7:

Coils and transformers

Smokey
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  #47  
Old 08-09-2016, 12:29 AM
David G Dawson David G Dawson is offline
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Barium Magnets

Barium Magnets:
Mark, again you might be the person with an answer to what I seek in Barium/Ferrite Magnets.
I have made a stop production date of using Barium somewhere towards the end of the1960s.
Do you know of any method by which a Magnet containing Barium can be identified from a later production type?
Brian Prater designed a 'Magnet Tickler' which I built but saw that as a detector of Floyd Sweet's magnet 'conditioning' for his VTA but that is the only tool I might have to supply an answer but no idea of what to look for.
Both the VTA and MRA appear to have caused the cessation of Barium use to the general population - my observation.
Corporations appear to be able to order whatever they want but NOT you and I.
Thanks.

Smokey
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  #48  
Old 08-09-2016, 04:32 AM
Spokane1 Spokane1 is offline
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Availibility of Barium Ferrite Magnets

Quote:
Originally Posted by David G Dawson View Post
Barium Magnets:
Mark, again you might be the person with an answer to what I seek in Barium/Ferrite Magnets.
I have made a stop production date of using Barium somewhere towards the end of the1960s.
Do you know of any method by which a Magnet containing Barium can be identified from a later production type?
Brian Prater designed a 'Magnet Tickler' which I built but saw that as a detector of Floyd Sweet's magnet 'conditioning' for his VTA but that is the only tool I might have to supply an answer but no idea of what to look for.
Both the VTA and MRA appear to have caused the cessation of Barium use to the general population - my observation.
Corporations appear to be able to order whatever they want but NOT you and I.
Thanks.

Smokey
Dear Smokey,

Barium Magnets were banned by OSHA because they claimed that some workers were suffering ill health effects from the dust that is created during their manufacture. Was there another reason? Who knows but I give it a 50/50chance that they were withheld because of some other black box technology that we don't even know about and they wanted to insure that nobody could stumble across it. I really doubt that the cloistered inventions you mentioned would present enough of a threat in themselves to cause this to happen. I think that something much bigger was being protected.

Companies who want Barium Magnets can manufacture them in house with a variance permit from OSHA. It takes about $50K- 100K in equipment. The raw materials are available and the manufacture technology is not that difficult. It involves grinding, sifting, baking, and machining. Most companies wouldn't bother. There are custom fab plants in China that, for a fee, will make batches of these kinds of magnets. I hear that some of them are of very high quality, but again you are talking about a $50K up front order.

As far a most industrial applications go Neo's have supplanted ferrite magnets so there is really not much demand for them except in low cost markets.

There is a place in Seattle that is set up to do arc spectral analysis of ferrite powders. I believe it is about $250 and they will do 10 samples at a time. Other than that there is no way to tell a Barium Ferrite from a Strontium Ferrite.

Spokane1
Mark McKay
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  #49  
Old 08-09-2016, 04:51 AM
Spokane1 Spokane1 is offline
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Fly-Back Cores

Quote:
Originally Posted by David G Dawson View Post
Coils & Transformers:
Mark,
Thanks.
Are you intending a build as your excellent input here makes me feel you will be?
A Flyback 'C' or 'U' Core Ferrite would make a good option for the one displayed.
I heard Graham saying 'with a gap' and immediately saw a Flyback.
Looking at this with Vacuum Tubes in mind as I am distinctly not a fan of solid state.
A good description of why the paper thin gap here on Page 7:

Coils and transformers

Smokey
Dear Smokey,

Common CRT Fly-back transformers (which are no longer common) are to small for this apparatus for now. We need a core that is 4" wide and has 1" square arms. Until we are sure we can downsize the central core it is best to reproduce Grahams equipment as close as we can. Maybe we might be able to change the frequency in the future and use a smaller core. By then there will by no fly-back transformers available.

Dr. Tesla was able to advance this technology by using the properties of sparks as his switching system. It is only though the recent development of SiC Power MOSFETS that the switching speeds have come close to the operation of a spark switch at 10 ns rise times.

I'm sure that vacuum tubes can be used to do this kind of work as well, but you have to admit that one would have to have one heck of a COP to overcome the filament heat losses in the switching elements, not to mention the need for isolated filament transformers.

The 0.010" gap helps reduce the coupling k factor between the primary and secondary. Apparently each magnetic circuit need some degree of freedom for this process to work and a high coupling factor does not help. Apparently this optimum gap was determined experimentally.

Spokane1
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  #50  
Old 08-09-2016, 04:54 AM
aniccame aniccame is offline
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Diagram

Thanks for this circuit Mark. I do have a question.

It's my understanding that the SiC MOSFETs require a 20v/-5 volt gate drive. How is that accomplished in the schematic given?

Also, I may have missed it, but what function does the toroid located at the bottom serve?

Thanks,

Alan
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  #51  
Old 08-09-2016, 04:02 PM
Spokane1 Spokane1 is offline
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Synchroinous Diode Details

Quote:
Originally Posted by aniccame View Post
Thanks for this circuit Mark. I do have a question.

It's my understanding that the SiC MOSFETs require a 20v/-5 volt gate drive. How is that accomplished in the schematic given?

Also, I may have missed it, but what function does the toroid located at the bottom serve?

Thanks,

Alan
Dear Alan,

Graham actually has a dual channel isolated DC to DC switch mode power supply on the Synchronous diode circuit board, that is the purpose of the ferrite core in the center of the board. There are six windings on that ring. I believe that two of them are primaries and the rest are secondary's. Graham told me that the six photo isolators are Zener controlled and provide regulation feedback to gate the master oscillator. I believe that the TS556 timer, way back on the logic board, is the actual Power supply master clock. His circuit generates three voltages +12, +5, and -5 Volts.

Keep in mind that there are a lot of components on the back side of that board that are not shown in the photos we have.

My next drafting project is going to be a block diagram of what I think is on that board. That should help explain what is going on.

Really there are several ways to do this. As far as I understand it the control of the synchronous diode is simple. Both FETS are closed for 99% of the time. then they are opened between 5 and 1000 nS at a precise time in the systems timing, one pulse per cycle of operation.

While the FETS are closed there are two current loops feeding the big storage capacitor. the opposing currents cancel each other out so the net charge on the capacitor is whatever has been rectified into it in that brief moment.

Spokane1
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  #52  
Old 08-09-2016, 07:20 PM
aniccame aniccame is offline
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PC

Very interesting. I will wait to see what your block diagram looks like.

I am tempted to use my basic IRF mosfets to do a more simple replication just to play with it.

I also don't know what cores would be ideal but I have some smaller ones to play around with.

Your work is very important to making it viable though because SiC MOSFETs and Litz wire are going to be necessary.
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  #53  
Old 08-11-2016, 11:06 PM
Spokane1 Spokane1 is offline
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Quote:
Originally Posted by aniccame View Post
Very interesting. I will wait to see what your block diagram looks like.

I am tempted to use my basic IRF mosfets to do a more simple replication just to play with it.

I also don't know what cores would be ideal but I have some smaller ones to play around with.

Your work is very important to making it viable though because SiC MOSFETs and Litz wire are going to be necessary.

Dear Alan,

You are correct on the drive voltage for SiC devices. Graham specifically used +12 and +10 Volts probably for example rather than actual values. Everyone is going to have to adjust their power supplies to the devices they can afford.

Attached is my take of the Synchronous Diode Schematic. I'm sure improvements will be needed.

Spokane1
Attached Images
File Type: jpg Proposed Schematic 8-11-2016.JPG (89.2 KB, 27 views)
Attached Files
File Type: pdf Proposed Schematic 8-11-2016.pdf (83.0 KB, 16 views)
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  #54  
Old 08-13-2016, 12:32 AM
RAMSET RAMSET is offline
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A contribution for consideration

An old acquaintance of Grahams has offered a video to view

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...and please send Graham the link to this video:
https://www.youtube.com/watch?v=av53ZMeWQ-k
------------

respectfully
Chet K
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  #55  
Old 08-14-2016, 04:27 AM
Spokane1 Spokane1 is offline
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MOSFET Gate Leakage

Quote:
Originally Posted by RAMSET View Post
An old acquaintance of Grahams has offered a video to view

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...and please send Graham the link to this video:
https://www.youtube.com/watch?v=av53ZMeWQ-k
------------

respectfully
Chet K
This 8 minute video is well worth the time. It is done by Mr. "Itsu". You can tell by the quality of his equipment that he is well funded for this sort of work. He is demonstrating the magnitude of MOSFET gate leakage to the Drain and Source with a number of power MOSFET's at a number of frequencies.

I believe that the purpose of this demonstration is to show that there is energy leakage between a gate driver system and what ever load is connected to the drain/source. This has a noticeable impact to the proper measurement of low COP OU systems, in that these losses need to be accounted for or measured in order to get an accurate performance evaluation of the device under test.

What wasn't shown here, but maybe next time, is the magnitude of the losses involved. I believe that LED's operate at a forward voltage of around 3.3 volts while they can consume anywhere between 10 and 100 mA. That could be a power loss between 33 and 330 milliwatts per switching element.

This is good technical information that researchers in this field should be aware of.

Spokane1
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Old 08-14-2016, 03:40 PM
RAMSET RAMSET is offline
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A leaky observation ? ....perhaps not !!

Forward from Smudge [Cyril Smith]
Quote
From GG's demonstration of a sawtooth flux waveform I have taken the primary current waveform then deduced the secondary current needed to create that sawtooth, assuming normal transformer action where the flux comes from the difference between pri and sec ampere turns. Done crudely from my sketched waveforms. And I get a secondary current very much like that shown by GG. So I deduce that there is no significant flux leakage and my original estimate of the primary flux waveshape is wrong.

Smudge
----------------------------------------------

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Chet K
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  #57  
Old 08-18-2016, 05:26 PM
Spokane1 Spokane1 is offline
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Gentlemen,

Folks disregard this drawing - it is missing some components - I shall repost an updated version below.

In my simulations of the H-Bridge circuit I have found that two of the MOSFETS are not active therefore making them unneeded. Upon further examination I have found that the entire H-Bridge can be replaced with one switch and a diode. The input to the primary of the Gunderson Transformer is the same in that it produces the same voltage and current wave forms with far fewer components.

k4zep made additional simplifications by proposing that the switching elements be placed on the low side of the circuit to better reference driver connections. This circuit variation also simulates the same as a full four element H-Bridge.

Graham said 7/18/2016 that he was planning to redo his H-Bridge with a two switch design. He also said that providing schematics to his demonstration device would be pointless since he was planning to re-do all the circuits. Both statements seem to be correct.

Anyway, here is the proposed simplified circuit. The elimination of three switching elements should reduce the gate leakage issue by 50%.

Does anyone see any issues with this design and why it might not work as good as a full H-Bridge in this application?

Oops the polarity on the 220 VDC power supply is backwards.

Spokane1
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File Type: jpg Simplified Gunderson Schematic 02.JPG (96.0 KB, 18 views)
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File Type: pdf Simplified Gunderson Schematic 02.pdf (65.3 KB, 11 views)
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Last edited by Spokane1; 08-19-2016 at 03:11 PM. Reason: Error on drawing
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  #58  
Old 08-18-2016, 06:27 PM
Spokane1 Spokane1 is offline
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Gentlemen,

Here is my take on the operation of the Synchronous Diode.

Comments Welcomed!

Spokane1
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File Type: jpg Theory Synchronous Diode 01.JPG (99.3 KB, 22 views)
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  #59  
Old 08-19-2016, 03:15 PM
Spokane1 Spokane1 is offline
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Posts: 356
Dear All,

Here is the updated schematic, Lt Spice schematic and a timing chart for the primary circuit for your use and pleasure.

Spokane1
Attached Images
File Type: jpg Simplified Gunderson Schematic 03 - Copy.JPG (99.2 KB, 28 views)
File Type: jpg Ben's Variation 01 Schematic.JPG (148.5 KB, 25 views)
File Type: jpg Rimary Timing 01 - 800.JPG (62.1 KB, 22 views)
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  #60  
Old 08-22-2016, 04:28 PM
Spokane1 Spokane1 is offline
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Join Date: Aug 2008
Posts: 356
12 Volt Operation

Dear All,

This weekends work showed a little promise. I was able to get the junk box mockup circuit to lock into the proper timing sequence to display the discontinuous sine wave. I just have the primary circuit operational. This evening I shall add the synchronous diode circuit and start to get a look at the backend operation. For what its worth this circuit shows:

1. This circuit will function at 12 VDC (using the single switch approach)

2. Operation can take place as low as 3.2 kHz

3. A classical laminated iron core will support the novel oscillation pattern.

None of this means that we are in the OU window of operation, but it is nice to see some hardware implementation of the circuit under discussion. Using the component parameters I have in the actual circuit the simulation shows that I might be able to harvest up 6.5 Watts at a COP of .863. I'm sure the real world performance will be far less than this.

The advantage of the 12 V approach is that all the excitation energy comes from one source. All the gate losses, skew losses, and magnetic probe interference issues can be evaluated. If this circuit can perform as a self runner then this is the direction to go.

The simulation also shows that the circuit performance improves if I were to use a smaller charging inductance choke. The junk box device (from a salvaged X-Ray transformer) has a 1 KHz inductance of 11.5 mH. The simulation shows that I need a 2 mH unit there. Grahams circuit apparently used a .0324 mH custom device.

If any one is interested in a schematic for this temporary evaluation circuit let me know. I'm sure there will be several variations employed as the circuit technique improves.

Spokane1
Attached Images
File Type: jpg IMG_0545.JPG (88.6 KB, 15 views)
File Type: jpg IMG_0548.JPG (124.2 KB, 21 views)
File Type: jpg IMG_0551-800.JPG (143.4 KB, 17 views)
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