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  #61  
Old 08-25-2016, 11:10 PM
Spokane1 Spokane1 is offline
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Junk Box Mockup Circuit

Dear All,

Here is the schematic for the circuit under consideration. Note this is a simplified approach and is not as advanced as the original Gunderson circuit, but it is a lot cheaper.

Spokane1
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File Type: jpg IMG_0222 - 800.JPG (198.4 KB, 34 views)
File Type: jpg IMG_0227 - 800.JPG (149.3 KB, 29 views)
File Type: jpg IMG_0223 - 800.JPG (115.8 KB, 26 views)
File Type: jpg Junk Box Mockup 8-23-2016 Capture.JPG (78.7 KB, 55 views)
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  #62  
Old 08-31-2016, 09:00 AM
3758 3758 is offline
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H-Bridge

Just found out about this project today... and read all I could... very interesting.

I've been wondering why nobody has suggested using IGBT's, instead of "extreme" SiC MOSFET's. IGBT's are far more "at home" with high voltages, and much cheaper.

The switching "ON" state loss isn't measured in milliOhms as in MOSFETs, but rather in Volts like bipolar transistors (which it is)... but when you consider the SiC MOSFET has 25mOhms RDS(on), if you had 90A pulses going through it, you have 2.25V VDS(on). That's a typical VCE(on) range for high power IGBT's... regardless of the current.

If the H-bridge switching pulses are low current, then the MOSFET can have less power loss... but IGBT's can still handle peak Voltages much easier... and at FAR lower prices, and still have extremely good (fast) switching speeds.

Their Gate drive requirements are very similar to normal MOSFETs... +5 ~ +15V range (nominal).

The NGTB25N120FL3WG (US$4.66 ea.) is 1200V, 100A (@25C), 1.70V VCEsat at 25A @ 25C, rise time 21nsec, turn-on delay 15nsec

I know the first working unit was just that... throw sturdy parts it for safety's sake... but for full-scale replications... it may be a good alternative.

(just sharing some thoughts...)
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  #63  
Old 09-09-2016, 08:56 PM
Spokane1 Spokane1 is offline
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Switching Components

Dear 3758,

I'm sure that whoever replicates this device will use the solid state switches they have faith in and those that they can afford. I'm sure the fundamental physics of this process doesn't care how the fast switching speeds are acheived. Dr. Tesla and E.V. Gray employed quenched spark gaps. Paul Babbcock uses a series combination of SCR's, IGBJT's, and a sterring diode.

Until we understand what is going on we just don't know the required rise and fall times of the switching elements or the magnitude of the Vdds ratings that are needed.

Go ahead and use what you have on hand. I'm sure that for every replication built a differet type of switch will be used.

Spokane1
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  #64  
Old 09-09-2016, 09:02 PM
Spokane1 Spokane1 is offline
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Results of a single Switch system

Dear All,

I have been exploring the performance of the simplified single switch approach in building a Graham Gunderson system.

I have found that even though the primary voltage looks the same under unloaded conditions it becomes distorted when load is applied to the secondary. At maximum loading the second positive swing of the input voltage dissapears. That can't be good for the non-clasical process we are hoping to duplicate.

I am now building a full H-Bridge and am adding the logic necessary to time the second phase.

Spokane1
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  #65  
Old 09-11-2016, 02:38 PM
verpies verpies is offline
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Quote:
Originally Posted by 3758 View Post
I've been wondering why nobody has suggested using IGBT's, instead of "extreme" SiC MOSFET's. IGBT's are far more "at home" with high voltages, and much cheaper.
...and much slower.
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  #66  
Old 09-12-2016, 12:48 AM
RAMSET RAMSET is offline
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also being discussed here

Graham Gunderson Energy conference High COP demonstration

and here

Graham Gunderson's Energy conference presentation Most impressive and mysterious

respectfully

Chet K
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  #67  
Old 09-19-2016, 04:12 PM
Spokane1 Spokane1 is offline
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H-Bridge Logic Variation

Dear All:


Here is a simple variation to the logic circuit to generate the Phase B signal for the H-Bridge.

Spokane1
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File Type: jpg IMG_0632-800.jpg (144.3 KB, 12 views)
File Type: jpg H-Bridge Logic Variation 9-18-2016.JPG (61.2 KB, 21 views)
File Type: jpg IMG_0633-800.jpg (223.6 KB, 12 views)
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  #68  
Old 10-01-2016, 10:07 AM
RAMSET RAMSET is offline
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some Musings on the energy source By Cyril [member Smudge

also being discussed here

Graham Gunderson's Energy conference presentation Most impressive and mysterious

Magnetic Compression Study" by Cyril Smith

respectfully

Chet K
Attached Files
File Type: pdf The Gunderson Smith Effect.pdf (120.5 KB, 25 views)
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