My Motors got me to Tap into Radiant Energy

[larryross]

What is the device number of your ultra fast 1200V IGBT?

[kEhYo77]

@ Larry, yep I'm in my 30ies if You can call it young
Maybe there is something I said? Don't know, English is my secondary language so there might be some funny errors.

For the 2SK2837 fet specified 8V for gate drive is enough looking at the chart from the datasheet.

[larryross]

@ Larry, yep I'm in my 30ies if You can call it young
Maybe there is something I said? Don't know, English is my secondary language so there might be some funny errors.

For the 2SK2837 fet specified 8V for gate drive is enough looking at the chart from the datasheet.

kEhYo77
Ya... when you are in your late 60's, 30ish is very young... I was your age or older when you were borne. I used to think 70 was old, but it doesn't seem so old any more.
Yes it was something you said, this was the hint "For most of mosfets the gate drive is 10V it even goes down to 5V for logic level fets". Though there are many newer devices that show +- 30 VGS, one that isn't close to the trade wouldn't know it.
About my FET, I wasn't to careful about reading the charts, guess I will have to go and recheck it. You are saying that 8 volts will saturate the FET so I can get full on for nice 36V square pulse out? Good hope you are right.

Larry

[codeboundfuture]

Re-reading the thread, lots of good information from everyone.

best wishes,
matt

[JohnStone]

...Though there are many newer devices that show +- 30 VGS, one that isn't close to the trade wouldn't know it....

If we drive a gate (voltage) or base (current) more than necessary they perform with slower switching. Transistors suffer of this effect more than FETs.
It is no necessity to drive FETs higher than their optimum voltage vs. current. There are some tricks out there in order kick the gate with a short higher voltge pulse in order to get the required charge faster into the gate. But that is another story.
The maximum voltage at gate shall not be confused with the necessary gate voltage for minimum RDS ON
For 2SK2837 the satisfied test condition is 10V / 10A but typically it will be fully switched on at 6V.
Below 4V it is securely switched off.

I prepared my driver circuit to perform up to 15V.

[torpex]

Hi all

I played with the new LM339 circuit in battery charger mode:



Charge time: 4 hours
Disconnect when it reached 15.22v
Seems fully charged, disconnected after 2 hours: 12.85v
Curiosity in ammeters: 0.9A Input and 1.10A charger

[larryross]

If we drive a gate (voltage) or base (current) more than necessary they perform with slower switching. Transistors suffer of this effect more than FETs.
It is no necessity to drive FETs higher than their optimum voltage vs. current. There are some tricks out there in order kick the gate with a short higher voltge pulse in order to get the required charge faster into the gate. But that is another story.
The maximum voltage at gate shall not be confused with the necessary gate voltage for minimum RDS ON
For 2SK2837 the satisfied test condition is 10V / 10A but typically it will be fully switched on at 6V.
Below 4V it is securely switched off.

I prepared my driver circuit to perform up to 15V.

Thanks John and kEhYo77
I will certainly give this a try before I go and rebuild. It seems that turning on a FET was more complex than that. It seems like I remember there was a linear correlation between the % of +- Vgate spec and the % turned on. Another problem of being old and not keeping in the game.

Regards
Larry

[iankoglin]

Winding Direction

Hello Kogs,

The one with 1.5 Ohms should work great as a primary.
Now you've said they are connected in series, but, I hope you are following same winding direction in all strands.
The 0.5 Ohms should work as secondary, not as primary!...However, it will not give you higher outputs than primary.
Glad you got an IR Thermometer!

Good testing


Regards

Ufopolitics

G'Day UFO
I have been seriously thinking when you said I hope you are following same winding direction in all strands.

When I wound my coil looking from the top I wound all the strands in a clockwise direction, each strand was a separate strand with a pigtail each end as shown here
http://i1193.photobucket.com/albums/...ingthecoil.jpg

and here is the finished 8 layered coil
http://i1193.photobucket.com/albums/...trands15mm.jpg


The question NOW Which way to connect the strands?
Option 1 Series wound current in each strand runs in same direction I think
[IMG][/IMG]

Option 2 Wound in series current in each strand runs in opposite direction I think
[IMG][/IMG]

I had and still have wound connections as per Option 2

Please advise which is CORRECT It is easy for me to adjust

Kindest Regards

[prochiro]

Coil

Kogs
In option 2, when you double back the second wire with current going the opposite way as wire 1, you are killing with the second wire what you created in the first. Option one is the correct method for series winding. Wires are connected like ----- start-end-start-end-start-end so current always goes in the same direction.
Dana

[Ufopolitics]

Hello Iankoglin

G'Day UFO
I have been seriously thinking when you said I hope you are following same winding direction in all strands.

When I wound my coil looking from the top I wound all the strands in a clockwise direction, each strand was a separate strand with a pigtail each end as shown here
http://i1193.photobucket.com/albums/...ingthecoil.jpg

and here is the finished 8 layered coil
http://i1193.photobucket.com/albums/...trands15mm.jpg


The question NOW Which way to connect the strands?
Option 1 Series wound current in each strand runs in same direction I think
[IMG][/IMG]

Option 2 Wound in series current in each strand runs in opposite direction I think
[IMG][/IMG]

I had and still have wound connections as per Option 2

Please advise which is CORRECT It is easy for me to adjust

Kindest Regards

Hello Ian Koglin,

I am glad you asked me before going on...
Definitively would be Option 1


In Option 2 You are right, you are going against direction in each one...therefore, they will cancel magnetic fields to a big zero...no cigar, no joy.

You have to think as if you were winding continuously as if all strands were just one wire, and without stopping...then you will choose number one option.

But now that you have shown this graphics...I am wondering how did you measured the resistance in the whole Primary Strands originally?...

On the other hand, you have said you wanted really a great result, great output...and honestly, when you said all this strands measured 1.5 Ohms, I thought they were all in parallel connection at the time you measure them...

Now, If you really want a great output...They all -IN PRIMARY- should be connected in parallel, meaning all starting terminals together as one ...and all ends together...making it a "Three Filar Coil"...BUT!!...THEY MUST BE ABOVE ONE (1) OHM!!!

Now I need to know what your resistance would be once connected as option one or two...or maybe that is the way you have measured them before...You tell me.

Both options, one (1) and two (2) should read same resistance...but not if connected in parallel.

The fact of using Option One and not in parallel is NOT going to blow anything in your circuit...it is just not going to be such an outstanding output, that's all.

Let me know


Regards


Ufopolitics

[iankoglin]

Hello Ian Koglin,

I am glad you asked me before going on...
Definitively would be Option 1


In Option 2 You are right, you are going against direction in each one...therefore, they will cancel magnetic fields to a big zero...no cigar, no joy.

You have to think as if you were winding continuously as if all strands were just one wire, and without stopping...then you will choose number one option.

But now that you have shown this graphics...I am wondering how did you measured the resistance in the whole Primary Strands originally?...

On the other hand, you have said you wanted really a great result, great output...and honestly, when you said all this strands measured 1.5 Ohms, I thought they were all in parallel connection at the time you measure them...

Now, If you really want a great output...They all -IN PRIMARY- should be connected in parallel, meaning all starting terminals together as one ...and all ends together...making it a "Three Filar Coil"...BUT!!...THEY MUST BE ABOVE ONE (1) OHM!!!

Now I need to know what your resistance would be once connected as option one or two...or maybe that is the way you have measured them before...You tell me.

Both options, one (1) and two (2) should read same resistance...but not if connected in parallel.

The fact of using Option One and not in parallel is NOT going to blow anything in your circuit...it is just not going to be such an outstanding output, that's all.

Let me know


Regards


Ufopolitics

G'Day UFO,Dana
thanks for your input
@ UFO
When I wire each strand should I wire them as a bifilar that is each series of layers making up the primary coil and the Secondary coil be made of wired mixed every second layer or contiguous layers so that the primary is first coil only, then the secondary in series laying all by itself on top of the primary?

[IMG][/IMG]
Regards Kogs

[larryross]

Kogs
If you really wired it as pictured where with every layer you started at the top with each layer and wound the same direction then you would wire as option 1, but if you wound a normal wind that goes from top to bottom then from bottom to top as in the attached picture then you would need to wire as option 2.
When I did my coils for my reciprocating electric motor I did quadfilar by winding 4 wires simultaneously from top to bottom then from bottom to top (believe me it isn't easy to do) always winding the same direction. When finished I had 4 wires side by side at the beginning of the wind and 4 at the end and it was easy to figure out how to connect them for series or parallel.

Hope this helps
Larry

[Ufopolitics]

Primary-secondary

G'Day UFO,Dana
thanks for your input
@ UFO
When I wire each strand should I wire them as a bifilar that is each series of layers making up the primary coil and the Secondary coil be made of wired mixed every second layer or contiguous layers so that the primary is first coil only, then the secondary in series laying all by itself on top of the primary?

[IMG][/IMG]
Regards Kogs

Hello Ian,

The Primary should be wired as a Multifilar , meaning all strands together, do not need to twist them, just straight but keeping them together as you wire, since they tend to spread apart (not good).

Now Radiant transfers from OUTSIDE-IN, and NOT good, very weak when secondary is located in the outer embodiment of Coil, or on top of Primary. So, my best recommend is to wire first your secondary right next to coil core, then the Primary above it.

...the Secondary coil be made of wired mixed every second layer or contiguous layers so that the primary is first coil only, then the secondary in series laying all by itself on top of the primary?

So, No Ian...it is the "other way around"...Secondary FIRST, then Primary to be at the Outer Coil Embodiment.

And just forget about Option Two (2)...like Dana said...it kills, cancel EM Field between them, big ZERO, no matter how you've wound the coil...And the Magnetic Field is what We should care the most here!!




Regards


Ufopolitics

[Ufopolitics]

Option 1 Versus Option 2 Fields

Hello all

I consider this explanation as very important, not only for this coil app, but also for winding Motors Generators in my future Thread.

Below I uploaded same pics as Ian Koglin, both options, reflecting the way magnetic fields will project in each coil...


Option Two: Total Electro Magnetic Field strength=N1+N3-N2,

meaning N1-N2=0

Therefore Total EMF=Just N3 Coil

Or 1N

Option One:Total EM Field strength= N1+N2+N3

Or 3N



Regards

Ufopolitics

[iankoglin]

Kogs Coil

Hello Ian,

The Primary should be wired as a Multifilar , meaning all strands together, do not need to twist them, just straight but keeping them together as you wire, since they tend to spread apart (not good).

Now Radiant transfers from OUTSIDE-IN, and NOT good, very weak when secondary is located in the outer embodiment of Coil, or on top of Primary. So, my best recommend is to wire first your secondary right next to coil core, then the Primary above it.



So, No Ian...it is the "other way around"...Secondary FIRST, then Primary to be at the Outer Coil Embodiment.

And just forget about Option Two (2)...like Dana said...it kills, cancel EM Field between them, big ZERO, no matter how you've wound the coil...And the Magnetic Field is what We should care the most here!!


Regards


Ufopolitics

G'Day UFO

I have only 12 strands
I have configured my coil as from outside strands inward Option 1
The resistances are inseries
1 to 5 = 1.08 Ohms
1 to 6 = 1.26 Ohms
1 to 7 = 1.42 Ohms

I can have probably outer coil =1.42 Ohms and secondary probably 1.08 Ohms( I didnot connect secondary yet)
Or
2 Primary coils only as 1 to 6 above in parallel probably1.6 Ohms in total
Please what do you advise
[IMG][/IMG]
Regards Kogs