Use for the Tesla Switch

[hherby]

Soa

Thanks Mike,

That was a great article. I have a much better understanding of transistor selection now.

Alex

[Plazma]

Learning the Hard Way . . .

Hi Gang,

Since I was in the middle of a 4bat TSw build when I was rudely interrupted by a trip to the local ICU, now that I'm back and able to quasi-function I finished the build and started testing. Bad decision - should have re-read the thread and started over - the glorious, 'beefy', hi-switch-speed diodes I so carefully culled out of my haversack of 'spare parts' reared up and bit me big-time. I should have looked more carefully at the forward voltage drops on the diodes as those incremental drops, properly summed up, killed all potential that should have been available for my TSw. - ergo, no charging - nada - zip. Better parts now on order - rebuild in work -

The definition of a Sadist is someone who is kind to a Masochist - if I was doing any better I couldn't stand it.

Cheers,

Plazma

[Inquorate]

Icu

Hi Gang,

Since I was in the middle of a 4bat TSw build when I was rudely interrupted by a trip to the local ICU, now that I'm back and able to quasi-function I finished the build and started testing. Bad decision - should have re-read the thread and started over - the glorious, 'beefy', hi-switch-speed diodes I so carefully culled out of my haversack of 'spare parts' reared up and bit me big-time. I should have looked more carefully at the forward voltage drops on the diodes as those incremental drops, properly summed up, killed all potential that should have been available for my TSw. - ergo, no charging - nada - zip. Better parts now on order - rebuild in work -

The definition of a Sadist is someone who is kind to a Masochist - if I was doing any better I couldn't stand it.

Cheers,

Plazma

@ plazma - Injuries suck. Welcome back

@ all; y'know what'd be nice? A semiconductor switch that opens in both directions when the base is triggered.

[Murlin]

If it is commutation, then you probably know that you don't need any of those devices, except the rectifiers for the bridge if you want DC instead of AC

Yes, I am using commutation to produce DC.

The original schematic I started with had a commutator used for switching. 2 pairs of diodes to split the charge potential evenly as the switch changed from the series state to the parallel state.

It was my understanding that without these diodes, one of the batteries would run down. Therefore commutation alone would be extremely efficient, but not keep the batteries charged when a load was applied.

And after all, the goal is to run a load while keeping the batteries fully charged.

So, I was the on that was confused by the other thematic draw by Ron.
Thanks for clearing thats up.

The reason I am studying this thread in the first place is because this is the best Forum I have found on the INTERNET where there are so many skilled individuals were working on the TS. I am here to pick the brain of those willing.
Thank you for your input. I need all the help I can get.

Regards,

Murlin

[Plazma]

@ plazma - Injuries suck. Welcome back

Thanks @Inq - I'm lucky (and very grateful) to be back - I would be sick indeed to miss what's going on in this group - just terrific!
Best,

Plazma

[Plazma]

TSw Load Concept - TriFilar SSC Coil

Hi All,

Since I'm into a complete rebuild of my TSw, I've been reading about various loads on this thread trying to get more insights into the impedance matching issue. Having recently run experiments on a trifilar wound coil in a solid-state charger, which goes into 'self-resonance' at a particular frequency based on coil, battery, and other circuit parameters, I've wondered if such a trifilar wound coil might prove useful as a load/impedance balance/1:1 isolation device for the TSw. If we designate the trifilar wound coil windings as A,B, and C such that the "A" coil is part of the A-load-leg when side "A" of the switch is active, and the "B" coil is part of the B-load-leg when side "B" of the TSw is active, then one could put a bridge rectifier (and other load elements) across the "C" coil and have those elements both isolated and, hopefully, impedance matched when one finds the switching frequency(s) that the batteries "like". Also, the coils might amplify the switching "spikes to enhance "charging". In addition, one could put an LED of the correct polarity/orientation (with ballast resistor) across each of the A&B coils, above to try and get the impedances into what the switch and batteries dictate. One of the reasons for my speculation in this direction is that I bought the coil in question from JB's website, trifilar wound of 3 strands #23 AWG, Litz twisted, 400 turns - and the implication was/is that this size coil complete with welding rod core was/is a reasonable "impedance match" for a 12 volt battery - so, maybe that coil might give up some clues as to where to start. Anyway - I'm going to build and test this concept and I will report back the results, good - bad - or whatever. Now if someone has some insights or "gotchas", please chime in. This is just an off-the-wall idea that has been bugging me, and it might be a really lousy idea because of my ignorance and lack of experience.

Thanks for Your Inputs,

Plazma

[Matthew Jones]

This is just an off-the-wall idea that has been bugging me, and it might be a really lousy idea because of my ignorance and lack of experience

Someone please stop me if I am wrong... Otherwise if it goes boom I guess I will know soon enough...

If your unsure as to whether or not the switching will work as wired use longer wires and bundle them, the first time.
If the wire (Except around the load) are jumping around you have a problem. This is a precursor to a fire. LOL

I won't tell ya how I figured that one out.

Matt

[Matthew Jones]

double posts are killing me lately

[Bit's-n-Bytes]

Initial Digital TS Test Results

Hi team, here is some intial test results with the D-TS. After troubleshooting the board for a 10 Min. to determine why the computer was not able to see the chip, one has to realize to connect the battery first . Moving along---

John, hope you don't mind me using your wave form drawing but here goes. The wave form we seek is the first drawing, the second drawing illustrates (somewhat) of the wave form that I am getting. I know that I am close as this is a timing issue with Q1 and Q2 firing almost at the same time and I need to put a delay in between Q1 and Q2. I simply ran out of time but will be hard at it again tonight. I do have a problem with the way I have the LED's configured and will attach the fixed schematic when I redesign the solution.
Is the desired results for the "Charge light" to be just dimly glowing?

Thanks

Bit's

[ldissing]

Yes, I am using commutation to produce DC.

The original schematic I started with had a commutator used for switching. 2 pairs of diodes to split the charge potential evenly as the switch changed from the series state to the parallel state.

It was my understanding that without these diodes, one of the batteries would run down. Therefore commutation alone would be extremely efficient, but not keep the batteries charged when a load was applied.

And after all, the goal is to run a load while keeping the batteries fully charged.

So, I was the on that was confused by the other thematic draw by Ron.
Thanks for clearing thats up.

The reason I am studying this thread in the first place is because this is the best Forum I have found on the INTERNET where there are so many skilled individuals were working on the TS. I am here to pick the brain of those willing.
Thank you for your input. I need all the help I can get.

Regards,

Murlin

If the commutator was built with thought (I don't mean that in a bad way), one would not need the diodes to split the high side positive to both positives on the low side. It would have to be something like Matt showed in some of his early posts, and I don't know anything much about it, but it can be done without semiconductors I believe.

Leroy

[ldissing]

Hi All,

Since I'm into a complete rebuild of my TSw, I've been reading about various loads on this thread trying to get more insights into the impedance matching issue. Having recently run experiments on a trifilar wound coil in a solid-state charger, which goes into 'self-resonance' at a particular frequency based on coil, battery, and other circuit parameters, I've wondered if such a trifilar wound coil might prove useful as a load/impedance balance/1:1 isolation device for the TSw. If we designate the trifilar wound coil windings as A,B, and C such that the "A" coil is part of the A-load-leg when side "A" of the switch is active, and the "B" coil is part of the B-load-leg when side "B" of the TSw is active, then one could put a bridge rectifier (and other load elements) across the "C" coil and have those elements both isolated and, hopefully, impedance matched when one finds the switching frequency(s) that the batteries "like". Also, the coils might amplify the switching "spikes to enhance "charging". In addition, one could put an LED of the correct polarity/orientation (with ballast resistor) across each of the A&B coils, above to try and get the impedances into what the switch and batteries dictate. One of the reasons for my speculation in this direction is that I bought the coil in question from JB's website, trifilar wound of 3 strands #23 AWG, Litz twisted, 400 turns - and the implication was/is that this size coil complete with welding rod core was/is a reasonable "impedance match" for a 12 volt battery - so, maybe that coil might give up some clues as to where to start. Anyway - I'm going to build and test this concept and I will report back the results, good - bad - or whatever. Now if someone has some insights or "gotchas", please chime in. This is just an off-the-wall idea that has been bugging me, and it might be a really lousy idea because of my ignorance and lack of experience.

Thanks for Your Inputs,

Plazma

JB said the "impedance" for a battery was .023 ohms, or 23 milli ohms. The "resistance" on that coil is way bigger than 23 milli ohms. It will do something, and it is a good thought, but an "impedance match" for a 12V battery...I do not think so, at least not a "great" one. That is my opinion only, don't take it as gospel.
***EDIT I would still give it a go though, if I could do some testing. You will get some output off the third coil while the current goes through...both ways...on the other two. It will be an interesting exercise!" ***EDIT

Leroy

[RS_]

Hello John B.

It's very good to see you posting about the TS and these switching topics....

I found your statement below very interesting, in that you have tryed so many wiring configerations.

Have you considered the Mass/weight of the copper wiring, as compared to a load coil's Mass/weight, or the batterys Mass/weight in what you are researching...?

The Mass/weight matching of a SSG output cable to the SSG's coils has been discussed some in the past

Leroy,

I have come to a strange conclusion that switching is everything.

I have built now in the past weeks 50 different units every which way just to see what each layout does different. I made some with clip leads, some with extra long traces, some with skinny traces going different ways and so on.
I think what the group will find out about me is that I look at everything, including ways to use lower voltage transistors and speed up opto couplers. I put my Ideas up on this group, hold nothing back here. I can't give away company stuff, but I can do this type of research with the group.

JB

Thanks for Sharing your vast Knowledge with us all....

RS

[citfta]

Mechanical Tesla Switch

Plazma,

Here is a drawing I did of one way to make a Tesla Switch without any solid state parts. I tried this using relays and it did not charge although the batteries lasted a long time with a small load. I think it did not charge because I was switching way too fast according to John B. If you look at it you will see I have shown the left side switches in the parallel position and the right side switches in the series position. Maybe this will give you an idea how you can do this with your commutator. Good luck and be sure and let us know how it turns out. citfta





P.S. Sorry for the small size of the drawing I am still learning how to make drawings and attach them to my posts. LOL

[John_Bedini]

Tesla Switch

bit's,
Little more dead time.
Jb

Hi team, here is some intial test results with the D-TS. After troubleshooting the board for a 10 Min. to determine why the computer was not able to see the chip, one has to realize to connect the battery first . Moving along---

John, hope you don't mind me using your wave form drawing but here goes. The wave form we seek is the first drawing, the second drawing illustrates (somewhat) of the wave form that I am getting. I know that I am close as this is a timing issue with Q1 and Q2 firing almost at the same time and I need to put a delay in between Q1 and Q2. I simply ran out of time but will be hard at it again tonight. I do have a problem with the way I have the LED's configured and will attach the fixed schematic when I redesign the solution.
Is the desired results for the "Charge light" to be just dimly glowing?

Thanks

Bit's

[Bit's-n-Bytes]

bit's,
Little more dead time.
Jb

Thank you Sir.