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Chris Cristini

Sun Oct 05 2014, 05:56PM

Registered Member #1749 Joined: Fri Oct 10 2008, 02:04AM
Location: Claremont New Hampshire
Posts: 497

I am working on a small 48V sstc I was just wondering does anyone think a lithium type battery would handle the current draw?

TwirlyWhirly555

Sun Oct 05 2014, 07:15PM

Registered Member #4104 Joined: Fri Sept 23 2011, 06:54PM
Location: Uk .
Posts: 122

If its a high rated C lithium ion polymer , then It should be fine .

What is the current draw ? are you running CW or interrupted ?

Chris Cristini

Sun Oct 05 2014, 07:25PM

Registered Member #1749 Joined: Fri Oct 10 2008, 02:04AM
Location: Claremont New Hampshire
Posts: 497

I want to make an interupter for this project and try to put all electronics in its case with batteries and all it is a project I just started after my first post other coils I have started I was never able to finish this one will be the first I am even going to try to put the charger in the case so I can use a normal PSU cord to charge the unit but starting to realize 48 volts worth of batteries will not fit.
]img_20141005_151233.jpg[/file]
]img_20141005_151223.jpg[/file]

Jazzman56

Mon Oct 06 2014, 09:37AM

Registered Member #7222 Joined: Sat Oct 13 2012, 06:04AM
Location:
Posts: 18

Hi Chris,

48 volts worth of Li-Po cells is achievable (although cell balancing may be an issue), inherently you will have a very small capacity to fit within the constraints of your case. Why not try for a 4 cell pack/brick

and build an inverter ?

Then again an inverter will take up room. You could also just use a Li-po charger from hobby king to charge the Lipo to reduce the amount of electronics :D

Regards,
Jazzman56

Chris Cristini

Mon Oct 06 2014, 12:51PM

Registered Member #1749 Joined: Fri Oct 10 2008, 02:04AM
Location: Claremont New Hampshire
Posts: 497

I like the idea of a boost converter/inverter but worried about further losses here is some pictures of the secondary
]img_20141005_210259.jpg[/file]
]img_20141005_225603.jpg[/file]

Sigurthr

Mon Oct 06 2014, 02:28PM

Registered Member #4463 Joined: Wed Apr 18 2012, 08:08AM
Location: MI's Upper Peninsula
Posts: 597

I think Staci Elaan (spelling?) has a lot of experience with lipo powered SSTCs. You can find her videos on YouTube. Afaik she uses buck/boost converters to step up 3S (12.6v) lipos to a more appropriate primary voltage and runs the coils in low rep rate single pulse fashion to achieve high break out performance while keeping averaged current demands moderate for the batteries.

Eg; boost to ~85V and store energy in bus capacitance and then dump in a single bang. Rep rate limited to 5x time constant formed by boost converter impedance and bus capacitance.

I've wanted to do similar for a long time but I have no experience with DIY DC-DC converters.

Steve Conner

Mon Oct 06 2014, 03:05PM

Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706

Steve Ward's Tesla gun also uses the LiPo batteries sold for RC model applications. I think he uses about 48V worth and steps it up to 300V with a DC-DC converter. Energy for the burst is stored in a bank of electrolytic caps at this voltage.

loneoceans

Mon Oct 06 2014, 04:19PM

Registered Member #4098 Joined: Fri Sept 16 2011, 09:26PM
Location:
Posts: 236

Steve Conner wrote ...

Steve Ward's Tesla gun also uses the LiPo batteries sold for RC model applications. I think he uses about 48V worth and steps it up to 300V with a DC-DC converter. Energy for the burst is stored in a bank of electrolytic caps at this voltage.

I think in Steve's 2nd tesla gun and Phillip's tesla gun, they both use something like 10 or so 6S 2.2AH 25-50C (to clarify, I meant 6S not 6C!) Lipos in series for something like around 200+V directly to the inverter and skipping the need for a boost converter. However I think the limitation right now is the small-size enclosure that you have and it might be tricky to fit a suitable battery inside. The modern LiPos though can supply more than enough power for small SSTCs though.

TwirlyWhirly555

Mon Oct 06 2014, 07:22PM

Registered Member #4104 Joined: Fri Sept 23 2011, 06:54PM
Location: Uk .
Posts: 122

loneoceans wrote ...

I think in Steve's 2nd tesla gun and Phillip's tesla gun, they both use something like 10 or so 6C Lipos in series for something like around 200+V directly to the inverter and skipping the need for a boost converter. However I think the limitation right now is the small-size enclosure that you have and it might be tricky to fit a suitable battery inside. The modern LiPos though can supply more than enough power for small SSTCs though.

At a normal voltage of 3.7V per Cell you would need 54 cells to get 200V , so 9 lots of 6S , even the really small cells would give some output but runs times suffer .

Chris Cristini

Mon Oct 06 2014, 08:08PM

Registered Member #1749 Joined: Fri Oct 10 2008, 02:04AM
Location: Claremont New Hampshire
Posts: 497

Staci elaan's work is pretty cool. Looks like a lower voltage large capacity lipo will be the way to go and prototype a boost converter in to the drive circuit but I'm hoping to get better results with audio modulation with of course lower output power. I am guessing max output would be a slow pulse. I really wish this was possible

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