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Old Mar 08, 2011, 03:28 AM
Merog is offline
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Help!

Can we get 1S power from 2S LiPo?


Guys, this may look strange but I need it. Is there any way to get a 1S power (3.7v) from a 2S (7.4v) LiPo?

This thing I need to power my key chain cam externally from on board airplane main LiPo.

Awaiting replies....//MEROG
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Old Mar 08, 2011, 03:43 AM
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If your pack has a balance plug, the answer is yes. The balance plug should have three pins, and you simply need to get a mating socket and connect any two adjacent pins.

However, if you do this you need to be very careful. The camera's current draw should be very small compared to what the motor and radio are drawing, otherwise the LiPo cells will go way out of balance, and the cell that's running the camera might be damaged by over discharging because it won't have the lvc protection that's built into the ESC. Don't forget to disconnect the camera from the battery the same time as you disconnect the power system.
Old Mar 08, 2011, 03:58 AM
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That will work and has the advantage of no additional weight. The other way is to build a simple voltage regulator to feed the camera. Only a few components and a couple of minutes work.

Steve
Old Mar 08, 2011, 04:54 AM
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Quote:
Originally Posted by slipstick View Post
That will work and has the advantage of no additional weight. The other way is to build a simple voltage regulator to feed the camera. Only a few components and a couple of minutes work.

Steve
abenn's suggestion may have a risk. Then steve, any schema to build a regulator?
Old Mar 08, 2011, 05:05 AM
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Quote:
Originally Posted by slipstick View Post
That will work and has the advantage of no additional weight. The other way is to build a simple voltage regulator to feed the camera. Only a few components and a couple of minutes work.

Steve
i would go for the voltage regulator option if it were me

other way has the ability to throw a pack out of ballance easily
Old Mar 08, 2011, 08:24 AM
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Quote:
Originally Posted by Merog View Post
abenn's suggestion may have a risk. Then steve, any schema to build a regulator?
What exact voltage and current do you need ? If you can use 5V and 100mA or less then a 78L05 will work. E.g http://www.national.com/mpf/LM/LM78L05.html#Overview

Like I say, not many components .

Steve
Old Mar 08, 2011, 09:16 AM
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Removed as it's incorrect info ..
Last edited by baratta930; Mar 08, 2011 at 11:41 AM.
Old Mar 08, 2011, 09:41 AM
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Originally Posted by baratta930 View Post
Another option is if you're not going to draw much current (<2A) then just parallel the balance outputs. You'll get 1S power and not risk unbalancing the pack.
They are already wired in series, all that will do is short the pack (DO NOT TRY!)...

Jack
Old Mar 08, 2011, 10:46 AM
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http://www.dimensionengineering.com/AnyVoltMicro.htm

If you try and take power from just one of the cells the pack will become out of balance.
Old Mar 08, 2011, 11:41 AM
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Originally Posted by jfetter View Post
They are already wired in series, all that will do is short the pack (DO NOT TRY!)...

Jack
oh yeah, didn't think before posting ... sorry about that.

I'll edit my original post to remove it ...
Old Mar 08, 2011, 12:50 PM
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ok guys, so strictly not going to use from 2S. Trying to buy a 1S.

Thank you


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