• State
  • Locked Locked
  • Replies 2 replies
  • Subscribers 63 subscribers
  • Views 526 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Using lipo or a similar battery as embedded short time backup system

Joel Foreman
Prodigy 20 points


Hello,

My problem is this:

I am looking at the possibility to use a lipo or similar battery as a short time backup system for a project. The battery needs to supply enough power so the system is able to save critical data and shut the project down properly at the moment a power fail occurs (system normally runs on the grid). For this around 200 to 400mA is needed at 5 volt for around 10 seconds (rough estimation).
So basically the idea is to keep the battery charged until a power fail occurs. At this moment the battery is to take over for around 10 seconds.

previously a couple of large capacitors were used to solve this problem. however these require alot of space.

I have been looking around and got really confused at al the managing, monitoring and charging options. So my question is, are there any application notes or specific IC's design for this kind of application ?


Btw the reason i am looking at the lipo batteries is the high power density so the battery can possible be quite small for this application.

Best regards, Joel

  • 0
    TI__Intellectual 2065 points
    You might want to look at our battery university for more detailed understanding.
  • 0 in reply to MS1291
    Prodigy 20 points

    Hello,

    thanks for your reply, there are some usefull videos there.


    The requirements have changed slightly. The plan is to be able to sustain a longer period of time (about an hour).
    After watching the videos and reading the data sheets of some management IC's, I still have one question:

    In the videos they focus only on applications with many battery cycles, however for a power fail feature the battery will not go through mutch cycles at all. It will mainly be charged all the time, and only come into play when the grid power fails. Will this have any effect on the battery life ? i was thinking of using LiFe (or LiFePo) batteries because they seem alot safer and the power density loss is not that big of a problem for my application.