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Thread: Uninterrupted hot swap Lipo battery with other DC source.

  1. #31
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    Re: Uninterrupted hot swap Lipo battery with other DC source.

    Quote Originally Posted by JonHylands View Post
    I've heard that you can reset the AX-12's in software when they stop working, by disabling and then re-enabling torque. I haven't tried this myself yet, so I can't say for certain that it works.

    - Jon
    I tested this out tonight. The max torque gets set to 0, which is why you "lose" movement. All you need to do is set the max torque on the AX-12 in order to regain control of it. You probably want to check the current position, load & temp before doing so, maybe even set a new goal position, as the AX-12 will go straight to it's goal position once max torque is reset.

    Cheers!

    Last edited by kamondelious; 03-01-2010 at 09:36 AM. Reason: removed unneeded part of quote

  2. #32
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    Re: Uninterrupted hot swap Lipo battery with other DC source.

    Oh excellent. I was just fiddling with torque enable.

  3. Re: Uninterrupted hot swap Lipo battery with other DC source.

    Is there some big problem with just using a pair of diodes? Just size the diodes appropriately to handle the current demand, while still having an acceptable voltage drop.


  4. #34
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    Re: Uninterrupted hot swap Lipo battery with other DC source.

    The diodes prevent the power sources from attempting to "charge" each other?

  5. Re: Uninterrupted hot swap Lipo battery with other DC source.

    Yes, there is a problem with using Diodes. The voltage drop can be a significant problem in some circumstances. In our Brainbot robot, using a Diode pair (with 0.4 volt drop) has a noticable effect on available battery capacity. It also wastes power through heat.

    The most annoying problem, though, is you can't use a wall power supply properly. Most 12 volt battery packs have a fully charged voltage somewhat higher than 12.0 volts. I have a 17 amp 12 volt wall power supply that I use to power Brainbot while it is on the bench. When I use that, I have to unplug all the batteries, because the diode pair chooses the source that is a higher voltage rather than the source I "want" it to choose.

    My aux. power board (which is now available) solves all of these issues...

    - Jon
    "The best way to predict the future is to invent it." - Alan Kay, inventor of Smalltalk

  6. Re: Uninterrupted hot swap Lipo battery with other DC source.

    Jon, did you complete the power board that you were talking about?

    I would be interested in purchasing one, but have not been able to find a link.

    thanks!

  7. Re: Uninterrupted hot swap Lipo battery with other DC source.

    I haven't been able to find a link to Jon's board either, but I did run across this when looks interesting:
    http://www.mini-box.com/Y-PWR-Hot-Sw...ing-Controller

    michael

  8. #38
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    Re: Uninterrupted hot swap Lipo battery with other DC source.

    That looks very interesting.

  9. #39
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    Re: Uninterrupted hot swap Lipo battery with other DC source.

    Not sure if I'd buy one, but here is Jon's board.
    Please pardon the pedantry... and the profanity... and the convoluted speech pattern...
    "You have failed me, Brain!"
    [git][mech][hack]
    gives free advice only on public threads

  10. Re: Uninterrupted hot swap Lipo battery with other DC source.

    Quote Originally Posted by msprague View Post
    I haven't been able to find a link to Jon's board either, but I did run across this when looks interesting:
    http://www.mini-box.com/Y-PWR-Hot-Sw...ing-Controller

    michael
    thanks for the info! That looks very useful!!

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