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trying to build a charging system

Discussion in 'Robotics & Mechatronics' started by bruttis3668, Apr 20, 2012.

  1. bruttis3668

    bruttis3668 New Member

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    my class is building a robot for capstone we have 2 24v dc motors being powered by 2 12vdc drill batteries wired in series to produce the 24 v.
    what i need help with is to build a charging system that uses a 12vdc adapter and when it is plugged in switch the batteries from series to parallel in order for the battery paks to charge.

    any help would be greatly helpful.
     
  2. colin55

    colin55 Well-Known Member

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    This circuit allows to you charge a 24v project from a 12v charger. It converts the two 12v batteries from series to parallel:
    [​IMG]
     
  3. Emilrudin

    Emilrudin New Member

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    Where can i buy that switch and what is the name of it?
     
  4. dave

    Dave New Member

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  5. DerStrom8

    DerStrom8 Super Moderator Most Helpful Member

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    Hi Emilrudin,

    It's a standard DPDT (double-pole, double-throw) switch. Telling you where to buy it is difficult because you didn't put your location in your profile, but I would start with Digikey or Mouser.

    It's a very standard type of switch, there are millions of options out there that would work.
     
  6. audioguru

    audioguru Well-Known Member Most Helpful Member

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    A 12V battery needs a higher charging voltage of about 14V. From a 12V adapter?? No.
    To charge a battery you must limit the current. Where is your current-limiting resistor?
     
  7. Emilrudin

    Emilrudin New Member

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    Hi! I come from Sweden.
    Sorry for bad english!

    But I got 2 wheelchair motors 17.5 amp eatch. So i think i need a switch that coud hadle about 40 a?
     

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