Why are poewr bricks so bulky?

Discussion in 'MacBook Pro' started by thecritix, Jun 17, 2007.

  1. thecritix macrumors 6502

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    Dec 11, 2006
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    West London, England
    #1
    Please answer, I don't know why and don't understand why apple or a third party cant make the damn things smaller.
    from what i understand they convert (in the uk, 240v ac to 12v dc)
    why does this take such a bulky unit?
    nick
     
  2. NewSc2 macrumors 65816

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    Jun 4, 2005
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    Orange County, CA
    #2
    http://en.wikipedia.org/wiki/Power_brick

    I'm sure Apple's and all other third party's engineers have worked to get the power brick to be as small as possible. Power supplies convert but also have to store energy to ensure a smoother continuous supply.
     
  3. gauchogolfer macrumors 603

    gauchogolfer

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    #3
    The power brick has quite a lot of power being dissipated in it, and that's why it gets pretty warm while being used. If you made it smaller, it would heat up even worse, which the manufacturers try and avoid.
     
  4. JNB macrumors 604

    JNB

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    #4
    Because there's a transformer (240v to 12v, a 20:1 wind ratio), and a rectifier (AC to DC). Someone would have to chime in if the MBP unit (85W) is larger than the MB one (65W). The Apple power brick is about as small as you're going to get though individual dimensions may differ from unit to unit. Also, the quality of build will have some effect - it's expected to last far longer than the batteries it's recharging or the laptop it's powering.

    You oughta see the monster that comes with my Dell!
     
  5. mkrishnan Moderator emeritus

    mkrishnan

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    #5
    I like how at least, Apple goes out of their way to make theirs attractive. They're so much nicer than pretty much anything I've ever seen outside of Apple.
     
  6. flopticalcube macrumors G4

    flopticalcube

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    #6
    Your kidding, right? Considering the wattage it delivers and the fact that it is universal voltage, the Apple power bricks are considerably smaller than most.

    If you are curious, most power bricks are switched-mode power supplies.
     
  7. sycho macrumors 6502a

    sycho

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    Oct 7, 2006
    #7
    Not quite so simple. See post above for the link to information of switching power supplies.
     
  8. showtime macrumors 6502

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    May 10, 2007
    #8
    Yeah, apple's power brick is tiny compared to other manufacturers. In fact, I found it hard to believe when I first saw it. Why don't other manufacturers follow this design?
     
  9. BlueArctos macrumors member

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    Jun 17, 2007
    #9
    You should see the power supply on my Alienware laptop. It physically weighs more than a brick... and it's larger.
     
  10. anirban macrumors 6502a

    anirban

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    Houston, TX
    #10
    Hahah, you obviously havent seen the powerbricks of other brand laptops with the same specs. My HP pavilion laptop weighs in at over 8lbs, and the powerbrick of that weighs no less than 1.5lbs to be honest. Thats a mammoth of a power adapter.

    The MBP and MB powerbricks that I have seen have one of the smallest form factor of all the power adapters around.
     
  11. Fubar macrumors newbie

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    May 19, 2007
    #11
    Why are power bricks so bulky?

    Because of the wizard who lives inside....
     
  12. Nor*Cal macrumors regular

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    Irvine, CA
    #12
    Atleast you only get one power brick, other laptops have 2 or even the powerbrick placed inside the laptop for that toasted feeling.
     
  13. NewSc2 macrumors 65816

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    #13
    The MBP's unit is significantly larger than the MB's. I'd say it's almost twice as large.
     
  14. SkyBell macrumors 604

    SkyBell

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    #14
    My iBook G3's "Brick" is more like a flattened cube. Maybe the diameter of a cupcake, and much shorter.
     
  15. mrkramer macrumors 603

    mrkramer

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    #15
    I'm guessing that they can't make it much smaller because of the heat, they get quite hot while you are using them
     
  16. jdechko macrumors 68040

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    Jul 1, 2004
    #16
    Hey, at least it's smaller than the one that comes with the XBox 360 (though that's not saying much). :p
     
  17. Sopranino macrumors 6502

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    Alberta, Canada
    #17
    Apples powerbricks are the smallest units that exist in the laptop industry. (I've never seen any that are smaller)

    They only get slightly warm, even when under high power loads.

    I rather suspect that Apple has already made them as small as is physically possible.

    Sopranino
     
  18. Wolfpup macrumors 68030

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    Sep 7, 2006
    #18
    Seriously. I can't believe anyone's calling Apple's power bricks BIG. I seriously doubt you could make them any smaller. In fact I worry they go overboard on shrinking them.
     
  19. JHacker macrumors 6502

    JHacker

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    East Coast
    #19
    I absolutely agree with you. They're TINY! Plus, with the snap out pieces that let you wrap the wire around it, it's self contained and beautiful :)
     
  20. Nermal Moderator

    Nermal

    Staff Member

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    New Zealand
    #20
    I had one of those, it was about the same size as an iPod one. The MBP one is much bigger.
     
  21. the Helix macrumors regular

    the Helix

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    Sep 16, 2003
    #21
    New MBP bricks.

    Why are the new MBP bricks so much bigger? Do they really use that much more power to necessitate such a bigger power brick?
     
  22. Nermal Moderator

    Nermal

    Staff Member

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    #22
    The old iBooks were 45 W, and MBPs are 85 W. Almost double.
     
  23. janey macrumors 603

    janey

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    Location:
    sunny los angeles
    #23
    Actually the Apple bricks are pretty tiny and thoughtfully designed too.

    I miss the yo-yo adapter though. I have one floating around somewhere, can't use it anymore. Loved the design, even though it wasn't as convenient as the current bricks.

    Also don't the MBP bricks charge the MacBooks faster? Or something...they are cross-compatible, so...

    The MB adapter is the same size as the iBook adapter. A nice square shape. MBP chargers are too big :p
     

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