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3337 Views 2 Replies Latest reply: Jul 30, 2014 8:16 AM by MartinB RSS
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Jul 17, 2014 8:50 PM

Best Way to Limit Current

Hi guys, I have a battery with a rating of 12V 70A, what is the best and simplest way to limit the current to 2A?

 

Thanks!

  • LanceLK Novice 68 posts since
    Apr 4, 2014
    Currently Being Moderated
    Jul 22, 2014 11:36 PM (in response to Riley)
    current limiting

    Have you tried using a slow blow 2A fuse in series with the load? I think that would work...

  • MartinB Novice 1 posts since
    Mar 6, 2014
    Currently Being Moderated
    Jul 30, 2014 8:16 AM (in response to Riley)
    current limiting

    The easiest way would be resistors, but the 6Ohm in you case produce  quite some power dissipation of 24W which you waste (and heat).

    The resistor would limit inrush as well as continous currents though.

    If you are looking for an overcurrent protection you may use a fuse as suggested by Lance.

    You  could also look into PTC Resettable Fuses, there are products that work  on 12V, 70A max and Ihold of 2A - if this is the operating current you  allow.

    You would still need to look at the transient behavior and  ambient temperature of the PTC, but even a fuse has I2t you need to  consider.

    Last but not least you could look into active solutions such as load switches or similar.

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