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Power & Energy
Forum 12V Low Battery Cutoff
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  • Replies 21 replies
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Related

12V Low Battery Cutoff

logiclevel14
logiclevel14 over 5 years ago

I am looking for the best/lowest current draw way to create a low battery cutoff for a 12v battery powered circuit.  The battery will power a micro-controller and also a number of solenoids that may draw up to 10 amps.  Because of the high amperage draw lithium ion batteries may be out of the question.  I could be wrong but when dealing with a high amperage draw, a NiMh may be the better solution.  The amperage will draw be of a short duration, probably 1 second.  I know it is common for lithium ion batteries to have built in low battery cutoff circuits but when dealing with a standalone NIMh battery or any other generic 12v battery what would be the best way to set up a low battery(10.6v) cutoff?  There are low battery cutoff modules, but I find these to be defective half the time and they draw too much current.  There are low battery cutoff IC's I see but they only deal with low voltage supplies like 5v or less.  Does anyone know of a low voltage cutoff ic that works with 12v batteries?  I may or may not be using a 555 timer and/or an attiny85 microcontroller in the circuit.  Can these devices be used to create a low voltage cutoff?  I programmed an arduino to cutoff the voltage at 10.5 volts using the serial monitor but I could only get this to work when the Arduino was plugged in to computer via usb.  Does serial monitor work with a microcontroller when powered by battery alone or does it need to be plugged into a computer via usb?

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  • genebren
    genebren over 5 years ago +7
    Here is a device that sounds like what you are looking for: http://www.ti.com/lit/ds/symlink/tl7702a.pdf . The TL7712 device is a 12 volt monitor that trips if the voltage drops below 10.8V. Current draw…
  • shabaz
    shabaz over 5 years ago +3
    This is really hard to follow. There's a lot of assumptions here, so in-between those assumptions I'm not confident in the 'probably 1 second' and 10 amps values too. Could you supply a circuit diagram…
  • logiclevel14
    logiclevel14 over 5 years ago in reply to genebren +3
    Thank you gene I think this should do it.
  • shabaz
    shabaz over 5 years ago

    This is really hard to follow.

    There's a lot of assumptions here, so in-between those assumptions I'm not confident in the 'probably 1 second' and 10 amps values too. Could you supply a circuit diagram of what you're thinking of, and the part codes, and what the aim of the circuit is?

    Any circuits or project links you're following, to help progress your project, or is this some completely unique project and you're starting from scratch (not a good idea for a project involving the combination of items you mention).

    All this detail is needed because the answers could change significantly depending on that information.

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  • genebren
    genebren over 5 years ago

    Here is a device that sounds like what you are looking for: http://www.ti.com/lit/ds/symlink/tl7702a.pdf .  The TL7712 device is a 12 volt monitor that trips if the voltage drops below 10.8V.  Current draw is below 20uA, so not too bad there.

     

    Good luck!

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  • logiclevel14
    logiclevel14 over 5 years ago in reply to shabaz

    Yea I do not want to get into to too much detail I am sort of just asking about some ideas on how to create low battery cutoff circuits.  Gene below has posted what I need. 

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  • logiclevel14
    logiclevel14 over 5 years ago in reply to genebren

    Thank you gene I think this should do it.

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  • colporteur
    colporteur over 5 years ago in reply to shabaz

    Another satisfied customer. Create an account and in less than 12 hours you get an answer.

     

    Maybe it will produce and active member?

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  • shabaz
    shabaz over 5 years ago in reply to colporteur

    Is that a question to me?

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  • logiclevel14
    logiclevel14 over 5 years ago in reply to colporteur

    are we hurting for active members?

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  • colporteur
    colporteur over 5 years ago in reply to shabaz

    I thought your comments were valid. I was disappointed in the posters response. My impression, "No I don't want to answer your questions, besides I already got an answer." The original post was fractured and difficult to follow. It gave no indication of confidentially. It was a question looking for an answer that with the barest minimum of investment.

     

    The question, rhetorical at best.

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  • colporteur
    colporteur over 5 years ago in reply to logiclevel14

    Yes, the community is always looking for new members. Active would be members willing to  contribute as wells satisfying there own needs. Active members are most welcomed.

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  • shabaz
    shabaz over 5 years ago in reply to colporteur

    Agree, there's only finite time to help (it's like housekeeping, it needs doing so we can all move forward) so sometimes when it's clear there's an issue (rightly or wrongly) delivering information (it's a normal life experience anyway - I see it in industry occasionally but not often, but I'm extremely confident enough to handle it), it's better to spend the time seeing what others are up to or carrying on with work..

    I spent the evening tonight building a thermometer! - might write it up tomorrow if I get some time, it's my first attempt at any accurate thermometer, and I'm only guessing if I got the enclosure right (to measure air temperature).

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