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Lipo cut off circuit - Practical Electronics magazine - November 2021 EmptyThu Dec 16, 2021 2:20 pm by david f

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    Lipo cut off circuit - Practical Electronics magazine - November 2021

    david f
    david f
    AMS Treasurer


    Posts : 2214
    Join date : 2010-11-10
    Age : 71
    Location : Cumbria

    Lipo cut off circuit - Practical Electronics magazine - November 2021 Empty Lipo cut off circuit - Practical Electronics magazine - November 2021

    Post  david f Fri Oct 01, 2021 3:15 pm

    This looks like a good circuit for Lipo users since it will prevent wrecking your Lipos because of excessive discharge. (Happened to me once and its annoying.)

    Lipo cut off circuit - Practical Electronics magazine - November 2021 Ciruit12


    This is a fragment of the article which looks promising. A comparator to monitor battery voltage and a Mosfet to switch on and off. Full details are in the magazine and you can order a Printed Circuit Board from them:

    https://www.electronpublishing.com/

    The design is for two batteries but it also shows how you can reduce the components for a single battery.

    The on/off switch could also be useful for model submariners. A normally closed reed switch and a magnet will form a handy external switch.

    David
    david f
    david f
    AMS Treasurer


    Posts : 2214
    Join date : 2010-11-10
    Age : 71
    Location : Cumbria

    Lipo cut off circuit - Practical Electronics magazine - November 2021 Empty Re: Lipo cut off circuit - Practical Electronics magazine - November 2021

    Post  david f Sat Dec 11, 2021 12:13 pm

    I ordered two of these boards a few weeks ago and I have just built one of the circuits and it seems to be working fine at initial switch on.

    https://www.electronpublishing.com/product-category/pcb-service/projects-2021/november-2021/

    Lipo cut off circuit - Practical Electronics magazine - November 2021 20211210

    I have also ordered a couple of these:

    12V 10A Undervoltage Protection Module Low Voltage Cut off Automatic Switch On Recovery Storage Battery Board

    https://www.banggood.com/12V-10A-Undervoltage-Protection-Module-Low-Voltage-Cut-off-Automatic-Switch-On-Recovery-Storage-Battery-Board-p-1888819.html?utm_design=18&utm_email=1639055724_2324&utm_source=emarsys&utm_medium=Shipoutinform190813&utm_campaign=trigger-logistics&utm_content=leander&sc_src=email_2671705&sc_eh=de4a6caa098594c51&sc_llid=32802253&sc_lid=104858042&sc_uid=jpNDqOCzO7&cur_warehouse=CN

    It will be interesting to see how they compare - small size etc.

    My intention is to protect Lipos in my small subs and the Practical Electronics circuit has the advantage of being able to add a magnetic "on" switch very easily.

    More later.

    David
    david f
    david f
    AMS Treasurer


    Posts : 2214
    Join date : 2010-11-10
    Age : 71
    Location : Cumbria

    Lipo cut off circuit - Practical Electronics magazine - November 2021 Empty Re: Lipo cut off circuit - Practical Electronics magazine - November 2021

    Post  david f Thu Dec 16, 2021 2:03 pm

    I am not having too much success with getting the PE circuit to work the way I want it too. (A lot of smoking components - the regulator and MOSFET mainly and I am running out of spares.)
    I think I will give this project a rest until the New Year!

    And I've just put these on order on eBay (DIY is often the difficult and expensive option nowadays!):

    3s 25A 18650 Lithium Battery BMS Protection Board Circuit Charging Module

    https://www.ebay.co.uk/itm/154481761875?hash=item23f7d49e53:g:ZY8AAOSwSF5gu-OM

    David

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    SimonH


    Posts : 45
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    Location : Nottingham, UK

    Lipo cut off circuit - Practical Electronics magazine - November 2021 Empty Re: Lipo cut off circuit - Practical Electronics magazine - November 2021

    Post  SimonH Fri Dec 17, 2021 8:57 pm

    have you got access to a bench psu with current limit? that should limit any fault current due to the module to a smoke-free limit. Alternative is a fuse but in electronics its well known that any transistor is 'the fastest fuse on 3 legs' but it might protect untill you get the bugs sorted.
    Also a good DVM as the voltage difference between full & empty for some battery chemistry can be minimal, as I guess you already know.

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    tsenecal
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    Lipo cut off circuit - Practical Electronics magazine - November 2021 Empty Re: Lipo cut off circuit - Practical Electronics magazine - November 2021

    Post  tsenecal Tue Dec 21, 2021 3:40 pm

    The chinese sellers on ebay can do a much better job making lipo charging/regulating/monitoring circuits than i can for much less money than i can... in addition to all that, all the ESCs i use understand and work well with Lipos, so the BMS i buy are for adapting things like existing Engel ballast tank controllers, so that they don't overly deplete the Lipos i use with them.

    david f likes this post


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