Battery charger for LiPo

Discussion in 'Power Electronics' started by srinath99, Dec 21, 2017.

  1. srinath99

    Thread Starter New Member

    Jun 30, 2017
    6
    0
    Hi

    Is there a schematic for a LiPo balance charger circuit ? Can it be simulated on LT-Spice ?

    I want to understand Battery chargers better, could someone provide answers or suggest a resource to following questions
    1)Why does Battery chemistry matter)
    2)How can we set the max charge rate ? (What are consequences of charging fast)
    3) Can charging and discharging happen simultaneously ?

    I want the output of a 3 phase synchronous rectifier to be the input to the balance charger. Are there any precautions i should incorporate ?
     
  2. be80be

    AAC Fanatic!

    Jul 5, 2008
    1,768
    347
    Ask your self one thing would you light a bomb, And hold it bet not
    Don't make a charger for these they use chips made for this.

    Im not saying you couldn't make one I'm saying if your just asking here you need to google
    1 2 and 3 of what you ask these batteries are no joke. They can kill you. Or set you on fire.

    Read up on these
    https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0ahUKEwihotCfkZ3YAhVB6VMKHXc5BRsQFgiZATAA&url=https://rogershobbycenter.com/lipoguide/&usg=AOvVaw3LV8UZqw4pl5N08oTcL7AM

    https://www.maxamps.com/lipo-care.php

    And read this one it has a Ltspice links on the page for a chip
    https://www.digikey.com/product-det...9eNBg7_SzPfHJXDaG2iqwijDkuPmVH1RoCv8MQAvD_BwE
     
    Last edited: Dec 22, 2017
  3. Alec_t

    AAC Fanatic!

    Sep 17, 2013
    9,609
    2,326
  4. crutschow

    Expert

    Mar 14, 2008
    22,029
    6,371
    Each battery chemistry requires a different charge technique to safely charge the battery.
    Use the wrong technique and bad things can happen.
     
  5. eetech00

    Senior Member

    Jun 8, 2013
    1,514
    299
    Absolutely...

    The attached is not a balance charging circuit but demonstrates an LTSpice simulation of a TP4056 LiPo charger.

    TP4056Charger.png

    eT
     
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  6. srinath99

    Thread Starter New Member

    Jun 30, 2017
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  7. allucard11

    New Member

    May 9, 2018
    2
    0
    Hi eetech00, i am trying to simulate a li ion charger but i can´t do a good model from li-ion battery, i see this post of you in 2013 and it is very good the model you use. I don´t understand very well what you do, can you help me with the model of the li-ion battery?
    Thank you.
     
  8. Alec_t

    AAC Fanatic!

    Sep 17, 2013
    9,609
    2,326
    Welcome to AAC!
    Watching a sim of a battery charging, when using an accurate model, is rather like watching paint dry. For most charging sims it is quicker and easier to get results if you simply model the battery as a high value capacitor, e.g. 1 Farad (written as 1, not 1F !!) and use the .ic directive to set its initial voltage at a convenient value.
     
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  9. allucard11

    New Member

    May 9, 2018
    2
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    Thank you, and it is a plesure to be here.
    I do what you say, but i want a more realistic behavior, and the simulation shown by eetech00 is fantastic, and i like that my simulations will be as good as there.
     
  10. Anatoli Panchenko

    New Member

    Sep 10, 2018
    7
    1
    Hi, Is there a simulation model of TP4056 available?
     
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