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Universal Li-ion charger with ATX power supply

szon 7893 12
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  • Universal Li-ion charger with ATX power supply
    Hello, I wanted to present one more project using an ATX power supply and in my case AT. I made him a battery charger. Li-ion up to and including 5S. I looked at Interk a little and did not find anything similar, so I think it is my project, so to speak. I used it to automatically turn on the fan so that it does not make unnecessary noise, and the module to detect a charged battery pack and of course the balancer http://www.zajic.cz/omezovac/omezovac.htm. To power the fan control module and the charging module I used a LED bulb power supply giving 22V, lowered it to 12V. The rotary switch controls the power supply voltage by selecting the RX resistor and including it in the appropriate balancer sections. I also used a second error amplifier in the TL494 circuit to regulate the charging current, and after charging the charge module connects 4.7k in parallel to R1 4.7 resistors reducing the current to a very small value. The project is practically checked.
    Universal Li-ion charger with ATX power supply Universal Li-ion charger with ATX power supply Universal Li-ion charger with ATX power supply Universal Li-ion charger with ATX power supply
    Universal Li-ion charger with ATX power supply Universal Li-ion charger with ATX power supply Universal Li-ion charger with ATX power supply

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    About Author
    szon
    Level 17  
    Offline 
    szon wrote 473 posts with rating 70, helped 22 times. Live in city Kielce. Been with us since 2003 year.
  • #2
    Sentox
    Level 11  
    Nice design. How's the current efficiency?
  • #3
    szon
    Level 17  
    Current efficiency is high, it is known that a computer power supply has, as I wrote, I used a second error amplifier to set the current at 1A. the other amplifier in a typical power supply is blocked. Without it I couldn't connect the batteries directly because I would have cooked them. It was possible to set the charging current with a resistor but I decided to do it professionally.
  • #4
    rsv6
    Level 5  
    I'm just missing a specific balancing module that you could adjust from scratch. There are a lot of modeling chargers, however, the balancing power does not exceed 0.2a to 1A on targets. A balancer that could load each target independently up to 10A could be used.
  • #5
    szon
    Level 17  
    I don't know what you mean. As I wrote on the second error amplifier, I made adjustments to the charging current, I set the current to 1A, I could have set it to a different value. I could also install a potentiometer for current regulation but I found it unnecessary.
  • #6
    lechoo
    Level 39  
    rsv6 wrote:
    I'm just missing a specific balancing module that you could adjust from scratch. There are a lot of modeling chargers, however, the balancing power does not exceed 0.2a to 1A on targets. A balancer that could load each target independently up to 10A could be used.

    I can already see those 10A flowing through the thin cables and delicate balancing connectors in the modeling package ...
  • #7
    rsv6
    Level 5  
    And who said they would be thin. It is important to be able to adjust the balancer current.
  • #8
    szon
    Level 17  
    rsv6 wrote:
    And who said they would be thin. It is important to be able to adjust the balancer current.

    You have no idea. In my case there is no such thing as balancer current regulation. The balancer is used to charge individual cells to the same value, and prevents overcharging a cell, which is dangerous in this case.
  • #9
    dawidxcom
    Level 7  
    The charger loads each target separately or the whole package and only balances
  • #10
    szon
    Level 17  
    The charger loads the package and balances. In addition, I write that the charge detection system monitors 2, 3, or 4 cells. I gave up monitoring 5 cells so as not to complicate the system because if you charge 5 cells, you can let go of one of them.
  • #11
    dawidxcom
    Level 7  
    It's not what I expect b planning a 13-cell charger
  • #12
    keseszel
    Level 26  
    Could you do the characteristics of the current and charging over time .. How long does the charging itself, as it selects the current.
  • #13
    szon
    Level 17  
    I wrote about it in the project description. I used a second error amplifier in the TL system to set the charging current ... which is blocked in a typical power supply. at
    I set the current at 1A using a resistance divider. At the end of charging, the current drops slightly. Charging takes quite a short time did not measure time, it also depends on the level of accu discharge. You can also if someone is in a hurry to set a larger current or make two quick and slow charges selected with a switch. [/ Img]