Battery charger - power supply issue affecting ADC

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  1. - 3rd December 2007, 10:52 #1
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    I repeat again that, your final design might look like a Linear Power Supply.

    As such, a NPN pass transistor is the usual choice. The transistor acts like a voltage follower, so whatever voltage is present at the base, that voltage-0,7 is presented at the emitter, with current amplification of course.

    Ioannis
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  2. - 3rd December 2007, 12:44 #2
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    Talking "KISS" ??? yess ... but without Pic !

    Hi, Ioannis

    just have a look to the NS Datasheet of the LM 350 page 10 ... there is a very simple Pb batt charger design ... easily usable with the 317 or 338 ( Paper datasheets included it in the 1982 Databook release ...).
    fits the I - V charging method ... Roger looks for ...

    But do not tell Roger ... he is a friend ...

    Alain
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  3. - 3rd December 2007, 13:23 #3
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    Hi Alain. Between us, yes there is a simple charger and many more everywhere!

    But Roger is looking for something to be controlled by his darling PIC. So, I can understand him trying to emulate a pot with an electronic pot. But this is not going to work as he is expecting... But don't tell him either! He is a friend and might be hurt!

    Ioannis
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  4. - 3rd December 2007, 13:38 #4
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    Hi, Ioannis

    Let's be honest ... It CAN work ...

    but it will ever be for his own pleasure ... and impossible to sell .

    the BTI CCS 9620 SL is the living proof it can work ... It's a dedicated Pic !!! ( probably 16HV xxx )


    Always the same : Amateur or pro ... solutions are not the same !!!

    Alain
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    Why insist on using 32 Bits when you're not even able to deal with the first 8 ones ??? ehhhhhh ...
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    certainly the answer is " RTFM " or " RTFDataSheet " !!!
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  5. - 3rd December 2007, 13:52 #5
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    I agree Alain. I usually think on terms of reliable commercial product, that is well in the middle of the specs.

    It can work with little tricks and magic, but I won't trust it. Especially with the lead batteries!

    On the other hand the idea of the linear power supply is so simple... And prooved reliable.

    The Pic will only have to create the Vref and then a comparator will adjust the base voltage of the pass transistor. Thats it!

    Ioannis
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  6. - 3rd December 2007, 13:56 #6
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    He,he

    You just forgot the Battery tempco compensation ...

    ( -20 mv/ cell / deg C ... to be verified ! )

    seriously ... a High end Lead Acid Charger is a piece of cake !!!

    Alain
    ************************************************** ***********************
    Why insist on using 32 Bits when you're not even able to deal with the first 8 ones ??? ehhhhhh ...
    ************************************************** ***********************
    IF there is the word "Problem" in your question ...
    certainly the answer is " RTFM " or " RTFDataSheet " !!!
    *****************************************
  7. - 3rd December 2007, 14:06 #7
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    Mmm, I really love to have one
    Quote Originally Posted by Acetronics View Post
    piece of cake !!!
    Seriously, yes it is. But not the way that Roger is doing it with that pot!

    Ioannis
    www.signalcom.gr
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