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  1. #1
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    Controlling Charging /Discharging current of Supercapacitor with a DC-DC converter

    Hi Everyone!

    Please tell me how will I control the charging current of a Supercapacitor Bank using a DC-DC converter.

    Connecting a suitable value and wattage resistor I can control the charging current but this will be an inefficient method.

    I want to charge a supercapacitor bank from a 3V supply till 5V via a boost converter.
    The max. current output of the 3V supply can be 500mA.

    I plan to make a boost converter using MC34063.

    How can I limit the output current of the boost converter to max. Say 200mA.
    Genius is eternal patience.

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    Re: Controlling Charging /Discharging current of Supercapacitor with a DC-DC converte

    ICL chip will work from Digikey NTC Res
    The best question deserves a better answer.
    Be kind to others helpedme & [solved]
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    •   Alt28th August 2012, 01:31

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    Re: Controlling Charging /Discharging current of Supercapacitor with a DC-DC converte

    Thanks for the reply.

    What's an ICL chip and how it works?
    Can you please name a few popular ones?
    Genius is eternal patience.



    •   Alt30th August 2012, 13:59

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    Re: Controlling Charging /Discharging current of Supercapacitor with a DC-DC converte

    Quote Originally Posted by SunnySkyguy View Post
    ICL chip will work from Digikey NTC Res
    i can't google it also what is it ????\

    what is ICL chip can you pls explain a little
    JEFFREY SAMUEL
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    •   Alt30th August 2012, 15:00

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    Re: Controlling Charging /Discharging current of Supercapacitor with a DC-DC converte

    Perhaps it stand's for input current limiter.
    Genius is eternal patience.



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    Re: Controlling Charging /Discharging current of Supercapacitor with a DC-DC converte

    Greeting to everyone!

    Can I use TL431 or LM317 as current limiter while charging the supercap bank from a low current supply.
    Genius is eternal patience.



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    Re: Controlling Charging /Discharging current of Supercapacitor with a DC-DC converte

    LM 317 is a constant current source and it can be used to provide a constant current to the super cap

    TL 431 is a shunt voltage reference

    better go with LM 317 as a source
    JEFFREY SAMUEL
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    Re: Controlling Charging /Discharging current of Supercapacitor with a DC-DC converte

    Thanks Jeffrey!

    My intention is to limit the charging current of the supercapacitor bank with minimum losses.
    If I use LM317 it will waste a lot of energy as heat.

    The charging source will be hand cranked PMDC motor which will act as a DC generator.

    Say my DC generator is generating 0.5V -4V depending on the cranking speed.I am using a DC-DC converter to step it up to 5V[The converter will start working at 1.5V] so that power generated even during low cranking is utilized to charge the supercap.

    So what you are suggesting me that I shall use a LM317 in between DC_DC converter and the supercap bank to limit the current.
    Untitled.png
    I can also limit the current by using a Carbon resistor of suitable value.
    So, what advantage I will gain over carbon resistor method.

    Please clarify.
    Genius is eternal patience.



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    Re: Controlling Charging /Discharging current of Supercapacitor with a DC-DC converte

    The best question deserves a better answer.
    Be kind to others helpedme & [solved]
    Ohm's Law of life... Tony Stewart EE since 1975


    1 members found this post helpful.

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    Re: Controlling Charging /Discharging current of Supercapacitor with a DC-DC converte

    i am wondering if you want the simulink model or you want the circuit , or have u had your question answered



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