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24 volt regulator

Discussion in 'Electronic Basics' started by kostas, Feb 20, 2005.

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  1. kostas

    kostas Guest

    Hello. I want to build a simple DC voltage regulator circuit. I don't
    care about ripple because the voltage is from batteries. THe normal
    voltage is 24 but sometimes the voltage goes high at 28. The idea is too
    make a circuit that lets the voltage pass when i have 24 volts and to
    regulate them to 24 when i have 28.


    Any help?
     
  2. You could look into "low dropout regulators" which are linear regulators
    designed to operate with a minimum voltage between the input and output of
    the regulator(across the series pass transistor). I'm not sure what the
    minimum may be...possibly as low as 0.1V which might be ok for you're
    application. Check out
    http://www.national.com/AU/design/0,4706,1_0_,00.html
     
  3. You don't say how much current you need.

    You could use the combination of a linear regulator and a relay. Switch
    in the relay when the voltage gets down below the dropout.

    There are buck regulators that could be used to get you down within a
    volt or so.

    You could also use a shunt regulator, but that would drain your battery
    pretty quickly. A zener diode across the power rails is a form of shunt
    regulator.

    --
    Regards,
    Robert Monsen

    "Your Highness, I have no need of this hypothesis."
    - Pierre Laplace (1749-1827), to Napoleon,
    on why his works on celestial mechanics make no mention of God.
     
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