Connect with us

Power Supplies - Common Terms and Limitations

What is a power supply (source) and how can I control the voltage and current?

Scroll to continue with content
  1. Gryd3

    Gryd3

    4,098
    875
    Jun 25, 2014
    Gryd3 submitted a new resource:

    Power Supplies - Common Terms and Limitations - What is a power supply (source) and how can I control the voltage and current?

    Read more about this resource...
     
    dorke and Tha fios agaibh like this.
  2. dorke

    dorke

    2,342
    665
    Jun 20, 2015
    I have seen linear regulated wall-warts and actually have a few.
    So, a slight correction in the "how do I pick a good supply?"
    section is needed.something like this:

    "If you need a constant voltage output use a voltage regulated wall-wart"
     
    Last edited by a moderator: May 14, 2016
    Gryd3 likes this.
  3. dorke

    dorke

    2,342
    665
    Jun 20, 2015
    About the issue Constant Current :
    In my view it actually started with protection of the Power Supply against excessive output current which may damage the P.S .
    Most P.S actually only have that over current protection.
    In this case the output voltage is set to zero volts and the current is at it's limit value.

    The more expansive/LAB P.S and LED drivers do have Constant Current Mode with a possible variable current control.

    There is also the"strange creature" -
    Fold-back protection mechanizem ,
    in which both the voltage and current of the P.S are reduced (gradually ,not at once to zero) to protect the Series Regulating Element of the P.S.
     
    hevans1944 and Gryd3 like this.
  4. Gryd3

    Gryd3

    4,098
    875
    Jun 25, 2014
    Thank you for the added details. Although I didn't put them in word-for-word I adjusted some of the wording to cover what you have pointed out to me.
     
  5. hevans1944

    hevans1944 Hop - AC8NS

    4,647
    2,169
    Jun 21, 2012
    Here is a nice article on foldback current limiting. I hate this mode of operation and much prefer that the heat sinks be sized to allow indefinite full current output at zero voltage.
     
  6. dorke

    dorke

    2,342
    665
    Jun 20, 2015
    Agree with you.
    The "Hick-up mode" sounds even more annoying.
    A good article.
     
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Similar Threads
There are no similar threads yet.
Loading...
Electronics Point Logo
Continue to site
Quote of the day

-