how to obtain -12/+12 from two smps ?

Discussion in 'General Electronics Chat' started by egemen, May 17, 2011.

  1. egemen

    Thread Starter New Member

    May 10, 2011
    3
    0
    hello,

    I have two +12 V smps which are identical.They have com,ground,+v terminals.
    how can I get -12v/+12 using these smps.Sorry for this stupid question but my I can not come up with a solution.

    Best regards
     
  2. Wendy

    Moderator

    Mar 24, 2008
    20,766
    2,536
    On one SMPS have ground connected to +, it will be a negative power supply. On the other SMPS have ground connected to -, it will be the positive power supply. Use the grounds on the SMPS terminals.

    Then connect the grounds together.

    I am assuming com is the - terminal, and it is not already connected to ground. Please post the datasheets for the power supplies.
     
  3. egemen

    Thread Starter New Member

    May 10, 2011
    3
    0
    I dont have datasheets but you are right comm are - terminals.ı will try your solution and reply back.thank you..
     
  4. egemen

    Thread Starter New Member

    May 10, 2011
    3
    0
    it worked well!!
     
  5. Wendy

    Moderator

    Mar 24, 2008
    20,766
    2,536
    Most good power supplies are floating. Ones like the old HP brands had a jumper that could connect their ground to either the plus or minus jacks. The really good ones have voltage sense lines that let you regulate the voltage at the point of use.
     
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