Difference between online and offline P/S?

Discussion in 'General Electronics Chat' started by HawaiianKong, Jan 25, 2012.

  1. HawaiianKong

    Thread Starter New Member

    Jan 25, 2012
    2
    0
    I was asked today what the difference was between an online power supply and offline power supply (as in switching, not UPS), and I couldn't come up with a good answer. Anybody have some input?
     
  2. crutschow

    Expert

    Mar 14, 2008
    13,000
    3,229
    An online switching supply operates directly from the AC mains without an AC mains power transformer. They are relatively light weight because of the absence of the mains transformer. Some of the new, small wall-warts operate that way.

    An offline supply operates from a DC voltage coming from some other source such as a battery or a mains transformer-rectifier.
     
    anhnha and HawaiianKong like this.
  3. HawaiianKong

    Thread Starter New Member

    Jan 25, 2012
    2
    0
    Thanks! I had a vague notion that online meant drawn from line AC, but wasn't sure, and I think I exhausted Google while looking for a concise answer. I'm glad that it's as black-and-white as it sounds.
     
Loading...