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  1. anhnha's Avatar
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    #1

    off-line power supply

    Here is the definition of "off-line power supply" from a site:
    Off-line Power Supply:
    1) A power supply in which the ac line voltage is rectified and filtered without using a line frequency isolation transformer.
    2) A power supply switched into service upon line loss to provide power to the load without significant interruption. Also called Off-Line Switchers (OLS).

    How would you understand the word "off-line" here?

  2. Tarheel's Avatar
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    #2

    Re: off-line power supply

    I would think that an off-line power supply is one that you use when your regular service has been interrupted.. Does that make sense to you?

  3. anhnha's Avatar
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    #3

    Re: off-line power supply

    Thanks. I've got it now. By the way, I've just found the definition below from an electronics forum:

    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.

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