Combining two ac sources rectifier

Discussion in 'General Electronics Chat' started by Vindhyachal Takniki, Apr 29, 2015.

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  1. Vindhyachal Takniki

    Thread Starter Member

    Nov 3, 2014
    1. I have two ac sources(from mains & generator) & have to run a circuit from it for which I need dc supply
    I had connected a bridge rectifier to each source. After that each output is shorted.
    2. Circuit is attached. It Actual circuit also has regulator & othe stuff, which i didn't show, I had only connected Rload & C.
    3. There may be three cases: Only main available, only generator available, or both are available.
    4. Is the circuit attached is safe.
    5. I think problem may arrive when both ac sources are available.
    Also it could be one may be at different angle then other. Like if first ac source have crest, other couls have trough or at some phase from each other.
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  2. pwdixon


    Oct 11, 2012
    I think it will take the current from the highest source voltage at any moment. I'm not sure how wise it is to be rectifying mains voltages though, looks dangerous to me and might go against forum rules.
  3. Ramussons

    Active Member

    May 3, 2013
    In principle, the setup is OK, But very unsafe.

    The load is electrically floating and all parts are live. You cannot earth, even accidentally, any part of the "load".

    You need to use 1:1 isolation transformers from the 2 sources to avoid accidental electr0cution.

    And as pwdixon mentioned, this discussion's fate is known :eek:
  4. DickCappels


    Aug 21, 2008
    Transformer-less Power Supplies

    Your thread revolves around a restricted topic, as can be read in the Terms of Service of the forum, Chapter 6:

    The AAC administration has chosen not to allow discussions on transformer-less power supplies, hence this thread is closed.
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