transformerless battery charger

Discussion in 'The Projects Forum' started by stevecoats, Feb 6, 2012.

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  1. stevecoats

    Thread Starter New Member

    Feb 5, 2012
    I would like to build a battery charger for my boat really cheap but talented (20-30A and regulated). My boat is in an area that things have a tendency to disappear. A $50 20A battery charger seems to mysteriously levitate and float away and I want to leave it there and not worry about it. I'm thinking a full bridge rectifier directly out of an existing GFI recepticle into a pwm controller driving a 400v 30A power FET that I have a few lying around. I was thinking of using a 555, but I think that I should use a frequency of about 1M Hz. Maybe the vco of a 4046? I have looked through the forum and not found anything quite up to snuff. Any suggestions?
  2. SgtWookie


    Jul 17, 2007
    An excerpt from our Terms of Service:

    Transformers (or some form of inductive coupling; as in a broadband transformer) are required to provide galvanic isolation from mains power to the output. It's a critical safety feature

    Besides that, your scheme simply would not work.
  3. bertus


    Apr 5, 2008

    I am closing this thread as it violates AAC policy and/or safety issues.


    6. Restricted topics. The following topics are regularly raised however are considered “off-topic” at all times and will results in Your thread being closed without question:

    Any kind of over-unity devices and systems
    Automotive modifications
    Devices designed to electrocute or shock another person
    LEDs to mains
    Phone jammers
    Rail guns and high-energy projectile devices
    Transformer-less power supplies

    This comes from our Tos:
    Terms of Service

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