Buck converter

Discussion in 'General Electronics Chat' started by Johnjacob1992, Nov 24, 2015.

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  1. Johnjacob1992

    Thread Starter New Member

    Feb 27, 2015
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    Im building an ac/dc converter for a battery charger, it takes in 120V AC in and outputs 90V DC at 20A max. To further improve the output performance of the buck converter, i decided to build a pi filter containing 2 capacitors and an inductor..it is essentially used to filter harmonics at at 100 kHz. What do you think of the schematic? fff.JPG
     
  2. Roderick Young

    Member

    Feb 22, 2015
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    If that ground shown is an earth ground, this will have problems, due to lack of an isolation transformer. The full line current will flow through a diode at one point in the cycle. I'm not sure if it's still against policy to discuss non-isolated off-line power here - it was at one time.
     
  3. Dodgydave

    Distinguished Member

    Jun 22, 2012
    4,984
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    As long as your input AC is from an isolation transformer, your ok, if your thinking of using a transformerless mains input, forget it, Too Dangerous
    ...
     
  4. DickCappels

    Moderator

    Aug 21, 2008
    2,651
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    To what use will you put this power supply? -Will the load be floating?
     
  5. crutschow

    Expert

    Mar 14, 2008
    13,006
    3,232
    Why are you concerned about harmonics in a battery charger?
     
  6. DickCappels

    Moderator

    Aug 21, 2008
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    On second thought, this is exactly the kind of mains powered project that is prohibited by the User Agreement.
    http://www.allaboutcircuits.com/user-agreement/

    Excerpt:

    Restricted topics. The following topics are regularly raised however are considered "off-topic" at all times and will result in Your thread being closed without question:
    • Any kind of over-unity devices and systems
    • Devices designed to electrocute or shock another person
    • LEDs to mains
    • Phone jammers
    • Rail guns and high-energy projectile devices
    • Transformer-less power supplies
     
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