Help building a boost converter

Discussion in 'The Projects Forum' started by Darkraver, Apr 2, 2012.

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  1. Darkraver

    Thread Starter New Member

    Apr 2, 2012
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    Hey guys,

    I'm trying to build a boost converter to charge up the capacitors for a school project, but I don't seem to have very much success. I'm trying to boost 12v up to 750V, which requires a duty of 98.5% if my calculations are right. With the use of some online calculators (namely: http://www.daycounter.com/Calculators/Switching-Converter-Calculator.phtml and) I got an inductor value of 42mH, and have a 100mH inductor plugged into my boost converter to test. The capacitors I have plugged into the output are two 100uF caps rated at 450V in series. (The final capacitors I need to charge are 4050uF rated at 800V) But when I measure the output, I get only 0.655V.

    I can't seem to figure out why I am not getting any useful values, can any of you help?

    Thanks
     
  2. Darkraver

    Thread Starter New Member

    Apr 2, 2012
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  3. rfredel

    New Member

    Jan 23, 2011
    25
    3
    Hello,

    the problem is, that your boost converter has not enough power to charge the capacitor.
    An emty capacitor is like a short circuit for your supply.

    It's better to use a converter with a transformer so you have more Power to charge the capacitor.
    I'll look for a circuit, that was used in a Photoflashlight. I must draw this diagram, because I have built it 40 years ago.
    After finishing the drawing I'll post it.

    Regards

    Rainer

    PS: Sorry if my English is too bad.
     
  4. bertus

    Administrator

    Apr 5, 2008
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    Hello,

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

    Quote:
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