PFC controller as a capacitors charger

Discussion in 'General Electronics Chat' started by yehezkel2, Aug 4, 2013.

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  1. yehezkel2

    Thread Starter Member

    Oct 2, 2009

    I am thinking of using a PFC boost-converter in order to charge big capacitors off mains power.

    I have read that PFC converters are made for charging a DC-bus of 370 to 390 volts usually, with low accuracy (no voltage regulation)

    In my application I need to charge big 360v capacitors to 360 volts (a bank of about 6000uF, which will be discharged in a short pulse after being charged (every few seconds).
    I aim for charge duration of about 1 second (380J bank charge in 1s = 380 Watts)

    My question is, can it be done ?

    1. How do i set my wanted 360v instead of the usual 390v ? be lowering resistance between the high voltage and the feedback input of the controller ?
    2. By doing the opposite, can I set the PFC converter to charge capacitors to steady 500 volts for example if i had to ?
    3. In theory, with PFC i am using more of the sine wave to charge the capacitor, right ?
      because with a rectifier it will charge only at the top of the sine wave, and doing nothing when the wave voltage is under the capacitor voltage.
      While with PFC it will continuously pump voltage into the capacitor even when the momentary sine wave voltage is lower than the capacitor's.
      am I correct ?
    4. And a good PRO is that my device already has a good Power Factor, and fully compatible with 90-260v AC power :)

    please share your thoughts

    I really like the simplicity of MC33260

  2. t_n_k

    AAC Fanatic!

    Mar 6, 2009
    Are you intending to build a rail gun?
  3. yehezkel2

    Thread Starter Member

    Oct 2, 2009
    The discharge device is a Xenon lamp.
  4. bertus


    Apr 5, 2008

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

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