High voltage, High capacitance Capacitors

Discussion in 'Power Electronics' started by artmaster547, May 11, 2017.

  1. artmaster547

    Thread Starter Member

    Jan 6, 2016
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    Hi All I am designing a 3.5kW Charger and trying to source a capacitor for a boost power factor correction converter I am designing. I have come into a bit of problem for the design I need a capacitor with the following properties/ratings: Vdc: 450 V and capacitance of 470uF, I believe usually metal film capacitors are used for this application. I am not bothered about space taken up I know it's going to be big, however I need this capacitor to mount onto a PCB. I was wondering if anyone knew of any capacitor that meet those ratings, or if anyone can suggest what would be a suitable solution, if I say got a load of electrolytic capacitors and then used one small metal film capacitor would that be suitable? I am very new to design so if anyone had any suggestions of what I could do would be greatly appreciated.
    Thanks

    Art
     
  2. R!f@@

    AAC Fanatic!

    Apr 2, 2009
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    Why metal film ?
    PFC cap is always Electrolytic.
     
  3. shortbus

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    Sep 30, 2009
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  4. R!f@@

    AAC Fanatic!

    Apr 2, 2009
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    Strange.. I never came across metalized ones in a PFC circuit in TV, A/C's or any other.
     
    shortbus likes this.
  5. artmaster547

    Thread Starter Member

    Jan 6, 2016
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    So is it possible to just parallel up a load of capacitors that have the voltage rating, to get the capacitance I am after? Thanks
    Art
     
    Last edited: May 18, 2017
  6. R!f@@

    AAC Fanatic!

    Apr 2, 2009
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    How does paralleling resistors gets you capacitance ??o_O
     
  7. artmaster547

    Thread Starter Member

    Jan 6, 2016
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    Ah! sorry I meant capacitors
     
  8. R!f@@

    AAC Fanatic!

    Apr 2, 2009
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    You can increase capacitance provided they are rated for the proper voltage.
     
  9. artmaster547

    Thread Starter Member

    Jan 6, 2016
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    ok perfect thank you
     
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