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How does the Xenon Flash in Lumia; or, if fact any compact device work

  1. May 13, 2013 #1
    I don't need basics, I know the causes how xenon flash "works" ; I need to know how do they minimise this kind of circuit in microprocessor?
    camera-flash-diagram.gif
    My question: The Flash tubes require kVs of potential difference to work. I am aware that big capacitors are required to make them work. This is okay upto digital cameras where they can put big capacitors.
    But cell phones? I read somewhere that microprocessors can't have big capacitors. So how come they work?
     
  2. jcsd
  3. May 13, 2013 #2

    Borek

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    Staff: Mentor

    Why do you think the capacitor is part of a micropocessor? It can be a standard capacitor, mounted separately.
     
  4. May 13, 2013 #3
    I mean to ask if there is some other work around. Putting massive capacitor in a cell phone is nearly impossible.
     
  5. May 13, 2013 #4

    jim hardy

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    Science Advisor
    Gold Member
    2016 Award

    here's some reading for you

    http://www.osram-os.com/osram_os/en...ry/2012/osram-oslux/index.jsp?mkturl=pr-OSLUX



    http://www.xenon-technologies.com/userfiles/files/XEN003066YC_ProductCat_05oct10.pdf [Broken]

    http://powerelectronics.com/mobile/supercaps-lighten-load-led-flash-applications


    these two describe cellphone xenon lamp drivers
    http://cds.linear.com/docs/en/application-note/an98f.pdf
    http://cds.linear.com/docs/en/application-note/an95f.pdf

    Take a dead one apart and see how they did it.. you can become the expert !
     
    Last edited by a moderator: May 6, 2017
  6. May 13, 2013 #5

    Borek

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    Staff: Mentor

    From what I have seen capacitors in these devices are surprisingly small. Last year I have replaced the shutter button in my idiot camera, and from what I remember whole flash module was small enough to fit in my mobile - granted, my mobile is not the Lumia, but also the flash module was not designed to be slim.
     
  7. May 13, 2013 #6
    Most cell phones I have seen use LEDs.
     
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