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3v 50A diode laser power supply

Discussion in 'Electronic Design' started by recoder, Oct 24, 2007.

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  1. recoder

    recoder Guest

    Dear All,
    As a part of a project I need to design a 3v (or 4V) 50A power
    supply. This power supply will be part of a diode laser. Can Anybody
    help me out. Any references?
    Thanks in Advance
     
  2. colin

    colin Guest

    a PC power supply can probably handle that.

    Colin =^.^=
     
  3. Guest

    dear
    you can make it by using +3 ...0..-3 transformer .thenfull wav
    rectifier (four 4n001 diode and then 7903 (regulator ic))total cost
    will not exeed 50 r.s. if you need i will send you ckt it will work
     
  4. SEE:

    Review of Scientific Instruments
    Volume 69, number 6 June 1998
    Saam and Conradi

    "Protection Circuitry for High Power Diode Arrays"

    Also SEE:

    Scientific Instrument s
    Volume 74 Number 8 August 2008

    "Laser diode current controller with a high level of protection
    against electromagnetic interference"
    Josef Lazar, Petr Jedlicka, Ondrej C p, and Bohdan Ruzicka


    You need a 50 amp constant current source, not just a power supply,
    that supply must start up softly with no overshoot in current or
    voltage and no spiking, or you will destroy the diode(s).
    The above two journal articles give basic large diode protection
    schemes.


    Steve Roberts
     
  5. No, it will not...

    The OP could check out the application notes for the low voltage
    synchronous polyphase / multiphase buck regulators (as used in
    on-board supplies on PC motherboards).
     
  6. It's more like a 50mA power supply.

    Best regards,
    Spehro Pefhany
     
  7. Well I did think it might be a typo! But it is repeated in the title
    and the body of the post, so I decided to take the OP at his word.
     
  8. Guest

    4001 diodes handling 50A -hehe
    dear- oh dear..
     
  9. default

    default Guest

    That sounds like a lot of amps for a diode. This a water cooled IR
    cutting laser, or do you just need a 50 amp short duration pulse?
     
  10. Jamie

    Jamie Guest

    Humm, how big is this laser unit?
    I mean, that's almost enough power to etch :)
    are you sure it isn't more like 50 ma's ?
     
  11. SNIPPED. Oprah this, money that, Telly this, Loot that.

    Bloody loony.
     

  12. Sure it will. Likely have huge ripple as well.
     
  13. Guest

    Will the spam never stop?
    Does anybody realize that 4000 series diodes handle 1 amp and a 7903 -
    if they exist- handle 1.5 amps negative voltage..sheesh..why am I even
    staying up this late to put this bullshit up when I could be
    sleeping,,I dont know,,
    Bye yall now..
     
  14. Fred Bloggs

    Fred Bloggs Guest

    It's just numbers. It's like we have numbers arsing from the
    requirement, probably in some arbitrary and clueless way, then we have
    stock components with their numbers. So all you have to do is match them
    all up and find a diarrhea-gram showing how to "hook" it all up. The
    project is finished when a half-assed bench check convinces the confused
    that the circuit is "doing what it's s'posed to do"- I really luv that
    one, it sort of imparts a Biblical discipline to the process,"doing what
    it's s'posed to do"- a person can get drunk on self-satisfaction with
    making it all come together like that.
     

  15. So, brainiac... tell us why MOBO makers all use switchers for low
    level logic voltages, such as 3.3V, when all they need is your
    transformer/full wave bridge/regulator solution?

    I'll tell you why, dipshit... RIPPLE!

    And in case you were drunk or half asleep when you chimed in with your
    bullshit, the OP is looking for 50AMPS, idiot!
     

  16. Just so you know, I thought you were the dolt that suggested the
    transformer solution.

    Calling my reply spam does make you a retarded **** asshole, though, if
    that is what you were doing.
     
  17. Guest

    This is a typical supply requirement for the pump laser diode for a
    yag laser, or the diode used in a platemaker, hes looking at maybe 20
    watts of laser output if its a pump diode or about 60 watts of direct
    diode output, those numbers may be slightly optimistic. Solid state
    diode laser arrays of 500 watts output power are not unheard of these
    days, so.... 50 mA is more typical of a laser pointer, but yes, he's
    asking to pump a large array of diode chips.

    Steve Roberts
     
  18. recoder

    recoder Guest

    Dear All,
    It is really 50Amps. Now I understand that what I need is a current
    controller.Thanks to you all . I want to take a look to the article
    below but no luck. I cannot download it. "Laser diode current
    controller with a high level of protection against electromagnetic
    interference" Do you have other references to download?
    Thans to you all...
     
  19. Jamie

    Jamie Guest

    well ok, that makes much more sense.
    it would of lesson the confusion if the poster would
    of indicated the used of diode arrays.
     
  20. Jamie

    Jamie Guest

    Ok, now that you have cleared that up.

    I don't know where your expertise lye, so i'll
    point you here to start with:

    http://www.zen22142.zen.co.uk/Circuits/Power/add-on.html
    That is a very basic current limiter add on to an existing
    supply.
    After looking at that for a bit, you could then start with
    something like a basic computer switching power supply that has a
    5 volt output as the base input to a current regulator.
    by using large wattage and low value current sense resistors
    along with high current transistors, you'll have your current
    limiter.
    Using the URL as a reference, if you need to pulse this
    signal. Just look at R1.
    There are better and tighter methods of current regulation
    how ever. The use of an op-amp via the (+) and (-) inputs shunted
    with a current sense resistor will give you an extremely sharp
    current response to fold back the voltage on the driving circuit.

    Something to think about.
     
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