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dc/dc converter

fanis13fanis13 Posts: 8
edited 2005-04-29 08:29 in General Discussion
Hello my friends

i would like to build or to buy a converter dc/dc with Vin 2-10 volts and Vout 12-24volts and if its possible with p=200-500watt

if someone knows how this can be build or a site to sell it please tell me
thank you

Comments

  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2005-04-27 14:20
    fanis,

    ·· Many distributors, such as Jameco and Digikey carry these devices.· Check out their web sites.

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    Chris Savage
    Parallax Tech Support
    csavage@parallax.com
  • fanis13fanis13 Posts: 8
    edited 2005-04-27 14:53
    thanks for your reply,whats their site?i have send them an email
    i have try very much on the internet but is very difficult to find something like that,and at the stores here noone knows how to build it
  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2005-04-27 14:57
    www.jameco.com

    www.digikey.com



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    Chris Savage
    Parallax Tech Support
    csavage@parallax.com
  • pjvpjv Posts: 1,903
    edited 2005-04-27 17:09
    Seems to me that 500 watts out with 2 volts in implies an input current of 250 amps if effieciency is 100%.
    An animal with such low input voltage could at best be 25 to 50 efficient, so we may be looking at switching 1000 amps??????

    Good luck! I think you need to rethink your requirements to be somewhat more realistic.

    Peter (pjv)
  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2005-04-27 18:10
    pjv,

    ·· Thanks for catching that, I was thinking mW, not W!· That is going to be a fun thing to do.· To that end, I don't believe Jameco OR Digikey are going to have something like that.




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    Chris Savage
    Parallax Tech Support
    csavage@parallax.com
  • Paul BakerPaul Baker Posts: 6,351
    edited 2005-04-27 18:20
    Nope I checked, max power is on the order of a few watts, this supply would definitely be catagorized as an esoteric supply and would likely require a custom solution (something I wouldn't even consider trying). Also the broad range of all parameters specified puzzles me, are you looking for a generic supply? Do you have a particular application in mind? Perhaps if you elaborate what your trying to do, we can help you find an alternate solution.
  • fanis13fanis13 Posts: 8
    edited 2005-04-27 20:51
    ok guys you are right,forget about 200-500w
    if you know how to build or to buy a dc/dc converter with Vin2-10 and Vout 12-24 volts·just that,if you dont understand something please ask me again
    thanks
  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2005-04-27 21:17
    ·· I already posted sources for them...I just checked those source and they do in fact have them.· They just didn't do the 200-500Watt range...Did you check them out?

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    Chris Savage
    Parallax Tech Support
    csavage@parallax.com
  • fanis13fanis13 Posts: 8
    edited 2005-04-27 21:22
    Chris,unfortunately i still cant find any info, both 2 sites that you suggest me dont have this that i am looking for
  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2005-04-27 21:32
    ·· Well, there are 1,944 DC/DC converters on Digikey alone...If you need one that can handle 10V in and put out 12V as an example, there are plenty.· However, if you need one that does your exact range, then you will probably have to build it yourself.

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    Chris Savage
    Parallax Tech Support
    csavage@parallax.com
  • fanis13fanis13 Posts: 8
    edited 2005-04-27 21:46
    yes you are right,there isnt any site that sells that,about 1 month i try every day and i havent find anything,do you have any suggestions how to build it?or a site that helps you,if you have·any idea please tell me

    thanks
  • pjvpjv Posts: 1,903
    edited 2005-04-27 22:27
    Fanis;

    It is very difficult to give help or advice when you are just keeping us guessing.

    As stated several posts above, please tell us in some detail what you are trying to accomplish so that we can assist you, otherwise I for one, and I presume others as well, will not be interested in responding to your pleas for help.

    Peter (pjv)
  • fanis13fanis13 Posts: 8
    edited 2005-04-27 22:47
    pjv said...
    Fanis;

    It is very difficult to give help or advice when you are just keeping us guessing.

    As stated several posts above, please tell us in some detail what you are trying to accomplish so that we can assist you, otherwise I for one, and I presume others as well, will not be interested in responding to your pleas for help.

    Peter (pjv)


    peter its a homework for my scool,to success his class i just have to build or to buy this converter,just that
  • Paul BakerPaul Baker Posts: 6,351
    edited 2005-04-28 18:35
    Considering you will not be able to find a supply to provide the wide range of specifications you've listed, you're stuck creating your own. The most straightforward method is through an inverter configuration, its an unwieldy solution, but rolling your own commercial grade DC/DC supply will be over your head (it's over mine as well). Basically you want to create an oscillator, use the output to drive a power mosfet which switches the supply voltage on and off through a step up transformer, the oscillator should have a frequency in the 100-500kHz region. On the secondary side of the transformer you perform AC to DC conversion using a full bridge rectifier and capacitor to get a DC voltage of at least 26V, then use an adjustable regulator to set the output voltage.

    This method is far from perfect, its physically large and its efficiency is poor. If you don't understand the explanation above, I don't have much more room to explain further, this is not a simple project and to discuss all of the factors involved would fill a small book.
  • pjvpjv Posts: 1,903
    edited 2005-04-29 01:28
    Paul, perhaps it would be a large book.....500 watts from 2 volts. Not impossible, but real tough, and real expensive. If someone asked me to design and build a commercial unit like that, I would charge not less than $100,000, because it would take a year to get it right.

    Peter (pjv)
  • paysonbadboypaysonbadboy Posts: 81
    edited 2005-04-29 05:53
    What size of WIRING and SOLDER traces would you need at 2VDC to provide 500 watts????


    I'm actually working in my own PWM power supply, as mentioned in another thread.
    But just MAYBE 100 watts from 12VDC.


    Paul. I'm pretty sure that a full wave rectifier would not be needed if only a single wound primary/secondary transformer was used as the output would always just be pulsed DC as well. So a single diode would work.

    If it's PUSH-PULL then there's a little more to it depending if it's dual ended (= and - potential to common) or just one voltage output.

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    http://www.paysonarizona.net/
  • fanis13fanis13 Posts: 8
    edited 2005-04-29 08:26
    pjv said...
    Paul, perhaps it would be a large book.....500 watts from 2 volts. Not impossible, but real tough, and real expensive. If someone asked me to design and build a commercial unit like that, I would charge not less than $100,000, because it would take a year to get it right.

    Peter (pjv)
    Peter please forget the power of 500 watt as i have mention above
  • fanis13fanis13 Posts: 8
    edited 2005-04-29 08:29
    paysonbadboy·and Paul thanks for yor thoughts, i study them and i will mention any question i will have
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