1.2 volts to 1.7v 80 amp help

Discussion in 'The Projects Forum' started by buddylove1986, Jan 24, 2016.

  1. buddylove1986

    Thread Starter New Member

    Jan 17, 2013
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    Hi all i need some help i have a gridseed g blade that the power board failed it use 3 mosfets that take 12v 5 amps to feed 1.2 to 1.7 v at 80/90 amp to the chips and 5v to the usb chips is there any way to make a power board that can tack 12v and make 1.2v at 80 amp looked on google and cant find any thing that put out low volts and high amps need some help.
     
  2. Papabravo

    Expert

    Feb 24, 2006
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    Easiest thing to do is score a replacement from the original manufacturer. I must confess I have NFI what a "gridseed g blade" is. To design such a power supply at those power levels will require careful analysis and layout with particular attention to conductor cross section and current handling capability. Inductor core materials may also be problematic to avoid saturation.
     
  3. Bordodynov

    Active Member

    May 20, 2015
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    You are probably trying to get energy from the vacuum. 1.2V*80A=96W and 12V*5A=60W.
     
  4. Kermit2

    AAC Fanatic!

    Feb 5, 2010
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    What you circuit probably did was feed pulses of 12 volt power to your glow plug and use approximately a 10% duty cycle to achieve the same heating effect as a 1.2 volt battery would produce.

    That can be easily done.
     
  5. buddylove1986

    Thread Starter New Member

    Jan 17, 2013
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  6. buddylove1986

    Thread Starter New Member

    Jan 17, 2013
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    this is the board i am trying to power.
     
  7. ronv

    AAC Fanatic!

    Nov 12, 2008
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    That doesn't look like a board that needs 80 amps. What is the part number of the IC's (the ones with 8 in a row)
     
  8. buddylove1986

    Thread Starter New Member

    Jan 17, 2013
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    the chip say GC3355 GridSeed
     
  9. bertus

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    Apr 5, 2008
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  10. ronv

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  11. buddylove1986

    Thread Starter New Member

    Jan 17, 2013
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    see i read a forum https://bitcointalk.org/index.php?topic=576784.420 form a guy J4bberwock he show how he power a bad broad with the small GridSeed pod 5 chip ver that you can still the 5v and 1.2 volts later in the post he say he made a external power supply to freed one but it a old post and he never sad how he made one in one of his post he sad that you need 1.2v at around 80 amps.
     
  12. ronv

    AAC Fanatic!

    Nov 12, 2008
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    Hmm, don't know what to tell you about that.
    Let me ask one more question:
    Is that the power connector coming into the board. The connector next to the usb socket.
    If so, it probably comes from a "wall wort" power supply. What is the voltage and current printed on it?
     
  13. ISB123

    Well-Known Member

    May 21, 2014
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    I doubt that that thing needs 80A my welder uses that much...And those LDO's can only handle 600mA.
     
  14. Papabravo

    Expert

    Feb 24, 2006
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    Glad I didn't try to design an SMPS with an 80A output. Someone would probably 'shoot there eye out'.
     
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  15. buddylove1986

    Thread Starter New Member

    Jan 17, 2013
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    i found this over at the other site might help how would i make this on a bread board
     
  16. ronv

    AAC Fanatic!

    Nov 12, 2008
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    Hmmm, I don't know. I don't see anything like that in your picture of the board. Where would you hook it when you built it?
     
  17. BramLabs

    Member

    Nov 21, 2013
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    Sorry if i'm out of the topic.
    Sir papabravo, do you have any link or website for learning SMPS design for beginner ?
    Thanks sir !
     
  18. Papabravo

    Expert

    Feb 24, 2006
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    Information on the web keeps changing all the time and it is hard to keep track of new stuff. Try this to see if you can follow what is going on. You need to be intimately familiar with inductors, capacitors and diodes. Review those components if necessary.

    http://www.smpstech.com/tutorial/t00con.htm
     
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  19. BramLabs

    Member

    Nov 21, 2013
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    Thank you sir for your information. I've learned how to calculate buck and boost or buck-boost converter in simple circuit when i was in college. But i think in reality, it's more complicated than in textbook.
    Thank you so much for the link !
     
  20. Papabravo

    Expert

    Feb 24, 2006
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    Once you get the basic idea it then becomes a problem of component selection and fabrication, particularly when it comes to inductors.
     
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