High current linear voltage regulator

Discussion in 'The Projects Forum' started by onlyvinod56, Mar 10, 2011.

  1. onlyvinod56

    Thread Starter Active Member

    Oct 14, 2008
    362
    1
    Hello,

    I want some help in designing a high current linear voltage regulator.
    Requirements are

    1. Input voltage may vary from 35 to 50V DC.
    2. Output voltage should be 30V DC.
    3. The current rating is 30A.
    4. It should be a linear power supply.(not a switched mode)
     
  2. ifixit

    Distinguished Member

    Nov 20, 2008
    639
    108
    Hi onlyvinod56.

    The series regulator transistors will have to dissipate alot of power under the worst case situation. If that is 50V in and 30V out at 30A then the power is (50-30)*30A=500W. However, if the input drops linearly from 50 to 35V as the load goes from 0 to 30A then the worst case is only 200W. Is this the case?

    What power transistor resources do you have?

    Does the 35V include ripple voltage?

    How accurate does the regulation have to be?

    You need big heatsinks. Can you use fans for forced-air cooling?

    Regards,
    Ifixit
     
  3. wayneh

    Expert

    Sep 9, 2010
    12,145
    3,055
    Since that's the leading technology these days, I think it's fair to ask why you've made that decision.
     
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