Dummy load in dc dc converters

Discussion in 'General Electronics Chat' started by balamanikandan, May 15, 2012.

  1. balamanikandan

    Thread Starter New Member

    May 15, 2012
    8
    0
    hi,


    Requirement :

    It is necessary for a power supply to retain its normal regulated output voltage in the presence of reverse current flow during part of the operating cycle of an active load device connected to the power supply.

    a. Will connecting dummy load in shunt meet the requirement if the buck converter is designed using BJT transistor ?


    b. Will connecting dummy load in shunt meet the requirement if the buck converter is designed using MOSFET transistors (Synchronous and Non isolated converter) ?​
     
  2. R!f@@

    AAC Fanatic!

    Apr 2, 2009
    8,754
    760
    Are u planning to build a SMPS or what.

    Dummy load or what ever, Ur post makes no sense.
     
  3. t06afre

    AAC Fanatic!

    May 11, 2009
    5,939
    1,222
    This looks look an school assignment. We do not mind helping students in this forum. but do not expect a solution served on a silver plate. Your explanation do not give much room for helping out. You must provide much more details I am afraid. Start with what you have done so far, and why and how you struggle.
     
  4. crutschow

    Expert

    Mar 14, 2008
    13,056
    3,245
    Whether the converter uses BJTs or MOSFETs makes little difference for your problem.

    A dummy load is one way to handle the problem, but that would waste power when you don't have to sink current.

    A more efficient way would be to add a shunt regulator using a power transistor with voltage set to be slightly higher than the normal output voltage. Then when the output voltage rises due to voltage from the load it will sink the excess current but will have no effect otherwise.
     
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