controller design for two crossover frequencies

Discussion in 'The Projects Forum' started by suzuki, Oct 27, 2011.

  1. suzuki

    Thread Starter Member

    Aug 10, 2011
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    0
    Hi,

    *This is related to control theory /control loop design.*

    Does anybody know of a resource where I can learn to design controllers with 2 crossover frequencies? Most of the textbooks i have read have design process for a single crossover frequencies. I am having some difficulty getting adequate phase margin and gain margin.

    thanks.
     
  2. crutschow

    Expert

    Mar 14, 2008
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    What type of system are you trying to stabilize?
     
  3. suzuki

    Thread Starter Member

    Aug 10, 2011
    119
    0
    not sure if this answers your question but, it is a voltage control loop for output voltage regulation of a power electronics converter. I am trying to determine a compensator that will give me suitable gain and phase margin. the loop is not yet "closed", so the equation is in the form Y = C*P*H (compensator, plant, feedback gain)
     
  4. crutschow

    Expert

    Mar 14, 2008
    12,972
    3,219
    Here's a good reference that should help you design a stable feedback loop for a power converter.

    Edit: I used the design info in that reference to successfully design a 5V, 1A buck converter.
    I would highly recommend that you simulate your control loop before you build it.
     
    Last edited: Oct 28, 2011
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