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Original question:

Question about the 2p2z controlle coefficient

CCS: The position of zero and pole in 2P2Z

user6334344
Prodigy 30 points

Tool/software: Code Composer Studio

According to the relevant formula of 2P2Z, we know that there is one zero and two poles, but why is there 2 zeros and one pole in 2P2Z in C2000 Compensation Designer GUI?
If I now know the values of the parameters b0, b1, b2, a1, a2, is there any tool that can directly find the position of the zero and pole? Or is there any relevant document that can calculate the zero and pole positions? (Or documents about 2P2Z compensation design)

  • 0
    TI__Genius 12025 points

    According to the relevant formula of 2P2Z, we know that there is one zero and two poles, but why is there 2 zeros and one pole in 2P2Z in C2000 Compensation Designer GUI?

    No, it is not one zero two poles. A 2P2Z has  two zero and two poles.

    In almost all cases one of the poles is fixed at 0Hz. This is the integrator pole. The two zeros and the second pole are placed appropriately to shape the Bode plot for good BW, PM and GM.

    ------------------------------------------------------------

    If I now know the values of the parameters b0, b1, b2, a1, a2, is there any tool that can directly find the position of the zero and pole? Or is there any relevant document that can calculate the zero and pole positions? (Or documents about 2P2Z compensation design).


    This information is in public domain. You can research any digital control book or publication for this. We don't have any document on this.