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2P2Z constants

Other Parts Discussed in Thread: CONTROLSUITE

Dear All,

    In most of the C2000 sample programs for power or development boards, 2P2Z is used for

controlling. But no data was found about how to calculate those constants.

    Kindly provide some example with detail explanation for how to calculate those constants.

and what is advantage of 2P2Z over PID loop ?

Thank You

  • Dear Bhuvaneshwar,

    You may find some information in the documentation which accompanies each kit in controlSUITE.  Quite often with these kits the 2P2Z control structure is used to emulate PID control.  I have attached a file which explains one way in which the 2P2Z coefficients can be calculated from P I & D gains.

     1411.Discrete PID controller.pdf

    You can find information about emulation design methods in many places.  For example, this website has links to documents and videos which may be helpful (See particularly the video for "Part 4"):

    https://sites.google.com/site/controltheoryseminars/

    Also, there is a coefficient calculator for digital power supplies at the Biricha website which you may find useful:

    http://www.biricha.com/resources

    For transient tuning the 2P2Z offers little or no advantage over a well designed PID.  Features such as integrator anti-windup reset and set-point weighting, which are commonly found in discrete PID controllers, are impossible to represent as a set of poles & zeros.  

    The 2P2Z is best suited to phase compensation, where pole & zero frequencies must be adjusted to meet specifications on the open loop frequency response. This is its major use in power supplies.

    I hope this helps.

    Best regards,

    Richard

  • Hi Richard,

          Thank you for solving my question.

    It will be really useful.

    Thank You

    Bhuvaneshwar Kanade