topic Problem with 3p3z control equation in CM4PCLIBUG in Kinetis Microcontrollers

Problem with 3p3z control equation in CM4PCLIBUG

D4Worker — Thu, 30 Sep 2021 03:06:08 GMT

Hi there,

In my digital power control application, I worked out the 3p3z transfer function control equation from somewhere (simulator) and initialized the controller with the statement PCLIB_Ctrl3P3ZInit_F16_C.

However, the f16output is always 0 in each ISR PCLIB_Ctrl3P3Z_F16_C.

Is anyone here has experience using PCLIB_Ctrl3P3Z in PCLIB?
Any tricks on the delay parameters like f16DelayX1?

Many Thanks!

Re: Problem with 3p3z control equation in CM4PCLIBUG

D4Worker — Mon, 04 Oct 2021 04:00:03 GMT

I can finally make the output by adding the FRAC16() macro on the error calculation.
f16Err = FRAC16( target - now). It doesn't work without it.

However, any experience sharing on using the 3p3z lib is still very appreciated. thanks all

Re: Problem with 3p3z control equation in CM4PCLIBUG

EdwinHz — Mon, 04 Oct 2021 23:45:50 GMT

Hi @D4Worker,

Glad to hear you were able to make it work. For more information on how to use the PCLIB, make sure to check out the "PCLIB User's Guide". Here's the link: https://www.nxp.com/docs/en/user-guide/CM7PCLIBUG.pdf

Best Regards,

Edwin.

Re: Problem with 3p3z control equation in CM4PCLIBUG

D4Worker — Tue, 05 Oct 2021 06:17:19 GMT

Firstly, thanks for helping,
However, the problem is still unsolved.
For this 3p3z controller, there are "some but erroneous" outputs from the ISR statement PCLIB_Ctrl3P3Z_F16_C().
We are not sure if those B0123, A123 coefficients could have wrongly during the f16 conversion.
It looks there are no sample application using the 3p3z lib in lib package RTCESL_CM_Setup_4.6.3. which found in this link

https://www.nxp.com/products/processors-and-microcontrollers/arm-microcontrollers/general-purpose-mcus/kv-series-cortex-m4-m0-plus-m7/real-time-control-embedded-software-motor-control-and-power-conversion-libraries:RTCESL

any usage example would be appreciated.