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Original question:

CCS/MSP430G2553: MSP430G2553

CCS/MSP430G2553: MSP low-power microcontroller forum

MAYURI KARVANDE
Prodigy 100 points
Part Number: MSP430G2553


Tool/software: Code Composer Studio

I am using Closed Loop Analysis along with PI on MSP430G2553 to get constant output from the buck-boost converter. I need a constant 12V output. The code is working fine except for the input range 11.5V to 16V, where it gives an output which is continuously boosting till 17V. Please help me to figure out this issue.

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    TI__Genius 17960 points

    Hi,

    many thanks for approaching us on support and your interest in MSP430.

    1. The number one requirement for enabling us to support you in solving a problem, is delivering sufficient information, to work on this. Your original post is just a high level information on the topic you're working on and struggling with, but there isn't any information, which could be a base for any investigations on our side.

    2. This is an MSP430 technical support forum. This means we're happy to support anybody in solving MSP430 related problems. But this means you need to boil down your problem to MSP430. From you're rudimentary description it sounds you're having trouble with the stability of your closed loop algorithm. Now as stated, we'll be happy supporting you on MSP430, if you'll find out it is due to limitations of our device, compiler, or something else originating from TI.

    My recommendation would be to debug the behavior of the algorithm you have implemented, to trace down the real root cause. If you see a stability issue at some ranges, it might be a problem with your calculations on the MSP430, running e.g. into overflows of some variables, but it might also be related to the HW of your control loop, or architecture of your control loop as such. Have you analyzed the stability of your control loop and have a positive result on that? Are you meeting all the stability criteria of your control loop with your implementation on the MSP430? Speed, parameters... Just a few checks, which you need perform on your side first.

    Best regards

    Peter

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