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TMS320F28335: Solar lib SOGI PLL lock detect

KJ
Prodigy 60 points

Part Number: TMS320F28335
Other Parts Discussed in Thread: C2000WARE

Dear All,
like in the thread title - is there a reliable way to determine if the PLL is locked, basing on the output signals from the SOGI 1-ph SPLL instance?

Thanks in advance for any help,
jako

  • 0
    TI__Mastermind 43730 points
    I am not sure what you mean by

    "determine if the PLL is locked, basing on the output signals from the SOGI 1-ph SPLL instance"

    typically when PLL is locked the error is going to be low "spll_obj->ylf[0];"

    however, this is the case when the center frequency is close to what the actual signal you are trying to latch on.

    Any frequency variation, will also cause this error to rise, and if it is different than the center frequency it will stay high..

    you can also look at the frequency locked loop implementtaion inside the digital power sdk, which adjusts the ceneter frequency as well and in that case this errir is true PLL lock error

    C:\ti\c2000\C2000Ware_DigitalPower_SDK_1_00_01_00\libraries\spll