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TIDA-01606: about sfra question?

Gavin Chen
Prodigy 50 points

Part Number: TIDA-01606
Other Parts Discussed in Thread: SFRA,

Tool/software:

Hi
Ask some questions about SFRA.
Follow TIDA-01606_userGuide to do Lab6 experiments
The hardware installation is approximately as follows:
Chroma Regenerative Grid Simulator(61815) AC source -> tida-01606 -> chrome Bidirectional DC power Supply(62180D-1200) DC Load

1. tida-01606 -> The load is set to 3.18K resistor
2. AC source +30Vrms -> tida-01606
3. TINV_allRelaySet -> 1
4. TINV_allRelaySet -> -0.013
5. TINV_startPowerStage -> 1
6. AC source change to 180Vrms(or 220Vrms) -> tida-01606

Test SFRA.
Question 1. Why are the results of each test different? There is a huge difference?
Like the picture below, will there be a peak close to 120dB? What does this mean? Can you explain it to me?
Because in other graphs it is downward close to 120dB?

Question 2: When working on Compensation Designer, there will be a red dot in the graph. What does it mean? Should its position be close to 0dB? Because sometimes the red dot cannot be seen?
Sorry to trouble you, thank you

  • 0
    TI__Expert 7855 points

    Gavin,

    The red dot is the location of the zero fz0.  It affects your compensation response.  the red dot should move when you edit the fz0 in the compensation designer gui.

    -Kelvin

  • 0
    TI__Expert 7855 points

    Gavin,

    I haven't tested the SFRA myself so i'm not sure about that tool.  In the future, i think this feature will not be supported in the SDK.

    About the repeatability part,  if were you i would make sure to perform the test at a stable working condition.  Based on your compensation designer, there is a weird spike close to 400Hz.  try to get your system to a a nice phase response in the passband.  you should try to reduce your Folg_cf frequency to increase stability.

  • 0 in reply to Kelvin Le THS
    Prodigy 50 points

    Hi,
    Okay, I will try again based on your suggestion.
    Also, I would like to ask, if the SDK does not support SFRA in the future, are there other methods or tools to adjust the Kp/Ki value?
    BR,
    Gavin