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CCS/TIDM-HV-1PH-DCAC: Real time control

Justin Walraven1
Prodigy 45 points
Part Number: TIDM-HV-1PH-DCAC

Tool/software: Code Composer Studio

Hi Everyone!

Yay!  First time posting from my company account :-).

I'm looking at the TIDM-HV-1PH-DCAC, and I'm hoping that someone can answer a few questions, mostly having to do with the Sigma Delta ADCs.

1) It looks like there's an inductor current sensor and voltage sensing that goes directly to the DSP on board ADCs, and the code indicates that either the on board SAR ADCs or the SD ADCs could be used for real time control, but only the SAR ADCs seem to be activated.  Is the real-time control of inductor current and output voltage done with the SAR ADCs or SD ADCs or is it selectable or is a combination used?

2) Inductor current is sensed indirectly with the SD ADCs by adding the output current and the capacitor current- is there a reason why the inductor current wasn't sensed directly?

3) It appears that the oversample rate is 32, and that the filter is SINC3.  Is this correct? The clock pins are hooked up to GPIO4, which doesn't appear to be an SDFM clock pin.  How are the SD ADCs clocked?

I'm excited to be back on E2E!

Best,

Justin

  • 0
    TI__Mastermind 43730 points

    Justin,

    1. It is a selectable option, see Fig 19. For VSI you can use either or (ADC or SDFM), For GCI you can only use SDFM. 

    2. We wanted to provide all the options, so customers can play with a variety of control. We also provide an option to sense the cap voltage (hidden in the schematic). Simply put for VSI we designed a current control based on inductor current, for GCI we wanted to design based on the output grid current. Also measuring output current we can do better power measurement. In summary, we tried to provide different options.

    3. Please see UG 2.2.2.2.4 SDFM Clock Generation

     

  • 0 in reply to Manish Bhardwaj
    Prodigy 45 points

    Thanks Manish!  I'll have to buy you a lunch at APEC next year :-(.

    Justin