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TIDA-01606: PCB rev6 test with lower Vin?

AnBer
Mastermind 30375 points
Part Number: TIDA-01606


Team,

Customer is testing TIDA-01606 PCB rev 6 using the TMDSCNCD28379D and latest Digital Power SDK 5.00.01.00.

I have made some measurements with LAB7 test mode and the results as below,

  1. We have started initially with 60VAC3 (Line to Neutral Voltage)and output DC voltage reference set to 500VDC.
    The voltage and current are in sync. But the iGridRms (~3A) currents displayed in CCS debug window and our measurement (6Arms) doesn’t match. There is almost a factor of 2.

     

2. We slowly increased the AC input voltage to 230VAC3 (L-N) and Output DC Voltage to 700VDC and the output power to around 1.7kW (Comparable to tidue53i userguide, Figure 3-9). Check the pictures on the left measured at Stercom and on the right reference measurement from user guide.

All the tests were performed with default regulator parameters as in LAB7 exercise and Electronic Load from Delta Elektronika (15kW) was used for the tests.

 From the schematic, the shunt resistors (R5, R41 & 47) used for iGridRms sensing are 2mohm type. Check if this was changed or any changes needed in code for AMC1306 (Delta-Sigma) scaling factor?

 In addition, please let us know if the additional LEM current sensors (CASR-15-NP) U3, U4 and U5 are used for regulation or measurement?

Thanks in advance,

A.

  • 0
    TI__Expert 3270 points

    Hi Anthony,

    following you find my answers:

    1) I need to check in the lab this feature. Tomorrow, i will give a look to this.

    2) is the customer having the neutral connection to the middle point? which control card is using? In general, to me looks that the kp and ki are not enough (of course in case that neutral is not there). I suggest the customer to increase the kp of 40 %.

    3) yes, we need 2 moHm and it is fine the scaling. no software change required.

    4) LEM are not required for controlling the current, also because one of the LEM signal it is subjected to noise. Please use the SDFM.

    Thanks

    Best Regards

    Riccardo

  • 0 in reply to Riccardo Ruffo
    Prodigy 10 points

    Hi Riccardo,

    Thanks for your reply.

    Regarding 2) We have the neutral connected to the middle point. We can increase the kp and ki for the current controller but prior to that, we wanted to be sure the measured current is same what is displayed in the GUI referring to point 1.

    Check and Let us know.

    Thanks in advance

    Regards,

    Sujay