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TMDSSOLARUINVKIT: Changed a setting and encountered an Issue

May
Genius 9880 points

Part Number: TMDSSOLARUINVKIT

Hi Team,

My customer run into a problem using the Texas Instruments Development Board TMDSSOLARUINVKIT and would like to seek for your assistance on this matter, please see details below.

We followed the steps in the user guide (https://www.ti.com/lit/ug/tidu405b/tidu405b.pdf?ts=1654046656762&ref_url=https%253A%252F%252Fwww.ti.com%252Ftool%252FTMDSSOLARUINVKIT)
And tried out the different Builds under chapter 6. Everything worked fine till BUILD = 3 (chapter 6.3.2). Since we live in Germany, we changed the GRID_FREQ to 50 in SolarMicroInv-Settings.h
and connected the inverter output to the 230V grid with a 200 Ohms resistor. The 200 Ohm load is also based on the suggestion in C2000 Solar Micro Inverter QSG.
Our setup is also shown in the following image.

When we turned on the inverter by setting Gui_InvStart to 1 (chapter 6.3.2.4 point 6) the fuse is blown. Also, the daughter card is not getting connected to the CCS as it was easily getting connected previously. Can someone guide us with a solution to the problem? Our connection and all other steps was based on the user guide and the related documents to Solar Micro Inverter kit.
Thanks.
Regards,
May

 

  • 0
    TI__Intellectual 790 points

    This is a very old h/w kit/EVM. It may take time to get the answer. But, I have asked the right expert to look into this.

  • 0
    TI__Genius 10995 points

    It seems like the instructions were given (UG) for 115V, 60Hz AC source. But with 230Vac, 50Hz AC input the DC bus was not high enough to drive current into the load. The current flowed in the reverse direction into the DC bus and damaged the h/w and blew the fuse. Also, you MCU control card is damaged since it is not connecting to CCS.

    You will need to check the control card (CC) separately using other h/w such as docking station. If it is good then use build 1 and then build 2 to test the flyback and the inverter stages separately. If CC is bad then you will need to use a new CC. 

    Worst care you will need the replace the complete h/w.

    This is an very old kit. I would suggest next time you use a grid simulator instead of direct grid connection. 

    Shamim