CRD25DA12N as an off grid inverter

Andras_Magyar

Dear Experts,

We would like to use CRD25DA12N as an off-grid three phase power supply for railway applications and this module would be perfect for quick evaluation. The only problem is that we do not have code that can work in a closed loop system regulation for standard European three phase output 400Vac/50Hz.

So the requirements we need:

Vindc= 500Vdc

Vout=400Vac

Line frequency = 50 Hz

Poutmax = 8kW

Also we need the N neutral which we think can be the middle point between +/-DC input voltage. Is it right?

Could you please provide some help how to get this software for this module?

We have some TI resource for the control theory, link here (starting from page 32):

https://www.ti.com/lit/ug/tidue53i/tidue53i.pdf?ts=1739817665967&ref_url=https%253A%252F%252Fwww.ti.com%252Ftool%252FTIDA-01606

We do not want to get into the details because it can be complicated only that it would work autonomously regulation voltage, current or whatever best fit for the application.

Thanks and regards,

Andras Magyar

Forum_Moderator

Thank you for your post, it has been approved and we will respond as soon as possible.

TBhatia

Hello Andras,

CRD-25BDA6512N-K is optimized for Vin= 650V-900VDC and doesn't work very well below 650VDC input for 400Vac output voltage. However since your power is also limited 8kW, you can play around with the firmware to optimize it for those conditions.

You can also use our https://www.wolfspeed.com/tools-and-support/power/speedfit/ to choose the correct devices for your system conditions and topology.

If you need a neutral connection, you can use the connection below to connect a neutral wire. However the design and firmware have not been tested with a neutral connection.

Have you filled out firmware request for on this page?

https://www.wolfspeed.com/products/power/reference-designs/crd-25bda6512n-k/

Andras_Magyar

Hi,

Yes I have filled out the request for the firmware but I have not got it yet.

Can you provide it?

Thanks,

Andras