Separate the ground of a 3-Phase Back-to-Back Inverter Research Board converter

[rabiskar]

I am working out a 1 phase Multilevel Cascaded converter using a 3-Phase Back-to-Back Inverter Research Board converter. But I cannot use a single board to design this. Because both the inverter on board has common ground. So is there any way I can separate both the converters ground. 

This is very important to me. The alternative is I have to use two separate board to design this which is a lot more cost. So I am definitely looking for a positive answer. 

Thank you in advance. 

[eltico]

Hi rabiskar,

I would try using multi-layer board even though it's the same principle of having 2 or more boards.

https://knowledge.ni.com/KnowledgeArticleDetails?id=kA00Z0000019PxySAE

Maybe you can use both sides of the PCB but I'm not sure if that will generate a design error.

Regards,

PedroR

[rabiskar]

Hi PedroR,

Thanks for the reply. 

I could not understand what do you mean by "both sides of the PCB" and what is a multi layer board?

Regards,

Rabi

[eltico]

You're welcome. A multi-layer board is manufactured by placing isolation in between the layer pairs then gluing them together. That's why I say it's similar to having several PCBs. 

With "both sides" I mean placing the cooper on top and bottom but I couldn't assure this idea makes sense. It might be better to go to someone with PCB designing experience.

Regards,

PedroR 

[rabiskar]

Hi PedroR,

Thank you for your explanation. 

But according to your explanation, I have to design a new board and order it from the NI. But my requirement was to use the existing 3-Phase Back-to-Back Inverter Research Board by NI to design a cascaded inverter. 

[eltico]

Hi rabiskar,

You're welcome. I'm afraid I don't understand what do you mean by order it from NI. Could you explain further, please?

[rabiskar]

3-Phase Back-to-Back Inverter Research Board is a GPIC board manufactured by the National Instruments for research purpose. If you go through the link below you can understand the difference. 

http://www.ni.com/example/14395/en/

We generate the switching sequence, do the necessary connections based on the design and design the output filter for the circuit. 

[eltico · Accepted solution]

I understand and I'm afraid that NI does not fabricate PCBs, the design there is for you to open with Ultiboard, modify it according to your requirements and contact a PCB manufacturer with the design generated by Ultiboard.

Because the example does not address using 2 inverters on the same board, it's complicated to understand if it's possible or not and it might be better to get in touch with someone that specializes in developing boards. 

[rabiskar]

Thanks for your reply. 

I dont know any right person whom should I contact to resolve this issue. It has been nearly a month since I am trying to solve this problem. 

If you have any appropriate contact person who can help me in this please let me know. 

[eltico]

You are welcome. I'm not sure if this is the right place for asking that. I would suggest taking a look at companies around your area that works with PCB designing.