Speedfit Design simulator (sixpack module)

mavern1

Hi

We are simulating "3-Phase Interleaved Buck-Boost Converter (Buck Mode)"

The part chosen for this design is CCB021M12FM3, 30A per leg phase current module. So by design we can go upto 36000W total power (400V x 30A x 3 ). SW freq is very low for sim @ 20Khz.

However when we try simulating we can do only up to 19000W , if we go higher say 20000W as shown below the tool is requesting for two devices in parallel as apposed to a single part ?

Is this a simulation limitation that is getting kicked in here or some device specific ?

Forum_Moderator

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

BlakeNelson

Hi mavern1,

I reviewed the simulation in question and discovered that the formula calculating device current was not correctly accounting for the reduction in current from the three phase arrangement. Basically, it was calculating that the device current was three times higher than reality for the purpose of component selection.

I'm working with our team to get SpeedFit updated as soon as possible and hope to get back to you this week.

Thanks for your comment!

Blake

BlakeNelson

Hi mavern1,

The issue should now be resolved. Please don't hesitate to reach out if you run into any other issues with your simulation on SpeedFit.

Thanks,

Blake

BlakeNelson

I hope that this answered your question. I will close this discussion for now but if you have a follow up question, please "Start a New Discussion" and we would be glad to support you further.

Blake