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Hello!
I am very interested in the 60KWDAB.The official website describes the CRD60DD12N-GMB as follows: Through careful design, sufficient power transfer is achieved using only the leakage inductance of the high-frequency transformer, eliminating the need for bulky additional magnetic components. How is this achieved? Are there any limitations to the switching frequency of this design? Is it suitable for operation below 10kHz?
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Thank you for your post, it has been approved and we will respond as soon as possible.
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Hello suhe,
The CRD60DD12N-GMB was designed to operate with a high-switching frequency (100 kHz) and low leakage inductance (~8 uH) so that only the transformer leakage inductance would be necessary to successfully operate the dual active bridge (DAB). Through careful transformer design, this ~8 uH of leakage inductance can be manufactured. Operating below 10 kHz like you mentioned would not be feasible because you would lose zero voltage switching (ZVS) in most operating modes, the transformer current would increase significantly, and the transformer design would need to change dramatically. Many of the concepts of this reference design (e.g., power module routing, gate driver design, cold plate design, etc.) can be applied to other designs operating at different switching frequencies, but we recommend operating this reference design at its target switching frequency of 100 kHz. I provided a slide below that demonstrates some of the design tradeoffs with different switching frequencies.
Thanks,
Chris N.
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Hello suhe,
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.
Thanks,
Chris N.
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