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Some problems with CRD-22DD12N during use

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liu
liu Contributor Level 1
edited October 2024 in General

First of all, thank you very much for the answer to my last question, but I still have some problems during the use of the CRD-22DD12N and would like to be helped.

According to the operating manual, ‘In charging mode, the output voltage is calculated by the digital controller when the input voltage is between 650V and 900V, and the output voltage setting is disabled when the input voltage is between 650V+3V or 900V-3V after start-up ’.

Why limit the adjustment range? This setting does not seem to be conducive to practical application. Is it possible to adjust the output voltage when I want to have a different input voltage? For example, if the input voltage is 700 V, the output is 530.4 V through the manual, but is it possible to set it to 300 V, what should I do if I can, and what will happen if not?

We look forward to hearing from you, thank you very much！

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  • Forum_Moderator
    Forum_Moderator Wolfspeed Employee - Contributor Level 5
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    Thank you for your post, it has been approved and we will respond as soon as possible.

  • FrankWei
    FrankWei Wolfspeed Employee - Contributor Level 2
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    Hi Liu,

    do you mind to tell me how do you get the Wolfspeed 22kW DCDC hardware?

    anyway, let me answer your question here. to optimize the performance of the CLLC converter, we try to let it operate at fsw close to the resonant frequency of the DCDC stage. if you want to get the output voltage between 490V to 688V, actually you can adjust your PFC output voltage accordingly. it is also the input of the DCDC stage. this design does match the actual requirements of EV charging application. if you want to get 300V output, you can configure the converter as you want. anyway, if you want to have your own control on your own hardware, please feel free to do it.

    Regards,

    Frank

  • liu
    liu Contributor Level 1
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    Hi Frank,

    thank you very much for your reply, we will test it when we are sure it is safe to do so, and there may be some silly questions to ask you in the future.

    The company provided me with this device and asked me to test it, and I didn't know how the hardware came about.

    Regards,

    Liu

  • liu
    liu Contributor Level 1
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    Hi Frank,

    during the use of CRD-22DD12N we found that the output voltage will change with the change of input voltage, I tried to stabilize the output voltage at 300V, but failed.

    Can the CRD-22DD12N stabilize the output voltage at a certain value no matter what the input voltage is? What would I do if I could. If not, can you recommend a product that meets this condition?

    Regards,

    Liu

  • TBhatia
    TBhatia Wolfspeed Admin - Contributor Level 5
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    Hello Liu,

    The lead designer for CRD-22DD12N who replied to you before is out of office on National Holiday currently. The response will be delayed until next week. Thank you for your patience!

  • FrankWei
    FrankWei Wolfspeed Employee - Contributor Level 2
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    Yes, you can get the output voltage 300V if it is a verified unit from Wolfspeed. please follow the user guide.

    however, if you want to optimize the performance of your DCDC stage for a 300V output, please try to redesign the transformer and optimize the FW control. CRD-22DD12N was optimized for ~600V output.

    Regards,

    Frank

This discussion has been closed.