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Short Circuit Protection WAS175M12BM3

User85
User85 Contributor Level 1
edited September 2023 in Module Products

Hello,

we are currently designing a three phase inverter with WAS175M12BM3. For short circuit protection we want to use DESAT protection circuit. Is there any design recommendation for blanking time?

Thank you

Comments

  • Forum_Moderator
    Forum_Moderator Wolfspeed Employee - Contributor Level 4

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

  • PaulKanatzar
    PaulKanatzar Wolfspeed Employee - Contributor Level 2
    edited September 2023

    Please take a look at the reference design files: CGD1700HB2P-BM3 and CGD1200HB2P-BM3. Adjusting the blanking can be achieved by changing the blanking capacitor value.

    Some other notes to consider are:

    1. Minimizing blanking time (tBlank) and soft shutdown resistance (RSS) will result in significant improvement in short circuit survivability.
    2. Focus should be placed on balancing the tradeoff between additional tBlank to prevent false trips and decreasing tBlank to reduce short circuit current peak and short circuit energy.
    3. Selecting a gate driver chip that allows tuneability of both tBlank and RSS is recommended to achieve the highest level of protection.


    Thanks,

    Paul Kanatzar

  • BlakeNelson
    BlakeNelson Wolfspeed Employee - Contributor Level 2

    Hi, 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.

This discussion has been closed.