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Potential saturation in high side gate drive transformer?

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cupoftea

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Hi,
Please may I post this here as its sufficiently different to this post..
https://www.edaboard.com/threads/capacitor-coupled-gate-drive-transformer-problem.402214/

The attached shows two high side FET gate drives. The top one is bad, and the gate drive transformer has a high core flux level in it, so could saturate. Do you agree with the corrected version also shown? (only one FET is being driven here, in each case)

LTspice and jpeg attached
--- Updated ---

The "High side gate drive transformer _1" (attached) shows the fully corrected version.....even if you are only driving one high side FET.....you must put in a dual driver, and make one a dummy ! ...otherwise you could go into saturation ftom magnetising flux!
Why is this never spoken of in any document?
 

Attachments

  • Hi Side gate drive transformer.zip
    2.4 KB · Views: 108
  • High side gate drive transformer.jpg
    High side gate drive transformer.jpg
    170.6 KB · Views: 118
  • High side gate drive transformer _1.jpg
    High side gate drive transformer _1.jpg
    152.2 KB · Views: 106
  • Hi Side gate drive transformer _1.zip
    3.8 KB · Views: 96
Last edited:

Actuall, second thoughts, the above isnt quite up to it...but in the attached, it is a bit strange that the magnetising current has a bigger DC level in it in the top single gate driver, when compared to the bottom dual gate driver
(LTspice attached if you wish)
 

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  • Hi Side gate drive transformer _6.zip
    2.6 KB · Views: 102

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