infineon4engi@twitter twitter

infineon4engineers Facebook

infineon@linkedin linkedin

infineon@youtube youtube


+ Reply to Thread
Page 1 of 2 1 2 LastLast
Results 1 to 10 of 13
  1. #1
    New Member New Member Sanyxx is on a distinguished road
    Join Date
    Jan 2019
    Posts
    6
    Points
    37.5

    [SOLVED] TLE9879 BDRV Drain source problem

    Hi
    I use TLE9879-EvalKit for sensorless BLDC motor. Application work perfectly, but i have one problem.
    When motor in not running and all switches are off, i see short circuit on high side switches (see pic.1).
    When motor is running (motor work perfectly), i see short circuit on all switches (see pic.2).
    Disable drain source is not solve problem. What could be the problem? I think problem is BDRV settings, but i not find her.
    ?????? ?????? pic1.jpg‎   pic2.jpg‎  

  2. #2

    Infineon Employee
    Infineon Employee
    Lykaon is on a distinguished road
    Join Date
    Jun 2018
    Location
    Germany
    Posts
    28
    Hi Sanyxx,
    could you please increase the dead time and try again?
    Best regards
    The views expressed here are my personal opinions, have not been reviewed or authorized by Infineon and do not necessarily represent the views of Infineon.

  3. #3
    New Member New Member Sanyxx is on a distinguished road
    Join Date
    Jan 2019
    Posts
    6
    Points
    37.5
    Hi Lykaon
    I tried. Old dead time was 1.5 uS, new 3.5 uS. But it not decided my problem.
    In stop mode all mosfet are off. But status high side mosfets are "drain source detected".
    If i disable one of high-side driver - all ok. But if all three high-side drivers are enabled - all high mosfets are drain source detected.

  4. #4

    Infineon Employee
    Infineon Employee
    Lykaon is on a distinguished road
    Join Date
    Jun 2018
    Location
    Germany
    Posts
    28
    Ok, understood.
    What is your DS_Montitoring threshold?
    The views expressed here are my personal opinions, have not been reviewed or authorized by Infineon and do not necessarily represent the views of Infineon.

  5. #5
    New Member New Member Sanyxx is on a distinguished road
    Join Date
    Jan 2019
    Posts
    6
    Points
    37.5
    DS_Montitoring threshold is 0x3 (1V)
    I attached screenshots all BDRV registers.
    ?????? ?????? 1.jpg‎   2.jpg‎   3.jpg‎   4.jpg‎  

  6. #6

    Infineon Employee
    Infineon Employee
    Lykaon is on a distinguished road
    Join Date
    Jun 2018
    Location
    Germany
    Posts
    28
    Thanks for the pictures. Could you please capture SHx/GHx/GLx with an oscilloscope and post the picture here as well?
    The views expressed here are my personal opinions, have not been reviewed or authorized by Infineon and do not necessarily represent the views of Infineon.

  7. #7
    New Member New Member Sanyxx is on a distinguished road
    Join Date
    Jan 2019
    Posts
    6
    Points
    37.5
    Yellow - GL, Blue - SH, Pink - GH
    SRC04 - zero position
    SRC03 - stop motor condition (DS flags - all high side)
    SRC01 & SRC02 - run motor condition (DS flags - all mosfet)
    ?????? ?????? SCR01.PNG‎   SCR02.PNG‎   SCR03.PNG‎   SCR04.PNG‎  

  8. #8

    Infineon Employee
    Infineon Employee
    Lykaon is on a distinguished road
    Join Date
    Jun 2018
    Location
    Germany
    Posts
    28
    Please measure the High-Side (Gate - Source) differentially. It looks like there is no sufficient DC-Link capacitance or your line impedances are too high -> deep voltage drop (CH3) to high-side gate on.
    The views expressed here are my personal opinions, have not been reviewed or authorized by Infineon and do not necessarily represent the views of Infineon.

  9. #9
    New Member New Member Sanyxx is on a distinguished road
    Join Date
    Jan 2019
    Posts
    6
    Points
    37.5
    I do not have equipment for directly measuring Vgs high side.
    In previous oscilloscope (pic 3) you can see that in stopped mode Vgs of high side mosfets are zero. But DS flags setted.
    I think that i not correct made BDRV settings. I may send you my project for evalkit and GUI in private and you will can saw that problem.

  10. #10

    Infineon Employee
    Infineon Employee
    Lykaon is on a distinguished road
    Join Date
    Jun 2018
    Location
    Germany
    Posts
    28
    Hi,
    are you able to send the project via private message (forum)?
    Best regards
    The views expressed here are my personal opinions, have not been reviewed or authorized by Infineon and do not necessarily represent the views of Infineon.

Tags for this Thread

Disclaimer

All content and materials on this site are provided “as is“. Infineon makes no warranties or representations with regard to this content and these materials of any kind, whether express or implied, including without limitation, warranties or representations of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property right. No license, whether express or implied, is granted by Infineon. Use of the information on this site may require a license from a third party, or a license from Infineon.


Infineon accepts no liability for the content and materials on this site being accurate, complete or up- to-date or for the contents of external links. Infineon distances itself expressly from the contents of the linked pages, over the structure of which Infineon has no control.


Content on this site may contain or be subject to specific guidelines or limitations on use. All postings and use of the content on this site are subject to the Usage Terms of the site; third parties using this content agree to abide by any limitations or guidelines and to comply with the Usage Terms of this site. Infineon reserves the right to make corrections, deletions, modifications, enhancements, improvements and other changes to the content and materials, its products, programs and services at any time or to move or discontinue any content, products, programs, or services without notice.