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BOOSTXL-DRV8301: How to find/use Bi-directional Power Supply for 2MTR-DYNO Kit using BOOSTXL-DRV8301

HAOLIN ZHENG
Prodigy 20 points
Part Number: BOOSTXL-DRV8301
Other Parts Discussed in Thread: 2MTR-DYNO

Tool/software:

Hi,

I am planning on using 2 BOOSTXL-DRV8301 to drive the 2MTR-DYNO Kit. Apparently, one of the motor is acting as an active load. However, the energy still needs to be dissipated somehow eventually, on the DC bus through the corresponding BOOSTXL-DRV8301.

I wonder whether you have any suggestion on this, where power can go bidirectionally without burning anything. Currently all I can think of is to use a AC/DC adapter and add a capacitor in parallel to buffer the energy transition so that the energy can be reused by another motor.

 

Many thanks,

Phillip

  • 0
    TI__Genius 12231 points

    Hi Phillip, 

    Thank you for posting to our forum! 

    Do you have a schematic design for this plan using dual BOOSTXL-DRV8301? I am not as familiar currently with this 2MTR-DYNO kit and its necessary commutation/control, and would like to help evaluate the motor current paths to better provide assistance with your question.  

    Regenerative supply is achievable with single bldc driver topology architecture and control,  but the current return paths and control scheme with a dual driver system will have extra considerations to be optimal that i wouldlike to map out for this design. 

    Best Regards,

    -Joshua

  • 0 in reply to Joshua Maize
    Prodigy 20 points

    Hi Joahu,

    Thanks for your reply. Below is the simple schematic. It is really just a simple back-to-back dyno rig with 2 PMSMs, one as DUT and one as active load.

    Thanks,

    Haolin

  • +1 in reply to HAOLIN ZHENG
    TI__Genius 12231 points

    Thank you for the response and diagram.

    Please let me review this idea and possible solutions with my team and follow-up by this upcoming Tuesday or earlier.

    Best Regards,

    -Joshua

  • 0 in reply to Joshua Maize
    TI__Genius 12231 points

    Hi Haolin, 

    Thank you for your patience.  

    HAOLIN ZHENG said:

    Currently all I can think of is to use a AC/DC adapter and add a capacitor in parallel to buffer the energy transition so that the energy can be reused by another motor.

     

    Using this approach you will need to make sure the capacitor is able to withstand the higher voltage spikes, as well be sized appropriately to respond quickly enough to be beneficial. 

    If not trying to supply regenerative voltage back into the battery then you may be able to implement a regeneration-resistor to help dissipate the extra current in a controlled manner, but the draw back will be additional heat added to your system. 

    Another approach would be to simply use a bidirectional power supply to help absorb this push/pull current, if i understand your desire accordingly. 

    I hope these ideas help give a better idea of what may be possible. 

    Best Regards,

    -Joshua