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DRV8301 six step operation

John Miller51
Prodigy 80 points
Other Parts Discussed in Thread: DRV8301, BOOSTXL-DRV8301, LAUNCHXL-F28027F, BOOSTXL-DRV8305EVM, DRV8305

I'd like to find out if the DRV8301 kit with boost XL is capable of generating a six-step only 3-phase waveform.  My application requires this at the switching frequency, such as 20kHz.

I'm in contact with another user of this kit but they are involved in basic motor control at conventional base frequencies.

If the DRV8301 can do this then its what I'll purchase.

Thanks,

JMM

  • 0
    TI__Mastermind 21305 points

    John,

    Do you mean if the hardware is capable of this or if we have a software demonstration?

    The BOOSTXL-DRV8301 is certainly capable of generating a standard six step block commutation table. It provides direct control of each half-bridge through the INH_X and INL_X pins. You will have to provide the proper sequence to the logic inputs.

    The current motor software support we have for this kit is with the LAUNCHXL-F28027F LaunchPad which supports a field oriented control software through InstaSPIN-FOC.

    Nothing will prevent you from coding up a six step table on your own.

  • 0 in reply to Nicholas Oborny
    Prodigy 80 points

    Hi Nick,

    Maybe I shouldn't have said SVM in this.  What I'm after is just a clean 3-phase block mode but at the switching frequency, and preferably adjustable duty.  For example, phase-A is at +Ubus for 80% of Ts/2 then -Ubus for 80% of Ts/2, and so on for phases-B, C.  Does this help clarify my question?

    Thank you,

    John

  • 0 in reply to John Miller51
    TI__Mastermind 21305 points

    John,

    DRV8301 can do this but the logic is not stored internally. It is just a simple triple half-bridge driver. An external MCU would need to send the correct input signals to the A, B,  and C half-bridges.

    Our DRV8305 device does have this internally. If you look in the DRV8305 datasheet, it is under the name 1PWM mode. The BOOSTXL-DRV8305EVM should release sometime this week for device evaluation.