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TIDA-00915: TIDA-00915

Intellectual 980 points

Replies: 16

Views: 721

Part Number: TIDA-00915

Hi..

We are building the reference design TIDA-00915. If we supply that board with AC input will we get DC output? Apart from the issue of power factory correction should we expect or be wary of any other issue?

Regards

Sam

  • *factor
  • In reply to Sam Ref:

    Dear Sam,

    the TIDA-00915 board is a DC/AC inverter and requires DC-input voltage of typically 320VDC. The DC input voltage range is 200V to 450V, please see TIDA-00915 design guide table 2, I've copied the specification below.  

    If you have an AC source, I assume a 230V AC single phase, you will need a bridge rectifier and DC-link capacitors to create a DC voltage with minimum DC-voltage ripple.

    Regards, Martin

  • In reply to Martin Staebler:

    Dear Martin

    Thank you for your response. 

    We understand that TIDA-00915 is an inverter.

    We intend to supply it with three-phase AC to get DC output. We have a reason to do that. Theoretically that should work as that happens all the time when the inverter controls a motor and the motor breaks......we just thought we would ask if there is something that would not allow us to do that in an explicit manner. There might be something in the design that would not permit us to do what we want.

    Regards

    Sam

  • In reply to Sam Ref:

    Dear Sam,

    thank you for the clarification. So you'd plan TIDA-00915 for energy recuperation, while the motor brakes or to use is as 3-phase AC/DC, so you would swap what we called DC input and AC output with our design. The topology supports 4-quadrant operation, as long as you will stay within the LMG3410 ratings for currents, voltages and temperature it should work. You may want to check the ratings of the DC-link capacitor in that design to ensure it can handle the DC-link current and access voltage during braking - if applicable in your design.

    Regards,
    Martin
  • In reply to Martin Staebler:

    Thank you Martin
  • In reply to Martin Staebler:

    Dear Martin

    In relation to our question above; we intend to feed the inverter from its 3-phase AC side and hence we will use it as a rectifier. We have a reason to do that.

     

    Based on the rating of the design 00915 (200V, 8Amp) the maximum AC voltage we can feed must have a peak that does not exceed 110V (peak). Correct?

     

    Without any filtering at the DC side this will directly (without any control) get a fluctuating DC voltage of ~ 190V at the DC side. That is, +/- 95V DC , which is 110V * cos (30)). Correct?

     

    We do not have to use FWD ...with your LMG3410......correct?

    I am asking that last question because usually in circuit drawings of power switches they draw the anti-parallel FWD, while in the circuit drawings of the LMG that FWD is never there.

     

    Regards

    Sam

     

  • In reply to Sam Ref:

    Hi Sam,

    Based on the Table 2 in the Design Guide of TIDA-00915, 3-phase voltage of up to 220VAC RMS can be provided as input if you are using as rectifier. 

    As for the FWD, LMG3410 can operate in third quadrant with 0V gate drive signal and hence does not need an external FWD. However, VSD drop can be as high as 5-7.8V depending on drain current when gate drive voltage is 0V in third quadrant operation(please refer Section 6.5 of LMG3410 datasheet) - so the dead time should be minimal to reduce third quadrant losses.

    Regards

    Siva

  • In reply to Siva Mohan:

    Dear Siva,

    Thank you for the answer.

    220 VAC rms phase to neutral, or  380VAC rms phase-to-phase ….Correct?

    Regards

    Sam

  • In reply to Sam Ref:

    Hi Sam,

    I meant 220V AC rms phase to phase. 380VAC rms phase to phase will give a DC voltage of 537V which is higher than the maximum DC link voltage in Table 2 of design guide. DC link voltage should not exceed 450V and 3-phase AC input should be within a value that does not produce a DC voltage greater than 450V.

    Regards

    Siva

  • In reply to Siva Mohan:

    Hi Siva

    220 VAC rms phase-to-phase will give ~310VDC.....correct?

    Regards

    Sam

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