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TMDSHVMTRPFCKIT, safe stop

vlado
Prodigy 70 points

Hi

Is there any way to stop working TMDSHVMTRPFCKIT inverter kit (V2.1, yellow board) safely and immediately?

There are included current and other useful protections, but everybody at least one time faced with unpleasant situation when something goes crazy (like speed, position, especially at pmsm machine).

For that reason I would like to have, lat say a simple switch (close to my hand, connected to the inverter) which will block PWM signals from DSP immediately.

Cutting main power does not promise that inverter could not be damaged.

DSP stopping from CCS is also unsafe.

Thank you.

  • 0
    TI__Guru 57255 points

    Hello,

    If you're using the HVMTRPFCKIT GUI you could shut it off on the GUI.  However, it sounds like you are using CCS.

    One idea might be to, assuming you aren't using Hall-2, to wire up a simple push-button switch to H1.4 & H1.10 such that when the switch is open the switch does nothing and when the button is pushed it closes and pulls the signal to ground.  You could then configure GPIO-12 (which receives Hall-2) as an TZ-input and configure this TZ input to immediately stop the PWM signals from going to the IPM.


    Thank you,
    Brett

  • 0 in reply to Brett Larimore
    Prodigy 70 points

    Brett, thank you for the reply

    I tried to connect H2 to gnd, but I failed.When H2 input is disconnected, at voltage level translator is voltage level 2.4V, since that chip has some low internal pull down resistor. It yields that at its output is always 0, regardless input is floating or tied to gnd.

    Therefore  using external  switch, H2 must be connected to vcc (PWM works) or to gnd (PWM disabled).

    This works fine.

    Maybe, in a future kit revision, some push button for general PWM stopping will be useful.

    Brett, thank you again for the help.

  • 0 in reply to vlado
    TI__Guru 57255 points

    Hi Vlado,

    I'm glad that you were able to get your setup working as desired!

    I'll add this as a potential feature request for the TMDSHVMTRPFCKIT kit.


    Thank you,
    Brett