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TIDM-1000: power up problem

Ingo Weisel
Prodigy 20 points

Part Number: TIDM-1000
Other Parts Discussed in Thread: TMDSCNCD280049C,

Hi Experts,

we created a 20kW custom pfc design based on your tidm-1000 platform. the controlcard we are using is TMDSCNCD280049C. Everything is working fine as long as we are powering the controlboard before connecting to the ac lines. If both were switched on together an overcurrent fault appears which is not clearable. Further investigations show that if we connect the 3 line voltages to the corresponding ADCs later after switching AC and controlcard voltage on, everything is fine again. Has anyone an explaination for this behaviour? The only solution for our problem we see so far is to delay the 3 voltage measurement signales after switching on.

Thanks for your input.

Best Regards Ingo

  • 0
    TI__Genius 16085 points

    Hi Ingo,

    Ingo Weisel said:
    Everything is working fine as long as we are powering the controlboard before connecting to the ac lines.

    when you say connecting to the ac lines, are you referring to power up AC input or just connecting without AC input?

    Regards,

    Chen

  • 0 in reply to Chen Jiang ti
    Prodigy 20 points

    Hello Chen,

    thanks for your fast reply,

    we first connect a external 12V supply voltage for controlcard and all other measurement circuits, after a short delay we connect the 3 AC voltages (230V) in this procedure it works really perfect. If the 3 AC voltages are present bevor the supply voltage is on we get a fault (therefor we use an voltage source supplied by the bus voltage). We also can start the unit without problems if we connect the measuring voltage to the amplifier circuit after a delay so the ADCs only get the midpoint voltage of 1,65V for the delay time. So we guess the software requires the midpoint voltages of the amps for some kind of initialization but we cant find this part of software.

     

    Regards,

     

    Ingo

  • 0 in reply to Ingo Weisel
    TI__Genius 16085 points

    Hi Ingo,

    I think as long as the ADC input is not exceeding the input range, the sequence you mentioned should not impact. I don't think we have any kind of initializations s/w that requires the specific ADC input.

    Regards,

    Chen