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TMDSHVMTRINSPIN hardware power ground level issue

shin yongcheol
Prodigy 245 points

Other Parts Discussed in Thread: TMDSHVMTRINSPIN

I'm trying to install TMDSHVMTRINSPIN hardware install.

According to Hardware user's guide, I have checked all necessary process.

But finally I found all grounds are not zero voltage, the grounds voltage level are around -200 v DC.

When I try to measure some point with oscilloscope, but I connect oscilloscope' minus probe to ground,

all electricity line in my home were power out.

I don't know what the problem is.

Also I don't know the Hardware has his own problem.

please someone help me.

  • 0
    Prodigy 245 points
    I found that this system is floating ground

    Ground Levels and Safety
    • The user must not touch any part of the board or components connected to the board while energized.
    • The kit can accept power from the AC Mains/wall power supply, the board only uses the live and the neutral line from the wall supply, the protective earth is unconnected (floating).
    • The AC rectifier generates the DC voltage the ground of which is floating from the protective earth ground. Hence appropriate caution must be taken while connecting scopes and other test equipment to the board.
    • The IPM Heat sink is isolated from the board. However high voltage switching generates some capacitively coupled voltages over the heat sink body. Hence the user must not touch any part of the board, the kit or its assembly while energized.
    • The power stages on the board are individually rated. It is the user’s responsibility to make sure that these ratings (i.e. the voltage, current and power levels) are well understood and complied with, prior to connecting these power blocks together and energizing the board and / or simulation.
  • 0 in reply to shin yongcheol
    TI__Genius 15965 points
    Hi Yongcheol,

    It seems like you have solved the problem. Thanks for letting us know.

    Best regards,
    Chen
  • 0 in reply to Chen Jiang ti
    TI__Intellectual 2925 points

    Hi Yongcheol,

    The HV_Kit you are using is not isolated. So you need isolation probe or isolated input power to connect oscilloscope probe. Also don't touch any components and signals including grounds during power on for safety. 

    Thanks,

    Steve