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TMS320F28377S: TMS320F28377S

ismail tezol
Prodigy 20 points

Part Number: TMS320F28377S

Hello,

I have some problems with my controller board, which has a TMS320F28377S as a microcontroller. I'll try to explain it. I have an Inverter board and a controller board. Controller board regulates the gate signals of the inverter and could be attached to the inverter board. On the inverter board, I have two different measurement circuits, one of them is for the voltage measuring and another one for the current. the output of both measurement circuit is a voltage value. (for current 1.15 - 2.65 V , for Voltage 0 - 2.88V). So each of these outputs are connected to the TMS320f... ADC pins to handle these signals. For current measurements, I get the correct value and signal at the ADC pins of the DSP and everything is okay. But for Voltage measurements, I get a periodic signal which is shown in the picture. Has someone any knowledge, what could be the problem? 

The picture below should show a constant signal with a little offset about zero. 

and next picture should be a constant signal about 2.88 V.

  • 0
    Guru 192875 points
    Hi Ismail,

    How are you generating this sine kind of signal from controller (using DAC?) Did you try plotting the voltage signal in CCS graph utility? Also, is the pink channel the actual ADC input (at the ADC pin)?

    Regards,
    Gautam
  • 0 in reply to Gautam Iyer
    Prodigy 20 points
    hi,
    When I try to measure Zero voltage I get the first Picture..
    Second one is ,when I try to measure 2.88 V . I cannot explain how did these created. What i can say is, it should have a constant value. The measured signal Comes from Inverter. It has a voltage measurement circuit on the Inverter. It divides 48 volt to 2.88 V with two resistors and an amplifier. I also measure currrents, which is between 1.15-2.65V and it works well.

    I did the measurement with osciloscope.

    thx