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Original question:

TIDM-1000: open-loop test issue

TIDM-1000: open-loop test

Cherry Zhou
Mastermind 22235 points
Part Number: TIDM-1000


Hi team,

We've got something new from the customer regarding the original thread:

With a load of 750 ohms, the actual multimeter test and CCS monitor have a high DC output of 270 V.

The actual voltage and current testing for three phase AC and CCS monitoring values are also the same.

If you need any further info please let me know, thanks.

Best Regards,

Cherry

  • 0
    TI__Genius 15935 points

    Hi Cherry,

    Is there any PWM output already? Can you check with customer?

    There should be no PWM output at this time.

    Regards,

    Chen

  • 0 in reply to Chen Jiang ti
    TI__Mastermind 22235 points

    Hi Chen,

    Thanks for your support. I'm checking the PWM issue with customer.

    And during the open loop test, the trip is finally cleared by setting Cleartrip to 1, and the amplitude and frequency of the input AC voltage are affected. Please see the following video: 

    Thanks and regards,

    Cherry

  • 0 in reply to Cherry Zhou
    TI__Mastermind 22235 points

    Hi Chen,

    Chen Jiang ti said:
    Is there any PWM output already? Can you check with customer?

    The PWM signal has no output and is monitored by an oscilloscope. When the PWM trip is cleared, i.e. Cleartrip = 1, PWM output. 

    Also why is the PWM output in phase? In-phase should not cause shorting of the upper and lower IGBT tubes, but not. 

    Thanks and regards,

    Cherry

  • 0 in reply to Cherry Zhou
    TI__Genius 15935 points

    Hi Cherry,

    Cherry Zhou said:
    Also why is the PWM output in phase? In-phase should not cause shorting of the upper and lower IGBT tubes, but not. 

    To answer this question, pls refer to page 7 of the user guide. The Q1 and Q2 will be on and off at the same time for each phase. However, it behaves the same if only Q1 and Q2 is on. 

    Regards,

    Chen

  • 0 in reply to Cherry Zhou
    TI__Genius 15935 points
    Cherry Zhou said:
    And during the open loop test, the trip is finally cleared by setting Cleartrip to 1, and the amplitude and frequency of the input AC voltage are affected. Please see the following video: 

    Hi Cherry,

    All the parameters are oscillating for some reason. Though I am not able to recognize what does each value stand for, I feel there are some issue on the hardware side. Basically, if the cleartrip is not set to 1, there is no PWM output which is the case from customer side. So it is mainly the three phase diode rectifier that is working. In that case, I will suggest to double confirm the h/w stage by stage without enabling PWM.

    Regards,

    Chen