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  • TI Thinks Resolved

CCS/TIDM-1000: The handbook introduce the operate process of 40V(60Hz),but i use 40V(50Hz), and I want to know this case how to operate

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Replies: 12

Views: 313

Part Number: TIDM-1000

Tool/software: Code Composer Studio

1.As shown above,the experiment use 60 Hz voltage in the second point(current loop build 2),but i only have 50 Hz voltage.And according to the step,my guiVbus voltage is 103V in the seventh point,while the guiVbus of the handbook almost to 190V.

2.When  the basement of current iLRef increae to 0.1,the bus voltage became 266,but in fact,my voltage is 213V.

  • Hi,

    1. 50Hz is ok and should not make a big difference. Have you verified all the sensing and PWM in build 1? Everything ok compared with the user guide?

    2. When you say "my guiVbus voltage is 103V in the seventh point" and "my voltage is 213V", how does the current waveform look like at that time? Is it sine wave?

    Thanks.

    Regards,

    Chen

  • In reply to Chen Jiang ti:

    Hi,

    1.Today,I verified all the sensing and PWM in build 1.Now There are two questions:(1) three phase current is unbalance,Phase B current is much less than phase A and C current.(2)when i clear PWM Tripping, and increase the input voltage, the communication broke off suddenly,as shown below.

    2.In the Powersuite,I don't know how to set parameter,I don't know if I need to set parameters.Especially the capacitance values in the figure below,,all four capacitors on the board are 220 uF,But the figure below shows 180 uF.

  • In reply to user5178791:

    Hi,

    1. yes, the unbalanced current issue needs to be fixed first, otherwise you cannot jump to build 2. We can put the communication issue aside temporarily. The sensing issue can be caused by the sensing circuit or the software, but I will suggest to start with debugging with sensing hardware.

    2. You don't have to change anything in the PowerSUITE unless you are using your own designed hardware. Are you using the TI EVM(directly ordered) or a customized board?

    Thanks.

    Regards,

    Chen

  • In reply to Chen Jiang ti:

    One issue that we have seen is the uneven heating of the inrush resistors at low voltage, maybe for the low voltage build as well you may want to first input 120Vrms, let it run for a few minutes and then reduce to 40Vrms and proceed with the build. 

  • In reply to Manish Bhardwaj:

    Also if there is any way, please check the current drawn itself on a scope for each phase. If you have a three phase source you can see this data on that too, if it is unbalanced on the source then this is not a sensing issue and the above recommendation will help. 

  • In reply to Chen Jiang ti:

    1.This unbalanced current problem may be caused by the voltage regulator.Before On the main side of the voltage regulator,the voltage waveform is sine,but the Secondary side of voltage regulator,B phase current very small compared with A、C phase current.  The three-phase current of A、B、C and N phase current is shown in the figure below.

  • In reply to Manish Bhardwaj:

    OK,I have checked,The voltage regulator may have problems.

  • In reply to user5178791:

    Hi,

    Glad to hear you found the problem. Let us know if you have any questions.

    Regards,

    Chen

  • In reply to Chen Jiang ti:

    During the boost process of build1, the AC side voltage increased, suddenly the CCS interface was stuck, and then the communication was interrupted. I don't know how this was caused. I tried this several times.

  • In reply to Chen Jiang ti:

    After downloading the program, do I need to unplug the connection to the simulator?

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