Because of the holidays, TI E2E™ design support forum responses will be delayed from Dec. 25 through Jan. 2. Thank you for your patience.

  • State TI Thinks Resolved
  • Locked Locked
  • Replies 5 replies
  • Answers 1 answer
  • Subscribers 64 subscribers
  • Views 195 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

UCD3138PFCEVM-026: The single-phase PFC circuit suddenly stops working after 110V works normally for some time

xiaoxiao xiaoxiao
Prodigy 190 points
Part Number: UCD3138PFCEVM-026

Expert, during single phase operation, I switched from 50V to 110V, the circuit worked normally for a while, then suddenly stopped working. I checked the single-phase connection, but I still can't find the problem. May I ask?
(1) Which parts are most likely to be damaged?
(2) Will the control panel be locked? Because the lights on the control panel are normally on.
(3) If I want to use L1 and Q2 circuits to realize the normal operation of single-phase PFC, is it feasible? If possible, apart from connecting E1 and E5 on the hardware, what needs to be changed on the software?

  • 0
    TI__Expert 3440 points

    Hello,

    1, the components most likely be damaged include the F2, mosFET, Diode.

    2,check the external Vcc is ok or not firstly.

    3, check if the driver on the control board is normal or not?

    4, I don't think you switch the hardware to Q2 is simple way. resolving the issue may easier than switch to Q2.

    thanks 

  • 0 in reply to Bliss Zhou
    Prodigy 190 points

    After the system is powered on, +3.3V and 12V are normal, and the input AC sampling AC_N and AC_L(TP7 and TP14) are normal.  When the voltage is increased to 110V, it indicates that the normal AC input indicator D18 is not on.  The MOS, Diode and F2 on the main circuit were not damaged, the output voltage and input current were waveforms under uncontrolled rectification, that is, the circuit did not enter a closed loop operating state.  Among them, GUI can normally recognize the type of control board, import program and LED lights on the board are also on normally, but there is no output signal (including relays RLY_CTRL, LED_1, LED_2, DPWM signal).  Is there any better way to check whether there is a problem with the control board?

  • 0 in reply to xiaoxiao xiaoxiao
    TI__Expert 3440 points

    XiaoXiao,

    Can you explain detail of "I switched from 50V to 110V, the circuit worked normally for a while, then suddenly stopped working."

    is the Gate driver waveform ok?  Is the output voltage ok?

    thanks 

  • 0 in reply to Bliss Zhou
    Prodigy 190 points

    The input voltage is directly increased from 50VAC to 110VAC, and the circuit enters the normal working state. At this time, the input current is sine wave and the output current is 390VDC. After the circuit works for a period of time, the input current changes from sine wave to waveform as shown below.

    The PWM waveform was not detected at that time, so pictures could not be provided

  • 0 in reply to xiaoxiao xiaoxiao
    TI__Expert 3440 points

    Hello,

    Is the waveform you shared captured with no loading or light loading? normally, It should run into burst mode on no load. Could you try half load?