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UCC28180: AC input current of PFC based UCC28180 is not sine wave

Bill Xu
Intellectual 1510 points

Part Number: UCC28180

Dear application engineer

I'm design in UCC28180 in my electrosurgical tools as PFC controller. during debug, I find that the AC input current is not sine wave as I expected. my test result as below.

image.png

my schematic as below.

sluc506c--20251105.xls image.png

my test condition is:

input voltage: 220VAC

output voltage: 400V.

output power: 200W.

my calculation as below.

sluc506c--100KHz-LMG3650R025.xls 

could you please guide me to make the input current to sine wave? big thanks.

regards,

Bill

 

  • 0
    TI__Intellectual 1455 points

    Hi Bill,
    Can you please try to capture ICOMP, VCOMP pin voltage along with input voltage and inductor current? Try to capture the waveform similar way that you have captured the previous waveform.
    Thanks
    Sanchayan

  • 0 in reply to Sanchayan Das
    TI__Intellectual 1510 points

    Hi, Sanchayan

    nice to e-meet you in here and big thanks for supporting. test result as below figure shows.

    1. Green: Icomp

    2. Yellow: current of inductor.

    3. pink: Vcomp

    4. cyan: input voltage.

    BTW, the testing condition has a little change as below

    1. AC source was changed. the table AC programmable power supply was occupied by other guys. so, I use a 1-phase from a 3-phase AC programmable cart power supply.

    2. GaN was breaked. So I use a MOSFET to replace GaN. the PFC controller has no any updates.

    I don't think this will impact the test result.

    let me know if you need any testing again. thanks.

    regards,

    Bill

      

  • 0 in reply to Bill Xu
    TI__Intellectual 1455 points

    Hi Bill,
    The waveforms look all correct to me. Can you share the inductor current, Input voltage and input current on your current set up that you have taken these waveforms?
    Thanks
    Sanchayan

  • 0 in reply to Sanchayan Das
    TI__Intellectual 1510 points

    Hi, Sanchayan

    here is input current, voltage, inductor current and Icomp

         

    Yel: inductor current

    Green: Icomp

    Pink: input current

    Cyan: Input voltage(220V)

    test conditions:

    1.input voltage: 220VAC

    2. output voltage: 396V

    3.output current: 0.6A.

    thanks.

    regards,

    Bill

      

  • 0 in reply to Bill Xu
    TI__Intellectual 1455 points

    Hi Bill,
    The input current waveform on the left looks correct to me. The issue that you asked earlier about the input current shape being non sinusoidal seems to be resolved. Do see any other issue with the input current shape?
    Thanks, and regards
    Sanchayan

  • 0 in reply to Sanchayan Das
    TI__Intellectual 1510 points

    Hi, Sanchayan

    the test condition for left and righ waveform is exactly same. just osillscope time range different. the only different is the left waveform show 1.5 period, but right waveform show 4.5 period. is this meet UCC28180's performance? thanks.

    regards,

    Bill   

  • 0 in reply to Bill Xu
    TI__Intellectual 1455 points

    Hi Bill,
    In the right waveform number of samples per second is much lower than the left image which might be reason for this. The current shape looks correct to me. Are you seeing any other issue with it?
    Thanks
    Sanchayan