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TINA/Spice/UCC28070: Designing 1000W supply

Eddie Koh
Genius 10635 points
Part Number: UCC28070
Other Parts Discussed in Thread: TINA-TI,

Tool/software: TINA-TI or Spice Models

Using UCC28070 for interleave PFC.

When simulating in PSPICE the model from TI website, I don’t see the input current getting in phase with the voltage. It seems the PWM is not working as I don’t see the current waveshape like a enveloped sinusoidal.

1. Can help to advise on how to make PSPICE simulation work in interleave PFC?

2. Can help to advise the circuit setup to achieve a 1000W design using UCC28070?

  • 0
    TI__Genius 13660 points

    Hi Eddie,

    For question 2:

    You can find many reference design of UCC28070 on the TI website, http://www.ti.com/product/UCC28070/toolssoftware

    here is a 1.2kW Universal Input Interleaved CCM PFC Power reference design, http://www.ti.com/tool/pr779 , I think it is closest to your requirement. Besides, I have attached UCC28070 Excel Applications Design Tool, which could speed up your calculation and design.

    UCC28070 Design Tool _RevA.xls

    For question 1:  

    I have contacted one of modelling team to answer you.

    Regards,

    Teng

  • 0
    TI__Intellectual 2680 points

    Hi Eddie,

    The input current in Pspice model is plotted below.

    Do you expect a sinusoidal nature here?

    I looked into the model and it seems the above current nature is due to GBU6J. This model is drawing this current from input source. I am debugging this and get back you with reason for above behavior.

    I am looking into your query regarding if the Pspice model can wok for interleaved PFC and will get back to you on this.

    Thanks & Regards,

    Saket

  • 0 in reply to Saket
    TI__Genius 10635 points
    Hi Saket,

    Here's the feedback from customer:

    Do you expect a sinusoidal nature here?

    Customer>>>Yes of course. PFC cannot achieve power factor 0.99 without having the current synchronized with the voltage. THD measurement will be high if that’s the current waveform.

    You should also see some switching currents riding on the AC currents but should be small. The waveform looks like the PFC controller is not switching. Only the bridge rectifier function here.
  • 0 in reply to Eddie Koh
    TI__Intellectual 2680 points
    Hi Eddie,

    The UCC28070 transient model is derived from UCC28070 average model. We will not observe any switching waveform here and voltage and current at nodes are respective averaged values.

    As per my understanding, the current shaping circuit is not modeled and that is the reason we do not see any sinusoidal shape of input current and as you pointed out model is not actually replicating PFC operation.

    So, as this is an average model based transient design we will not able to use it for interleaving, sync or similar features.

    Thanks & Regards,
    Saket