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UCC28019A: Input current resonance

Hicham Lhachimi
Prodigy 110 points
Part Number: UCC28019A

Hi,

In fact, I have used the UCC28019A for an AC/DC board that should operate from 100V 50/60 Hz to 265V 50/60 Hz, everything is working fine for me. In the case of 265V, I reached a power of 1200 W for an output voltage of 400V with a perfect power factor 0.99 and with a good current form. Also in the 100V case, I reached 400W with a good power factor and a good current form. The problem for me is that I want to reach 550 W in the case of 100V. But here is the problem: 

When I reach 420W, with a 100V/50Hz as an example for the input voltage, I notice that at each half cycle there is a resonance that remains for 5ms in the input current, I also hear a sound coming from the boost inductor (this inductor has a maximum rms current of 8A). My question is how can I get rid of this resonance and maintain a good sinusoidal shape of the input current. Here are the critical components used for compensation of the UCC28019A:

Vcomp components: Rvcomp=25.5kR    Cvcomp=10uF , Cvcomp_p=0.68uF.

Icomp components: Cicomp= 1300pF.

Rsense=0.03 R

I have tried to add a 100 kR resistor in series with the Cicomp capacitor and I noticed a little filtering of the resonance but it still remain in the current form. I have also tried to use a resistor of  1.2MR and a capacitor Cicomp of 820 pF but the problem of the resonance still remain. So I hope that I can solve this problem with your help and support.

And thank you in advance..

  • 0
    TI__Expert 8990 points

    Hi, 

    could you upload a waveform to explain your comment well?

    Have you tried to decrease Rsense? 

    Yunsheng

  • 0 in reply to Yunsheng Qu
    Prodigy 110 points

    Hi Yunsheng,

    Thanks for your reply,

    Below, the current form 

    For the Rsence resistor, it's already small compared to what is used in 1000W PFC applications.

  • 0 in reply to Hicham Lhachimi
    TI__Expert 8990 points

    Hi, 

    The waveform you showed is the input current, could you also capture PFC inductance current as along as input current. if the PFC inductance current is normal, the issue would be related to input filter design.

    Then i recommended to increase capacitance after bridge diode. 

    Yunsheng

  • 0 in reply to Yunsheng Qu
    Prodigy 110 points

    I can't  capture the PFC inductor (1mH) current since it's mounted on a PCB, but increasing the capacitor to 1uF  didn't allow me to solve the problem, since the capacitor used before was 0.33µF. To resume my board is capable of delivering more power for all voltages, but when this resonance happens, the AC source shuts down since the current is more than the maximum allowable by the AC source.

    For 220V, this resonance happens when I go more than 1100W.

    For 200V, this resonance happens when I go more than 1000W.

    For 100V this resonance happens when I go more than 400W. 

    If I can remove this resonance, I can go for more power. 

  • 0 in reply to Hicham Lhachimi
    TI__Expert 8990 points

    Hi, Hicham

    Could you connect the PFC to AC grid? And try to increase output power?

    I encountered the resonance with AC source if the power capability of AC source is not enough, and AC source has its loop response also, it may resonance at certain output power level. 

    Yunsheng

  • 0 in reply to Yunsheng Qu
    Prodigy 110 points

    Hi Yunsheng,

    Thanks for your reply,

    In fact, the AC source that I am using has a power of nearly 1500 W, the problem is that at 100Vac, the resonance happens at 400W, I don't know if adjusting the compensation components of the UCC28019ADR  or decreasing the Rsense from 30mR to 10mR can lead to some improvements. I have also removed the capacitor after the bridge diode to see if it generates resonance with the boost inductor, but the problem still persist.

  • 0 in reply to Hicham Lhachimi
    TI__Expert 8990 points

    Hi, Hicham

    I understand your AC source is 1500W, the resonance happens at 400W at 100Vac, and it also resonant at 1000W/200V. So to AC source, the output current is almost same, that would be the resonance condition to AC source. I think it is worthy to test with AC grid. 

    Yunsheng

  • 0 in reply to Yunsheng Qu
    Prodigy 110 points

    Hi Yunsheng,

    Thanks for your reply.

    I will have to look for a varistor to avoid voltage spikes as a protection for my circuit before connecting the PFC to AC grid. I will let you know about it in the coming days.


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