Hello TI community,
I'm russel. we have current 2400W PSU project using UCC28070 controller.
Right know we are experiencing peak current > 30A during 10ms AC_dropout.
If you experienced this issue before kindly share with us the solution on how to minimize peak current issue.
here our finding.
During dropout, and eventual recovery, the PFC doesn’t soft start. At recovery, the PFC tries to immediately return the bulk voltage (now at 350V) to 400V AND at the same time continue support the output load (2.4kW). This increases the input current a few cycle after recovery.
see attached waveform
Thank you very much.