Hello team,
My customer is using the UCC28951 and observing the following waveform at the switching nodes of the H bridge:
The green trace is measured between the transformer and the shim inductor. The converter operates normally, but the shim inductor is also running hotter than expected. Can you give me an idea of what may be causing the issue?
Thank you for your support!
Errol Leon
Texas Instruments
Field Application Engineer
Hello Errol
This looks like the delay times are too long but I'm not sure. Can you post a plot of the waveforms from ground to the three nodes in the diagram.
The shim inductor shouldn't be getting hot - can you check the core material used and calculate the core losses and the size of wire and its resistance to get an estimate of the resistive losses. If the wire is too thick then you may be seeing a very high AC resistance due to skin effect and proximity effect. Let's look at the waveforms first.
Regards
Colin
