Hi expert:
One of the current waveforms of my secondary synchronous rectifier has achieved ZCS, and the other has not. The two waveforms form a cycle. I don’t know why the secondary synchronous rectifier is turned on twice in Figure 2 and the ZCS is not realized. Figure 3 is the Simplis simulation waveform. The synchronous rectifier tube uses BSC098N10NS5, and the synchronous rectifier control chip uses MP6908A.
Figure 1
Figure 2
Figure 3
Thank you.