A separate controller PWMs {HEAD ~ the second switch} generating the output at the secondary side of {TAIL ~ the transformer} 
A separate controller PWMs { HEAD ~ the second switch } generating the output at the secondary side of { TAIL ~ the transformer }
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL