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