At full drive, {HEAD ~ the converter} is working in {TAIL ~ block mode}, and in the rest of the modulation range the converter is working in pulse mode 
is working in
At full drive , { HEAD ~ the converter } is working in { TAIL ~ block mode } , and in the rest of the modulation range the converter is working in pulse mode
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH