Hence, the frequency of {HEAD ~ operation} of {TAIL ~ the power converter} may be varied for regulation purposes without losing the efficiency advantages of a narrow bandwidth drive 
of
Hence , the frequency of { HEAD ~ operation } of { TAIL ~ the power converter } may be varied for regulation purposes without losing the efficiency advantages of a narrow bandwidth drive
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH