{HEAD ~ The power converter} has {TAIL ~ at least one switch} that is operated at a switching frequency that results in switch current flows through the switch 
has
{ HEAD ~ The power converter } has { TAIL ~ at least one switch } that is operated at a switching frequency that results in switch current flows through the switch
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH