{HEAD ~ a first switching element} coupled to the power supply conversion circuit and switching {TAIL ~ the power supply conversion circuit} into one of an active state and an inactive state, 
switching
{ HEAD ~ a first switching element } coupled to the power supply conversion circuit and switching { TAIL ~ the power supply conversion circuit } into one of an active state and an inactive state ,
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH