wherein the current sensor detects {HEAD ~ a current} by calculating {TAIL ~ the difference} between the amount of a current flowing into any of the plurality of primary windings and the amount of a current flowing from the different primary winding, and 
by calculating
wherein the current sensor detects { HEAD ~ a current } by calculating { TAIL ~ the difference } between the amount of a current flowing into any of the plurality of primary windings and the amount of a current flowing from the different primary winding , and
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH