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