Patent ID: 7915989

Claim:
A magnetic element comprising: a magnetic core assembly for proving a closed magnetic flux path and including a first side plate, a second side plate, a first side pillar, a second side pillar and at least two middle pillars, said first and second side pillars being arranged between said first and second side plates and respectively disposed on bilateral edges of said first and second side plates, said at least two middle pillars including a first middle pillar and a second middle pillar being arranged between said first and second side pillars; and multiple winding coils wound around said at least two middle pillars, wherein said multiple winding coils include a primary winding coil, a first secondary winding coil and a second secondary winding coil, and said first secondary winding coil and said second secondary winding coil are connected to a common node which is between said first and second middle pillars and further connected to a load, wherein there is only DC magnetic flux variation but no AC magnetic flux variation between the common node and the load.