1results about How to "Improve EMI" patented technology

The utility model discloses a kind of multi-winding plane transformer and flyback switching power supply, belong to transformer technical field, transformer includes magnetic core, coil winding and multilayer circuit board;Primary side drive coil winding is distributed in the 1,6,11,16 layer circuit board, primary side coil winding is distributed in the 2,15 layer circuit board, primary side auxiliary coil winding is distributed in the 5,12 layer circuit board, secondary side main feedback winding is distributed in 3,14 layer circuit board, first secondary side coil winding is distributed in 4,13 layer circuit board, second secondary side coil winding is distributed in 8,9 layer circuit board;Same coil winding on same multilayer circuit board is connected by via hole mode alternately, same coil winding on different multilayer circuit board is connected by printed circuit board's board edge half-hole technology alternately.The plane transformer provided by the utility model can effectively adapt to the use scene of multi-winding and flyback switching power supply, improve power density, reduce electromagnetic interference.