Planar Coupled Inductor
Original Publication Date: 1986-Aug-01
Included in the Prior Art Database: 2005-Mar-09
This configuration allows very low cost implementation of planar coupled inductors where the coupling and induced voltages are readily calculatable. It also allows very precise transformation ratios with very limited turn. In the structure shown in Fig. 1, concentric or intermeshed conductor coils W1 and W2 are carried by an insulating film 10 sandwiched between two layers 12, 14 of ferromagnetic material (Fig. 2). In such a configuration, the distribution of magnetic flux surrounding a conductor extends a distance controlled by the permeability of the layered ferromagnetic material, the permeability of the material in the gap between the layers and the length of gap between 12 and 14. By appropriate selection of the above parameters, the flux distribution can be predicted and controlled.