Optimal Design of Parasitic Capacitance Based on Matrix Magnetics for Planar Inductor
When the turns of the single-layer winding of the planar inductor exceeds one,the electric field energy stored between the outer windings will make the parasitic capacitance larger.To reduce the parasitic capacitance of the planar inductor,spliting an inductor into multiple discrete inductors to achieve a single-layer-one-turn winding scheme is proposed and the changes in core loss,copper loss and volume are analyzed.Aiming at reducing the volume of discrete inductors,a matrix magnetic scheme is proposed;two-inductor and four-inductor magnetic integrated structures are provided.The finite element simulation results show that the matrix magnetic scheme reduces the parasitic capacitance by 77%,and reduces the copper loss by 70%.Finally,a buck converter is built in this paper and the power experiment results show the planar inductance of the matrix magnetic structure has better performance.
万方数据
维普
