High temperature resistant common mode inductor with shielding layer with magnetic core embedded in pcb

Abstract

The invention relates to a high temperature resistant common mode inductor having shielding layers and a magnetic core embedded in a PCB. The high temperature resistant common mode inductor having the PCB, and the magnetic core vertically embedded in the PCB; the PCB includes n insulating layers forming n+1 board layers, n+1 shielding layers forming in each board layer, and a coil; the coil adopts a multi-wire duplex winding structure including a plurality of parallel wires; the coil includes k winding parts, and k-1 connection parts for connecting two adjacent winding parts; the first winding part, the second winding part, ..., and the k winding part are positioned in the m-th board layer, the m+2 board layer, ..., and the m+2(k-1) board layer respectively, and each winding part is formed by allowing wires to travel a distance around a central column of the magnetic core; the connection parts are of through hole structures; and in the board layers where the winding parts are located, the shielding layers surround the winding parts of the coil. The problem that high frequency filter characteristics of the general common mode inductors are poor, the production cost is reduced, a high temperature resistant characteristic can be achieved by adoption of a suitable material, and the demand of a severe environment can be satisfied.

Description

technical field [0001] The invention relates to a common-mode inductor, in particular to a high-temperature-resistant common-mode inductor with a shielding layer embedded in a PCB. Background technique [0002] The existing common mode inductor is composed of a magnetic core and two sets of coils wound on the magnetic core, as shown in the attached figure 1 As shown, because of the existence of parasitic inductance, it will cause poor high-frequency characteristics. The reason is that the parasitic capacitance of the coil is affected by the high frequency. figure 2 The characteristic curve of the 0.8mHCE1755-AL common mode inductor is shown. However, aviation equipment requires a conduction radio frequency emission of 150kHz to 152MHz to be wider than the common EN55022 frequency bandwidth (as attached Figure 11 shown), EN55022 frequency only to 30MHz (as attached Figure 12 shown). Ordinary common mode inductors are not effective for aviation equipment. Therefore, it...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a high-temperature-resistant common-mode inductor with a shielding layer that solves the problem of poor high-frequency filtering characteristics and improves the filtering characteristics.

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