Inductance capacitance integrated structure implemented by flexible circuit board in EMI filter

Abstract

The invention discloses an integrated structure of an inducer and a capacitor in an EMI wave filter realized through a flexible circuit board, the integrated structure comprises a three magnetic core column closed magnetic circuit. An air gap is arranged on the middle magnetic core column of the closed magnetic circuit, a cylindrical dual-surface flexible circuit board is respectively wound on two side magnetic core columns and is composed of a first insulating layer, a first copper foil, an isolation medium layer, a second copper foil, and a second insulating layer which are overlapped. The first copper foil, the isolation medium layer and the second copper foil of the cylindrical dual-surface flexible circuit board form a common mode capacitor in the EMI wave filter, two cylindrical dual-surface flexible circuit boards form a common mode inductor in the EMI wave filter through a coupling inductor formed by the side magnetic core columns, two cylindrical dual-surface flexible circuit boards form a difference mode inductor in the EMI wave filter respectively through a magnetic circuit composed of the side magnetic core columns and the middle magnetic core column. The integrated structure of the inducer and the capacitor provided by the invention is favorable for decreasing the volume of the EMI wave filter, and improving the power intensity of a power electronic convertor.

Description

Technical field [0001] The invention relates to an integrated structure of passive components, in particular to an integrated structure of inductance and capacitance components in an EMI filter realized by a flexible circuit board. Background technique [0002] At present, the development trend of power electronic equipment is modularization and miniaturization, which requires reducing the volume of each component in the power electronic equipment as much as possible. As one of the necessary components in power electronic equipment, the traditional electromagnetic interference (EMI) filter has the problem of a large number of discrete components and large size, which has become one of the bottlenecks in the process of further miniaturization of power electronic equipment. Summary of the invention [0003] The purpose of the present invention is to provide an integrated structure of inductance and capacitance elements in an EMI filter implemented by a flexible circuit board to re...

AI Technical Summary

Problems solved by technology

As one of the necessary components in power electronic equipment, the traditional electromagnetic interference (EMI) filter has the problem of a large number of discrete components and a large volume, which has become one of the bottlenecks in the further miniaturization of power electronic equipment.

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