Integrated EMI filter structure based on flexible metal foil material

• Main Authors: CHEN WEI, LIN SUBIN, ZHANG LIPING, PAN JIANGNAN
• Format: Patent
• Language: Chinese; English
• Published: 09.08.2022
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; INDUCTANCES; MAGNETS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES; TRANSFORMERS

The utility model provides an integrated EMI (Electro-Magnetic Interference) filter structure based on a flexible metal foil material, which adopts an EE-type magnetic core with a three-winding column structure, side columns are wound by conventional windings to form common-mode windings, and middle columns are wound by flexible metal foils to form differential-mode windings and are integrated with Y capacitors at the same time; each basic unit of the flexible metal foil winding is composed of an L line, an N line and a G line, wherein the L line, the GND line and the N line are insulated through dielectric layers. On the basis of simplifying the design and reducing the cost, the structural capacitance is increased by using the advantages of the flexible material. Meanwhile, the flexibility of the flexible material is exerted, the applicability of the same EMI filter integrated structure is widened, and different requirements of LC-type, tau-type, pi-type and T-type filters and the like can be met through dif