TWM569929U - Common mode filter capable of reducing winding portion's width - Google Patents

Abstract

A common mode filter capable of reducing a width of a winding portion, comprising: a core and a first winding and a second winding respectively wound around the winding portion of the core, the two ends of the winding portion of the core are respectively connected a first flange having a width greater than a height of the first flange, the core being formed with a first notch on a top surface of the first flange, the two flanges The width is greater than the height of the second flange, and the core forms a second notch on the top of the inner side surface of the second flange. Therefore, the creation can effectively reduce the width of the winding portion of the core, thereby reducing the DC resistance and parasitic capacitance of the product, and further improving the high-frequency characteristics of the product, thereby greatly improving the practicality of the creation.

Description

Common mode filter that reduces the width of the winding

This creation relates to a coil component, and more particularly to a common mode filter.

Press, common mode filter is a common coil component, mainly has the function of filtering common mode noise and preventing electromagnetic interference (EMI). Please refer to the figure below as a core for the existing common mode filter. 1. The core 1 has a winding portion 11 (ie, a center pillar) and a pair of flanges 12 respectively connected to the two ends of the winding portion 11, and the top surfaces of the flanges 12 are respectively provided with a plurality of (for example, 2 Or 3) terminal electrodes 13.

However, referring to the first figure, the core 1 of the conventional common mode filter has a width W1 of the flange 12 that is greater than the height H1 of the flange 12, so that in order to match the size ratio of the flange 12, The winding portion 11 is also generally formed as a wide flat column having a relatively large width, resulting in the winding portion 11 having a large width dimension, which causes the conventional common mode filter to have a large DC resistance ( Rdc) and parasitic capacitance, which affect the high-frequency characteristics of the product, therefore, how to improve the above problems, that is, the technical difficulties that the creators of this case want to solve.

In view of the above problems with conventional common mode filters, the purpose of this creation is to develop a common mode filter that can reduce the width of the winding portion.

In order to achieve the above objectives, the present invention provides a method for reducing the width of the winding portion. The common mode filter comprises: a core having a winding portion located in the middle and a pair of first flanges and second flanges respectively connected to the two ends of the winding portion, the width of the first flange being greater than a height of the first flange, a top surface of the first flange is respectively provided with a first end electrode and a second end electrode, the first flange has an outer side facing away from the winding portion and an opposite An inner side surface, the iron core is formed with a first notch on the top of the inner side surface of the first flange, and a bottom of the first notch is flush with a top surface of the winding portion, and the width of the two flanges is larger than the second flange The top surface of the second flange is respectively provided with a third end electrode and a fourth end electrode in the same direction. The second flange has an outer side facing away from the winding portion and an opposite surface. a second notch is formed on the inner side of the inner side of the second flange, and a bottom of the second notch is flush with a top surface of the winding portion; a first winding is wound around the core a winding portion, and two ends of the first winding are respectively connected to the first terminal electrode and the third Electrode; a second wire, are wound on the winding portion of the core, and the ends of the second winding are connected to the second terminal electrode and the fourth electrode terminal.

Wherein, the first flange is provided with a chamfered structure at the junction of the first notch and the winding portion, and the second flange is also provided with a chamfered structure at the junction of the second notch and the winding portion.

Therefore, the creation can effectively reduce the width of the winding portion of the core, thereby reducing the DC resistance and parasitic capacitance of the product, and further improving the high-frequency characteristics of the product, thereby greatly improving the practicality of the creation.

1‧‧‧ iron core

11‧‧‧Winding Department

12‧‧‧Flange

13‧‧‧ terminal electrode

3‧‧‧ iron core

31‧‧‧Winding Department

32‧‧‧First flange

321‧‧‧ outside side

322‧‧‧ inside

323‧‧‧ first gap

324‧‧‧Chamfer structure

33‧‧‧second flange

331‧‧‧Outside

332‧‧‧ inside

333‧‧‧ second gap

334‧‧‧Chamfer structure

41‧‧‧first end electrode

42‧‧‧second end electrode

43‧‧‧Terminal electrode

44‧‧‧ fourth end electrode

H1‧‧‧ Height

H2‧‧‧ Height

H3‧‧‧ Height

S1‧‧‧First winding

S2‧‧‧second winding

W1‧‧‧Width

W2‧‧‧Width

W3‧‧‧Width

The first figure is a schematic diagram of the structure of a core of a conventional common mode filter.

The second figure is a perspective view of one embodiment of the present creation.

The third figure is a top plan view of one embodiment of the present creation.

Please refer to the second and third figures, which are respectively a schematic diagram and a top view of an embodiment of a common mode filter of the present invention. The common mode filter comprises: a core 3 having a core 3 a middle winding portion 31 (ie, a center pillar) and a pair of first flanges 32 and second flanges 33 respectively connected to the two ends of the winding portion 31, the first flange 32 having a width W2 greater than the first convex portion The top surface of the first flange 32 is respectively provided with a first end electrode 41 and a second end electrode 42. Referring to the third figure, the first flange 32 has a back surface. A first notch 323 is formed on the top of the inner side surface 322 of the first flange 32, and a bottom portion and a winding portion of the first notch 323 are formed on the outer side surface 321 of the winding portion 31 and an opposite inner side surface 322. The top surface (ie, the upper surface) of the 31 is flush, that is, there is no height difference between the two, the width W3 of the two flanges 33 is greater than the height H3 of the second flange 33, and the second flange 33 The top surface is respectively provided with a third end electrode 43 and a fourth end electrode 44 in the same direction. More specifically, each of the end electrodes can be a conductive adhesive. Silver glue, please continue to refer to the third figure, the second flange 33 has an outer side surface 331 facing away from the winding portion 31 and an opposite inner side surface 332, the core 3 of the second flange 33 A second notch 333 is formed on the top of the inner side surface 332, and the bottom of the second notch 333 is flush with the top surface of the winding portion 31. In fact, the specific configuration of the second flange 33 and the first flange 32 are actually Same as size.

a first winding S1, the first winding S1 is wound around the winding portion 31 of the core 3, and two ends of the first winding S1 are respectively connected to the first end electrode 41 and the third end Electrode 43.

a second winding S2, the second winding S2 is wound around the winding portion 31 of the core 3, and two ends of the second winding S2 are respectively connected to the second end electrode 42 and the fourth end Electrode 44.

Moreover, in one embodiment of the present creation, the first flange 32 is in the first gap A chamfered structure 324 may be disposed at the junction of the 323 and the winding portion 31. The second flange 33 may also be provided with a chamfered structure 334 at the junction of the second notch 333 and the winding portion 31.

The beneficial effects of the present invention are explained below: Please refer to the second and third figures, by designing the first flange 32 and the second flange 33 of the core 3 to have a width W2, a W3 is larger, and a height H2 and a H3 are compared. The small structure, therefore, in order to match the size ratio of each of the flanges, the winding portion 31 is also generally formed into a narrow-thickness column having a smaller width than the thickness, so that the core 3 can be effectively reduced. The width of the winding portion 31 can reduce the DC resistance and parasitic capacitance of the product, and can further improve the high frequency characteristics of the product, thereby greatly improving the practicality of the creation; in addition, by the first flange 32 and The second flange 33 is respectively provided with the first notch 323 and the second notch 333, and each of the end electrodes can be retracted away from the winding portion 31, so as to avoid or reduce any winding contact to other windings. The terminal electrode to which the wire belongs is caused by the short circuit. In addition, the first notch 323 and the second notch 333 respectively have chamfered structures 324 and 334, so that the core 3 can be more easily demolded during molding to facilitate production. , so that this creation can both enhance product reliability and The efficiency of production efficiency.

Claims (2)

A common mode filter capable of reducing a width of a winding portion, comprising: a core having a winding portion in the middle and a pair of first flanges and second flanges respectively connected to the two ends of the winding portion The width of the first flange is greater than the height of the first flange, and the top surface of the first flange is respectively provided with a first end electrode and a second end electrode, and the first flange has a back surface An outer side surface of the portion and an opposite inner side surface, the core is formed with a first notch on the top of the inner side surface of the first flange, and the bottom of the first notch is flush with the top surface of the winding portion, the two flanges The width of the second flange is greater than the height of the second flange. The top surface of the second flange is respectively provided with a third end electrode and a fourth end electrode in the same direction. The second flange has a back surface. An outer side surface of the portion and an opposite inner side surface, the iron core is formed with a second notch on the top of the inner side surface of the second flange, and the bottom of the second notch is flush with the top surface of the winding portion; a first winding a wire wound around the winding portion of the core, and the two ends of the first winding are respectively connected The first end electrode and the third end electrode; a second winding wound around the winding portion of the core, and two ends of the second winding are respectively connected to the second end electrode and the fourth end electrode. The common mode filter of claim 1, wherein the first flange is provided with a chamfered structure at the junction of the first notch and the winding portion, the second flange A chamfered structure is also provided at the junction of the second notch and the winding portion.