阅读说明：本技术 共模差模一体化电感 (Common mode and differential mode integrated inductor ) 是由 林壮 于 2019-04-16 设计创作，主要内容包括：本发明提供了一种共模差模一体化电感,包括：共模电感组件和差模电感组件,其中,共模电感组件包括至少一个第一磁芯、第一组绕线和第二组绕线；差模电感组件包括至少一个第二磁芯；共模电感组件内嵌于差模电感组件中,且位于至少一个第二磁芯中间；第一组绕线和第二组绕线以正耦合方式同时缠绕在至少一个第一磁芯上。本发明提出的共模差模一体化电感体积小,成本低,电磁干扰抑制效果好。(The invention provides a common mode and differential mode integrated inductor, which comprises: the common mode inductance assembly comprises at least one first magnetic core, a first group of winding wires and a second group of winding wires; the differential mode inductance assembly comprises at least one second magnetic core; the common mode inductance component is embedded in the differential mode inductance component and is positioned in the middle of the at least one second magnetic core; the first set of windings and the second set of windings are wound simultaneously on the at least one first magnetic core in a positive coupling manner. The common-mode and differential-mode integrated inductor provided by the invention has the advantages of small volume, low cost and good electromagnetic interference suppression effect.)

1. A common mode and differential mode integrated inductor is characterized by comprising: a common mode inductance component (105) and a differential mode inductance component (108), wherein,

the common mode inductance assembly (105) comprises at least one first magnetic core (103), a first set of windings (100) and a second set of windings (101);

the differential mode inductance assembly (108) comprises at least one second magnetic core (104);

the common mode inductance component (105) is embedded in the differential mode inductance component (108) and is positioned in the middle of the at least one second magnetic core (104);

the first set of windings (100) and the second set of windings (101) are wound simultaneously on the at least one first magnetic core (103) in a positive coupling manner.

2. A common mode and differential mode integrated inductor according to claim 1 wherein the differential mode inductor assembly (108) further comprises a stub (106), a shoe (107) connecting the stub (106) and the at least one second magnetic core (104), wherein,

at least one second magnetic core (104) is arranged around the center pillar (106);

the at least one second magnetic core (104) is spaced a set distance from the center leg (106).

3. A common-mode and differential-mode integrated inductor according to claim 2, characterized in that at least one first magnetic core (103) is placed on the bottom support (107) and the central hole of at least one first magnetic core (103) passes through the middle leg (106).

4. A common-mode and differential-mode integrated inductor according to claim 3, characterized in that if the number of the first magnetic cores (103) is more than one, the plurality of first magnetic cores (103) are arranged on the bottom support (107) in an inner-outer nesting manner.

5. A common-mode and differential-mode integrated inductor according to claim 3, characterized in that if the number of the first magnetic cores (103) is more than one, a plurality of the first magnetic cores (103) are arranged on the bottom support (107) in an up-and-down overlapping manner.

6. A common-mode and differential-mode integrated inductor according to claim 1, characterized in that at least one first magnetic core (103) is used to provide a low frequency common-mode inductor.

7. A common-mode and differential-mode integrated inductor according to claim 6, characterized in that at least one first magnetic core (103) is made of a magnetic core material providing impedance in the KHz range.

8. A common-mode and differential-mode integrated inductor according to claim 6, characterized in that at least one first magnetic core (103) is made of Mn-Zn material.

9. A common-mode and differential-mode integrated inductor according to claim 6, characterized in that the permeability of at least one first magnetic core (103) is within a first set range.

10. A common-mode and differential-mode integrated inductor according to claim 1, characterized in that at least one first magnetic core (103) is further adapted to provide a high frequency common-mode inductor.

11. A common-mode and differential-mode integrated inductor according to claim 10, characterized in that at least one first magnetic core (103) is made of a magnetic core material providing an impedance in the MHz range.

12. A common-mode and differential-mode integrated inductor according to claim 10, characterized in that at least one first magnetic core (103) is made of nickel-zinc material or nanocrystalline material.

13. A common-mode and differential-mode integrated inductor according to claim 10, characterized in that the permeability of at least one first magnetic core (103) is within a second set range.

14. A common mode and differential mode integrated inductor according to claim 1 wherein the second core (104) is made of a material providing KHz level impedance.

15. A common mode and differential mode integrated inductor according to claim 1 wherein the permeability of the second core (104) is within a third set range.

16. A common-mode and differential-mode integrated inductor according to claim 1, characterized in that the second core (104) is made of ferrite material.

17. A common mode and differential mode integrated inductor according to claim 1, characterized in that the second magnetic core (104) is a PM type magnetic core or a CQ type magnetic core.

Technical Field

The invention relates to the technical field of electromagnetic interference, in particular to a common-mode and differential-mode integrated inductor.

Background

In order to reduce the Electromagnetic Interference and radiation Interference of the product, the electronic product is subjected to an EMI (Electromagnetic Interference) test. The frequency range of the test is very wide, and the conduction test frequency range is generally as follows: 150 KHz-30 MHz. The radiation test frequency band is generally: 30MHz to 1 GHz. Therefore, different inductances are required to suppress the interference current for passing the test. For interference currents there is generally a separation into differential and common mode components. Typically the differential mode component is at a low frequency of a few hundred KHz while the common mode component covers a wide range from KHz to MHz. Therefore, the EMI filter needs to include a differential mode inductor, a low frequency common mode inductor and a high frequency common mode inductor. The traditional EMI filter inductor comprises an independent differential mode inductor, a low-frequency common mode inductor and a high-frequency common mode inductor, wherein the differential mode inductor filters out a differential mode component of interference current, which is usually differential mode current in KHz level; the low-frequency common mode inductor filters low-frequency common mode components of interference signals, and the low-frequency common mode components are usually hundreds of KHz to several megaHz; the high-frequency common mode inductor filters out high-frequency common mode components of interference signals, and the high-frequency common mode components are usually above 10 MHz. The conventional EMI filter inductor has the following problems: the traditional EMI filter inductor is independent of a differential mode inductor, a low-frequency common mode inductor and a high-frequency common mode inductor, occupies a large volume range of a product, and is not beneficial to improving the power density of a system; secondly, the cost of the traditional EMI filter inductor is high; thirdly, the magnetic circuit of the traditional EMI filter inductor is easy to couple with other external components (especially components with high-frequency jitter), and the EMI inhibition effect is reduced.

Disclosure of Invention

The embodiment of the invention provides a common mode and differential mode integrated inductor which has small volume, low cost and good electromagnetic interference suppression effect, and the common mode and differential mode integrated inductor comprises the following components: a common mode inductance component and a differential mode inductance component, wherein,

the common mode inductance assembly comprises at least one first magnetic core, a first set of winding wires and a second set of winding wires;

the differential mode inductance assembly comprises at least one second magnetic core;

the common mode inductance component is embedded in the differential mode inductance component and is positioned in the middle of the at least one second magnetic core;

the first set of windings and the second set of windings are wound simultaneously on the at least one first magnetic core in a positive coupling manner.

In the embodiment of the invention, the first group of windings and the second group of windings are simultaneously wound on the at least one first magnetic core in a positive coupling mode, the at least one first magnetic core can be integrated together, the differential mode inductance component comprises the at least one second magnetic core, the common mode inductance component is embedded in the differential mode inductance component and positioned in the middle of the at least one second magnetic core, and the at least one first magnetic core and the at least one second magnetic core can be integrated, so that the common mode and differential mode integrated inductor has small overall size and low cost, the common mode inductance component is embedded in the differential mode inductance component, the coupling with other external components can be avoided, and the electromagnetic interference suppression effect is good.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts. In the drawings:

fig. 1 is a schematic structural diagram of a common mode and differential mode integrated inductor according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of two configurations of a second core assembly;

FIG. 3 is a schematic diagram of a plurality of first magnetic cores nested inside and outside;

FIG. 4 is a schematic structural view of a plurality of first magnetic cores stacked one on top of the other;

FIG. 5 is a schematic diagram of an EMI test for a common mode and differential mode integrated inductor according to an embodiment of the present invention;

FIG. 6 is a schematic diagram illustrating a common mode interference current applied to a common mode inductance component according to an embodiment of the invention;

FIG. 7 is a diagram illustrating differential mode interference current after the differential mode interference current acts on the common mode inductor component according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of the coupling of a common mode inductor assembly and peripheral high frequency components;

FIG. 9 is a schematic diagram of the coupling between the common mode and differential mode integrated inductor and the peripheral high-frequency components in the embodiment of the invention;

FIG. 10 shows the test result of the common mode impedance of a common mode inductor;

fig. 11 is a test result of the common-mode impedance of the common-mode differential-mode integrated inductor according to the embodiment of the present invention;

FIG. 12 shows the test result of the differential mode inductance of the common mode inductance;

fig. 13 is a test result of differential mode inductance of the common mode and differential mode integrated inductor according to the embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention are further described in detail below with reference to the accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention.

Fig. 1 is a schematic structural diagram of a common mode and differential mode integrated inductor in an embodiment of the present invention, and as shown in fig. 1, the common mode and differential mode integrated inductor includes:

a common mode inductance component 105 and a differential mode inductance component 108, wherein,

the common mode inductance assembly 105 includes at least one first magnetic core 103, a first set of windings 100 and a second set of windings 101;

differential mode inductance assembly 108 includes at least one second magnetic core 104;

the common mode inductance component 105 is embedded in the differential mode inductance component 108 and is located in the middle of the at least one second magnetic core 104;

the first and second groups of winding wires 100 and 101 are simultaneously wound on at least one first magnetic core 103 in a positive coupling manner.

In the embodiment of the invention, the first group of windings and the second group of windings are simultaneously wound on at least one first magnetic core in a positive coupling mode, so that the at least one first magnetic core can be integrated together, the differential mode inductance component comprises at least one second magnetic core, the common mode inductance component is embedded in the differential mode inductance component and positioned in the middle of the at least one second magnetic core, and the first magnetic core and the at least one second magnetic core can be integrated, so that the common mode and differential mode integrated inductor has small overall volume and low cost, the common mode inductance component is embedded in the differential mode inductance component, the coupling with other external components can be avoided, and the electromagnetic interference suppression effect is good.

In one embodiment, the differential mode inductance assembly 108 further comprises a stub 106, a shoe 107 connecting the stub 106 and the at least one second magnetic core 104, wherein,

at least one second magnetic core 104 is respectively arranged around the center posts 106;

the at least one second magnetic core 104 is spaced a set distance from the center leg 106.