WO2020119589A1

WO2020119589A1 - Electronic apparatus, and filter inductor for same

Info

Publication number: WO2020119589A1
Application number: PCT/CN2019/123503
Authority: WO
Inventors: 沈唐兵; 李双佳; 单亮
Original assignee: 西门子电动汽车动力总成系统(上海)有限公司
Priority date: 2018-12-10
Filing date: 2019-12-06
Publication date: 2020-06-18
Also published as: CN111292930A; CN111292930B

Abstract

An electronic apparatus and a filter inductor (200). The filter inductor can be installed at an input terminal of an electronic apparatus. The filter inductor (200) comprises multiple magnetic cores and at least one conductive member. The multiple magnetic cores comprise a first magnetic core (22) and a second magnetic core (55), wherein the at least one conductive member is embedded within the first magnetic core (22). The second magnetic core (55) has a hollow portion for accommodating the first magnetic core (22), wherein the first magnetic core (22) is formed by a first magnetic material, the second magnetic core (55) is formed by a second magnetic material, and the second magnetic material is different from the first magnetic material.

Description

Electronic equipment and its filter inductor

Technical field

The present invention relates to an electronic device, and in particular to a filter inductor of an electronic device.

Background technique

A high-power power system usually includes a high-power power module, such as a converter module or an inverter module. This type of power module is usually unable to meet the International Special Committee on Radio Interference (CISPR, originally known as Comité International Spearcial Perturbations Radioélectriques) in the full frequency range or at least some frequency ranges. Regulatory standards and other standards, especially in the frequency range and/or a high-frequency range required by the drive system of an electric vehicle (EV) or hybrid electric vehicle (HEV). Therefore, a plurality of filter inductors each using a different magnetic material needs to be provided at the input end of such a high-power power module to filter out common-mode (CM) and differential mode (CM) in the full frequency range Differential-mode (DM for short) noise and elimination of electromagnetic interference.

FIG. 1 is a schematic diagram of all aspects of a filter inductor 100 in the prior art. The filter inductor 100 is disposed at the input end of a high-power power module in a high-power power system. The filter inductor 100 includes a housing 41, a magnetic core 26, two positive and negative busbars 11, a central column 202, a side column 201, a central gap 65, and at least one side gap. The two bus bars 11 are embedded in the magnetic core 26 and divide the magnetic core 26 into a central post 202 and a side post 201. The center post 202 is located between the two bus bars 11, and the rest of the magnetic core 26 is the side post 201. The central air gap 45 and the at least one side air gap are located in the center post 202 and the side post 201, respectively, so that the one shown in FIG. 1 is formed, and the cut surface of the filter inductor 100 seems to be an H-shaped structure . In order to facilitate the formation of the above structure and component assembly, the magnetic core 26 is composed of a plurality of independent

magnetic blocks

26a, 26b. The assembly method is to use an adhesive layer 33 to bond the

magnetic blocks

26a, 26b together. The material of the adhesive layer 33 may be a single-liquid type epoxy resin adhesive (EPORITE 2089).

The housing 41 is used to accommodate the magnetic core 26 and the bus bar 11. Therefore, the design of the volume and shape of the housing 41 must match the respective volume and shape of the magnetic core 26 and the two bus bars 11. In addition, in order to facilitate component assembly, the housing 41 may be composed of multiple housing components, such as an upper half housing 41a and a lower half housing 41b in this embodiment.

The material of the magnetic core 26 is a magnetic material, which can be selected from one of the following soft magnetic materials: ferrite, amorphous soft magnetic material, and iron powder. If the material of the magnetic core 26 is MnZn ferrite, because of its high magnetic permeability, it is only suitable for a low frequency range (for example, between 1K and 30M Hz), the filter inductor 100 can only Used to attenuate common mode and differential mode noise in this low frequency range. Conversely, if NiZn ferrite is used as the material of the magnetic core 26, due to its high impedance in a high frequency range (eg, between 30M and 1000M Hz), the filter inductance The device 100 can only be used to attenuate common-mode and differential-mode noise in this high-frequency range and eliminate electromagnetic interference.

Therefore, it is known that in order to eliminate the common mode and differential mode noise and electromagnetic interference in a full frequency range (that is, covering the low frequency range and the high frequency range described above), it is impossible to rely on a single prior art filter inductor alone. Implemented, and a plurality of filter inductors each using different magnetic materials must be provided at the input end of the high-power power module; in addition, the plurality of filter inductors respectively occupy a certain space inside the high-power power module, so that In terms of product design and planning, the overall volume of the high-power power module cannot be reduced.

Summary of the invention

The purpose of the present invention is to solve the above technical problem, and to provide a filter inductor with multiple magnetic cores for eliminating noise and electromagnetic interference in a full frequency range.

To achieve the above objectives, the present invention adopts the following technical solutions:

A filter inductor can be installed at an input end of an electronic device power module; the filter inductor includes a plurality of magnetic cores and at least one conductor, the plurality of magnetic cores includes a first magnetic core and a first Two magnetic cores, wherein the at least one conductor is embedded in the first magnetic core; the second magnetic core has a hollow portion for accommodating the first magnetic core, wherein the first magnetic core is composed of a first magnetic material , And the second magnetic core is composed of a second magnetic material, the second magnetic material is different from the first magnetic material.

Furthermore, both the first magnetic material and the second magnetic material can be selected from the following soft magnetic materials: ferrite, amorphous soft magnetic material, and iron powder.

Further, the first magnetic material can eliminate noise and electromagnetic interference in a first frequency range, and the second magnetic material can eliminate noise and electromagnetic interference in a second frequency range, the second frequency range is different from the The first frequency range.

Further, the union of the first frequency range and the second frequency range covers a full frequency range, and the full frequency range is between 1K Hz and 1000M Hz.

Further, one of the first magnetic material and the second magnetic material is nickel-zinc ferrite, and the other is manganese-zinc ferrite.

Further, the filter inductor further includes a housing for accommodating the plurality of magnetic cores.

Further, the filter inductor further includes a first fastening device, and the first fastening device is used to fix at least one magnetic core of the plurality of magnetic cores.

Further, the first fastening device includes at least one first rib, and at least one first groove opposite to the at least one first rib, wherein the at least one first rib is disposed on at least one inner wall of the housing, and The at least one first groove provided on the surface of the second magnetic core corresponds to; or the at least one first groove is provided on at least one inner wall of the housing and is in contact with the at least one first groove provided on the surface of the second magnetic core A first rib corresponds.

Further, the filter inductor further includes at least one conductor channel, the at least one conductor channel is formed inside the first magnetic core for passing the at least one conductor.

Further, the filter inductor further includes a second fastening device, and the second fastening device is used to fix at least one of the plurality of magnetic cores.

Further, the second fastening device includes at least one second rib, and at least one second groove opposite to the at least one second rib, wherein the at least one second rib is disposed on at least one outer wall of the at least one conductor channel And correspond to the at least one second groove provided on the surface of the portion where the first magnetic core contacts the at least one conductor channel; or at least one outer wall of the at least one conductor channel disposed in the at least one second groove And correspond to the at least one second rib provided on the surface of the portion where the first magnetic core is in contact with the at least one conductor channel.

Further, at least one of the first magnetic core and the second magnetic core is composed of a plurality of independent magnetic blocks, and the composition method is to use an adhesive layer to adhere the plurality of magnetic blocks to together.

Further, the filter inductor includes two conductors, the two conductors include two positive and negative bus bars, and the at least one conductor channel includes two conductor channels.

Further, the first magnetic core includes a central post and a side post, and the central post is located between the two conductor channels.

Further, the filter inductor includes at least one central gap, and the at least one central gap is located in the central column.

The invention also relates to an electronic device, including the above-mentioned filter inductor.

Further, the electronic device is an inverter.

BRIEF DESCRIPTION

FIG. 1 is a schematic diagram of all aspects of a filter inductor 100 in the prior art.

2a, 2b and 2c are each a schematic cross-sectional view of a first embodiment of a filter inductor 200 of the present invention.

3a and 3b are each a schematic cross-sectional view of a second embodiment of the filter inductor 200 of the present invention.

4a and 4b are each a schematic cross-sectional view of a third embodiment of the filter inductor 200 of the present invention.

5a and 5b are each a schematic cross-sectional view of a fourth embodiment of the filter inductor 200 of the present invention.

detailed description

The essential features and advantages of the present invention will be described in detail below in conjunction with the drawings and embodiments, but the present invention is not limited to the listed embodiments.

2a, 2b and 2c are each a schematic cross-sectional view of a first embodiment of a filter inductor 200 of the present invention. The filter inductor 200 is disposed in an electronic device, such as an input terminal of a high-power power module of a high-power power system, and has a plurality of magnetic cores to eliminate noise and electromagnetic interference in a full frequency range. At least two of the plurality of magnetic cores are made of magnetic materials different from each other. Preferably, the electronic device is an inverter.

In this embodiment, the plurality of magnetic cores of the filter inductor 200 includes a first magnetic core 22 and a second magnetic core 55, and the second magnetic core 55 has a hollow portion, which is used to accommodate the first Magnetic core 22. In another embodiment (not shown), the filter inductor 200 has three magnetic cores, and includes a first magnetic core, a second magnetic core, and an outermost third magnetic core from the inside to the outside. Both the second magnetic core and the third magnetic core have a hollow portion for accommodating the first magnetic core and the second magnetic core, respectively. The present invention is not limited to the number of the plurality of magnetic cores.

Further, the filter inductor 200 further includes a housing 44 (as shown in FIG. 2c), at least one conductor channel 101, at least one conductor, a central post 202, at least one central gap 65, one side post 201 and at least one side Void. The at least one conductor channel 101 is formed (also can be said to be embedded) inside the first magnetic core 22 for passing the at least one conductor. In this embodiment, the at least one conductor includes two bus bars that are positive and negative, and the two conductor channels 101 of the filter inductor 200 are used to pass the two bus bars.

As for the housing 44, its material may be a plastic. The housing 44 is used to accommodate the plurality of magnetic cores (such as the first magnetic core 22 and the second magnetic core 55 in this embodiment), and is provided with the at least one conductor channel 101. The design of the volume and shape of the housing 44 must match the volume and shape of the plurality of magnetic cores and the at least one conductor channel 101. In an embodiment, the structure of the housing 44 may be the housing 41 of the filter inductor 100 of FIG. 1, which may be composed of multiple housing parts, such as the upper half housing 41 a and the lower half housing 41 b; however, the present invention It is not limited to the implementation of the housing 44 (such as material, structure, size and shape, etc.).

The two conductor channels 101 of the filter inductor 200 divide the first magnetic core 22 into a central column 202 and a side column 201. The center column 202 is located between the two conductor channels 101, and the remaining part is the side column 201. The at least one central gap 65 and the at least one side gap are respectively located in the center pillar 202 and the side pillar 201, and are usually located in the middle of the center pillar 202 and the side pillar 201, respectively, thus forming a shape as shown in FIG. 2a One, viewed from the section of the filter inductor 200, is an approximately H-shaped structure. The at least one central gap 65 can be used to accommodate another component of the filter inductor 200, such as a sensor. In addition, in another embodiment (not shown), the filter inductor 200 has a plurality of central voids 65 located in the central pillar 202. Further, in other embodiments (not shown), the filter inductor 200 does not have the above-mentioned side gaps or has multiple side gaps. This embodiment is not limited to the number of the at least one central gap 65 and the at least one side gap.

Further, in order to facilitate the formation of the above structure and component assembly, the first magnetic core 22 is composed of a plurality of independent first

magnetic blocks

22a, 22b, and the assembly method is to use an adhesive layer 33 to combine the plurality of first The

magnetic blocks

22a and 22b are bonded together to form a square with a length, width, and thickness of 90 mm, 60 mm, and 50 mm, as shown in FIG. 2a. The material of the adhesive layer 33 may be a single-liquid type epoxy resin adhesive (EPORITE 2089). In addition, although the first magnetic core 22 in this embodiment is composed of two first

magnetic blocks

22a, 22b, the present invention is not limited to the number of multiple first magnetic blocks; In another embodiment (as the third embodiment will be described later), the first magnetic core 22 may be an integrally formed magnetic core block without any adhesive layer.

The second magnetic core 55 may be an integrally formed block having a hollow portion for receiving the first magnetic core 22 therein, as shown in FIGS. 2a and 2b. Therefore, the shape and volume of the hollow portion of the second magnetic core 55 are determined by the shape and volume of the first magnetic core 22. Furthermore, the size and shape of the first magnetic core 22 and the second magnetic core 55 must be determined in accordance with the design details of the filter inductor 200 regarding the shape or volume. In this embodiment, the shapes of the first magnetic core 22 and the second magnetic core 55, and the shape of the hollow portion of the second magnetic core 55 are all a square; however, the invention is not limited to the first magnetic core 22 and the second The size and shape of the magnetic core 55.

The first magnetic core 22 is composed of a first magnetic material, and the second magnetic core 55 is composed of a second magnetic material, and the second magnetic material is different from the first magnetic material. In addition, when selecting the first magnetic material and the second magnetic material, it is necessary to consider whether the two materials can be at a certain frequency for the effect of eliminating common mode and/or differential mode noise and electromagnetic interference Good results are achieved within the range; that is, the first magnetic material and the second magnetic material are selected to effectively eliminate noise and electromagnetic interference in a first frequency range and a second frequency range, respectively And the first frequency range is different from the second frequency range; preferably, the union of the first frequency range and the second frequency range is a full frequency range between 1K Hz and 1000M Hz.

As for the above-mentioned embodiment with three magnetic cores (not shown), the three magnetic cores are each composed of different magnetic materials, each of which can effectively eliminate noise and electromagnetic interference in three frequency ranges , And the union of the three frequency ranges is the full frequency range. In this way, the filter inductor 200 can eliminate common mode and/or differential mode noise and electromagnetic interference in the full frequency range.

The respective magnetic materials of the plurality of magnetic cores, such as the first magnetic material of the first magnetic core 22 and the second magnetic material of the second magnetic core 55, can be selected from the following soft magnetic materials: ferrite Ferrite, amorphous soft magnetic, iron powder, etc. In this embodiment, the first magnetic material is NiZn ferrite, due to its high impedance in the first frequency range (eg, a high frequency range between 1K and 30M Hz) Characteristics, the first magnetic core 22 can effectively attenuate common mode and/or differential mode noise in the first frequency range and provide a good effect of eliminating electromagnetic interference; the second magnetic material is manganese zinc ferrite MnZn ferrite, due to its high conductivity in the second frequency range (for example, a low frequency range between 30M and 1000M Hz), the second magnetic core 55 can be in the second frequency range Noise is effectively attenuated within.

In this way, using the characteristics of the different magnetic materials of the first magnetic core 22 and the second magnetic core 55 in the high frequency range and the low frequency range, a single filter inductor 200 can achieve the full frequency range (ie Including the above requirements for eliminating noise and electromagnetic interference in the first frequency range and the second frequency range).

Preferably, the filter inductor 200 further includes a first fastening device and/or a second fastening device for fixing at least one magnetic core of the plurality of magnetic cores. In the present embodiment shown in FIG. 2c, the filter inductor 200 includes the first fastening device and the second fastening device for fixing the second magnetic core 55 and the first magnetic core 22, respectively, and thus can The electromagnetic interference between the first magnetic core 22 and the second magnetic core 55 is avoided.

Further, as shown in FIG. 2c, the first fastening device includes at least one first rib 81, and at least one first groove opposite to the at least one first rib 81; the at least one first rib 81 is disposed on the housing At least one inner wall of 44 corresponds to the at least one first groove provided on the surface of the second magnetic core 55. The second fastening device includes at least one second rib 82 and at least one second groove opposite to the at least one second rib 82; the at least one second rib 82 is disposed on at least one outer wall of the at least one conductor channel 101 , And corresponds to the at least one second groove provided on the surface of the portion where the first magnetic core 22 contacts the at least one conductor channel 101.

In another embodiment (not shown), the positions of the above-mentioned ribs and grooves are reversed, that is to say, at least one first groove included in the first fastening device is disposed on at least one inner wall of the housing 44, and Corresponding to at least one first rib 81 provided on the surface of the second magnetic core 55; at least one second groove included in the second fastening device is provided on at least one outer wall of the at least one conductor channel 101 and is provided with At least one second rib 82 corresponds to the surface of the portion where the first magnetic core 22 contacts the at least one conductor channel 101.

3a and 3b, 4a and 4b, and 5a and 5b are schematic cross-sectional views of the second, third, and fourth embodiments of the filter inductor 200 of the present invention, respectively. The second, third, and fourth embodiments have components with the same name and the same number as in the first embodiment. The functions of these components are similar or the same. They have been explained in the above description of the first embodiment, so they are not Repeat again.

The difference between the second embodiment and the first embodiment lies in the shapes of the first magnetic core 22 and the second magnetic core 55. The shapes of the first magnetic core 22 and the second magnetic core 55 of the second embodiment, and the shape of the hollow portion of the second magnetic core 55 are both a cylindrical shape, and the shape of the first embodiment is a square shape different. In other embodiments (not shown), the hollow portions of the first magnetic core 22, the second magnetic core 55, and the second magnetic core may be an elliptical cylinder or a triangular cylinder.

The shapes of the first magnetic core 22 in the third embodiment and the first embodiment are the same and are all a square, and the difference lies in whether the first magnetic core 22 is integrally formed. The first magnetic core 22 of the third embodiment is an integrally formed magnetic core block, and the first magnetic core 22 of the first embodiment is to bond a plurality of separated first

magnetic blocks

22a, 22b by using an adhesive layer 33 And composed.

The shapes of the second magnetic core 55 of the fourth embodiment and the first embodiment are the same, and they are both a block with a hollow portion, and the hollow portion is used to accommodate the first magnetic core 22. The difference between the fourth embodiment and the first embodiment is that the second magnetic core 55 of the fourth embodiment includes a plurality of independent second

magnetic blocks

55a, 55b, and the second

magnetic block

55a, 55b is bonded, however, the second magnetic core 55 of the first embodiment is an integrally formed core block, and it is not necessary to use any adhesive layer for bonding. Therefore, although the second magnetic core 55 in the fourth embodiment is composed of two second

magnetic blocks

55a, 55b, the present invention is not limited to the number of the plurality of second magnetic blocks 55.

Compared with the prior art, the prior art needs to install a plurality of filter inductors on the input end of a high-power power module to eliminate noise and electromagnetic interference in the full frequency range. However, the advantage of the present invention is that it only needs to be installed A filter inductor of the present invention can achieve the above-mentioned effects; on the other hand, precisely because a high-power power module no longer needs to have multiple filter inductors, the filter inductor of the present invention can reduce the high-power power supply The manufacturing cost of the module and the high-power power system to which it belongs, and can reduce the volume of the high-power power module, and its power density is higher.

The above is only the preferred embodiment of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principles of the present invention, several improvements and retouches can be made. These improvements and retouches also It should be regarded as the protection scope of the present invention.

Claims

A filter inductor (200) can be installed at an input end of an electronic device; the filter inductor (200) includes a first magnetic core (22) and at least one conductor, and the at least one conductor is disposed on the In the first magnetic core (22); the filter inductor (200) is characterized by comprising:

-A plurality of magnetic cores, at least including the first magnetic core (22) and the second magnetic core (55), the second magnetic core (55) has a hollow portion for accommodating the first magnetic core Core (22), wherein the first magnetic core (22) is composed of a first magnetic material, and the second magnetic core (55) is composed of a second magnetic material, the second magnetic material is different from the The first magnetic material is described.
The filter inductor (200) according to claim 1, wherein the first magnetic material and the second magnetic magnetic material can be selected from the following soft magnetic materials: ferrite, Amorphous soft magnetic and iron powder.
The filter inductor (200) according to claim 2, wherein the first magnetic material can eliminate noise and electromagnetic interference in the first frequency range, and the second magnetic material can be in the second frequency range To eliminate noise and electromagnetic interference, the second frequency range is different from the first frequency range.
The filter inductor (200) according to claim 3, wherein the union of the first frequency range and the second frequency range covers a full frequency range, and the full frequency range is between 1K Hz and 1000M Hz.
The filter inductor (200) according to claim 1, wherein one of the first magnetic material and the second magnetic material is nickel zinc ferrite, and the other is manganese zinc ferrite .
The filter inductor (200) according to claim 1, wherein the filter inductor (200) further includes a housing (44) for accommodating the plurality of magnetic cores.
The filter inductor (200) according to claim 6, wherein the filter inductor (200) further includes a first fastening device, and the first fastening device is used to fix the plurality of magnetic cores At least one magnetic core (55).
The filter inductor (200) according to claim 7, wherein the first fastening device includes at least one first rib (81), and at least one opposite to the at least one first rib (81) A first slot, in which:

-The at least one first rib (81) is provided on at least one inner wall of the housing (44) and corresponds to the at least one first groove provided on the surface of the second magnetic core (55); or

-The at least one first groove is provided on at least one inner wall of the casing (44) and corresponds to the at least one first rib (81) provided on the surface of the second magnetic core (55).
The filter inductor (200) according to claim 1, wherein the filter inductor (200) further includes at least one conductor channel (101), the at least one conductor channel (101) is formed in the first The inside of a magnetic core (22) is used for passing the at least one conductor.
The filter inductor (200) according to claim 9, wherein the filter inductor (200) further includes a second fastening device, and the second fastening device is used to fix the plurality of magnetic cores At least one magnetic core (22).
The filter inductor (200) according to claim 10, wherein the second fastening device includes at least one second rib (82), and at least one opposite to the at least one second rib (82) One second slot, where:

-The at least one second rib (82) is disposed on at least one outer wall of the at least one conductor channel (101), and is disposed on the first magnetic core (22) and the at least one conductor channel (101) The at least one second groove on the surface of the contacting portion corresponds; or

-The at least one second slot is provided on at least one outer wall of the at least one conductor channel (101) and is in contact with the portion provided on the first magnetic core (22) and the at least one conductor channel (101) The at least one second rib (82) of the surface corresponds to.
The filter inductor (200) according to claim 1, wherein at least one of the first magnetic core (22) and the second magnetic core (55) is composed of a plurality of independent magnetic The block is composed of a plurality of magnetic blocks by using an adhesive layer (33).
The filter inductor (200) according to claim 9, wherein the filter inductor (200) includes two conductors, and the two conductors include two bus bars each positive and negative, the at least one The conductor channel includes two conductor channels (101).
The filter inductor (200) according to claim 13, wherein the first magnetic core (22) includes a central post (202) and a side post (201), the central post (202) is located at the Between two conductor channels (101).
The filter inductor (200) according to claim 14, wherein the filter inductor (200) includes at least one central gap (65), and the at least one central gap (65) is located in the central column (65) 202).
An electronic device characterized by comprising the filter inductor (200) according to any one of claims 1 to 15.
[Correction 17.02.2020 according to Rule 91]
The electronic device according to claim 16, wherein the electronic device is an inverter.