CN218447505U - Filter inductor and filter circuit - Google Patents
Filter inductor and filter circuit Download PDFInfo
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- CN218447505U CN218447505U CN202222917938.2U CN202222917938U CN218447505U CN 218447505 U CN218447505 U CN 218447505U CN 202222917938 U CN202222917938 U CN 202222917938U CN 218447505 U CN218447505 U CN 218447505U
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Abstract
The application provides a filter inductor and a filter circuit, and relates to the technical field of inductors. The filter inductor comprises a winding framework, a first main road magnetic core, a second main road magnetic core, a shunt magnetizer, a first winding and a second winding, wherein the winding framework comprises a first winding area, an isolation area and a second winding area, and the isolation area is positioned between the first winding area and the second winding area and isolates the first winding area from the second winding area; the first winding is arranged in the first winding area in a surrounding mode, the second winding is arranged in the second winding area in a surrounding mode, and the shunt magnetizer is arranged in the isolation area; the first main road magnetic core and the second main road magnetic core are wound outside the winding framework, the first winding and the second winding, and the first main road magnetic core is connected with the second main road magnetic core and is positioned on the side surface of the winding framework; the first winding and the second winding have the same wire diameter, the same number of turns and the same winding direction; the filter inductor is used for filtering common mode noise and differential mode noise. The application has the advantages of small volume and low cost.
Description
Technical Field
The application relates to the technical field of inductors, in particular to a filter inductor and a filter circuit.
Background
The differential mode inductor and the common mode inductor are EMI (Electromagnetic Interference) devices commonly used in electronic circuits, and are usually manufactured, installed and used as two independent devices respectively.
At present, a common mode inductor is formed by respectively winding two same coils on a closed magnetic core by using enameled wires, and common mode noise interference in a circuit is filtered or suppressed by using a common mode inductance generated by the common mode inductor; in addition, a single-coil inductor (i.e., a differential mode inductor) is used to filter or suppress the differential mode noise interference in the circuit.
Therefore, in the electromagnetic interference device provided at present, a common mode inductor and a differential mode inductor need to be arranged independently, the cost of the magnetic core is high, and the overall size is large.
SUMMERY OF THE UTILITY MODEL
The application aims to provide a filter inductor and a filter circuit, and aims to solve the problems that in the prior art, when common mode noise and differential mode noise need to be filtered, the overall size of the filter inductor is large and the cost is high.
In order to achieve the above purpose, the embodiments of the present application employ the following technical solutions:
in one aspect, an embodiment of the present application provides a filter inductor, where the filter inductor includes a bobbin, a first main magnetic core, a second main magnetic core, a shunt magnetizer, a first winding, and a second winding, where the bobbin includes a first winding region, an isolation region, and a second winding region, and the isolation region is located between the first winding region and the second winding region and isolates the first winding region from the second winding region; the first winding is arranged in the first winding area in a surrounding mode, the second winding is arranged in the second winding area in a surrounding mode, and the shunt magnetizer is installed in the isolation area; the first main magnetic core and the second main magnetic core are wound outside the bobbin, the first winding and the second winding, and the first main magnetic core is connected with the second main magnetic core and positioned on the side surface of the bobbin; wherein the content of the first and second substances,
the first winding and the second winding have the same wire diameter, the same number of turns and the same winding direction;
the filter inductor is used for filtering common mode noise and differential mode noise.
Optionally, the first main magnetic core and the second main magnetic core are both configured to be U-shaped, two end faces of the first main magnetic core and the second main magnetic core are attached to each other, and the shunt magnetizer is configured to be I-shaped.
Optionally, the cross sections of the first main magnetic core and the second main magnetic core are rectangular, and the cross sections of the first main magnetic core and the second main magnetic core are equal.
Optionally, the isolation region is provided with an accommodation groove, and the shunt magnetizer is installed in the accommodation groove.
Gaps are arranged between the accommodating groove and the first main circuit magnetic core and between the accommodating groove and the second main circuit magnetic core, the shunt magnetizer is composed of at least one shunt magnetizer piece, and the leakage inductance of the filter inductor is related to the gaps and the number of the shunt magnetizer pieces.
Optionally, the winding framework comprises an insulating cylinder and a plurality of insulating plates sleeved on the outer wall of the insulating cylinder, and the insulating plates are arranged at intervals to form a first winding area, an isolation area and a second winding area.
Optionally, the end of the winding frame is provided with a lead terminal seat body, the lead terminal seat body is provided with a lead pin, and the lead pin is used for externally connecting a lead.
Optionally, the filter inductor further includes a core clamp spring, and two end portions of the core clamp spring are respectively clamped with the first main magnetic core and the second main magnetic core.
Optionally, the shunt magnetizer comprises a ferrite core or a silicon steel sheet magnetizer.
On the other hand, the embodiment of the present application further provides a filter circuit, where the filter circuit includes the above filter inductor.
Compared with the prior art, the method has the following beneficial effects:
the application provides a filter inductor and a filter circuit, wherein the filter inductor comprises a winding framework, a first main path magnetic core, a second main path magnetic core, a shunt magnetizer, a first winding and a second winding, the winding framework comprises a first winding area, an isolation area and a second winding area, and the isolation area is positioned between the first winding area and the second winding area and isolates the first winding area from the second winding area; the first winding is arranged in the first winding area in a surrounding mode, the second winding is arranged in the second winding area in a surrounding mode, and the shunt magnetizer is arranged in the isolation area; the first main road magnetic core and the second main road magnetic core are wound outside the winding framework, the first winding and the second winding, and the first main road magnetic core is connected with the second main road magnetic core and is positioned on the side surface of the winding framework; the first winding and the second winding have the same wire diameter, the same number of turns and the same winding direction; the filter inductor is used for filtering common mode noise and differential mode noise. Because the filter inductor that this application provided can pass through a component and simultaneously filter common mode noise and differential mode noise, consequently can realize the miniaturization of component, save the cost simultaneously, promote the degree of freedom of circuit design.
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and it will be apparent to those skilled in the art that other related drawings can be obtained from the drawings without inventive effort.
Fig. 1 is an exploded schematic view of a filter inductor according to an embodiment of the present disclosure.
Fig. 2 is a schematic structural diagram of a filter inductor according to an embodiment of the present application.
Fig. 3 is a schematic diagram of the operation of the filter inductor according to the embodiment of the present invention when common mode signals with the same polarity and the same amplitude are applied.
Fig. 4 is a schematic diagram illustrating an operation of applying differential mode signals with opposite polarities and the same amplitude to the filter inductor according to the embodiment of the present application.
In the figure:
100-a filter inductor; 110-a winding framework; 120-a first main magnetic core; 130-a second main road magnetic core; 140-shunt magnetizers; 150-a magnetic core clamp spring; 160-a thread guide needle; 111-a first winding area; 112-an isolation region; 113-a second winding area; 114-an insulating cylinder; 115-insulating plate.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, as presented in the figures, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.
In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
The nature of the differential mode noise is the signal difference between two signal lines; the nature of the differential mode noise is also referred to as ground noise, which means that two signal lines are respectively grounded. As described in the background art, when the common mode noise and the differential mode noise in the circuit need to be filtered, the common mode inductor and the differential mode inductor need to be separately arranged, resulting in high cost and large overall size of the circuit.
In view of the above, in order to solve the above problems, embodiments of the present application provide a filter inductor, which integrates a common mode inductor and a differential mode inductor into one inductor, so as to filter out common mode noise and differential mode noise simultaneously by using one filter inductor, thereby achieving the purposes of reducing cost and reducing volume.
The following is an exemplary illustration of the filter inductor provided in the present application:
as an implementation manner, please refer to fig. 1 and fig. 2, a filter inductor 100 according to an embodiment of the present application includes a bobbin 110, a first main magnetic core 120, a second main magnetic core 130, a shunt magnetizer 140, a first winding (not shown), and a second winding (not shown), where the bobbin 110 includes a first winding area 111, an isolation area 112, and a second winding area 113, the isolation area 112 is located between the first winding area 111 and the second winding area 113, and isolates the first winding area 111 from the second winding area 113; the first winding is arranged around the first winding area 111, the second winding is arranged around the second winding area 113, and the shunt magnetizer 140 is arranged in the isolation area 112; the first main magnetic core 120 and the second main magnetic core 130 surround the bobbin 110, the first winding and the second winding, and the first main magnetic core 120 is connected to the second main magnetic core 130 and located on the side of the bobbin 110; the first winding and the second winding have the same wire diameter, the same number of turns and the same winding direction; the filter inductor 100 is used to filter out common mode noise and differential mode noise.
In the filter inductor 100 provided by the present application, the leakage shunt is added between the two coil magnetic circuits of the common mode inductor, so that the leakage inductance of the common mode inductor can be increased, and thus the differential mode effect is formed, and therefore, the purposes of improving the component integration level and reducing the cost are achieved.
As an implementation manner, the bobbin 110 includes an insulating cylinder 114 and a plurality of insulating plates 115 sleeved on an outer wall of the insulating cylinder 114, and the insulating plates 115 are disposed at intervals to form a first winding region 111, an isolation region 112, and a second winding region 113.
On this basis, the first winding and the second winding are both sleeved on the insulating sleeve and are isolated from each other by the isolation region 112. In the isolation region 112, in order to facilitate the installation of the shunt magnetizer 140, a receiving groove is provided in the isolation region 112, and the shunt magnetizer 140 is installed in the receiving groove.
Compare in the inductor among the prior art, this application is owing to set up positioner such as holding tank on bobbin 110, and consequently its equipment is more convenient.
It should be noted that, a gap is provided between the accommodating groove and the first main magnetic core 120 and the second main magnetic core 130, and the shunt magnetic body 140 is composed of a plurality of shunt magnetic body pieces, for example, the number of shunt magnetic body pieces may be 1, 2, 3 or more, as shown in fig. 1, the shunt magnetic body 140 in this application is composed of 4 shunt magnetic body pieces. When the shunt magnetic conductor pieces are multiple, the shunt magnetic conductor pieces are connected in pairs to form a complete shunt magnetic conductor.
The leakage inductance of the filter inductor 100 is related to the number of the gaps and the shunt magnet pieces. Therefore, the size of the air gap between the shunt magnetizer 140 and the first and second main path magnetic cores 120 and 130 can be adjusted by controlling the size of the shunt magnetizer 140, so as to adjust the size of the leakage inductance; the size of the leakage inductance can also be adjusted by increasing or decreasing the number of the shunt magnetic conductor pieces. For example, 4 shunt magnet pieces may be adjusted to 5 shunt magnet pieces.
Wherein, the first main road core 120 and the second main road core 130 constitute a main magnetic core group. As an implementation manner, the first main magnetic core 120 and the second main magnetic core 130 are both configured to be U-shaped, and two end surfaces of the first main magnetic core 120 and the second main magnetic core 130 are attached to each other, and the shunt magnetizer 140 is configured to be I-shaped.
Alternatively, the first main magnetic core 120 and the second main magnetic core 130 are standard U-shaped magnetic cores, which have rectangular cross sections and equal cross-sectional areas. In order to ensure that the two end faces of the first main magnetic core 120 and the second main magnetic core 130 are attached more closely, the section of the first main magnetic core 120 in magnetic contact with the second main magnetic core may be mirror-processed, so that the section is smoother and can be attached more closely.
The materials of the first main magnetic core 120, the second main magnetic core 130, and the shunt magnetizer 140 are not limited in this application, for example, the shunt magnetizer 140 may be a ferrite magnetic core or a silicon steel sheet magnetizer.
In order to fix the first main path magnetic core 120 and the second main path magnetic core 130, the filter inductor 100 further includes a core clamp spring 150, two end portions of the core clamp spring 150 are respectively clamped with the first main path magnetic core 120 and the second main path magnetic core 130, and then the first main path magnetic core 120 and the second main path magnetic core 130 can be fixed by the core clamp spring 150 after being installed on the side surface of the bobbin 110, so as to prevent the first main path magnetic core 120 and the second main path magnetic core 130 from falling off.
Of course, in order to connect the filter inductor 100 to other components in the circuit, a lead terminal seat is disposed at an end of the bobbin 110, and a lead pin 160 is disposed on the lead terminal seat, and the lead pin 160 is used for externally connecting a lead.
The following provides a detailed description of the principles of the filter inductor provided in the present application:
fig. 3 shows an operation principle diagram when common mode signals with the same polarity and the same amplitude are added to the filter inductor according to the embodiment of the present application, wherein when the common mode signals with the same polarity and the same amplitude are added to the filter inductor, the magnetic fluxes Φ 1 and Φ 2 with the same phase are generated according to the right-hand spiral rule, and since the magnetic fluxes in the middle magnetic shunt cancel each other (i.e., Φ 1b- Φ 2b = 0), the magnetic resistance of the middle magnetic shunt is infinite, so that most of the magnetic fluxes pass through the main magnetic paths Φ 1a and Φ 2a, the total magnetic flux of the first winding (coil 1 in the drawing) is Φ 1+ Φ 2a, and the total magnetic flux of the second winding (coil 2 in the drawing) is Φ 2+ Φ 1a, so that a high common mode impedance is presented.
Fig. 4 shows an operation principle diagram when a filter inductor and a filter inductor of the embodiment of the present application add differential mode signals with opposite polarities and the same amplitude, and magnetic fluxes Φ 1 and Φ 2 to be generated to be reversed and a magnetic flux Φ 1b + Φ 2b in the magnetic shunt in the middle are cancelled according to the right-hand spiral law, and since Φ 1a and Φ 2a cancel each other, a magnetic flux passing through a first winding (coil 1 in the drawing) is Φ 1b, and a magnetic flux passing through a second winding (coil 2 in the drawing) is Φ 2b, an incremental differential mode impedance is additionally generated, and by adjusting the size of a shunt magnetizer or the size of a gap between the shunt magnetizer and the first main path magnetic core and the second main path magnetic core, the impedance of the magnetic shunt can be changed, so as to change the size of the differential mode impedance.
Compared with the prior art, the common-mode noise filtering device has the advantages that the first main circuit magnetic core, the second main circuit magnetic core, the first winding and the second winding are matched with each other to generate the effect of filtering common-mode noise; the first main path magnetic core, the second main path magnetic core, the shunt magnetizer, the first winding and the second winding are mutually matched to generate the effect of filtering differential mode noise; therefore, the common mode noise and the differential mode noise can be filtered simultaneously, and the efficiency of filtering the differential mode noise is improved. Meanwhile, the common-mode magnetic circuit keeps high magnetic conductivity, a larger common-mode inductance value is easy to obtain, and the main magnetic circuit iron core group and the magnetic shunt magnetizer are separated by an air gap, so that the differential-mode magnetic circuit keeps low magnetic conductivity and high anti-saturation capacity, and the magnetic core saturation caused by the direct current bias of the differential-mode loop is prevented. And the filter inductor is integrated into a single element, which is beneficial to element miniaturization, so that the wiring space can be saved, and the freedom degree of circuit design is improved.
In summary, the present application provides a filter inductor and a filter circuit, where the filter inductor includes a winding frame, a first main magnetic core, a second main magnetic core, a shunt magnetizer, a first winding, and a second winding, the winding frame includes a first winding area, an isolation area, and a second winding area, and the isolation area is located between the first winding area and the second winding area and isolates the first winding area from the second winding area; the first winding is arranged in the first winding area in a surrounding mode, the second winding is arranged in the second winding area in a surrounding mode, and the shunt magnetizer is arranged in the isolation area; the first main road magnetic core and the second main road magnetic core are wound outside the winding framework, the first winding and the second winding, and the first main road magnetic core is connected with the second main road magnetic core and is positioned on the side surface of the winding framework; the first winding and the second winding have the same wire diameter, the same number of turns and the same winding direction; the filter inductor is used for filtering common mode noise and differential mode noise. Because the filter inductor that this application provided can pass through an element and filter common mode noise and differential mode noise simultaneously, consequently can realize the miniaturization of component, save the cost simultaneously, promote the degree of freedom of circuit design.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.
It will be evident to those skilled in the art that the present application is not limited to the details of the foregoing illustrative embodiments, and that the present application may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (10)
1. A filter inductor is characterized by comprising a winding framework, a first main magnetic core, a second main magnetic core, a shunt magnetizer, a first winding and a second winding, wherein the winding framework comprises a first winding area, an isolation area and a second winding area, and the isolation area is positioned between the first winding area and the second winding area and isolates the first winding area from the second winding area; the first winding is arranged in the first winding area in a surrounding mode, the second winding is arranged in the second winding area in a surrounding mode, and the shunt magnetizer is installed in the isolation area; the first main magnetic core and the second main magnetic core are wound outside the bobbin, the first winding and the second winding, and the first main magnetic core is connected with the second main magnetic core and positioned on the side surface of the bobbin; wherein the content of the first and second substances,
the first winding and the second winding have the same wire diameter, the same number of turns and the same winding direction;
the filter inductor is used for filtering common mode noise and differential mode noise.
2. The filter inductor according to claim 1, wherein the first main magnetic core and the second main magnetic core are both configured as a U-shape, and two end surfaces of the first main magnetic core and the second main magnetic core are attached, and the shunt magnetizer is configured as an I-shape.
3. The filter inductor according to claim 2, wherein the first main magnetic core and the second main magnetic core have a rectangular cross section and have equal cross-sectional areas.
4. The filter inductor according to claim 1, wherein the isolation region is provided with an accommodation groove in which the shunt magnetic conductor is mounted.
5. The filter inductor according to claim 4, wherein a gap is provided between the receiving tank and the first and second main circuit cores, and the shunt magnet is composed of at least one shunt magnet piece, and a leakage inductance of the filter inductor is associated with the gap and the number of the shunt magnet pieces.
6. The filter inductor according to claim 1, wherein the bobbin includes an insulating cylinder and a plurality of insulating plates sleeved on an outer wall of the insulating cylinder, and the insulating plates are spaced apart from each other to form a first winding region, an isolation region, and a second winding region.
7. The filter inductor according to claim 1, wherein a lead terminal seat body is arranged at an end of the bobbin, and a lead pin is arranged on the lead terminal seat body and used for externally connecting a lead.
8. The filter inductor according to claim 1, further comprising a core clamp spring, both ends of the core clamp spring being respectively clamped with the first main path magnetic core and the second main path magnetic core.
9. The filter inductor according to claim 1, wherein the shunt magnetizer includes a ferrite core or a silicon steel sheet magnetizer.
10. A filter circuit, characterized in that it comprises a filter inductor according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222917938.2U CN218447505U (en) | 2022-11-01 | 2022-11-01 | Filter inductor and filter circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222917938.2U CN218447505U (en) | 2022-11-01 | 2022-11-01 | Filter inductor and filter circuit |
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| Publication Number | Publication Date |
|---|---|
| CN218447505U true CN218447505U (en) | 2023-02-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202222917938.2U Active CN218447505U (en) | 2022-11-01 | 2022-11-01 | Filter inductor and filter circuit |
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| Country | Link |
|---|---|
| CN (1) | CN218447505U (en) |
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- 2022-11-01 CN CN202222917938.2U patent/CN218447505U/en active Active
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