A common-differential mode integrated magnetic circuit integrated inductor

Abstract

The present application discloses a common differential mode integrated magnetic circuit inductor, comprising: a left magnetic core, a right magnetic core, an upper choke and a lower choke; the left and right ends of the upper choke and the lower choke are connected to the left magnetic core and the right magnetic core respectively; a coil with a preset number of turns is wound on the left magnetic core and the right magnetic core; a first preset gap is reserved between the left magnetic core and the right magnetic core, and a second preset gap is reserved between the upper choke and the lower choke; a first protrusion is arranged in the front-to-back direction of the upper choke, and a second protrusion is arranged in the front-to-back direction of the lower choke, and the protruding directions of the first protrusion and the second protrusion are the same; the ratio of the length of the left magnetic core and the right magnetic core to the length of the upper choke and the lower choke is 0.8 to 1.5. The present application solves the technical problems that the existing magnetic core inductor structure uses a U-shaped magnetic core and a low permeability I-shaped magnetic core to realize the magnetic integration of the common differential mode magnetic flux loop, and there are unsatisfactory electromagnetic interference suppression effect and the need to stretch the magnetic circuit length due to the existence of the middle column, which reduces the common mode inductance component.

Description

Technical Field

[0001] The present application relates to the technical field of magnetic core inductors, and in particular to a common-differential mode integrated magnetic circuit integrated inductor. Background Art

[0002] Inductors are components that convert electrical energy into magnetic energy and store it. They are widely used in electronic circuits, especially in switching power supply circuits. In switching power supply circuits, electromagnetic interference signals are inevitably generated due to the constant changes in circuit switches. These signals are mainly divided into two types: conduction and radiation. For the stability of the circuit, it is necessary to take measures to suppress these interference signals.

[0003] Optimizing the inductance design in a switching power supply circuit is an effective way to suppress electromagnetic interference in the circuit. In the prior art, a magnetic core inductor structure is designed, using a U-shaped magnetic core and an I-shaped magnetic core with low magnetic permeability to achieve magnetic integration of the common-differential mode flux loop. However, since the paths of the symmetrical winding differential mode flux loops are superimposed inside the middle column of the magnetic core, and the volume of the middle column is relatively small relative to the volume of the side columns, it is more likely that the core will be saturated, ultimately resulting in an unsatisfactory filtering effect. Furthermore, due to the presence of the middle column, in order to avoid space, the length of the magnetic circuit needs to be stretched, reducing the common-mode inductance component. Therefore, this magnetic core inductor structure in the prior art cannot suppress electromagnetic interference well, and technical personnel in this field still need to improve the optimization and improvement of the magnetic core inductor structure. Summary of the invention

[0004] The present application provides a common-differential mode integrated magnetic circuit integrated inductor, which is used to solve the technical problems that the existing magnetic core inductor structure uses a U-shaped magnetic core and a low magnetic permeability I-shaped magnetic core to achieve common-differential mode magnetic flux circuit magnetic integration, has the disadvantages of unsatisfactory electromagnetic interference suppression effect and the need to stretch the magnetic circuit length due to the presence of a middle column, thereby reducing the common-mode inductance component.

[0005] The present application provides a common-differential mode integrated magnetic circuit integrated inductor, comprising: a left magnetic core, a right magnetic core, an upper choke portion and a lower choke portion;

[0006] The left and right ends of the upper choke portion and the lower choke portion are connected to the left magnetic core and the right magnetic core respectively;

[0007] The left magnetic core and the right magnetic core are wound with coils having a preset number of turns;

[0008] A first preset gap is reserved between the left magnetic core and the right magnetic core, and a second preset gap is reserved between the upper choke portion and the lower choke portion;

[0009] The upper choke portion is provided with a first protrusion in the front-to-back direction, and the lower choke portion is provided with a second protrusion in the front-to-back direction, and the first protrusion and the second protrusion have the same protruding direction;

[0010] The ratio of the length of the left magnetic core and the right magnetic core to the length of the upper choke portion and the lower choke portion is 0.8 to 1.5.

[0011] Optionally, the ratio of the length of the left magnetic core and the right magnetic core to the length of the upper choke portion and the lower choke portion is 1.05.

[0012] Optionally, the lengths of the left magnetic core and the right magnetic core are 5 to 50 mm.

[0013] Optionally, the protruding lengths of the first protrusion and the second protrusion do not exceed the widths of the upper choke portion and the lower choke portion.

[0014] Optionally, the protruding length of the first protrusion and the second protrusion is not less than 1 mm.

[0015] Optionally, the left magnetic core and the right magnetic core are arranged to protrude from the upper choke portion or the lower choke portion in a vertical direction.

[0016] Optionally, the first protrusion and the second protrusion are respectively arranged at two ends of the upper choke portion and the lower choke portion.

[0017] Optionally, the coil of the left magnetic core and the coil of the right magnetic core are symmetrical windings.

[0018] Optionally, the first protrusion and the second protrusion are respectively arranged in the middle of the upper choke portion and the lower choke portion.

[0019] Optionally, the first protrusion and the second protrusion are square structures.

[0020] It can be seen from the above technical solutions that this application has the following advantages:

[0021] The present application provides a common-differential mode integrated magnetic circuit integrated inductor, comprising: a left magnetic core, a right magnetic core, an upper choke portion and a lower choke portion; the left and right ends of the upper choke portion and the lower choke portion are respectively connected to the left magnetic core and the right magnetic core; a coil with a preset number of turns is wound around the left magnetic core and the right magnetic core; a first preset gap is reserved between the left magnetic core and the right magnetic core, and a second preset gap is reserved between the upper choke portion and the lower choke portion; a first protrusion is arranged in the front-to-back direction of the upper choke portion, and a second protrusion is arranged in the front-to-back direction of the lower choke portion, and the protruding directions of the first protrusion and the second protrusion are the same; the ratio of the length of the left magnetic core and the right magnetic core to the length of the upper choke portion and the lower choke portion is 0.8 to 1.5. The common-differential mode integrated magnetic circuit integrated inductor provided by the present application adopts a closed composite magnetic core structure design. The closed composite magnetic core forms a "C"-shaped differential mode interference suppression flux circuit through the raised parts of the upper and lower chokes and the left and right magnetic cores. The closed "mouth"-shaped common-mode interference suppression flux circuit formed by the upper and lower chokes and the left and right magnetic cores are independent of each other. The ratio of the length of the left and right magnetic cores to the length of the upper and lower chokes is controlled within 0.8 to 1.5, which can better control the magnetic circuit length of the common-mode component in the common-differential mode integrated magnetic core to ensure the common mode The inductance of the component is moderate, which effectively suppresses common-differential mode interference; the common-differential mode is integrated into one, the volume is reduced, and the middle column extrusion is reduced, the voltage resistance safety between the space coils is higher, and while reducing the cost, it is also conducive to promoting automated production, and solves the existing core inductance structure that uses a U-shaped core and a low-permeability I-shaped core to achieve common-differential mode flux circuit magnetic integration, has the problem of unsatisfactory electromagnetic interference suppression effect and the need to stretch the magnetic circuit length due to the presence of the middle column, thereby reducing the technical problems of the common-mode inductance component. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0023] Figure 1 It is a left view of a structure of a common-differential mode integrated magnetic circuit integrated inductor provided in an embodiment of the present application;

[0024] Figure 2 for Figure 1 A front view of a common-differential mode integrated magnetic circuit integrated inductor structure;

[0025] Figure 3 for Figure 1 A top view of a common-differential mode integrated magnetic circuit integrated inductor structure;

[0026] Figure 4A front view of a second structure of a common-differential mode integrated magnetic circuit integrated inductor provided in an embodiment of the present application;

[0027] Figure 5 for Figure 4 A left view of a common-differential mode integrated magnetic circuit integrated inductor structure;

[0028] Figure 6 for Figure 4 A top view of a common-differential mode integrated magnetic circuit integrated inductor structure;

[0029] Figure 7 It is a front view of a third structure of a common-differential mode integrated magnetic circuit integrated inductor provided in the application embodiment;

[0030] Figure 8 for Figure 7 A left view of a common-differential mode integrated magnetic circuit integrated inductor structure;

[0031] Fig. 9 for Figure 7 A top view of a common-differential mode integrated magnetic circuit integrated inductor structure;

[0032] Fig.10 It is a front view of a fourth structure of a common-differential mode integrated magnetic circuit integrated inductor provided in the application embodiment;

[0033] Fig.11 for Fig.10 A left view of a common-differential mode integrated magnetic circuit integrated inductor structure;

[0034] Fig.12 for Fig.10 A top view of a common-differential mode integrated magnetic circuit integrated inductor structure;

[0035] Wherein, the accompanying drawings are marked as follows:

[0036] 1. Left magnetic core; 2. Right magnetic core; 3. Upper choke; 4. Lower choke; 5. Common-mode interference suppression flux loop; 6. Differential-mode interference suppression flux loop; 7. First protrusion; 8. Second protrusion. DETAILED DESCRIPTION

[0037] An embodiment of the present application discloses a common-differential mode integrated magnetic circuit integrated inductor, which is used to solve the technical problems that the existing magnetic core inductor structure uses a U-shaped magnetic core and an I-shaped magnetic core with low magnetic permeability to achieve common-differential mode magnetic flux circuit magnetic integration, has the disadvantages of unsatisfactory electromagnetic interference suppression effect and the need to stretch the magnetic circuit length due to the presence of a middle column, thereby reducing the common-mode inductance component.

[0038] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0039] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0040] Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0041] See also Figures 1 to 3 , the present application provides an embodiment of a common differential mode integrated magnetic circuit integrated inductor, comprising: a left magnetic core 1, a right magnetic core 2, an upper choke 3 and a lower choke 4;

[0042] The left and right ends of the upper choke portion 3 and the lower choke portion 4 are connected to the left magnetic core 1 and the right magnetic core 2 respectively;

[0043] The left magnetic core 1 and the right magnetic core 2 are wound with coils with a preset number of turns;

[0044] A first preset gap is reserved between the left magnetic core 1 and the right magnetic core 2, and a second preset gap is reserved between the upper choke portion and the lower choke portion;

[0045] A first protrusion 7 is provided in the front-to-back direction of the upper choke portion 3, and a second protrusion 8 is provided in the front-to-back direction of the lower choke portion 4. The first protrusion 7 and the second protrusion 8 have the same protruding direction;

[0046] The ratio of the length of the left magnetic core 1 and the right magnetic core 2 to the length of the upper choke portion 3 and the lower choke portion 4 is 0.8 to 1.5.

[0047] It should be noted that if Figure 1 and Figure 2 As shown, in the embodiment of the present application, the common-differential mode integrated magnetic circuit integrated inductor is designed as a closed composite magnetic core structure, and the left magnetic core 1 and the right magnetic core 2 can be square, elliptical or circular structures. The first protrusion 7 and the second protrusion 8 can be single-sided protrusions, that is, the first protrusion 7 and the second protrusion 8 are only arranged in the same front or the same rear, or they can be bilateral symmetrical protrusions, that is, the first protrusion 7 and the second protrusion 8 are arranged in the front and rear directions. In comparison, the bilateral symmetrical protrusions can make the differential mode inductance component larger and more suitable for products with high differential mode components. The left magnetic core 1 and the right magnetic core 2 can be made of high magnetic permeability materials, such as high magnetic permeability ferrite, which can maximize the inductance, reduce the number of coil turns, and improve the EMI filtering effect of the switching power supply circuit. In practical applications, considering the energy conversion problem, the left magnetic core 1 and the right magnetic core 2 can be made of low-conductivity ferrite or nickel-zinc ferrite or amorphous powder core or nanocrystalline material, so as to use magnetic integration to expand the application field of the conductive transformer from the common-differential mode integrated inductor, such as LLC topology network, and use the large leakage inductance as the resonant inductor and the resonant capacitor to participate in the resonance to achieve energy conversion. Through the closed composite magnetic core structure of the present application, the common-mode interference suppression flux loop 5 and the differential-mode interference suppression flux loop 6 can be made independent of each other. Since the raised columns of the upper and lower choke parts are not in the middle of the two windings, the differential-mode interference suppression flux loop 6 has a stronger anti-saturation ability than the existing magnetic core structure with a center column, and will not occupy the winding space position, reducing the risk of poor withstand voltage between windings. The closed "mouth" shape formed by the common-mode interference suppression flux loop 5, according to the calculation formula of the inductance, can ensure the minimum space required for left-right symmetrical winding, and by reducing the horizontal length of the upper and lower chokes, it is helpful to reduce the magnetic path length of the common-mode component, thereby increasing the common-mode component inductance, thereby avoiding the increase in the magnetic path length of the common-mode component due to the presence of the middle column, and reducing the defect of the common-mode component inductance. The raised parts of the upper and lower chokes, namely the first protrusion 7 and the second protrusion 8, and the left and right magnetic cores form a "C"-shaped differential-mode interference suppression flux loop. The first protrusion 7 and the second protrusion 8 just act as window limit columns for winding on the left-right symmetrical magnetic cores, preventing the wire body from loosening and locating the distance from the mounting base, which can greatly simplify the structural design of the base and save the base design cost. The first protrusion 7 and the second protrusion 8 also play a role in protecting the wire package, effectively preventing external devices from contacting or colliding with the wire package. In the process of studying technical issues, in order to effectively suppress differential mode interference, the length of the left core 1 and the right core 2 and the length of the upper choke 3 and the lower choke 4 need to be controlled within a ratio of 0.8 to 1.5. This can better control the magnetic path length of the common-mode component in the common-mode and differential-mode integrated core, ensure that the common-mode component inductance is moderate, and thus effectively suppress common-mode and differential-mode interference.

[0048] The common-differential mode integrated magnetic circuit integrated inductor provided in the embodiment of the present application adopts a closed composite magnetic core structure design. The closed composite magnetic core forms a "C"-shaped differential mode interference suppression flux circuit through the raised parts of the upper and lower chokes and the left and right magnetic cores. The closed "mouth"-shaped common mode interference suppression flux circuit formed by the upper and lower chokes and the left and right magnetic cores are independent of each other. The ratio of the length of the left and right magnetic cores to the length of the upper and lower chokes is controlled within 0.8 to 1.5, which can better control the magnetic circuit length of the common mode component in the common-differential mode integrated magnetic core, ensuring The common-mode component inductance is moderate, which effectively suppresses common-mode and differential-mode interference; the common-mode and differential-mode inductance are integrated into one, which reduces the volume and reduces the squeezing of the middle column. The voltage resistance safety between the space coils is higher, which reduces the cost and is conducive to promoting automated production. It solves the technical problems that the existing core inductor structure uses a U-shaped core and a low-permeability I-shaped core to achieve common-mode flux circuit magnetic integration, which has the problem of unsatisfactory electromagnetic interference suppression effect and the need to stretch the magnetic circuit length due to the presence of the middle column, thereby reducing the common-mode inductance component.

[0049] As a further improvement of the common differential mode integrated magnetic circuit inductor in the embodiment of the present application, the common differential mode integrated magnetic circuit inductor in the embodiment of the present application sets the ratio of the length of the left magnetic core 1 and the right magnetic core 2 to the length of the upper choke 3 and the lower choke 4 to 1.05.

[0050] It should be noted that the coil windings wound on the left magnetic core 1 and the right magnetic core 2 can be round coils or flat coils. The wire width of the coil will also affect the selection of the ratio of the length of the left magnetic core 1 and the right magnetic core 2 to the length of the upper choke 3 and the lower choke 4. In order to compromise the influence of different wire widths, after experimental research and analysis, the ratio is set to 1.05 to achieve the optimal effect.

[0051] As a further improvement on the common-differential mode integrated magnetic circuit integrated inductor in the embodiment of the present application, the lengths of the left magnetic core 1 and the right magnetic core 2 of the common-differential mode integrated magnetic circuit integrated inductor in the embodiment of the present application are set to 5 to 50 mm.

[0052] It should be noted that in order to avoid the influence of the differential-mode magnetic circuit length on the common-differential-mode inductance component, in the embodiment of the present application, taking into account the influence of the differential-mode air magnetic circuit length on the differential-mode component, in order to effectively suppress the differential-mode interference, the length of the left magnetic core 1 and the right magnetic core 2 is controlled within the range of 5 to 50 mm. Upper limit control of the length can avoid the problem of reduced differential-mode component and affected differential-mode interference suppression effect due to the longer differential-mode air magnetic circuit length. Lower limit control of the length can avoid the problem of excessive differential-mode component and easy saturation due to the short differential-mode air magnetic circuit length.

[0053] As a further improvement to the common differential mode integrated magnetic circuit integrated inductor in the embodiment of the present application, the protruding length of the first protrusion 7 and the second protrusion 8 in the common differential mode integrated magnetic circuit integrated inductor in the embodiment of the present application does not exceed the width of the upper choke portion 3 and the lower choke portion 4.

[0054] The protruding length of the first protrusion 7 and the second protrusion 8 is not less than 1 mm.

[0055] It should be noted that the lower limit of the protruding length of the upper and lower chokes is controlled to be not less than 1 mm. This is because if the protruding length is too small, the "C"-shaped differential mode interference suppression flux circuit formed with the left and right magnetic cores will not be obvious, which will greatly reduce the differential mode inductance and cannot effectively prevent the line from loosening and protect the wire wrap. The upper limit of the protruding length is controlled at a protruding length not exceeding the width of the upper choke 3 and the lower choke 4. This is based on the balance of the core structure to prevent hidden cracks in the core and production difficulties.

[0056] As a further improvement of the common-differential mode integrated magnetic circuit integrated inductor in the embodiment of the present application, the common-differential mode integrated magnetic circuit integrated inductor in the embodiment of the present application has a first preset gap after the coils are symmetrically wound around the left magnetic core 1 and the right magnetic core 2, and the gap length is between 1.5 mm and 6 mm.

[0057] It should be noted that the upper limit of the gap length is controlled at 6mm to prevent the increase of the magnetic path length of the useless common-mode component by stretching the lateral length of the upper and lower chokes, thereby reducing the common-mode component inductance; the lower limit of the gap length is controlled at 1.5mm to take into account the balance of the core structure and prevent winding difficulties.

[0058] As a further improvement to the embodiment of the present application, the left magnetic core 1 and the right magnetic core 2 are provided with an upper choke portion 3 or a lower choke portion 4 protruding in the vertical direction.

[0059] It should be noted that if Figures 4 to 6 As shown, considering the realization of differential common mode magnetic circuit integration, sufficient margin is left in the upper and lower positions of the product, and the upper choke 3 or lower choke 4 can be protruded in the vertical direction of the left core 1 and the right core 2. If sufficient margin is left in the product width, symmetrical protrusions can be set in the left and right bilateral directions, such as Figures 7 to 9 If the product height has enough margin, and the upper and lower choke areas are increased at the same time, the common mode and differential mode inductances can be improved simultaneously, the common and differential mode integrated magnetic circuit integrated inductor in the embodiment of the present application can be set as a bilateral overall symmetrical raised structure, as shown in FIG. Figures 10 to 12 shown.

[0060] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A common-differential mode integrated magnetic circuit integrated inductor, characterized in that: include: A left magnetic core, a right magnetic core, an upper choke and a lower choke; The left and right ends of the upper choke portion and the lower choke portion are connected to the left magnetic core and the right magnetic core respectively; The left magnetic core and the right magnetic core are wound with coils having a preset number of turns; A first preset gap is reserved between the left magnetic core and the right magnetic core, and a second preset gap is reserved between the upper choke portion and the lower choke portion; The upper choke portion is provided with a first protrusion in the front-to-back direction, and the lower choke portion is provided with a second protrusion in the front-to-back direction, and the first protrusion and the second protrusion have the same protruding direction; The ratio of the length of the left magnetic core and the right magnetic core in the vertical direction to the length of the upper choke portion and the lower choke portion in the left-right direction is 0.8-1.5; The protruding lengths of the first protrusion and the second protrusion along the front-to-back direction do not exceed the widths of the upper choke portion and the lower choke portion along the front-to-back direction.

2. The common-differential mode integrated magnetic circuit integrated inductor according to claim 1, characterized in that: The ratio of the length of the left magnetic core and the right magnetic core in the vertical direction to the length of the upper choke portion and the lower choke portion in the left-right direction is 1.

05.

3. The common-differential mode integrated magnetic circuit integrated inductor according to claim 1 or 2, characterized in that: The lengths of the left magnetic core and the right magnetic core along the vertical direction are 5-50 mm.

4. The common-differential mode integrated magnetic circuit integrated inductor according to claim 1, characterized in that: The protruding length of the first protrusion and the second protrusion along the front-to-back direction is not less than 1 mm.

5. The common-differential mode integrated magnetic circuit integrated inductor according to claim 1, characterized in that: The left magnetic core and the right magnetic core are arranged to protrude from the upper yoke portion or the lower yoke portion in the vertical direction.

6. The common-differential mode integrated magnetic circuit integrated inductor according to claim 1, characterized in that: The first protrusion and the second protrusion are respectively arranged at two ends of the upper choke portion and the lower choke portion.

7. The common-differential mode integrated magnetic circuit integrated inductor according to claim 1, characterized in that: The coil of the left magnetic core and the coil of the right magnetic core are symmetrical windings.

8. The common-differential mode integrated magnetic circuit integrated inductor according to claim 5, characterized in that: The first protrusion and the second protrusion are respectively arranged in the middle of the upper choke portion and the lower choke portion.

9. The common-differential mode integrated magnetic circuit integrated inductor according to claim 1, characterized in that: The first protrusion and the second protrusion are square structures.

Images