Anti-coupling inductor and power supply

Abstract

The utility model relates to an anti-coupling inductor and a power supply, the anti-coupling inductor comprises a magnetic core and a plurality of windings arranged in the magnetic core, the plurality of windings comprise a first winding and a second winding which are arranged at an interval, and the first winding and the second winding are mutually insulated; the first winding and the second winding are respectively bent and wound by a conductor to form a bent anti-coupling section; when current is connected to the first winding and the second winding, in the corresponding anti-coupling sections, the current directions are opposite, the magnetic field directions are opposite, and mutual offset is achieved, so that magnetic field anti-coupling is achieved. The coupling coefficient of the inductor is controlled by controlling the size and / or the position of the bent anti-coupling section; wherein after the winding, the end parts of the anti-coupling sections of the first winding and the second winding are arranged close to each other. By utilizing the physical structure of the double coupling windings, the current in the same direction is changed into the current in the opposite direction so as to achieve the effect of mutually counteracting magnetic fields, thereby reducing electromagnetic interference and improving the stability of the system.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic components, in particular to an anti-coupling inductor and a power supply. Background Art

[0002] With the development of technologies such as semiconductor processes and packaging, the power density of module power supplies is getting higher and higher, and the requirements for conversion efficiency are also getting higher and higher. A reasonable and effective layout of various components on the PCB board becomes more and more important. The power supply system often requires multiple independent DC-DC module power supplies, and each module is required to be able to output independently or work in parallel. POL (Point-of-Load power supply) is a type of DC-DC module power supply. Due to the many advantages of modular layout, module power supplies are widely used in communication fields such as interchange equipment, access equipment, mobile communication, microwave communication, optical transmission, routers, and also in fields such as automotive electronics and aerospace. Inductive components are usually the largest in volume and the heaviest in weight in DC-DC module power supplies. Therefore, the structure and arrangement of inductors will directly affect the positions of other components. The POL power supply can supply power to application-specific integrated circuits (ASICs), digital signal processors (DSPs), microprocessors, memories, field-programmable gate arrays (FPGAs), and other digital or analog loads. Currently, magnetically integrated inductors have begun to be used in POL power supplies. Such magnetically integrated inductors generally have two windings integrated in one magnetic core, and have the advantages of fast heat dissipation, small volume, and high efficiency. However, there is a positive coupling phenomenon between these two windings in the magnetic core; the mutual inductance phenomenon of positive coupling will cause the magnetic fields to be superimposed, increase the current ripple, and cause unnecessary losses; the mutual inductance phenomenon will also enhance electromagnetic interference and reduce the system stability; the superimposed magnetic field will increase the inductance and hinder the change of current, thus affecting the dynamic response characteristics. Summary of the Utility Model

[0003] The main purpose of the utility model is to provide an anti-coupling inductor, which solves the problems caused by the positive coupling of existing magnetically integrated inductors resulting in mutual inductance phenomena, such as unnecessary losses caused by increased current ripple, enhanced electromagnetic interference leading to reduced system stability, and the superimposed magnetic field increasing the inductance and hindering the change of current, thereby affecting the dynamic response characteristics, and improves the inductance value of the inductor under the condition of the same magnetic core volume.

[0004] Another purpose of the utility model is to provide a power supply, which solves the problems of current loss or system instability caused by the positive coupling of the magnetically integrated inductor in the existing power supply.

[0005] To achieve the above purposes, the utility model adopts the following technical solutions:

[0006] An anti-coupling inductor includes a magnetic core and a plurality of windings disposed inside. The plurality of windings include a first winding and a second winding arranged at intervals, and the first winding and the second winding are insulated from each other; the first winding and the second winding are respectively formed by winding a conductor in a zigzag manner to form a bent anti-coupling section; when the first winding and the second winding are connected to a current, within the corresponding anti-coupling section, the current directions are opposite and the magnetic field directions are opposite and cancel each other out, so as to achieve magnetic field anti-coupling; by controlling the size and / or position of the bent anti-coupling section, the coupling coefficient of the inductor is controlled; wherein, after being wound in a zigzag manner, the ends of the anti-coupling sections of the first winding and the second winding are arranged close to each other.

[0007] Further, for the first winding and the second winding, their corresponding bent anti-coupling sections have a predetermined degree of overlap on the projection plane; by controlling the distance between the first winding and the second winding and / or the projection overlap degree between the first winding and the second winding, the anti-coupling degree between the first winding and the second winding is controlled; after the inductor is connected to a circuit, the current is input and output from the same plane of the inductor; the circuit connected to the inductor is a two-phase parallel interleaved circuit or two independent BUCK circuits.

[0008] In some embodiments, each of the first winding and the second winding includes a positive coupling section, and the distance between the corresponding anti-coupling sections of the first winding and the second winding is less than or equal to the distance between their corresponding positive coupling sections.

[0009] In some embodiments, the anti-coupling inductor is multi-coupled and integrated; the multi-coupled windings are arranged in a manner that the first winding and the second winding are arranged at intervals, or two adjacent first windings and two adjacent second windings are arranged at intervals.

[0010] In some embodiments, one of the first winding and the second winding is Ω-shaped and the other is anti-Ω-shaped; the first winding and the second winding are combined into a circle on the projection plane; the corresponding bent anti-coupling sections of the first winding and the second winding overlap an arc on the projection plane; the first winding is a symmetric structure along the central axis; the second winding is a symmetric structure along the central axis.

[0011] In some embodiments, the first winding includes a first anti-coupling section and a second anti-coupling section, and the first anti-coupling section and the second anti-coupling section are in a positive and negative S shape with respect to each other; the first winding includes a positive coupling section, and the positive coupling section is connected between the first anti-coupling section and the second anti-coupling section to form an integral continuous arc; the first anti-coupling section, the second anti-coupling section, and the positive coupling section are coplanar; the second winding includes a first anti-coupling section and a second anti-coupling section, and the first anti-coupling section and the second anti-coupling section are in a positive and negative S shape with respect to each other; the second winding includes a positive coupling section, and the positive coupling section is connected between the first anti-coupling section and the second anti-coupling section to form an integral continuous arc; the first anti-coupling section, the second anti-coupling section, and the positive coupling section are coplanar; for the first winding and the second winding, their first anti-coupling sections correspond to coincide and are on the same side of the circle of the projection plane; for the first winding and the second winding, their second anti-coupling sections correspond to coincide and are on the other side of the circle of the projection plane; for the first winding and the second winding, their positive coupling sections are respectively located at opposite ends of the circle of the projection plane.

[0012] In some embodiments, both the first winding and the second winding are in a planar or flat plate structure as a whole; each of the first winding and the second winding includes a main body and a pair of pins on both sides of the main body; the main body and the pins are coplanar; the respective two pins of the first winding and the second winding are respectively exposed on two opposite end faces and / or opposite sides of the same end face of the magnetic core to be electrically connected to the circuit of the circuit board; the first winding and the second winding are arranged parallel to each other front and back; the main body of the first winding is bent downward relatively, and the pins on both sides of the main body extend downward relatively from the top, and the two pins are parallel and coplanar with each other; the main body of the second winding is bent upward relatively and extends, and the pins on both sides of the main body extend downward relatively from the bottom.

[0013] In some embodiments, the pair of pins of the first winding are long pins; the two pins of the second winding are short pins; one long pin of the first winding and one short pin of the second winding are parallel and located on the same side, and are exposed and spaced from each other on the same end face and / or the same side edge of the magnetic core to be electrically connected to the circuit of the circuit board; the other long pin of the first winding and the other short pin of the second winding are parallel and located on the same side, and are exposed and spaced from each other on the other opposite end face of the magnetic core and / or the opposite side of the same end face to be electrically connected to the circuit of the circuit board.

[0014] In some embodiments, the plurality of windings include two adjacent first windings and two adjacent second windings, and the two adjacent first windings and the two adjacent second windings are arranged in the magnetic core at intervals; the two adjacent first windings are insulated from each other, and the two adjacent second windings are insulated from each other.

[0015] Two adjacent first windings are nested inside and outside, one large and one small, close to each other; two adjacent second windings are nested inside and outside, one large and one small; or, two adjacent first windings are parallel and close to each other, and two adjacent second windings are parallel and close to each other, and two adjacent first windings and two adjacent second windings are four parallel conductors. Among them, one group of first windings and the second winding are used as main windings, and the other group of first windings and the second group are auxiliary windings, and the auxiliary windings are connected in series inside the circuit board or the magnetic core.

[0016] The present application also provides a power supply, including a circuit board and the anti-coupling inductor described in any of the above embodiments, wherein the anti-coupling inductor is electrically connected to the circuit board.

[0017] The beneficial effects of the utility model are:

[0018] The anti-coupling inductor of the utility model utilizes the physical structure of the dual-coupling winding to convert the current in the same direction into the current in the opposite direction to achieve the effect of magnetic field mutual cancellation, thereby reducing electromagnetic interference and improving the stability of the system; the anti-coupled magnetic fields cancel each other out, reducing the loss caused by the mutual inductance phenomenon, reducing the current ripple, and improving the efficiency; the anti-coupling characteristic reduces the inductance of the superposition of mutual inductance, so as to improve the dynamic response characteristics; the inductance value is increased under the condition of the same magnetic core volume to meet the basic inductance requirements of the circuit. In addition, by winding the winding and the curved anti-coupling part with a conductor in a zigzag manner, the conductor length is increased, and the magnetic flux lines are correspondingly increased, thereby increasing the initial inductance to meet the circuit requirements.

[0019] Furthermore, the coupling coefficient and inductance can be controlled by controlling the size and position of the curved anti-coupling portion.

[0020] The magnetic core of the utility model has the characteristic of high density, and the magnetic core and the winding are closely combined, which has good heat conduction and heat dissipation effects, so that the magnetic core can maintain a low working temperature.

[0021] Furthermore, the two windings of the utility model have simple structures, and the process for preparing the windings is simple, easy to implement automatically, and low in cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figures 1-3 It is a stereoscopic diagram of the anti-coupling inductor of the first embodiment of the utility model from different viewing angles.

[0023] Figures 4-5 It is a perspective view of the anti-coupling inductor of the first embodiment of the utility model in different directions.

[0024] Figure 6 It is a projection surface view of the inner winding of the anti-coupled inductor according to the first embodiment of the utility model.

[0025] Figure 7 It is a three-dimensional diagram of the first winding in the anti-coupled inductor of the first embodiment of the utility model.

[0026] Figure 8 It is a perspective view of the second winding in the anti-coupling inductor of the first embodiment of the present utility model.

[0027] Figure 9 It is an application circuit diagram of the anti-coupling inductor of the embodiment of the present utility model.

[0028] Figure 10 It is a perspective view of the multi-channel coupling inductor of the embodiment of the present utility model.

[0029] Figure 11 It is a perspective view of the anti-coupling inductor of the second embodiment of the present utility model.

[0030] Figure 12 It is a perspective view of the anti-coupling inductor of the second embodiment of the present utility model.

[0031] Figure 13 It is a perspective view of the winding in the anti-coupling inductor of the second embodiment of the present utility model. Detailed implementation manners

[0032] The exemplary embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present application can be more thoroughly understood and the scope of the present application can be fully conveyed to those skilled in the art.

[0033] It should be understood that the terms used herein are only for the purpose of describing specific exemplary embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" as used herein may also include the plural forms. The terms "comprising", "including", "containing" and "having" are inclusive and thus specify the presence of the stated features, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the particular order described or illustrated, unless the order of execution is explicitly stated. It should also be understood that additional or alternative steps may be used.

[0034] Although the terms first, second, etc. may be used herein to describe multiple elements, components, regions, layers, and / or sections, these elements, components, regions, layers, and / or sections should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or section from another region, layer, or section. Unless the context clearly indicates otherwise, terms such as "first", "second", and other numerical terms do not imply an order or sequence when used herein. Thus, the elements, components, regions, layers, or sections discussed below may be referred to as second elements, components, regions, layers, or sections without departing from the teachings of the exemplary embodiments.

[0035] For ease of description, spatial relative relationship terms may be used herein to describe the relationship of one element or feature shown in the figures to another element or feature, such as "inner", "outer", "inside", "outside", "below", "beneath", "above", "over", "front end", "rear side", etc. Such spatial relative relationship terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is flipped, an element described as "below" or "beneath" another element or feature will then be oriented "above" or "over" the other element or feature. Thus, the exemplary term "below" can include both upward and downward orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used herein are interpreted accordingly.

[0036] Please refer to Figures 1-13 as shown, wherein Figures 4-5 and Figures 10-11 are perspective views, showing the internal winding structure assuming the magnetic core is in a transparent state; the present invention relates to an anti-coupling inductor 100, which includes a magnetic core 3 and a dual-coupling winding or a multi-coupling winding inside the magnetic core 3. The dual-coupling winding includes a first winding 1 and a second winding 2. The multi-coupling winding may be arranged in a manner where the first winding 1 and the second winding 2 are arranged at intervals, or where two adjacent first windings 1 and two adjacent second windings 2 are arranged at intervals. When the multi-coupling winding has an odd number of windings, it is preferably arranged in a manner where the first winding 1 and the second winding 2 are arranged at intervals. The windings are insulated from each other. The windings may be insulated by the magnetic core 3. Specifically, when the magnetic core 3 is formed by pressing insulating magnetic core powder, the magnetic core powder fills between the windings to insulate each winding, or the windings are insulated from each other by coating an insulating film on the surface of the windings.

[0037] For the anti-coupling inductor 100 of the present application, an anti-coupling is formed between the first winding 1 and the second winding 2 integrated in the magnetic core 3, and the curved anti-coupling sections are respectively formed by winding conductors. When the inductor 100 is connected to a circuit and the first winding 1 and the second winding 2 are connected to a current, in their corresponding anti-coupling sections, the current directions are opposite and the magnetic field directions are opposite, so as to achieve magnetic field anti-coupling. The coupling coefficient of the inductor is controlled by controlling the size and / or position of the curved anti-coupling section. After being wound in a zigzag manner, the distance d3 between the ends 140 and 150 of the anti-coupling section of the first winding 1 and the distance d4 between the ends 240 and 250 of the anti-coupling section of the second winding 2 are both arranged to be close to each other, that is, smaller than the distance between other parts of the positive coupling sections. The corresponding curved anti-coupling sections of the first winding 1 and the second winding 2 have a predetermined overlap degree on the projection plane to achieve the expected anti-coupling degree. The anti-coupling degree between the first winding 1 and the second winding 2 can be controlled by controlling the distance between the first winding 1 and the second winding 2 and / or the projection overlap degree between the first winding 1 and the second winding 2.

[0038] Both the first winding 1 and the second winding 2 include positive coupling sections, and the distance between the corresponding anti-coupling sections of the first winding 1 and the second winding 2 can be set to be less than or equal to the distance between their corresponding positive coupling sections to control the anti-coupling degree and reduce the positive coupling.

[0039] Figures 1-10 The anti-coupling inductor 100 shown in the first embodiment, wherein the first winding 1 and the second winding 2 are a deformed U-shaped (not exactly the same as the U shape) winding of an integral structure, and are formed by winding a conductor such as a copper wire in a zigzag manner. Each winding includes a winding body and pins. The first winding 1 includes a winding body 10 and a pair of pins 11 and 12, and the second winding 2 includes a winding body 20 and a pair of pins 21 and 22. The first winding 1 and the second winding 2 respectively include corresponding anti-coupling sections and positive coupling sections; after the inductor is connected to a circuit and energized, the current directions in the anti-coupling sections of the first winding 1 and the second winding 2 are opposite and the magnetic field directions are opposite, forming an anti-coupling part, and the current directions in the corresponding positive coupling sections are the same, forming a positive coupling part. The first winding 1 and the second winding 2 include curved anti-coupling sections, which can be circular arcs and / or curved lines, and the coupling coefficient and inductance can be controlled by controlling the size / length and position of the curved anti-coupling section (i.e., the circular arc or curved line).

[0040] Exemplarily, the main body 10 of the first winding 1 includes a positive coupling section 13, a first anti-coupling section 14, and a second anti-coupling section 15. Among them, the positive coupling section 13, the first anti-coupling section 14, and the second anti-coupling section 15 are three arc segments. The positive coupling section 13 is connected between the first anti-coupling section 14 and the second anti-coupling section 15 to form a main body 10 of a larger-angled arc or an unclosed circle (including a similar arc or circle). Specifically, the first anti-coupling section 14 and the second anti-coupling section 15 each include an arc (or curve) segment. The first anti-coupling section 14 and the second anti-coupling section 15 are symmetric structures, and the positive coupling section 13 is an arc (or curve, and can also be a straight line). The arc radii of the positive coupling section 13, the first anti-coupling section 14, and the second anti-coupling section 15 are the same (or the curvatures of the curve shapes are the same), so they are connected together to form a larger-arc arc, that is, an unclosed circle (including a similar arc or a similar circle). In the orientation shown in the figure, the winding main body 10 is an inverted Ω shape (which can be an exactly the same or approximate inverted Ω shape), including a large arc in the middle (that is, an unclosed circle, including a similar arc or circle). The first anti-coupling section 14 and the second anti-coupling section 15 are respectively on the left and right sides of the inverted Ω-shaped main body and are symmetric. The arc of the positive coupling section 13 is at the bottom. The free ends of the first anti-coupling section 14 or the second anti-coupling section 15 (that is, the two ends of the main body 10) extend upward, preferably extending upward in a zigzag manner to form a curve shape. Exemplarily, the first anti-coupling section 14 and the second anti-coupling section 15 are respectively positive and negative S shapes, symmetric along the winding central axis H1, and the bottom is integrally connected by the positive coupling section 13. The free ends of the first anti-coupling section 14 and the second anti-coupling section 15 are bent and extended in the opposite direction from the top to form two pins 11, 12. The two pin positions 11, 12 are respectively on both sides of the inverted Ω-shaped main body 10, so that the first winding 1 forms a deformed U-shaped winding (not exactly the same as a U shape). The main body 10 includes pins 11, 12 extending from both sides of the main body 10 to form vertical straight line segments, and the pins are parallel to each other. The pins 11, 12 and the winding main body 10 are coplanar. The first anti-coupling section 14, the positive coupling section 13, and the second anti-coupling section 15 included in the winding main body are coplanar; therefore, the first winding 1 is a planar or flat plate structure, that is, the cross-section of the conductor winding the first winding is the same, and the conductor is zigzag along the length to form the main body 10 of the first winding 1 and the pins 11, 12, and the thickness d1 is the same. The end faces of the pins 11, 12 are 110, 120. The end of the pin can be formed into a stepped shape to expand the area of the end of the pin, which is convenient for connecting with the electronic circuit of the circuit board. It can be understood that the positive coupling section 13, the first anti-coupling section 14, and the second anti-coupling section 15 can be a combined shape of an arc, a curve, or a straight line, so that the whole winding main body is in an inverted Ω shape (including an approximate Ω shape). The pins 11, 12 are bent in the opposite direction along both sides of the inverted Ω-shaped main body to form straight pins (not limited to straight shapes). The first winding 1 as a whole is in a deformed U shape (not exactly the same as a U shape) and is symmetric along the central axis H1. Preferably, the winding 1 is a conductor of an integral structure.

[0041] Exemplarily, the body 20 of the second winding 2 includes a positive coupling section 23, a first anti-coupling section 24, and a second anti-coupling section 25. Among them, the positive coupling section 23, the first anti-coupling section 24, and the second anti-coupling section 25 are three arc segments (or curves). The positive coupling section 23 is connected between the first anti-coupling section 24 and the second anti-coupling section 25 to form the body 20. By way of non-limiting example, the body 20 of the second winding 2 has the same shape as the body 10 of the first winding 1 but in the opposite direction. The body 10 of the first winding 1 is in an inverted Ω shape, and the body 20 of the second winding 2 is in a positive Ω shape. The first anti-coupling section 24 and the second anti-coupling section 25 each include an arc segment (or curve segment). The first anti-coupling section 24 and the second anti-coupling section 25 are symmetric structures, and the positive coupling section 23 is an arc segment (or curve). The arc radii of the positive coupling section 23, the first anti-coupling section 24, and the second anti-coupling section 25 are the same (or the curvatures of the curve shapes are the same), so they are connected together to form a larger arc or an unclosed circle (including a similar arc or a similar circle). In the orientation shown in the figure, the winding body 20 is in an Ω shape (which can be exactly the same or approximately the same Ω shape), including a large arc in the middle (i.e., an unclosed circle, including a similar arc or a circle). The first anti-coupling section 24 and the second anti-coupling section 25 are symmetrically arranged on the left and right sides of the Ω-shaped body respectively. The arc of the positive coupling section 23 is at the top. The free ends of the first anti-coupling section 24 or the second anti-coupling section 25 (i.e., the two ends of the body 20) extend downward, preferably extending downward in a zigzag manner to form a curve shape. Exemplarily, the first anti-coupling section 24 and the second anti-coupling section 25 are respectively in a positive and negative S shape, symmetric about the winding central axis H2, and the top is integrally connected by the positive coupling section 23. The free ends of the first anti-coupling section 24 and the second anti-coupling section 25 are bent and extended in the opposite direction from the bottom to form two pins 21, 22. The two pin positions 21, 22 are respectively on both sides of the Ω-shaped body 20, so that the second winding 2 forms an Ω shape (or a similar Ω shape) or a deformed U-shaped winding (not exactly the same as a U shape). The pins 21, 22 extend from both sides of the body 20 to form a horizontal straight line shape, and the bottoms of the pins are on the same horizontal line (not limited to being collinear). The pins 21, 22 and the winding body 20 are coplanar. The first anti-coupling section 24, the positive coupling section 23, and the second anti-coupling section 25 included in the winding body 20 are coplanar. Therefore, the second winding 2 is a planar or flat plate structure, that is, the cross-section of the conductor winding the first winding is the same, and the conductor is zigzag along the length to form the body 20 of the second winding 2 and the pins 21, 22, and the thickness d2 is the same. The end faces of the ends of the pins 21, 22 are 210, 220. It can be understood that the positive coupling section 23, the first anti-coupling section 24, and the second anti-coupling section 25 can be a combined shape of an arc, a curve, or a straight line. The body 20 of the second winding or the whole winding is in an Ω shape (including an approximate Ω shape) or a deformed U shape (not exactly the same as a U shape), and is symmetric about the central axis H2. Preferably, the second winding 2 is formed by bending a conductor of an integral structure.

[0042] It is understandable that the circuit board can be a PCB board.

[0043] The first winding 1 and the second winding 2 are parallel to each other and are arranged in the magnetic core 3 at intervals in the front and back. The first winding 1 and the second winding 2 form a circle (including a similar circle) on one of the projection planes. Refer to Figure 6 , the arc segments of the first anti-coupling section 14 of the first winding 1 and the first anti-coupling section 24 of the second winding 2 are arranged close to each other in the front and back, and overlap a left arc on the projection plane, and the current directions in them are opposite, forming a first anti-coupling part 4; the arc segments of the second anti-coupling section 15 of the first winding 1 and the second anti-coupling section 25 of the second winding 2 are arranged close to each other in the front and back, and overlap a right arc on the projection plane, and the current directions in them are opposite, forming a second anti-coupling part 5. The first anti-coupling part 4 and the second anti-coupling part 5 are overlapping arcs that form the left and right arcs (including similar arcs or curves) of the circle on the projection plane. The current directions in the positive coupling section 13 of the first winding 1 and the positive coupling section 23 of the second winding 2 are the same, forming a positive coupling part. The positive coupling parts 13 and 23 respectively form the bottom and top arcs (including similar arcs or curves) of the circle on the projection plane to increase the distance between the positive coupling sections 13 and 23. By way of example, after the first winding 1 and the second winding 2 are placed parallel to each other in the front and back, their front projection forms a complete circle (or nearly circular) with a predetermined degree of overlap. After the inductor 100 is connected to the circuit of the circuit board and is turned on, the current directions in the two windings of the anti-coupling parts 4 and 5 of the first winding 1 and the second winding 2 of the double-coupling winding are opposite, generating magnetic fields in opposite directions of outward and inward, constituting anti-coupling; the current directions in the positive coupling part are the same, and the current flows into and out of the same side of the first winding and the second winding. As Figure 9 shown by the current directions of the first winding (L1) 1 and the second winding (L2) 2 in the double-coupling winding, the pins 11 and 21 of the first winding 1 and the second winding 2 are connected to the input end, and the pins 12 and 22 of the first winding 1 and the second winding 2 are electrically connected and then used as a common output end to be connected to the load. The anti-coupling inductor 100 of the present invention is mainly applied to a two-phase parallel interleaved circuit or two independent BUCK circuits.

[0044] As a non-limiting embodiment, referring again to Figures 1-8 , in the orientation shown in the figure, the first winding 1 and the second winding 2 of the double-coupling winding are arranged parallel to each other at intervals in the front and back. The second winding 2 is the front winding and the first winding 1 is the back winding. The large arc directions (i.e., unclosed circles or similar circles) of the main bodies of the first winding 1 and the second winding 2 are opposite, so that a closed circle (or similar circle) can be formed in the front projection. The arcs on both sides of the circle are overlapping arcs of the anti-coupling sections, corresponding to generating magnetic fields in opposite directions (one outward and one inward), which can cancel each other out, reducing the loss caused by the mutual inductance phenomenon, reducing the current ripple, and improving the efficiency.

[0045] In the above embodiments, after the conductors of the first winding and the second winding are wound in a zigzag manner, the distance d3 between the ends 140 and 150 of the corresponding anti-coupling sections and the distance d4 between 240 and 250 are arranged to be close to each other. Refer to Figures 7-8 .

[0046] The magnetic core 3 is preferably integrally formed. Specifically, a plurality of windings (such as the first winding 1 and the second winding 2 of a dual-coupling winding) are placed in a mold, filled with an insulating magnetic core powder, and pressure is applied for molding. The molding pressure can be 12-24T / cm 2 , to obtain an inductor green body with windings buried inside the magnetic core part and pins exposed on the surface of the magnetic core; the inductor green body is placed in a heat treatment furnace and heated and kept warm to release the residual stress inside the inductor green body, and the inductor device 100 of the embodiment of the present invention is obtained. The annealing temperature can be 400-850°C.

[0047] The magnetic core 3 is formed by co-firing and pressing an insulating magnetic core powder. The insulating magnetic core powder can be one or a combination of several powders such as iron powder, iron-silicon alloy powder, iron-silicon-aluminum alloy insulating magnetic core powder, amorphous powder, iron-nickel alloy powder, etc.

[0048] By using in-mold co-firing and pressing of the insulating magnetic core powder and the windings, the insulating magnetic core powder material is closely distributed between the windings to form a suitable spacing to achieve an insulating effect; and the magnetic core and the windings are in full contact to achieve rapid heat transfer; high-pressure molding makes there be no gap inside the entire inductor device, achieving full space utilization and realizing high power density. Co-firing and pressing the insulating magnetic core powder and multiple windings saves volume and realizes small volume and high power density.

[0049] The magnetic core 3 includes an end face 33 and adjacent end faces 31 and 32 on both sides of the end face 33. One pin of each of the first winding 1 and the second winding 2 is respectively exposed on both sides of the end face 33, and / or, exposed and extended from the two side end faces 31 or 32 so that the end faces of the pins are exposed on both sides of the end face 33. Taking the square (not limited to square) magnetic core 3 as an example, it includes a first end face 31 and a second end face 32 opposite (with Figures 1-2 the shown orientation as the left and right surfaces), a fourth end 34 and a third end face 33 opposite (with Figures 1-2 the shown orientation as the upper and lower surfaces) and a fifth end face 35 and a sixth end face 36 opposite (with Figures 1-2The shown orientation is the front and back surfaces). Inside the magnetic core 3 is an integrally formed double-coupled winding. The winding bodies of the first winding 1 and the second winding 2 are placed in opposite directions up and down and parallel front and back. The first winding 1 is located behind the second winding 2 with an interval between them. The pins of the first winding 1 and the second winding 2 are respectively exposed on the opposite first end face 31 and second end face 32 of the magnetic core 10 and the middle third end face 33. Since both ends of the body 10 of the first winding 1 are at the top, they are bent reversely and extend downward to form vertical pins 11 and 12. Both ends of the body 20 of the second winding 2 are at the bottom and extend horizontally and in the same line to both sides to form horizontal pins 21 and 22. Therefore, by way of non-limiting example, the pins 11 and 12 of the first winding 1 are long pins or high pins and are arranged vertically (along the height c of the square magnetic core 3), and the pins 21 and 22 of the second winding 2 are short pins or low pins and are arranged horizontally (along the width a of the square magnetic core 3).

[0050] Specifically, a long pin 11 of the first winding 1 and a short pin 21 of the second winding 2 are arranged parallel to each other with an interval and are located on the same side (for example, the left side), and are arranged parallel to each other with an interval and exposed on the first end face 31 of the magnetic core 3 (for example, the left end face). The end faces 110 / 210 of the pins 11 / 21 extend and are exposed on the third end face 33 of the magnetic core (for example, the lower end face) and are arranged parallel to each other with an interval. The other long pin 12 of the first winding 1 and the other short pin 22 of the second winding 2 are parallel to each other, located on the same side (for example, the right side), and are arranged parallel to each other with an interval and exposed on the second end face 32 of the magnetic core 3 (i.e., the right end face). The end faces 120 / 220 of the pins 12 / 22 extend and are exposed on the third end face 33 of the magnetic core (i.e., the lower end face) and are arranged parallel to each other with an interval. The pin 12 is linear and extends along the height direction of the end face 32 toward the third end face (the lower end face) 33. The pins 11 / 21 are on the same side of the third end face 33 (for example, the left side line of the lower end face of the magnetic core), and the pins 12 / 22 are on the other side of the third end face 33 (for example, the right side line of the lower end face of the magnetic core). The pins 11 / 21 and 12 / 22 are exposed on the magnetic core surface and keep the corresponding magnetic core surface flat. After the inductor 100 is connected to the circuit and conducts, the current flows in from the pins 11 / 21 on the same side and flows out from the pins 12 / 22 on the other side of the same side.

[0051] It can be understood that the pins of the first winding 1 and the second winding 2 may also be exposed on the core surface only on the third end face 33, that is, the end faces 110 / 210 of the pins 11 / 21 are exposed on one side of the end face 33 at intervals parallel to each other, and the end faces 120 / 220 of the pins 12 / 22 are exposed on the other opposite side of the end face 33 at intervals parallel to each other; the connection lines of the four pin end faces form a square (the same as or different from the square of the core), and the pin end faces are located at the four corner positions of the square. One pin 11, 21 of each of the first winding 1 and the second winding 2 is located on one side, and the other pin 12, 22 is located on the other side of the core. The pins are respectively exposed on two opposite end faces of the core or on opposite sides of the same end face, which is convenient for electrical connection with the pads on the circuit board. In other embodiments, a conductive layer may also be coated on the core surface along the exposed pins to expand the area of the exposed pins to form pads, which is convenient for soldering with the corresponding pads of the circuit provided on the circuit board. Preferably, the four pins 11 / 12, 21 / 22 of the dual-coupled inductor are exposed at the same end face 33 of the core, so that the four pins can be directly soldered on the same circuit board.

[0052] Exemplarily, the main body 10 of the first winding 1 and the main body 20 of the second winding 2 are buried inside the core 3. The bottom horizontal positive coupling section 13 of the main body 10 of the first winding 1 and the top horizontal positive coupling section 23 of the second winding 2 are positively coupled to each other. The lengths can be the same and are relatively located above and below the circular projections of the two windings, so as to increase the distance between the positive coupling sections 13, 23 with the same current direction. The anti-coupling portions 4, 5 of the dual-coupled windings are located on the left and right sides of the circular projections of the two windings. The lengths of the anti-coupling sections of the corresponding first winding and second winding in each coupling portion can be substantially the same and are aligned parallel to each other before and after.

[0053] The cross-sectional shapes of the first winding 1 and the second winding 2 can be but are not limited to circular, rectangular, etc. Exemplarily, the cross-sections of the conductors winding the first winding 1 and the second winding 2 are the same. The conductors wind the two windings tortuously. The overall of each winding is coplanar and in a planar (or flat plate) shape. The main bodies of the two windings are opposite. For example, the main body of one winding is in a forward Ω shape, and the main body of the other winding is in a reverse Ω shape. The "forward" and "reverse" are defined relatively and can face any spatial direction, so that the bending shapes of the main body segments of the two windings are opposite and parallel to each other before and after, and the projections of the two winding main bodies obtain a circular or approximately circular shape with a degree of overlap.

[0054] In other embodiments, referring to Figure 10 , inside the core 3, the second winding 2 is arranged behind the first winding 1, and / or the first winding 1 is arranged in front of the second winding 2, and so on, so as to obtain multiple couplings. The structures, couplings, current directions, etc. of each two adjacent first windings 1 and second windings 2 are the same as those of the above-described dual-coupling embodiment, and there is an anti-coupling portion between each pair of dual-coupled windings. Thus, a multiple-coupled inductor is obtained.

[0055] The anti-coupling inductor 100 of the present utility model has the following characteristics:

[0056] 1) By utilizing the physical structure of the winding, the current in the same direction is changed into the current in the opposite direction to achieve the effect of mutual magnetic field cancellation (i.e., anti-coupling), thereby reducing electromagnetic interference and improving the stability of the system;

[0057] 2) The anti-coupling magnetic fields cancel each other out, that is, the loss caused by the mutual inductance phenomenon (magnetic field superposition) is reduced, the current ripple is decreased, and the efficiency is improved;

[0058] 3) For the inductor of the present utility model, the anti-coupling characteristic of its winding reduces the inductance of the mutual inductance superposition, so the dynamic response characteristic is improved (a small inductance is beneficial to the dynamic response);

[0059] 4) For the inductor of the embodiment of the present utility model, through the in-mold co-firing and pressing of the insulating magnetic core powder and the winding into an integral structure, the obtained inductor has a high-density characteristic, and the magnetic core and the winding are tightly combined, so it has good heat conduction and heat dissipation effects, enabling it to maintain a low working temperature; specifically, the winding is placed in the insulating magnetic core powder (the insulating magnetic core powder can be composed of iron powder, iron-silicon alloy powder, iron-silicon-aluminum alloy magnetic powder, amorphous powder, iron-nickel alloy powder, etc.) and then high-pressure formed, so that the magnetic core and the winding are in full contact to achieve rapid heat transfer; the high-pressure forming makes there be no gap inside the whole device to achieve full space utilization and realize high power density;

[0060] 5) For the inductor of the embodiment of the present utility model, the structure of its winding is simple, the process of preparing the winding is simple, it is easy to be implemented automatically, and the cost is low;

[0061] 6) The inductor of the embodiment of the present utility model can increase the magnetic induction lines by increasing the length of the conductor (such as copper wire) in the magnetic core, thereby increasing the initial inductance to meet the circuit requirements;

[0062] 7) For the inductor of the embodiment of the present utility model, the pins of its winding are coplanar, and the four pins of the double-coupling winding can be directly welded on the same circuit board;

[0063] 8) The inductor of the embodiment of the present utility model can control the coupling coefficient and inductance by controlling the size / length and position of the arc (curve) of the anti-coupling part.

[0064] For the inductor of the embodiment of the present utility model, its winding is formed by winding the conductor in a zigzag manner, and the length is increased by the zigzag conductor to provide a higher initial inductance.

[0065] The present utility model also provides a power supply, which includes a circuit board and the anti-coupling inductor 100 of the above embodiment. The pins 11 and 12 of the first winding 1 of the double-coupling windings in the anti-coupling inductor 100 and the pins 21 and 22 of the second winding 2 are exposed on the surface of the magnetic core to form pads, which are welded and electrically connected to the corresponding pads of the circuit on the circuit board. The power supply is mainly a POL power supply, and the circuit on the circuit board is mainly a two-phase parallel interleaved circuit or two independent BUCK circuits. The current flows into and out of the inductor 100 from the same side. The windings inside the inductor form anti-coupling, reducing electromagnetic interference, improving the stability of the system, reducing the current ripple, and improving the efficiency. The POL power supply can supply power to application-specific integrated circuits (ASICs), digital signal processors (DSPs), microprocessors, memories, field-programmable gate arrays (FPGAs), and other digital or analog loads.

[0066] Referring to Figures 11-13 , the second embodiment provides a TLVR inductor 100, in which two adjacent first windings 1, 1' and two adjacent second windings 2, 2' are arranged at intervals in the magnetic core 3. The two adjacent first windings 1, 1' and the two adjacent second windings 2, 2' are symmetrically arranged in the magnetic core 3 and form anti-coupling with each other. In the first embodiment, the first winding pair 1 is an inverted Ω-shaped conductor, and the second winding pair 2 is a positive Ω-shaped conductor, corresponding to four pins 11, 12, 21, 22, which are exposed on the opposite sides of the same end face 33 of the magnetic core 3 for electrical connection with the circuit on the circuit board; in this embodiment, the two adjacent first windings 1, 1' are two inverted Ω-shaped conductors, and the two adjacent second windings 2, 2' are two positive Ω-shaped conductors, corresponding to 8 pins 11 / 11', 12 / 12', 21 / 21', 22 / 22', which are respectively exposed on the opposite sides of the same end face 33 of the magnetic core 3, that is, the pins 11 / 11', 21 / 21' for input current are exposed on the left side of the end face 33, and the pins 12 / 12', 22 / 22' for output current are exposed on the right side of the opposite end face 33, corresponding to the solder feet of the TLVR circuit. A high coupling is formed between the two adjacent first windings 1, 1', the internal current directions are the same, and the current is input and output coplanarly. A high coupling is formed between the two adjacent second windings 2, 2', the internal current directions are the same, and the current is input and output coplanarly. An anti-coupling is formed between the two adjacent first windings 1, 1' and the two adjacent second windings 2, 2', the internal current directions are opposite, and the current is input and output coplanarly.

[0067] Two adjacent first windings 1 and 1' have the same shape, are proportional in size, are close to each other and arranged in parallel, and are insulated from each other by a magnetic core 3 (i.e., magnetic core powder is filled between the two adjacent first windings 1 and 1'). Each includes a positive coupling section 13, a first anti-coupling section 14, and a second anti-coupling section 15. Among them, the positive coupling section 13, the first anti-coupling section 14, and the second anti-coupling section 15 are three arcs. The positive coupling section 13 is connected between the first anti-coupling section 14 and the second anti-coupling section 15 to form an anti-Ω-shaped body 10 with a larger arc or an unclosed circle (including a similar arc or circle), and leads 11 and 12 are formed on both sides. Two adjacent second windings 2 and 2' have the same shape, are proportional in size, are parallel to each other, are close to each other, and are insulated from each other by a magnetic core 3 (i.e., magnetic core powder is filled between the two adjacent second windings 2 and 2'). Each includes a positive coupling section 23, a first anti-coupling section 24, and a second anti-coupling section 25. Among them, the positive coupling section 23, the first anti-coupling section 24, and the second anti-coupling section 25 are three arcs (or curves). The positive coupling section 23 is connected between the first anti-coupling section 24 and the second anti-coupling section 25 to form a Ω-shaped body 20. The conductors between the windings 1 / 1' and 2 / 2' are also insulated from each other by a magnetic core 3.

[0068] It can be understood that between two adjacent first windings 1 and 1' or between two adjacent second windings 2 and 2', mutual insulation and close proximity can be achieved by an insulating layer coated on the surface of the conductor. The two adjacent first windings 1 and 1' and the two adjacent second windings 2 and 2' are also insulated from each other by the insulating layer on the surface of the conductor, and then assembled into the magnetic core 3.

[0069] The windings inside the anti-coupling inductor 100 of the second embodiment, two adjacent first windings 1 and 1' are nested inside and outside, one large and one small, and are close to each other; two adjacent second windings 2 and 2' are nested inside and outside, one large and one small, and are close to each other. It can be understood that two adjacent first windings 1 and 1' can also be close to each other in parallel front and back, and the sizes can be the same or different; two adjacent second windings 2 and 2' are also close to each other in parallel front and back, and the sizes can be the same or different; at this time, the two adjacent first windings 1 and 1' and the two adjacent second windings 2 and 2' are four parallel conductors. The windings 1' and 2' are auxiliary windings. The auxiliary windings 1' and 2' are connected in series inside the circuit board or the magnetic core 3. The leads of the windings 1 and 2 correspond to the solder pads of the TLVR circuit. For example, the leads 11 and 21 are respectively connected to the switching unit at the input end, the leads 12 and 22 are electrically connected and used as a common output end to be connected to the load, the lead 11' is connected to the compensation inductor Lc, and the lead 12' is electrically connected to the lead 21'.

[0070] Although embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The protection scope of the present utility model is defined by the appended claims and their equivalent scope.

Claims

1. A reverse coupling inductor, comprising a magnetic core and a plurality of windings arranged inside, wherein the plurality of windings comprises a first winding and a second winding arranged at intervals, and the first winding and the second winding are insulated from each other; characterized in that: The first winding and the second winding are respectively formed by winding a conductor in a zigzag manner to form a curved anti-coupling section; when the first winding and the second winding are connected to current, in the corresponding anti-coupling sections, the current directions are opposite and the magnetic fields are opposite, which cancel each other out, thereby achieving magnetic field anti-coupling; the coupling coefficient of the inductance is controlled by controlling the size and / or position of the curved anti-coupling section; wherein, after zigzag winding, the ends of the anti-coupling sections of the first winding and the second winding are arranged close to each other.

2. The anti-coupled inductor according to claim 1, characterized in that: The first winding and the second winding, the corresponding curved anti-coupling segments have a predetermined overlap on the projection surface; the anti-coupling degree between the first winding and the second winding is controlled by controlling the distance between the first winding and the second winding and / or the projection overlap of the first winding and the second winding; After the inductor is connected to the circuit, the current is input and output from the same side of the inductor; The circuit connected by the inductors is a two-phase parallel interleaved circuit or two independent BUCK circuits.

3. The anti-coupled inductor according to claim 1, characterized in that: The first winding and the second winding each include a positive coupling segment, and the distance between the corresponding negative coupling segments of the first winding and the second winding is less than or equal to the distance between the corresponding positive coupling segments.

4. The anti-coupled inductor according to claim 1, wherein: The anti-coupling inductor is a multi-way coupling integration; the multi-way coupling winding is arranged in a manner that the first winding and the second winding are arranged at intervals, or in a manner that two adjacent first windings and two adjacent second windings are arranged at intervals.

5. The anti-coupled inductor according to claim 1, characterized in that: One of the first winding and the second winding is in an Ω shape, and the other is in an inverse Ω shape; The first winding and the second winding are combined into a circle on the projection plane; the curved anti-coupling sections corresponding to the first winding and the second winding overlap an arc on the projection plane; The first winding is a symmetrical structure along the central axis; The second winding is a symmetrical structure along the central axis.

6. The anti-coupled inductor according to claim 5, characterized in that: The first winding includes a first anti-coupling segment and a second anti-coupling segment, and the first anti-coupling segment and the second anti-coupling segment are in positive and negative S shapes relative to each other; The first winding comprises a positive coupling segment, wherein the positive coupling segment is connected between the first anti-coupling segment and the second anti-coupling segment to form an integral continuous arc; the first anti-coupling segment, the second anti-coupling segment and the positive coupling segment are coplanar; The second winding includes a first anti-coupling segment and a second anti-coupling segment, and the first anti-coupling segment and the second anti-coupling segment are in positive and negative S shapes relative to each other; The second winding comprises a positive coupling segment, wherein the positive coupling segment is connected between the first anti-coupling segment and the second anti-coupling segment to form an integral continuous arc; the first anti-coupling segment, the second anti-coupling segment and the positive coupling segment are coplanar; The first winding and the second winding, their first anti-coupling sections overlap and are located on the same side of the circle of the projection surface; the first winding and the second winding, their second anti-coupling sections overlap and are located on the other side of the circle of the projection surface; the first winding and the second winding, their positive coupling sections are respectively located at opposite ends of the circle of the projection surface.

7. The anti-coupled inductor according to claim 1, characterized in that: The first winding and the second winding are both planar or flat plate structures as a whole; The first winding and the second winding each include a main body and a pair of pins on both sides of the main body; the main body and the pins are coplanar; The two pins of each of the first winding and the second winding are exposed to two opposite end surfaces of the magnetic core and / or two opposite sides of the same end surface, so as to be electrically connected to the circuit board; The first winding and the second winding are arranged in parallel front and back; the main body of the first winding is relatively bent downward, and the pins on both sides of the main body extend downward from the top relatively, and the two pins are parallel to each other and coplanar; The main body of the second winding is bent and extended upwards relatively, and pins on both sides of the main body are extended downwards relatively from the bottom.

8. The anti-coupled inductor according to claim 6, characterized in that: A pair of pins of the first winding are long pins; two pins of the second winding are short pins; a long pin of the first winding and a short pin of the second winding are located in parallel on the same side, and are exposed at the same end surface and / or the same side edge of the magnetic core, and are spaced apart from each other, so as to be electrically connected to the circuit of the circuit board; another long pin of the first winding and another short pin of the second winding are located in parallel on the same side, and are exposed at the other opposite end surface of the magnetic core and / or the other opposite side edge of the same end surface, and are spaced apart from each other, so as to be electrically connected to the circuit of the circuit board.

9. The anti-coupled inductor according to any one of claims 1 to 8, characterized in that: The multiple windings include two adjacent first windings and two adjacent second windings, and the two adjacent first windings and the two adjacent second windings are arranged in the magnetic core at intervals; the two adjacent first windings are insulated from each other, and the two adjacent second windings are insulated from each other.

10. The anti-coupled inductor according to claim 9, characterized in that: Two adjacent first windings are nested inside and outside, one large and one small, and close to each other; two adjacent second windings are nested inside and outside, one large and one small; or, two adjacent first windings are parallel and close to each other, and two adjacent second windings are parallel and close to each other, and the two adjacent first windings and the two adjacent second windings are four parallel conductors; Among them, one group of first windings and second windings are used as main windings, and another group of first windings and second windings are auxiliary windings, and the auxiliary windings are connected in series inside the circuit board or the magnetic core.

11. A power supply comprising a circuit board, characterized in that: The power supply further comprises the anti-coupling inductor according to any one of claims 1 to 10, and the anti-coupling inductor is electrically connected to the circuit board.

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