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 insulated from each other; each of the first winding and the second winding comprises a reverse coupling section and a positive coupling section which are correspondingly arranged; after the inductance access circuit board accesses current, the current directions of the first winding and the second winding in the anti-coupling section are opposite, and magnetic fields in opposite directions are generated to achieve the effect that the magnetic fields counteract each other; the current directions in the positive coupling sections corresponding to the first winding and the second winding are the same; and the coupling coefficient of the inductor is controlled by controlling the length of the anti-coupling part. The power supply comprises a circuit board and an anti-coupling inductor electrically connected with the circuit board. The current in the same direction is changed into the current in the reverse direction by using a physical structure 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] This application relates to the technical field of electronic components, and 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 larger and the conversion efficiency requirements are getting higher. The reasonable and effective layout of various components on the PCB board becomes increasingly 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 in fields such as automotive electronics and aerospace. Inductive components are usually the largest and heaviest in volume in DC-DC module power supplies. Therefore, the structure and arrangement of the inductor 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 a 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, increasing the current ripple and causing 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 Invention

[0003] The main purpose of this application is to provide an anti-coupling inductor to solve the problem of the mutual inductance phenomenon caused by positive coupling in existing magnetically integrated inductors.

[0004] Another purpose of this application is to provide a power supply to solve the problems of current loss or system instability caused by positive coupling in existing power supplies due to their magnetically integrated inductors.

[0005] To achieve the above purposes, this application adopts the following technical solutions:

[0006] An anti-coupling inductor includes a magnetic core and a plurality of windings disposed within the magnetic core. The plurality of windings include a first winding and a second winding that are spaced apart from each other, and the first winding and the second winding are insulated from each other. Each of the first winding and the second winding includes a corresponding anti-coupling section and a positive-coupling section. After the inductor is connected to a circuit board and a current is applied, the current directions in the anti-coupling sections of the first winding and the second winding are opposite and generate magnetic fields in opposite directions to achieve the effect of mutual cancellation of the magnetic fields. The current directions in the corresponding positive-coupling sections of the first winding and the second winding are the same. The coupling coefficient of the inductor is controlled by controlling the length of the anti-coupling portion.

[0007] Further, the first winding and the second winding are respectively formed by bending a conductor into a horizontal section and a vertical section, with pins formed on both sides. The horizontal sections of the first winding and the second winding are correspondingly arranged, and the vertical sections of the first winding and the second winding are correspondingly arranged. When the current flows into the pins on the same side of the first winding and the second winding, the corresponding horizontal sections serve as the positive-coupling sections, and the corresponding vertical sections serve as the anti-coupling sections. When the current flows into the pins on different sides of the first winding and the second winding, the corresponding horizontal sections serve as the anti-coupling sections, and the corresponding vertical sections serve as the positive-coupling sections.

[0008] In some embodiments, the first winding and the second winding are deformed U-shaped windings. The corresponding vertical sections of the first winding and the second winding coincide on the projection plane. The first winding and the second winding are the same windings. The first winding and the second winding are arranged in the magnetic core in opposite directions. The first winding and the second winding are parallel to each other front and back.

[0009] In some embodiments, the first winding and the second winding are in the shape of "nai". The first winding and the second winding are respectively formed by bending a conductor into a top horizontal section, a bottom horizontal section, and a vertical section connecting the top horizontal section and the bottom horizontal section. The top horizontal section of the first winding is arranged parallel to and above and below the bottom horizontal section of the second winding. The top horizontal section of the second winding is arranged parallel to and above and below the bottom horizontal section of the first winding.

[0010] In some embodiments, a predetermined angle is formed between the vertical section and the top horizontal section and the bottom horizontal section. The bottom horizontal section, the vertical section, and the top horizontal section are all straight lines. The first winding and the second winding are both formed by bending a single conductor. The anti-coupling inductor is applied to a two-phase or multi-phase parallel interleaved circuit. A pair of 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 board.

[0011] In some embodiments, a pair of pins of the first winding and the second winding are respectively exposed at two opposite end faces of the magnetic core and / or two opposite sides of the same end face, and are extended by providing leads or plating conductive layers on the end faces of the magnetic core to be electrically connected to the circuit board; or, the pins of the first winding and the second winding extend from the inside of the magnetic core toward the direction of the solder pins on the circuit board, and are connected to the corresponding solder pins on the circuit board through the surface of the magnetic core.

[0012] In some embodiments, the surfaces of the first winding and the second winding are covered with an insulating film to achieve mutual insulation; or, the first winding and the second winding are filled with insulating magnetic core powder and then integrally formed to achieve mutual insulation; the anti-coupling inductor is multi-way coupled integrated, and the multi-coupled winding is: the first winding and the second winding are arranged in a spaced manner, or are spaced between two adjacent first windings and two adjacent second windings.

[0013] In some embodiments, 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.

[0014] In some embodiments, two adjacent first windings are nested inside and outside, one large and one small, and are 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 front and back, and two adjacent second windings are parallel and close to each other front and back, and the two adjacent first windings and the two adjacent second windings are four parallel conductors; wherein, 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.

[0015] A power supply comprises a circuit board and an anti-coupling inductor, wherein the anti-coupling inductor is electrically connected to the circuit board.

[0016] The beneficial effects of this application are:

[0017] The anti-coupling inductor of the present application utilizes the physical structure of a dual-coupled winding to convert currents in the same direction into currents in opposite directions so as to achieve the effect of mutual cancellation of magnetic fields, i.e., anti-coupling, thereby reducing electromagnetic interference and improving system stability; the anti-coupled magnetic fields cancel each other out, i.e., reducing the loss caused by the mutual inductance phenomenon, reducing current ripple, and improving efficiency; the anti-coupling characteristic reduces the inductance of the superimposed mutual inductance, thereby improving the dynamic response characteristics.

[0018] The magnetic core of the present application has a high-density characteristic, and the magnetic core and the winding are tightly combined, which has good heat conduction and heat dissipation effects, so that it can maintain a low operating temperature.

[0019] Furthermore, the structures of the two windings in this application are the same, the structure of the winding is simple, the technological process of manufacturing the winding is simple, it is easy to be implemented automatically, and the cost is relatively low. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1-2 is a perspective view of the anti-coupling inductor of the first embodiment of this application from different perspectives.

[0021] Figure 3-5 is a perspective view of the anti-coupling inductor of the first embodiment of this application in different directions.

[0022] Figure 6-7 is a perspective view of the winding of the first embodiment of this application.

[0023] Figure 8 is an application circuit diagram of the anti-coupling inductor of the first embodiment of this application.

[0024] Figure 9 is a perspective view of the multi-way coupling inductor of the first embodiment of this application.

[0025] Figure 10 is a perspective view of the winding of the second embodiment of this application.

[0026] Figure 11 is a perspective view of the anti-coupling inductor of the second embodiment of this application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] Hereinafter, the exemplary embodiments of this application will be described in more detail with reference to the drawings. Although the exemplary embodiments of this application are shown in the drawings, it should be understood that this 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 this application can be more thoroughly understood and the scope of this application can be fully conveyed to those skilled in the art.

[0028] 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 performance is explicitly stated. It should also be understood that additional or alternative steps may be used.

[0029] Although terms such as first and second 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. 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.

[0030] 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 "inside," "outside," "inner side," "outer side," "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 upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used herein are to be interpreted accordingly.

[0031] Please refer to Figure 1-9 As shown, the present application 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, which may be achieved by the magnetic core 3, that is, 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 by coating an insulating film on the surface of the windings to achieve mutual insulation between the windings.

[0032] 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. The first winding 1 and the second winding 2 are respectively formed by winding conductors into zigzag windings, and each includes an anti-coupling section. When the inductor 100 is connected to a circuit and current is applied to the first winding 1 and the second winding 2, in their corresponding anti-coupling sections, the current directions are opposite and the magnetic field directions are opposite, thereby achieving magnetic field anti-coupling. The coupling coefficient of the inductor is controlled by controlling the size and / or position of the anti-coupling section to achieve the desired degree of anti-coupling.

[0033] Both the first winding 1 and the second winding 2 include positive coupling sections. 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 (for example, referring to Figure 3 and Figure 4 , when the currents of the first winding 1 and the second winding 2 flow in from the same-side pins 11 and 21 and flow out from the same-side pins 12 and 22), to control the degree of anti-coupling and reduce positive coupling.

[0034] Figure 1-9 As shown in the anti-coupling inductor 100 of the first embodiment, the first winding 1 and the second winding 2 each include a correspondingly arranged anti-coupling section and positive coupling section; after being connected to the circuit, the currents in the anti-coupling sections of the first winding 1 and the second winding 2 are in opposite directions, generating magnetic fields in opposite directions that cancel each other out; the current directions in the corresponding positive coupling sections are the same; the coupling coefficient of the inductor is controlled by controlling the length of the anti-coupling part.

[0035] Specifically, taking the example where the currents of the first winding 1 and the second winding 2 flow in from the same side and flow out from the same side for illustration. The first winding 1 and the second winding 2 respectively include 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. Among them, the body 10 of the first winding 1 includes an anti-coupling section 14, and the body 20 of the second winding 2 includes an anti-coupling section 24. When the inductor 100 is connected to the circuit of the circuit board and is conducting, the current flows in the anti-coupling sections 14 and 24 in opposite directions, forming an anti-coupling part. It can be understood that the circuit board can be a PCB board.

[0036] In a non-limiting example, the anti-coupling segments 14 of the first winding 1 and the anti-coupling segments 24 of the second winding 2 are arranged parallel to each other, close to each other before and after, with the same length and aligned, and the current directions therein are opposite. After the inductor 100 is connected to the circuit of the circuit board and conducts electricity, the current flows in the corresponding same direction in the other segments of the first winding 1 and the second winding 2 of the dual-coupling winding except for the anti-coupling part. The first winding 1 and the second winding 2 of the dual-coupling winding of the inductor 100 also correspondingly include positive-coupling segments, where the current flows in the same direction and they are mutually coupled to form a positive-coupling part. The physical positions between the positive-coupling segments are set according to the principle of being relatively far apart, so as to reduce the coupling. For example, the positive-coupling segments with the same current direction in the first winding 1 and the second winding 2 are configured to have different lengths and / or different in two spatial dimensions. For example, the corresponding positive-coupling segments with the same current direction in the two windings have two different-dimensional orientations among above / below, left / right, or front / back, so that the distance between the corresponding positive-coupling segments with the same current direction in the two windings is far, so as to reduce the coupling. After the inductor 100 is connected to the circuit of the circuit board, the current of the first winding 1 and the second winding 2 flows in from the same side and out from the same side, as Figure 8 shown by the current directions of the first winding (L1) 1 and the second winding (L2) 2 in the dual-coupling winding shown in the figure. 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 application is mainly applied to two-phase or multi-phase parallel interleaved circuits.

[0037] As a non-limiting embodiment, referring again to Figure 1-7 , in the orientation shown in the figure, the first winding 1 and the second winding 2 of the dual-coupling winding are arranged at intervals parallel to each other before and after. The second winding 2 is the front winding, and the first winding 1 is the rear winding. The first winding 1 and the second winding 2 are completely identical (not limited to being completely identical) windings, and are located inside the magnetic core 3 in opposite left and right directions. The first winding 1 and the second winding 2 are deformed U-shaped windings. The winding body is bent by a section to form anti-coupling segments 14 and 24, which are aligned parallel to each other before and after, up and down. After being energized, the current directions are opposite, and correspondingly generate magnetic fields in opposite directions, which cancel each other out, that is, reduce the loss caused by the mutual inductance phenomenon (magnetic field superposition), reduce the current ripple, and improve the efficiency. The other segments of the first winding 1 and the second winding 2 are arranged left and right inside the magnetic core 3 to correspondingly form positive-coupling segments.

[0038] Exemplarily, the first winding 1 and the second winding 2 are U-shaped with one side bent, for example, bent vertically (not limited to a vertical angle, it can be other predetermined angles) along the midline position to form a "nai" shape, and the vertical segments along the midline direction are the anti-coupling segments 14 and 24. After the circuit of the inductor 100 is turned on, the current directions in the anti-coupling segments 14 and 24 are opposite. The first winding 1 and the second winding 2 are deformed U-shaped windings, the main body segments form bent portions (such as vertical bends), and a pair of pins on both sides of the U shape are parallel to each other, and are set as a long pin and a short pin. It should be noted that the shapes of the windings mentioned in this application as U-shaped and "nai" shaped are similar to U-shaped and "nai" shaped, but not exactly the same.

[0039] Specifically, the first winding 1 includes a long pin 11 and a short pin 12. The winding body includes a top horizontal positive coupling segment 13, a middle vertical segment which is the anti-coupling segment 14 (bent along the midline direction) and is parallel to the pins 11 / 12, and a bottom horizontal positive coupling segment 15. The short pin 12 is connected to the end of the bottom horizontal positive coupling segment 15, perpendicular to each other (not limited to perpendicular, it can also be other predetermined angles), and the long pin 11 is connected to the end of the top horizontal positive coupling segment 13, perpendicular to each other (not limited to perpendicular, it can also be other predetermined angles). The long pin 11 and the short pin 12 are parallel (or not parallel) to each other, and the ends are flush (not limited to flush).

[0040] The second winding 2 is the same as the first winding 1. Correspondingly, the second winding 2 includes a long pin 22 and a short pin 21. The winding body includes a top horizontal positive coupling segment 23, a middle vertical segment which is the anti-coupling segment 24 (bent along the midline direction) and is parallel to the pins 21 / 22, and a bottom horizontal positive coupling segment 25. The short pin 21 is connected to the end of the bottom horizontal positive coupling segment 25, perpendicular to each other (not limited to perpendicular, it can also be other predetermined angles), and the long pin 22 is connected to the end of the top horizontal positive coupling segment 23, perpendicular to each other (not limited to perpendicular, it can also be other predetermined angles). The long pin 22 and the short pin 21 are parallel (or not parallel) to each other, and the ends are flush (not limited to flush).

[0041] The magnetic core 3 is preferably integrally formed. Specifically, several windings (such as the first winding 1 and the second winding 2 of the double-coupling winding) are placed in a mold, filled with insulating magnetic core powder, and pressure is applied for molding. The molding pressure can be 12~24T / cm 2 , to obtain a green inductor with the windings buried inside the magnetic core part and the pins exposed on the surface of the magnetic core; the green inductor is placed in a heat treatment furnace and heated and kept warm to release the residual stress inside the green inductor, and the inductor device 100 of this application embodiment is obtained. The annealing temperature can be 400~850°C.

[0042] 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, iron-nickel alloy powder, or iron-based amorphous powder, etc.

[0043] It is formed by co-firing and pressing the insulating magnetic core powder and the winding in the mold. The insulating magnetic core powder material is closely distributed between the windings to form a proper spacing to achieve the insulation effect; and it makes the magnetic core and the winding in full contact to achieve rapid heat transfer; the high-pressure forming makes there be no gap inside the whole inductor device to achieve full space utilization and realize high power density. The insulating magnetic core powder and multiple windings are co-fired and pressed to save volume and achieve small volume and high power density.

[0044] The magnetic core 3 includes an end face 33 and end faces 31, 32 on both sides of the end face 33 and adjacent to the end face 33. One lead 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, it is exposed and extended from the two side end faces 31 or 32 so that the ends of the leads 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 opposite first end face 31 and second end face 32 (taking Figure 3 the shown orientation as the left and right surfaces), opposite fourth end 34 and third end face 33 (taking Figure 3 the shown orientation as the upper and lower surfaces) and opposite fifth end face 35 and sixth end face 36 (taking Figure 3The orientation shown is the front and rear surfaces). The inside of the magnetic core 3 is an integrally formed double-coupled winding, and the first winding 1 and the second winding 2 are in the shape of a positive and negative "乃" character, and are placed in parallel in front and back. The first winding 1 is located behind the second winding 2 and is spaced apart from each other. The pins of the first winding 1 and the second winding 2 are respectively exposed to the first end face 31 and the second end face 32 and the adjacent third end face 33 of the magnetic core 10. Specifically, the long pin 11 of the first winding 1 and the short pin 21 of the second winding 2 are arranged in parallel and spaced apart from each other, located on the same side (for example, the left side), and are exposed to the first end face 31 (for example, the left end face) of the magnetic core 3 and are arranged in parallel and spaced apart from each other, and the end face 110 / 210 of the pin 11 / 21 extends and is exposed to the left side of the third end face 33 (for example, the lower end face) of the magnetic core, and is arranged in parallel and spaced apart from each other, and the pin 11 / 21 is a straight line, extending toward the third end face (lower end face) 33 along the height direction of the end face 31. The short pin 12 of the first winding 1 and the long pin 22 of the second winding 2 are parallel to each other, located on the same side (e.g., the right side), and are exposed to the second end face 32 (i.e., the right end face) of the magnetic core 3 and are arranged in parallel and spaced apart from each other, and the end face 120 / 220 of the pin 12 / 22 extends and is exposed to the right side of the third end face 33 (i.e., the lower end face) of the magnetic core and is arranged in parallel and spaced apart from each other, and the pin 12 / 22 is a straight line, extending toward the third end face (lower end face) 33 along the height direction of the end face 32. Pins 11 / 21 are located on the same side of the third end face 33 (e.g., the left line of the lower end face of the magnetic core), and pins 12 / 22 are located on the other side of the third end face 33 (e.g., the right line of the lower end face of the magnetic core). Pins 11 / 21 and 12 / 22 are exposed to the surface of the magnetic core and keep the corresponding surface of the magnetic core flat. After the inductor 10 is connected to the circuit and turned on, the current direction in pins 11 / 21 is the same, and the current direction inside pins 12 / 22 is the same. It can be understood that the pins of the first winding 1 and the second winding 2 can also be exposed on the surface of the magnetic core only on the third end face 33, that is, the ends 110 / 210 of the pins 11 / 21 are exposed to one side of the end face 33 in parallel and spaced relation, and the ends 120 / 220 of the pins 12 / 22 are exposed to the other side opposite to the end face 33 in parallel and spaced relation; the four pin end faces are connected to form a square (same or different from the square of the magnetic core), and the pin end faces are located at the four corners 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 magnetic core. The pins are respectively exposed to the two opposite end faces of the magnetic core and / or the opposite sides of the same end face, so as to facilitate electrical connection with the pads on the circuit board. In other embodiments, a conductive layer can also be coated on the surface of the magnetic core along the exposed pins to expand the exposed area of ​​the pins to form pads, so as to facilitate welding with the corresponding pads of the circuit provided on the circuit board.

[0045] The main body 10 of the first winding 1 and the main body 20 of the second winding 2 are arranged inside the magnetic core 3. The top horizontal positive coupling section 13 of the main body 10 of the first winding 1 and the bottom horizontal positive coupling section 25 of the second winding 2 are positively coupled to each other, corresponding to being on the same side (for example, the left side), having the same length, being parallel to each other, spaced front and back, relatively located in the upper and lower positions, and the spacing distance between the upper and lower is corresponding to the height of the anti-coupling section, so as to increase the distance between the positive coupling sections 13 and 25 with the same current direction. The top horizontal positive coupling section 23 of the second winding 2 and the bottom horizontal positive coupling section 15 of the main body 10 of the first winding 1 are positively coupled to each other, having the same length, being parallel to each other, spaced front and back, relatively located in the upper and lower positions, and the spacing distance between the upper and lower is corresponding to the height of the anti-coupling section, so as to increase the distance between the positive coupling sections 15 and 23 with the same current direction. The anti-coupling part of the double-coupling winding corresponds to the middle (along the center line direction) vertical anti-coupling section 14 of the main body 10 of the first winding 1 and the middle (along the center line direction) vertical anti-coupling section 24 of the main body 10 of the second winding 2 having the same length, being parallel and aligned front and back, coinciding on the projection plane, and being parallel to the pins. After the inductor 10 is connected to the circuit and conducts electricity, the current directions inside the positive coupling sections 13 / 25 are the same to form a positive coupling part, and the current directions inside the positive coupling sections 15 / 23 are the same to form a positive coupling part; the current directions inside the anti-coupling sections 14 / 24 are opposite to form an anti-coupling part.

[0046] The cross-sectional shapes of the first winding 1 and the second winding 2 can be, but are not limited to, circular, rectangular, etc.

[0047] In the above embodiment, the main body 10 of the first winding 1 and the main body 20 of the second winding 2 bend the coupling sections (i.e., the top horizontal positive coupling section and the bottom horizontal positive coupling section) along the center line and divide them into two equal parts on both sides. The bent section along the center line serves as the anti-coupling section, which is perpendicular to the horizontal positive coupling sections on both sides and connects the horizontal coupling sections on both sides. The anti-coupling sections and positive coupling sections of the first winding 1 and the second winding 2 are both straight lines, and the pins are also straight lines. In other embodiments, the main body 10 of the first winding 1 and the main body 20 of the second winding 2 can be bent along multiple equal division lines to form multiple horizontal positive coupling sections and multiple anti-coupling sections. The purpose of bending is to obtain the anti-coupling section and increase the distance between the positive coupling sections connected to both sides of the anti-coupling section.

[0048] In other embodiments, referring to Figure 9 , inside the magnetic core 3, another second winding 2 is arranged behind the first winding 1, and / or, another 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 every two adjacent first windings 1 and second windings 2 are the same as those of the above double-coupling embodiment, and there is an anti-coupling part between each pair of double-coupling windings. Thus, a multi-coupling inductor is obtained.

[0049] Referring to Figure 10-11, 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 a magnetic core 3. Among them, windings 1 and 2 are main windings, and 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. An anti-coupling and a positive coupling are formed between the two adjacent first windings 1, 1' and the two adjacent second windings 2, 2'. In the first embodiment, the first winding pair 1 and the second winding 2 as a whole are in a "nai" shape, arranged in the magnetic core 3 in a positive and negative manner, corresponding to four pins 11, 12, 21, 22, which are exposed on two opposite end faces 31 / 32 of the magnetic core 3 and / or on opposite sides of the same end face 33 to be electrically connected to the circuit of the circuit board; while in this embodiment, the two adjacent first windings 1, 1' are two "nai" shaped conductors, and the two adjacent second windings 2, 2' are two reverse "nai" shaped conductors, corresponding to 8 pins 11 / 11', 12 / 12', 21 / 21', 22 / 22', which are respectively exposed on two opposite end faces 31 / 32 of the magnetic core 3 and / or on opposite sides of the same end face 33, that is, the pins 11 / 11', 21 / 21' for input current are exposed on one side of the end face 31 and the end face 33, and the pins 12 / 12', 22 / 22' for output current are exposed on the other side of the opposite end face 32 and the end face 33. Windings 1' and 2' are auxiliary windings, and the auxiliary windings 1' and 2' are connected in series inside the circuit board or the magnetic core 3. The pins of windings 1 and 2 correspond to the solder feet of the TLVR circuit. For example, pins 11 and 21 are respectively connected to the switching units at the input end, pins 12 and 22 are electrically connected and used as a common output end to be connected to the load, pin 11' is connected to the compensation inductor Lc, and pin 12' is electrically connected to pin 21'. 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.

[0050] The two adjacent first windings 1, 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 the magnetic core 3 (that is, magnetic core powder is filled between the two adjacent first windings 1, 1'), and each includes a top horizontal positive coupling section 13 / 13', a middle vertical anti-coupling section 14 / 14', and a bottom horizontal positive coupling section 15 / 15'. The two adjacent second windings 2, 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 the magnetic core 3 (that is, magnetic core powder is filled between the two adjacent second windings 2, 2'), and each includes a top horizontal positive coupling section 23 / 23', a middle vertical anti-coupling section 24 / 24', and a bottom horizontal positive coupling section 25 / 25'. The conductors of windings 1 / 1' and 2 / 2' are also insulated from each other by the magnetic core 3.

[0051] 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 covering the surface of the conductor. Mutual insulation is also achieved between two adjacent first windings 1 and 1' and between two adjacent second windings 2 and 2' by the insulating layer on the conductor surface, and then they are assembled inside the magnetic core 3.

[0052] For the windings inside the anti-coupling inductor 100 of the second embodiment, two adjacent first windings 1 and 1' overlap and nest vertically, one larger and one smaller, and are close to each other; two adjacent second windings 2 and 2' overlap and nest vertically, one larger and one smaller, 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 parallel in the front and back, and their sizes can be the same or different; two adjacent second windings 2 and 2' can also be close to each other parallel in the front and back, and their sizes can be the same or different; at this time, two adjacent first windings 1 and 1' and two adjacent second windings 2 and 2' are four parallel conductors.

[0053] In the above embodiments, when the anti-coupling inductor 100 is welded to the circuit board and current is switched on, the current flows in from the same side, for example, from one side of the end face 31 or end face 33 of the magnetic core 3, that is, from the same-side pins 11 and 21 of the first winding 1 and the second winding 2, and flows out from the other side, such as the other side of the opposite end face 32 or end face 33, that is, from the same-side pins 12 and 12 of the first winding 1 and the second winding 2; the middle vertical section conductor 14 of the first winding 1 and the middle vertical sections 24 of the two second windings 2 are anti-coupling sections, and the internal current directions are opposite, generating magnetic fields in opposite directions that cancel each other out; the horizontal sections 13 and 15 of the first winding 1 and the horizontal sections 25 and 23 of the second winding 2 are positive-coupling sections, corresponding to form positive coupling.

[0054] In other embodiments, the current flows in and out from the opposite end faces of the anti-coupling inductor 100, such as end faces 31 and 32 or the opposite sides of the end faces, that is, the current flows into the two windings from one pin 11 and 22 on both sides of the first winding 1 and the second winding 2, and flows out from the other pin 12 and 21 on both sides. At this time, the middle vertical section conductor 14 of the first winding 1 and the middle vertical sections 24 of the two second windings 2 are positive-coupling sections, and the internal current directions are the same, generating positive coupling; the horizontal sections 13 and 15 of the first winding 1 and the horizontal sections 25 and 23 of the second winding 2 are anti-coupling sections, and the internal current directions are opposite, generating magnetic fields in opposite directions that cancel each other out. It can be understood that referring to Figure 3 and Figure 4, when the currents of the first winding 1 and the second winding 2 flow in from different sides and flow out from different sides, for example, the current of the first winding 1 flows from pin 11 to pin 12, and the current of the second winding 2 flows from pin 22 to pin 21. Since the pins only extend vertically to the end face 33 and are exposed to the end face 33, in the application of the DC-DC converter, the switching circuit connecting the two windings will be located on different sides. Therefore, in other embodiments, pin 11 is exposed to the end face and extends between pin 12 and pin 22, and pins 12, 21, and 22 all extend along this direction and are arranged parallel to each other on the end face 33, so that the switching circuit is located on the same side to simplify the overall circuit layout.

[0055] In addition, the parts of pins 11 / 12 and 21 / 22 of the first winding 1 and the second winding 2 exposed on the surface of the magnetic core extend the current input and output ends of the pins by means of electroplating extension or lead connection, which are adapted to the positions of the solder pads on the circuit board, so as to realize the way of current inflow and outflow on the same side / different sides or the same end face / different end faces, or change the direction of current flowing into and out of the first winding 1 and the second winding 2. Or, in some embodiments, according to the layout of the circuit board pads, the extension directions of pins 11 / 12 and 21 / 22 of the first winding 1 and the second winding 2 from the winding bodies 10 and 20 are correspondingly changed to realize the current input and output ends. For example, pins 11 / 12 and 21 / 22 extend from the corresponding winding bodies to be distributed on the same side.

[0056] The anti-coupling inductor 100 of the present application has the following characteristics:

[0057] 1) Utilize the physical structure of the winding to change the current in the same direction into the current in the opposite direction to achieve the effect of mutual cancellation of magnetic fields (i.e., anti-coupling), thereby reducing electromagnetic interference and improving the stability of the system;

[0058] 2) The anti-coupling magnetic fields cancel each other out, that is, reduce the loss caused by the mutual inductance phenomenon (magnetic field superposition), reduce the current ripple, and improve the efficiency;

[0059] 3) The anti-coupling characteristic of the winding in the present application reduces the inductance of the mutual inductance superposition, so the dynamic response characteristic is improved. (Small inductance is beneficial to the dynamic response);

[0060] 4) In the embodiment of the present application, the inductance obtained by co-firing and pressing the insulating magnetic core powder and the winding in the mold is integrally formed. The magnetic core and the winding are tightly combined, so it has good heat conduction and heat dissipation effects, and keeps the working temperature low; 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 to make the magnetic core and the winding fully contact to achieve rapid heat transfer; high-pressure forming makes there be no gap inside the whole device to achieve full space utilization and realize high power density;

[0061] 5) In the embodiments of the present application, the two windings have the same structure, the structure of the winding is simple, the technological process of manufacturing the winding is simple, it is easy to implement automatically, and the cost is relatively low.

[0062] The present application also provides a power supply, which includes a circuit board and the anti-coupling inductor 100 of the above embodiments. 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, the circuit on the circuit board is a two-phase or multi-phase parallel interleaved circuit, the current flows in from the same side of the inductor 100 and flows out 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.

[0063] Although the embodiments of the present application have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present application. The protection scope of the present application is defined by the appended claims and their equivalent scope.

Claims

1. An anti-coupling inductor, comprising a magnetic core and a plurality of windings arranged within the magnetic core, characterized in that: 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; each of the first winding and the second winding includes a corresponding anti-coupling section and a positive-coupling section; after the inductor is connected to a circuit board and a current is applied, the current directions in the anti-coupling sections of the first winding and the second winding are opposite and generate magnetic fields with opposite directions to achieve the effect of mutual cancellation of the magnetic fields; the current directions in the corresponding positive-coupling sections of the first winding and the second winding are the same; the coupling coefficient of the inductor is controlled by controlling the length of the anti-coupling part.

2. The anti-coupling inductor according to claim 1, characterized in that: The first winding and the second winding are respectively formed by bending a conductor into a horizontal section and a vertical section, with leads formed on both sides; the horizontal sections of the first winding and the second winding are correspondingly arranged, and the vertical sections of the first winding and the second winding are correspondingly arranged; When the current flows in from the leads on the same side of the first winding and the second winding, the corresponding horizontal section serves as the positive-coupling section, and the corresponding vertical section serves as the anti-coupling section; When the current flows in from the leads on different sides of the first winding and the second winding, the corresponding horizontal section serves as the anti-coupling section, and the corresponding vertical section serves as the positive-coupling section.

3. The anti-coupling inductor according to claim 2, characterized in that: The first winding and the second winding are deformed U-shaped windings; The corresponding vertical sections of the first winding and the second winding coincide on the projection plane; The first winding and the second winding are identical windings; the first winding and the second winding are arranged in the magnetic core in opposite directions; The first winding and the second winding are parallel to each other front and back.

4. The anti-coupling inductor according to claim 2, characterized in that: The first winding and the second winding are in the shape of "nai"; The first winding and the second winding are respectively formed by bending a conductor into a top horizontal section, a bottom horizontal section, and a vertical section connecting the top horizontal section and the bottom horizontal section; The top horizontal section of the first winding is arranged parallel to and above and below the bottom horizontal section of the second winding; the top horizontal section of the second winding is arranged parallel to and above and below the bottom horizontal section of the first winding.

5. The anti-coupling inductor according to claim 4, characterized in that: A predetermined angle is formed between the vertical section and the top horizontal section and the bottom horizontal section; The bottom horizontal section, the vertical section, and the top horizontal section are all straight lines; Both the first winding and the second winding are formed by bending a single conductor; The anti-coupling inductor is applied to a two-phase or multi-phase parallel interleaved circuit; A pair of leads 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 board.

6. The anti-coupling inductor according to claim 2, characterized in that: A pair of leads 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, and are extended out by means of arranging leads or plating a conductive layer on the end face of the magnetic core to be electrically connected to the circuit board; or The pins of the first winding and the second winding extend from the inside of the magnetic core toward the soldering pins on the circuit board, pass through the surface of the magnetic core, and are correspondingly connected to the soldering pins on the circuit board.

7. The anti-coupled inductor according to claim 2, characterized in that: The surfaces of the first winding and the second winding are covered with an insulating film to achieve mutual insulation; or, the first winding and the second winding are filled with insulating magnetic core powder and then integrally formed to achieve mutual insulation; The anti-coupling inductor is a multi-way coupling integration, and the multi-way coupling winding is arranged in a manner that a first winding and a second winding are arranged at intervals, or two adjacent first windings and two adjacent second windings are arranged at intervals.

8. The anti-coupled inductor according to any one of claims 1 to 7, 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.

9. The anti-coupled inductor according to claim 8, 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.

10. 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 9, and the anti-coupling inductor is electrically connected to the circuit board.

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