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 embedded 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 is formed by winding a conductor in a zigzag manner and comprises two zigzag sections in different directions; when current is connected to the first winding and the second winding, same-side input and same-side output are achieved, the directions of magnetic fields generated by the current in the magnetic core are opposite, and therefore magnetic field reverse coupling is achieved. The power supply comprises a circuit board and the anti-coupling inductor electrically connected with the circuit board. According to the anti-coupling inductor, anti-coupling is achieved, the coupling coefficient approaches 0, and the dynamic response characteristic is improved; and the anti-coupling magnetic fields are mutually offset, so that the loss caused by a mutual inductance phenomenon is reduced, the current ripples are reduced, and the efficiency is improved.

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] Coupled inductors are commonly used in multiphase power topologies to make full use of the technical advantage that the current ripples between phases are cancelled out by magnetic coupling. When using ordinary discrete inductors, the current ripple cancellation is generally only carried out at the output of a multiphase buck converter. When these inductors are magnetically coupled, the current ripple cancellation acts on all circuit elements (MOSFETs, inductor coils, PCB traces). Therefore, the switching operation of all phases only affects a single phase, thereby reducing the amplitude of the current ripple and doubling the frequency. Reducing the RMS of the current waveform helps to improve the power conversion efficiency, or reduce the magnetic components to obtain a faster transient response, and further reduce the output capacitance requirement.

[0003] A coupled inductor is an idealized model of coupled coils. When a coil passes through a changing current, an induced magnetic field will be established around it. If the magnetic fields of two coils interact with each other, it is said that these two coils have magnetic coupling. Two or more coils with magnetic coupling are called coupled coils. Currently, the mainstream magnetically integrated inductors are all positively coupled. There are two adjacent inductor elements that produce a coupling effect through mutual magnetic coupling. The current i1 flowing through the first coil and the current i2 flowing through the second coil are in the same direction. When the current i1 flowing through the first coil changes, it will cause an induced electromotive force in the inductor element through which i2 flows, thereby causing a change in i2, resulting in a positive coupling phenomenon. For the application topology of current products, the positively coupled inductor will cause the inductance values of the inductors to be superimposed on each other, reducing the dynamic response characteristics and increasing the losses. Summary of the Invention

[0004] The main purpose of this application is to provide an anti-coupling inductor to solve the problems that the existing magnetically integrated inductors generate positive coupling, resulting in mutual inductance phenomena, causing the inductance values of the inductors to be superimposed on each other, reducing the dynamic response characteristics and increasing the losses, etc.

[0005] Another purpose of this application is to provide a power supply to solve the problems that the existing power supply has current losses or system instability due to the positive coupling generated by its magnetically integrated inductor.

[0006] To achieve the above objectives, this application adopts the following technical solutions:

[0007] An anti-coupling inductor includes a magnetic core and multiple windings buried inside. The multiple 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 shape and include two zigzag segments with different directions. When current is applied to the first winding and the second winding, the input and output are on the same side, and the magnetic field directions generated by the current inside the magnetic core are opposite, thereby achieving magnetic field anti-coupling.

[0008] In some embodiments, the first winding and the second winding are arranged inside the magnetic core, and the pins of the windings are exposed on the end face of the magnetic core for electrical connection with the circuit board. The currents input into the first winding and the second winding are input coplanarly, output coplanarly, and the internal current directions are opposite.

[0009] In some embodiments, the coupling coefficient of the first winding and the second winding of the anti-coupling inductor is as low as 10 -2 orders of magnitude.

[0010] In some embodiments, the first winding and the second winding are centrosymmetric with respect to the center of the magnetic core.

[0011] In some embodiments, the anti-coupling inductor is a multi-coupling integration, and the multi-coupling windings are arranged in a manner where the first winding and the second winding are arranged at intervals, or where two adjacent first windings and two adjacent second windings are arranged at intervals.

[0012] In some embodiments, the surfaces of the first winding and the second winding are coated with an insulating material to achieve insulation from each other; and / or, the first winding and the second winding are insulated from the magnetic core, and insulating magnetic core powder is filled between and around each winding, and then they are jointly pressed to form an integrally molded magnetic integration structure.

[0013] In some embodiments, the first winding is in an S shape or a Z shape and includes two zigzag segments with opposite directions. The two ends form a first pin and a second pin. The first pin is exposed on the first end face of the magnetic core to form a current input end for electrical connection with the circuit board, and the second pin is exposed on the second end face of the magnetic core to form a current output end for electrical connection with the circuit board. The first end face and the second end face are opposite. The second winding is in an inverted S shape or an inverted Z shape and includes two zigzag segments with opposite directions. The two ends form a third pin and a fourth pin. The third pin is exposed on the first end face of the magnetic core to form a current input end for electrical connection with the circuit board, and the fourth pin is exposed on the second end face of the magnetic core to form a current output end for electrical connection with the circuit board.

[0014] In some embodiments, the first winding and the second winding are combined into two upper and lower circles on a projection plane;

[0015] The upper arc of the first winding body is opposite to the upper arc of the second winding body, and they are combined into an upper circle on a projection plane; the lower arc of the first winding body is opposite to the lower arc of the second winding body, and they are combined into a lower circle on a projection plane.

[0016] In some embodiments, the plurality of windings includes 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 first windings and the two adjacent second windings are insulated from each other.

[0017] In some embodiments, the two adjacent first windings are nested inside and outside, one large and one small, and are close to each other; the two adjacent second windings are nested inside and outside, one large and one small; or, the two adjacent first windings are parallel and close to each other front and back, the 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 second windings serves as the main winding, and the other group of first windings and the second group serves as the auxiliary winding, and the auxiliary winding is connected in series inside the circuit board or the magnetic core.

[0018] The present application also provides a power supply, including a circuit board and the anti-coupling inductor described in any one of the above embodiments, and the anti-coupling inductor is electrically connected to the circuit board.

[0019] The beneficial effects of the present application are:

[0020] The anti-coupling inductor of the present application realizes anti-coupling, the coupling coefficient approaches 0, improves the dynamic response characteristics; the anti-coupling magnetic fields cancel each other out, reduces the loss caused by the mutual inductance phenomenon, reduces the current ripple, and improves the efficiency.

[0021] The magnetic core of the present application is integrally formed and has a high-density characteristic. The magnetic core and the winding are tightly combined, having good heat conduction and heat dissipation effects, so that it maintains a low working temperature. High-voltage forming makes there be no gap inside the entire inductor device to achieve full space utilization and realizes high power density.

[0022] Furthermore, the two windings of the present application have a simple structure, the process of preparing the windings is simple, it is easy to be implemented automatically, and the cost is low. Description of the Drawings

[0023] Figure 1-2 It is a perspective view of the anti-coupling inductor of the first embodiment of the present application from different perspectives.

[0024] Figure 3 It is a perspective view of the anti-coupling inductor of the first embodiment of the present application.

[0025] Figure 4 It is a front view of the double-coupling windings inside the anti-coupling inductor of the first embodiment of the present application.

[0026] Figure 5 It is a perspective view of the first winding and the second winding of the dual-coupled windings in the anti-coupled inductor of the first embodiment of the present application.

[0027] Figure 6 It is a perspective view of the multi-coupled inductor of the first embodiment of the present application.

[0028] Figure 7 It is a magnetic field simulation diagram of the anti-coupled inductor of the first embodiment of the present application.

[0029] Figure 8 It is a magnetic field simulation diagram of the positive-coupled inductor of the comparative example.

[0030] Figure 9 It is a magnetic field simulation diagram of the coupled inductor of the second embodiment of the present application.

[0031] Figure 10 It is a perspective view of the anti-coupled inductor of the third embodiment of the present application.

[0032] Figure 11 It is a perspective view of the windings in the anti-coupled inductor of the third embodiment of the present application. Detailed implementation manners

[0033] 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.

[0034] 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 alternative or additional steps may be used.

[0035] 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.

[0036] For ease of description, spatial relative relationship terms may be used herein to describe the relationship of one element or feature shown in the figure to another element or feature, such relative relationship terms such as "left", "right", "up", "down", "front", "back", "inside", "outside", "bottom", "top", etc. Such spatial relative relationship terms are intended to include different orientations of the device in use or operation in addition to the orientations depicted in the figure. For example, if the device in the figure 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 the above and below 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.

[0037] Referring to Figure 1-11 , in which Figure 3-4 , 6 and Figure 10 are perspective views, which are illustrations in a state where the magnetic core is assumed to be transparent to show the internal winding structure. The present application relates to an anti-coupling inductor 100, including a magnetic core 3 and a double-coupled winding or a multi-coupled winding inside the magnetic core 3. The multi-coupled 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-coupled winding is 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 by the magnetic core 3. When the insulating magnetic core powder is integrally formed with the windings, the magnetic core powder fills the space between the windings to insulate each winding from the others. Alternatively, the windings are insulated from each other by coating an insulating film on the surface of the windings. In this case, the windings may be assembled inside the magnetic core 3.

[0038] The anti-coupling inductor 100 of the present application forms anti-coupling between the first winding 1 and the second winding 2 integrated in the magnetic core 3. Preferably, the first winding 1 and the second winding 2 form a full anti-coupling; after the inductor is connected to the circuit and energized, the current directions in the first winding 1 and the second winding 2 are opposite to form anti-coupling. The first winding 1 and the second winding 2 are formed by winding a single or multiple conductors in a zigzag manner, and each conductor includes zigzag segments with different zigzag directions, and the zigzag segments in different directions are connected to each other. For example, two arc-shaped and / or curved segments with opposite zigzag directions are connected to form an S shape (including not exactly the same as the S shape) or a Z shape (including not exactly the same as the Z shape). The coupling coefficient and inductance can be controlled by controlling the size / length of the arc or curve of the winding body.

[0039] Figure 1-7 The anti-coupling inductor 100 of the first embodiment shown, wherein the first winding 1 is an S-shaped (including not exactly the same as the S shape) winding with an integral structure, and is formed by bending a single conductor such as a copper wire into two zigzag segments with different directions. The second winding 2 is an anti-S-shaped (including not exactly the same as the anti-S shape) with an integral structure, and is formed by bending a single conductor such as a copper wire into two zigzag segments with different directions. The two windings 1 and 2 are centrosymmetric with respect to the center of the magnetic core 3. Each winding includes a winding body and pins. The first winding 1 includes a winding body 10 and a pair of pins 11, 12, and the second winding 2 includes a winding body 20 and a pair of pins 21, 22. The windings of the first winding 1 and the second winding 2 form a full anti-coupling; after the inductor is connected to the circuit and energized, the current directions of the first winding 1 and the second winding 2 are opposite to form anti-coupling. The main body segments of the first winding 1 and the second winding 2 are arc-shaped and / or curved in different directions, and the coupling coefficient and inductance can be controlled by controlling the size / length of the arc or curve of the winding body.

[0040] An anti-coupling inductor 100 of the present application, as Figure 3 shown, when the first winding 1 passes through a current i1 and the second winding 2 passes through a current i2, the magnetic field directions generated by the two currents inside the magnetic core are opposite, so as to achieve magnetic field anti-coupling. The anti-coupling magnetic fields cancel each other out, reducing the loss caused by the mutual inductance phenomenon (magnetic field superposition), reducing the current ripple, and improving the efficiency.

[0041] In a specific embodiment of the dual-coupling inductor, the anti-coupling inductor 100 includes a magnetic core 3 and a first winding 1 and a second winding 2 embedded in the magnetic core 3. The first winding 1 and the second winding 2 are arranged front and back, parallel to each other, and centrosymmetric with respect to the center of the magnetic core 3. The first winding 1 is a positive S shape, and the second winding 2 is an anti-S shape; it can also be understood that when making two windings in the S shape and integrally molding with the soft magnetic powder or assembling in the magnetic core 3, the first winding and the second winding are arranged in the magnetic core 3 in a way that one is arranged forward and the other is arranged upside down.

[0042] The first winding 1 includes a zigzag main body 10 in the middle and a first pin 11 and a second pin 12 extending in opposite directions on the upper and lower sides (upper and lower positions relative to the illustrated direction). For example, in the illustrated direction, the first pin 11 is located at the bottom and extends to the left side or the first end face (such as the left end face) 31 of the magnetic core 3; the second pin 12 is located at the top and extends to the right side or the second end face (right end face) 32 of the magnetic core 3, and the first end face 31 of the magnetic core is opposite to the second end face 32. The first pin 11 and the second pin 12 can be arranged in a straight line and are parallel to each other up and down (not limited to parallel). The entire first winding 1 is formed by bending a single piece of conductor (such as a copper conductor). The bending degree of the zigzag main body 10 in the middle can be adjusted to adjust the length of the zigzag main body, and the zigzag main body 10 can be formed by connecting two opposite arcs (including arcs or curves similar to arcs) up and down.

[0043] By way of non-limiting example, the main body 10 of the first winding 1 and its two pins 11, 12 are coplanar. Therefore, the entire first winding 1 is a planar or flat plate structure. The cross-section of the conductor winding the first winding is the same. The conductor is bent along its length to form the main body 10 of the first winding 1 and the pins 11, 12, and the thickness of each part of the winding is the same. The outer surface of the first pin 11 is exposed to the third end face (such as the bottom face) 33 of the magnetic core 3 and is flush with the third end face. The end face of the first pin 11 is located at the first end face 31 and is flush with the first end face 31, serving as the input end of the first winding 1 and being electrically connected to the circuit on the circuit board. The outer surface of the second pin 12 is exposed to the fourth end face 34 and is flush with the fourth end face 34. The end face of the second pin 12 is located at the second end face 32 and is flush with the second end face 32, serving as the output end of the first winding 1 and being electrically connected to the circuit on the circuit board. The third end face 33 is opposite to the fourth end face 34 and is located between the first end face 31 and the second end face 32 and is an adjacent end face. It can be understood that only the end faces (input end and output end) of the first pin and the second pin can be exposed to the first end face 31 or the second end face 33 of the magnetic core, and other parts of the pins can be completely embedded inside the magnetic core 3.

[0044] The second winding 2 includes a zigzag main body 20 in the middle and a third pin 21 and a fourth pin 22 extending in opposite directions on the upper and lower sides (upper and lower positions relative to the illustrated direction). For example, in the illustrated direction, the third pin 21 is located at the top and extends to the left side or the first end face 31 of the magnetic core 3; the fourth pin 22 is located at the bottom and extends to the right side or the second end face 32 of the magnetic core 3. The third pin 21 and the fourth pin 22 can be arranged in a straight line and are parallel to each other up and down (not limited to parallel). The entire first winding 2 is formed by bending a single piece of conductor (such as a copper conductor). The bending degree of the zigzag main body 20 in the middle can be adjusted to adjust the length of the zigzag main body, and the zigzag main body 20 can be formed by connecting two opposite arcs (including arcs or curves similar to arcs) up and down.

[0045] By way of non-limiting example, the body 20 of the second winding 2 is coplanar with its two pins 21 and 22. Therefore, the second winding 2 as a whole has a planar or flat-plate structure. The cross-section of the conductor for winding the second winding is the same. The conductor is bent along its length to form the body 20 of the second winding 2 and the pins 21 and 22, and the various thicknesses of the winding are the same. The outer surface of the third pin 21 is exposed to the fourth end face 34 of the magnetic core 3 and is flush with the fourth end face 34. The end face of the third pin 21 is located on the first end face 31 and is flush with the first end face 31, serving as the input end of the second winding 2 and being electrically connected to the circuit on the circuit board. The outer surface of the fourth pin 22 is exposed to the third end face 33 of the magnetic core 3 and is flush with the third end face 33. The end face of the fourth pin 22 is located on the second end face 32 and is flush with the second end face 32, serving as the output end of the second winding 2 and being electrically connected to the circuit of the circuit board. It can be understood that only the end faces (as the input end and the output end) of the third pin and the fourth pin can be exposed to the first end face 31 or the second end face 33 of the magnetic core, and other parts of the pins can be completely embedded inside the magnetic core 3.

[0046] For the dual-coupled and anti-coupled inductor 100 of this embodiment, its two windings have coplanar inputs and coplanar outputs. The input ends are both on the left side or both located on the first end face 31 of the magnetic core, and the output ends are both on the right side or both located on the second end face 32 of the magnetic core, so as to facilitate soldering to the circuit on the circuit board. It can be understood that the circuit board can be a PCB board. Specifically, the terminals of one pin 11 and 21 of each of the two windings serve as the input ends of the current and are located on the first end face 31 of the magnetic core 3. The end face of the first pin 11 of the first winding 1 is located at the bottom of the first end face 31 near one (left rear bottom) vertex angle of the magnetic core, and the end face of the third pin 21 of the second winding 2 is located at the top of the first end face 31 of the magnetic core near the other opposite vertex angle (left front top); that is, the first pin 11 and the third pin 21 of the inductor serve as the input ends of the current and are located on the same side and coplanar, respectively located at the diagonals to increase the interval between the two pins. The terminals of the other one pin 12 and 22 of each of the two windings serve as the output ends of the current and are located on the opposite second end face 32 of the magnetic core 3. The end face of the second pin 12 of the first winding 1 is located at the top of the second end face 32 near one vertex angle of the magnetic core, and the end face of the fourth pin 22 of the second winding 2 is located at the bottom of the second end face 32 of the magnetic core near the other opposite vertex angle of the magnetic core; that is, the second pin 21 and the fourth pin 22 of the inductor serve as the output ends of the current and are located on the same side and coplanar, respectively located at the diagonals to increase the interval between the two pins.

[0047] The first winding 1 and the second winding 2 are parallel to each other and are symmetrically arranged inside the magnetic core 3 along the central axis H1 of the magnetic core. The first winding 1 and the second winding 2 form two upper and lower circles (including similar circles) on one of the projection planes. Refer to Figure 4。The upper arc of the first winding body 10 is opposite to the upper arc of the second winding body 20, the current is reversed, and they are symmetric along the central axis H1, and are spliced into an upper circle on the front projection plane. The lower arc of the first winding body 10 is opposite to the lower arc of the second winding body 20, is symmetric along the central axis H1, and is spliced into a lower circle on the front projection plane. Refer to Figure 3 and Figure 4 , under such conditions, the magnetic induction intensity B1 in the two enclosed circular regions is greater than the magnetic induction intensity B2 outside the circular regions, and the magnetic induction intensity B2 outside the circular regions gradually decreases towards the surface of the magnetic core.

[0048] The magnetic core 3 is preferably integrally formed. Specifically, several windings (such as the first winding 1 and the second winding 2 of the dual-coupled winding) are placed in a mold, filled with insulating magnetic core powder, and pressure is applied for molding by pressing. 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 application is obtained. The annealing temperature can be 400~850°C.

[0049] The magnetic core 3 is formed by co-firing and pressing with insulating magnetic core powder (i.e., integrally formed). 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, etc., or amorphous powder.

[0050] The insulating magnetic core powder and the windings are co-fired and pressed into shape in the mold. 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. The insulating magnetic core powder and multiple windings are co-fired and pressed, saving volume and realizing small volume and high power density.

[0051] The cross-sectional shapes of the first winding 1 and the second winding 2 can be, but are not limited to, arcs, rectangles, etc. For example, the cross-sections of the conductors winding the first winding 1 and the second winding 2 are the same, and the conductors are wound around the two windings tortuously, and the overall of each winding is coplanar and in a planar (or flat) shape.

[0052] For the dual-coupled and anti-coupled inductor of the above embodiments, the first winding 1 is the front winding, and the second winding 2 is the rear winding. Preferably, the two windings are insulated by a magnetic core (the magnetic core and the winding are integrally formed or co-fired). Since the windings are axisymmetric about the magnetic core, the generated magnetic field directions are opposite, and its coupling coefficient is extremely low, approaching 0. The anti-coupled inductor of the present application adopts a magnetic integration method, and the size and dimensions of the windings can be arbitrarily adjusted according to actual needs to meet various circuit requirements. The windings are placed in an insulating magnetic core powder and then formed under high pressure. The magnetic core and the windings are in full 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.

[0053] Referring to Figure 7-8 , the anti-coupled inductor of the present application is compared with a positive-coupled inductor of the same size, that is, a magnetic core of the same size and positive and negative coupled windings wound by copper wires of the same size. After magnetic simulation, the magnetic field direction and the coupling coefficient are compared. The comparison results are as follows: Figure 8 Using the same magnetic core size as the anti-coupled inductor of the present application and wound by copper conductors of the same size, simulation is carried out at a relative magnetic permeability of 60. It can be seen from the simulation results that the magnetic field directions inside the positive-coupled inductor are the same, and its coupling coefficient is 0.15984; Figure 7 As shown inside the anti-coupled inductor of the present application, the magnetic field directions generated by the two windings are opposite, so the purpose of anti-coupling can be achieved; therefore, its coupling coefficient is negative, specifically -0.087407, and its coupling coefficient is extremely low, approaching 0. For the anti-coupled inductor of the present application, an anti-coupling is formed between the first winding 1 and the second winding 2, and the coupling coefficient is negative, and its value is as low as 10 -2 order of magnitude, and its coupling coefficient is extremely low, approaching 0. Refer to Table 1 below:

[0054] Table 1 Coupling coefficients of positive-coupled windings and anti-coupled windings

[0055]

[0056] The magnetically integrated anti-coupled inductor of the present application is mainly used for dual-path coupling and can also be applied to multi-path coupling. In other embodiments, referring to Figure 6 , inside the magnetic 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. By analogy, multi-path coupling can be obtained. The structure, coupling, current direction, etc. of every two adjacent first windings 1 and second windings 2 are the same as those of the above dual-coupled embodiments, and an anti-coupling is formed between each pair of dual-coupled windings. Thus, a multi-path coupled inductor is obtained.

[0057] Referring to Figure 9, the difference between the second embodiment of the present application and the above-mentioned first embodiment lies in that the shapes of the first winding 1 and the second winding 2 are slightly different, approximately in the shape of a positive and negative S or a positive and negative Z, including two horizontal n-shaped connections in different directions up and down. After magnetic simulation, the magnetic field direction and the coupling coefficient are measured. The magnetic field directions generated by the two windings are opposite, so the purpose of anti-coupling can be achieved; therefore, its coupling coefficient is negative, specifically -0.018807, and its coupling coefficient is extremely low, approaching 0. For the anti-coupling inductor of the present application, anti-coupling is formed between the first winding 1 and the second winding 2, the coupling coefficient is negative, and its value is as low as 10 -2 orders of magnitude, and its coupling coefficient is extremely low, approaching 0. Refer to Table 2 below:

[0058] Table 2 Coupling Coefficient of Anti-Coupling Windings

[0059]

[0060] The anti-coupling inductor 100 of the present application has the following characteristics:

[0061] 1) It can reduce the loss caused by mutual inductance;

[0062] 2) It has an anti-coupling effect, its coupling coefficient is extremely low, negative, and its value is as low as 10 -2 orders of magnitude, approaching 0;

[0063] 3) It improves the dynamic response characteristics of the circuit;

[0064] 4) It reduces the inductor current ripple;

[0065] 5) For the integrally formed (co-fired and molded magnetic core-winding) anti-coupling inductor, it has a high-density characteristic. The magnetic core and the winding are tightly combined, so it has good heat conduction and heat dissipation effects, keeping the inductor at a low operating temperature; the soft magnetic powder material is evenly distributed between each layer of the coil, forming a suitable spacing between the windings and achieving an insulating effect;

[0066] 6) The process is simple, easy to implement automatically, and the cost is low;

[0067] 7) In the double-coupling windings, the two windings are input coplanarly and output coplanarly, and the currents on the windings achieve the effect of opposite directions;

[0068] 8) It can achieve multi-channel integral molding, save volume, and achieve small volume and high power density.

[0069] The present application further provides a power supply, which includes a circuit board and the anti-coupling inductor 100 of the above embodiment. The first pin 11 and the second pin 12 of the first winding 1 of the double-coupling windings in the anti-coupling inductor 100, and the third pin 21 and the fourth pin 22 of the second winding 2 are exposed on the surface of the magnetic core to form pads, and are welded and electrically connected to the corresponding pads of the circuit on the circuit board. 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 a load. 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 (multi-phase VR 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.

[0070] Referring to Figure 10-11 , the third embodiment provides a TLVR inductor 100, in which two adjacent first windings 1 and 1' and two adjacent second windings 2 and 2' are arranged at intervals in the magnetic core 3. The two adjacent first windings 1 and 1' and the two adjacent second windings 2 and 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 S-shaped conductor, and the second winding pair 2 is an anti-S-shaped conductor, corresponding to four pins 11, 12, 21, and 22, which are respectively exposed on the left and right opposite end faces 31 and 32 of the magnetic core 3, that is, the pins 11 and 21 for input current are exposed on the end face 31, and the pins 12 and 22 for output current are exposed on the opposite end face 32, corresponding to the solder feet of the VR circuit; while in this embodiment, the two adjacent first windings 1 and 1' are two S-shaped conductors, and the two adjacent second windings 2 and 2' are two anti-S-shaped conductors, corresponding to 8 pins 11 / 11', 12 / 12', 21 / 21', and 22 / 22', which are respectively exposed on the left and right opposite end faces 31 and 32 of the magnetic core 3, that is, the pins 11 / 11' and 21 / 21' for input current are exposed on the end face 31, and the pins 12 / 12' and 22 / 22' for output current are exposed on the opposite end face 32, corresponding to the solder feet of the TLVR circuit. A high coupling is formed between the two adjacent first windings 1 and 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 and 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 and 1' and the two adjacent second windings 2 and 2', the internal current directions are opposite, and the current is input and output coplanarly.

[0071] The 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 the magnetic core 3 (i.e., the magnetic core powder is filled between the two adjacent first windings 1 and 1'). Each includes two zigzag segments with different directions, for example, formed by connecting n-shapes with opposite up and down directions. The 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 the magnetic core 3 (i.e., the magnetic core powder is filled between the two adjacent second windings 2 and 2'). Each includes two zigzag segments with different directions, for example, formed by connecting n-shapes with opposite up and down directions. The conductors between the windings 1 / 1' and 2 / 2' are also insulated by the magnetic core 3.

[0072] It can be understood that between the two adjacent first windings 1 and 1' or between the two adjacent second windings 2 and 2', mutual insulation and 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 inside the magnetic core 3.

[0073] For the windings inside the anti-coupling inductor of the third embodiment, the two adjacent first windings 1 and 1' are stacked parallel and close to each other up and down, and are nested with one being larger and the other being smaller; the two adjacent second windings 2 and 2' are stacked close to each other up and down, and are nested with one being larger and the other being smaller. It can be understood that the two adjacent first windings 1 and 1' can also be parallel and close to each other front and back, and their sizes can be the same or different; the two adjacent second windings 2 and 2' can also be parallel and close to each other front and back, and their 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, and the auxiliary windings 1' and 2' are connected in series inside the circuit board or the magnetic core 3. The pins of the windings 1 and 2 correspond to the solder feet of the TLVR circuit. For example, the pins 11 and 21 are respectively connected to the switching unit at the output end, the pins 12 and 22 are electrically connected and used as a common output end to be connected to the load, the pin 11' is connected to the compensation inductor Lc, and the pin 12' is electrically connected to the pin 21'.

[0074] 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. A reverse coupling inductor, comprising a magnetic core and a plurality of windings buried therein, 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 include two zigzag sections with different directions; when the first winding and the second winding are connected to current, the input and the output are on the same side, and the magnetic fields generated by the current inside the magnetic core are in opposite directions, thereby achieving magnetic field anti-coupling.

2. The anti-coupled inductor according to claim 1, characterized in that: The first winding and the second winding are arranged in the magnetic core, and the pins of the windings are exposed to the end surface of the magnetic core to be electrically connected to the circuit board. The currents input into the first winding and the second winding are coplanar input and coplanar output, and the internal currents are in opposite directions.

3. The anti-coupled inductor according to claim 1, characterized in that: The coupling coefficient between the first winding and the second winding of the anti-coupling inductor is as low as 10 -2 Order of magnitude.

4. The anti-coupled inductor according to claim 1, wherein: The first winding and the second winding are symmetrical with respect to the center of the magnetic core; The anti-coupling inductor is a multi-way coupling integration, and the multi-way coupling integration is arranged in a manner of spacing between the first winding and the second winding, or spacing between two adjacent first windings and two adjacent second windings.

5. The anti-coupled inductor according to claim 1, wherein: The surfaces of the first winding and the second winding are covered with an insulating material to achieve mutual insulation; and / or, The first winding and the second winding are insulated by a magnetic core, and insulating magnetic core powder is filled between and around the windings, and then pressed together to form an integrally formed magnetic integrated structure.

6. The anti-coupled inductor according to claim 1, wherein: The first winding is S-shaped or Z-shaped, including two zigzag sections in opposite directions, with two ends forming a first pin and a second pin; the first pin is exposed to the first end surface of the magnetic core to form a current input end to be electrically connected to the circuit board, and the second pin is exposed to the second end surface of the magnetic core to form a current output end to be electrically connected to the circuit board; the first end surface and the second end surface are opposite to each other; The second winding is in an inverted S shape or an inverted Z shape; it includes two meandering sections in opposite directions, with two ends forming a third pin and a fourth pin; the third pin is exposed to the first end surface of the magnetic core to form a current input end to be electrically connected to the circuit board, and the fourth pin is exposed to the second end surface of the magnetic core to form a current output end to be electrically connected to the circuit board.

7. The anti-coupled inductor according to claim 6, characterized in that: The first winding and the second winding are combined into two upper and lower circles on a projection plane; The upper arc of the first winding is opposite to the upper arc of the second winding, and they are combined into an upper circle on a projection plane; The lower arc of the first winding is opposite to the lower arc of the second winding, and they are combined into a lower circle on a projection plane.

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 first windings 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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