Magnetic integrated inductor and switching converter

Abstract

The utility model relates to a magnetic integrated inductor and a switching converter, and belongs to the technical field of electronic components, the magnetic integrated inductor comprises a plurality of yoke iron magnetic cores which are sequentially and oppositely arranged at intervals, a coil assembly group is correspondingly arranged between any two adjacent yoke iron magnetic cores to correspondingly form one path of inductor, and therefore multiple paths of inductors are obtained; each coil assembly group comprises at least one coil assembly, and each coil assembly comprises a center pillar magnetic core and a coil wound on the surface of the center pillar magnetic core; the ratio of the magnetic conductivity of the yoke ferromagnetic core not on the outermost side to the magnetic conductivity of the center pillar magnetic core is larger than or equal to a first preset value so that no coupling effect can be achieved among the multiple inductors, or the ratio of the magnetic conductivity of the yoke ferromagnetic core not on the outermost side to the magnetic conductivity of the center pillar magnetic core is between a second preset value and a third preset value so that the coupling effect can be achieved among the multiple inductors, and the second preset value and the third preset value are both smaller than the first preset value. The second preset value is smaller than 1, and the third preset value is larger than 1, so that the size and the cost of the magnetic integrated inductor can be reduced, current ripples can be reduced, and the efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronic components, in particular to a magnetic integrated inductor and a switching converter. BACKGROUND

[0002] In the field of power electronics, inductance is a very important power component. Switching converters generally need power inductance to cooperate with switching tubes for high-frequency switching filtering and energy storage to achieve power conversion. High-power power converters generally use multiple parallel connections to achieve high current and high power, and each parallel path requires a power inductor with large current-carrying capacity and large inductance. Using a separate inductor for each path has a large volume and high loss, and if an integrated inductor is used, the volume and loss of the inductor can be reduced by sharing a magnetic circuit, and the efficiency of the converter can be improved. Magnetic integrated inductors are widely used in MPPT (Maximum power point tracking) circuits in photovoltaic inverters, LC (Inductance and capacitance) filter networks for three-phase alternating current inverters, boost circuits in high-power UPS (Uninterruptible power supply) or rectifier power supply modules, and bidirectional Buck (step-down) / Boost (step-up) converters.

[0003] However, existing magnetic integrated inductors have the problems of large volume and high cost. CONTENT OF THE INVENTION

[0004] The purpose of the present application is to provide a magnetic integrated inductor to solve the problems of large volume and high cost of existing magnetic integrated inductors.

[0005] The magnetic integrated inductor provided by the embodiments of the present application comprises a plurality of yoke magnetic cores and a plurality of coil assembly groups, wherein the plurality of yoke magnetic cores are arranged in sequence with a relative interval, and one coil assembly group is arranged between any two adjacent yoke magnetic cores to correspondingly form one inductor, thereby obtaining multiple inductors; each coil assembly group comprises at least one coil assembly, and each coil assembly comprises a middle column magnetic core and a coil wound on the surface of the middle column magnetic core; and the ratio of the magnetic permeability of the non-outermost yoke magnetic core to the magnetic permeability of the middle column magnetic core is greater than or equal to a first preset value to realize no coupling effect between the multiple inductors, or is between a second preset value and a third preset value to realize a coupling effect between the multiple inductors, wherein the second preset value and the third preset value are both less than the first preset value, the second preset value is less than 1, and the third preset value is greater than 1.

[0006] The first preset value is greater than or equal to 100.

[0007] wherein the second preset value is greater than or equal to 0.1, and the third preset value is less than or equal to 10.

[0008] wherein the permeability of the plurality of yoke magnetic cores is equal, and the permeability of the center column magnetic core is equal to the permeability of the yoke magnetic core.

[0009] wherein the permeability of the outermost yoke magnetic core is equal to the permeability of the center column magnetic core.

[0010] wherein the plurality of yoke magnetic cores comprises a first yoke magnetic core, a second yoke magnetic core, a third yoke magnetic core and a fourth yoke magnetic core arranged in sequence with a relative interval; the plurality of coil assembly groups comprises a first coil assembly group, a second coil assembly group and a third coil assembly group, wherein the first coil assembly group is arranged between the first yoke magnetic core and the second yoke magnetic core, the second coil assembly group is arranged between the second yoke magnetic core and the third yoke magnetic core, and the third coil assembly group is arranged between the third yoke magnetic core and the fourth yoke magnetic core, and each of the first coil assembly group, the second coil assembly group and the third coil assembly group comprises two coil assemblies.

[0011] wherein the center column magnetic core is fixedly connected with the corresponding adjacent two yoke magnetic cores at opposite ends along the length direction of the center column magnetic core.

[0012] wherein the yoke magnetic core is in a flat plate structure, and the flat plate structure is in a shape of a rectangle, a rhombus, a circle, an ellipse, a hexagon or an octagon.

[0013] wherein the center column magnetic core is in an elliptical column shape, a cylindrical shape or a multi-prism shape.

[0014] The embodiments of the present application also provide a switching converter, which comprises the magnetic integrated inductor of any one of the above.

[0015] The application has the advantages that the magnetic integrated inductor and the switching converter provided by the application are applied to the switching converter, and the magnetic integrated inductor comprises a plurality of yoke magnetic cores and a plurality of coil assembly groups, wherein the plurality of yoke magnetic cores are sequentially and oppositely spaced, and one coil assembly group is arranged between any two adjacent yoke magnetic cores to correspondingly form one inductor, thereby obtaining multiple inductors; each coil assembly group comprises at least one coil assembly, and each coil assembly comprises a middle column magnetic core and a coil wound on the surface of the middle column magnetic core; and the ratio of the magnetic permeability of the non-outermost yoke magnetic core to the magnetic permeability of the middle column magnetic core is greater than or equal to a first preset value to realize no coupling effect between the multiple inductors, or is between a second preset value and a third preset value to realize a coupling effect between the multiple inductors, wherein the second preset value and the third preset value are both less than the first preset value, the second preset value is less than 1, and the third preset value is greater than 1, thereby realizing integrated multiple inductors, and the non-outermost yoke magnetic core is shared by two inductors, so that the volume and material of the yoke magnetic core can be saved, the purpose of reducing the volume and saving the cost is achieved, and the magnetic permeability of the yoke magnetic core and the middle column magnetic core can be reasonably set according to actual needs to realize no coupling effect or a coupling effect between the multiple inductors integrated by the magnetic integrated inductor, and in the case of a coupling effect between the multiple inductors integrated by the magnetic integrated inductor, the inductance can be increased, the inductance current ripple rate can be reduced, the inductance loss can be reduced, and the efficiency can be improved through the mutual influence of the magnetic flux. BRIEF DESCRIPTION OF DRAWINGS

[0016] The technical solutions and other advantages of the application will be apparent from the following detailed description of the application, combined with the accompanying drawings.

[0017] Figure 1 is a structural schematic diagram of a magnetic integrated inductor provided by the prior art;

[0018] Figure 2 is another structural schematic diagram of a magnetic integrated inductor provided by the prior art;

[0019] Figure 3 is a three-dimensional structural schematic diagram of a magnetic integrated inductor provided by an embodiment of the application;

[0020] Figure 4 is an equivalent circuit diagram of a non-coupling integrated inductor provided by an embodiment of the application;

[0021] Figure 5 is a working mode diagram of two adjacent periods in a BUCK mode provided by an embodiment of the application;

[0022] Figure 6 is a structural schematic diagram of a switching converter provided by an embodiment of the application. DETAILED DESCRIPTION

[0023] In order to make the purposes, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. The examples of the embodiments are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary only and are merely used to explain the present application, and should not be understood as limiting the present application. In addition, it should be understood that the specific embodiments described herein are merely used to explain the present application and should not be used to limit the present application.

[0024] When describing the structure of a component, when one layer, one region is referred to as being "on" or "above" another layer, another region, it can mean being directly above the other layer, another region, or other layers or regions can be included therebetween. And if the component is flipped, the one layer, one region will be "under" or "below" the other layer, another region. In addition, the features, structures or characteristics described below can be combined in any suitable manner in one or more embodiments.

[0025] In addition, the directional phrases mentioned in the embodiments of the present application, such as [up], [down], [front], [back], [left], [right], [inward], [outward], [side] and the like, are only the directions of the reference drawings. Therefore, the directional phrases used are used to illustrate and understand the embodiments of the present application, and are not used to limit the embodiments of the present application. In each drawing, similar structures are represented by the same reference numerals. For the sake of clarity, each part in the drawings is not drawn to scale. In addition, some related parts can not be shown in the drawings.

[0026] In the field of power electronics, inductance is a very important power component. Switching converters generally require power inductors to cooperate with switching tubes for high-frequency switching filtering and energy storage to achieve power conversion. High-power power converters generally use multiple parallel connections to achieve high current and high power, and each parallel connection requires a power inductor with large current-carrying capacity and large inductance. Using separate inductors for each path results in large size and high loss. If integrated inductors are used, the volume and loss of the inductors can be reduced by sharing the magnetic circuit, and the efficiency of the converter can be improved. Magnetic integrated inductors are widely used in MPPT (Maximum Power Point Tracking) circuits in photovoltaic inverters, LC (Inductance and Capacitance) filter networks for three-phase AC inverter output, boost circuits in high-power UPS (Uninterruptible Power Supply) or rectifier power supply modules, and bidirectional Buck / Boost converters.

[0027] The design scheme of the magnetic integrated inductor in the prior art includes the following two kinds.

[0028] The first kind is an integrated scheme in which two or more coil windings are wound on a magnetic ring structure.

[0029] Specifically, as shown in Figure 1 Patent CN118098786A proposes a design method for a miniaturized integrated inductor, which includes a main magnetic core and multiple coil windings wound on the main magnetic core, and the multiple coil windings are used to provide common-mode inductance. The integrated inductor also includes a magnetic strip that passes through the hollow part of the coil winding, and the magnetic strip is used to provide differential-mode inductance. In this way, the integrated inductor has both large common-mode inductance and small differential-mode inductance, greatly improves manufacturability, reduces circuit area, and reduces cost. In addition, by adjusting the magnetic strip, the magnetic field shape, magnetic field parameters, and the like of the integrated inductor can be changed, which can reduce the debugging cost and increase the debugging efficiency. However, this scheme requires multiple coils to be wound on a magnetic core, which requires a high maximum magnetic flux density of the magnetic core to prevent saturation of the magnetic core.

[0030] The second kind is an integrated scheme in which coil windings are placed in the middle and surrounded by magnetic columns around the periphery.

[0031] Specifically, as shown in Figure 2 Patent CN118538511A proposes a three-phase magnetic integrated inductor scheme, which uses an all-metal magnetic powder core scheme to control the coupling coefficient between adjacent coils to be small, reducing the amount of iron core and helping to reduce cost and improve efficiency. This scheme places the coil windings and the middle column magnetic core in the middle, and needs to surround the magnetic blocks around the periphery, which cannot minimize the volume and reduce the cost to the greatest extent.

[0032] However, the first scheme can reduce the volume of the inductor by winding multiple coils on a magnetic core, but the maximum magnetic flux density of the magnetic core needs to be high to prevent the magnetic core from being saturated, otherwise there is a risk of magnetic core saturation. The second scheme places the coil winding and the center column magnetic core in the middle, and still needs to surround the magnetic block around, which cannot maximize the volume reduction and cost reduction.

[0033] To solve the above problems, the embodiment of the present application provides a magnetic integrated inductor and a switching converter. The magnetic integrated inductor is applied to the switching converter and includes a plurality of yoke magnetic cores and a plurality of coil assembly groups. The plurality of yoke magnetic cores are arranged in sequence with a relative interval, and each adjacent two yoke magnetic cores correspond to a coil assembly group to form a path of inductance, thereby obtaining multiple paths of inductance. Each coil assembly group includes at least one coil assembly, and each coil assembly includes a center column magnetic core and a coil wound on the surface of the center column magnetic core. The ratio of the magnetic permeability of the non-outermost yoke magnetic core to the magnetic permeability of the center column magnetic core is greater than or equal to a first preset value to realize no coupling effect between the multiple paths of inductance, or is between a second preset value and a third preset value to realize a coupling effect between the multiple paths of inductance. The second preset value and the third preset value are both less than the first preset value, the second preset value is less than 1, and the third preset value is greater than 1. Thus, the integrated multiple paths of inductance are realized, and the non-outermost yoke magnetic core is shared by two paths of inductance, thereby saving the volume and material of the yoke magnetic core, achieving the purpose of reducing the volume and saving the cost. The magnetic permeability of the yoke magnetic core and the center column magnetic core can be reasonably set according to actual needs to realize no coupling effect or coupling effect between the multiple paths of inductance integrated by the magnetic integrated inductor. In the case of coupling effect between the multiple paths of inductance integrated by the magnetic integrated inductor, the mutual influence of the magnetic flux can increase the inductance, reduce the inductance current ripple, and reduce the inductance loss, which is beneficial to improve the efficiency of the switching converter.

[0034] The following will be described in detail in combination with specific embodiments. It should be noted that the sequence numbers of the following embodiments do not limit the preferred order of the embodiments.

[0035] Please refer to Figure 3 , Figure 3 is a perspective structural schematic diagram of the magnetic integrated inductor provided by the embodiment of the present application. As shown in Figure 3As shown, the magnetic integrated inductor 1 comprises a plurality of yoke magnetic cores 10 and a plurality of coil assembly groups 20, wherein the plurality of yoke magnetic cores 10 are sequentially and oppositely spaced, and any adjacent two yoke magnetic cores 10 can correspondingly be provided with one coil assembly group 20 to correspondingly constitute one inductance L, so as to obtain multiple inductances L, realize the integration of the magnetic integrated inductor 1 with multiple inductances L, and make the non-outermost yoke magnetic cores 10 be shared by two inductances L, thereby being capable of saving the volume and material of the yoke magnetic cores 10, achieving the purposes of reducing the volume of the magnetic integrated inductor 1 and saving the cost of the magnetic integrated inductor 1.

[0036] Specifically, each coil assembly group 20 can comprise at least one coil assembly 21, each coil assembly 21 can comprise a column magnetic core 211 and a coil 212 wound on the surface of the column magnetic core 211, and each yoke magnetic core 10 can form a magnetic circuit with the coil assembly group 20 adjacent thereto. For example, as shown, Figure 3 As shown, each coil assembly group 20 can comprise two coil assemblies 21, the column magnetic cores 211 of the two coil assemblies 21 can be parallel to each other, and the coils 212 wound on the surfaces of the column magnetic cores 211 of the two coil assemblies 21 can be round enameled copper wires or flat wires (such as vertical porcelain wires or aluminum wires, etc.).

[0037] In addition, the ratio of the magnetic permeability of the non-outermost yoke magnetic cores 10 to the magnetic permeability of the column magnetic core 211 in the plurality of yoke magnetic cores 10 except the outermost yoke magnetic cores 10 can be greater than or equal to a first preset value, so as to realize the uncoupling effect between the multiple inductances L; or the ratio of the magnetic permeability of the non-outermost yoke magnetic cores 10 to the magnetic permeability of the column magnetic core 211 in the plurality of yoke magnetic cores 10 except the outermost yoke magnetic cores 10 can be between a second preset value and a third preset value, so as to realize the coupling effect between the multiple inductances L. The second preset value and the third preset value are both less than the first preset value, the second preset value is less than 1, and the third preset value is greater than 1.

[0038] In the magnetic integrated inductor 1, each inductance L is constituted by two adjacent yoke magnetic cores 10 and one coil assembly group 20 located between the two adjacent yoke magnetic cores 10. In addition, the multiple inductances L integrated by the magnetic integrated inductor 1 are connected in parallel, so that the magnetic integrated inductor 1 can be applied to a multiple parallel switching converter as a multiple parallel integrated inductor, and under the condition of meeting the power requirement of the converter, the volume of the inductor can be reduced, the cost can be reduced, and the volume of the converter can be reduced, the cost can be reduced, and the efficiency can be improved.

[0039] Furthermore, it should be noted that in this embodiment, the absence of coupling effect between the aforementioned multiple inductors L can mean that the coupling coefficient between the aforementioned multiple inductors L is very small and can be ignored, for example, close to or equal to zero, so that the aforementioned magnetic integrated inductor 1 can be regarded as an uncoupled integrated inductor.

[0040] The coupling effect between the above-mentioned multiple inductors L can be interpreted as follows: the coupling coefficient between the above-mentioned multiple inductors L is relatively large and cannot be ignored, so the above-mentioned magnetic integrated inductor 1 can be regarded as a coupled integrated inductor.

[0041] For ease of understanding, the following will use... Figure 3 The magnetic integrated inductor 1 shown is an example of a three-way parallel integrated inductor, which will be explained in detail below. Figure 3 As shown, the magnetically integrated inductor 1 may include four yoke ferromagnetic cores 10 (i.e., a first yoke ferromagnetic core 10A, a second yoke ferromagnetic core 10B, a third yoke ferromagnetic core 10C, and a fourth yoke ferromagnetic core 10D) arranged sequentially and relatively spaced apart, and three coil assembly groups 20 (i.e., a first coil assembly group 20A, a second coil assembly group 20B, and a third coil assembly group 20C). The first coil assembly group 20A may be disposed between the first yoke ferromagnetic core 10A and the second yoke ferromagnetic core 10B to form a first inductance L1 composed of the first coil assembly group 20A, the first yoke ferromagnetic core 10A, and the second yoke ferromagnetic core 10B. The second coil assembly group 20B may be disposed between the second yoke ferromagnetic core 10B and the third yoke ferromagnetic core 10C to form a second inductance L2 composed of the second coil assembly group 20B, the second yoke ferromagnetic core 10B, and the third yoke ferromagnetic core 10C. The third coil assembly group 20C can be disposed between the third yoke ferromagnetic core 10C and the fourth yoke ferromagnetic core 10D to obtain a third inductor L3 composed of the third coil assembly group 20C, the third yoke ferromagnetic core 10C, and the fourth yoke ferromagnetic core 10D. Furthermore, each of the first coil assembly group 20A, the second coil assembly group 20B, and the third coil assembly group 20C can include two coil assemblies 21.

[0042] Furthermore, the inventors of this application discovered during long-term research and development that: when the outermost yoke ferromagnetic core 10 (for example, Figure 3 When the permeability of the second yoke ferromagnetic core 10B and the third yoke ferromagnetic core 10C shown is much greater than the permeability of the central core 211, the multi-channel inductor L integrated in the magnetic integrated inductor 1 (e.g., Figure 3 The coupling coefficients between the first inductor L1, the second inductor L2, and the third inductor L3 shown in the figure are close to or equal to zero, so the magnetic integrated inductor 1 can be regarded as an uncoupled integrated inductor.

[0043] In implementation, in order to make the coupling coefficient between the multiple inductors L integrated by the magnetic integrated inductor 1 close to or equal to zero, the first preset value can be greater than or equal to 100, that is, the ratio of the permeability of the non-outermost yoke magnetic core 10 in the multiple yoke magnetic cores 10 to the permeability of the middle column magnetic core 211 can be greater than or equal to 100, so that the permeability of the non-outermost yoke magnetic core 10 in the multiple yoke magnetic cores 10 is much greater than the permeability of the middle column magnetic core 211.

[0044] Specifically, for the convenience of understanding, the following will take the magnetic integrated inductor 1 shown in FIG. 1 as an example for specific description, which is a three-parallel integrated inductor. Figure 3 Figure 3 As shown in FIG. 1, it is assumed that the permeability of the middle column magnetic core 211 is 26, the permeability of the outermost yoke magnetic core 10 (i.e., the first yoke magnetic core 10A and the fourth yoke magnetic core 10D) in the multiple yoke magnetic cores 10 is equal to the permeability of the middle column magnetic core 211, that is, also 26, and the permeability of the non-outermost yoke magnetic core 10 (i.e., the second yoke magnetic core 10B and the third yoke magnetic core 10C) in the multiple yoke magnetic cores 10 is 3000, then the current and the resistance can be used to analog the magnetic flux line and the magnetic resistance respectively, and according to the set permeability, the circuit model shown in FIG. 2 can be analogized, wherein, Figure 4 Figure 4 The numbers around each resistance in FIG. 2 respectively correspond to the resistance value of each resistance.

[0045] Correspondingly, Figure 4 The ratio of the sum of the current I2 and the current I3 to the current I1 in FIG. 2 can be equivalent to the coupling coefficient between the two adjacent inductors L (for example, the third inductor L3 and the second inductor L2) in FIG. 1, and can be calculated by the following formula (1): Figure 3

[0046]

[0047] The ratio of the sum of the current I2 and the current I3 to the current I1 in FIG. 2, that is, Figure 4 The coupling coefficient between the two adjacent inductors L in FIG. 1. Figure 3

[0048] From the calculation result of the above formula (1), it can be known that the coupling coefficient between the two adjacent inductors L in FIG. 1 is about 0.00431, which is very small and close to zero, which shows that although Figure 3 Figure 3 ​​​​​The yoke magnetic core 10 is shared by the two adjacent inductors L, but the magnetic permeability of the yoke magnetic core 10 and the center column magnetic core can be reasonably selected to realize that the magnetic integrated inductor 1 can be regarded as an uncoupled integrated inductor.

[0049] Further, in the case that the magnetic integrated inductor 1 in the magnetic integrated inductor 1 can be regarded as an uncoupled integrated inductor, Figure 3 in the case that the magnetic integrated inductor 1 in the magnetic integrated inductor 1 can be regarded as an uncoupled integrated inductor, Figure 3 The relationship between the current and the voltage across the two ends of each inductor L (i.e., the first inductor L1, the second inductor L2, or the third inductor L3) in the magnetic integrated inductor 1 can be represented by the following formula (2):

[0050]

[0051] wherein V1, V2, and V3 represent the voltages across the three inductors L, respectively; i1, i2, and i3 represent the currents flowing through the coils 212 of the three inductors L, respectively; and L1, L2, and L3 represent the self-inductances of the three inductors L, respectively.

[0052] From the calculation results of the above formula (2), it can be seen that Figure 3 The positive or negative of the current change slope of each inductor L in the magnetic integrated inductor 1 is determined only by the voltage across the two ends of each inductor L.

[0053] Furthermore, the inventors of the present application have also found in long-term research and development that when the magnetic permeability of the non-outermost yoke magnetic core 10 (such as the second yoke magnetic core 10B and the third yoke magnetic core 10C shown in the magnetic integrated inductor 1) is close to or equal to the magnetic permeability of the center column magnetic core 211, the coupling coefficient between the multiple inductors L (such as the first inductor L1, the second inductor L2, and the third inductor L3 shown in the magnetic integrated inductor 1) integrated by the magnetic integrated inductor 1 is relatively large and cannot be ignored, and thus the magnetic integrated inductor 1 can be regarded as a coupled integrated inductor. Figure 3 Figure 3

[0054] Specifically, in order to realize that the coupling coefficient between the multiple inductors L integrated by the magnetic integrated inductor 1 cannot be ignored, the second preset value can be greater than or equal to 0.1, and the third preset value can be less than or equal to 10, that is, the ratio of the magnetic permeability of the non-outermost yoke magnetic core 10 to the magnetic permeability of the center column magnetic core 211 in the multiple yoke magnetic cores 10 except the outermost yoke magnetic core 10 can be between 0.1 and 10, such as 0.1, 0.5, 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10, so that the magnetic permeability of the non-outermost yoke magnetic core 10 in the multiple yoke magnetic cores 10 except the outermost yoke magnetic core 10 is close to or equal to the magnetic permeability of the center column magnetic core 211.

[0055] ​​Specifically, in the case of coupling effect between the multiple inductors L integrated by the magnetic integrated inductor 1, the simple equation V=LdI / dt is no longer applicable to each inductor L in the magnetic integrated inductor 1, that is, the slope given by the coupling equation no longer matches the self-inductance of each inductor L assumed, because of the mutual influence between the windings (i.e., the coils 212) of each inductor L.

[0056] Therefore, when analyzing the coupling between the multiple inductors L integrated by the magnetic integrated inductor 1, not only the coupling coefficient needs to be considered, but also the duty cycle of the driving signal PWM (Pulse width modulation) needs to be considered.

[0057] For the convenience of understanding, the magnetic integrated inductor 1 shown in Figure 3 is applied to a converter as an example for specific description, assuming that the converter works in BUCK (buck) mode and the PWM duty cycle D is less than 1 / 3, there are six working modes I / II / III / IV / V / VI (as shown in Figure 5 ) in a period. And, Figure 3 The relationship between the current of each inductor L in the magnetic integrated inductor 1 shown in

[0058]

[0059] wherein V1, V2, V3 represent the voltages applied across the three inductors L respectively; i1, i2, i3 represent the currents flowing through the coils 212 of the three inductors L respectively; L1, L2, L3 represent the self-inductances of the three inductors L respectively. ij is the self-inductance between each inductor L, wherein i is equal to 1, 2 or 3, and j is equal to 1, 2 or 3. And, let Vin and Vo be the high-voltage side voltage and the low-voltage side voltage of the converter respectively, and let Figure 5 Va=Vin-Vo, Vb=-Vo, and the duty cycle D of the PWM=Vo / Vin. In addition, as shown in Figure 5 , the current waveform W of each inductor L is only the general trend of the currents Ia / Ib / Ic of each inductor L, and does not represent the actual current of each inductor L.

[0060] And, it can be understood that, in the present embodiment, for the above-mentioned magnetic integrated inductor 1, only need to ensure that the magnetic permeability of the non-outermost yoke core 10 is much greater than the magnetic permeability of the center column core, that is, the coupling effect between the multiple inductances integrated by the above-mentioned magnetic integrated inductor 1 can be achieved, and the purpose of reducing the volume and cost of the above-mentioned magnetic integrated inductor 1 can be achieved. And, for the above-mentioned magnetic integrated inductor 1, by making the magnetic permeability of the non-outermost yoke core 10 close to or equal to the magnetic permeability of the center column core, the mutual influence of magnetic flux can be achieved, the inductance can be enhanced, the current ripple can be reduced, and the efficiency can be improved.

[0061] Specifically, in the above-mentioned embodiment in which the coupling effect between the multiple inductances L integrated by the above-mentioned magnetic integrated inductor 1 is eliminated, the magnetic permeability of the outermost yoke core 10 of the above-mentioned multiple yoke cores 10 can be specifically set according to actual needs, and the present case does not limit this. Exemplarily, the magnetic permeability of the outermost yoke core 10 of the above-mentioned multiple yoke cores 10 can be equal to the magnetic permeability of the center column core 211, or can be equal to the magnetic permeability of the non-outermost yoke core 10 of the above-mentioned multiple yoke cores 10 except the outermost yoke core 10.

[0062] Specifically, in the above-mentioned embodiment in which the coupling effect between the multiple inductances L integrated by the above-mentioned magnetic integrated inductor 1 exists, the magnetic permeability of the outermost yoke core 10 of the above-mentioned multiple yoke cores 10 can be equal to the magnetic permeability of the center column core 211, so as to ensure that the coupling effect between the multiple inductances L integrated by the above-mentioned magnetic integrated inductor 1 exists. Exemplarily, the magnetic permeability of the above-mentioned multiple yoke cores 10 can be equal, and the magnetic permeability of the above-mentioned center column core 211 can be equal to the magnetic permeability of the above-mentioned yoke core 10.

[0063] In the above-mentioned embodiment, as shown in Figure 3 , the opposite two ends of the above-mentioned center column core 211 along the length direction thereof can be respectively fixedly connected with the corresponding adjacent two yoke cores 10. Exemplarily, the opposite two ends of the above-mentioned center column core 211 along the length direction thereof can be respectively fixedly connected with the corresponding adjacent two yoke cores 10 by means of bonding (for example, by means of high-temperature glue bonding).

[0064] In the above-mentioned embodiment, as shown in Figure 3 , the above-mentioned yoke core 10 can be a flat plate structure, and the shape of the flat plate structure can be rectangular, rhombic, circular, elliptical, hexagonal or octagonal. Exemplarily, as shown in Figure 3 , the above-mentioned yoke core 10 can specifically be a rectangular flat plate structure.

[0065] In the above-mentioned embodiment, as shown in Figure 3 , the shape of the above-mentioned center column core 211 can be an elliptical column, a cylindrical column or a multi-prism. Exemplarily, as shown inFigure 3 As shown in the drawings, the shape of the pillar magnetic core 211 can be cylindrical.

[0066] In the above embodiment, as shown in the drawings, Figure 3 Each coil assembly 21 in the same coil assembly group 20 can have the same structure, and the magnetic permeability of the pillar magnetic core 211 of each coil assembly 21 in the same coil assembly group 20 can be the same. The coil assemblies 21 in different coil assembly groups 20 can also have the same structure, and the magnetic permeability of the pillar magnetic core 211 of the coil assemblies 21 in different coil assembly groups 20 can also be the same.

[0067] In the above embodiment, as shown in the drawings, Figure 3 The plurality of yoke magnetic cores 10 can have the same structure, and specifically can be arranged in parallel at intervals in sequence. The magnetic permeability of the two outermost yoke magnetic cores among the plurality of yoke magnetic cores 10 can be equal, and the magnetic permeability of all the remaining yoke magnetic cores 10 except the outermost yoke magnetic cores 10 among the plurality of yoke magnetic cores 10 (i.e., the outermost yoke magnetic cores 10) can be equal.

[0068] As can be seen from the above, the magnetic integrated inductor provided by the embodiment includes a plurality of yoke magnetic cores and a plurality of coil assembly groups, wherein the plurality of yoke magnetic cores are arranged at intervals in sequence, and each two adjacent yoke magnetic cores correspond to one coil assembly group to correspondingly form one inductor, thereby obtaining multiple inductors; each coil assembly group includes at least one coil assembly, and each coil assembly includes a pillar magnetic core and a coil wound on the surface of the pillar magnetic core; and the ratio of the magnetic permeability of the non-outermost yoke magnetic core to the magnetic permeability of the pillar magnetic core in the plurality of yoke magnetic cores is greater than or equal to a first preset value to realize no coupling effect between the multiple inductors, or is between a second preset value and a third preset value to realize a coupling effect between the multiple inductors, wherein the second preset value and the third preset value are both less than the first preset value, the second preset value is less than 1, and the third preset value is greater than 1, thereby realizing integrated multiple inductors, and the non-outermost yoke magnetic core is shared by two inductors, so that the volume and material of the yoke magnetic core can be saved, the purpose of reducing the volume and saving the cost is achieved, and the magnetic permeability of the yoke magnetic core and the pillar magnetic core can be reasonably set according to actual needs to realize no coupling effect or a coupling effect between the multiple inductors integrated by the magnetic integrated inductor, and in the case of a coupling effect between the multiple inductors integrated by the magnetic integrated inductor, the mutual influence of the magnetic flux can increase the inductance, reduce the inductance current ripple, reduce the inductance loss, and improve the efficiency.

[0069] The embodiment of the present application also provides a switching converter, which includes the magnetic integrated inductor of any of the above embodiments and can be a multiple parallel switching converter (such as a half-bridge, full-bridge, or Buck / Boost converter, etc.).

[0070] For example, the switching converter can be a multi-channel parallel DC-DC (DC to DC conversion) converter, each of which can have a corresponding power inductor, and the power inductor can be provided by one of the inductors in the aforementioned magnetic integrated inductor.

[0071] For example, such as Figure 6 As shown, this switching converter can specifically be a three-way parallel bidirectional Buck / Boost switching converter. Furthermore, for ease of understanding, the following will use... Figure 3 The magnetic integrated inductor 1 shown is applied to Figure 6 The following is a detailed explanation using a three-way parallel bidirectional Buck / Boost switching converter as an example. Figure 3 and Figure 6 As shown, Figure 6 The three inductors (i.e., inductor L1, inductor L2, and inductor L3) within the dashed rectangular box can be respectively represented by... Figure 3 The three inductors L integrated in the medium magnetic integrated inductor 1 (i.e., the first inductor L1, the second inductor L2, and the third inductor L3) are provided.

[0072] It should be noted that the switching converter provided in this application embodiment, because it is equipped with the magnetic integrated inductor provided in this application embodiment, can achieve the beneficial effects that any magnetic integrated inductor provided in this application embodiment can achieve, as detailed in the previous embodiments, and will not be repeated here.

[0073] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A magnetically integrated inductor, characterized by, The magnetic integrated inductor comprises a plurality of yoke magnetic cores and a plurality of coil assembly groups, wherein the plurality of yoke magnetic cores are arranged in sequence with a relative spacing, and each of any two adjacent yoke magnetic cores is provided with a coil assembly group to correspondingly form a channel inductance, thereby obtaining a plurality of channel inductances. Each coil assembly group comprises at least one coil assembly, and each coil assembly comprises a center column magnetic core and a coil wound on the surface of the center column magnetic core; and the ratio of the magnetic permeability of the non-outermost yoke magnetic core to the magnetic permeability of the center column magnetic core is greater than or equal to a first preset value to realize no coupling effect between the plurality of channel inductances, or is between a second preset value and a third preset value to realize a coupling effect between the plurality of channel inductances, wherein the second preset value and the third preset value are both less than the first preset value, the second preset value is less than 1, and the third preset value is greater than 1.

2. The magnetic integrated inductor of claim 1, wherein, The first preset value is greater than or equal to 100.

3. The magnetic integrated inductor of claim 1, wherein, The second preset value is greater than or equal to 0.1, and the third preset value is less than or equal to 10.

4. The magnetic integrated inductor of claim 1, wherein, The magnetic permeabilities of the plurality of yoke magnetic cores are equal, and the magnetic permeability of the center column magnetic core is equal to the magnetic permeability of the yoke magnetic core.

5. The magnetic integrated inductor of claim 1, wherein, The magnetic permeability of the outermost yoke magnetic core is equal to the magnetic permeability of the center column magnetic core.

6. The magnetic integrated inductor of claim 1, wherein, The plurality of yoke magnetic cores comprise a first yoke magnetic core, a second yoke magnetic core, a third yoke magnetic core and a fourth yoke magnetic core arranged in sequence with a relative spacing, and the plurality of coil assembly groups comprise a first coil assembly group, a second coil assembly group and a third coil assembly group, wherein the first coil assembly group is arranged between the first yoke magnetic core and the second yoke magnetic core, the second coil assembly group is arranged between the second yoke magnetic core and the third yoke magnetic core, the third coil assembly group is arranged between the third yoke magnetic core and the fourth yoke magnetic core, and each of the first coil assembly group, the second coil assembly group and the third coil assembly group comprises two coil assemblies.

7. The magnetic integrated inductor of claim 1, wherein, The center column magnetic core is fixedly connected with its corresponding adjacent two yoke magnetic cores at opposite ends along the length direction thereof.

8. The magnetic integrated inductor of claim 1, wherein, The yoke magnetic core is in a flat plate structure, and the flat plate structure is in a rectangular, rhombic, circular, elliptical, hexagonal or octagonal shape.

9. The magnetic integrated inductor of claim 1, wherein, The center column magnetic core is in an elliptical column shape, a cylindrical shape or a multi-prism shape.

10. A switching converter, characterized by The magnetic integrated inductor comprises the magnetic integrated inductor according to any one of claims 1 to 9.

Images