CN213519515U - Inductance magnetic core, inductor and semiconductor chip - Google Patents
Inductance magnetic core, inductor and semiconductor chip Download PDFInfo
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- CN213519515U CN213519515U CN202021124202.4U CN202021124202U CN213519515U CN 213519515 U CN213519515 U CN 213519515U CN 202021124202 U CN202021124202 U CN 202021124202U CN 213519515 U CN213519515 U CN 213519515U
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Abstract
The embodiment of the application provides an inductance core, an inductor and a semiconductor chip. The top surface of the inductance magnetic core is provided with a spiral groove, and the spiral groove is used for embedding an inductance winding. The embodiment of the present application further provides an inductor, which includes magnetic core and winding, the shape of winding with the heliciform recess phase-match of magnetic core to imbed in the heliciform recess. The inductor provided by the embodiment of the application has the characteristics of small loss, thin thickness, large saturation current and low cost.
Description
Technical Field
The application relates to the technical field of electronic devices, in particular to an inductance magnetic core, an inductor and a semiconductor chip.
Background
Power modules for consumer electronic devices (e.g., computers, tablets, cell phones, etc.) have a tendency to: the power is getting larger and the size (especially the thickness) is getting smaller. The inductors in the power supply module typically occupy a relatively large volume. To comply with the trend, inductors have put higher demands on the performance of large saturation current, low loss, and small size (especially small thickness). The existing inductor is basically a winding inductor or an integrated inductor. Fig. 1 is a schematic diagram of a winding-type inductor in the prior art. As shown in fig. 1, the winding-type inductor includes a magnetic core 11 and a winding 12. The core 11 is usually a ferrite core, and is located at the center of the winding 12, and the sectional area is small, so that the saturation current of the core 11 is small. In addition, in this winding-type inductor, in order to achieve a predetermined inductance, the number of turns of the coil 12 needs to be large, and the thickness of the inductor is large because a plurality of turns of the coil 12 are stacked in the thickness direction of the inductor. Fig. 2 is a schematic diagram of an integrally formed inductor in the prior art. As shown in fig. 2, the integrally molded type inductor includes a core 21 and a winding 22. In the integrally formed inductor, the magnetic core 21 is usually made of a metal magnetic powder core material, and the winding 22 is disposed inside the magnetic core through a molding process. Since the winding 22 is located at the center of the magnetic core 21, the magnetic flux density distribution of the magnetic core 21 is not uniform, and the core loss is large. Therefore, there is a need for a more efficient inductor that meets the needs of the prior art.
SUMMERY OF THE UTILITY MODEL
The embodiments of the present application aim to provide a more efficient inductor to solve the deficiencies in the prior art.
In order to achieve the above object, an aspect of the present application provides an inductor core, wherein the top surface of the core has a spiral groove, and the spiral groove is used for embedding an inductor winding. In the method, the spiral winding can be embedded into the groove of the magnetic core by enabling the magnetic core to be provided with the spiral groove on the top surface of the magnetic core, the groove design of the magnetic core enables the thickness of the inductor to be reduced, and electromagnetic shielding is provided for the inductor so as to reduce electromagnetic interference of the inductor to the outside. In addition, the spiral groove enables the magnetic flux density of the inductor comprising the magnetic core to be uniformly distributed when the inductor is electrified, so that the magnetic loss of the magnetic core is reduced, the energy consumption of the inductor is reduced, and meanwhile, the obtained inductor has larger saturation current and stronger applicability.
In one embodiment, the helical groove is shaped such that an inductor comprising the magnetic core has a uniform magnetic flux density distribution when energized. Wherein the shape parameter associated with the magnetic flux density distribution of the magnetic core includes: the length of the grooves, the width between adjacent grooves, and the like. In the embodiment, the magnetic flux density distribution of the inductor comprising the magnetic core is more uniform when the inductor is electrified by designing the shape of the magnetic core groove, the magnetic loss of the magnetic core is further reduced, the energy consumption of the inductor is reduced, and meanwhile, the obtained inductor has larger saturation current, so that the inductor has stronger applicability.
In one embodiment, the horizontal cross-section of the magnetic core is any one of the following shapes: circular, square, rectangle, ellipse, trapezoidal, the shape of heliciform recess with the cross-sectional shape phase-match of magnetic core. In this embodiment, the magnetic core provided in the embodiments of the present application can be set to have different shapes according to the requirements of the electronic device for specific applications, so that the magnetic core has stronger applicability.
In one embodiment, the magnetic core is a ferrite core or a metal magnetic powder core. In this embodiment, the magnetic core provided in the embodiments of the present application can be selected according to the requirements of the electronic device for a specific application, so that the magnetic core has a stronger applicability.
Another aspect of the present application provides an inductor, including: a magnetic core according to any of the above; and the shape of the winding is matched with the spiral groove of the magnetic core and is embedded into the spiral groove. In this embodiment, by providing an inductor based on any of the magnetic cores described above, it is possible to: the magnetic flux density of the magnetic core of the inductor is uniformly distributed when the inductor is electrified, so that the magnetic loss of the magnetic core is reduced, the energy consumption of the inductor is reduced, and the obtained inductor has larger saturation current; in addition, the inductor can have an ultra-thin thickness, so that the inductor is particularly suitable for consumer electronic equipment with a large requirement on the ultra-thin thickness, such as mobile phones, flat panels and the like.
In one embodiment, the winding wire of the winding has a cross-sectional shape of: the maximum length in the horizontal direction is greater than the maximum length in the vertical direction. In this embodiment, the thickness of the inductor is further reduced by making the sectional shape of the winding wire a flat shape.
In one embodiment, the winding wire has a rectangular cross-sectional shape.
In one embodiment, the winding comprises at least one layer of planar helical coils each having the same cross-sectional shape in the plane in which it is wound. In this embodiment, the thickness of the inductor is further reduced by making the winding comprise a planar helical coil. By making the winding comprise a multi-layer planar helical coil, the inductance of the inductor can be increased while the increase in the thickness of the inductor is small.
In one embodiment, the winding includes at least two layers of planar helical coils, wherein an insulating layer is disposed between two adjacent layers of coils, and the shape of the insulating layer matches the shape of the at least two layers of planar helical coils.
In one embodiment, the inductor is a power inductor. In this embodiment, the power inductor provided in the embodiments of the present application has the characteristics of small loss, thin thickness, large saturation current, and low cost, and is suitable for various electronic devices, particularly consumer electronic devices.
Another aspect of the present application provides a semiconductor chip, including a substrate and an inductor located on the substrate, where the inductor is any one of the inductors described above.
Another aspect of the present application provides a power supply including any one of the inductors described above.
Another aspect of the present application provides an electronic device, including the semiconductor chip or the power supply.
By combining the above, the inductor provided by the embodiment of the present application has the following beneficial effects: the inductance winding is made into a planar spiral shape and is embedded into the magnetic core groove, so that the magnetic flux density of the magnetic core is uniformly distributed, the magnetic loss of the magnetic core is small, and the saturation current of the inductance is large; the inductor winding is made into a structure with at least one layer of planar spiral coil and wider line width, so that the alternating current resistance of the inductor is smaller, namely, the resistance loss of the inductor is smaller; the inductor winding is made into a planar spiral shape and is embedded into the magnetic core groove, so that the thickness of the inductor is reduced, and the electromagnetic interference of the inductor to the outside is reduced; in addition, the inductor has a simple structure and is easy to manufacture, so that the design and manufacturing cost of the inductor is low.
Drawings
The embodiments of the present application can be made more clear by describing the embodiments with reference to the attached drawings:
FIG. 1 is a schematic diagram of a winding-type inductor in the prior art;
fig. 2 is a schematic diagram of an integrally formed inductor in the prior art;
fig. 3 is a perspective view of an inductor core 31 according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of an inductor 40 according to an embodiment of the present disclosure;
FIG. 5 is a magnetic core flux density distribution diagram of an inductor according to an embodiment of the present disclosure;
fig. 6 is a perspective view of another winding 61 provided in an embodiment of the present application;
fig. 7 is a schematic diagram of a cross-section of the inductor winding 61 shown in fig. 6 in a vertical direction;
fig. 8 is a top view of another inductor core provided in an embodiment of the present application;
fig. 9 is schematic sectional views of six kinds (a) - (f) of winding wires provided in an embodiment of the present application;
fig. 10 is a flowchart of a method for designing an inductor according to an embodiment of the present application;
fig. 11 is a schematic diagram of a semiconductor chip according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.
From the application point of view, the inductor (hereinafter referred to as inductance) in the circuit mainly includes the following three inductances: power inductance, decoupling inductance, high frequency inductance. The power inductor is mainly used for voltage conversion, the decoupling inductor is mainly used for filtering noise on a power line or a signal line, and the high-frequency inductor is mainly used for a radio-frequency circuit and realizing circuits such as deflection, matching, filtering and the like. The inductor provided by the embodiment of the application can be any type of inductor with a magnetic core, including the three types of inductors.
The inductor provided by the embodiment of the application has the beneficial effects of thin thickness, large saturation current, low loss, low cost and the like, and is particularly suitable for being used as a power inductor. Power inductors may be used in a variety of power electronic converters. Taking an inverter as an example, the filtering structure on the inverting side of the inverter generally adopts an LCL structure (L represents a power inductor, and C represents a capacitor), and therefore, the power inductor is a core element of the inverter. Therefore, the improvement of the quality of the power inductor plays an important role in improving the quality of the power electronic converter. The power inductor provided by the embodiment of the application can be suitable for various electronic devices, and is particularly suitable for various consumer electronic devices.
Fig. 3 is a perspective view of an inductor core 31 according to an embodiment of the present application. As shown in fig. 3, the horizontal cross section of the magnetic core 31 is, for example, a square, and a recess 32 is provided at the top of the magnetic core. The vertical cross section of the groove 32 is, for example, a flat rectangle, that is, the width of the rectangle is the groove width of the groove 32, and the height of the rectangle is the height of the groove 32, that is, the groove 32 is a shallow groove having a certain width. Wherein the length, width, and width between adjacent slots (i.e., the wire pitch of the inductor winding wire) of the slots 32 are predetermined during inductor design so as to pass throughThe inductance formed by the magnetic core meets the following requirements: the inductance (L) reaches a predetermined value, the magnetic flux density distribution (B) is uniform, and the AC resistance (R) of the inductanceac) Less than a predetermined value. The inductance (L) corresponds to the inductance of the inductor to the change of the current flowing through the inductor, the larger the inductance is, the larger the induced current generated by the inductor to the current change is, namely, the larger the resistance to the current change is, and the size of the inductance is related to the size of the coil section, the number of turns of the coil and the magnetic core material of the inductor. The alternating current resistor (R)ac) That is, the impedance Z of the inductor is R + i ω L, where R is the dc resistance of the inductor, which is related to the cross-sectional size of the inductor coil and the coil winding length, i ω L is the imaginary part of the impedance Z, ω is the angular velocity of the alternating current, and the impedance Z represents the blocking effect of the inductor on the alternating current. The magnetic flux density (B) is also called magnetic induction and represents a magnetic flux passing through a unit area. This inductor design process will be described in detail below with reference to fig. 10. The core 31 may be made of any core material available in the art, for example, the core 31 may be a ferrite core, or may be a metal magnetic powder core.
Fig. 4 is a schematic structural diagram of an inductor 40 according to an embodiment of the present disclosure. As shown in fig. 4, the inductor 40 includes a winding 41 and a magnetic core 31. The shape of the winding 41 is matched with the shape of the groove 32 in fig. 3, specifically, the winding 41 has the same planar spiral shape as the groove 32, and the cross section of the winding wire of the winding 41 is substantially the same as the cross section of the groove 32, specifically, the cross section of the winding wire of the winding 41 is also in the shape of a flat rectangle, and the length and the width of the cross section of the winding wire are slightly smaller than the length and the width of the cross section of the groove 32, respectively. Thus, the winding 41 can be embedded in the groove 32, constituting the inductor 40. The winding wire of the winding 41 may be a bare metal wire, or may be an enameled wire. After the winding 41 is inserted into the recess 32, both ends of the winding wire of the winding (i.e., the outermost end and the innermost end in the winding 41 in fig. 4) may be connected by a lead wire, respectively, to make a pin or a terminal of the inductor. Then, the upper surface of the inductor 40 may be covered with an insulating film to make a closed type chip inductor or a leaded inductor. Alternatively, the inductor 40 may be made as an open inductor, i.e., the winding 41 is exposed without further processing on the upper surface of the inductor 40, so that the heat dissipation performance of the inductor is better.
In the inductor 40 shown in fig. 4, the magnetic flux density distribution of the magnetic core 31 in the inductor 40 is made uniform by designing the winding group in the spiral shape shown in fig. 4 and making the winding wire of the winding have a specific wire pitch and the number of turns (or length). Fig. 5 is a magnetic flux density distribution diagram of a magnetic core of an inductor according to an embodiment of the present disclosure, where the magnetic flux density distribution diagram is a magnetic flux density distribution diagram of the inductor 40 at a certain current. The squares shown in fig. 5 correspond to the horizontal cross section of the magnetic core 31 shown in fig. 3, where white in fig. 5 represents a slightly smaller magnetic flux density (approximately in the range of 0.01 tesla to 0.1 tesla), lighter gradations in fig. 5 represent a medium-sized magnetic flux density (approximately in the range of 0.1 tesla to 0.3 tesla), and darker gradations in fig. 5 represent a slightly larger magnetic flux density (approximately in the range of 0.3 tesla to 0.45 tesla). As can be seen from fig. 5, in the inductor provided in the embodiment of the present application, when the inductor is energized, the magnetic flux density of most of the horizontal cross section of the entire magnetic core 31 has a magnetic flux density value corresponding to a lighter gray level, the maximum magnetic flux density is only located at the square edge of the center of the magnetic core, and the maximum magnetic flux density is slightly different from the magnetic flux density of the middle size in the magnetic core (for example, about 0.2 tesla). That is, the magnetic flux density distribution in the magnetic core 31 shown in fig. 5 is relatively uniform. The inductor provided by the embodiment of the application can still obtain the magnetic flux density distribution of the magnetic core similar to that in the magnetic core shown in fig. 5 under other currents, namely the inductor provided by the embodiment of the application can enable the magnetic flux density distribution of the magnetic core to be uniform during the working process.
Because the inductance that this application embodiment provided all can make the magnetic flux density distribution of magnetic core even during operation to the difficult condition that local magnetic saturation appears in the magnetic core, thereby makes the magnetic loss of magnetic core less, and makes the saturation current of inductance bigger. The saturation current of the inductor is generally defined as the current value of the inductor which is reduced by 20% when the magnetic core begins to saturate. Meanwhile, in the inductor 40, by making the cross section of the winding wire in a flat shape having a large width, the cross sectional area of the winding wire is large, so that the current distribution on the winding is uniform, and the alternating current resistance of the inductor is small, so that the resistance loss of the winding is reduced. That is, the inductor 40 provided in the embodiments of the present application has a lower magnetic loss and a lower resistive loss, and thus has a higher energy conversion efficiency. In addition, in the inductor 40, by making the cross section of the winding wire in a shape having a small height, the height occupied by the winding wire is reduced, and by embedding the winding 41 in the recess 32 of the magnetic core 31, the influence of the height of the winding wire on the thickness of the inductor is further reduced, so that the inductor 40 can have a very thin thickness. In addition, the winding 41 is embedded in the magnetic core 31, so that the magnetic core 31 plays a role of magnetic shielding, thereby reducing Electromagnetic Interference (EMI) of the inductor 40 to the outside.
It is to be understood that the winding 41 shown in fig. 4 is merely an example of the winding provided by the embodiments of the present application, and that other forms of windings may also be provided by the embodiments of the present application. Fig. 6 is a perspective view of another winding 61 provided in the embodiment of the present application. As shown in fig. 6, this winding 61 includes an upper layer coil 62 and a lower layer coil 64, each of the upper layer coil 62 and the lower layer coil 64 having a planar spiral shape as shown in the winding 41 in fig. 4, and the entirety obtained by overlapping them also has a planar spiral shape so as to be embedded in the groove 32 of the magnetic core 31 shown in fig. 3. The upper coil 62 and the lower coil 64 are connected to each other at respective ends near the center, and the ends of the two coils are connected together by, for example, reflow soldering or ultrasonic soldering. An insulating layer 63 is provided between the upper-layer coil 62 and the lower-layer coil 64. The insulating material of the insulating layer 63 has withstand voltage corresponding to the voltage between the coils.
Fig. 7 is a schematic view of a cross-section in the vertical direction of the inductor winding 61 shown in fig. 6. As shown in fig. 7, the cross section of the winding 61 includes a linear section of the upper layer coil 62, a section of the insulating layer 63, and a linear section of the lower layer coil 64. The vertical cross-sectional shape of the winding 61 matches the cross-sectional shape of the groove 32 shown in fig. 3, so that the winding 61 can be embedded in the groove 32 to constitute the inductance provided by the embodiment of the present application.
It is to be understood that the structure of the winding 61 shown in fig. 6 is merely exemplary, and for example, in the case where the winding 61 is made of an enameled wire, the insulating layer 63 may not be provided between the coil 62 and the coil 64. In addition, the winding 61 shown in fig. 6 is not limited to have two layers of coils, but may have multiple layers of coils, such as three layers, four layers, etc., according to the requirement of inductance.
In one embodiment, the winding for embedding the above-described magnetic core 31 is not limited to have a planar spiral shape, but may have a three-dimensional spiral shape, that is, the winding wire of the winding is wound not in one plane but in one three-dimensional space, and adjacent two turns of the winding wire have a predetermined interval in the vertical direction as long as it can be embedded in the magnetic core 31.
Although the magnetic core of the inductor provided in the embodiments of the present application is illustrated as having a square cross section in the horizontal direction, the embodiments of the present application are not limited thereto. Fig. 8 is a top view of another inductor core according to an embodiment of the present application. As shown in fig. 8, the magnetic core 81 has a circular horizontal cross section, and the top thereof includes a spiral groove 82 (shown by gray shading in the drawing). The shape of the spiral groove 82 matches the circular cross-section of the core. For this magnetic core 81, accordingly, the shape of the winding for embedding in the groove 82 also matches the shape of the groove 82. It is understood that the inductor core provided in the embodiments of the present application may also have any other horizontal cross-sectional shape, such as a rectangle, an ellipse, a trapezoid, etc., which is not limited thereto.
Although the cross section of the winding wire of the inductor provided in the embodiments of the present application is illustrated as a flat rectangle, the embodiments of the present application are not limited thereto, and the cross section of the winding wire of the inductor provided in the embodiments of the present application may have other various shapes, such as a square shape, a circular shape, a semicircular shape, and the like. Preferably, the cross section of the winding wire has a flat shape, so that the thickness of the inductor can be reduced. Fig. 9 is schematic cross-sectional views of six kinds (a) - (f) of winding wires provided in an embodiment of the present application. As shown in fig. 9, in the (a) -type section, the upper edge of the section of the winding wire is a straight line, the lower edge of the section is a curved line, the overall shape thereof is flat, so that the height of the winding wire is small, and the curved lower edge thereof makes the core recess of the corresponding inductor easier to form. In the (b) type section, the section of the winding wire is different from the (a) type section in that the upper edge in the (b) type section is a curve protruding upward, thereby increasing the sectional area of the winding wire in addition to the above-mentioned advantageous effects of the (a) type, thereby reducing the resistance of the winding and reducing the power consumption of the inductor. In the (c) type section, the winding wire section is different from the (b) type section in that both ends of the upper edge of the (c) type section are connected to both ends of the lower edge by two straight lines, thereby further increasing the sectional area of the winding wire, and at the same time, the two straight lines are inclined inward at an angle such that the winding is easily inserted into the core groove. In the (d) type section, the winding wire has an inverted trapezoidal shape in section, the upper and lower edges of which are both horizontal straight lines, thus being suitable for a winding having a multi-layered coil, and the inverted trapezoidal shape thereof facilitates the winding to be inserted into the core recess. In the section (e), the straight lines on both sides of the inverted trapezoid in the section (d) are changed into curves, so that the sectional area of the winding wire can be increased, the alternating current resistance of the winding can be reduced, and the energy consumption of the inductor can be reduced. In the (f) type cross section, the difference with the (d) type cross section is that the straight line at the bottom of the trapezoid in the (d) type cross section is changed into a curve, so that the cross section area of the winding wire is increased, the alternating current resistance of the winding is reduced, and the energy consumption of the inductor is reduced.
Fig. 10 is a flowchart of a method for designing an inductor according to an embodiment of the present application. As shown in fig. 10, first, in step S101, winding parameters are set. The winding parameters comprise the number of turns N of the coil, the line width W and the line spacing D. In initially setting the parameters, the designer may empirically set the parameters N, W and D based on the desired electrical parameters of the inductor. The electrical parameters include inductance L, magnetic flux density B, and AC resistance RacAnd the like. The designer can first set the parameter N to meet the requirement of the inductance L, then set the parameter W accordingly, and finally set the parameter D accordingly.
In step S102, it is calculated whether the inductance of the inductor with the set parameter at the given operating frequency is greater than a predetermined value. In this step, the designer can use simulation software to calculate whether the inductance of the inductor with the set parameters at a given operating frequency is greater than a predetermined value. If L is larger than the predetermined value, the process proceeds to step S103, and if L is smaller than or equal to the predetermined value, the process returns to step S101 to reset the winding parameters.
The following equation (1) is an empirical equation for calculating the inductance of the inductor.
Wherein, mu0Is a vacuum permeability, mu0＝4π*10-7Newton/ampere2，μsIs the relative permeability of the magnetic core, N is the number of winding turns, S is the cross-sectional area of the winding wire, l is the length of the winding, and k is a coefficient, which is the ratio of the radius of the winding coil to the winding length. In the inductor provided in the embodiment of the present application, if the inductor winding is a single-layer winding 41 as shown in fig. 4, N is the number of turns of the winding 41, and if the inductor winding is a double-layer winding 61 as shown in fig. 6, N is the sum of the number of turns of the two-layer winding. Because the winding provided by the embodiment of the application has a planar spiral structure, the coil sectional areas corresponding to the windings of the turns in the winding coil are different, and therefore more accurate inductance can be obtained by calculating through simulation software.
It can be seen from formula (1) that the winding turns of the inductor have the greatest influence on the magnitude of inductance L, and the more the turns, the greater the inductance. The sectional area of the winding coil also influences the inductance, and the larger the sectional area is, the larger the inductance is. The length of the winding also affects the inductance, with longer lengths yielding less inductance. Therefore, when adjusting the setting parameter of the inductance, it is preferable to adjust the number of winding turns so that the inductance L is larger than a predetermined value, that is, so that the inductance L approximately satisfies a predetermined requirement, and then adjust the line width W and the line pitch D of the winding coil so that the inductance meets the requirements of the magnetic flux density and the alternating current resistance.
In step S103, it is calculated whether or not the magnetic flux density B distribution is uniform.
This step can also be performed by using simulation software. The magnitude of the local magnetic flux density of the magnetic core is correlated with the magnitude of the local inductance L of the inductor, and the larger the local inductance L, the larger the local magnetic flux density. Therefore, in the calculation, usually, the inductance L of each portion of the core is calculated, and the magnetic flux density is calculated based on each local inductance value. If the magnetic flux density distribution is determined to be uniform, the process proceeds to step S104, and if the magnetic flux density distribution is determined to be non-uniform, the process returns to step S101 to reset the winding parameters.
If it is determined that the magnetic flux density distribution is not uniform, the magnetic flux density of the magnetic core can be adjusted by adjusting the line width W and the line interval D of the winding coil, for example. For example, by adjusting the line width of the coil, that is, adjusting the size of the inner diameter of the coil, the magnetic flux density at the center of the core can be adjusted, and the size of the magnetic flux density at the center of the core and the magnetic flux density at the edge of the core are balanced. For example, referring to the above formula (1), the smaller the coil area, the smaller the inductance, and thus, by setting the inner diameter of the coil to be small by adjusting the coil line width W, the magnetic flux density at the center of the magnetic core can be made small. By adjusting the wire pitch D of the winding coil, the inductance of each local part can be adjusted, so that the magnetic flux density distribution is uniform.
In step S104, the AC resistance R is calculatedacWhether less than a predetermined value.
This step can also be performed by using simulation software. In general, as described above, the direct current resistance among the alternating current resistances of the winding coils is determined based on the sectional size of the winding wire and the length of the winding wire, and the larger the sectional area of the winding wire, the smaller the direct current resistance, and the longer the length of the winding wire, the larger the direct current resistance. Therefore, by adjusting the number of turns N, the line width W and the line interval D, the cross-sectional size of the winding wire and the length of the winding wire can be adjusted, thereby adjusting the alternating current resistance R of the windingac. If R isacAnd if the set winding parameter is less than the preset value, the set winding parameter enables the obtained inductance to meet the preset requirement, and therefore the set winding parameter can be determined as the parameter of the inductance. If R isacIf the value is larger than the predetermined value, the process returns to step S101 to reset the winding parameters.
The inductor provided by the embodiment of the application has the following beneficial effects: the inductance winding is made into a planar spiral shape and is embedded into the magnetic core groove, so that the magnetic flux density of the magnetic core is uniformly distributed, the magnetic loss of the magnetic core is small, and the saturation current of the inductance is large; the inductor winding is made into a structure with at least one layer of planar spiral coil and wider line width, so that the alternating current resistance of the inductor is smaller, namely, the resistance loss of the inductor is smaller; the inductor winding is made into a planar spiral shape and is embedded into the magnetic core groove, so that the thickness of the inductor is reduced, and the electromagnetic interference of the inductor to the outside is reduced; in addition, the inductor has a simple structure and is easy to manufacture, so that the cost of the inductor is low.
Another aspect of the present application provides a semiconductor chip, including a substrate and an inductor located on the substrate, where the inductor is any one of the inductors described above. A semiconductor chip, which may also be referred to as an integrated circuit, refers to a semiconductor device that performs a function and is formed on a semiconductor substrate, which may be a semiconductor material such as silicon, gallium arsenide, gallium nitride, or silicon carbide. The semiconductor chip can be used, for example, as a control chip in various electronic devices, a control chip in various electronic units, such as a control chip in a power supply, and the like. Fig. 11 is a schematic diagram of a semiconductor chip according to an embodiment of the present application. As shown in fig. 11, the semiconductor chip 110 includes a substrate 111 and an inductor 112, where the inductor 112 is an inductor provided in the embodiment of the present application. Since the thickness of the inductor 112 is thin, the semiconductor chip 110 is not greatly raised in height after the inductor 112 is mounted on the substrate 111, so that the semiconductor chip 110 after packaging also has a thin thickness. In addition, due to the characteristics of the inductor provided by the embodiment of the application, the semiconductor chip has the characteristics of low loss, thin thickness, large current and low cost.
Another aspect of the present application provides a power supply including any one of the inductors described above. Such as an Uninterruptible Power Supply (UPS), an ac switching Power Supply, a dc switching Power Supply, and the like. Inductors included in the power supply may be used to provide energy storage, filtering, and the like. In the power supply, the inductor provided by the embodiment of the present application is mounted on the printed circuit board, and similarly to fig. 11, since the inductor provided by the embodiment of the present application has a thin thickness, the inductor does not give a large increase in height to the entire power supply after being mounted on the printed circuit board. Therefore, by including the inductor provided by the embodiment of the application in the power supply, the power supply has the characteristics of low loss, thin thickness, high current and low cost.
Another aspect of the present application provides an electronic device, including the semiconductor chip or the power supply. The electronic device is, for example, an electronic device such as a computer, a mobile phone, a tablet, a portable smart device, a vehicle-mounted device, a television, and a teller machine, which is not specifically limited in this embodiment of the present application. By including the semiconductor chip and/or the power supply according to the embodiment of the application in the electronic device, the electronic device has the characteristics of low loss, thin thickness, high current and low cost.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (12)
1. An inductance core, characterized in that the top surface of the core has a spiral groove for embedding an inductance winding;
wherein the shape of the helical groove makes a magnetic flux density distribution of an inductor including the magnetic core uniform when energized.
2. An inductor core according to claim 1, wherein the horizontal cross-section of the core has any one of the following shapes: circular, square, rectangle, ellipse, trapezoidal, the shape of heliciform recess with the cross-sectional shape phase-match of magnetic core.
3. An inductor core according to any of claims 1 or 2, characterized in that said core is a ferrite core or a metal magnetic powder core.
4. An inductor, comprising: an inductor core according to any one of claims 1-3; and the shape of the winding is matched with the spiral groove of the inductance magnetic core and is embedded into the spiral groove.
5. The inductor according to claim 4, wherein a cross-sectional shape of a winding wire of the winding is: the maximum length in the horizontal direction is greater than the maximum length in the vertical direction.
6. The inductor according to claim 5, wherein the winding wire has a rectangular cross-sectional shape.
7. An inductor according to any one of claims 4-6, characterized in that the winding comprises at least one layer of planar helical coils.
8. The inductor of claim 7, wherein the winding comprises at least two layers of planar helical coils, wherein an insulating layer is disposed between adjacent layers of coils.
9. An inductor according to claim 6 or 8, characterized in that the inductor is a power inductor.
10. A semiconductor chip comprising a substrate and an inductor located over the substrate, the inductor being the inductor of any one of claims 4-9.
11. A power supply comprising an inductor as claimed in any one of claims 4 to 9.
12. An electronic device comprising the semiconductor chip of claim 10 or the power supply of claim 11.
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| CN117809971A (en) * | 2024-01-26 | 2024-04-02 | 浙江三钛科技有限公司 | Manufacturing method of high-density integrated inductor |
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