Inductor, inductor assembly and electronic equipment

Abstract

The utility model provides an inductor, an inductor assembly and electronic equipment, and relates to the technical field of inductors.The inductor comprises a magnetic ring and a coil, the coil comprises at least two windings which are sequentially arranged in the circumferential direction of the magnetic ring, and the at least two windings are sequentially connected in series in the circumferential direction of the magnetic ring; and each winding comprises at least three winding layers which are nested from inside to outside and are connected in series. According to the inductor, the stray capacitance of the coil can be effectively reduced, the impedance of the inductor at a high frequency band can be increased, and the electromagnetic compatibility characteristic of the inductor is improved.

Description

Technical Field

[0001] The present application belongs to the field of inductor technology, and more specifically, relates to an inductor, an inductor component, and an electronic device. Background Art

[0002] Inverter circuits or power factor correction circuits in some electronic devices require power inductors for power conversion.

[0003] Power inductors generally consist of a magnetic ring and a coil wound around it. To achieve a certain power inductance, a magnetic ring with a lower u value needs to be wound with more turns and layers to achieve the required inductance. Currently, the coils in inductors are all wound sequentially, that is, multiple layers are tightly wound in a clockwise or counterclockwise direction. This winding method is relatively simple, has a high degree of automation, and has relatively stable distributed capacitance parameters.

[0004] However, there are a large number of complex parasitic capacitance and leakage inductance problems between the layers of sequential winding, resulting in poor circuit stability. Utility Model Content

[0005] The purpose of the embodiments of the present application is to provide an inductor, an inductor assembly, and an electronic device to solve the problem of a large amount of parasitic capacitance and leakage inductance in existing inductors.

[0006] To achieve the above objectives, in a first aspect, the present application provides an inductor, comprising:

[0007] Magnetic ring;

[0008] The coil includes at least two windings arranged in sequence along the circumference of the magnetic ring, at least two of the windings are connected in series in sequence along the circumference of the magnetic ring, and each of the windings includes at least three layers of winding layers nested from the inside to the outside and connected in series.

[0009] In some embodiments of the first aspect, the winding includes three layers of the winding layers, and the three layers of the winding layers include:

[0010] a first winding layer, wound around the magnetic ring along a first direction;

[0011] a second winding layer, wound along a second direction around the outside of the first winding layer and connected in series with the first winding layer;

[0012] a third winding layer, wound along a third direction around the outer side of the second winding layer and connected in series with the second winding layer;

[0013] The first direction, the second direction and the third direction are respectively one of a clockwise direction and a counterclockwise direction.

[0014] In some embodiments of the first aspect, a plurality of the windings are connected in series in sequence along the first direction.

[0015] In some embodiments of the first aspect, a gap is provided between every two adjacent windings.

[0016] In some embodiments of the first aspect, the sum of the central angles corresponding to all the windings is less than 360°.

[0017] In some embodiments of the first aspect, the invention further includes a first connecting line and a second connecting line, wherein the first connecting line is connected to the input end of the coil, and the second connecting line is connected to the output end of the coil.

[0018] In some embodiments of the first aspect, the first connecting wire and the second connecting wire are spirally wound around each other to form a twisted wire structure.

[0019] In some embodiments of the first aspect, a first terminal is provided at one end of the first connecting wire facing away from the coil, and a second terminal is provided at one end of the second connecting wire facing away from the coil.

[0020] In a second aspect, the present application provides an inductor assembly, comprising a housing and the inductor described in the first aspect and any optional embodiment thereof, wherein the housing has a cavity, and the inductor is installed in the cavity.

[0021] In a third aspect, the present application further provides an electronic device comprising the inductive component as described in the second aspect.

[0022] The beneficial effects of the inductor, inductor assembly, and electronic device provided in the present application are as follows: compared with the prior art, the coil composed of at least two winding sections, each winding including at least three winding layers, can increase the inductance density of the inductor, provide more inductance values ​​under the same volume, and can effectively reduce the parasitic capacitance of the coil. It can also increase the impedance of the inductor in the high frequency band and improve the electromagnetic compatibility characteristics of the inductor. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0024] Figure 1 Schematic diagram of the structure of the inductor in the embodiment of the present application;

[0025] Figure 2 for Figure 1A front view of the inductor shown in;

[0026] Figure 3 for Figure 2 Cross-sectional view in the AA direction;

[0027] Figure 4 Schematic diagram of the coil winding path in an embodiment of the present application;

[0028] Figure 5 for Figure 3 A partial view of the .

[0029] Among them, the reference numerals in the figures are:

[0030] 100-magnetic ring; 200-coil; 201-access end; 202-output end; 210-first winding; 220-second winding; 230-third winding; 240-fourth winding; 211-first winding layer; 212-second winding layer; 213-third winding layer; 300-first connecting line; 400-second connecting line; 10-first direction; 20-second direction; 30-third direction. DETAILED DESCRIPTION

[0031] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0032] It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0033] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0035] In a first aspect, embodiments of the present application provide an inductor that can be used as an inverter inductor or a power factor correction (PFC) inductor.

[0036] Reference Figure 1 、 Figure 2 and Figure 3 The inductor provided in the embodiment of the present application includes a magnetic ring 100 and a coil 200. The coil 200 includes at least two windings arranged in sequence along the circumference of the magnetic ring 100. The at least two windings are sequentially connected in series along the circumference of the magnetic ring 100, and each winding includes at least three layers of windings nested from the inside out and connected in series.

[0037] The magnetic ring 100 is annular and can be made of Sendust or Iron Silicon, which offer the advantages of high saturation magnetic flux density, excellent DC bias, and low loss. Furthermore, the magnetic ring 100 can be configured as a rectangular ring, an elliptical ring, or other irregular shapes depending on the application requirements.

[0038] It is understood that the multiple windings can be different parts of the coil 200, that is, multiple windings can be wound using the same wire. Alternatively, the coil 200 can be formed by winding each winding using different wires and then connecting adjacent windings in series. Similarly, the multiple winding layers can be different parts of the same winding, that is, multiple winding layers can be wound using the same wire to form a single winding, or multiple winding layers can be wound using multiple wires and then connected in series to form a single winding.

[0039] In this embodiment, the coil 200 includes four windings: a first winding 210, a second winding 220, a third winding 230, and a fourth winding 240. The first winding 210 to the fourth winding 240 are arranged in series along a first direction 10, and each winding includes three layers of windings nested from the inside out. The first direction 10 is a clockwise direction. That is, when the coil 200 is wound on the magnetic ring 100, the first winding 210, the second winding 220, the third winding 230, and the fourth winding 240 are wound in a clockwise direction. Alternatively, the first direction 10 can be a counterclockwise direction.

[0040] It can be understood that the potential of each winding in the inductor is linearly distributed, and the electric field energy is concentrated and stored between the layers of each winding. Assuming that the capacitance of the interlayer capacitor formed between the winding layers is C, the interlayer charge is q, and the potential difference between the corresponding two adjacent winding layers is U1-U2, the energy stored in the capacitor is:

[0041]

[0042] From the perspective of electric field, the energy stored in the capacitor can be calculated as:

[0043]

[0044] For the same capacitor in the same state, the energy W expressed in the two ways above should be equal, so the following equations 1 and 2 can be combined to obtain:

[0045]

[0046] From formula 3 and formula 4, we can know that as long as the potential difference U1-U2 of the capacitor is given, the capacitance of the capacitor can be obtained. The formula for extracting parasitic capacitance is:

[0047]

[0048] The parasitic capacitance C generated by the multi-segment winding and the winding method with multiple winding layers in each winding can be derived by the energy calculation method of capacitance. Effect , to compare the differences in parasitic capacitance under different winding methods. The specific comparison method is as follows:

[0049] Assuming the capacitance between the two layers of sequential winding is C0, then:

[0050]

[0051]

[0052] Assuming the capacitance between the windings of the three-layer sequential winding method is C0, then:

[0053]

[0054] From formula 10 and formula 14, we can know that when the coil adopts the n-layer winding method, the parasitic capacitance is:

[0055]

[0056] When the coil is divided into m winding segments and each winding has n winding layers, the parasitic capacitance generated by the winding method is:

[0057]

[0058] Combining Formula 15 and Formula 16, the three-layer sequential winding method is compared with the winding method of the embodiment of the present application with four groups of windings and each winding including three winding layers. The parasitic capacitance C of the coil wound in three layers in sequence is Effect =8 / 27*C0, the parasitic capacitance C of the coil provided in the embodiment of the present application Effect =0.0185*C0. Therefore, compared to the prior art, the parasitic capacitance of the inductor in the embodiment of the present application is reduced by at least 93.7%. Furthermore, the impedance of the corresponding frequency band can be improved to a certain extent, while also increasing the resonant frequency and improving the stability of the circuit operation.

[0059] In some embodiments, the three winding layers include: a first winding layer 211, a second winding layer 212, and a third winding layer 213. The first winding layer 211 is wound around the magnetic ring 100 along a first direction 10; the second winding layer 212 is wound around the outside of the first winding layer 211 along a second direction 20 and connected in series with the first winding layer 211; and the third winding layer 213 is wound around the outside of the second winding layer 212 along a third direction 30 and connected in series with the second winding layer 212. The first direction 10, the second direction 20, and the third direction 30 are respectively one of clockwise and counterclockwise. The input end 201 of the first winding layer 211 is the input end 201 of the winding, and the output end 202 of the third winding layer 213 is the output end 202 of the winding.

[0060] Reference Figure 4 and Figure 5 In this embodiment, the first direction 10 and the third direction 30 are clockwise, and the second direction 20 is counterclockwise. That is, the first winding layer 211 is wound around the magnetic ring 100 in a clockwise direction. After the first winding layer 211 is wound, the second winding layer 212 is wound counterclockwise, using the end of the winding of the first winding layer 211 as the starting end, and is wound around the outside of the first winding layer 211. Similarly, the third winding layer 213 is wound again in a clockwise direction, using the end of the winding of the second winding layer 212 as the starting end, and is wound around the outside of the second winding layer 212. In addition, the first direction 10, the second direction 20 and the third direction 30 can also be exactly the same, for example, they are all clockwise. After the first winding layer 211 is wound, the wire is pulled from the winding end end of the first winding layer 211 to the side of the winding starting end of the first winding layer 211 and the second winding layer 212 is wound in a clockwise direction, and the third winding layer 213 is wound in a clockwise direction using the same method.

[0061] It can be understood that the winding starting end of the first winding layer 211 is the winding starting end of the entire winding, and the winding terminating end of the third winding layer 213 is the winding terminating end of the entire winding.

[0062] Multiple windings can be sequentially connected in series along the first direction 10. For example, when the first direction 10 is clockwise, the first winding 210, the second winding 220, the third winding 230, and the fourth winding 240 are sequentially wound in the clockwise direction. The winding start end of the second winding 220 is connected to the winding end end of the first winding 210, the winding start end of the third winding 230 is connected to the winding end end of the second winding 220, and the winding start end of the fourth winding 240 is connected to the winding end end of the third winding 230, thereby achieving the sequential connection of multiple windings in series along the first direction 10.

[0063] In some embodiments, multiple windings can be arranged with equal lengths. That is, the wire length required to wind each winding is the same. This ensures that the winding range of each winding on the magnetic core and the number of turns per winding layer in each winding are the same, further reducing parasitic capacitance and improving stability. Furthermore, if the number of turns of coil 200 cannot be evenly divided among each winding, the lengths of each winding can also be different.

[0064] In some embodiments, a gap is provided between each pair of adjacent windings. After the previous winding is wound, the guide wire should be pulled or passed around one end of the magnetic core before the next winding is wound, thereby forming a gap between the two adjacent windings. The gaps between the windings can be the same or different in size.

[0065] Specifically, the winding range of each winding on the magnetic ring 100 corresponds to a central angle, and the sum of the central angles corresponding to all windings should be less than 360° so that gaps can be generated between adjacent windings. In this embodiment, the coil 200 has four windings, which are evenly distributed along the circumference of the magnetic ring 100, and the central angle α corresponding to each winding is less than 90°, thereby forming gaps with the same spacing between adjacent windings. In addition, when the length of each winding is different, the central angle corresponding to each winding can also be different. Ensuring that the sum of the central angles corresponding to all windings is less than 360° can form gaps between adjacent windings. By providing gaps, adjacent windings can be prevented from being too close to each other, reducing interference between windings, and further improving the stability of the inductor.

[0066] like Figure 3As shown, it can be understood that, among the multiple windings connected in series, the winding starting end of the first winding 210 is the input end 201 of the entire coil 200, and the winding ending end of the fourth winding 240 is the output end 202 of the entire coil 200. When the coil 200 is connected to a circuit board, the input end and the output end 202 of the coil 200 are respectively connected to two contacts of the circuit board.

[0067] like Figure 4 As shown, in some embodiments, the inductor further includes a first connecting line 300 and a second connecting line 400 , wherein the first connecting line 300 is connected to the input end 201 of the coil 200 , and the second connecting line 400 is connected to the output end 202 of the coil 200 .

[0068] The first connecting wire 300 and the second connecting wire 400 are both conductive wires, such as copper wires. It is understood that the first connecting wire 300, the second connecting wire 400, and the coil 200 can be different parts of the same conductive wire. That is, when winding the coil 200 on the magnetic ring 100, sufficient lengths of conductive wire are reserved before the starting position and after the ending position of the winding to form the first connecting wire 300 and the second connecting wire 400 that are respectively connected to the input end 201 and the output end 202 of the coil 200. Furthermore, the first connecting wire 300 and the second connecting wire 400 can also be connected to the input end 201 and the output end 202 of the coil 200 after the coil 200 is wound.

[0069] The first connecting wire 300 and the second connecting wire 400 can be used to connect the coil 200 to the circuit board. For example, when the inductor is used in a photovoltaic inverter, since photovoltaic inverters are often used outdoors, the inverter chassis is usually set as a closed structure for waterproofing. Therefore, to ensure the normal use of the inductor, the inductor can be hung outside the chassis and connected to the circuit board inside the chassis via the first connecting wire 300 and the second connecting wire 400.

[0070] In some embodiments, the first connecting wire 300 and the second connecting wire 400 are spirally wound around each other to form a twisted wire structure.

[0071] The first and second connecting wires 300 and 400 can be wound around each other in opposite directions to form a tightly twisted wire structure. This twisted wire structure can increase the lead inductance and improve high-frequency characteristics. It can also effectively reduce electromagnetic interference, improve the anti-interference ability of the coil 200, and ensure stable signal transmission.

[0072] The twisted wire structure can have a fixed or variable winding pitch. Fixed-pitch twisted wire structures provide uniform stranding, while variable-pitch twisted wire structures offer improved anti-interference performance at different frequencies. The twisted wire pitch can be optimized based on actual application requirements to achieve optimal electromagnetic compatibility.

[0073] Furthermore, a first terminal may be provided at one end of the first connecting wire 300 away from the coil 200, and a second terminal may be provided at one end of the second connecting wire 400 away from the coil 200. The terminals may be made of various materials and shapes to meet different connection requirements.

[0074] In a second aspect, an embodiment of the present application further provides an inductor assembly, comprising a housing and the inductor provided in the embodiment of the first aspect, wherein the housing has a cavity, and the inductor is installed in the cavity.

[0075] The shape of the housing can be arbitrary and is not limited in this embodiment. The housing can be an anodized housing, for example, made of aluminum. By applying an electric current to the electrolyte, a dense oxide film forms on the surface of the housing, providing excellent corrosion resistance and insulation properties. This also enhances its adaptability to the environment and extends the service life of the inductor component. The inductor can be secured within the cavity by bonding or fasteners. Furthermore, the cavity can be filled with a thermally conductive potting compound to improve the heat dissipation, waterproofing, and dustproofing of the inductor component.

[0076] By encapsulating the inductor inside the housing, on the one hand, the inductor can be protected, and on the other hand, the heat dissipation effect of the inductor can be improved to ensure stable operation of the inductor.

[0077] In a third aspect, embodiments of the present application further provide an electronic device comprising the inductor assembly provided in the embodiment of the second aspect. The electronic device may be a photovoltaic inverter or an uninterruptible power supply, and by using the inductor of the embodiment of the first aspect, wherein the coil 200 in the inductor has at least two windings, each of which has at least three winding layers, the inductor's inductance density can be increased, providing a higher inductance value within the same volume, effectively reducing the generation of parasitic capacitance, and improving the frequency band impedance and resonant frequency, thereby enabling the electronic device to have higher electromagnetic compatibility and ensuring stable operation of the electronic device.

[0078] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. An inductor, characterized in that: include: Magnetic ring; The coil includes at least two windings arranged in sequence along the circumference of the magnetic ring, at least two of the windings are connected in series in sequence along the circumference of the magnetic ring, and each of the windings includes at least three layers of winding layers nested from the inside to the outside and connected in series.

2. The inductor according to claim 1, wherein The winding includes three layers of winding layers, and the three layers of winding layers include: a first winding layer, wound around the magnetic ring along a first direction; a second winding layer, wound along a second direction around the outside of the first winding layer and connected in series with the first winding layer; a third winding layer, wound along a third direction around the outer side of the second winding layer and connected in series with the second winding layer; The first direction, the second direction and the third direction are respectively one of a clockwise direction and a counterclockwise direction.

3. The inductor according to claim 2, wherein: The plurality of windings are sequentially connected in series along the first direction.

4. The inductor according to claim 3, wherein: A gap is provided between each two adjacent windings.

5. The inductor according to claim 4, wherein: The sum of the central angles corresponding to all the windings is less than 360°.

6. The inductor according to any one of claims 1 to 5, characterized in that: It also includes a first connecting line and a second connecting line, wherein the first connecting line is connected to the input end of the coil, and the second connecting line is connected to the output end of the coil.

7. The inductor according to claim 6, wherein: The first connecting wire and the second connecting wire are spirally wound around each other to form a twisted wire structure.

8. The inductor according to claim 6, wherein: A first terminal is provided at one end of the first connecting wire away from the coil, and a second terminal is provided at one end of the second connecting wire away from the coil.

9. An inductor component, characterized in that: The invention comprises a housing and the inductor according to any one of claims 1 to 8, wherein the housing has a cavity, and the inductor is installed in the cavity.

10. An electronic device, characterized in that: Comprising the inductor assembly as claimed in claim 9.

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