CN221175932U - Inductance and electronic device - Google Patents

Abstract

The present application provides an inductor and an electronic device, which relate to the technical field of inductor structure design and are applied to electronic devices. The inductor comprises a magnetic core and a coil. The magnetic core is a symmetrical structure, and the coil is wound on the magnetic core. The coil comprises a winding, and the winding comprises a plurality of winding segments. The plurality of winding segments are distributed in two winding areas of the magnetic core. The two winding areas are respectively located on two symmetrical sides of the magnetic core, and the number of winding segments wound on one winding area is greater than the number of winding segments wound on the other winding area. By making the number of winding segments wound on the two winding areas on the magnetic core different, a plurality of parasitic capacitors are constructed, so that the resonance point is changed from a single frequency to a plurality of resonance frequencies, which is beneficial to improving the impedance of the PFC inductor.

Description

Inductors and electronic devices

Technical Field

The present application relates to the technical field of inductor structure design, and in particular to an inductor and an electronic device.

Background technique

Inductors such as transformers and inductors are core unit devices for achieving high efficiency and miniaturization in products such as switching power supplies. Toroidal inductors (Power Factor CorrecTIon, PFC) are usually used in products such as switching power supplies. Due to the constraints of PFC function and efficiency, the number of turns and magnetic core of the PFC inductor cannot be significantly changed.

However, the impedance of the current FPC inductor is too small to meet the needs of some application scenarios. The impedance of the PFC inductor can be increased by reducing the parasitic capacitance of the PFC inductor, but this will increase the turn-to-turn distance of the PFC inductor and increase the volume of the PFC inductor. At the same time, the presence of parasitic capacitance will cause high-frequency resonance, requiring more types of filters, which increases the complexity of using the FPC inductor.

Utility Model Content

The present application provides an inductor and an electronic device. By constructing asymmetric multiple winding segments on a magnetic core and multiple parasitic capacitors, the resonance point is changed from a single frequency to multiple resonance frequencies, thereby solving the problem that it is difficult to increase the impedance of the PFC inductor.

In a first aspect, the present application provides an inductor, comprising a magnetic core and a coil, wherein the magnetic core is a symmetrical structure, and the coil is wound on the magnetic core; the coil comprises a winding, and the winding comprises a plurality of winding segments, and the plurality of winding segments are distributed in two winding areas of the magnetic core, and the two winding areas are respectively located on two symmetrical sides of the magnetic core, and the number of the winding segments wound on one of the winding areas is greater than the number of the winding segments wound on the other winding area.

The present application adopts a magnetic core body with a symmetrical structure, and a coil is wound on the magnetic core body to form a plurality of winding segments, and two winding areas are set on both sides of the magnetic core body symmetrically, so that the plurality of winding segments are distributed in the two winding areas, and the number of winding segments wound on one winding area is greater than the number of winding segments wound on the other winding area, so that the winding segments in the two winding areas form an asymmetrically distributed winding structure, which is conducive to constructing a plurality of parasitic capacitors, so that the resonance point changes from a single frequency to a plurality of resonance frequencies, improves the phase of the impedance, and increases the capacitive reactance. Without eliminating the parasitic capacitor, multiple parasitic capacitors are actively constructed, so that the multiple resonance points of the high-frequency resonance are balanced with each other, avoiding the existence of common-mode interference, and helping to solve the influence of the parasitic capacitor generated by the PFC inductor on the high-frequency band.

In a possible implementation manner, any one of the winding segments is entirely located within one of the winding areas.

In a possible implementation manner, the conductive wires of two adjacent winding segments are one conductive wire, and the conductive wire includes a connecting segment located between the two adjacent winding segments, and the connecting segment extends along the circumference of the magnetic core.

In a possible implementation, the winding segment includes a first winding segment, a second winding segment, and a third winding segment that are adjacent to each other in sequence, the wire of the first winding segment, the wire of the second winding segment, and the wire of the third winding segment are one wire, the first winding segment is located in one winding area, and the second winding segment and the third winding segment are located in another winding area.

In a possible implementation manner, in the circumferential direction of the magnetic core, an extension length of the second winding segment is equal to an extension length of the third winding segment.

In a possible implementation, the first winding segment, the second winding segment and the third winding segment each include multiple winding layers to form a multi-layer winding structure, and the number of layers of the winding layers of the first winding segment, the second winding segment and the third winding segment are the same.

In a possible implementation manner, an end of the first winding segment facing away from the second winding segment has a first pin, and an end of the third winding segment facing away from the second winding segment has a second pin.

In a possible implementation manner, the first pin and the second pin are respectively located on two sides of a symmetry axis of the magnetic core.

In a possible implementation, the magnetic core is in the shape of a circular ring, and the plurality of winding segments are distributed at intervals on the circular ring; or, the magnetic core is in the shape of a rectangular ring, and the plurality of winding segments are distributed on two opposite sides of a pair of the rectangular ring.

In a second aspect, the present application provides an electronic device, comprising a circuit board and an inductor as described in any one of the above items, wherein the inductor is electrically connected to the circuit board.

The present application directly positions and connects the magnetic core and the coil, and directly forms pin portions on some of the coils directly positioned and connected on the magnetic core, and/or directly positions and connects the pin portions at some of the coils. The inductor is composed of only the necessary magnetic core and coil by means of direct positioning connection such as gluing, and directly forms the pin portions at the coil or directly positions and connects the pin portions. The pin portions are fixed and positioned on the outer surface of the same side of the magnetic core, and there is no need to position the pins through auxiliary mechanisms such as a skeleton or a base plate. The structural design is simpler, the product volume is effectively reduced, the proportion of coil per unit volume is increased, and the power density of the inductor is effectively improved.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments of the present application will be described below.

FIG1 is a schematic diagram of the structure of a first inductor provided in an embodiment of the present application;

FIG2 is a schematic diagram of the structure of a second inductor provided in an embodiment of the present application;

FIG3 is a schematic diagram of the structure of a third inductor provided in an embodiment of the present application;

FIG4 is a schematic diagram of the structure of a fourth inductor provided in an embodiment of the present application;

FIG5 is a diagram showing the measured waveforms of common-mode noise and differential-mode noise of an inductor provided in an embodiment of the present application;

FIG. 6 is a diagram showing the measured waveforms of the common-mode noise and differential-mode noise of an inductor in the prior art.

Detailed ways

The embodiments of the present application are described below in conjunction with the drawings in the embodiments of the present application.

It should be clear that the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

It should be understood that the term "and/or" used in this article is only a description of the same field of the associated objects, indicating that there can be three relationships. For example, A and/or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character "/" in this article generally indicates that the associated objects before and after are in an "or" relationship.

For ease of understanding, the English abbreviations and related technical terms involved in the embodiments of the present application are explained and described below.

The present application provides a specific implementation of an inductor, which is applied to an electronic device and is arranged in a power conversion circuit between an input power supply and an electrical device of the electronic device, and is used to supply power to the electrical device after performing voltage conversion on the input power supply, and/or is used to supply power to the electrical device after performing filtering and regulation on the voltage of the input power supply.

Specifically, referring to FIG. 1 , the inductor provided in this embodiment includes a magnetic core 20 and a coil 10. The magnetic core 20 is a symmetrical structure. The shape of the magnetic body includes a non-closed symmetrical shape and a closed symmetrical ring. The non-closed symmetrical shape includes a cylindrical shape, a "匚" shape, etc. The closed symmetrical ring includes a circular ring, an elliptical ring, a polygonal ring, etc. The polygonal ring includes a rectangular ring, a pentagonal ring, etc. This embodiment takes the circular ring-shaped magnetic core 20 as an example.

The magnetic core body 20 may be made of a magnetic conductive material, or directly made of a magnetic material, such as a ferromagnetic core, a nickel-zinc ferromagnetic core, a manganese-zinc core, and the like.

The wire is wound around the magnetic core 20 for one turn to form a single coil 10, and the wire forms multiple coils 10 and is wound around the magnetic core 20. The multiple coils 10 that are continuously wound around the magnetic core 20 form a winding, and the coils 10 on the magnetic core 20 include at least one winding. The winding includes multiple winding segments 11, and the number of turns of the winding segment 11 is the number of coils 10 in the winding segment 11, and the number of turns of a single winding segment 11 is more than 2 turns. The number of turns of any two winding segments 11 can be the same or different, and this application does not limit this.

The number of turns of the winding segment 11 per unit length in the circumferential direction of the magnetic core 20 is the coil 10 density of the winding segment 11 . The coil 10 densities of any two winding segments 11 may be the same or different, and the present application does not impose any limitation on this.

The winding directions of the conductors of the multiple winding segments 11 on a single magnetic core 20 are the same, that is, the conductors of the multiple winding segments 11 are all wound around the magnetic core 20 from the inside to the outside; or, the conductors of the multiple winding segments 11 are all wound around the magnetic core 20 from the outside to the inside, so that the multiple winding segments 11 generate magnetic fields in the same direction to form a conjugate inductor.

The magnetic core 20 includes two winding areas, which are respectively located on two symmetrical sides of the magnetic core 20, and a plurality of winding segments 11 are distributed in the two winding areas of the magnetic core 20, and at least one winding segment 11 is wound around a single winding area. The two winding areas of the magnetic core 20 can be symmetrically arranged on both sides of the symmetry axis of the magnetic core 20, or can be asymmetrically arranged on both sides of the symmetry axis of the magnetic core 20, and this application does not limit this.

The number of winding segments 11 wound on one winding area is greater than the number of winding segments 11 wound on the other winding area, so that there are unequal numbers of winding segments 11 in the two winding areas of the magnetic core 20, and the winding segments 11 in one winding area and the winding segments 11 in the other winding area are asymmetrically distributed.

The winding structure in which the winding segments 11 in one winding area and the winding segments 11 in another winding area are asymmetrically distributed is used, which is conducive to constructing multiple parasitic capacitors, so that the resonance point changes from a single frequency to multiple resonance frequencies, improves the phase of the impedance, and increases the capacitive reactance. Without eliminating the parasitic capacitor, multiple parasitic capacitors are actively constructed to balance the multiple resonance points of the high-frequency resonance, avoid the existence of common-mode interference, and help solve the influence of the parasitic capacitance generated by the PFC inductor on the high-frequency band.

In a possible implementation manner, any winding segment 11 is entirely located in one of the winding areas, so as to avoid a single winding segment 11 partially existing in one winding area and another partially existing in another winding area.

2 , the two sides of the symmetry axis of the magnetic core 20 are respectively a winding area and another winding area, the inductor includes a first winding segment 111, a second winding segment 112 and a third winding segment 113, the first winding segment 111 is entirely located in one winding area, the second winding segment 112 and the third winding segment 113 are entirely located in another winding area, so that the number of winding segments 11 in one winding area is less than the number of winding segments 11 in the other winding area.

In a possible implementation manner, the extension lengths of the plurality of winding segments 11 in the circumferential direction of the magnetic core 20 are all the same, and the total number of the winding segments 11 is an even number, and the plurality of winding segments 11 are asymmetrically distributed on both sides of any symmetry axis of the magnetic core 20. This avoids the situation where, when the magnetic core 20 has multiple symmetry axes, the number of winding segments 11 on one side is the same as the number of winding segments 11 on the other side on both sides of one of the symmetry axes, and the winding structure in which the number of winding segments 11 in the two winding areas is not equal can be satisfied.

As shown in FIG4 , the inductor includes a first winding segment 111, a second winding segment 112, a third winding segment 113 and a fourth winding segment 114. The first winding segment 111 to the fourth winding segment 114 have the same extension length in the circumferential direction of the magnetic core 20, and the inductor includes a total of four winding segments 11, and the total number of winding segments 11 is an even number. With one winding area and another winding area being respectively provided on both sides of the symmetry axis of the magnetic core 20, the first winding segment 111 is entirely located in one winding area, and the second winding segment 112, the third winding segment 113 and the fourth winding segment 114 are all entirely located in another winding area, so that the number of winding segments 11 in one winding area is less than the number of winding segments 11 in another winding area, and the first winding segment 111 to the fourth winding segment 114 are asymmetrically distributed on the magnetic core 20.

In a possible implementation, the conductor of at least some of the two adjacent winding segments 11 is one conductor, and the conductor includes a connecting segment 12 located between the two adjacent winding segments 11, and the connecting segment 12 extends along the circumferential direction of the magnetic core body 20, and the connecting segment 12 of the conductor does not wrap around the magnetic core body 20, so that the two adjacent winding segments 11 have a spacing distance in the circumferential direction of the magnetic core body 20.

The connecting segment 12 serves as a separation area between two adjacent winding segments 11, so that one wire can be wound to form multiple adjacent winding segments 11. The wire may include multiple connecting segments 12, and in the circumferential direction of the magnetic core 20, the lengths of the multiple connecting segments 12 may be the same or different, and the present application does not impose any limitation on this.

1 , the inductor includes a first winding segment 111, a second winding segment 112, and a third winding segment 113 that are adjacent to each other in sequence. The wire of the first winding segment 111, the wire of the second winding segment 112, and the wire of the third winding segment 113 are the same wire. A first connecting segment 121 is provided between the first winding segment 111 and the second winding segment 112, and a second connecting segment 122 is provided between the second winding segment 112 and the third winding segment 113. Both the first connecting segment 121 and the second connecting segment 122 extend along the circumferential direction of the magnetic core 20, and the wire is not wound around the magnetic core 20 at the first connecting segment 121 and the second connecting segment 122.

One end of the first winding segment 111 facing away from the second winding segment 112 has a first pin 131 , and one end of the third winding segment 113 facing away from the second winding segment 112 has a second pin 132 . Both pins 13 are used to be electrically connected to the circuit board.

In a possible implementation manner, in at least some of two adjacent winding segments 11 , both winding segments 11 include a single winding layer.

1 , the inductor includes a first winding segment 111 , a second winding segment 112 and a third winding segment 113 that are adjacent to each other in sequence. The first winding segment 111 to the third winding segment 113 each include a single winding layer to form a single-layer winding structure.

In a possible implementation manner, in at least some of two adjacent winding segments 11 , the winding layer of one winding segment 11 is a single layer, and the winding layer of the other winding segment 11 is a multi-layer.

2 , the inductor includes a first winding segment 111, a second winding segment 112, and a third winding segment 113 that are adjacent to each other in sequence. The first winding segment 111 includes a single winding layer to form a single-layer winding structure, and the second winding segment 112 and the third winding segment 113 each include multiple winding layers to form a multi-layer winding structure.

In a possible implementation manner, in at least some of two adjacent winding segments 11 , both winding segments 11 include a plurality of winding layers, and the number of winding layers of the two winding segments 11 may be the same or different.

3 , the inductor includes a first winding segment 111, a second winding segment 112, and a third winding segment 113 that are adjacent to each other in sequence. The first winding segment 111 to the third winding segment 113 each include a plurality of winding layers to form a multi-layer winding structure, and the number of winding layers of the first winding segment 111, the number of winding layers of the second winding segment 112, and the number of winding layers of the third winding segment 113 are the same.

The number of winding layers of the winding segment 11 only affects the magnetic flux of the winding segment 11, and has almost no effect on the parasitic capacitance constructed by the winding segment 11. On the premise of maintaining an unequal number of winding segments 11 in the two winding areas of the magnetic core body 20, a suitable number of winding layers can be set for the winding segment 11 according to actual needs.

In a possible implementation manner, the winding segment 11 includes a plurality of winding layers. In the circumferential direction of the magnetic core 20 , the lengths of two adjacent winding layers belonging to the same winding segment 11 may be the same or different.

As shown in FIG3 , the inductor includes a second winding segment 112 and a third winding segment 113. The second winding segment 112 and the third winding segment 113 each include a plurality of winding layers. In the circumferential direction of the magnetic core 20, the lengths of the plurality of winding layers of the second winding segment 112 are the same, the length of the outermost winding layer of the third winding segment 113 is less than the lengths of the plurality of winding layers on the inner side, and the lengths of the plurality of winding layers of the third winding segment 113 close to the inner side are the same.

In the circumferential direction of the magnetic core body 20, the extension length of the winding segment 11 only affects the magnetic flux of the winding segment 11, and has almost no effect on the parasitic capacitance constructed by the winding segment 11. On the premise of maintaining an unequal number of winding segments 11 in the two winding areas of the magnetic core body 20, a suitable extension length of the winding segment 11 can be set according to actual needs.

In a possible implementation, please refer to Figure 3, the inductor includes a first winding segment 111, a second winding segment 112 and a third winding segment 113 that are adjacent to each other in sequence, with one winding area and another winding area being located on both sides of the symmetry axis of the magnetic core 20, the first winding segment 11 being located as a whole in one winding area, and the second winding segment 112 and the third winding segment 113 being located as a whole in another winding area.

In the circumferential direction of the magnetic core 20 , the extension length of the second winding segment 112 and the extension length of the third winding segment 113 are both smaller than the extension length of the first winding segment 111 , and the total length of the extension length of the second winding segment 112 and the extension length of the third winding segment 113 is smaller than or equal to the extension length of the first winding segment 111 .

The first winding segment 111 is located as a whole on one side of the symmetry axis of the magnetic core body 20, the second winding segment 112 and the third winding segment 113 are located as a whole on the other side of the symmetry axis of the magnetic core body 20, the distribution area of the two winding areas on the magnetic core body 20 is more uniform, and the distribution of multiple winding segments 11 on the magnetic core body 20 is more uniform, which is conducive to simplifying the winding process of multiple winding segments 11, and an automated device can be used to wind the wires.

The first winding section 111 is located alone in a winding area, and the resonant frequency and high-frequency impedance of the entire inductor can be adjusted by adjusting the number of turns (turns) of the first winding section 111 .

In a possible implementation manner, referring to FIG. 3 , in the circumferential direction of the magnetic core 20 , the extension length of the second winding segment 112 is equal to the extension length of the third winding segment 113 .

The second winding segment 112 and the third winding segment 113 are evenly distributed in a single winding area, simplifying the winding process of multiple winding segments 11 in a single winding area.

In a possible implementation manner, referring to FIG. 3 , the wire of the first winding segment 111 , the wire of the second winding segment 112 , and the wire of the third winding segment 113 are one wire.

The first winding segment 111 has a first pin 131 at one end facing away from the second winding segment 112 , and the third winding segment 113 has a second pin 132 at one end facing away from the second winding segment 112 . The first pin 131 and the second pin 132 are respectively located on both sides of the symmetry axis of the magnetic core 20 .

The first winding segment 111, the second winding segment 112 and the third winding segment 113 are electrically connected to the circuit board through the first pin 131 and the second pin 132. The first pin 131 and the first winding segment 111 are located in the same winding area, the second pin 132 and the second winding segment 112, the third winding segment 113 are located in the same winding area, and there is a spacing distance between the first pin 131 and the second pin 132.

In a possible implementation, referring to FIG. 3 , the number of winding layers of the first winding segment 111 , the number of winding layers of the second winding segment 112 , and the number of winding layers of the third winding segment 113 are the same, and all are three layers.

In a possible implementation manner, referring to FIG. 1 , the magnetic core body 20 is in the shape of a circular ring, and a plurality of winding segments 11 are distributed at intervals on the circular ring.

Alternatively, the magnetic core body 20 is shaped as a rectangular ring, which includes four sides, and the four sides are arranged opposite to each other in pairs. Multiple winding segments 11 are distributed on one pair of opposite sides of the rectangular ring, and no winding segments 11 are arranged on the other pair of opposite sides. The two winding areas on the magnetic core body 20 can be arranged at intervals.

The present application also provides a specific embodiment of an electronic device, see Figure 3, the electronic device includes a circuit board and an inductor as described in any of the above embodiments, the inductor and the circuit board are electrically connected. Specifically, the coil 10 of the inductor includes a pin 13, the pin 13 is electrically connected to the circuit board, so that the inductor is energized to generate a magnetic field.

It can be understood that the electronic device in this embodiment has the inductor in the above embodiment. Therefore, the electronic device in this embodiment has all the technical effects of the inductor in the above embodiment. Since the technical effects of the inductor have been fully explained in the above embodiment, they will not be repeated here.

The technical solution of the utility model is described in detail below through specific embodiments.

Example 1

This embodiment provides an inductor, which includes two winding areas, which are respectively located on two symmetrical sides of the magnetic core 20 of the inductor, and the number of winding segments 11 wound on one winding area is 1, and the number of winding segments 11 wound on the other winding area is 2.

Comparative Example 1

The inductor provided in this comparative example is different from the inductor provided in Example 1 in that the number of winding segments 11 wound on one winding area is 2, and the number of winding segments 11 wound on the other winding area is 2.

To illustrate the technical effect of the above implementation, the following tests were conducted:

(1) The wire is wound around the magnetic core 20 in different winding ways to obtain the inductor in Example 1 and the inductor in Comparative Example 1 respectively.

(2) The inductor in Example 1 and the inductor in Comparative Example 1 are connected to a detection instrument respectively, and the common-mode noise and differential-mode noise measured waveforms of the inductor in Example 1 and the inductor in Comparative Example 1 are obtained respectively.

The results after the test are shown in Figures 5 and 6. From the test results of the inductor in Example 1 and the inductor in Comparative Example 1, it can be seen that when the Hertz frequency is 15M, the first waveform A and the second waveform B of the inductor in Example 1 are both at the peak value, and the quasi-peak value of the inductor in Example 1 and the first waveform A have a first spacing distance, and the average value of the inductor in Example 1 and the second waveform B have a second spacing distance; when the Hertz frequency is 25M, the third waveform C and the fourth waveform D of the inductor in Comparative Example 1 are both at the peak value, and the quasi-peak value of the inductor in Comparative Example 1 and the third waveform C have a third spacing distance, and the average value of the inductor in Comparative Example 1 and the fourth waveform D have a fourth spacing distance; the first spacing distance is greater than the third spacing distance, and the second spacing distance is greater than the fourth spacing distance, that is, the inductor in Example 1 has a better filtering effect.

The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims (10)

1. The inductor is characterized by comprising a magnetic core body and a coil, wherein the magnetic core body is of a symmetrical structure, and the coil is wound on the magnetic core body;

The coil comprises a winding, the winding comprises a plurality of winding sections, the winding sections are distributed in two winding areas of the magnetic core body, the two winding areas are respectively located on two symmetrical sides of the magnetic core body, and the number of winding sections wound on one winding area is larger than that of winding sections wound on the other winding area.

2. An inductor according to claim 1, wherein any one of said winding segments is integrally located within one of said winding regions.

3. An inductor according to claim 1 or 2, characterized in that the wires of two adjacent winding segments are one wire, said wires comprising a connection segment between two adjacent winding segments, said connection segment extending in the circumferential direction of the core body.

4. The inductor of claim 1 or 2, wherein the winding segments comprise a first winding segment, a second winding segment and a third winding segment that are sequentially adjacent, the wires of the first winding segment, the wires of the second winding segment and the wires of the third winding segment being one wire, the first winding segment being located in one of the winding regions, the second winding segment and the third winding segment being located in the other of the winding regions.

5. The inductor as claimed in claim 4, wherein an extension length of the second winding segment is equal to an extension length of the third winding segment in a circumferential direction of the magnetic core body.

6. The inductor of claim 4, wherein the first winding segment, the second winding segment, and the third winding segment each comprise a plurality of winding layers to form a multi-layer surrounding structure, the number of layers of the winding layers of the first winding segment, the second winding segment, and the third winding segment being the same.

7. The inductor of claim 4, wherein an end of the first winding segment facing away from the second winding segment has a first pin and an end of the third winding segment facing away from the second winding segment has a second pin.

8. The inductor of claim 7, wherein the first pin and the second pin are located on opposite sides of an axis of symmetry of the core body.

9. The inductor of any one of claims 1,2, 5 to 8, wherein the magnetic core body is in the shape of a circular ring on which a plurality of the winding segments are spaced apart; or the magnetic core body is in a rectangular ring shape, and a plurality of winding sections are distributed on two opposite sides of one pair of rectangular rings.

10. An electronic device comprising a circuit board and the inductor of any one of claims 1 to 9, the inductor being electrically connected to the circuit board.