JP2008277566A - Ring-shaped winding type inductor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an epoch-making practical ring-shaped winding type inductor which can achieve a high attenuation characteristic in a wide frequency band by only one ring-shaped winding type inductor. <P>SOLUTION: The ring-shaped winding type inductor is formed by winding a conductive wire 2 around an external circumferential portion of a troidal core 1. The cross section of the external circumferential portion of the troidal core 1 is set to a shape which is not constant but is partially deformed so that the winding diameter of the conductive wire 2 continuously wound around the external circumferential portion of the troidal core 1 is not constant but varies depending on the winding positions. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a ring-shaped wound inductor mounted on, for example, circuit wiring of a printed wiring board.

  Various ring-shaped wound inductors, called so-called toroidal coils (ring coils), which are formed by continuously winding a conductive wire around the outer periphery of a ring-shaped toroidal core having ferromagnetism have been proposed (for example, Patent Documents 1 and 2).

  This ring-shaped wound inductor has the advantage that most of the magnetic flux passes through the ring-shaped toroidal core itself, and has the advantage that it has less leakage magnetic flux and is not easily affected by surrounding objects, and can exhibit stable inductance. Therefore, it is particularly preferred for high frequency circuits.

  By the way, since this conventional ring-shaped wound inductor (hereinafter referred to as a conventional product) has a constant cross-sectional shape at the outer periphery of the toroidal core that continuously winds the conducting wire, The winding diameter of the conducting wire that is continuously wound is also a constant diameter.

  Therefore, the conventional product has only a single resonance frequency because the winding diameter of the conductive wire is always constant. Therefore, the impedance increases well in the resonance frequency band, and the high attenuation characteristic (inductor). However, when the frequency is out of the resonance frequency band, the impedance immediately decreases, and the attenuation characteristic attenuates accordingly. In other words, it is effective only in a narrow frequency band (high attenuation characteristics cannot be obtained). When high attenuation characteristics are required in a wide frequency band, a plurality of conventional products having different resonance frequencies are mounted in one circuit. There are various problems such as high cost and high mounting space and large bulky circuit device itself.

JP 2002-217046 A JP 2005-142316 A

  The present invention has further advanced research and development on this type of ring-shaped wound inductor that has been proposed in the past, and a structure having a plurality of resonance frequencies can be realized with a simple structure using an integral ring-shaped wound inductor. Thus, it is an object of the present invention to provide an epoch-making ring-shaped winding inductor excellent in practicality that can realize high attenuation characteristics in a wide frequency band by using only a single ring-shaped winding inductor.

  The gist of the present invention will be described with reference to the accompanying drawings.

  A ring-shaped wound inductor formed by winding a conducting wire 2 around the outer periphery of the toroidal core 1, wherein the winding diameter of the conducting wire 2 continuously wound around the outer periphery of the toroidal core 1 is not constant. The present invention relates to a ring-shaped wound inductor in which the cross-sectional shape of the outer peripheral portion of the toroidal core 1 is set to a shape that is not constant but varies depending on the location so that the winding diameter varies depending on the wire location.

  Further, the toroidal core 1 is formed such that the winding diameter of the conducting wire 2 continuously wound around the outer peripheral surface of the toroidal core 1 is not constant but gradually increases or decreases gradually along the circumferential direction of the toroidal core 1. The cross-sectional shape of the outer peripheral surface of the outer peripheral surface is not constant but is set to a shape in which the area (cross-sectional area) of the cross-sectional shape of the outer peripheral surface gradually increases or decreases gradually along the circumferential direction of the toroidal core 1. The present invention relates to the ring-shaped wound inductor described.

  The toroidal core 1 has a ring shape having a ring hole 3 in the center, and the toroidal core 1 has a shape in which the wall thickness is not constant in a side view, or the toroidal core 1 in a plan view. By making the distance from the inner surface portion of the ring hole 3 to the outer peripheral surface portion of the toroidal core 1 variable, the cross-sectional shape of the outer peripheral portion around which the conducting wire 2 of the toroidal core 1 is wound is constant. The ring-shaped wound inductor according to any one of claims 1 and 2, wherein the shape is changed according to the location.

  4. The toroidal core 1 is set to have a shape in which the wall thickness gradually increases from a position where the wall thickness is minimized to a position where the wall thickness is maximized in a side view. This relates to the ring-shaped wound inductor.

  Further, the toroidal core 1 has a ring shape having a ring hole 3 in the center, and an eccentric ring shape in which the hole center position of the ring hole 3 is not shifted from the overlapping position with respect to the center position of the toroidal core 1. 5. The shape of the toroidal core 1 is set, and the cross-sectional shape of the outer periphery around which the conducting wire 2 of the toroidal core 1 is wound is set to a shape that is not constant but changes depending on the location. The ring-shaped wound inductor according to any one of the above.

  The toroidal core 1 has an area ratio of 1. where the area (cross-sectional area) of the cross-sectional shape of the outer peripheral portion is maximum with respect to the location where the cross-sectional area (cross-sectional area) of the outer peripheral portion is minimum. The ring-shaped wound inductor according to any one of claims 1 to 5, wherein the shape is set to be 1 to 500 times.

  The toroidal core 1 has an area ratio of 1. where the area (cross-sectional area) of the cross-sectional shape of the outer peripheral portion is maximum with respect to the location where the cross-sectional area (cross-sectional area) of the outer peripheral portion is minimum. The ring-shaped wound inductor according to claim 6, wherein the shape is set to be 5 to 500 times.

  The toroidal core 1 has a circular outer shape or a polygonal shape of at least a pentagon, and the outer peripheral surface portion and the inner surface portion of the ring hole 3 of the toroidal core 1 have a cross-sectional shape of the outer peripheral portion of the toroidal core 1. A shape in which the area (cross-sectional area) of the cross-sectional shape of the outer peripheral portion gradually increases without increasing or decreasing suddenly along the circumferential direction of the toroidal core 1 from the position where the area (cross-sectional area) is minimized to the position where the area is maximum. The ring-shaped wound inductor according to any one of claims 1 to 7, wherein

  Since the present invention is configured as described above, the winding diameter of the conductive wire continuously wound around the outer peripheral portion of the toroidal core varies depending on the winding location, and as a result, the product of the present invention integrally has a plurality of different resonance frequencies. The plurality of different resonance frequencies can exhibit excellent (high) attenuation characteristics in a wide frequency band.

  In addition, the outer periphery of the toroidal core has a shape that changes depending on the location. By simply winding a conductor around this outer periphery, the winding diameter of the conductor is not constant and the above-mentioned excellent attenuation characteristics The structure with the can be easily realized, and excellent in mass productivity and cost.

  Therefore, in order to achieve a high attenuation characteristic in a wide frequency band using a conventional product having only a single resonance frequency, it is necessary to mount a plurality of types of conventional products having different resonance frequencies in one electronic circuit. However, according to the present invention, a high attenuation characteristic in a wide frequency band can be obtained as a single unit, and a high attenuation characteristic in a wide frequency band can be realized with such a small number of parts, so that the mounting cost is reduced and the mounting space is also reduced. It is possible to easily reduce the size of the circuit device that is reduced. Furthermore, the product of the present invention itself has a simple structure, and has a structure that is excellent in mass productivity and cost performance that can be manufactured at substantially the same cost as the conventional product. Therefore, the present invention is excellent in practicality and mass productivity. This is an extremely innovative and highly productive ring winding inductor.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention that are considered suitable (how to carry out the invention) will be briefly described with reference to the drawings, illustrating the operation of the present invention.

  The present invention relates to a ring-shaped wound inductor formed by winding a conducting wire 2 around an outer periphery of a toroidal core 1.

  In the toroidal core 1 of the present invention, the cross-sectional shape of the outer peripheral portion around which the conducting wire 2 is continuously wound is set to a shape that is not constant but varies depending on the location. Therefore, the winding diameter of the conducting wire 2 continuously wound around the outer periphery of the toroidal core 1 is not constant, and the winding diameter varies depending on the winding location.

  That is, in the conventional product, the winding diameter of the conductor 2 is constant, and therefore has only a single resonance frequency. In the present invention, the winding diameter of the conductor 2 differs depending on the winding location. For this reason, a plurality of resonance frequencies can be held integrally, and a high attenuation characteristic can be obtained in such a wide frequency band.

  In addition, since the conductor 2 is simply wound around the toroidal core 1 whose cross-sectional shape of the outer peripheral portion is not constant but is changed depending on the location, the winding diameter of the conductor 2 is small. An excellent structure having a plurality of resonance frequencies can be easily realized depending on the winding location.

  Therefore, in the past, in order to obtain a high attenuation characteristic in a wide frequency band, a plurality of types of conventional products having only a single resonance frequency had to be mounted. The ring-shaped wound inductor can provide excellent attenuation characteristics in a wide frequency band, so the number of mountings can be reduced, the cost can be reduced, the mounting space can be reduced, and the circuit device can be easily downsized. Such a structure having excellent damping characteristics can be realized with a simple configuration, and it is excellent in mass productivity and cost.

  For example, the toroidal core 1 is wound so that the winding diameter of the conducting wire 2 continuously wound around the outer peripheral surface of the toroidal core 1 is not constant but gradually increases or decreases gradually along the circumferential direction of the toroidal core 1. If the cross-sectional shape of the outer peripheral surface of the toroidal core 1 is not constant, but the area of the cross-sectional shape of the outer peripheral surface, that is, the cross-sectional area gradually increases or decreases along the circumferential direction of the toroidal core 1, Since the cross-sectional shape of the portion gradually increases or decreases gradually without increasing or decreasing rapidly, the operation of winding the conducting wire 2 around the toroidal core 1 can be performed as usual without any particular difficulty.

  Moreover, since the winding diameter of the conducting wire 2 gradually increases or decreases gradually, it has a plurality of continuously different resonance frequencies, so that it has a structure that can continuously exhibit high attenuation characteristics in a predetermined wide frequency band. For example, it is also possible to easily realize setting so that a high attenuation characteristic higher than a specific value can be obtained over the entire area of a specific wide frequency band.

  Moreover, the cross-sectional shape of the outer peripheral part of the toroidal core 1 is, for example, a shape in which the thickness of the toroidal core 1 is not constant in a side view (see FIG. 3), or for example, the toroidal core 1 in a plan view The cross section of the outer peripheral portion of the toroidal core 1 is formed by changing the distance from the inner surface portion of the ring hole 3 in the central portion to the outer peripheral surface portion of the toroidal core 1 instead of being constant (see FIGS. 1 and 2). It is possible to easily design a shape whose shape changes depending on the location.

  In particular, as shown in FIG. 1, when the shape of the toroidal core 1 is set to an eccentric ring shape in which the center position of the ring hole 3 is not a superposition position with respect to the center position of the toroidal core 1, By adjusting and designing the eccentric position deviation amount of the hole center position of the ring hole 3, the amount of change in the area (cross-sectional area) of the cross-sectional shape of the outer peripheral portion of the toroidal core 1 can be easily adjusted and designed. If the wall thickness of the toroidal core 1 is constant as in the example, the surface area, volume, and weight of the toroidal core 1 can be adjusted by adjusting the amount of eccentric position deviation of the center position of the ring hole 3 with respect to the center position of the toroidal core 1. It is also possible to adjust and design the amount of change in the area (cross-sectional area) of the cross-sectional shape of the outer peripheral portion of the toroidal core 1 while keeping it constant without changing.

  Specific embodiments of the present invention will be described with reference to the drawings.

  This embodiment is a ring-shaped wound inductor formed by winding a conductor 2 around the outer periphery of a toroidal core 1, and the winding diameter of the conductor 2 continuously wound around the outer periphery of the toroidal core 1. The cross-sectional shape of the outer peripheral portion of the toroidal core 1 is set to a shape that is not constant but varies depending on the location so that the winding diameter varies depending on the location of the winding.

  Hereinafter, the present embodiment will be specifically described.

  The toroidal core 1 is made of a ferromagnetic material, and the winding diameter of the conducting wire 2 continuously wound around the outer peripheral surface of the toroidal core 1 is not constant, but the circumferential direction of the toroidal core 1 The cross-sectional shape of the outer peripheral surface of the toroidal core 1 is not constant, and the area (cross-sectional area) of the outer peripheral surface of the toroidal core 1 is gradually increased along the circumferential direction. The shape is set to gradually increase or decrease.

  In addition, the description “cross-sectional shape” of the outer peripheral surface of the toroidal core 1 is a cut when a predetermined portion of the outer peripheral surface of the toroidal core 1 is cut along the winding direction of the conductor 2 wound around the portion. It means the shape of the surface. In addition, the description “circumferential direction” of the toroidal core 1 means a circumferential direction in the plan view of the toroidal core 1. ).

  Therefore, since the shape of the outer peripheral portion of the toroidal core does not increase or decrease rapidly but gradually increases or decreases gradually, the operation of continuously winding the conducting wire 2 around the outer peripheral portion is performed as usual without any particular difficulty. be able to. In addition, since the winding diameter of the conductor 2 wound around the outer peripheral portion gradually increases or decreases, the winding diameter gradually changes, so that the winding diameter gradually increases or decreases, so that it has a plurality of continuously different resonance frequencies. Therefore, it is also possible to easily realize a structure that provides excellent (high) attenuation characteristics in the entire region of a specific very wide frequency band.

  Specifically, as illustrated in FIG. 1, the disc body is formed in a ring shape having a circular ring hole 3 in a penetrating state at the center. That is, the outer peripheral surface portion is circular in plan view, and the inner surface portion of the ring hole 3 is also formed in a circular ring shape. Furthermore, the center position of the ring hole 3 is set to a position shifted from the center position of the toroidal core 1 in the shape of an annular ring, and the shape of the toroidal core 1 is set in an eccentric ring shape. is doing.

  Therefore, the toroidal core 1 has a shape in which the distance from the inner surface portion of the ring hole 3 to the outer peripheral surface portion of the toroidal core 1 is not constant in plan view due to the eccentric position shift of the critical hole center position of the ring hole 3. Thus, the cross-sectional shape of the outer peripheral portion of the toroidal core 1 is not constant, and the area (cross-sectional area) of the cross-sectional shape is set to gradually increase and decrease gradually along the circumferential direction.

  In this embodiment, the wall thickness (plate thickness) of the toroidal core 1 in a side view is set to be constant.

  Here, the shape of a general toroidal core is a ring shape in which a circular through hole is formed at the center position of the central portion of a disc body having a constant thickness (plate thickness) in a side view. On the other hand, the shape of the toroidal core 1 of this embodiment is such that a circular ring hole 3 is formed at the center of a disc body having a constant thickness in side view, but the center position of the ring hole 3 is the toroidal core 1. It is an eccentric ring shape shifted from the center position of the center. That is, the eccentric position deviation amount of the hole center position of the ring hole 3 with respect to the center position of the toroidal core 1 is zero in the conventional general toroidal core 1 shape. The shape of the toroidal core 1 of this embodiment is provided with a predetermined amount of eccentric position deviation.

  Therefore, by adjusting and setting the amount of eccentric position deviation of the center position of the ring hole 3 at the center of the toroidal core 1, the amount of change in the area of the cross-sectional shape of the outer peripheral portion of the toroidal core 1 and the adjustment setting of the rate of change can be adjusted. Easy to plan. In other words, the amount of change and rate of change in the cross-sectional shape of the outer periphery of the toroidal core 1 that determines the winding diameter of the conducting wire 2 and hence the resonance frequency are simply designed by adjusting the eccentric position deviation of the center position of the ring hole 3 at the time of design. Thus, the adjustment design can be easily performed, and thus the shape of the toroidal core 1 having the desired change amount and change rate can be easily designed and realized. In addition, the surface area, volume, and mass of the toroidal core 1 do not change regardless of the amount of eccentric position deviation of the ring hole 3, so this is not necessary when adjusting the amount of change or rate of change in the cross-sectional area of the outer periphery of the toroidal core 1. Changes in the surface area, volume, and mass of the toroidal core 1 need not be considered at all. In this respect, handling is easy and practicality is high.

  In addition, this toroidal core 1 has an area ratio of 1. where the area (cross-sectional area) of the cross-sectional shape of the outer peripheral portion is maximum with respect to the location where the cross-sectional area (cross-sectional area) of the outer peripheral portion is minimum. The shape is set to 1 to 500 times, preferably 1.5 to 500 times. Thereby, the winding diameter of the conducting wire 2 continuously wound around the outer peripheral portion of the toroidal core 1 is surely changed, and as a result, it has a plurality of different resonance frequencies and exhibits high attenuation characteristics in a wide frequency band. The excellent characteristics of the present embodiment can be surely exhibited.

  As shown in FIG. 1, the toroidal core 1 of the present embodiment is configured such that the outer peripheral surface portion and the inner surface portion of the ring hole 3 are set in a circular shape or at least a pentagonal polygon shape. The area of the cross-sectional shape of the outer peripheral portion, that is, from the point where the cross-sectional area is minimum to the point where the cross-sectional area is maximum, the cross-sectional area does not increase or decrease along the circumferential direction of the toroidal core 1 gradually (continuously and gently). B) The shape is set to gradually increase. That is, for example, when the outer peripheral surface portion of the toroidal core 1 is a triangle or a rectangle and the ring hole 3 is formed in the center in a triangle or a rectangle, the toroidal core 1 is maximized from the point where the cross-sectional area is minimized. The winding diameter of the conductive wire 2 continuously wound in the range up to the point where it becomes becomes a shape that repeats increasing and decreasing, and the frequency range of the resonance frequency of each continuous winding 2 is also increased or decreased Will do. In this respect, in the present embodiment, the outer peripheral surface portion of the toroidal core 1 is formed in a circular shape, and the ring hole 3 is also formed in a circular shape, so that the cross-sectional area reaches the maximum position from the minimum. The winding diameter of the conducting wire 2 continuously wound in the range does not increase or decrease rapidly along the circumferential direction of the toroidal core 1 but gradually increases. Therefore, the resonance frequency of each of the continuously wound conductive wires 2 is not continuously increased or decreased, and the frequency range is continuously changed. A collection of a plurality of resonance frequencies whose frequency range changes can exhibit very excellent attenuation characteristics in a wide frequency band. Moreover, when the area of the cross-sectional shape of the outer peripheral portion does not increase / decrease abruptly and becomes a shape that increases gradually (slowly), the work of winding the conductor 2 around the outer peripheral portion can be easily performed and the productivity can be improved. Excel. Moreover, the shape of the outer peripheral surface portion of the toroidal core 1 and the inner surface portion of the ring hole 3 is not circular as in the present embodiment, for example, the shape of the outer peripheral surface portion and the inner surface portion of the ring hole 3 is a polygonal shape of pentagon or more. It is also possible to set it to a shape that can prevent the winding diameter of the conducting wire 2 wound around the outer periphery from abruptly increasing and decreasing (in this case, by making it more polygonal, the winding diameter It can be set to a shape that can more effectively prevent sudden increase and decrease of.

  In the present embodiment, the shape of the toroidal core 1 is set as described above. However, the shape of the toroidal core 1 is not limited to this. For example, as in another example shown in FIG. The center position of the ring hole 3 in the central portion is set to the overlapping position. However, the shape of the ring hole 3 is not a circle but an elliptical shape or a star shape, for example, so that the toroidal shape can be seen in plan view. The distance from the inner surface portion of the ring hole 3 of the core 1 to the outer peripheral surface portion of the toroidal core 1 may be set to a shape that is not constant but changed. Further, for example, as shown in FIG. 3 and FIG. 4, the center position of the ring hole 3 in the central portion is set to the overlapping position with respect to the center position of the toroidal core 1. May be set to a shape in which the thickness (plate thickness) is not constant in a side view. In another example 2 shown in FIGS. 3 and 4, the thickness of the toroidal core 1 gradually increases from a point where the wall thickness becomes minimum to a point where it becomes maximum (in particular, this wall thickness gradually increases). In another example 2 shown in the figure, the thickness gradually increases at a constant rate), and the winding diameter of the conducting wire 2 wound around the outer peripheral portion of the toroidal core 1 does not increase or decrease rapidly but changes continuously (see above). The thickness is set so that the thickness gradually increases from the smallest part to the largest part. At this time, for example, as in another example 3 shown in FIG. 5 and FIG. 6, if the thickness of the toroidal core 1 is changed and the center position of the ring hole 3 is set to be eccentric, The change amount and change rate of the cross-sectional area (cross-sectional area) of the outer peripheral portion of the toroidal core 1 can be further increased. In addition, as long as the cross-sectional shape of the outer peripheral portion of the toroidal core 1 is not constant but changes depending on the location, not only those described above but also various shapes can be adopted.

  In this embodiment, the conducting wire 2 is continuously wound around the outer periphery of the toroidal core 1 so as to pass through the ring hole 3 of the toroidal core 1. This winding method may employ either the normal mode or the common mode.

  In this embodiment, the conductor 2 is continuously wound around the entire circumference in the circumferential direction of the toroidal core 1. However, the conductor 2 is only partially provided on the circumferential half of the toroidal core 1, for example. It is good also as a structure wound.

  Here, a lead wire 2 having a diameter of 0.2 mm is wound 39 times on an eccentric ring-shaped toroidal core 1 in which the core center position and the center position of the ring hole 3 in the center portion are deviated from each other. FIG. 9 and FIG. 10 show the results of evaluating the attenuation characteristics with a network analyzer using a ring-shaped wound inductor (normal mode) as a product of this example. As a comparative product, the core diameter is 10 mm as in the present embodiment product, but the core center position and the hole center position of the ring hole 5 are not deviated from each other in an eccentric position. A normal ring-shaped wound inductor having a configuration in which a conductive wire 2 having a diameter of 0.2 mm is wound 39 times on a concentric ring-shaped toroidal core 6 (see FIGS. 7A and 8A) (normal) Mode).

  While a sweep signal is oscillated from a sweeper (sweep signal oscillator) to a receiver (receiver), an attenuation amount (attenuation characteristic) is evaluated by a network analyzer (high frequency measuring device). At this time, as shown in FIG. 7, the result when the evaluation test is performed by mounting the toroidal cores 1 and 6 vertically on the test circuit board on which the microstrip line 4 is wired is shown in FIG. FIG. 10 shows the results when an evaluation test is performed with the toroidal cores 1 and 6 mounted horizontally on the test circuit board on which the microstrip line 4 is wired as shown in FIG.

  As can be seen from FIG. 9, when the toroidal cores 1 and 6 are mounted vertically and an evaluation test is performed, the product of this example has excellent attenuation of −20 dB or more over a wide range from about 20 MHz to about 6000 MHz. While the characteristics can be exhibited, the comparative product can exhibit an attenuation of −20 dB or more from around 20 MHz, but the attenuation is weakened to approximately −18 dB in the range of 1000 to 2000 MHz.

  As can be seen from FIG. 10, when the toroidal cores 1 and 6 were mounted horizontally and an evaluation test was performed, the product of this example was excellent with an attenuation of −20 dB or more over a wide range from about 20 MHz to 8000 MHz. While the attenuation characteristic can be exhibited, the comparative product is attenuated to approximately −18 dB in the range of 1000 to 2000 MHz. Thus, the product of this example can exhibit excellent (high) attenuation characteristics over a wide range compared to the comparative product.

  As described above, according to the present embodiment, an excellent ring-shaped wound inductor that can obtain high attenuation characteristics over a very wide range can be reliably realized with a simple configuration, for example, an inductor mounted on a high-frequency circuit or the like. As a result, it is a ring-shaped wound inductor excellent in practicality and mass productivity.

  Note that the present invention is not limited to this embodiment, and the specific configuration of each component can be designed as appropriate.

It is a description perspective view of the ring-shaped winding type inductor concerning this example. It is explanatory perspective view which shows the other example 1 of a present Example. It is explanatory side sectional drawing which shows the other example 2 of a present Example. It is explanatory plan view showing another example 2 of the present embodiment. It is explanatory side sectional drawing which shows the other example 3 of a present Example. It is an explanatory top view which shows another example 3 of a present Example. It is explanatory drawing which shows the attenuation characteristic comparison test method of a present Example. It is explanatory drawing which shows the attenuation characteristic comparison test method of a present Example. It is explanatory drawing which shows the attenuation characteristic comparison test result of a present Example. It is explanatory drawing which shows the attenuation characteristic comparison test result of a present Example.

Explanation of symbols

1 Toroidal core 2 Conductor 3 Ring hole

Claims (8)

  A ring-shaped wound inductor formed by winding a conductive wire around the outer periphery of a toroidal core, and the winding diameter of the conductive wire continuously wound around the outer periphery of the toroidal core is not constant but varies depending on the winding location A ring-shaped wound inductor, wherein the cross-sectional shape of the outer peripheral portion of the toroidal core is set to a shape that is not constant but varies depending on the location so as to have a winding diameter.   The cross-sectional shape of the outer peripheral surface of the toroidal core so that the winding diameter of the conducting wire continuously wound around the outer peripheral surface of the toroidal core is not constant but gradually increases or decreases gradually along the circumferential direction of the toroidal core. 2. A ring-shaped wound inductor according to claim 1, wherein the area of the cross-sectional shape (cross-sectional area) of the outer peripheral surface gradually increases or decreases gradually along the circumferential direction of the toroidal core. .   The toroidal core has a ring shape with a ring hole in the center, and the toroidal core has a shape in which the wall thickness is not constant in a side view, or an inner surface portion of the ring hole of the toroidal core in a plan view By setting the distance from the outer peripheral surface portion of the toroidal core to a shape that is not constant and changed, the cross-sectional shape of the outer peripheral portion around which the conducting wire of the toroidal core is wound is set to a shape that is not constant and changes depending on the location. The ring-shaped wound inductor according to any one of claims 1 and 2.   The ring shape according to claim 3, wherein the toroidal core is set to have a shape in which the thickness gradually increases gradually from a position where the thickness is minimum to a position where the thickness is maximum in a side view. Wire wound inductor.   The toroidal core has a ring shape with a ring hole in the center, and the shape of the toroidal core is set to an eccentric ring shape in which the center position of the ring hole is not aligned with the center position of the toroidal core. The ring according to any one of claims 1 to 4, wherein a cross-sectional shape of an outer peripheral portion around which the conducting wire of the toroidal core is wound is set to a shape that is not constant but varies depending on a location. Wire wound inductor.   In the toroidal core, the area ratio of the area where the cross-sectional area (cross-sectional area) of the outer peripheral portion is maximum is 1.1 times to the position where the cross-sectional area (cross-sectional area) of the outer peripheral portion is minimum. The ring-shaped wound inductor according to any one of claims 1 to 5, wherein the ring-shaped wound inductor is set to a shape that is 500 times larger.   In the toroidal core, the area ratio of the area where the cross-sectional area (cross-sectional area) of the outer peripheral portion is maximum is 1.5 times to the position where the cross-sectional area (cross-sectional area) of the outer peripheral portion is minimum. 7. The ring-shaped wound inductor according to claim 6, wherein the ring-shaped wound inductor is set to a shape that is 500 times larger.   In the toroidal core, the outer peripheral surface portion and the inner surface portion of the ring hole of the toroidal core are set to be circular or at least a pentagonal polygonal shape, and the cross-sectional area (cross-sectional area) of the outer peripheral portion of the toroidal core is From the smallest part to the largest part, the area (cross-sectional area) of the cross-sectional shape of the outer peripheral part along the circumferential direction of this toroidal core is set to a shape that gradually increases without increasing or decreasing rapidly. The ring-shaped wound inductor according to any one of claims 1 to 7.

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