JP2000040626A - choke coil - Google Patents

Abstract

(57) [Problem] The present invention relates to a choke coil for preventing noise used in consumer or industrial electronic equipment, and comprises a normal mode choke coil and a common mode choke coil with one element. It is intended to do so. SOLUTION: A coil 12 is provided inside a magnetic core 10.
And the winding 13 is wound around the center hole 11 of the magnetic core 10.
And the magnetic flux 14 generated by the coil 12 and the magnetic flux 15 generated by the winding 13 are orthogonal to each other, and the normal mode choke coil and the common mode choke coil are formed by one element. It is possible to reduce the size of the element, reduce the number of parts, reduce the mounting area, and reduce the weight.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a choke coil for preventing noise used in consumer or industrial electronic equipment.

[0002]

2. Description of the Related Art A conventional technique will be described with reference to FIGS. First, according to the figure, a first hollow magnetic core having an inner cylinder and an outer cylinder, which is closed at one end side and combined with the other end side via a magnetic gap spacer 1 to provide a coil housing portion. A first mode coil 4 and a second mode coil 5 are wound around a core 2 and a second hollow core 3 to form a normal mode choke coil. A common mode choke coil formed by winding the first winding 6 and the second winding 7 so that directions of magnetic fluxes generated cancel each other in a normal mode and add each other in a common mode. It is.

Further, as another conventional technique, contrary to the above-described choke coil, the directions of magnetic fluxes generated by two coils wound in a hollow magnetic core cancel each other out in a normal mode. In the common mode, a common mode choke coil is formed by winding so that they are added to each other, and a normal mode choke coil is formed by a winding wound around the core surface through a hole in the core (actual open flat). 6-13120).

[0004]

However, in the above configuration, at least two sets of normal mode or common mode coils and windings are required, and the number of parts is large.
This causes a large size, an increase in weight, a complicated process, and an increase in cost. Further, since the shape of the magnetic core is complicated, selection of the magnetic core material is restricted, and the characteristics are limited. Therefore, it is necessary to enlarge the magnetic core or increase the number of turns of the coil in order to obtain necessary characteristics, and these factors cause an increase in size, weight, and cost.

An object of the present invention is to provide a choke coil having a small size and excellent characteristics.

[0006]

In order to solve the above-mentioned problems, a choke coil according to the present invention is provided with a center hole at the center of a closed magnetic circuit core containing a coil, and a center hole is formed on the peripheral surface of the closed magnetic circuit core by the coil. In this configuration, a winding is wound so as to generate a magnetic flux orthogonal to the magnetic flux generated.

[0007] With the above configuration, two choke coils can be formed even with one coil, one winding, and one closed magnetic circuit core, and the cost can be reduced by reducing the number of parts.
The number of man-hours in production can be reduced.

[0008]

DETAILED DESCRIPTION OF THE INVENTION According to the first aspect of the present invention, a center hole is provided at the center of a closed magnetic path core having a storage portion for housing a coil, and the peripheral surface of the closed magnetic path core is formed by the coil. The winding is wound so as to generate a magnetic flux orthogonal to the generated magnetic flux. Even with only one coil, one winding, and one magnetic core, two choke coils can be constructed with one element. Also, cost reduction and man-hour reduction can be achieved by reducing the number of parts, and downsizing can reduce the mounting area, material and loss.

According to a second aspect of the present invention, the outer shape of the closed magnetic path core is formed in a ring shape. In addition to the same effects as those of the first aspect, the closed magnetic path core passes through a circumferential magnetic path formed by windings. A large inductance value can be obtained even in a small magnetic core by eliminating a loss of magnetic flux and obtaining a large effective magnetic permeability, the element can be reduced in size and the cost can be reduced, and the leakage magnetic flux generated by the winding is reduced. Therefore, the influence on other components during circuit mounting can be reduced.

According to a third aspect of the present invention, the external shape of the closed magnetic path magnetic core is a square frame. In addition to the same effects as those of the first aspect, the winding wound on the magnetic core has a solenoid shape. The winding rate can be improved, the wire area ratio can be improved and the size can be reduced, and the winding process can be facilitated to reduce the cost.

According to a fourth aspect of the present invention, the cross section of the magnetic leg of the closed magnetic circuit core is square. In addition to the same effect as in the second or third aspect, when the cross section of the magnetic core is square, the magnetic core Compression molding from the top and bottom surfaces can be facilitated, and the effective cross-sectional area for the magnetic flux generated by the coil can be made substantially constant.

According to a fifth aspect of the present invention, the cross section of the magnetic leg of the closed magnetic circuit core is circular, and the use length of the winding is shortened by using a magnetic core having a circular cross section.
Since the amount of heat generated during energization is reduced, the product can be reduced in size by reducing the diameter of the copper wire to reduce weight, mounting area, materials used, and copper loss. Further, since the leakage magnetic flux of the magnetic flux generated by the coil is reduced, the influence on other components during circuit mounting can be reduced.

According to a sixth aspect of the present invention, there is provided a magnetic core with a core having a groove as a storage portion for housing a coil between a core having a central hole as a closed magnetic core and a peripheral wall, and a central hole in the center. Thus, in addition to the same effects as in claim 1, the coil can be easily and reliably housed in the magnetic core by the above-mentioned configuration, and furthermore, the magnetic flux can be generated in the magnetic path through which the magnetic flux flows. When the magnetic core cross-sectional area is constant, the inner cylinder of the magnetic core is made thicker, and the outer cylinder is made thinner so that the cross-sectional areas on the plane perpendicular to the central axis become equal. The thickness of one end and the magnetic core that closes off are set so that their cross-sectional areas at planes equidistant from the central axis are equal, and the dimensions are changed to change the cross-sectional area in the magnetic path, The characteristics of the choke coil may be changed.

According to a seventh aspect of the present invention, the core with the core and the plate-shaped core are made of materials having different magnetic properties. By changing the material, size, and shape of the magnetic core, characteristics such as an inductance value, frequency characteristics, and DC superimposed saturation characteristics can be adjusted to arbitrary characteristics.

According to an eighth aspect of the present invention, one of the core and the peripheral wall of the core with a core is made higher than the other one. Since a space gap is formed between the plate-shaped core and the core with the core or the lower side of the peripheral wall in the passing magnetic path, a gap for preventing magnetic saturation can be provided without using a component such as a gap spacer. In addition, the magnetic saturation characteristics can be improved.

According to a ninth aspect of the present invention, a magnetic core having a core having a groove as a storage portion for storing a coil is provided between a core having a center hole as a closed magnetic core and a peripheral wall, and the groove is magnetic. It is used as a gap, and since a space gap is formed between the upper surface of the inner cylinder and the upper surface of the outer cylinder of the magnetic core in the magnetic path through which the magnetic flux passes, the gap can be provided without using components such as gap spacers. In addition, since magnetic saturation of the magnetic core can be prevented even when a large current is applied, the cross-sectional area of the magnetic core with respect to the magnetic flux can be reduced, thereby reducing the size, the mounting area, the material used, and the loss such as copper loss. be able to.

According to a tenth aspect of the present invention, the depth of the storage portion in which the coil is incorporated as the closed magnetic core is made larger than the height of the coil.
Since a space gap is formed between the outer side surface of the inner cylinder and the inner side surface of the outer cylinder of the magnetic core in the magnetic path through which the magnetic flux passes by the above configuration, magnetic saturation can be prevented without using a component such as a gap spacer. A gap can be provided, and the gap dimension can be shortened as compared with claim 6, so that the inductance can be improved.

According to an eleventh aspect of the present invention, one of the core or the peripheral wall of the core with a core is higher than the coil height and the other is lower than the coil height. In addition to the above, since a space gap is formed between the upper surface of the inner cylinder and the upper surface of the outer cylinder of the magnetic core in the magnetic path through which the magnetic flux passes, a gap for preventing magnetic saturation is provided without using a component such as a gap spacer. In addition to this, the gap size can be made longer than in claim 6, and the magnetic saturation characteristics can be improved.

According to a twelfth aspect of the present invention, there is provided a magnetic core with a core having a groove as a storage portion for storing a coil between a core having a center hole as a closed magnetic path core and a peripheral wall, and A ring-shaped magnetic core that fits in the upper part of the groove of the magnetic core. In addition to the same effect as in claim 1, the magnetic path length of the magnetic core in the magnetic path through which the magnetic flux passes is short, and the magnetic core in the magnetic path through which the magnetic flux passes , The characteristics such as inductance value, frequency characteristics, DC superimposed saturation characteristics, etc. can be adjusted to different characteristics even if the same magnetic material is used for the magnetic core. It is possible to reduce the quantity, product weight, and cost.

According to a thirteenth aspect of the present invention, the cored core and the ring-shaped core are made of materials having different magnetic properties. Therefore, in addition to the same effect as the twelfth aspect, the magnetic path through which the magnetic flux passes The magnetic path length due to the magnetic core is shorter than that of the plate-shaped magnetic core, and the cross-sectional area due to the magnetic core becomes smaller in the magnetic path through which the magnetic flux passes. Characteristics can be adjusted to different characteristics. Further, since the ring-shaped magnetic core is smaller than the plate-shaped magnetic core in claim 7, it is possible to reduce the amount of material used, the weight of the product, and the cost.

According to a fourteenth aspect of the present invention, the magnetic core is divided into two parts.
Alternatively, in addition to the same effects as those of 10, the choke coil can be formed by winding the winding in advance and inserting the magnetic core, so that the winding process is simplified and the cost can be reduced.

According to a fifteenth aspect of the present invention, the magnetic core divided into two parts is fixed by a spring. In addition to the same effect as in the second, third, sixth, or tenth aspect, the magnetic core is fixed by a spring. No need for adhesive, 2
The stability of the two magnetic cores is stable, the deterioration of the quality due to the deterioration of the adhesive, etc. is reduced, the copper wire coating is not destroyed by the adhesive, and the disassembly is easy, so the separation and disposal is easy and environmental measures are possible. Becomes

According to a sixteenth aspect of the present invention, a slit as a magnetic gap is formed in a part of the magnetic leg of the closed magnetic circuit core. In addition to the same effect as the eighth aspect, the magnetic flux generated by the coil is reduced. On the other hand, since there is a space gap, it is possible to prevent magnetic saturation when a large current flows. Further, by providing the space gap as a slit in the magnetic leg, a space gap can be provided without using components such as a gap spacer, and the number of parts, man-hours, and cost can be reduced.

According to a seventeenth aspect of the present invention, a coil is wound by feeding a copper wire from a slit serving as a magnetic gap. In addition to the same effect as in the sixteenth aspect, even after the winding, the coil is wound. A coil can be wound inside the magnetic core.

The invention according to claim 18 is the one in which the closed magnetic circuit core is constituted by two magnetic cores, wherein a gap spacer is interposed at the joint surface thereof.
In addition to the same effects as described above, a gap can be provided in the magnetic path through which the magnetic flux generated by the coil or the winding passes by sandwiching the gap spacer between the two magnetic cores. Since saturation can be prevented, the cross-sectional area of the magnetic core can be reduced, miniaturization, reduction of mounting area, reduction of materials used, reduction of loss such as copper loss, and change in thickness of gap spacer By doing so, the size of the gap can be easily and reliably adjusted, and the inductance and the DC superimposition characteristics can be arbitrarily adjusted.

According to a nineteenth aspect of the present invention, the coil incorporated in the closed magnetic circuit core is spirally wound,
In addition to the same effects as those of the first aspect, since the coil in the magnetic core is spirally wound and formed to have a low profile, the height of the product can be reduced.

According to a twentieth aspect of the present invention, the coil built in the closed magnetic core is wound by a solenoid.
In addition to the same effects as in claim 1, the bottom area of the coil is small, so that the bottom area of the product can be small, and the length of the magnetic path through which the magnetic flux generated by the winding passes is short, so that the inductance is high. Can be obtained.

According to a twenty-first aspect of the present invention, the coil built in the closed magnetic circuit core is resin-molded. In addition to the same effects as those of the first aspect, the coil is covered with a resin. Compared to the case where only air is around the coil, the heat generated from the coil during energization has a higher thermal conductivity to the outside and improves heat dissipation, so the copper wire diameter of the coil can be made smaller and the element can be downsized. As a result, the mounting area can be reduced, the material can be reduced, and the loss can be reduced. In addition, since the shape of the coil is stabilized by molding with mold resin, characteristics such as stray capacitance are stabilized, and the coil is covered with resin. As a result, quality deterioration such as film destruction, rare short circuit, copper wire corrosion and disconnection is reduced, and the coil is molded with mold resin and the shape is fixed. Coil insertion operation into Kugashi easy magnetic core is facilitated.

According to a twenty-second aspect of the present invention, the coil incorporated in the closed magnetic circuit core is molded with a ferrite resin. Since a magnetic core can also be constructed, a large inductance value and excellent magnetic saturation characteristics can be obtained even with a small size. By changing the material and dimensions of the ferrite resin, characteristics such as inductance value, frequency characteristics, and DC superimposed saturation characteristics can be obtained. Can be adjusted.

According to a twenty-third aspect of the present invention, the coil built in the storage part of the closed magnetic circuit core is held by a resin cast into the storage part. Since the coil is covered with resin, the heat generated from the coil when energized has a higher thermal conductivity to the outside and improves heat dissipation compared to the case where only the air is around the coil. Since the wire diameter can be reduced, the size of the element can be reduced, so that the mounting area can be reduced, the materials can be reduced, and the loss can be reduced. Stable, and because the coil is covered with resin, quality deterioration such as film destruction, rare short circuit, copper wire corrosion and disconnection is reduced, and there is no need for clearance between the coil and resin, resin and magnetic core. Conversion Achieved.

According to a twenty-fourth aspect of the present invention, the coil incorporated in the magnetic core of the closed magnetic path is wound edgewise using a rectangular wire. By winding the coil, the coil area ratio is improved as compared with a coil wound with a round wire, the element can be downsized, and the heat dissipation of the coil can be improved and the cross-sectional area of the copper wire can be reduced. It is possible to reduce the size, cost, mounting area, material, and loss.Also, the opposed area between the coil and the magnetic core is small, and the stray capacitance is small. The deterioration can be prevented, and the bottom area of the coil is formed small,
The bottom area of the product can be reduced, and the magnetic path length through which the magnetic flux generated by the winding passes can be shortened, so that a high inductance can be obtained.

According to a twenty-fifth aspect of the present invention, the coil incorporated in the magnetic core of the closed magnetic circuit is formed by winding a flat wire using a flat wire. Is wound flat, so that the coil can be wound low and the height of the product can be reduced.

According to a twenty-sixth aspect of the present invention, a coil formed by winding a flat wire in an edgewise manner is wound on the same plane with a wide surface up and down.
In addition to the same effect as described above, the coil can be wound further lower than in claim 25, and the product height can be reduced.

According to a twenty-seventh aspect of the present invention, the coil incorporated in the closed magnetic circuit core is made of a foil metal,
In addition to the same effects as those of the first aspect, winding the foil metal improves the linearity and the size of the element can be reduced, so that the cost can be reduced, the mounting area can be reduced, and the material can be reduced. The heat dissipation of the coil is improved, the cross-sectional area of the copper wire can be reduced, and the size, cost, mounting area, material, and loss can be reduced. Because the surface area is large and the thickness is small, eddy current loss due to the skin effect can be reduced, and copper loss can be reduced even when high-frequency current is applied. Two coils are wound in a bifilar shape. In this case, the magnetic coupling between the two coils can be improved, and the leakage inductance in the normal mode is reduced, so that magnetic saturation of the magnetic core can be prevented even when a large current is applied, and thus the cross-sectional area of the magnetic core is reduced. Small and Achieving further miniaturization since it is possible to prevent the magnetic saturation, light weight, compact mounting area, reduction of the material, it is possible to reduce the loss.

According to a twenty-eighth aspect of the present invention, the coil incorporated in the closed magnetic circuit core is constituted by two coils. In addition to the same effect as in the first aspect, the common mode is achieved by using two coils. Choke coils can be configured, or normal mode choke coils can be provided in two stages or on both lines.

According to a twenty-ninth aspect of the present invention, there are provided three coils incorporated in a closed magnetic circuit core. In addition to the same effects as those of the first aspect, three coils are provided in a three-phase power supply line. The coils can be used to form a common mode choke coil, or normal mode choke coils can be provided in three stages.

According to a thirtieth aspect of the present invention, the coil incorporated in the closed magnetic core is wound around the coil bobbin. In addition to the same effect as in the first aspect, the coil is wound around the coil bobbin. As compared with the case where only air is around the coil, the heat generated from the coil when energized has a higher thermal conductivity to the outside and improves heat dissipation, so the coil copper wire diameter can be made smaller and the element can be made smaller. The size of the mounting area can be reduced, the material can be reduced, and the loss can be reduced.Moreover, since the coil is wound around the coil bobbin and the shape of the coil is stabilized, characteristics such as stray capacitance and the like are stabilized, and Because the coil is covered by the coil bobbin, quality deterioration such as film destruction, rare short circuit, copper wire corrosion and disconnection is reduced, and the coil is covered by the coil bobbin and the shape is fixed. Coil insertion operation into the chuck is easily core of the coil portion is facilitated.

According to a thirty-first aspect of the present invention, the winding wound on the peripheral surface of the closed magnetic circuit core is formed by a rectangular wire. In addition to the same effects as in the first aspect, the winding of the rectangular wire is performed. As a result, the product ratio can be improved and the product can be downsized. Further, the heat dissipation is improved, so that the temperature rise can be reduced.

According to a thirty-second aspect of the present invention, two windings are wound around the peripheral surface of the closed magnetic core.
In addition to the same effects as described above, a common mode choke coil can be formed using two windings, or a normal mode choke coil can be provided in two stages or both lines.

According to a thirty-third aspect of the present invention, the number of windings wound around the peripheral surface of the closed magnetic core is three.
In addition to the same effects as described above, a common mode choke coil can be formed using three windings in a three-phase power supply line, or a normal mode choke coil can be provided in three stages.

According to a thirty-fourth aspect of the present invention, a normal mode choke coil is constituted by a coil incorporated in a closed magnetic circuit core, and a normal mode choke coil is constituted by a magnetic core wound around the peripheral surface of the closed magnetic circuit core. In addition, in addition to the same effect as in claim 1, two normal mode choke coils can be constituted by one element, and noises generated on each line connected to both lines of the circuit can be greatly reduced. When mounting on a circuit, capacitors, resistors,
By adding a varistor, etc., a filter circuit can be configured to further reduce noise.Furthermore, cost and man-hour can be reduced by reducing the number of components, and the mounting area can be reduced by reducing the size, and the material can be reduced. Reduction and loss can be achieved. It is also possible to arrange the normal mode choke coils in two lines on one side line by changing the wiring order with the same element.

According to a thirty-fifth aspect of the present invention, a normal mode choke coil is formed by a coil built in a closed magnetic circuit core, and magnetic fluxes generated in the normal mode cancel each other on the peripheral surface of the closed magnetic circuit core, and a common mode choke coil is provided. A common mode choke coil is formed by winding two windings in a direction in which magnetic fluxes generated at times are added.
In addition to the same effects as described above, an element exhibiting the characteristics of the normal mode choke coil and the common mode choke coil can be configured with one element, so that the reduction noise can be reduced in the normal mode choke coil portion, and the common mode choke coil portion can reduce the noise. Since high-frequency noise can be reduced, it is possible to reduce noise over a wide band with one element,
In addition, when mounted on a circuit, a capacitor, resistor, varistor, etc. can be added between the coils to form a filter circuit to further reduce noise, and further reduce costs and man-hours by reducing the number of components. The size of the mounting area can be reduced, the material can be reduced,
Loss can be reduced. It is also possible to arrange the normal mode choke coil in the subsequent stage and the common mode choke coil in the preceding stage by changing the wiring order with similar elements.

According to a thirty-sixth aspect of the present invention, the two magnetic fluxes are built in a closed magnetic circuit core and are wound in a direction in which the magnetic fluxes generated in the normal mode cancel each other and the magnetic fluxes generated in the common mode are added. A common mode choke coil is formed by using a coil, and a normal mode choke coil is formed by a winding wound around a peripheral surface of a closed magnetic circuit core. A normal mode choke coil and a common mode choke coil can be configured with the element, the low frequency noise can be reduced in the normal mode choke coil part, and the high frequency noise can be reduced in the common mode choke coil part. Can be reduced, and when mounted on a circuit, capacitors and resistors,
By adding a varistor, etc., a filter circuit can be configured to further reduce noise.Furthermore, cost and man-hour can be reduced by reducing the number of components, and the mounting area can be reduced by reducing the size, and the material can be reduced. Reduction and loss can be achieved. It is also possible to arrange the normal mode choke coil in the subsequent stage and the common mode choke coil in the preceding stage by changing the wiring order with similar elements.

According to a thirty-seventh aspect of the present invention, the two magnetic fluxes are built in a closed magnetic circuit core and are wound in a direction in which the magnetic fluxes generated in the normal mode cancel each other, and the magnetic fluxes generated in the common mode are added. A coil is used to form a common mode choke coil, which is wound around the circumference of the magnetic core of a closed magnetic circuit, and the magnetic fluxes generated in the normal mode cancel each other out, and the magnetic fluxes generated in the common mode are added together. A common mode choke coil is constituted by the two windings described above. In addition to the same effect as in claim 1, two common mode choke coils can be constituted by one element, and two stages are provided on both lines of the circuit. A common mode choke coil can be configured to reduce common mode noise generated on both lines, and between each coil when mounted on a circuit. By adding a capacitor, resistor, varistor, etc., a filter circuit can be configured to further reduce noise, reduce the number of parts, reduce cost and man-hours, and reduce the mounting area by reducing the size. It is possible to reduce the size, the material, and the loss. Also, by changing the wiring order with the same element, a common mode choke coil using
It is also possible to arrange a common mode choke coil formed by winding at a subsequent stage.

According to a thirty-eighth aspect of the present invention, there are provided three magnetic coils which are built in a closed magnetic circuit core and which are wound in a direction in which magnetic fluxes generated in a normal mode cancel each other and magnetic fluxes generated in a common mode are added. A common mode choke coil is constituted by using a coil, and a normal mode choke coil is constituted by a winding wound around a peripheral surface of a closed magnetic circuit core. In addition to the same effect as in claim 1, one element is provided. Can form a normal mode choke coil and a common mode choke coil for a three-phase power line, and can reduce low-frequency noise in the normal mode choke coil portion.
High-frequency noise can be reduced in the common mode choke coil part, so it is possible to reduce noise over a wide band with a single element. When mounting on a circuit, add capacitors, resistors, varistors, etc. between each coil. By configuring a filter circuit, noise can be further reduced.Furthermore, cost reduction and man-hour reduction can be achieved by reducing the number of parts, and downsizing reduces the mounting area, material, and loss. Can be achieved. It is also possible to arrange the normal mode choke coil in the latter stage and the common mode choke coil in the former stage by changing the above wiring order with the same element, so that low-frequency noise can be reduced in the normal mode choke coil portion. ,
High frequency noise can be reduced in the common mode choke coil part, so it is possible to reduce noise over a wide band with one element. Furthermore, when mounting on a circuit, add capacitors, resistors, varistors, etc. between each coil. By configuring a filter circuit, noise can be further reduced.
Further, cost reduction and man-hour reduction can be achieved by reducing the number of parts, and downsizing can reduce the mounting area, material and loss. It is also possible to arrange the normal mode choke coil in the subsequent stage and the common mode choke coil in the preceding stage by changing the wiring order with similar elements.

According to a forty-seventh aspect of the present invention, three magnetic fluxes are incorporated in a closed magnetic core so that magnetic fluxes generated in a normal mode cancel each other and magnetic fluxes generated in a common mode are added. A common mode choke coil is formed by using coils, and three magnetic fluxes are wound on the peripheral surface of the closed magnetic circuit core in a direction in which the magnetic fluxes generated in the normal mode cancel each other, and the magnetic fluxes generated in the common mode are added. A common mode choke coil is constituted by windings. In addition to the same effect as in claim 1, two types of common mode choke coils corresponding to a three-phase circuit can be constituted by one element, and each line of the circuit can be constituted. Since a common mode choke coil can be configured in two stages, common mode noise generated in each line can be greatly reduced. By adding a capacitor, resistor, varistor, etc. between each coil, a filter circuit can be configured to further reduce noise, and by reducing the number of parts, cost and man-hours can be reduced. Accordingly, the mounting area can be reduced, the material can be reduced, and the loss can be reduced. It is also possible to arrange the common mode choke coil using coils in the first stage and the common mode choke coil using windings in the second stage by changing the above wiring order with similar elements.

According to a forty-first aspect of the present invention, a plurality of coils are spirally wound and laminated on one central axis to constitute a common mode choke coil. In addition to the same effects as above, magnetic coupling can be improved by reducing the distance between the multiple coils, and the leakage inductance in the normal mode is reduced, thus preventing magnetic saturation of the magnetic core even when a large current is applied. In addition, magnetic saturation can be prevented even if the cross-sectional area of the magnetic core is small, so that downsizing can be achieved, and weight and mounting area can be reduced, materials can be reduced, and loss can be reduced. Since the coil can be formed with a low profile, the product height can be reduced.

According to a twenty-second aspect of the present invention, a plurality of coils are wound in a solenoid shape and arranged in a bifilar shape to form a common mode choke coil. In addition to the effect, the magnetic coupling of the plurality of coils can be further improved as compared with claim 41, and the leakage inductance in the normal mode is reduced, so that magnetic saturation of the magnetic core can be prevented even when a large current is applied, Even if the cross-sectional area of the magnetic core is small, magnetic saturation can be prevented, so downsizing can be achieved, reducing weight, reducing mounting area, reducing materials,
The loss can be reduced, and the magnetic path length through which the magnetic flux generated by the winding passes becomes short, so that a high inductance can be obtained. Furthermore, since the bottom area of the coil is formed small, the bottom area of the product is reduced. can do.

According to a thirty-third aspect of the present invention, the entirety is housed in an insulating case. In addition to the same effects as in the first aspect, the use of the insulating case secures the insulation distance not by a space distance but by a creepage distance. Therefore, the size of the product can be reduced, and since the parts are covered with the case, vibrations, impacts, temperature changes, and the like on the parts from the outside are reduced, and the quality is improved.

According to a forty-fourth aspect of the present invention, the mounting foot is provided on the mounting surface of the insulating case. In addition to the same effect as in the forty-third aspect, by providing the mounting foot on the insulating case, a separate mounting part is provided. It is possible to fix the product without providing the components, and to prevent an increase in the number of parts and man-hours.

According to a forty-fifth aspect of the present invention, a surface-mountable terminal is provided on the mounting surface of the insulating case to connect a coil and a winding. At the same time as the connection, mechanical mounting can be achieved, and the number of product mounting steps can be reduced.

According to the invention described in claim 46, the closed magnetic circuit core divided into two parts is fixed by an insulating case,
In addition to the same effect as that of claim 43, by fixing the magnetic core by the insulating case, the magnetic core can be fixed without using an adhesive or a spring, and the number of parts and man-hours can be reduced.

According to a forty-seventh aspect of the present invention, the entirety is formed by resin molding. By covering the entirety with the resin mold, the same effect as in claim 43 is obtained, and the number of parts can be reduced without using a plurality of cases. The number of steps can be reduced, and since the component and the resin are formed in close contact with each other, heat radiation is high, and there is no need to provide a clearance between the component and the resin, so that the product can be downsized.

According to a forty-eighth aspect of the present invention, the winding is wound first on the circumference of the closed magnetic circuit core, and one end of the previously wound coil is inserted into a part of the coil accommodating portion of the magnetic core to rotate spirally. The coil is inserted into the magnetic core. In addition to the same effect as in the first aspect, the coil can be wound in advance outside the magnetic core, so that the winding process is simplified and the cost can be reduced. .

According to a fifty-ninth aspect of the present invention, a closed magnetic path core having a center hole is formed around a coil wound in advance by a dust core formed by dust molding a dust core material. In addition, in addition to the same effects as those of the first aspect, a magnetic core can be integrally formed by incorporating a coil, and a high inductance can be obtained because a space gap does not occur in a magnetic path. Are closely adhered to each other, so that heat dissipation is high and the temperature rise can be reduced.Furthermore, there is no need for clearance between the coil and the magnetic core, so the product can be downsized, and the characteristics are stable because the coil is held by the magnetic core. Since the coil is sealed by the magnetic core, the quality is stable.

According to a fiftyth aspect of the present invention, a closed magnetic circuit core having a center hole is formed by molding a ferrite resin around a coil wound in advance. A magnetic core can be configured as an integral type with a built-in coil, and high inductance can be obtained because there is no space gap in the magnetic path.Furthermore, the heat dissipation is high and the temperature rises because the coil and the magnetic core are in close contact The product can be downsized because there is no need for clearance between the coil and the magnetic core, and the characteristics are stable because the coil is held by the magnetic core. Is also stable.

Hereinafter, various embodiments of the present invention will be described with reference to the drawings. (Embodiment 1) A first embodiment of a choke coil according to the present invention will be described with reference to FIGS.

FIG. 1 is a perspective view of a finished product of a choke coil according to the first embodiment of the present invention, FIG. 2 is a sectional view thereof, and FIG. 3 is a plan view thereof.

1 to 3, reference numeral 10 denotes a ring-shaped magnetic core having a center hole 11 made of a magnetic material such as ferrite, 12 denotes a coil arranged concentrically inside the magnetic core 10, and 13 denotes a magnetic core. Center hole 11 in the outer peripheral surface of
, 14 denotes a magnetic flux generated by the coil 12, and 15 denotes a magnetic flux generated by the winding 13.

In the above configuration, a magnetic flux 14 is generated in a direction surrounding the periphery of the coil 12 by flowing a current through the coil 12, and a magnetic flux 15 is generated in a circumferential direction of the magnetic core 10 by flowing a current through the winding 13. , The magnetic flux 14 and the magnetic flux 15 are made orthogonal.

With this configuration, one magnetic core 1
0 makes it possible to configure two types of choke coils, and by reducing the number of parts, cost and man-hours can be reduced, as well as downsizing, weight and mounting area, materials used, and copper loss. Loss can be reduced.

The magnetic core 10 can be formed as an integral magnetic core by molding a dust core material around the coil 12 using a dust core material.

As another example, a ferrite resin may be used, and the ferrite resin may be molded around the coil 12 to form the magnetic core 10 as an integrated product.

Since the magnetic core 10 does not have a space gap in the magnetic path, a high inductance can be obtained, and since the coil 12 and the magnetic core 10 are in close contact with each other, the heat radiation is high and the temperature rise can be reduced. Furthermore, since there is no clearance between the coil 12 and the magnetic core 10, the size can be reduced, and the coil 12 is held by the magnetic core 10, so that the characteristics are stable, and the coil 12 is sealed by the magnetic core 10, so that the quality is stable. Things.

(Embodiment 2) A second embodiment of the present invention will be described with reference to FIGS. FIG. 4 is a perspective view of a finished product of the choke coil according to the second embodiment of the present invention, FIG. 5 is a sectional view of the same, and FIG. 6 is an exploded perspective view of a main part.
According to the drawing, 12 is a coil, 13 is a winding, 10 is a magnetic core, which is composed of a first magnetic core 16 and a second magnetic core 17, and the first magnetic core 16 has an inner cylinder 16a and an outer cylinder 16b at one end thereof. The second magnetic core 17 has a plate-like configuration having a center hole 11. 14 is a magnetic flux generated by the coil 12, and 15 is a magnetic flux generated by the winding 13.

The configuration and operation will be described below. The coil 12 wound in advance is inserted between the inner cylinder 16a and the outer cylinder 16b of the first magnetic core 16, the coil insertion portion of the first magnetic core 16 is covered with the second magnetic core 17, and the winding 13 is removed. First and second magnetic cores 1
It is wound around the outer peripheral surface of the magnetic core 10 through the central holes 11 of the magnetic cores 6 and 17. At this time, the magnetic flux 14 is applied to the inner cylinder 16a of the first magnetic core 16,
The outer cylinder 16 of the second magnetic core 17 and the first magnetic core 16 thereon
b, the first magnetic core 16 flows in a loop with one end of the first magnetic core 16 closing the inner cylinder 16a and the outer cylinder 16b. Also, the magnetic flux 15 is
The inner cylinder 16a of the first magnetic core 16 around the center axis of
It flows through the outer cylinder 16 b, one end that closes the inner cylinder 16 a and the outer cylinder 16 b, and the second magnetic core 17.

Therefore, in addition to the same effects as in the first embodiment,
With the above configuration, the coil 12 can be easily and reliably housed in the magnetic core 10.

Further, when the cross-sectional area of the magnetic core in the magnetic path through which the magnetic flux 14 flows is made constant, the inner cylinder 16 of the first magnetic core 16
a, the outer cylinder 16b is thinned so that the respective cross-sectional areas in a plane perpendicular to the central axis are equal, one end of the first magnetic core 16 that closes the inner cylinder 16a and the outer cylinder 16b, and the second The thickness of the magnetic core 17 is set so that the cross-sectional areas on the plane equidistant from the central axis are equal. Further, the characteristics of the choke coil may be changed by changing the above dimension setting to change the cross-sectional area in the magnetic path.

(Embodiment 3) A third embodiment of the present invention will be described with reference to FIGS. 7 is a perspective view of a finished product of the choke coil according to the third embodiment, FIG. 8 is a sectional view of the same, and FIG. 9 is an exploded perspective view of a main part. According to the drawing, 10 is a magnetic core, 12 is a coil, 13 is a winding, 16 is a first magnetic core which closes an inner cylinder 16a and an outer cylinder 16b constituting the magnetic core 10 at one end thereof, and 17 is a center hole 11. A plate-like second magnetic core 14 has a magnetic flux 14 generated by the coil 12, and a gap spacer 18 having a center hole 11.

The configuration and operation will be described below. The coil 12 wound in advance is connected to the inner cylinder 16 a and the outer cylinder 16 of the first magnetic core 16.
b, the coil insertion portion of the first magnetic core 16 is covered by the second magnetic core 17 with the gap spacer 18 interposed therebetween,
The winding 13 is wound around the outer peripheral surface of the magnetic core 10 through the first magnetic core 16, the second magnetic core 17, and the center hole 11 of the gap spacer 18.

Therefore, in addition to the same effects as in the second embodiment,
By sandwiching the gap spacer 18 between the first magnetic core 16 and the second magnetic core 17, a gap can be provided in the magnetic path through which the magnetic flux 14 generated by the coil 12 passes, and the magnetic core 10 can be moved even when a large current is applied. Since magnetic saturation can be prevented, the cross-sectional area of the first magnetic core 16 and the second magnetic core 17 with respect to the magnetic flux 14 can be reduced, so that the size, the mounting area, the material used, and the copper loss can be reduced. Can be achieved.

Further, by changing the thickness of the gap spacer 18, the dimension of the gap can be easily and surely adjusted, and the inductance and the DC superimposition characteristics can be arbitrarily adjusted.

(Embodiment 4) A fourth embodiment of the present invention will be described with reference to FIGS. FIG. 10 is a perspective view of a finished product of the choke coil according to the fourth embodiment,
FIG. 11 is a sectional view of the same, and FIG. 12 is an exploded perspective view of the main part. According to FIG. 1, reference numeral 10 denotes a magnetic core, 12 denotes a coil, and 13 denotes a winding. The magnetic core 10 has a structure in which an inner cylinder 16a and an outer cylinder 16b are closed at one end thereof, and 14 denotes a coil 12
Is a space gap in the magnetic path through which the magnetic flux 14 passes, and the winding height of the coil 12 is equal to the inner cylinder 16 a and the outer cylinder 16 b of the coil housing portion of the magnetic core 10.

The configuration and operation will be described below. The coil 12 wound in advance is inserted between the inner cylinder 16a and the outer cylinder 16b of the magnetic core 10, and the winding 13 is wound around the outer peripheral surface of the magnetic core 10 through the center hole 11 of the magnetic core 10.

Therefore, according to the above configuration, the upper surface of the inner cylinder 16a of the magnetic core 10 and the outer cylinder 16b in the magnetic path through which the magnetic flux 14 passes.
Since the space gap 19 is formed between the upper surfaces of the magnetic cores, a gap can be provided without using a component such as a gap spacer, and the magnetic saturation of the magnetic core 10 can be prevented even when a large current is applied. Core 1 for
The cross-sectional area of 0 can be reduced, miniaturization, reduction of mounting area,
It is possible to reduce the amount of materials used and the loss such as copper loss.

(Fifth Embodiment) A fifth embodiment of the present invention will be described with reference to FIGS. FIG. 13 is a perspective view of a finished product of the choke coil according to the fifth embodiment,
FIG. 14 is a sectional view of the same, and FIG. 15 is an exploded perspective view of the main part. According to the drawing, reference numeral 10 denotes a magnetic core, 12 denotes a coil, and 13 denotes a winding. The magnetic core 10 has a structure in which the inner cylinder 16a and the outer cylinder 16b are closed at one end thereof, and 14 denotes a magnetic flux generated by the coil 12; Is a space gap in the magnetic path through which the magnetic flux 14 passes, and the height of the inner cylinder 16 a and the outer cylinder 16 b of the coil storage portion in the magnetic core 10 is higher than the winding height of the coil 12.

The configuration and operation will be described below. The coil 12 wound in advance is inserted between the inner cylinder 16a and the outer cylinder 16b of the magnetic core 10, and the winding 13 is wound around the outer peripheral surface of the magnetic core 10 through the center hole 11 of the magnetic core 10.

Therefore, in addition to the same effects as in the fourth embodiment,
With the above configuration, the magnetic core 10
Since the space gap 20 is formed between the outer side surface of the inner cylinder 16a and the inner side surface of the outer cylinder 16b, a gap for preventing magnetic saturation can be provided without using a component such as a gap spacer. As compared with the fourth embodiment, the gap size can be reduced, and the inductance can be improved.

(Embodiment 6) A sixth embodiment of the present invention will be described with reference to FIGS. FIG. 16 is a perspective view of a finished product of the choke coil according to the sixth embodiment.
FIG. 17 is a sectional view of the same, and FIG. 18 is an exploded perspective view of the main part. According to the drawing, reference numeral 10 denotes a magnetic core, 12 denotes a coil, and 13 denotes a winding. The magnetic core 10 is constituted by using first and second magnetic cores 16 in which an inner cylinder 16a and an outer cylinder 16b are closed at one end thereof. 14 is a magnetic flux generated by the coil 12, 21 is a space gap in a magnetic path through which the magnetic flux 14 passes, and one of the inner cylinder 16 a and the outer cylinder 16 b of the coil housing portion of the magnetic core 10 has a winding height of the coil 12. Higher and the other lower.

The configuration and operation will be described below. The coil 12 wound in advance is inserted between the inner cylinder 16a and the outer cylinder 16b of the magnetic core 10, and the winding 13 is wound around the outer peripheral surface of the magnetic core 10 through the center hole 11 of the magnetic core 10.

Therefore, in addition to the same effects as in the fourth embodiment,
With the above configuration, the magnetic core 10 is placed in the magnetic path through which the magnetic flux 14 passes.
Since the space gap 21 is formed between the upper surface of the inner cylinder 16a and the upper surface of the outer cylinder 16b, a gap for preventing magnetic saturation can be provided without using a component such as a gap spacer. The gap size can be made longer than that of the above, and the magnetic saturation characteristics can be improved.

(Seventh Embodiment) A seventh embodiment of the present invention will be described with reference to FIGS. FIG. 19 is a perspective view of a finished product of the choke coil according to the seventh embodiment,
FIG. 20 is a sectional view of the same, and FIG. 21 is an exploded perspective view of the main part. According to the drawing, reference numeral 10 denotes a magnetic core, 12 denotes a coil, 13 denotes a winding, and 16 denotes a configuration in which the inner cylinder 16a and the outer cylinder 16b are closed at one end thereof by first and second magnetic cores constituting the magnetic core 10. ing.

The structure and operation will be described below. The coil 12 wound in advance is housed so as to be sandwiched between the inner cylinder 16a and the outer cylinder 16b by the two magnetic cores 16, and the winding 13 is
And wound around the outer peripheral surface of the magnetic core 10.

Therefore, according to the above configuration, the coil 12 can be easily and reliably housed in the magnetic core 10, and the two magnetic cores 16 can be formed in the same shape. In the case of molding, the magnetic core 16 can be manufactured with one type of mold. Further magnetic core 10
The depth of the coil accommodating portion can be reduced to half of the depth of the magnetic core of the second to sixth embodiments, and the molding of the magnetic core 16 becomes easy.

(Eighth Embodiment) An eighth embodiment of the present invention will be described with reference to FIGS. FIG. 22 is a perspective view of a finished product of the choke coil according to the eighth embodiment,
FIG. 23 is a sectional view of the same, and FIG. 24 is an exploded perspective view of the main part. According to the drawing, 10 is a magnetic core, 12 is a coil, 13 is a winding, and 16 is an inner cylinder 16a and an outer cylinder 16b constituting the magnetic core 10.
, The first and second magnetic cores,
Reference numeral 4 denotes a magnetic flux generated by the coil 12, and reference numeral 22 denotes a ring-shaped gap spacer having two different sizes.

The structure and operation will be described below. The previously wound coil 12 is sandwiched between two magnetic cores 16 with a gap spacer 22 interposed therebetween.
The winding 13 is wound around the outer peripheral surface of the magnetic core 10 through the two magnetic cores 16 and the center hole 11 of the gap spacer 22.

Therefore, in addition to the same effects as in the seventh embodiment,
By sandwiching the gap spacer 22 between the two magnetic cores 16, a gap can be provided in the magnetic path through which the magnetic flux 14 passes, and magnetic saturation of the magnetic core 10 can be prevented even when a large current is applied. The cross-sectional area of the magnetic core 16 with respect to 14 can be reduced, and the size, the mounting area, the material used, and the loss such as copper loss can be reduced.

Further, by changing the thickness of the gap spacer 22, the dimension of the gap can be easily and surely adjusted, and the inductance and the DC superimposition characteristics can be arbitrarily adjusted.

(Embodiment 9) A ninth embodiment of the present invention will be described with reference to FIGS. FIG. 25 is a perspective view of a finished product of the choke coil according to the ninth embodiment;
FIG. 26 is a sectional view of the same, and FIG. 27 is an exploded perspective view of the main part. According to the figure, 12 is a coil, 13 is a winding, 23 is an inner cylindrical magnetic core, 24 is an outer cylindrical magnetic core, and 14 is a coil 1
The magnetic flux 25 generated by the magnetic flux 2 is a space gap in the magnetic path through which the magnetic flux 14 passes. Two cylindrical magnetic cores 23, 24
Constitute the magnetic core 10.

The structure and operation will be described below. The coil 12 wound in advance is wound on the inner cylindrical magnetic core 23 and the outer cylindrical magnetic core 2.
4 and the winding 13 is inserted into the center hole 11 of the cylindrical magnetic core 23.
And wound around the cylindrical magnetic cores 23 and 24.

Therefore, according to the above configuration, the inner cylindrical magnetic core 23 and the outer cylindrical magnetic core 24 in the magnetic path through which the magnetic flux 14 passes.
Since the space gap 25 is formed between the upper surfaces and between the bottom surfaces of the above, a gap can be provided without using a component such as a gap spacer, and magnetic saturation of the magnetic core can be prevented even when a large current flows. Thus, the cross-sectional area of the cylindrical magnetic core 24 with respect to the magnetic flux 14 can be reduced, and the size, the mounting area, the material used, and the loss such as copper loss can be reduced. Further, since the top and bottom surfaces of the coil 12 are not sealed, the heat radiation is good, the copper wire diameter can be reduced, and the element can be downsized. Further, the height, distance, and positional relationship of the inner cylindrical magnetic core 23 and the outer cylindrical magnetic core 24 are changed to adjust the gap size, and the inductance and the DC superimposition characteristics can be arbitrarily adjusted.

(Embodiment 10) A tenth embodiment of the present invention will be described with reference to FIGS. FIG.
8 is a perspective view of a completed product of the choke coil according to the tenth embodiment, FIG. 29 is a sectional view of the choke coil, and FIG. 30 is an exploded perspective view of the essential part. According to the figure, 12 is a coil, 13 is a winding, 26
Is an inner wound core, and 27 is an outer wound core. The cores 26 and 27 constitute the magnetic core 10.

The structure is shown below. Pre-wound coil 1
2 and the inner core 26 and the outer core 2 of the magnetic core 10.
7, and the winding 13 is wound so as to pass through the center hole 11 of the winding core 26 and to straddle both winding cores 26 and 27.

Therefore, in addition to the same effects as in the ninth embodiment,
The cores 26 and 27 of high magnetic permeability and high magnetic saturation density are
By using 0, a high-performance choke coil having a large inductance value and hardly causing magnetic saturation even when a large current is applied can be realized.

(Embodiment 11) An eleventh embodiment of the present invention will be described with reference to FIGS. FIG.
1 is a perspective view of a completed product of the choke coil of the eleventh embodiment, FIG. 32 is a cross-sectional view of the same, FIG. 33 is an exploded perspective view of the main part, and FIGS. FIG. 36 is an explanatory diagram showing the direction of magnetic flux due to the magnetic field, FIG.
7 is a frequency characteristic diagram of impedance, and FIG. 38 is a noise measurement data diagram.

According to the drawing, reference numeral 12 denotes a coil wound inside the magnetic core 10 in the circumferential direction of the magnetic core 10, and 13 a and 13 b pass through the center hole 11 of the magnetic core 10 and are wound around the outer peripheral surface of the magnetic core 10. The first and second windings, 16 and 17 are the first and second cores constituting the magnetic core 10 of the closed magnetic circuit, 14 is the magnetic flux generated by the coil 12, and 15a and 15b are the windings 13a respectively. , 13b, 18 is a gap spacer, 28 is a power supply, 29 is a load, 30a is a line current, and 30b is a current flowing in the same direction.

The structure and operation will be described below. Coil 12
, And inserted into the first magnetic core 16 forming a closed magnetic circuit, covered with the second magnetic core 17 with the gap spacer 18 interposed therebetween, and the windings 13a and 13b are connected to the first magnetic core 16 and the 2
Is wound around the outer peripheral surface of the magnetic core 10 through the center hole 11 of the magnetic core 17. Then, one end of the coil 12 and the power supply 28 are connected,
The other end of the coil 12 is connected to one end of the winding 13a, and the other end of the winding 13a is connected to the load 29. The other end of the load 29 is connected to one end of the winding 13b,
b and the other end of the power supply 28 are connected.

At this time, the coil 12 generates a magnetic flux 14 in a direction rotating around the circumferential direction of the magnetic core 10 as a central axis, and the magnetic flux 1
A normal mode choke coil is formed by providing a gap spacer 18 in the magnetic path through which the wire 4 passes. And the winding 13
a, 13b are magnetic fluxes 15a,
15b are cancelled, and are wound in a direction in which the magnetic fluxes 15a and 15b are added to the current 30b in the same direction, thereby forming a common mode choke coil.

Therefore, with the above configuration, an element exhibiting the characteristics of the normal mode choke coil and the common mode choke coil can be constituted by one element as shown in FIG. Therefore, low-frequency noise can be reduced in the normal mode choke coil portion, and high-frequency noise can be reduced in the common mode choke coil portion, so that it is possible to reduce noise over a wide band with one element. When it is actually mounted on a power supply circuit of an air conditioner, noise reduction is observed over a wide band as shown in FIG. Further, at the time of mounting on a circuit, a capacitor, a resistor, a varistor, and the like can be added between the coils to form a filter circuit to further reduce noise. Furthermore, cost reduction and man-hour reduction can be achieved by reducing the number of parts. The downsizing can reduce the mounting area, reduce materials, and reduce loss. Compared to a case where two normal mode choke coils and one common mode choke coil are used, a volume ratio of about 32%, a weight cost of about 10%, and a mounting area of about 43% are reduced.

It is also possible to arrange the normal mode choke coil at the rear stage and the common mode choke coil at the front stage by changing the wiring order with the same element.

(Twelfth Embodiment) A twelfth embodiment of the present invention will be described with reference to FIGS. FIG.
9 is a perspective view of a finished product of the choke coil of the twelfth embodiment, FIG. 40 is a sectional view of the same, FIG. 41 is an exploded perspective view of the same main part, and FIG. 42 is a connection diagram showing the direction of magnetic flux in the normal mode. FIG. 43 is a connection diagram illustrating the direction of magnetic flux in the common mode, and FIG. 44 is a circuit configuration diagram. According to the drawing, reference numerals 12a and 12b denote a first coil and a second coil 13 wound around the core 10 in the circumferential direction of the core 10.
Are windings wound around the outer peripheral surface of the magnetic core 10 through the central hole 11 of the magnetic core 10, and 31 and 32 are gaps 33, which are formed by slits at a part of the peripheral surface from the central hole 11 constituting the magnetic core 10 of the closed magnetic circuit. 34, a first magnetic core and a second magnetic core, 14a,
14b is a magnetic flux generated by the coils 12a and 12b, 1
5 is a magnetic flux generated by the winding 13, 28 is a power supply, 29 is a load, 30a is a line current, and 30b is a current flowing in the same direction.

The structure and operation will be described below. Coil 12
a, 12b wound to form a first magnetic core 31 forming a closed magnetic circuit
, And covered with a second magnetic core 32, and the winding 13 is
It is wound around the outer peripheral surfaces of the magnetic cores 31 and 32 through the center holes 11 of the magnetic cores 31 and 32. Then, one end of the winding 13 is connected to the power supply 28, the other end of the winding 13 is connected to one end of the coil 12b, and the other end of the coil 12b is connected to the load 29.
Then, the other end of the load 29 is connected to one end of the coil 12a, and the other end of the coil 12a is connected to the other end of the power supply 28. At this time, the coils 12a and 12b
The magnetic fluxes 14a and 14b cancel each other with respect to 0a, and are wound in a direction in which the magnetic fluxes 14a and 14b are added with respect to the current 30b in the same direction, thereby forming a common mode choke coil. Then, the winding 13 has a magnetic flux 14 in the circumferential direction of the magnetic core 10.
b in the magnetic path through which the magnetic flux 14b passes.
The normal mode choke coil is formed by providing the reference numerals 3 and 34.

Therefore, with the above configuration, a normal mode choke coil and a common mode choke coil can be formed with one element, low-frequency noise can be reduced at the normal mode choke coil portion, and high-frequency noise can be reduced at the common mode choke coil portion. Since the noise can be reduced, the noise can be reduced over a wide band with one element. When mounted on a circuit, a filter circuit can be formed by adding a capacitor, a resistor, a varistor, and the like between the coils to further reduce noise. Furthermore, cost reduction and man-hour reduction can be achieved by reducing the number of parts. The downsizing can reduce the mounting area, reduce materials, and reduce loss.

It is also possible to arrange the normal mode choke coil in the latter stage and the common mode choke coil in the former stage by changing the wiring order with the same element.

(Thirteenth Embodiment) A thirteenth embodiment of the present invention will be described with reference to FIGS. FIG.
5 is a perspective view of a finished product of the choke coil according to the thirteenth embodiment, FIG. 46 is a sectional view of the same, and FIG. 47 is an exploded perspective view of the essential parts. According to the drawing, 12a and 12b are first coils wound in a spiral shape in the circumferential direction of the magnetic core 10 inside the magnetic core 10.
And the second coil 13 are the center hole 11 of the magnetic core 10.
Wound on the outer peripheral surface of the magnetic core 10 through
Is a closed magnetic circuit core having gaps 33 and 34 constituting the magnetic core 10.

The structure and operation will be described below. Coil 12
a and 12b are spirally wound, inserted into a first magnetic core 31 constituting a closed magnetic circuit, covered with a second magnetic core 32, and the winding 13 is passed through the center hole 11 of the magnetic core 10 to form a magnetic core 10a.
Wrap around the outer surface of. At this time, the coils 12a and 12b are wound in a direction in which the magnetic flux is canceled with respect to the line current, and the magnetic flux is added with respect to the current in the same direction, thereby forming a common mode choke coil. The winding 13 generates a magnetic flux in the circumferential direction of the magnetic core 10, and gaps 33 and 34 are provided in a magnetic path through which the magnetic flux passes to constitute a normal mode choke coil.

Therefore, with the above configuration, in addition to the same effect as in the twelfth embodiment, the distance between the two coils 12a and 12b can be reduced to improve the magnetic coupling, and the leakage inductance in the normal mode is reduced. Therefore, magnetic saturation of the magnetic core can be prevented even when a large current is applied. Therefore, magnetic saturation can be prevented even if the cross-sectional area of the magnetic core is small, so that downsizing can be achieved, and weight reduction, downsizing of mounting area, reduction of materials, and reduction of loss can be achieved.

(Embodiment 14) A fourteenth embodiment of the present invention will be described with reference to FIGS. FIG.
8 is a perspective view of a finished product of the choke coil according to the fourteenth embodiment, FIG. 49 is a sectional view of the same, and FIG. 50 is an exploded perspective view of the essential parts. According to FIG. 1, 12a and 12b are first solenoids wound inside the magnetic core 10 in the circumferential direction of the magnetic core 10.
And the second coil 13 are the center hole 11 of the magnetic core 10.
Wound on the outer peripheral surface of the magnetic core 10 through
Are first and second magnetic cores having gaps 33 and 34 constituting the magnetic core 10.

The structure and operation will be described below. Coil 12
a and 12b are wound in a solenoid shape, and the two coils 12a and 12b are arranged in a bifilar shape, inserted into a first magnetic core 31 constituting a closed magnetic circuit, covered with a second magnetic core 32, and wound. The wire 13 is wound around the outer peripheral surface of the magnetic core 10 through the center hole 11 of the magnetic core 10. At this time, the coils 12a, 12
b is wound in a direction in which the magnetic flux is offset with respect to the line current, and the magnetic flux is added with respect to the current in the same direction, thereby forming a common mode choke coil. And the winding 13 is
A magnetic flux is generated in the circumferential direction of the magnetic core 10, and gaps 33 and 34 are provided in a magnetic path through which the magnetic flux passes to constitute a normal mode choke coil.

Therefore, with the above configuration, in addition to the same effects as in the twelfth embodiment, the magnetic coupling between the two coils 12a and 12b can be further improved as compared with the thirteenth embodiment, and the leakage inductance in the normal mode can be reduced. Therefore, magnetic saturation of the magnetic core 10 can be prevented even when a large current is applied. Accordingly, even if the cross-sectional area of the magnetic core 10 is small, magnetic saturation can be prevented, so that downsizing can be achieved, and weight reduction, downsizing of mounting area, reduction of materials, and reduction of loss can be achieved.

(Embodiment 15) A fifteenth embodiment of the present invention will be described with reference to FIGS. FIG.
1 is a perspective view of a finished product of the choke coil according to the fifteenth embodiment, FIG. 52 is a sectional view of the same, FIG. 53 is an exploded perspective view of the essential parts, FIG. 54 is a connection diagram, and FIG. 55 is a circuit configuration diagram. . According to the drawing, reference numeral 12 denotes a coil wound inside the magnetic core 10 in the circumferential direction of the magnetic core 10, reference numeral 13 denotes a winding wound around the outer peripheral surface of the magnetic core 10 through the center hole 11 of the magnetic core 10, and 31, 32. Are first and second having gaps 33 and 34 constituting the magnetic core 10.
Is a magnetic flux generated by the coil 12, 15 is a magnetic flux generated by the winding 13, 18 is a gap spacer, 28 is a power supply, 29 is a load, and 30a is a line current.

The configuration and operation will be described below. Coil 12
, And inserted into a first magnetic core 31 constituting a closed magnetic circuit, covered with a second magnetic core 32 with a gap spacer 18 interposed therebetween, and the winding 13 is wound on the first and second magnetic cores 31, 31. 32, wound around the outer peripheral surfaces of the first and second magnetic cores 31, 32 through the center hole 11 of the gap spacer 18. And the coil 12
Is connected to the power supply 28, and the other end of the coil 12 is connected to the load 29. And the other end of the load 29 and the winding 1
3 and the other end of the winding 13 and the other end of the power supply 28 are connected. At this time, the coil 12 generates a magnetic flux 14 and a gap spacer 18 is formed in a magnetic path through which the magnetic flux 14 passes.
To form a normal mode choke coil, and a gap 3 is formed in a magnetic path through which a magnetic flux 15 generated from the winding 13 passes.
The normal mode choke coil is formed by providing the reference numerals 3 and 34.

Therefore, with the above configuration, two normal mode choke coils can be formed by one element, and the noise generated in each line connected to both lines of the circuit can be greatly reduced. When mounted on a circuit, a filter circuit can be formed by adding a capacitor, a resistor, a varistor, and the like between the coils to further reduce noise. Furthermore, cost reduction and man-hour reduction can be achieved by reducing the number of parts. The downsizing can reduce the mounting area, reduce materials, and reduce loss.

Further, the same element was used and the above-mentioned wiring order was changed so that two normal mode choke coils were connected to one line.
It is also possible to arrange them in steps.

(Embodiment 16) A sixteenth embodiment of the present invention will be described with reference to FIGS. FIG.
6 is a perspective view of a finished product of the choke coil according to the sixteenth embodiment, FIG. 57 is a sectional view of the same, FIG. 58 is an exploded perspective view of the essential part, and FIG. 59 is a connection diagram showing the direction of magnetic flux in the normal mode. FIG. 60 is a connection diagram showing the direction of magnetic flux in the common mode, and FIG. 61 is a circuit configuration diagram. According to the drawing, reference numerals 12a and 12b denote first and second coils 13a and 13a wound around the core 10 in the circumferential direction of the core 10.
Reference numeral 13b denotes a first winding and a second winding wound around the outer peripheral surface of the magnetic core 10 through the center hole 11 of the magnetic core 10, and the first and second magnetic cores constituting the magnetic core 10 of the closed magnetic paths 16 and 17. , 14a, 1
4b is a magnetic flux generated by the coils 12a and 12b, respectively.
15a and 15b are magnetic fluxes generated by the windings 13a and 13b, 28 is a power supply, 29 is a load, 30a is a line current, and 30b is a current flowing in the same direction.

The configuration and operation will be described below. Coil 12
a, 12b wound to form a first magnetic core 16 forming a closed magnetic circuit.
, And covered with the second magnetic core 17, and the windings 13a,
13b is wound around the circumference of the magnetic core 10 through the center holes 11 of the first and second magnetic cores 16 and 17. Then, one end of the winding 13a is connected to the power supply 28, the other end of the winding 13a is connected to one end of the coil 12b, and the other end of the coil 12b is connected to the load 29. The other end of the load 29 is connected to one end of the coil 12a, the other end of the coil 12a is connected to one end of the winding 13b, and the other end of the winding 13b is connected to the power supply 2
8 is connected to the other end. At this time, the coils 12a, 12
b indicates that the magnetic fluxes 14a and 14b are offset from the line current 30a, and the magnetic fluxes 14a and 14b are
14b is wound in the direction in which it is added to form a common mode choke coil. And windings 13a, 13b
Also, the magnetic fluxes 15a and 15b are offset from the line current 30a, and the magnetic fluxes 15a and 15b are
5b is wound in the direction to be added to form a common mode choke coil.

Therefore, with the above configuration, two common mode choke coils can be formed by one element, and a common mode choke coil can be formed in two stages of both lines of the circuit, so that common mode noise generated in both lines is greatly reduced. be able to. Also, when mounted on a circuit, a capacitor, a resistor, a varistor, etc. may be added between the coils to form a filter circuit to further reduce noise. Furthermore, cost reduction and man-hour reduction can be achieved by reducing the number of parts. The downsizing can reduce the mounting area, reduce materials, and reduce loss.

It is also possible to arrange the common-mode choke coil by the coils 12a and 12b at the preceding stage and the common-mode choke coil by the windings 13a and 13b at the subsequent stage by changing the wiring order with the same element.

(Embodiment 17) A seventeenth embodiment of the present invention will be described with reference to FIGS. FIG.
2 is a perspective view of a finished product of the choke coil according to the seventeenth embodiment, FIG. 63 is a sectional view of the same, and FIG. 64 is an exploded perspective view of the relevant part. According to the drawing, 12a and 12b are first coils wound in a spiral shape in the circumferential direction of the magnetic core 10 inside the magnetic core 10.
And the second coil, 13a and 13b are the first and second windings wound around the outer peripheral surface of the magnetic core 10 through the center hole 11 of the magnetic core 10, and 16 and 17 are the closed magnetic core 10 Are the first and second magnetic cores.

The structure and operation will be described below. Coil 12
a and 12b are spirally wound, inserted into a first magnetic core 16 constituting a closed magnetic circuit, covered with a second magnetic core 17, and the windings 13a and 13b are passed through the center hole 11 of the magnetic core 10. It is wound around the outer peripheral surface of the magnetic core 10. At this time, the coil 12
a and 12b are wound in a direction in which the magnetic flux is offset with respect to the line current, and the magnetic flux is added with respect to the current in the same direction.
Construct a common mode choke coil. The windings 13a and 13b are also wound in a direction in which the magnetic flux is canceled with respect to the line current, and the magnetic flux is added with respect to the current in the same direction, thereby forming a common mode choke coil.

Therefore, with the above configuration, in addition to the same effect as in the sixteenth embodiment, the distance between the two coils 12a and 12b can be reduced to improve the magnetic coupling, and the leakage inductance in the normal mode is reduced. Therefore, magnetic saturation of the magnetic core can be prevented even when a large current is applied. In addition, since magnetic saturation can be prevented even if the cross-sectional area of the magnetic core is small, downsizing can be achieved, and weight reduction, downsizing of mounting area, reduction of materials, and reduction of loss can be achieved.

Embodiment 18 An eighteenth embodiment of the present invention will be described with reference to FIGS. FIG.
5 is a perspective view of a finished product of the choke coil according to the eighteenth embodiment, FIG. 66 is a sectional view of the same, and FIG. 67 is an exploded perspective view of the essential parts. According to FIG. 1, 12a and 12b are first solenoids wound inside the magnetic core 10 in the circumferential direction of the magnetic core 10.
And the second coil, 13a and 13b are the first and second windings wound around the outer peripheral surface of the magnetic core 10 through the center hole 11 of the magnetic core 10, and 16 and 17 are the closed magnetic core 10 Are the first and second magnetic cores.

The structure and operation will be described below. Coil 12
a and 12b are wound in a solenoid shape, and the two coils 12a and 12b are arranged in a bifilar shape and inserted into a first magnetic core 16 forming a closed magnetic circuit, and a second magnetic core 17 is formed.
And the windings 13a and 13b are connected to the center hole 1 of the magnetic core 10.
1 and wound around the outer peripheral surface of the magnetic core 10. At this time, the magnetic flux of the coils 12a and 12b is offset by the line current,
It is wound in the direction in which the magnetic flux is added to the current in the same direction, and forms a common mode choke coil. And
The windings 13a and 13b are also wound in a direction in which the magnetic flux is canceled with respect to the line current and the magnetic flux is added with respect to the current in the same direction, thereby forming a common mode choke coil.

Therefore, according to the above configuration, in addition to the same effects as in the sixteenth embodiment, the magnetic coupling between the two coils 12a and 12b can be further improved as compared with the seventeenth embodiment, and the leakage inductance in the normal mode can be reduced. Therefore, magnetic saturation of the magnetic core can be prevented even when a large current is applied. In addition, since magnetic saturation can be prevented even if the cross-sectional area of the magnetic core is small, downsizing can be achieved, and weight reduction, downsizing of mounting area, reduction of materials, and reduction of loss can be achieved.

(Embodiment 19) A nineteenth embodiment of the present invention will be described with reference to FIGS. FIG.
8 is a perspective view of a finished product of the choke coil according to the nineteenth embodiment, FIG. 69 is a sectional view of the same, and FIG. 70 is an exploded perspective view of the essential parts. According to the figure, 10 is a magnetic core, 12 is a coil, 13
Is a winding, 16 is a first magnetic core which closes the inner cylinder and the outer cylinder constituting the magnetic core 10 at one end thereof, 35 is a magnetic material different from the first magnetic core 16 constituting the magnetic core, and has an outer diameter of First
Is a plate-shaped second magnetic core constituting a closed magnetic circuit similar to the magnetic core 16 of FIG.

The structure and operation will be described below. The coil 12 wound in advance is inserted into the first magnetic core 16, the coil insertion portion of the first magnetic core 16 is covered by the second magnetic core 35, and the winding 13
Is wound around the outer peripheral surface of the magnetic core 10 through the center holes 11 of the first magnetic core 16 and the second magnetic core 35. That is, the coil 12
The magnetic path from the upper end of the inner cylinder 16a of the first magnetic core 16 to the upper end of the outer cylinder 16b of the first magnetic core 16 in the magnetic path through which the magnetic flux 14 generated by the
A second magnetic core 35 having different characteristics is inserted in parallel into a magnetic path through which a magnetic flux 15 generated by the magnetic field 3 passes.

Therefore, in addition to the same effects as those of the first embodiment, the material, size, and shape of the second magnetic core 35 can be changed to change the inductance value, frequency characteristics, DC superimposed saturation characteristics, and the like. The characteristics can be adjusted.

(Embodiment 20) A twentieth embodiment of the present invention will be described with reference to FIGS. FIG.
1 is a perspective view of a finished product of the choke coil according to the twentieth embodiment, FIG. 72 is a sectional view of the same, and FIG. 73 is an exploded perspective view of the essential parts. According to the figure, 12 is a coil, 13 is a winding, 16
Is a first magnetic core in which the inner cylinder 16a and the outer cylinder 16b constituting the closed magnetic circuit core 10 are closed at one end thereof, and 36 is an inner cylinder 16a of the magnetic core 16 made of a magnetic material different from the magnetic core 16 also constituting the magnetic core 10. And a second magnetic core having a shape that fills a space above the coil 12 between the outer core 16b and the outer cylinder 16b.

The structure and operation will be described below. The coil 12 wound in advance is inserted into the first magnetic core 16, the second magnetic core 36 is inserted into a coil insertion portion between the inner cylinder 16 a and the outer cylinder 16 b of the first magnetic core 16, and the winding 13 is inserted into the magnetic core 16. The core 10 is wound around the outer peripheral surface of the magnetic core 10 through the center hole 11. That is, the first magnetic core 16 is constituted by the second magnetic core 36 having different characteristics in the magnetic path through which the magnetic flux 14 generated by the coil 12 passes from the outer side surface of the inner cylinder 16a to the inner side surface of the outer cylinder 16b. Then, a second magnetic core 36 having different characteristics is inserted in parallel into a magnetic path through which the magnetic flux 15 generated by the winding 13 passes.

Therefore, in addition to the same effects as in the nineteenth embodiment, the magnetic path length by the second magnetic core 36 in the magnetic path through which the magnetic flux 14 passes is shorter than that in the nineteenth embodiment, and The sectional area by the magnetic core 36 is the same as that of the first embodiment.
9 and the second magnetic core 36 according to the nineteenth embodiment
Even if a magnetic material similar to that described above is used, characteristics such as an inductance value, frequency characteristics, and DC superimposed saturation characteristics can be adjusted to characteristics different from those in the nineteenth embodiment. Further, since the second magnetic core 36 is smaller than the second magnetic core 35 in the nineteenth embodiment, it is possible to reduce the amount of material used, the weight of the product, and the cost.

(Embodiment 21) A twenty-first embodiment of the present invention will be described with reference to FIGS. FIG.
4 is a perspective view of a finished product of the choke coil according to the twenty-first embodiment, FIG. 75 is a sectional view of the same, and FIG. 76 is an exploded perspective view of the essential parts. According to the figure, 12 is a coil, 13 is a winding, 1
Reference numerals 6 and 17 denote first and second magnetic cores of the closed magnetic circuit core 10, and 37 denotes a mold resin.

The structure is shown below. Pre-wound coil 1
2 is molded into the same shape as that of the coil insertion portion of the first magnetic core 16 with a mold resin 37, and inserted into the first magnetic core 16 without any gap. Wrap around the outer peripheral surface of No. 10.

Therefore, in addition to the same effects as in the first embodiment,
Since the coil 12 is covered with the mold resin 37, the heat generated from the coil 12 at the time of energization has a higher thermal conductivity to the outside and improves heat dissipation as compared with the case where only the air around the coil 12 is air. Since the diameter of the copper wire of the coil 12 can be reduced, the size of the element can be reduced, so that the mounting area can be reduced, the material can be reduced, and the loss can be reduced.
Further, since the shape of the coil 12 is stabilized by molding with the molding resin 37, characteristics such as stray capacitance are stabilized. Further, since the coil 12 is covered with the resin mold 37, quality deterioration such as film destruction, rare short circuit, corrosion of copper wire, disconnection, etc. is reduced. Further, since the coil 12 is molded by the molding resin 37 and has a fixed shape, the coil 12 can be easily chucked, and the operation of inserting the coil into the first magnetic core 16 is facilitated.

(Embodiment 22) A twenty-second embodiment of the present invention will be described with reference to FIGS. FIG.
7 is a perspective view of a completed product of the choke coil according to the twenty-second embodiment, FIG. 78 is a sectional view of the same, and FIG. 79 is an exploded perspective view of the essential parts. According to the figure, 12 is a coil, 13 is a winding, 1
Reference numerals 6 and 17 denote first and second magnetic cores constituting the closed magnetic circuit core 10, and 38 denotes a casting resin.

The structure is shown below. Pre-wound coil 1
2 is inserted into the first magnetic core 16, a resin 38 is poured between the coil 12 and the first magnetic core 16, the second magnetic core 17 is used to cover the coil insertion portion of the first magnetic core 16, and the winding is performed. The wire 13 is wound around the outer peripheral surface of the magnetic core 10 through the center hole 11 of the magnetic core 10.

Therefore, as in the twenty-first embodiment, the coil 1
2 is covered with the resin 38, the heat generated from the coil 12 at the time of energization has a higher thermal conductivity to the outside and the heat radiation is improved as compared with the case where only the air around the coil 12 is used. Since the diameter of the copper wire 12 can be reduced, the element can be downsized, so that the mounting area can be reduced, the material can be reduced, and the loss can be reduced. Further, since the shape of the coil 12 is stabilized by the resin 38, characteristics such as stray capacitance are stabilized. Further, since the coil 12 is covered with the resin 38, quality deterioration such as film destruction, rare short, corrosion of copper wire, disconnection, etc. is reduced.

Embodiment 23 A twenty-third embodiment of the present invention will be described with reference to FIGS. FIG.
0 is a perspective view of a finished product of the choke coil according to the twenty-third embodiment, FIG. 81 is a sectional view of the same, and FIG. 82 is an exploded perspective view of the essential parts. According to the figure, 12 is a coil, 13 is a winding, 1
Reference numerals 6 and 17 denote magnetic cores constituting the closed magnetic circuit core 10, and 39 denotes a ferrite resin.

The structure is shown below. Pre-wound coil 1
2 around the first magnetic core 16 by the ferrite resin 39.
Of the same shape as the coil insertion portion of the first magnetic core 16
The winding 13 is inserted into the center hole 11 of the magnetic core 10 without any gap.
And wound around the outer peripheral surface of the magnetic core 10.

Therefore, in addition to the same effects as in the twenty-first embodiment, a magnetic core can be formed between the coil 12 and the magnetic core 10 in the magnetic path, so that a large inductance value and magnetic saturation characteristics can be obtained even with a small size. In addition, by changing the material and dimensions of the ferrite resin 39, characteristics such as an inductance value, a frequency characteristic, and a DC superimposed saturation characteristic can be adjusted.

(Twenty-fourth Embodiment) A twenty-fourth embodiment of the present invention will be described with reference to FIGS. FIG.
3 is a perspective view of a finished product of the choke coil according to the twenty-fourth embodiment, FIG. 84 is a sectional view of the same, and FIG. 85 is an exploded perspective view of the essential parts. According to the drawing, reference numeral 40 denotes a coil obtained by winding a flat wire in an edgewise manner, 13 denotes a winding, and 16 and 17 denote closed magnetic cores 1.
0 are the first and second magnetic cores.

The structure is shown below. Pre-wound coil 4
0 is inserted into the first magnetic core 16, and the winding 13 is wound around the outer peripheral surface of the magnetic core 10 through the center hole 11 of the magnetic core 10.

Therefore, in addition to the same effects as in the first embodiment,
The coil 40 formed by winding a rectangular wire has an improved area factor and a smaller element as compared with a coil formed by winding a round wire, and at the same time, improves the heat dissipation of the coil 40 and cuts the copper wire. The area can be reduced, and downsizing, cost reduction, mounting area downsizing, material reduction, and loss reduction can be achieved. Further, since the opposing area between the coil 40 and the magnetic core 10 is small and the stray capacitance is small, it is possible to prevent the noise attenuation characteristics from being deteriorated in a high frequency range.

Embodiment 25 A twenty-fifth embodiment of the present invention will be described with reference to FIGS. FIG.
6 is a perspective view of a finished product of the choke coil according to the twenty-fifth embodiment, FIG. 87 is a sectional view of the same, and FIG. 88 is an exploded perspective view of the essential parts. According to the drawing, reference numeral 41 denotes a coil formed by winding a rectangular wire flatwise, reference numeral 13 denotes a winding, and reference numerals 16 and 17 denote first and second magnetic cores constituting the closed magnetic circuit core 10.

The structure is shown below. Pre-wound coil 4
1 is inserted into the first magnetic core 16, and the winding 13 is wound around the outer peripheral surface of the magnetic core 10 through the center hole 11 of the magnetic core 10.

Therefore, in addition to the same effect as in the twenty-fourth embodiment, the coil 41 can be wound with a lower height than in the twenty-third embodiment by winding the flat wire in a flat-wise manner. Can be lowered.

(Twenty-Sixth Embodiment) A twenty-sixth embodiment of the present invention will be described with reference to FIGS. FIG.
9 is a perspective view of a finished product of the choke coil according to the twenty-sixth embodiment, FIG. 90 is a sectional view of the same, and FIG. 91 is an exploded perspective view of the essential parts. According to the figure, reference numeral 42 denotes a coil formed by winding a rectangular wire edgewise on the same plane, 13 denotes a winding, and 16 and 17 denote first and second magnetic cores constituting the closed magnetic core 10.

The structure is shown below. Pre-wound coil 4
2 is inserted into the first magnetic core 16, and the winding 13 is wound around the outer peripheral surface of the magnetic core 10 through the center hole 11 of the magnetic core 10.

Therefore, in addition to the effect similar to that of the twenty-third embodiment, the coil 42 can be further wound lower than that of the twenty-fifth embodiment by winding the rectangular wire edgewise on the same plane. And the product height can be reduced.

(Twenty-Seventh Embodiment) A twenty-seventh embodiment of the present invention will be described with reference to FIGS. FIG.
2 is a perspective view of a finished product of the choke coil according to the twenty-seventh embodiment, FIG. 93 is a sectional view of the same, and FIG. 94 is an exploded perspective view of the essential parts. According to the figure, reference numerals 42a and 42b denote coils obtained by winding a rectangular wire edgewise on the same plane;
Reference numerals 1 and 32 denote gaps 33 and 3 constituting the closed magnetic core 10.
4 are first and second magnetic cores.

The configuration and operation will be described below. Pre-wound 2
The coils 42a and 42b are arranged on the same
The winding 13 is inserted into the center hole 11 of the magnetic core 10.
And wound around the outer peripheral surface of the magnetic core 10. At this time, coil 4
The magnetic fluxes 2a and 42b are generated in such a manner that the magnetic fluxes respectively generated with respect to the line current are canceled and the magnetic fluxes are added to the current in the same direction, thereby forming a common mode choke coil. The winding 13 generates a magnetic flux in a direction in which the first and second magnetic cores 31 and 32 having the gaps 33 and 34 rotate in the circumferential direction, thereby forming a normal mode choke coil.

Therefore, in addition to the same effects as in the twelfth embodiment, the coils 42a and 42b are further wound lower than in the twelfth embodiment by winding the flat wire edgewise on the same plane. And the product height can be reduced.

(Embodiment 28) A twenty-eighth embodiment of the present invention will be described with reference to FIGS. FIG.
5 is a perspective view of a completed product of the choke coil according to the twenty-eighth embodiment, FIG. 96 is a sectional view of the same, and FIG. 97 is an exploded perspective view of the essential parts. According to the drawing, reference numeral 43 denotes a coil wound with a foil metal, reference numeral 13 denotes a winding, and reference numerals 16 and 17 denote first and second cores constituting the closed magnetic circuit core 10.

The structure is shown below. Pre-wound coil 4
3 is inserted into the first magnetic core 16, and the winding 13 is wound around the outer peripheral surface of the magnetic core 10 through the center hole 11 of the magnetic core 10.

Therefore, in addition to the same effects as in the first embodiment,
The following effects can be achieved by winding the foil metal.

As the linear area ratio is improved and the size of the device can be reduced, the cost can be reduced and the mounting area can be reduced.
Material can be reduced.

The heat radiation of the coil 43 is improved, the cross-sectional area of the copper wire can be reduced, and the size, cost, mounting area, material, and loss can be reduced.

Since the surface area is large and the thickness is small, the eddy current loss due to the skin effect can be reduced, and the copper loss can be reduced even when a high-frequency current is applied.

When the two coils are wound in a bifilar shape, the magnetic coupling between the two coils can be improved, and the leakage inductance in the normal mode is reduced. Saturation can be prevented, so even if the cross-sectional area of the magnetic core is small, magnetic saturation can be prevented.
The mounting area can be reduced in size, material can be reduced, and loss can be reduced.

(Embodiment 29) A twenty-ninth embodiment of the present invention will be described with reference to FIGS. FIG. 98 is a perspective view of a completed product of the choke coil according to the twenty-ninth embodiment, FIG. 99 is a sectional view of the same, and FIG. 100 is an exploded perspective view of the essential parts. According to the drawing, 43a and 43b are coils wound with a foil metal, 13 is a winding, and 31 and 32 are first and second provided with gaps 33 and 34 constituting the closed magnetic circuit core 10.
It is a magnetic core.

The structure and operation will be described below. A coil 43a wound in advance and a coil 43b wound with an inner diameter larger than the coil 43a are arranged in a bifilar shape, and the first magnetic core 3
1, the winding 13 is wound around the outer peripheral surface of the magnetic core 10 through the center hole 11 of the magnetic core 10. At this time, the coils 43a, 4
3b is wound in a direction in which the magnetic flux is canceled with respect to the line current, and the magnetic flux is added with respect to the current in the same direction, thereby forming a common mode choke coil.

Therefore, in addition to the same effect as in the eleventh embodiment in which a coil is wound using a round wire to form a common mode choke coil, the same effect as in the twenty-seventh embodiment is obtained by winding a foil metal. Can be

(Embodiment 30) A thirtieth embodiment of the present invention will be described with reference to FIGS.
FIG. 101 is a perspective view of a finished product of the choke coil according to the thirtieth embodiment, and FIG. 102 is a sectional view of the same. According to the drawing, reference numeral 12 denotes a coil wound inside the magnetic core 10 in the circumferential direction of the magnetic core 10, and 13 denotes a coil passing through the center hole 11 of the magnetic core 10.
Is a magnetic core having a circular shape in the circumferential direction and a rectangular cross section.

The configuration is shown below. The coil 12 is housed in the circular magnetic core 10 in the circumferential direction, and the winding 13 is wound around the outer peripheral surface of the magnetic core 10 through the center hole 11 of the magnetic core 10.

Therefore, in addition to the same effects as in the first embodiment,
By using the magnetic core 10 having a circular shape, the loss of the magnetic flux passing through the magnetic path by the winding 13 can be eliminated, a large effective magnetic permeability can be obtained, and a large inductance value can be obtained even with a small magnetic core. Costs can be reduced. Furthermore, since the leakage flux of the magnetic flux generated by the winding 13 is reduced, the influence on other components during circuit mounting can be reduced.

(Thirty-First Embodiment) A thirty-first embodiment of the present invention will be described with reference to FIGS.
FIG. 103 is a perspective view of a finished product of the choke coil of the thirty-first embodiment, and FIG. 104 is a sectional view of the same. According to the drawing, reference numeral 12 denotes a coil wound inside the magnetic core 10 in the circumferential direction of the magnetic core 10, and 13 denotes a coil passing through the center hole 11 of the magnetic core 10.
Is a magnetic core having a circular shape in the circumferential direction and a circular cross section.

The structure is shown below. The coil 12 is housed in the circular magnetic core 10 in the circumferential direction, and the winding 13 is wound around the outer peripheral surface of the magnetic core 10 through the center hole 11 of the magnetic core 10.

Therefore, in addition to the same effects as in the thirty-third embodiment, the use of a magnetic core having a circular cross section shortens the length of use of the winding 13 and reduces the amount of heat generated at the time of energization. By reducing the diameter and the size of the product, it is possible to reduce the weight, the mounting area, the materials used, and the loss such as copper loss. Furthermore, in addition to the reduction of the leakage flux of the magnetic flux generated by the winding 13,
Since the leakage magnetic flux of the magnetic flux generated by the coil 12 is reduced, the influence on other components during circuit mounting can be reduced.

(Embodiment 32) A thirty-second embodiment of the present invention will be described with reference to FIGS.
FIG. 105 is a perspective view of a completed product of the choke coil according to the thirty-second embodiment, and FIG. 106 is an exploded perspective view of the main part. According to the drawing, reference numeral 12 denotes a coil wound inside the magnetic core 10 in the circumferential direction of the magnetic core 10, reference numeral 13 denotes a winding wound around the outer peripheral surface of the magnetic core 10 through the center hole 11 of the magnetic core 10, and reference numeral 44 denotes a circle. This is a magnetic core obtained by dividing a closed magnetic circuit core 10 having a circular shape in the circumferential direction into a U-shaped butt-type magnetic core.

The structure is shown below. Pre-wound winding 13
Then, the coil 12 is fed into the groove of the combination of the magnetic cores 44 and wound.

Therefore, in addition to the same effect as in the thirtieth embodiment, the choke coil can be formed by winding the winding 13 in advance and inserting the divided magnetic core 44, so that the winding process is simplified and the cost can be reduced. .

(Thirty-third Embodiment) A thirty-third embodiment of the present invention will be described with reference to FIGS.
FIG. 107 is a perspective view of a finished product of the choke coil according to the thirty-third embodiment, and FIG. 108 is an exploded perspective view of the main part. According to the drawing, reference numeral 12 denotes a coil wound inside the magnetic core 10 in the circumferential direction of the magnetic core 10, 13 denotes a winding obtained by winding a rectangular wire through the center hole 11 of the magnetic core 10 and the outer peripheral surface of the magnetic core 10, 44 Is a magnetic core obtained by dividing the closed magnetic circuit core 10 having a circular shape in the circumferential direction into a U-shaped butt-type magnetic core.

The configuration is shown below. The winding 13 is wound in advance in a solenoid shape and bent in an arc shape to insert the circular U-shaped butt-shaped magnetic core 44, and the coil 12 is provided in the magnetic core 10 combined with the magnetic core 44 on the outer peripheral surface of the magnetic core 10. A wire is inserted from 45 and wound.

Therefore, in addition to the same effects as in the thirty-second embodiment, the winding of the winding 13 with a flat wire makes it easier to bend into an arc shape as compared with the winding of a round wire. Can be simplified. Further, since the stress applied to the flat wire is smaller than that of the round wire when the winding 13 is bent into an arc shape, the quality is less deteriorated.

(Embodiment 34) A thirty-fourth embodiment of the present invention will be described with reference to FIGS.
FIG. 109 is a perspective view of a completed product of the choke coil according to the thirty-fourth embodiment, and FIG. 110 is an exploded perspective view showing a method of inserting the coil. According to the drawing, 12 is a coil, 13 is a winding wound around the outer peripheral surface of the magnetic core 10 through the center hole 11 of the magnetic core 10, and 44 is a closed magnetic circuit core 1 having a circular shape in the circumferential direction.
0 is a magnetic core divided into a U-shaped butted magnetic core.

The structure is shown below. Insert the divided magnetic core 44 into the pre-wound winding 13, insert one end of the pre-wound coil 12 into a part of the coil accommodating portion of the magnetic core 10, and spirally rotate the coil 12 into the magnetic core 10. Insert.

Therefore, in addition to the same effects as in the thirty-second embodiment, the coil 12 can be wound in advance outside the magnetic core 10, so that the winding process is simplified and the cost can be reduced.

Further, the magnetic core 10 is constituted by a continuous closed magnetic circuit core having no cut portion, and the winding 13 is wound around the outer peripheral surface of the magnetic core 10. Then, one end of the coil 12 previously wound in the same manner as described above is connected to the magnetic core 10. Similar effects can be obtained by inserting the coil 12 into the magnetic core 10 by inserting it into a part of the coil housing 10 and spirally rotating the coil 12.

(Thirty-Fifth Embodiment) A thirty-fifth embodiment of the present invention will be described with reference to FIGS.
FIG. 111 is a perspective view of a finished product of the choke coil according to the thirty-fifth embodiment, and FIG. 112 is a sectional view of the same. According to the drawing, reference numeral 12 denotes a coil wound inside the magnetic core 10 in the circumferential direction of the magnetic core 10, and 13 denotes a coil passing through the center hole 11 of the magnetic core 10.
Is a magnetic core having a rectangular shape and a rectangular cross-sectional shape.

The configuration is shown below. The coil 12 is housed in the rectangular magnetic core 10 in the circumferential direction, and the winding 13 is wound around the outer peripheral surface of the magnetic core 10 through the center hole 11 of the magnetic core 10.

Therefore, in addition to the same effects as in the first embodiment,
The use of the rectangular magnetic core 10 allows the winding 13 to be wound in a solenoid shape, thereby improving the linearity and reducing the size, and also facilitating the winding process and reducing the cost.
Furthermore, even when the winding 13 is wound after the closed magnetic circuit core 10 is formed, the winding method is easier than when the magnetic core 10 is circular.

(Embodiment 36) A thirty-sixth embodiment of the present invention will be described with reference to FIGS.
FIG. 113 is a perspective view of a completed product of the choke coil according to the thirty-sixth embodiment, and FIG. 114 is a sectional view of the same. According to the drawing, reference numeral 12 denotes a coil wound inside the magnetic core 10 in the circumferential direction of the magnetic core 10, and 13 denotes a coil passing through the center hole 11 of the magnetic core 10.
Is a magnetic core having a square shape and a circular cross section.

The configuration is shown below. The coil 12 is housed in the rectangular magnetic core 10, and the winding 13 a is provided in the center hole 1 of the magnetic core 10.
1 and wound around the outer peripheral surface of the magnetic core 10.

Therefore, in addition to the same effects as in the thirty-seventh embodiment, by using the magnetic core 10 having a circular cross section,
Since the length of use of the winding 13 is shortened and the amount of heat generated upon energization is reduced, the copper wire diameter is reduced to reduce the size of the product, thereby reducing weight, mounting area, and materials used.
Loss such as copper loss can be reduced. Further, since the leakage magnetic flux of the magnetic flux generated by the coil 12 is reduced, the influence on other components during circuit mounting can be reduced.

(Embodiment 37) A thirty-seventh embodiment of the present invention will be described with reference to FIGS.
FIG. 115 is a perspective view of a finished product of the choke coil of the 37th embodiment, and FIG. 116 is a sectional view of the same. According to the drawing, reference numeral 12 denotes a coil wound inside the magnetic core 10 in the circumferential direction of the magnetic core 10, 13 denotes a winding obtained by winding a flat wire through the center hole 11 of the magnetic core 10 and on the outer peripheral surface of the magnetic core 10, The shape is square,
The magnetic core has a circular cross section.

The structure is shown below. The coil 12 is housed in the square magnetic core 10,
It is wound around the outer peripheral surface of the magnetic core 10 through the center hole 11 of zero.

Therefore, in addition to the same effect as in the thirty-sixth embodiment, by forming the shape of the magnetic core 10 into a quadrangle, the winding 13 wound on the magnetic core 10 is formed into a rectangular shape in addition to the same effect as in the first embodiment. The wire can be wound in a solenoid shape, so that the wire area ratio can be improved, the size can be reduced, and the winding process can be simplified and the cost can be reduced.

(Embodiment 38) A thirty-eighth embodiment of the present invention will be described with reference to FIGS.
117 is a perspective view of a finished product of the choke coil according to the thirty-eighth embodiment, FIG. 118 is a cross-sectional view of the same, FIG. 119 is an exploded perspective view of the main part, and FIG. FIG. 121 is a connection diagram showing the direction of magnetic flux in the common mode, and FIG. 122 is a circuit configuration diagram. According to the figure, 12a, 12b, 12c are first coils wound in the circumferential direction of the magnetic core 10 inside the magnetic core 10,
2nd coil and 3rd coil, 13a, 13b, 13c
Are a first winding, a second winding and a third winding, 16 and 1 wound around the outer peripheral surface of the magnetic core 10 through the center hole 11 of the magnetic core 10.
Reference numeral 7 denotes first and second magnetic cores constituting the closed magnetic circuit core 10;
a and 14b are magnetic fluxes generated by the coils 12a and 12b, respectively, and 15a, 15b and 15c are windings 13a and 13c, respectively.
b, 13c, 28 is a three-phase power supply, 29
Is a three-phase load, 30a is a line power supply, and 30b is a current flowing in the same direction.

The configuration and operation will be described below. Coil 12
a, 12b, and 12c are wound, inserted into a first magnetic core 16 constituting a closed magnetic circuit, covered with a second magnetic core 17, and the windings 13a, 13b, and 13c are inserted into the center hole 11 of the magnetic core 10. It is wound around the outer peripheral surface of the magnetic core 10. And three coils 1
2a, 12b, 12c and three windings 13a, 13b, 1
3c, one end of the power supply 28 and one end of the coil, the other end of the coil and one end of the winding, and the other end of the winding and one end of the load. At this time, the magnetic fluxes 14a and 14b are canceled by the coils 12a and 12b with respect to the line current 30a, and the magnetic fluxes 14a and 14b with respect to the current 30b in the same direction.
Are wound in a direction in which the common mode choke coil is added. The windings 13a and 13b also cancel out the magnetic fluxes 15a and 15b with respect to the line current 30a,
It is wound in the direction in which the magnetic fluxes 15a and 15b are added to the current 30b in the same direction, and forms a common mode choke coil. Also, the coils 12b and 12c, 12c and 12a, and the windings 13b and 13c, and 13c and 13a are also wound in a direction in which the magnetic flux is canceled by the line current and the magnetic flux is added to the current in the same direction. Construct a common mode choke coil.

Therefore, with the above-described configuration, two types of common mode choke coils corresponding to a three-phase circuit can be formed with one element, and a common mode choke coil can be formed in two stages in each line of the circuit. Common mode noise can be greatly reduced. When mounted on a circuit, a filter circuit can be formed by adding a capacitor, a resistor, a varistor, and the like between the coils to further reduce noise. Furthermore, cost reduction and man-hour reduction can be achieved by reducing the number of parts. The downsizing can reduce the mounting area, reduce materials, and reduce loss.

Also, by changing the wiring order with the same elements, the common mode choke coil composed of the coils 12a, 12b, and 12c may be arranged at the preceding stage, and the common mode choke coil composed of the windings 13a, 13b, and 13c may be arranged at the latter stage. It is possible.

(Embodiment 39) A thirty-ninth embodiment of the present invention will be described with reference to FIGS.
FIG. 123 is a perspective view of a completed product of the choke coil according to the thirty-ninth embodiment, FIG. 124 is a sectional view of the same, and FIG. 125 is an exploded perspective view of the principal part. According to the figure, 12a, 12b, 12
c is a first coil, a second coil and a third coil spirally wound in the circumferential direction of the magnetic core 10 inside the magnetic core 10, and 13a, 13b, 13c are central holes 11 of the magnetic core 10.
, The first winding wound around the outer peripheral surface of the magnetic core 10, the second winding
And third and fourth windings 16 and 17 are first and second cores constituting the closed magnetic circuit core 10.

The configuration and operation will be described below. Coil 12
a, 12b, and 12c are spirally wound and inserted into a first magnetic core 16 forming a closed magnetic circuit, and a second magnetic core 17
Then, the windings 13a, 13b, 13c are wound around the outer peripheral surface of the magnetic core 10 through the center hole 11 of the magnetic core 10. At this time, the coils 12a and 12b and the coils 12b and 12c are wound in a direction in which the magnetic flux is canceled with respect to the line current and the magnetic flux is added with respect to the current in the same direction, thereby forming a three-phase common mode choke coil. . And windings 13a and 13
Also, b, 13b and 13c, and 13c and 13a are wound in a direction in which the magnetic flux is canceled with respect to the line current and the magnetic flux is added with respect to the current in the same direction, thereby forming a three-phase common mode choke coil.

Therefore, with the above configuration, in addition to the same effects as in the thirty-eighth embodiment, the distance between the three coils 12a to 12c can be reduced to improve the magnetic coupling, and the leakage inductance in the normal mode is reduced. Therefore, magnetic saturation of the magnetic core 10 can be prevented even when a large current is applied. In addition, since magnetic saturation can be prevented even if the cross-sectional area of the magnetic core 10 is small, the size can be reduced, and the weight can be reduced.
The mounting area can be reduced in size, material can be reduced, and loss can be reduced.

(Embodiment 40) A fortieth embodiment of the present invention will be described with reference to FIGS.
FIG. 126 is a perspective view of a finished product of the choke coil according to the fortieth embodiment, FIG. 127 is a sectional view of the same, and FIG. 128 is an exploded perspective view of the essential parts. According to the figure, 12a, 12b, 12
c is a first coil wound around the magnetic core 10 in the circumferential direction of the magnetic core 10, second and third coils, 13 a, 13 b, and 13 c are central holes 11 of the magnetic core 10.
, The first winding wound around the outer peripheral surface of the magnetic core 10, the second winding
And third and fourth windings 16 and 17 are first and second cores constituting the closed magnetic circuit core 10.

The structure and operation will be described below. Coil 12
a, 12b, and 12c are wound in a solenoid shape, and the three coils 12a to 12c are arranged in a bifilar shape, inserted into a first magnetic core 16 constituting a closed magnetic circuit, and covered with a second magnetic core 17. The windings 13a, 13b, 13c are wound around the outer peripheral surface of the magnetic core 10 through the center hole 11 of the magnetic core 10.
At this time, the coils 12a and 12b, 12b and 12c, 12
c and 12a each have a magnetic flux offset with respect to the line current,
It is wound in the direction in which the magnetic flux is added to the current in the same direction to form a three-phase common mode choke coil. Then, the windings 13a and 13b, 13b and 13c, and 13c and 13a are also wound in directions in which the magnetic flux is canceled with respect to the line current and the magnetic flux is added with respect to the current in the same direction.
A three-phase common mode choke coil is configured.

Therefore, with the above configuration, in addition to the same effects as in the thirty-eighth embodiment, the magnetic coupling between the three coils 12a to 12c can be further improved as compared with the thirty-ninth embodiment, and the leakage inductance in the normal mode can be reduced. Therefore, magnetic saturation of the magnetic core 10 can be prevented even when a large current is applied. In addition, since magnetic saturation can be prevented even if the cross-sectional area of the magnetic core 10 is small, downsizing can be achieved, and weight reduction, downsizing of mounting area, reduction of materials, and reduction of loss can be achieved.

[0197]

As described above, in the choke coil according to the present invention, the coil is wound inside the magnetic core in the circumferential direction of the magnetic core, and the winding is wound around the outer peripheral surface of the magnetic core through the center hole of the magnetic core. With the configuration in which the generated magnetic flux and the magnetic flux generated by the winding are orthogonal, two choke coils can be configured with one element even with only one coil, one winding, and one magnetic core, and the number of parts reduces the cost. And the number of steps can be reduced. In addition, the downsizing can reduce the mounting area, reduce materials, and reduce loss.

[Brief description of the drawings]

FIG. 1 is a perspective view of a choke coil according to an embodiment of the present invention.

FIG. 2 is a sectional view of the embodiment.

FIG. 3 is a plan view of the embodiment.

FIG. 4 is a perspective view of the second embodiment.

FIG. 5 is a sectional view of the embodiment.

FIG. 6 is an exploded perspective view of a main part of the embodiment.

FIG. 7 is a perspective view of the third embodiment.

FIG. 8 is a sectional view of the embodiment.

FIG. 9 is an exploded perspective view of a main part of the embodiment.

FIG. 10 is a perspective view of the fourth embodiment.

FIG. 11 is a sectional view of the embodiment.

FIG. 12 is an exploded perspective view of a main part of the embodiment.

FIG. 13 is a perspective view of the fifth embodiment.

FIG. 14 is a sectional view of the embodiment.

FIG. 15 is an exploded perspective view of a main part of the embodiment.

FIG. 16 is a perspective view of the sixth embodiment.

FIG. 17 is a sectional view of the embodiment.

FIG. 18 is an exploded perspective view of a main part of the embodiment.

FIG. 19 is a perspective view of the seventh embodiment.

FIG. 20 is a sectional view of the embodiment.

FIG. 21 is an exploded perspective view of a main part of the embodiment.

FIG. 22 is a perspective view of the eighth embodiment.

FIG. 23 is a sectional view of the embodiment.

FIG. 24 is an exploded perspective view of a main part of the embodiment.

FIG. 25 is a perspective view of the ninth embodiment.

FIG. 26 is a sectional view of the embodiment.

FIG. 27 is an exploded perspective view of a main part of the embodiment.

FIG. 28 is a perspective view of the tenth embodiment.

FIG. 29 is a sectional view of the embodiment.

FIG. 30 is an exploded perspective view of a main part of the embodiment.

FIG. 31 is a perspective view of the eleventh embodiment.

FIG. 32 is a sectional view of the embodiment.

FIG. 33 is an exploded perspective view of a main part of the embodiment.

FIG. 34 is a wiring diagram of the embodiment.

FIG. 35 is a connection diagram of the embodiment.

FIG. 36 is a circuit configuration diagram of the embodiment.

FIG. 37 is a frequency characteristic diagram of impedance according to the embodiment.

FIG. 38 is a noise measurement data diagram of the embodiment.

FIG. 39 is a perspective view of the twelfth embodiment.

FIG. 40 is a sectional view of the embodiment.

FIG. 41 is an exploded perspective view of a main part of the embodiment.

FIG. 42 is a connection diagram of the embodiment.

FIG. 43 is a connection diagram of the embodiment.

FIG. 44 is a circuit configuration diagram of the embodiment.

FIG. 45 is a perspective view of the thirteenth embodiment.

FIG. 46 is a sectional view of the embodiment.

FIG. 47 is an exploded perspective view of a main part of the embodiment.

FIG. 48 is a perspective view of the fourteenth embodiment.

FIG. 49 is a sectional view of the embodiment.

FIG. 50 is an exploded perspective view of a main part of the embodiment.

FIG. 51 is a perspective view of the fifteenth embodiment;

FIG. 52 is a sectional view of the embodiment;

FIG. 53 is an exploded perspective view of a main part of the embodiment.

FIG. 54 is a wiring diagram of the embodiment.

FIG. 55 is a circuit configuration diagram of the embodiment;

FIG. 56 is a perspective view of the sixteenth embodiment.

FIG. 57 is a sectional view of the embodiment.

FIG. 58 is an exploded perspective view of a main part of the embodiment.

FIG. 59 is a connection diagram of the embodiment.

FIG. 60 is a wiring diagram of the embodiment.

FIG. 61 is a circuit configuration diagram of the embodiment.

FIG. 62 is a perspective view of the seventeenth embodiment.

FIG. 63 is a sectional view of the embodiment.

FIG. 64 is an exploded perspective view of a main part of the embodiment.

FIG. 65 is a perspective view of the eighteenth embodiment.

FIG. 66 is a sectional view of the embodiment;

FIG. 67 is an exploded perspective view of a main part of the embodiment.

FIG. 68 is a perspective view of the nineteenth embodiment.

FIG. 69 is a sectional view of the embodiment;

FIG. 70 is an exploded perspective view of a main part of the embodiment.

FIG. 71 is a perspective view of the twentieth embodiment.

FIG. 72 is a sectional view of the embodiment;

FIG. 73 is an exploded perspective view of a main part of the embodiment.

FIG. 74 is a perspective view of the twenty-first embodiment.

FIG. 75 is a sectional view of the embodiment;

FIG. 76 is an exploded perspective view of a main part of the embodiment.

FIG. 77 is a perspective view of the twenty-second embodiment.

FIG. 78 is a sectional view of the embodiment;

FIG. 79 is an exploded perspective view of a main part of the embodiment.

FIG. 80 is a perspective view of the twenty-third embodiment.

FIG. 81 is a sectional view of the embodiment;

FIG. 82 is an exploded perspective view of a main part of the embodiment.

FIG. 83 is a perspective view of the twenty-fourth embodiment;

FIG. 84 is a sectional view of the embodiment;

FIG. 85 is an exploded perspective view of a main part of the embodiment.

FIG. 86 is a perspective view of the twenty-fifth embodiment.

FIG. 87 is a sectional view of the embodiment;

FIG. 88 is an exploded perspective view of a main part of the embodiment.

FIG. 89 is a perspective view of the twenty-sixth embodiment.

FIG. 90 is a sectional view of the embodiment;

FIG. 91 is an exploded perspective view of a main part of the embodiment.

FIG. 92 is a perspective view of the twenty-seventh embodiment.

FIG. 93 is a sectional view of the embodiment;

FIG. 94 is an exploded perspective view of a main part of the embodiment.

FIG. 95 is a perspective view of the twenty-eighth embodiment.

FIG. 96 is a sectional view of the embodiment;

FIG. 97 is an exploded perspective view of a main part of the embodiment.

FIG. 98 is a perspective view of the twenty-ninth embodiment.

FIG. 99 is a sectional view of the embodiment;

FIG. 100 is an exploded perspective view of a main part of the embodiment.

FIG. 101 is a perspective view of a thirtieth embodiment.

FIG. 102 is a sectional view of the embodiment;

FIG. 103 is a perspective view of the 31st embodiment;

FIG. 104 is a sectional view of the embodiment;

FIG. 105 is a perspective view of the 32nd embodiment.

FIG. 106 is an exploded perspective view of a main part of the embodiment.

FIG. 107 is a perspective view of the thirty-third embodiment.

FIG. 108 is an exploded perspective view of a main part of the embodiment.

FIG. 109 is a perspective view of the thirty-fourth embodiment.

FIG. 110 is an exploded perspective view of a main part of the embodiment.

FIG. 111 is a perspective view of the thirty-fifth embodiment.

FIG. 112 is a sectional view of the embodiment;

FIG. 113 is a perspective view of the thirty-sixth embodiment.

FIG. 114 is a sectional view of the embodiment;

FIG. 115 is a perspective view of the thirty-seventh embodiment.

FIG. 116 is a sectional view of the embodiment;

FIG. 117 is a perspective view of the thirty-eighth embodiment.

FIG. 118 is a sectional view of the embodiment;

FIG. 119 is an exploded perspective view of a main part of the embodiment.

FIG. 120 is a connection diagram of the embodiment.

FIG. 121 is a connection diagram of the embodiment;

FIG. 122 is a circuit diagram of the embodiment;

Fig. 123 is a perspective view of the thirty-ninth embodiment.

FIG. 124 is a sectional view of the embodiment;

FIG. 125 is an exploded perspective view of a main part of the embodiment.

Fig. 126 is a perspective view of the fortieth embodiment.

FIG. 127 is a sectional view of the embodiment;

FIG. 128 is an exploded perspective view of a main part of the embodiment.

FIG. 129 is a perspective view of a conventional choke coil.

FIG. 130 is an exploded perspective view of a conventional choke coil.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Magnetic core 11 Center hole 12, 12a, 12b, 12c, 40, 41, 42, 4
2a, 42b, 43, 43a, 43b Coils 13, 13a, 13b, 13c Windings 14, 14a, 14b Magnetic fluxes generated by coils 15, 15a, 15b, 15c Magnetic fluxes generated by windings 16, 31, First magnetic core 17 , 32, 35, 36 Second magnetic core 18, 22 Gap spacer 19, 20, 21, 25 Spatial gap 23, 24 Cylindrical magnetic core 26, 27 Winding core 28 Power supply 29 Load 30a Line current 30b Current flowing in the same direction 33, 34 Gap 37 Mold resin 38 Resin for casting 39 Ferrite resin 44 Divided magnetic core 45 Hole

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) H01F 27/24 H01F 27/24 JHF term (reference) 5E070 AA01 AB01 BA06 BA14 BA15 BB01 BB03 BB10 CA02 CA04 CA12 CA14 CA16 CA20 DA11 DA13 DB08

Claims (50)

[Claims] A center hole provided in the center of a closed magnetic circuit core having a storage portion containing a coil, and a magnetic flux orthogonal to a magnetic flux generated by the coil is generated on a peripheral surface of the closed magnetic circuit core; A choke coil formed by winding a coil. 2. The choke coil according to claim 1, wherein the external shape of the closed magnetic circuit core is ring-shaped. 3. The choke coil according to claim 1, wherein the external shape of the closed magnetic circuit core is a square frame. 4. The choke coil according to claim 2, wherein a cross section of the magnetic leg of the closed magnetic circuit core is square. 5. The choke coil according to claim 2, wherein the magnetic leg of the closed magnetic path core has a circular cross section. 6. A core with a core having a groove as a storage portion for storing a coil between a core having a center hole as a closed magnetic core and a peripheral wall, and a plate-shaped core having a center hole in the center. The choke coil according to claim 1, wherein the choke coil is configured. 7. The choke coil according to claim 6, wherein the cored core and the plate-shaped core are made of materials having different magnetic properties. 8. The choke coil according to claim 6, wherein one of the core or the peripheral wall of the core with a core is higher than the other. 9. A magnetic core with a core having a groove as a storage portion for storing a coil between a core having a center hole as a closed magnetic path core and a peripheral wall, and the groove is used as a magnetic gap. The choke coil described in the above. 10. The choke coil according to claim 6, wherein the depth of the storage portion in which the coil is incorporated as the closed magnetic circuit core is greater than the height of the coil. 11. The choke coil according to claim 9, wherein one of the core or the peripheral wall of the core with a core is higher than the coil height and the other is lower than the coil height. 12. A core with a core having a groove as a storage portion for storing a coil between a core having a center hole as a closed magnetic core and a peripheral wall, and fitted into an upper portion of the groove of the core with the core. 2. The choke coil according to claim 1, wherein the choke coil comprises a matching ring-shaped magnetic core. 13. The choke coil according to claim 12, wherein the cored core and the ring-shaped core are made of materials having different magnetic properties. 14. The magnetic core according to claim 2, wherein the magnetic core is divided into two parts.
Or the choke coil according to 3 or 6 or 10. 15. The choke coil according to claim 14, wherein the magnetic core divided into two is fixed by a spring. 16. The choke coil according to claim 1, wherein a slit as a magnetic gap is formed in a part of the magnetic leg of the closed magnetic circuit core. 17. The choke coil according to claim 16, wherein a copper wire is fed from a slit as a magnetic gap to wind the coil. 18. The choke coil according to claim 1, wherein the closed magnetic circuit core is constituted by two magnetic cores, and a gap spacer is interposed at a joint surface thereof. 19. The choke coil according to claim 1, wherein the coil incorporated in the closed magnetic circuit core is spirally wound. 20. The choke coil according to claim 1, wherein the coil incorporated in the magnetic core of the closed magnetic path is formed by solenoid winding. 21. The choke coil according to claim 1, wherein the coil incorporated in the closed magnetic core is resin-molded. 22. The choke coil according to claim 21, wherein the coil incorporated in the closed magnetic circuit core is molded with a ferrite resin. 23. The choke coil according to claim 1, wherein the coil housed in the storage section of the closed magnetic circuit core is held by a resin cast into the storage section. 24. The choke coil according to claim 1, wherein the coil incorporated in the magnetic core of the closed magnetic path is configured to be wound edgewise using a rectangular wire. 25. The choke coil according to claim 1, wherein the coil incorporated in the magnetic core of the closed magnetic path is configured to be wound flatwise using a flat wire. 26. The choke coil according to claim 24, wherein the coil formed by winding the rectangular wire edgewise is wound on the same plane with the wide surface up and down. 27. The choke coil according to claim 1, wherein the coil incorporated in the closed magnetic circuit core is made of a foil metal. 28. The choke coil according to claim 1, wherein the coil incorporated in the closed magnetic circuit core is composed of two coils. 29. The choke coil according to claim 1, wherein the number of coils incorporated in the closed magnetic core is three. 30. The choke coil according to claim 1, wherein the coil incorporated in the closed magnetic path core is wound around a coil bobbin. 31. The choke coil according to claim 1, wherein the winding wound around the peripheral surface of the closed magnetic circuit core is formed of a rectangular wire. 32. A winding wound around a peripheral surface of a closed magnetic circuit core
The choke coil according to claim 1, wherein the choke coil is a single piece. 33. A winding wound around a peripheral surface of a closed magnetic circuit core
The choke coil according to claim 1, wherein the choke coil is a single piece. 34. The choke coil according to claim 1, wherein a normal mode choke coil is formed by a coil built in the closed magnetic circuit core, and a normal mode choke coil is formed by a magnetic core wound around the peripheral surface of the closed magnetic circuit core. 35. A normal mode choke coil comprising a coil built in a closed magnetic circuit core, wherein magnetic fluxes generated in a normal mode cancel each other on a peripheral surface of the closed magnetic circuit core, and magnetic fluxes generated in a common mode are respectively generated. 2. The choke coil according to claim 1, wherein the common mode choke coil is formed by winding two windings in a direction in which the choke coil is added. 36. A coil wound in a direction in which the magnetic fluxes generated in the normal mode are canceled each other and the magnetic fluxes generated in the common mode are added to each other.
2. The choke coil according to claim 1, wherein the common mode choke coil is formed by using two coils, and the normal mode choke coil is formed by a winding wound around the peripheral surface of the closed magnetic circuit core. 37. A coil wound in a direction in which the magnetic fluxes generated in the normal mode are canceled each other and the magnetic fluxes generated in the common mode are added to each other.
A common mode choke coil is formed using three coils, and is wound around the peripheral surface of the magnetic core of the closed magnetic circuit. The choke coil according to claim 1, wherein the common mode choke coil is formed by the two turned windings. 38. A coil wound in a direction in which the magnetic fluxes generated in the normal mode are cancelled, and the magnetic fluxes generated in the common mode are added together.
2. The choke coil according to claim 1, wherein the common mode choke coil is formed by using the two coils, and the normal mode choke coil is formed by a winding wound around the peripheral surface of the closed magnetic circuit core. 39. A normal mode choke coil constituted by a coil built in the closed magnetic circuit core, wherein magnetic fluxes generated in the normal mode cancel each other on the peripheral surface of the closed magnetic circuit core, and magnetic fluxes generated in the common mode are generated. The choke coil according to claim 1, wherein the common mode choke coil is formed by winding three windings in a direction in which the choke coil is added. 40. A coil wound in a direction in which the magnetic fluxes generated in the normal mode are canceled each other and the magnetic fluxes generated in the common mode are added to each other.
A common mode choke coil is formed by using three coils, and the magnetic flux generated in the normal mode cancels out on the peripheral surface of the closed magnetic circuit core, and the magnetic flux generated in the common mode is wound in a direction in which the generated magnetic flux is added. The choke coil according to claim 1, wherein the common mode choke coil is configured by one winding. 41. A common mode choke coil comprising a plurality of coils wound spirally and laminated on one central axis to form a common mode choke coil.
The choke coil described in the above. 42. A common mode choke coil comprising a plurality of coils wound in a solenoid shape and arranged in a bifilar shape to form a common mode choke coil.
The choke coil described in the above. 43. An apparatus according to claim 1, wherein the whole is housed in an insulating case.
The choke coil described in the above. 44. The choke coil according to claim 43, wherein a mounting foot is provided on a mounting surface of the insulating case. 45. The choke coil according to claim 43, wherein a terminal that can be surface-mounted is provided on a mounting surface of the insulating case, and a coil and a winding are connected. 46. The choke coil according to claim 43, wherein the two divided magnetic cores are fixed by an insulating case. 47. The method according to claim 1, wherein the whole is resin-molded.
The choke coil described in the above. 48. A winding is wound first on the circumference of a closed magnetic circuit core, and one end of a previously wound coil is inserted into a part of a coil housing portion of the magnetic core, and is spirally rotated to insert the coil into the magnetic core. The choke coil according to claim 1. 49. The choke coil according to claim 1, wherein a closed magnetic circuit core having a center hole is formed around a previously wound coil by a dust core formed by dust molding a dust core material. 50. The choke coil according to claim 1, wherein a ferrite resin is molded around the coil wound in advance to form a closed magnetic circuit core having a center hole.