JP2006222387A - Choke coil unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a choke coil unit that can be downsized by reducing the number of components through the composite of two kinds of choke coils for configuring a noise filter. <P>SOLUTION: The single phase choke coil unit used for the noise filter provided to an electric path for connecting a power supply and a power converter for suppressing common mode noise is provided with two choke coils comprising magnetic body cores 8, 9 for forming a closed magnetic path and windings 10a1, 10a2, 10b1, 10b2 wound on a pair of magnetic legs of the magnetic body cores. The magnetic body cores are arranged side by side so that one magnetic leg of the one magnetic body core is adjacent to one magnetic leg of the other magnetic body core, the windings of the magnetic legs of each choke coil are wound in opposite directions to each other, and the windings of the magnetic legs of both the choke coils are wound in a combination of different phase; and two magnetic body blocks 14, 15 that magnetically couple the magnetic body cores of the two choke coils by leaving an air gap between both ends of the adjacent magnetic legs of the two choke coils. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a choke coil device used for a noise filter provided in an electric circuit connecting a power source and a power converter.

  In a power conversion device such as an inverter, EMI noise is generated with high-speed switching of a semiconductor element. Of these EMI noises, conduction noise flowing through the power supply line or the ground may be adversely affected, for example, when the device is transmitted to another device having a common power supply, causing the device to malfunction.

  This conduction noise includes two types of noise, common mode and normal mode, and a noise filter is generally used for these measures (for example, Non-Patent Document 1).

  FIG. 10 is a circuit diagram showing a general single-phase noise filter connected between the power supply and the power converter.

  As shown in FIG. 10, the noise filter includes two common mode choke coils 1, 2 and ground capacitors 3a, 3b connected between the phase lines connecting the common mode choke coils 1, 2 and the earth line. The normal mode choke coils 5a and 5b connected between the common mode choke coil 1 and the power supply side terminals ta and tb, the interphase capacitor 6 connected between the power supply side terminals ta and tb, and the common mode choke coil 2 are converted. It is constituted by ground capacitors 4a and 4b connected between a line connecting the device side terminals tc and td and the earth line, and an interphase capacitor 7 connected between the converter side terminals tc and td.

  In the noise filter having such a configuration, the common mode choke coils 1 and 2 have high impedance with respect to common mode noise, and the ground capacitors 3a and 3b and 4a and 4b have low impedance. For this reason, the common mode noise generated from the power conversion device tends to flow to the power supply side, but since the common mode choke coils 1 and 2 have high impedance, they are not transmitted to the power supply, and the low impedance grounding capacitor 3a. , 3b and 4a, 4b are bypassed and returned to the power converter.

On the other hand, for normal mode noise generated from the power converter, the normal mode choke coils 5a and 5b are high impedance, and the interphase capacitors 6 and 7 are low impedance. In addition, noise transmission to the power supply side can be suppressed.
"Electrotechnical Technical Report No. 545 Power Electronics" P22, Fig. 2.34 The Electrotechnical Society Electromagnetic Disturbance Cooperation Research Committee for Semiconductor Power Converters May 1995

  By the way, in order to suppress the two types of noise generated from the power converter, a common mode choke coil and a normal mode choke coil corresponding to each of them are required, so that the size of the noise filter is increased or the number of parts is increased. Connected.

  Therefore, as a means to reduce the size of the noise filter, it is conceivable to reduce the number of parts by substituting the leakage inductance of the common mode choke coil as a normal mode choke coil, but in order to secure the necessary leakage inductance This is not an effective measure, such as the inductance of the common mode choke coil must be increased more than necessary.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to reduce the number of parts and reduce the size by combining two types of choke coils constituting a noise filter. Is to provide.

  In order to achieve the above object, the present invention comprises a choke coil device by the following means.

  The invention corresponding to claim 1 is used for a noise filter provided in an electric circuit connecting between a power source and a power converter, and in a single-phase choke coil device for suppressing common mode noise, a magnetic material forming a closed magnetic circuit. Two choke coils each comprising a body core and a winding wound around a pair of magnetic leg portions of the magnetic core are arranged side by side so that each one magnetic leg portion is adjacent to each other, and each magnetic leg of each choke coil The adjacent magnetic leg portions of the two choke coils are wound so that the windings of the two choke coils are opposite to each other and the windings of the adjacent magnetic leg portions of both choke coils are combined in different phases. There are two magnetic blocks that magnetically couple the magnetic cores of the two choke coils with a gap between the two ends.

  The invention corresponding to claim 2 is used for a noise filter provided in an electric circuit connecting a power source and a power converter, and a magnetic material forming a closed magnetic circuit in a single-phase choke coil device for suppressing common mode noise. Two choke coils each comprising a body core and a winding wound around a pair of magnetic leg portions of the magnetic core are arranged side by side so that each one magnetic leg portion is adjacent to each other, and each magnetic leg of each choke coil The windings of the two choke coils are wound in the same direction, and the windings of the adjacent magnetic leg portions of both choke coils are wound in the same phase. Two magnetic blocks that magnetically couple the magnetic cores of the two choke coils with a gap between them are provided.

  The invention corresponding to claim 3 is used in a noise filter provided in an electric circuit connecting a power source and a power converter, and a magnetic material forming a closed magnetic circuit in a single-phase choke coil device that suppresses common mode noise. Two choke coils each comprising a body core and a winding wound around a pair of magnetic leg portions of the magnetic core are arranged side by side so that each one magnetic leg portion is adjacent to each other, and each magnetic leg of each choke coil The adjacent magnetic leg portions of the two choke coils are wound so that the windings of the two choke coils are opposite to each other and the windings of the adjacent magnetic leg portions of both choke coils are combined in different phases. Protrusions are provided on the opposing surface sides of the two ends of the two, so that the magnetic cores of the two choke coils are magnetically coupled via a gap existing between the protrusions.

  The invention corresponding to claim 4 is used in a noise filter provided in an electric circuit connecting between a power supply and a power converter, and in a single-phase choke coil device for suppressing common mode noise, a magnetic material forming a closed magnetic circuit. Two choke coils each comprising a body core and a winding wound around a pair of magnetic leg portions of the magnetic core are arranged side by side so that each one magnetic leg portion is adjacent to each other, and each magnetic leg of each choke coil The windings of the two choke coils are wound in the same direction, and the windings of the adjacent magnetic leg portions of both choke coils are wound in the same phase. In the configuration in which protrusions are provided on the opposite surfaces of the two magnetic cores, the magnetic cores of the two choke coils are magnetically coupled via a gap existing between the protrusions.

  The invention corresponding to claim 5 is the choke coil device of the invention corresponding to claim 3 or claim 4, wherein the protrusions respectively provided on the opposing surface sides of both end portions of the adjacent magnetic leg portions of the two choke coils. A pin for adjusting the width of the gap is provided in the gap between the parts.

  The invention corresponding to claim 6 is used in a noise filter provided in an electric circuit connecting between a power source and a power converter, and in a single-phase choke coil device for suppressing common mode noise, As a magnetic core of the choke coil, one end of each pair of magnetic leg portions including a pair of magnetic leg portions is connected in common by a yoke portion, and the other end portion of each pair of magnetic leg portions is connected by a yoke portion. One magnetic core is formed by providing a gap between the facing ends of each yoke part and the windings of the magnetic leg parts of each pair are opposite to each other. Each of the windings of the magnetic leg portion and the other pair of magnetic leg portions is wound so as to have a combination of different phases.

  The invention corresponding to claim 7 is used in a noise filter provided in an electric circuit connecting between a power source and a power converter, and in a single-phase choke coil device for suppressing common mode noise, As a magnetic core of the choke coil, one end of each pair of magnetic leg portions including a pair of magnetic leg portions is connected in common by the yoke portion, and the other end portion of each pair of magnetic leg portions is connected by the yoke portion. One magnetic core is formed with a gap between the facing ends of each yoke part, and one pair of adjacent pairs is arranged so that the windings of the magnetic leg parts of each pair are in the same direction. The windings of the magnetic leg part and the other pair of magnetic leg parts are wound so as to be in the same phase.

  The invention corresponding to claim 8 is used for a noise filter provided in an electric circuit connecting a power source and a power converter, and in a single-phase choke coil device for suppressing common mode noise, a magnetic material forming a closed magnetic circuit. Two choke coils comprising a body core and windings wound around a pair of magnetic leg portions of the magnetic core are arranged in parallel with each magnetic leg portion facing each other, and the winding of each magnetic leg portion of each choke coil is arranged. The wires are wound so that the wires are in the same direction as each other and the windings of the opposing magnetic leg portions of both choke coils are in different phases, and between the opposite ends of the magnetic leg portions of the two choke coils facing each other Two magnetic blocks that magnetically couple the magnetic cores of the two choke coils with a gap are provided.

  The invention corresponding to claim 9 is used in a noise filter provided in an electric circuit connecting between a power source and a power converter, and in a single-phase choke coil device for suppressing common mode noise, a magnetic material forming a closed magnetic circuit. Two choke coils comprising a body core and windings wound around a pair of magnetic leg portions of the magnetic core are arranged in parallel so that the magnetic leg portions face each other, and Both ends of the magnetic leg portions facing each other of the two choke coils are wound so that the windings are reversed and the windings of the opposing magnetic leg portions of both choke coils are in the same phase combination. Two magnetic blocks that magnetically couple the magnetic cores of the two choke coils with a gap between them are provided.

  The invention corresponding to claim 10 is used in a noise filter provided in an electric circuit connecting between a power source and a power converter, and in a single-phase choke coil device for suppressing common mode noise, a magnetic material forming a closed magnetic circuit. Two choke coils comprising a body core and windings wound around a pair of magnetic leg portions of the magnetic core are arranged in parallel so that the magnetic leg portions face each other, and The windings are wound so that the windings are in the same direction, and the windings of the opposing magnetic leg portions of both choke coils are in different phases, and both ends of the opposing magnetic leg portions of the two choke coils face each other. Each side is provided with a protrusion, and the magnetic cores of the two choke coils are magnetically coupled via a gap existing between the protrusions.

  The invention corresponding to claim 11 is used in a noise filter provided in an electric circuit connecting between a power source and a power converter, and in a single-phase choke coil device for suppressing common mode noise, a magnetic material forming a closed magnetic circuit. Two choke coils comprising a body core and windings wound around a pair of magnetic leg portions of the magnetic core are arranged in parallel so that the magnetic leg portions face each other, and Both ends of the opposite magnetic leg portions of the two choke coils are wound so that the windings are reversed and the windings of the opposite magnetic leg portions of both choke coils are in the same phase combination. As a configuration in which protrusions are provided on the opposite sides of the two, the magnetic cores of the two choke coils are magnetically coupled via a gap existing between the protrusions.

  The invention corresponding to claim 12 is the choke coil device of the invention corresponding to claim 10 or claim 11, wherein the protrusions are provided on opposite sides of both ends of the opposing magnetic leg portions of the two choke coils. A pin for adjusting the width of the gap is provided in the gap.

  The invention corresponding to claim 13 includes the choke coil device according to any one of claims 1 to 12 and suppresses common mode noise and normal mode noise generated in the power converter.

  According to the present invention, the number of parts can be reduced and the size can be reduced by combining the two types of choke coils constituting the noise filter.

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

  1A and 1B show a first embodiment of a choke coil device according to the present invention, where FIG. 1A is a front view, and FIG. 1B is a cross-sectional view taken along line XX ′ in FIG. FIG.

  1A and 1B, reference numerals 8 and 9 denote magnetic cores that form a closed magnetic path by a pair of magnetic leg portions 8a, 8b, 9a, and 9b and yoke portions 8c and 9c that connect the magnetic leg portions. These two magnetic cores 8 and 9 are arranged side by side with an appropriate gap so that one magnetic leg portion is adjacent to each other. Here, in each of the magnetic cores 8 and 9, the adjacent magnetic leg portions 8b and 9a are referred to as inner magnetic leg portions, and the opposite magnetic leg portions 8a and 9b are referred to as outer magnetic leg portions.

  One magnetic core 8 has, for example, an R-phase winding 10a1 on the outer magnetic leg 8a and an S-phase winding 10b1 on the inner magnetic leg 8b, and the other magnetic core 9 has an inner magnetic leg. Two common mode choke coils are formed by winding an R phase winding 10a2 on 9a and an S phase winding 10b2 on the outer magnetic leg portion 9b in a direction in which magnetic fluxes are strengthened by a common mode current.

  However, the winding is wound in the opposite direction between the two common mode choke coils. That is, in FIG. 1A, when the R-phase winding 10a1 is counterclockwise, the winding 10a2 is clockwise. In the S phase, the winding 10b1 is clockwise while the winding 10b2 is counterclockwise. The windings of the inner magnetic leg portions 8b and 9a of the magnetic cores 8 and 9 that are close to each other are combined in different phases.

  The windings 10a1 and 10a2 and the windings 10b1 and 10b2 are connected by intermediate terminals 11a and 11b, respectively. Further, the input terminals 12a and 12b of the windings 10a1 and 10b1 are connected to the power source side, and the output terminals 13a and 13b of the windings 10a2 and 10b2 are connected to the power converter side.

  On the other hand, between the opposing surfaces of the yoke portions 8c and 9c corresponding to the both end sides of the inner magnetic leg portions 8b and 9a of the magnetic cores 8 and 9, the magnetic blocks 14 and 15 are respectively disposed with gaps. . In addition, although the space | gap exists in the both sides of the magnetic body blocks 14 and 15 in FIG. 1, this space | gap should just exist in one or more places.

  In the choke coil device having such a configuration, as shown by a dotted arrow, a common mode choke coil is formed by the magnetic core 8 and the windings 10a1 and 10b1 through which the magnetic flux φc passes through the magnetic circuit by the common mode current Ic. In addition to constituting another common mode choke coil with the magnetic core 9 and the windings 10a2 and 10b2, the magnetic block 14 is applied to the normal mode current In flowing through the windings as indicated by solid arrows. , 15 is formed through the two magnetic cores 8 and 9, and the magnetic flux φn passes therethrough, so that the choke coil exhibits high impedance against normal mode noise.

  The space between the magnetic cores 8 and 9 and the magnetic blocks 14 and 15 is saturated by the current flowing through the windings 10a1, 10b1, 10a2, and 10b2. Ensure that width to not.

  As described above, according to the first embodiment, since the inductance of the normal mode can be secured by using the two common mode choke coils, it is not necessary to separately provide the normal mode choke coils, and the choke coil device can be downsized. Can be planned.

  2A and 2B show a second embodiment of the choke coil device according to the present invention, where FIG. 2A is a front view and FIG. 2B is a cross-sectional view taken along line XX ′ in FIG. In the figure, the same parts as those in FIG.

  In the second embodiment, as shown in FIG. 2, the magnetic material described in the first embodiment so that the windings wound around the inner magnetic legs 8b, 9a of the magnetic cores 8, 9 are in phase. The windings 10a2 and 10b2 of the core 9 are interchanged, and the winding direction is further reversed. Then, the winding 10a1 of the outer magnetic leg portion 8a of the magnetic core 8, the winding 10a2 of the outer magnetic leg portion 9b of the magnetic core 9, and the winding 10b1 of the inner magnetic leg portion 8b of the magnetic core 8 and the magnetic core. 9 are connected by an R-phase intermediate terminal 11a and an S-phase intermediate terminal 11b such that the winding direction of the winding 10b2 of the inner magnetic leg portion 9a is the same.

  Even in such a configuration, the magnetic resistance straddling the two magnetic cores 8 and 9 via the magnetic blocks 14 and 15 with respect to the magnetic flux φn generated by the normal mode current flowing through the windings 10a1, 10b1, 10a2 and 10b2. Since a low magnetic circuit is formed, the same effect as the first embodiment can be obtained.

  FIGS. 3A and 3B show a third embodiment of the choke coil device according to the present invention, where FIG. 3A is a front view, and FIG. 3B is a cross-sectional view taken along line XX ′ in FIG. In the figure, the same parts as those in FIG.

  In the third embodiment, as shown in FIG. 3, a closed magnetic path is formed by a pair of magnetic leg portions 16a, 16b, 17a, 17b and yoke portions 16c, 17c connecting the magnetic leg portions, and an inner magnetic leg portion is formed. Appropriate gaps are provided between the magnetic cores 16 and 17 having protrusions 16d and 17d extending horizontally on the end surfaces of the yoke portions 16c and 17c corresponding to both ends of the 16b and 17a so that the inner magnetic leg portions are adjacent to each other. The other arrangements are the same as in the first embodiment.

  With this configuration, the yoke portions corresponding to both end sides of the inner magnetic leg portions 16b and 17a of the magnetic cores 16 and 17 can be provided without providing the magnetic blocks 14 and 15 as in the first embodiment. Since the projecting portions 16d and 17d provided on the end faces of 16c and 17c are opposed to each other with a gap, high inductance is ensured with respect to the normal mode current as in the first embodiment.

  Therefore, in addition to the same effects as those of the first embodiment, the number of parts can be reduced, and the manufacture of the choke coil device is facilitated.

  Note that the winding direction and phase combination of each winding wound around each magnetic leg portion of the magnetic cores 8 and 9 of the two choke coils can be implemented as described above even if they are configured in the same manner as in the second embodiment. The same effect as the form can be obtained.

  4A and 4B show a fourth embodiment of the choke coil device according to the present invention, where FIG. 4A is a front view, and FIG. 4B is a cross-sectional view taken along line XX ′ in FIG. In the figure, the same parts as those in FIG. 3 are denoted by the same reference numerals and the description thereof is omitted, and different points will be described here.

  In the fourth embodiment, the width of the gap is adjusted between the protrusions 16d and 17d provided on the end surfaces of the yoke portions 16c and 17c corresponding to both end sides of the inner magnetic leg portions 16b and 17a of the magnetic cores 16 and 17, respectively. Pins 18 and 19 are provided for this purpose. The pins 18 and 19 may be integrally formed on one or both of the protrusions 16d and 17d of the magnetic cores 16 and 17.

  Here, in the case where the pins 18 and 19 are magnetic bodies, if the cross-sectional area is large, the magnetic resistance of the path extending between the two magnetic cores 16 and 17 becomes low, and the magnetic cores 16 and 17 are magnetically saturated. The performance as a choke coil is reduced. For this reason, at least one of the pins 18 and 19 needs to have a small cross-sectional area so that the magnetic cores 16 and 17 are not magnetically saturated.

  With such a configuration, the same operational effects as those of the first embodiment and the third embodiment can be obtained, and the adjustment of the air gap is facilitated in assembling the choke coil device.

  FIGS. 5A and 5B show a fifth embodiment of the choke coil device according to the present invention, where FIG. 5A is a front view, and FIG. 5B is a cross-sectional view taken along line XX ′ in FIG. In the figure, the same parts as those in FIG.

  In the fifth embodiment, as shown in FIG. 5, the four magnetic leg portions 20a, 20b, 20c, 20d and the other end of the magnetic leg portions 20a, 20b and the yoke portion 20e1 connecting between one end portions of these magnetic leg portions. One magnetic core 20 is formed by integrating a yoke portion 20e2 connecting between the portions, and a yoke portion 20e3 connecting the other end portions of the magnetic leg portions 20c and 20d with a gap between the end surface of the yoke portion 20e2. Other than that, like the first embodiment, the magnetic leg portion 20a of the magnetic core 20 has an R-phase winding 10a1, an S-phase winding 10b1 on the magnetic leg portion 20b, and an R-phase winding on the magnetic leg portion 20c. The S-phase winding 10b2 is wound around the winding 10a2 and the magnetic leg portion 20d in a direction in which the magnetic flux is strengthened by the common mode current.

  Even in such a configuration, since the inductance is secured with respect to the normal mode current, in addition to obtaining the same operation effect as the first embodiment, one magnetic body in which two magnetic cores are integrated. Since the core 20 is used, it is not necessary to adjust the air gap when manufacturing the coil, and the manufacturing is easy.

  Note that the winding direction and phase combination of each winding wound around each magnetic leg portion of the magnetic core 20 of the two choke coils may be configured in the same manner as in the second embodiment, and Similar effects can be obtained.

  6A, 6B, and 6C show a sixth embodiment of the choke coil device according to the present invention, where FIG. 6A is a front view and FIG. 6B is a line YY ′. A sectional view taken along the arrow, (c) is a view of (b) seen from the direction of arrow A, and the same parts as those in FIG.

  As shown in FIG. 6, the two magnetic legs 8a and 8b of the magnetic core 8 described in the first embodiment and the pair of magnetic legs 9a and 9b of the magnetic core 9 face each other. The body cores 8 and 9 are arranged with an appropriate gap, the R-phase winding 10a1 is wound around the magnetic leg portion 8a of the magnetic core 8, the S-phase winding 10b1 is wound around the magnetic leg portion 8b, and Two common mode choke coils are formed by winding an R-phase winding 10a2 around the magnetic leg portion 9a of the magnetic core 9 and winding an S-phase winding 10b2 around the magnetic leg portion 9b.

  The windings 10a1 and 10a2 and the windings 10b1 and 10b2 are connected by intermediate terminals 11a and 11b, respectively. Further, the input terminals 12a and 13a of the windings 10a1 and 10b1 are connected to the power source side, and the output terminals 13a and 13b of the windings 10a2 and 10b2 are connected to the power converter side.

  Further, between the yoke portion 8c corresponding to both ends of the pair of magnetic legs 8a and 8b of the magnetic core 8 and the yoke portion 9c corresponding to both ends of the pair of magnetic legs 9a and 9b of the magnetic core 9. The magnetic blocks 21 and 22 are arranged with a gap.

  Even in such a configuration, a magnetic circuit is formed for the normal mode current across the two magnetic cores 8 and 9 via the two magnetic blocks 21 and 22 as in the first embodiment. The same effects as those of the first embodiment can be obtained.

  7 (a), (b), and (c) show a seventh embodiment of the choke coil device according to the present invention, (a) is a front view, and (b) is a line Y-Y '. A sectional view taken along the arrow, (c) is a view of (b) seen from the direction of the arrow A, the same reference numerals are given to the same parts as in FIG.

  In the seventh embodiment, as shown in FIG. 7, the magnetic core described in the sixth embodiment so that the windings wound around the magnetic leg portions 8b, 9a of the magnetic cores 8, 9 are in phase. Nine windings 10a2 and 10b2 are interchanged, and the winding direction is further reversed. Then, the winding 10a1 of the magnetic leg 8a of the magnetic core 8 and the winding 10a2 of the magnetic leg 9b of the magnetic core 9, and the winding 10b1 of the magnetic leg 8b of the magnetic core 8 and the magnetic core 9 are magnetic. The winding direction of the winding 10b2 of the leg portion 9a is the same, and these are connected by the R-phase intermediate terminal 11a and the S-phase intermediate terminal 11b.

  Even with such a configuration, the magnetic resistance φn generated by the normal mode current flowing through each of the windings 10a1, 10b1, 10a2, and 10b2 is such that the magnetic resistance straddling the two magnetic cores 8 and 9 via the magnetic blocks 21 and 22 is reduced. Since a low magnetic circuit is formed and the normal mode inductance is ensured as in the sixth embodiment, the same effects as in the sixth embodiment can be obtained.

  8A, 8B, and 8C show an eighth embodiment of the choke coil device according to the present invention, where FIG. 8A is a front view and FIG. 8B is a line YY ′. A sectional view taken along the arrow, (c) is a view of (b) seen from the direction of the arrow A, the same reference numerals are given to the same parts as in FIG.

  In the eighth embodiment, as shown in FIG. 8, the two magnetic bodies are formed such that the pair of magnetic legs 23 a and 23 b of the magnetic core 23 and the pair of magnetic legs 24 a and 24 b of the magnetic core 24 face each other. The configuration in which the cores 23 and 24 are arranged with an appropriate gap is the same as that in the sixth embodiment, but the yoke portions 23c connecting both ends of the magnetic leg portions 23a and 23b and both end portions of the magnetic leg portions 24a and 24b. Are provided with protrusions 23d and 24d extending horizontally on the upper and lower end surfaces of the facing yoke portion 24c, and the magnetic block is omitted. The rest is the same as in the sixth embodiment. .

  In FIG. 8, the protrusions 23d and 24d are provided on the two end faces on the upper and lower sides facing each other. However, the protrusions may be provided only on one of the end faces.

  Even in such a configuration, the inductance can be ensured for the normal mode current as in the sixth embodiment. In addition to obtaining the same operational effects as those in the first embodiment, Compared with the case, the number of parts can be reduced, and the manufacture of the choke coil device is facilitated.

  It should be noted that the winding direction and the combination of phases of the windings wound around the magnetic leg portions of the magnetic cores 23 and 24 of the two choke coils may be configured in the same manner as in the seventh embodiment, but the above-described embodiment. The same effect can be obtained.

  FIGS. 9A, 9B and 9C show a ninth embodiment of the choke coil device according to the present invention, where FIG. 9A is a front view and FIG. 9B is a line YY ′. A sectional view taken along the arrow, (c) is a view of (b) as viewed from the direction of the arrow A, the same reference numerals are given to the same parts as in FIG.

  In the ninth embodiment, the upper and lower sides of the facing side of the yoke portion 23c connecting both ends of the magnetic leg portions 23a, 23b of the two magnetic cores 23, 24 and the yoke portion 24c connecting both ends of the magnetic leg portions 24a, 24b are arranged. Pins 25 and 26 for adjusting the width of the air gap are provided between the projecting portions 23d and 24d respectively provided at the two end faces. The pins 25 and 26 may be integrally formed on one or both of the protrusions 23d and 24d of the magnetic cores 23 and 24.

  Here, in the case where the pins 25 and 26 are magnetic bodies, if the cross-sectional area is large, the magnetic resistance of the path extending between the two magnetic cores 23 and 24 becomes low, and the magnetic cores 23 and 24 are magnetically saturated. The performance as a choke coil is reduced. For this reason, at least one of the pins 25 and 26 needs to have a small cross-sectional area so that the magnetic cores 23 and 24 are not magnetically saturated.

  With such a configuration, the same effects as those of the sixth embodiment can be obtained, and the adjustment of the gap can be facilitated in assembling the choke coil device.

(A), (b) shows 1st Embodiment of the choke coil apparatus by this invention, (a) is a front view, (b) is arrow sectional drawing which follows (a) at XX 'line. (A), (b) shows 2nd Embodiment of the choke coil apparatus by this invention, (a) is a front view, (b) is arrow sectional drawing which follows (a) along XX 'line. (A), (b) shows 3rd Embodiment of the choke coil apparatus by this invention, (a) is a front view, (b) is arrow sectional drawing which follows (a) along XX 'line. (A), (b) shows 4th Embodiment of the choke coil apparatus by this invention, (a) is a front view, (b) is arrow sectional drawing which follows (a) along XX 'line. (A), (b) shows 5th Embodiment of the choke coil apparatus by this invention, (a) is a front view, (b) is arrow sectional drawing which follows (a) along XX 'line. (A), (b), (c) shows 6th Embodiment of the choke coil apparatus by this invention, (a) is a front view, (b) is an arrow which follows (Y) along a YY 'line. Sectional view, (c) is a view of (b) seen from the direction of arrow A. (A), (b), (c) shows 7th Embodiment of the choke coil apparatus by this invention, (a) is a front view, (b) is an arrow which follows (Y) along a YY 'line. Sectional view, (c) is a view of (b) seen from the direction of arrow A. (A), (b), (c) shows 8th Embodiment of the choke coil apparatus by this invention, (a) is a front view, (b) is an arrow which follows (Y) along a YY 'line. Sectional view, (c) is a view of (b) seen from the direction of arrow A. (A), (b), (c) shows 9th Embodiment of the choke coil apparatus by this invention, (a) is a front view, (b) is an arrow which follows (Y) along YY 'line. Sectional view, (c) is a view of (b) seen from the direction of arrow A. The circuit diagram which shows the noise filter for common single phases connected between a power supply and a power converter device.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1,2 ... Common mode choke coil, 3a, 3b, 4a, 4b ... Grounding capacitor, 5a, 5b ... Normal mode choke coil, 6, 7 ... Interphase capacitor, 8, 9, 23, 24 ... Magnetic core, 10a1, 10a2 ... R phase winding, 10b1, 10b2 ... S phase winding, 11a ... R phase intermediate terminal, 11b ... S phase intermediate terminal, 12a ... R phase input terminal, 12b ... S phase input terminal, 13a ... R phase output terminal , 13b ... S phase output terminal, 14, 15, 16, 17, 20, 21, 22 ... magnetic block, 18, 19, 25, 26 ... pin

Claims (13)

In a single-phase choke coil device that is used in a noise filter provided in an electric circuit connecting a power source and a power converter, and suppresses common mode noise.
Two choke coils comprising a magnetic core forming a closed magnetic path and a winding wound around a pair of magnetic leg portions of the magnetic core are arranged side by side so that each magnetic leg portion is adjacent to each other. Two choke coils are wound so that the windings of the magnetic leg portions of the choke coil are opposite to each other, and the windings of the adjacent magnetic leg portions of both choke coils are combined in different phases. A choke coil device comprising two magnetic blocks for magnetically coupling magnetic cores of two choke coils with a gap between both ends of adjacent magnetic leg portions. In a single-phase choke coil device that is used in a noise filter provided in an electric circuit connecting a power source and a power converter, and suppresses common mode noise.
Two choke coils comprising a magnetic core forming a closed magnetic path and a winding wound around a pair of magnetic leg portions of the magnetic core are arranged side by side so that each magnetic leg portion is adjacent to each other. The windings of the magnetic leg portions of the choke coil are wound in the same direction, and the windings of the adjacent magnetic leg portions of both choke coils are wound in the same phase, and the two choke coils are adjacent to each other. 2. A choke coil device comprising two magnetic blocks for magnetically coupling magnetic cores of two choke coils with a gap between both ends of a magnetic leg portion. In a single-phase choke coil device that is used in a noise filter provided in an electric circuit connecting a power source and a power converter, and suppresses common mode noise.
Two choke coils comprising a magnetic core forming a closed magnetic path and a winding wound around a pair of magnetic leg portions of the magnetic core are arranged side by side so that each magnetic leg portion is adjacent to each other. Two choke coils are wound so that the windings of the magnetic leg portions of the choke coil are opposite to each other, and the windings of the adjacent magnetic leg portions of both choke coils are combined in different phases. The magnetic cores of the two choke coils are magnetically coupled via a gap existing between the projecting portions so that the projecting portions are provided on the opposing surface sides of both end portions of the adjacent magnetic leg portions. A choke coil device characterized by being configured as described above. In a single-phase choke coil device that is used in a noise filter provided in an electric circuit connecting a power source and a power converter, and suppresses common mode noise.
Two choke coils comprising a magnetic core forming a closed magnetic path and a winding wound around a pair of magnetic leg portions of the magnetic core are arranged side by side so that each magnetic leg portion is adjacent to each other. The windings of the magnetic leg portions of the choke coil are wound in the same direction, and the windings of the adjacent magnetic leg portions of both choke coils are wound in the same phase, and the two choke coils are adjacent to each other. Protrusions are provided on the opposing surface sides of both ends of the magnetic leg, so that the magnetic cores of the two choke coils are magnetically coupled via a gap existing between the protrusions. A choke coil device characterized by that.   5. The choke coil device according to claim 3, wherein the width of the gap is adjusted to a gap between protrusions provided on opposite sides of both end portions of adjacent magnetic leg portions of the two choke coils. A choke coil device provided with a pin for the purpose. In a single-phase choke coil device that is used in a noise filter provided in an electric circuit connecting a power source and a power converter, and suppresses common mode noise.
As a magnetic core of two choke coils arranged side by side, one end of each of the two magnetic leg portions including a pair of magnetic leg portions is connected in common by a yoke portion, and the other magnetic leg portions of each set are connected to each other. The end portions are connected by the yoke portions to form one magnetic core having a gap between the facing ends of each yoke portion, and the windings of the magnetic leg portions of each set are opposite to each other. A choke coil device, wherein the windings of one adjacent pair of magnetic leg portions and the other set of magnetic leg portions are wound so as to form a combination of different phases. In a single-phase choke coil device that is used in a noise filter provided in an electric circuit connecting a power source and a power converter, and suppresses common mode noise.
As a magnetic core of two choke coils arranged side by side, one end of each of the two pairs of magnetic legs, each paired with a pair of magnetic legs, is connected in common by the yoke and The end portions are connected by the yoke portions to form one magnetic core having a gap between the facing ends of each yoke portion, and the windings of the magnetic leg portions of each set are in the same direction, A choke coil device, wherein windings of one pair of adjacent magnetic leg portions and the other pair of magnetic leg portions are wound so as to be in the same phase. In a single-phase choke coil device that is used in a noise filter provided in an electric circuit connecting a power source and a power converter, and suppresses common mode noise.
Two choke coils comprising a magnetic core forming a closed magnetic path and windings wound around a pair of magnetic leg portions of the magnetic core are arranged in parallel with the respective magnetic leg portions facing each other. The windings of the magnetic leg portions are wound in the same direction as each other, and the windings of the opposing magnetic leg portions of both choke coils are wound in different phases. 2. A choke coil device comprising two magnetic blocks that magnetically couple magnetic cores of two choke coils with a gap between both ends of a leg portion. In a single-phase choke coil device that is used in a noise filter provided in an electric circuit connecting a power source and a power converter, and suppresses common mode noise.
Two choke coils comprising a magnetic core forming a closed magnetic path and windings wound around a pair of magnetic leg portions of the magnetic core are arranged in parallel so that the magnetic leg portions face each other. The windings of the magnetic leg portions of each of the choke coils are wound in opposite directions and the windings of the opposing magnetic leg portions of both choke coils are wound in a combination of the same phase, so that the two choke coils face each other. 2. A choke coil device comprising two magnetic blocks for magnetically coupling magnetic cores of two choke coils with a gap between both ends of a magnetic leg portion. In a single-phase choke coil device that is used in a noise filter provided in an electric circuit connecting a power source and a power converter, and suppresses common mode noise.
Two choke coils comprising a magnetic core forming a closed magnetic path and windings wound around a pair of magnetic leg portions of the magnetic core are arranged in parallel so that the magnetic leg portions face each other. The windings of the magnetic leg portions of the two choke coils are wound in the same direction, and the windings of the opposing magnetic leg portions of the two choke coils are wound in different phases. The protrusions are provided on the opposite sides of the both end portions of the part, and the magnetic cores of the two choke coils are magnetically coupled via a gap existing between the protrusions. Choke coil device. In a single-phase choke coil device that is used in a noise filter provided in an electric circuit connecting a power source and a power converter, and suppresses common mode noise.
Two choke coils comprising a magnetic core forming a closed magnetic path and windings wound around a pair of magnetic leg portions of the magnetic core are arranged in parallel so that the magnetic leg portions face each other. The windings of the magnetic leg portions of each of the choke coils are wound in opposite directions and the windings of the opposing magnetic leg portions of both choke coils are wound in a combination of the same phase, and the two choke coils face each other. Protrusions are provided on the opposite sides of both ends of the magnetic legs, and the magnetic cores of the two choke coils are magnetically coupled via a gap existing between the protrusions. A choke coil device.   12. The choke coil device according to claim 10 or 11, wherein the width of the gap is adjusted to a gap between protrusions provided on opposite sides of both ends of the opposing magnetic leg portions of the two choke coils. A choke coil device provided with a pin.   A noise filter comprising the choke coil device according to any one of claims 1 to 12 and suppressing common mode noise and normal mode noise generated in a power converter.

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