JP4817437B2 - Common mode choke composite and output device - Google Patents

Description

The present invention relates to a common mode choke composite used for a digital amplifier output stage and an output device having the common mode choke composite , and more particularly to a common mode choke composite capable of converting a connection system of output components such as a speaker and the like. It relates to the output device used.

  When an output component such as a speaker is driven by a digital amplifier, as shown in Non-Patent Document 1 below, connection methods include SEPP (Single-Ended-Push-Pull) connection and BTL (Bridge-Tied-Load) connection. Used. A common mode choke coil is inserted on the input side of the speaker for absorbing common mode noise.

  FIG. 33 shows a basic circuit diagram for two channels of an output device using an SEPP connection type digital amplifier. The output stages of the digital amplifiers 1 and 2 have common mode choke coils 3 and 4 for absorbing common mode noise, respectively. The inductor L1, the capacitor C1, the inductor L2, and the capacitor C2 constitute a low-pass filter provided at the output stage of the digital amplifiers 1 and 2, respectively. 6 and 7 are load speakers. In the SEPP connection system, one load speaker is driven by one amplifier. One common mode choke coil is required for each channel.

  FIG. 34 shows a circuit diagram in the case where one channel of a BTL connection type output device is configured using the digital amplifiers 1 and 2. The BTL connection system drives one load speaker 8 with two digital amplifiers 1 and 2. The output stage has one common mode choke coil 5, and the inductor L1, the capacitor C1, the inductor L2, and the capacitor C2 constitute a low-pass filter provided at the output stage of the digital amplifiers 1 and 2. The theoretical effective output of the BTL connection method is four times that of the SEPP connection method. Since the current flowing through the output path is twice that of the SEPP connection method, it is necessary to select a common mode choke coil 5 having a current capacity twice that of the common mode choke coils 3 and 4.

New Japan Radio NJU8711 Application Note Ver.2003-09-18

  For example, in order to share a circuit board, the circuit of the output device for two channels by the SEPP connection method and the circuit of the output device for one channel by the BTL connection method are configured on the same substrate and are used by switching electrically. In this case, as shown in FIG. 35, it is necessary to mount two common mode choke coils for the SEPP connection method 2 channels and one common mode choke coil for the BTL connection method 1 channel. There are problems that the number of manufacturing steps increases and the mounting area also increases. Also, when switching from the SEPP connection method to the BTL connection method, the common mode choke coils 3 and 4 are unnecessary and are wasted, and unused circuit patterns are opened, and the open patterns serve as antennas. There was a problem that unnecessary radiation was generated.

  Further, for example, for the purpose of sharing the same board, as shown in FIG. 36, when the circuit board configuration is such that 2 channels of the SEPP connection method output device or 1 channel of the BTL connection method output device can be mounted on the same substrate. In the case of the SEPP connection method, the common mode choke coils 3 and 4 and the load speakers 6 and 7 are mounted. In the case of the BTL connection method, the common mode choke coil 5 and the load speaker 8 must be mounted. In the process, it was necessary to replace the parts according to the connection method, and there was a problem that the production management man-hours increased. Further, as in the case of FIG. 35, there is a problem that the unused pattern becomes open, and this open pattern serves as an antenna to generate unnecessary radiation.

Therefore, the object of the present invention is to solve the above problems in an output device using a digital amplifier, so that the connection method can be switched to SEPP connection or BTL connection, reducing the number of components, reducing the mounting area, and manufacturing. It is an object of the present invention to provide a common mode choke composite and an output device that can reduce man-hours and production control man-hours and can prevent unnecessary radiation due to an unused open pattern.

In order to achieve the above object, a common mode choke composite according to the present invention is used in an output device including a digital amplifier and an output component, and is separated into two common mode choke coils inserted on the input side of the output component. possible common mode choke Oite the complex, the common mode choke complex consists of winding portion having two windings formed on the outer periphery of each of said core and two cores, the core or the wound By making at least one of the wire portions movable, the core has a structure of an open magnetic circuit or a closed magnetic circuit, and the two common mode choke coils are short-circuited or opened at the winding start and winding end of the winding. It is configured so as to electrically both states of the separated state or electrically coupled state can be selected.

Here, to only pre SL core may be movable, both the core and the winding portion may be movable.

Also, common mode choke complexes of the present invention is used in the output device comprising a digital amplifier and the output component, the output component of the inserted two common mode choke coil separable common mode choke composite input side Oite the body, from the common mode choke complex common core portion of magnetically couplable to said core and winding unit having two windings formed on the outer periphery of each of said core and two cores Thus, the core and the common core portion are configured to have an open magnetic circuit or a closed magnetic circuit by making the common core portion movable, and the winding start and the winding end of the winding are short-circuited or opened. Two common mode choke coils and the common core portion are configured to be selectable in either an electrically separated state or an electrically coupled state.

  Here, the core or the common core portion may be configured by combining a non-magnetic material and a magnetic material.

  Moreover, the shape of the said core or the said common core part may be a toroidal ring shape.

  Further, the common core portion may have a cylindrical shape, and at least both end portions thereof may be divided into three by a plane parallel to the central axis, the central portion may be a magnetic body, and both sides thereof may be non-magnetic bodies.

  In addition, the common core portion has a cylindrical shape, and is divided into five at least at both end portions thereof by a plane parallel to the central axis, the central portion is a magnetic body, both sides thereof are non-magnetic bodies, and the outside thereof is a magnetic body. In the state where the two common mode choke coils are electrically separated, the core of each common mode choke coil may constitute a closed magnetic circuit.

The output device of the present invention has the common mode choke composite described above.

  According to the present invention, in an output device in which the SEPP connection method and the BTL connection method can be configured on the same substrate using a digital amplifier, the output unit is electrically coupled as described above or electrically separated. Since two common mode choke coils that can select both of the two states are used, when switching between the SEPP connection method and the BTL connection method as in the past, two common mode choke coils for the SEPP connection method and the BTL One common mode choke coil for connection method is not required separately, and the number of parts, manufacturing man-hours, and mounting area can be reduced. Further, since no unused pattern is generated, unnecessary radiation due to the unused pattern can be prevented.

  In addition, when the difference in connection method is configured using a common board as in the past, it is not necessary to mount the common mode choke coil and the load speaker separately, and the components are replaced according to the connection method in the amplifier manufacturing process. Since there is no need to do this, the production management man-hours can be reduced. Further, since no unused pattern is generated, unnecessary radiation due to the unused pattern can be prevented.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is an external perspective view showing a first embodiment of a common mode choke coil according to the present invention. FIG. 1 shows two common mode choke coils used in an output device, and bobbins 11 and 12 are mounted on U-shaped cores 9 and 10, respectively, to form two common mode choke coils. Two copper wires 13 and 14 are wound around the bobbin 11 simultaneously in the same winding direction. Two copper wires 15 and 16 are wound around the bobbin 12 simultaneously in the same winding direction. In FIG. 1, -1 is added to the reference and displayed to indicate the start of winding of each copper wire, and -2 is added to the reference and displayed to indicate the end of winding of each copper wire. By using these two coils, the core is moved, and the connection method of the copper wire is changed so that the two common mode choke coils are electrically separated or electrically coupled to each other. And a common mode choke coil suitable for the BTL connection method can be obtained.

  FIG. 2 shows a case where a common mode choke coil 21 (see FIG. 4) conforming to the BTL connection system is configured by using the two coils shown in FIG. 1, that is, two common mode choke coils comprising a hobbin 11 and a hobbin 12. The perspective view of the external appearance when it is set as the state electrically connected to is shown. By connecting the core cross section 17 and the core cross section 19 and the core cross section 18 and the core cross section 20 of the two U-shaped cores 9 and 10 to each other, the core 9 and the core 10 serve as a rectangular closed magnetic circuit core. The structure is structured. 3 shows a circuit diagram of the common mode choke coil shown in FIG. 2, and FIG. 4 shows a circuit diagram of a BTL connection type output device using the common mode choke coil shown in FIG.

  Here, as shown in FIG. 4, at the time of the BTL connection method, the winding start 13-1 and 14-1 and the winding end 13-2 and 14-2 and the copper wires 15 and 16 of the two copper wires 13 and 14 are connected. The winding start 15-1 and 16-1 and the winding end 15-2 and 16-2 are short-circuited (see FIG. 1), the current capacity is double that of a single common mode choke coil, and the two are combined 1 Two common mode choke coils 21 are configured. The common mode choke coil 21 is connected between the BTL connection type digital amplifier 1 and the latter stage of the low-pass filter of the two output stages and the load speaker 8 as shown in FIG. Mode noise can be removed.

  Next, in FIG. 5, when the common mode choke coil 22 (see FIG. 7) adapted to the SEPP connection method is configured using the two coils shown in FIG. 1, that is, two common modes including the hobbin 11 and the hobbin 12. The perspective view of the external appearance when it is set as the state which isolate | separated the choke coil electrically is shown. The core 9 and the core 10 are separated by making the core cross section 17 and the core cross section 19 and the core cross section 18 and the core cross section 20 of the two U-shaped cores 9 and 10 not face each other. . 6 shows a circuit diagram of the common mode choke coil shown in FIG. 5, and FIG. 7 shows a circuit diagram of an SEPP connection type output device using the common mode choke coil shown in FIG.

  At the time of the SEPP connection method, the winding start 13-1 and 14-1 and the winding end 13-2 and 14-2 of the two copper wires 13 and 14 and the winding start 15-1 and 16-1 of the copper wires 15 and 16 The winding ends 15-2 and 16-2 are not short-circuited, and the core 10 is wound in the bobbin 12 winding axis direction (X-axis direction in FIG. 5) so that the core cross-section 17 and cross-section 19, and the cross-section 18 and cross-section 20 are not joined to each other. As shown in FIG. 6, two independent common mode choke coils are obtained. At this time, the core 9, the bobbin 11, and the bobbin 12 are not moved while being fixed. By connecting this common mode choke coil 22 between the low-pass filter downstream stage of the output stage of the SEPP connection type digital amplifiers 1 and 2 and the load speakers 6 and 7 as shown in FIG. The generated common mode noise can be removed. Further, by separating the core 9 and the core 10, it is possible to reduce the coupling between the two common mode choke coils and to ensure the separation between channels.

  Thus, by setting the short-circuit / non-short-circuit of the copper wire wound around the hobbin and moving the core, a common mode choke coil that can be adapted to both the SEPP connection method and the BTL connection method can be realized. Conventionally, two common mode choke coils, which were required in the past, are provided by two, so that the number of mounting points, work man-hours, management man-hours, and component mounting areas can be reduced.

  The moving direction of the core 10 is set to the X-axis direction shown in FIG. 5 in this embodiment, but the same effect can be obtained even when the moving direction is set to the Y-axis direction or the Z-axis direction by increasing the inner diameter portion of the bobbin 12. Can be obtained. Further, by making the inner diameter portion of the bobbin 12 cylindrical and the portion of the core 10 that contacts the bobbin 12 cylindrical, the core 10 is rotated 90 degrees or 180 degrees about the X axis as shown in FIG. The same effect can be obtained also by making it. Similarly to the core 10, the core 9 is rotated by 90 degrees or 180 degrees opposite to the core 10 about the X axis as a central axis, thereby further improving the inter-channel separation. In order to adapt to the BTL connection method, the state shown in FIG. 8 or 9 is switched to the state shown in FIG. FIG. 10 shows an example of a structure for smoothly rotating the cores 9 and 10 at this time, when the core cross sections 17 and 19, 18 and 20 are joined to each other when viewed from the X-axis direction of FIG. It is a side view and is configured such that the cut line 23 in the YZ plane of the joint surface is oblique.

  Next, a second embodiment of the common mode choke coil according to the present invention will be described. Also in this embodiment, the basic configuration of the two common mode choke coils is the same as in FIG. However, in this embodiment, the correspondence between the BTL connection method and the SEPP connection method is switched by moving both the core and the bobbin. The configuration of the common mode choke coil adapted to the BTL connection method is the same as that in FIG. FIG. 11 shows a perspective view of the appearance when a common mode choke coil adapted to the SEPP connection method is used. While the relative positional relationship between the core 10 and the bobbin 12 is fixed, the core 9 and the core 10 are magnetically separated by shifting them in the X-axis direction. As shown in FIG. Two common mode choke coils are obtained. In this embodiment, the moving direction of the core 10 and the bobbin 12 is the X-axis direction shown in FIG. 11, but the same effect can be obtained even if the moving direction is the Y-axis direction or the Z-axis direction.

  In the first embodiment and the second embodiment, the shapes of the core 9 and the core 10 are U-shaped. However, in this embodiment, the shape of the core is a rectangular shape. FIG. 12 is an external perspective view showing the common mode choke coil in the present embodiment, and shows two common mode choke coils used in the output device. Bobbins 11 and 12 are mounted on the square cores 24 and 25, respectively, to form two common mode choke coils. Similar to the first embodiment, two copper wires 13 and 14 are wound around the bobbin 11 simultaneously in the same winding direction. Two copper wires 15 and 16 are wound around the bobbin 12 simultaneously in the same winding direction. In FIG. 12, -1 is added to the reference and displayed to indicate the winding start of each copper wire, and -2 is added to the reference and displayed to indicate the end of winding of each copper wire. . Using these two coils, the core is moved and the connection method of the copper wire is changed, so that the two common mode choke coils are electrically separated or electrically coupled to each other as a SEPP connection. It is possible to obtain a common mode choke coil suitable for each of the system and the BTL connection system.

  FIG. 13 shows a perspective view of an external appearance when a common mode choke coil conforming to the BTL connection method is configured using the two coils shown in FIG. The circuit diagram of the common mode choke coil in the state of FIG. 12 is the same as FIG. 3, and the circuit diagram of the output device of the BTL connection system using the common mode choke coil in the state of FIG. 12 is the same as FIG.

  Similarly to Example 1, the winding start 13-1 and 14-1 and the winding end 13-2 and 14-2 of the two copper wires 13 and 14 and the winding start 15-1 and 16- of the copper wires 15 and 16 are performed. 1 and winding ends 15-2 and 16-2 are short-circuited, the current capacity is double that of a single common mode choke coil, and the two are combined to form one common mode choke coil 21. Yes. The common mode choke coil 21 is connected between the BTL connection type digital amplifier 1 and the latter stage of the low-pass filter of the two output stages and the load speaker 8 as shown in FIG. Mode noise can be removed.

  FIG. 14 is a perspective view of an external appearance when the common mode choke coil 22 (see FIG. 7) conforming to the SEPP connection method is configured using the two coils shown in FIG. At the time of the SEPP connection method, the winding start 13-1 and 14-1 and the winding end 13-2 and 14-2 of the two copper wires 13 and 14 and the winding start 15-1 and 16-1 of the copper wires 15 and 16 The winding ends 15-2 and 16-2 are not short-circuited, and the core 25 is shifted in the Y-axis direction of FIG. 14 so that the cores 24 and 25 are not joined to each other. Two common mode choke coils are obtained. At this time, the core 25 and the bobbin 12 are fixed. By connecting the common mode choke coil 22 between the low-pass filter downstream of the output stage of the SEPP connection type digital amplifiers 1 and 2 and the load speakers 6 and 7 as shown in FIG. The common mode noise generated from the can be removed. Further, by separating the core 24 and the core 25, it is possible to reduce the coupling between the two common mode choke coils and to ensure the separation between channels.

  Although the movement direction of the core 25 and the bobbin 12 is the Y-axis direction shown in FIG. 14 in the third embodiment, the same effect can be obtained even if the movement direction is the X-axis direction or the Z-axis direction. Further, by making the inner diameter portion of the bobbin 12 cylindrical and making the portion of the core 25 in contact with the bobbin 12 cylindrical, the core 25 is rotated 90 degrees or 180 degrees about the X axis as shown in FIG. The same effect can be obtained.

  Further, similarly to the core 25, the core 24 is further rotated by 90 degrees or 180 degrees about the X axis as a central axis, and the state shown in FIG. 16 is further improved. In order to adapt to the BTL connection method, the state shown in FIG. 15 or FIG. 16 is switched to the state shown in FIG. 13. However, in order to smoothly rotate the cores 24 and 25 as in FIG. You may comprise so that the cut line in YZ plane of the joint surface when the cores 24 and 25 join when it sees from a X-axis direction may become diagonal.

  The common mode choke coil of this embodiment can be moved so that the two common mode choke coils used in the output device can be selected either in an electrically separated state or in an electrically coupled state. In addition, a common core portion that can be magnetically coupled to the cores of the two common mode choke coils is provided.

  A perspective view of the appearance of the basic configuration of this embodiment is shown in FIG. As in FIG. 1 of the first embodiment, bobbins 11 and 12 are mounted on the U-shaped cores 9 and 10, respectively, to form two common mode choke coils. Two copper wires 13 and 14 are wound around the bobbin 11 simultaneously in the same winding direction. Two copper wires 15 and 16 are wound around the bobbin 12 simultaneously in the same winding direction. In the present embodiment, a common core portion 33 is provided, and the common core portion 33 is configured by installing substantially cubic cores 26 and 27 at both ends of a rod-like non-magnetic material 28, and the surface shape of the cores 26 and 27. Are formed so as to substantially coincide with the shapes of the cross-sections 17, 18, 19, and 20 of the cores 9 and 10 that are installed facing each other. In the present embodiment, the common core choke coil adapted to the SEPP connection method and the BTL connection method is obtained by moving the common core portion 33 and changing the connection method of the copper wires.

  FIG. 18 is a perspective view of an appearance when a common mode choke coil conforming to the BTL connection method is configured using the two common mode choke coils and the common core portion 33 shown in FIG. The circuit diagram of the common mode choke coil in the state of FIG. 18 is the same as FIG. 3, and the circuit diagram of the output device of the BTL connection type using the common mode choke coil in the state of FIG. 18 is the same as FIG.

  At the time of the BTL connection method, similarly to the first embodiment, the winding start 13-1 and 14-1 and the winding end 13-2 and 14-2 of the two copper wires 13 and 14 and the winding start 15 of the copper wires 15 and 16 are performed. -1 and 16-1 and winding ends 15-2 and 16-2 are short-circuited, and the cross-section 17 and cross-section 29 of the core, the cross-section 18 and cross-section 30, the cross-section 19 and cross-section 31, and the cross-section 20 and cross-section 32 are joined together. As a result, the core 9, the core 10, the core 26, and the core 27 are combined to form a single closed-loop magnetic core structure, the current capacity is double that of a single common mode choke coil, and the two are combined. Two common mode choke coils are configured. This common mode choke coil is generated from the digital amplifiers 1 and 2 by being connected between the BTL connection type digital amplifier 1 and the low-pass filter of the two output stage and the load speaker 8 as shown in 21 of FIG. Common mode noise can be removed.

  FIG. 19 is a perspective view of an external appearance when a common mode choke coil conforming to the SEPP connection method is configured using the two common mode choke coils and the common core portion 33 shown in FIG. At the time of the SEPP connection method, the winding start 13-1 and 14-1 and the winding end 13-2 and 14-2 of the two copper wires 13 and 14 and the winding start 15-1 and 16-1 of the copper wires 15 and 16 The winding ends 15-2 and 16-2 are not short-circuited, and the common core portion 33 is shifted in the X-axis direction so that the common core portion 33 and the cores 9 and 10 are not joined to each other. Similar two independent common mode choke coils are obtained.

  At this time, the core 9 and the bobbin 11, the core 10 and the bobbin 12 are not moved while being fixed. By connecting this common mode choke coil between the low-pass filter downstream stage of the output stage of the SEPP connection type digital amplifiers 1 and 2 and the load speakers 6 and 7 as shown in FIG. The generated common mode noise can be removed. Further, by separating the core 9 and the core 10, it is possible to reduce the coupling between the two common mode choke coils and to ensure the separation between channels. The same effect can be obtained by moving the core 33 in the Z-axis direction.

  In the fourth embodiment, the common core portion 33 has a rod shape, but the same effect can be obtained even if the common core portion has a toroidal ring shape as shown in FIG. The core 26 and the core 27 are held by semicircular non-magnetic members 34 and 35, and constitute a toroidal ring-shaped common core portion 36. The nonmagnetic materials 34 and 35 are positioned symmetrically with respect to the center line of the toroidal ring. The common core portion 36 and the two common mode choke coils shown in FIG. 17 form one component, and the common core portion 36 is moved and the copper wire connection method is changed to change the SEPP connection method and the BTL connection. A common mode choke coil suitable for each method is obtained. When adapting to the BTL connection method, the cores 26 and 27 are positioned to join the cross sections of the cores 9 and 10, and when adapting to the SEPP connection method, the common core portion 36 is rotated about the central axis of the toroidal ring. The same effect can be obtained by rotating the shafts 26 and 27 so that the cores 26 and 27 are not joined to the cross sections of the cores 9 and 10.

  FIG. 21 is an external perspective view of the basic configuration of the common mode choke coil according to the fifth embodiment of the present invention. The shapes of the bobbins 11 and 12 used in this embodiment, the copper wires 13, 14, 15, 16 wound around the bobbins 11 and 12, and the winding shapes thereof are the same as those shown in FIG. However, in this embodiment, the core passing through the hobbins 11 and 12 is composed of a single rod-shaped composite core 40, and the composite core 40 has a rectangular parallelepiped shape sandwiched between rectangular parallelepiped rod-shaped cores 37 and 38 and cores 37 and 38. The non-magnetic material 39 is used. In the present embodiment, a common mode choke coil that conforms to the SEPP connection method and the BTL connection method is obtained by moving the composite core 40 and changing the connection method of the copper wires 13 and 14, 15, 16.

  FIG. 22 is a perspective view of an external appearance when a common mode choke coil conforming to the BTL connection method is configured in the present embodiment. The connection of the copper wires 13, 14, 15, 16 is set in the same manner as in the case of the BTL connection method of the first embodiment, and the composite core 40 is placed at a position where the core 37 constituting the composite core 40 penetrates the hobbins 11 and 12 simultaneously. By installing the common mode choke, the current capacity similar to that in FIG. 3 is doubled. This common mode choke coil can be used in a BTL connection type output device like the common mode choke coil 21 in FIG. 4 to remove common mode noise generated from the digital amplifier.

  FIG. 23 is a perspective view of an external appearance when a common mode choke coil conforming to the SEPP connection method is configured in the present embodiment. The connection of the copper wires 13, 14, 15, 16 is set in the same manner as in the SEPP connection method of the first embodiment, and the non-magnetic material 39 constituting the composite core 40 is installed between the hobbins 11 and 12, and the core 37 and By moving the composite core 40 so that the core 38 is located inside the hobbin 11 and the hobbin 12, respectively, two independent common mode choke coils similar to those in FIG. 6 are obtained. At this time, the composite core 40 is moved while the relative positions of the hobbins 11 and 12 are fixed. These two common mode choke coils can be used in a SEPP connection type output device like the common mode choke coil 22 in FIG. 7 to remove common mode noise generated from the digital amplifier.

  In the above example, the composite core 40 is rod-shaped, but the same effect can be obtained even if the composite core is a toroidal ring-shaped composite core. FIG. 24 is a plan view showing an example of such a toroidal ring-shaped composite core. The toroidal ring-shaped composite core 45 is composed of semicircular cores 41 and 42 and nonmagnetic materials 43 and 44 sandwiched between them. The nonmagnetic materials 43 and 44 are in positions symmetrical with respect to the center line of the toroidal ring. The composite core 45 is installed so as to pass through the hobbins 11 and 12 similar to those in FIG. 21, and the composite core 45 is moved and the connection method of the copper wire is changed, so that the SEPP connection method and the BTL connection method are respectively provided. Get a compatible common mode choke coil. FIG. 25 and FIG. 26 are plan views showing configurations of common mode choke coils that respectively conform to the BTL connection method and the SEPP connection method.

  As shown in FIG. 25, the composite core 45 in the case of adapting to the BTL connection method is installed at a position where the core 42 constituting the movable core 45 penetrates the inside of the hobbins 11 and 12 simultaneously. When adapting to the SEPP connection method, the same effect can be obtained by installing the non-magnetic material 44 constituting the composite core 45 between the hobbins 11 and 12 as shown in FIG.

  FIG. 27 is an external perspective view of the basic configuration of the common mode choke coil according to the sixth embodiment of the present invention. The shapes of the bobbins 11 and 12 used in this embodiment, the copper wires 13 and 14 wound around the bobbins 11 and 12, and the winding shape thereof are the same as those shown in FIG. Moreover, the common core part which can be magnetically coupled to the core of two common mode choke coils similarly to FIG. 17 of Example 4 is provided. However, in the present embodiment, the common core portion 49 has a columnar shape, and is divided into three by a plane parallel to the central axis thereof, the central portion thereof being a magnetic body 48, and both sides thereof being nonmagnetic bodies 46 and 47. Moreover, the common core part 49 is comprised so that it may rotate with the center axis | shaft. The U-shaped cores 9 and 10 have cross-sections 17, 18, 19, and 20 that are concave in shape, and are formed so as to be fitted with the curved surface of the common core portion 49. Also in this embodiment, the common core choke coil adapted to the SEPP connection method and the BTL connection method is obtained by moving the common core portion 49 and changing the connection method of the copper wire.

  FIG. 28 shows a perspective view of an external appearance when a common mode choke coil conforming to the BTL connection method is configured according to the present embodiment. The connection of the copper wires 13, 14, 15, 16 is set in the same manner as in the case of the BTL connection method of the first embodiment, and the movable core is located at a position where the core cross-sections 17, 18, 19, 20 are joined to the magnetic body 48 of the movable core. Is rotated and installed, the core 9, the core 10, and the magnetic body 48 constitute a closed-circle magnetic path core, and a current capacity similar to that in FIG. This common mode choke coil can be used in a BTL connection type output device like the common mode choke coil 21 of FIG. 4 to remove common mode noise generated from the digital amplifier.

  FIG. 29 is a perspective view of an external appearance when the common mode choke coil 22 conforming to the SEPP connection method is configured according to the present embodiment. The connection of the copper wires 13, 14, 15, 16 is set in the same manner as in the case of the SEPP connection method of the first embodiment, and the common core so that the core cross-section 17, cross-section 18, cross-section 19, cross-section 20 and the magnetic body 48 are not joined. By rotating the portion 49, two independent common mode choke coils similar to those in FIG. 6 are obtained. At this time, the core 9 and the bobbin 11, the core 10 and the bobbin 12 are not moved while being fixed. These two common mode choke coils can be used in a SEPP connection type output device like the common mode choke coil 22 in FIG. 7 to remove common mode noise generated from a digital amplifier.

  In the above example, the common core portion 49 has a three-layer structure in which a magnetic material is sandwiched between non-magnetic materials. However, the common core portion in this embodiment has only both end portions as shown in another example of the core shape of FIG. A cylindrical common core portion 55 that is divided into five parts by a plane parallel to the central axis, the central portion of which is a magnetic body 50, 51, both sides of which are non-magnetic bodies 54, and the outer side thereof are magnetic bodies 52, 53. It may be. In FIG. 30, the center part of the cylinder in the longitudinal direction has a three-layer structure, the center part being a non-magnetic material, and both sides thereof being a magnetic material.

  Also in this case, a common mode choke coil suitable for the SEPP connection method and the BTL connection method is obtained by rotating the common core portion 55 and changing the connection method of the copper wire. The position of the common core portion 55 when adapted to the BTL connection method is such that the magnetic bodies 50 and 51 constituting the common core portion 55 are cross sections 17, 18, 19, 20 of the two cores as shown in the perspective view of FIG. Install it at a position where it joins In this way, a square core is formed by the core 9, the core 10, the magnetic body 50, and the magnetic body 51 to form a closed magnetic circuit structure, thereby obtaining the common mode choke coil of the circuit shown in FIG.

  The position of the common core portion 55 when adapted to the SEPP connection method is such that the outer magnetic bodies 52 and 53 sandwiching the non-magnetic body constituting the common core portion 55 are two cores as shown in the perspective view of FIG. By installing them at positions where they are joined to the cross-sections 17, 18, 19, and 20, the core 9 and the magnetic body 52, and the core 10 and the magnetic body 53 independently form a R-shaped core to form a closed magnetic circuit structure. A common mode choke coil similar to the circuit shown in FIG. Even in the SEPP connection method, since the core has a closed magnetic circuit structure, channel separation is further improved.

As described above, in the present invention, in the output device using a digital amplifier, the connection method can be switched to SEPP connection or BTL connection, and the number of parts, the mounting area, the manufacturing man-hours, and the production control man-hours A common mode choke composite and an output device that can be reduced and can prevent unnecessary radiation due to an unused open pattern are obtained.

  As the core and magnetic material used in the present invention, a metal dust core, a ferrite core or the like can be used, and as the nonmagnetic material, a plastic or a ceramic material can be used. The output components used in the present invention are mainly speakers, earphones, etc. used in audio devices, but are not limited to these, and can be applied to various output devices in which similar circuit configurations are used. .

1 is an external perspective view showing a first embodiment of a common mode choke coil according to the present invention. The perspective view of the external appearance at the time of comprising the common mode choke coil which adapts to the BTL connection system of a 1st Example. The circuit diagram of the common mode choke coil at the time of comprising the common mode choke coil which adapts to the BTL connection system of a 1st Example. The circuit diagram of the output device of a BTL connection system using the common mode choke coil which adapts to the BTL connection system of a 1st Example. The perspective view of the external appearance at the time of comprising the common mode choke coil which adapts to the SEPP connection system of a 1st Example. The circuit diagram of the common mode choke coil at the time of comprising the common mode choke coil which adapts to the SEPP connection system of a 1st Example. The circuit diagram of the output device of the SEPP connection system which uses the common mode choke coil which adapts to the SEPP connection system of the 1st Example. The perspective view of the external appearance of the other example at the time of moving the core of 1st Example and comprising the common mode choke coil which adapts to a SEPP connection system. The perspective view of the external appearance of the other example at the time of moving the core of 1st Example and comprising the common mode choke coil which adapts to a SEPP connection system. The side view which shows the core junction part at the time of comprising the common mode choke coil which adapts to a BTL connection system. The perspective view of the external appearance which shows the case where the common mode choke coil which adapts to the SEPP connection system of the 2nd Example of the common mode choke coil by this invention is comprised. The external appearance perspective view which shows the 3rd Example of the common mode choke coil by this invention. The external appearance perspective view at the time of comprising the common mode choke coil which adapts to the BTL connection system of a 3rd Example. The perspective view of the external appearance at the time of comprising the common mode choke coil which adapts to the SEPP connection system of a 3rd Example. The perspective view of the external appearance of the other example at the time of moving the core of a 3rd Example and comprising the common mode choke coil which adapts to a SEPP connection system. The perspective view of the external appearance of the other example at the time of moving the core of a 3rd Example and comprising the common mode choke coil which adapts to a SEPP connection system. The external appearance perspective view which shows the 4th Example of the common mode choke coil by this invention. The external appearance perspective view at the time of comprising the common mode choke coil which adapts to the BTL connection system of a 4th Example. The external appearance perspective view at the time of comprising the common mode choke coil which adapts to the SEPP connection system of a 4th Example. The other example of a common core part used in a 4th Example. The perspective view of the external appearance which shows the 5th Example of the common mode choke coil by this invention. The perspective view of the external appearance at the time of comprising the common mode choke coil which adapts to the BTL connection system of a 5th Example. The external appearance perspective view at the time of comprising the common mode choke coil which adapts to the SEPP connection system of 5th Example. The top view which shows the other example of the core shape used for a 5th Example. The top view of the external appearance at the time of comprising the common mode choke coil which adapts to the BTL connection system of the other example of the core shape of 5th Example. The top view of the external appearance at the time of comprising the common mode choke coil which adapts to the SEPP connection system of the other examples of the core shape of 5th Example. The external appearance perspective view which shows the 6th Example of the common mode choke coil by this invention. The external appearance perspective view at the time of comprising the common mode choke coil which adapts to the BTL connection system of a 6th Example. The perspective view of the external appearance at the time of comprising the common mode choke coil which adapts to the SEPP connection system of a 6th Example. The perspective view which shows the other example of the core shape used for a 6th Example. The perspective view of the external appearance at the time of comprising the common mode choke coil which adapts a BTL connection system using the other example of the core shape of a 6th Example. The perspective view of the external appearance at the time of comprising the common mode choke coil which adapts a SEPP connection system using the other example of the core shape of a 6th Example. The basic circuit diagram for two channels of the output device by the digital amplifier of a SEPP connection system. The circuit diagram at the time of comprising for one channel of the output device of a BTL connection system using two digital amplifiers. 2 is a circuit diagram in the case where two channels of a conventional SEPP connection type output device and one channel of a BTL connection type output device are configured on the same substrate and are electrically switched. The circuit diagram at the time of using the conventional common mode choke coil in order to implement | achieve the output device 2 channel of a SEPP connection system and the output device 1 channel of a BTL connection system on the same board | substrate in order to make a board | substrate common.

Explanation of symbols

1, 2, Digital amplifier 3, 4, 5, 21, 22 Common mode choke coil 6, 7, 8 Load speaker 9, 10, 24, 25, 26, 27, 37, 38, 41, 42 Core 11, 12 Bobbin 13 , 14, 15, 16 Copper wires 13-1, 14-1, 15-1, 16-1 Start of winding 13-2, 14-2, 15-2, 16-2 End of winding 17, 18, 19, 20, 29, 30, 31, 32 Section 23 Cut line 28, 33, 34, 35, 39, 43, 44, 46, 47, 54 Non-magnetic material 33, 36, 49, 55 Common core part 40, 45 Composite core 48, 50 , 51, 52, 53 Magnetic bodies L1, L2 Inductors C1, C2 Capacitors

Claims (9)

Used in the output device comprising a digital amplifier and the output part, the two Oite common mode choke complex separable into common mode choke coil is inserted into the input side of said output part, wherein the common mode choke complex An open magnetic circuit comprising two cores and a winding portion having two windings formed on the outer periphery of each of the cores, wherein at least one of the core or the winding portions is movable. Or a closed magnetic circuit structure and the winding start and end of the winding are short-circuited or opened so that the two common mode choke coils are electrically separated or electrically coupled. The common mode choke composite is characterized in that it can be selected. Common mode choke composite according to claim 1, wherein only front SL core and being movable. The common mode choke composite according to claim 1, wherein both the core and the winding portion are movable. Used in the output device comprising a digital amplifier and the output part, the two Oite common mode choke complex separable into common mode choke coil is inserted into the input side of said output part, wherein the common mode choke complex It is composed of two cores, a winding portion having two windings formed on the outer periphery of each of the cores, and a common core portion that can be magnetically coupled to the core, and the common core portion can be moved. The core and the common core portion have an open magnetic circuit structure or a closed magnetic circuit structure, and the winding start and end of the winding are short-circuited or opened so that the two common mode choke coils and the common core portion are electrically connected. A common mode choke composite characterized by being configured to be able to select either a state of being electrically separated or a state of being electrically coupled. The common mode choke composite according to any one of claims 1 to 4, wherein the core or the common core portion is configured by combining a non-magnetic material and a magnetic material. 6. The common mode choke composite according to claim 5, wherein the core or the common core portion has a toroidal ring shape. 5. The common core portion has a cylindrical shape, and is divided into three at least at both end portions thereof by a plane parallel to the central axis, the central portion being a magnetic material, and both sides being non-magnetic materials. Common mode choke composite as described. The common core portion has a cylindrical shape, and is divided into five at least at both end portions thereof by a plane parallel to the central axis, the central portion is a magnetic body, both sides thereof are non-magnetic bodies, and the outside thereof is a magnetic body, 5. The common mode choke composite according to claim 4, wherein in a state where the two common mode choke coils are electrically separated, the core of each common mode choke coil constitutes a closed magnetic circuit. An output device comprising the common mode choke composite according to claim 1.

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