JP2007103399A - Common mode choke coil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a common mode choke coil with a high coupling degree between wirings and with less leakage magnetic flux. <P>SOLUTION: In a coil bobbin 3, brims 5 are arranged at both ends and a center of a cylindrical drum part and a part between the ends and the center. The bobbin 3 has a structure divided into two. The coil bobbin 3 is engaged into a magnetic path of a square or elliptic closed magnetic path magnetic core 100. Division windings 1a, 1b, 1c and 1d are given to respective winding frames 5a, 5b, 5c and 5d. The choke coil is provided with a seating 2 for storing the closed magnetic path magnetic core 100 and the coil bobbins 3 and a terminal for connecting division windings 1a, 1b, 1c and 1d. Connection conductors 200 and 300 for connecting division windings 1a, 1b, 1c and 1d in series are arranged inside the seating 2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a common mode choke coil suitable for use in consumer and industrial electronic devices.

  A common mode choke coil is an electronic component that a user inserts into a power supply line or the like of an electronic device having a switching power supply or the like therein to suppress electrical and electromagnetic noise of common mode noise (unbalanced mode noise).

  FIG. 3 is an explanatory diagram of a conventional common mode choke coil. 3A is a front view of the common mode choke coil, FIG. 3B is a side view, and FIG. 3C is a bottom view. FIG. 4 is a wiring diagram of the windings of the conventional common mode choke coil shown in FIG.

  A conventional common mode choke coil has a coil bobbin fitted to a closed magnetic circuit core, and a coil formed on the side surface of the coil bobbin is used to wind each winding frame in the same direction, and to each designated terminal. A winding lead portion is connected.

  FIG. 4 is a wiring diagram of the windings of the conventional common mode choke coil shown in FIG. FIG. 4A is a wiring diagram of the whole winding, and FIG. 4B is a wiring diagram in the case of split winding. In the case of the divided winding wiring as shown in FIG. 4B, there is a problem that the coupling between the coils of the divided winding is low and the leakage inductance is increased.

  In the common mode choke coil having the conventional structure as shown in FIG. 3, the ratio (Ln / Lc) between the normal mode inductance Ln and the common mode inductance Lc generated by the leakage magnetic flux is about 1.5 to 1.8%. . As an example, if the core is a non-divided common mode choke coil with a rectangular shape and Mn—Zn ferrite material, and the common mode inductance Lc is 1 mH, the normal mode inductance Ln is about 17 μH.

  Patent Document 1 describes a common mode choke coil in which a winding is wound around each winding frame using a gear.

JP-A-6-333757

  Conventional common mode choke coils are mainly used for the purpose of suppressing electromagnetic noise, and the size of normal mode inductance generated by leakage magnetic flux or the like has not been limited in the standard.

  However, in recent years, studies have been made on the promotion of high-speed power line communication using power lines. Studies are underway to reduce this.

  The reason why the normal mode inductance is generated is that the degree of coupling between the windings is low and the inductance is not balanced. Therefore, the technical problem of the present invention is to provide a common mode choke coil having a high degree of coupling between windings and a low leakage flux.

  The present invention has both ends and a central portion of a cylindrical body portion of a coil bobbin provided with a rotational driving gear on at least one end face, and a winding frame portion formed by placing a flange between both ends and the central portion. The coil bobbin that can be divided into two in the cylindrical axis direction is loosely fitted to the magnetic path of the magnetic core, the divided winding is applied to each of the winding frame portions, and the base and the divided winding for storing the magnetic core and the coil bobbin are provided. The present invention relates to a common mode choke coil provided with a terminal for connecting in series a terminal of a split winding wound alternately inside the pedestal.

  That is, the present invention includes a magnetic core, both ends and a center portion of the cylindrical body, a coil bobbin in which a flange is disposed between both ends and the center, and a plurality of coils wound in a winding frame surrounded by the flange. In the common mode choke coil composed of the divided winding, pedestal, and terminal, the coil bobbin can be divided into two, and the coil bobbin has a square-shaped closed magnetic circuit core or an oval shape. And the pedestal stores the magnetic core and the coil bobbin, and the divided winding is connected to a terminal provided on the pedestal, and the order of the winding frames is When A, B, C, and D are taken from one end of the coil bobbin, the divided winding of the A winding frame, the divided winding of the C winding frame, the divided winding of the B winding frame, and the winding of D The divided windings of the frame are connected in series by connecting conductors provided inside the pedestal, respectively. It is a common-mode choke coil.

  Further, the present invention is a common mode choke coil in which the plurality of divided windings are all wound in the same direction.

  The present invention enables a common mode choke coil having a high degree of coupling between coils and a low leakage flux by being alternately divided and wound around a bobbin winding frame. In addition, each divided winding can be simultaneously wound by a gear, and in addition to the input / output connection terminals, the divided winding terminals, which are alternately wound, are connected in series to the base. By providing this terminal, it is possible to prevent the crossing of lines between different poles.

  Therefore, according to the present invention, it is possible to provide a common mode choke coil having a high degree of coupling between windings and a small leakage magnetic flux.

  The common mode choke coil of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory diagram of a common mode choke coil according to an embodiment of the present invention. 1A is a front view of a common mode choke coil, FIG. 1B is a side view, and FIG. 1C is a bottom view.

  The common mode choke coil of the present invention is surrounded by the closed magnetic path magnetic core 100, the coil bobbin 3 in which the flange 5 is disposed between both ends and the center of the cylindrical body, and both ends and the center, and the flange 5. Common mode choke composed of a plurality of divided windings 1a, 1b, 1c, 1d wound in a winding frame, a pedestal 2, and terminals 7, 8, 9, 10, 11, 12, 13, 14 It is a coil. Here, the coil bobbin 3 has a structure that can be divided into two, and the coil bobbin 3 is fitted into the magnetic path of the square-shaped closed magnetic circuit core 100 or the elliptical closed magnetic circuit core 100; Each of the winding frames is provided with divided windings 1a, 1b, 1c, and 1d, and the pedestal 2 stores the closed magnetic circuit core 100 and the coil bobbin 3, and the plurality of divided windings 1a, 1b, and 1c. , 1d are respectively divided windings. Further, terminals 7, 8, 9, 10, 11, 12, 13, 14 for connecting the divided windings 1 a, 1 b, 1 c, 1 d are provided on the pedestal 2, and the windings are provided inside the pedestal 2. Connection conductors 200 and 300 for connecting the lines in series are provided. The plurality of divided windings 1a, 1b, 1c, 1d are all wound in the same direction, and when the winding frame is set to A, B, C, D from one end of the coil bobbin, The divided winding of the first inductor enters the C winding frame from the A winding frame, and the divided winding of the second inductor enters the D winding frame from the B winding frame.

  As shown in FIG. 1, the coil bobbin 3 has a structure that is divided into upper and lower portions with a major axis center plane as a boundary. The coil bobbin 3 is fitted on one side of the square closed magnetic path magnetic core 100 and can be rotated about the axis. When the divided coil bobbin 3 is assembled to be fitted to the magnetic core, the concave and convex portions of the divided surface of the coil bobbin 3 are combined and integrated. In addition, the coil bobbin 3 in which one side of the closed magnetic path magnetic core 100 is incorporated as an axis is incorporated in a recess formed in the central portion on the base 2 so that the rotation cannot be prevented. The rotational power is transmitted from the outside through the gear 4 formed on the side surface of the flange 5 at least at one end of the coil bobbin 3.

  In other words, by employing the configuration shown in FIG. 1, the split winding can be obtained by winding only the coil bobbin 3 while rotating the gear 4 around one side of the closed magnetic path magnetic core 1, thereby rotating each coil bobbin 3. The windings 5a, 5b, 5c, 5d divided by 5 are evenly wound.

  As shown in FIG. 1, on the base 2, external connection terminals 7, 8, 13 for easily connecting the terminals of the divided windings 1a, 1b, 1c, 1d wound around the coil bobbin 3 to the outside. , 14 and internal connection terminals 9, 10, 11, 12 for relaying between the alternately wound divided windings 1a, 1b, 1c, 1d.

  Furthermore, the connection conductors 200 and 300 for connecting the internal connection terminals 9 and 11 and 10 and 12 are press-fitted and fixed in grooves provided in the lower part of the base.

  FIG. 2 is a wiring diagram of the windings of the common mode choke coil of the present invention shown in FIG. As shown in FIG. 2, the divided windings 1a and 1b form one inductor, and the divided windings 1c and 1d form another inductor.

  In this way, the divided windings 1a and 1b forming one inductor are alternately arranged with respect to the divided windings 1c and 1d forming the other inductor and the direction of the magnetic path. By alternately arranging the divided windings, the inductance balance of the two inductors is improved.

  Further, as shown in FIG. 1A, the divided winding 1a is wound around the winding frame 5a, the divided winding 1b is wound around the winding frame 5c, and the divided winding 1c is wound around the winding frame 5b. The divided winding 1d is wound around the winding frame 5d.

  The common mode inductance Lc and normal mode inductance Ln of the common mode choke coil of the present invention shown in FIG. 1 and the conventional common mode choke coil shown in FIG. 3 were as follows.

1) In the case of a conventional common mode choke coil, Lc = 0.62 mH, Ln = 10.3 μH
2) In the case of the common mode choke coil of the present invention, Lc = 0.61 mH, Ln = 2.8 μH

  However, the specifications of the magnetic core, the number of windings, and the copper wire specifications were the same. In this case, magnetic core material: ferrite 5H (manufactured by NEC TOKIN), number of turns N = 20T (aligned uniform winding), copper wire specification: Φ0.55 UEW (polyurethane-coated copper wire) was used.

  From the above results, it can be seen that when the coils are alternately wound around the winding frame as in the present invention, the normal mode inductance Ln is remarkably reduced without significantly affecting the common mode inductance Lc.

  The common mode choke coil of the present invention can be used for prevention of electrical noise generated from power supply lines of home appliances and electronic devices, balanced mode communication by power line communication, and the like.

Explanatory drawing of the common mode choke coil by embodiment of this invention. 1A is a front view of a common mode choke coil, FIG. 1B is a side view, and FIG. 1C is a bottom view. The wiring diagram of the winding of the common mode choke coil of this invention of FIG. Explanatory drawing of the conventional common mode choke coil. 3A is a front view of the common mode choke coil, FIG. 3B is a side view, and FIG. 3C is a bottom view. The wiring diagram of the winding of the conventional common mode choke coil shown in FIG. 4A is a wiring diagram of the entire winding, and FIG. 4B is a wiring diagram in the case of a split winding.

Explanation of symbols

1a, 1b, 1c, 1d, 1e, 1f, 1g, 1h Divided winding 2 Base 3 Coil bobbin 4 Gear 5 鍔 5a, 5b, 5c, 5d, 51a, 51b, 51c, 51d Reel 6 Standoffs 7, 8, 13, 14, 15, 16, 17, 18 (For external connection) Terminals 9, 10, 11, 12 (For internal connection) Terminals 100, 101 Closed magnetic circuit core 200, 300 Connection conductor

Claims (2)

  A magnetic core, both ends and a center of the cylindrical body, a coil bobbin in which a flange is disposed between both ends and the center, and a plurality of divided windings wound in a plurality of winding frames surrounded by the flange In the common mode choke coil comprising a pedestal and a terminal, the coil bobbin has a structure that can be divided into two, and the coil bobbin has a square-shaped closed magnetic circuit core or an elliptical closed magnetic circuit core. Fitted to the path, the pedestal houses the magnetic core and the coil bobbin, the divided windings are applied to the respective winding frames, the divided windings are connected to terminals provided on the pedestal, and every other The common mode choke coil, wherein the divided windings wound around the winding frame are connected in series by connecting conductors provided inside the pedestal, respectively.   The common mode choke coil according to claim 1, wherein the plurality of divided windings are all wound in the same direction.

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