JP5463242B2 - Inductance element - Google Patents

Description

  The present invention relates to an inductance element in which a soft magnetic core is wound.

  As an inductance element, for example, Patent Document 1 discloses a noise filter for reducing common mode noise, which can suppress a reduction in normal mode noise reduction effect without depending on current. In order to provide, a first magnetic core portion that is formed of a first portion and a second portion and has an annular shape, and a second magnetic core portion that divides an opening formed by the first magnetic core portion, And a pair of signal lines wound around the first part and the second part, respectively, and a control line wound around the second magnetic core part, and the second magnetic core part has two through holes. The second magnetic core portion has a middle foot portion sandwiched between two through holes, and a pair of common portions extending between the boundary portions of the first portion and the second portion, A noise filter with a control line wound around the middle foot is disclosed It has been.

JP 2009-135225 A

  However, although the technology described in Patent Document 1 can prevent magnetic saturation with respect to normal mode noise, two through holes are provided in the second magnetic core portion that divides the opening formed by the first magnetic core portion. There is a problem that it is necessary to provide the winding and to perform winding, which becomes an obstacle in actual mass production. In addition, constant power is always consumed by the control line wound around the second magnetic core portion, and standby power is large. In addition, since a magnetic core is inserted into the inner diameter part of the winding, a certain insulation distance is required, but at the same time, the winding frame of the coil winding part is reduced, and there is a problem that it is difficult to obtain high characteristics for both common and normal.

  Accordingly, it is an object of the present invention to provide an inductance element that has high productivity and does not induce magnetic saturation and does not require standby power.

In order to solve the above problems, the present invention includes a magnetic core having soft magnetism, a core case containing the magnetic core, and two or more coils wound around the core case, and has a magnetic property having soft magnetism. A magnetic flux adjusting plate having a body piece attached to a mounting plate is further provided, and a gap between the two coils is provided by restricting an end of the coil by a convex portion provided in the core case, The gap is 1/6 or more and 5/18 or less of the magnetic path length, and the magnetic path generated in the magnetic core when the individual coils are energized is the same, and is used for both adjacent two coils. during the time of performing the energization, the are two orientations are opposite der each other of the magnetic flux generated in the magnetic body core in the gaps between the coils, among the plurality of the gap, and one of the gap, apart from the gap To connect the other gap, Wherein the core case the magnetic flux adjusting plate is fitted, the magnetic piece is a magnetic sheet containing mainly binder with magnetic powder and flexibility, characterized that you have been fixed by adhesive to said magnetic flux adjusting plate An inductance element is provided.

  Examples of the inductance element include an element having an inductance obtained by applying a coil to a magnetic core, specifically, a choke coil, a normal mode choke coil, a common mode choke coil, a transformer, and the like.

  For example, when no common mode noise is generated in a common mode choke coil, magnetic fluxes in opposite directions are generated in the magnetic core due to energization of the two coils. There is no.

  However, by separating the two coils by 1/6 or more and 5/18 or less of the magnetic path length, leakage magnetic flux is generated from the gap between the two coils, and an inductance that suppresses normal mode noise can be set. .

  For example, when a coil is added to a common mode choke coil, three coils are required, and coils corresponding to multiples of 2 are required for countermeasures against common mode noise in a plurality of circuits. Therefore, an inductance element having two or more coils is required. Even so, the present invention does not lose its efficacy.

  In addition to the common mode choke coil described above, for example, in order to prevent magnetic saturation due to the DC superimposed current applied to the coil, the magnetic flux generated in the magnetic core due to the DC superimposed current is generated in a direction to cancel. The present invention can also be applied to a case where a so-called magnetic bias is applied to another coil.

  Since there is a slight leakage magnetic flux from the magnetic core in the inductance, the leakage magnetic flux can be induced by the magnetic flux adjusting plate fitted in the core case, and the self-inductance and mutual inductance of the inductance element can be adjusted.

  It is desirable to fix the magnetic body piece to the magnetic flux adjusting plate by adhesion. By sticking and fixing, the work time for fixing the magnetic body piece to the magnetic flux adjusting plate can be shortened. Moreover, since it is adhesively fixed, it is possible to remove the magnetic piece or cut the magnetic piece on the plate surface to remove a part of the unnecessary magnetic piece.

  Furthermore, the magnetic flux adjusting plate is arranged by arranging magnetic pieces along the path of the leakage magnetic flux so as to connect one of the plurality of gaps and the other gap apart from the gap. Magnetic flux is further induced to enable adjustment of the normal mode inductance.

  In order to solve the above problems, the present invention provides an inductance element further including a protrusion on the magnetic flux adjusting plate and a locking claw on the core case, and engaging the protrusion and the locking claw.

  By using the detachable mechanism, the adjusted inductance can be adjusted again.

  Moreover, this invention provides the inductance element characterized by the said magnetic body piece being cut | disconnected with a blade, in order to solve the said subject.

  By using a blade such as a cutter or a scissors and using a magnetic sheet that can be cut manually or by a cutting facility, the workability in the cutting process of the magnetic piece for adjusting to the target inductance is improved.

In order to solve the above-mentioned problems, the present invention provides an inductance element in which the magnetic piece is detachably mounted on the outer peripheral surface of the gap in the core case or on the mounting plate. To do.

In order to induce the leakage magnetic flux, the magnetic piece is placed on a mounting plate that connects one of the plurality of gaps and another gap apart from the gap without providing a magnetic flux adjusting plate. It only has to be attached. In order to suppress the leakage magnetic flux conversely, for example, when the leakage magnetic flux is excessively induced by the magnetic flux adjusting plate, a magnetic piece may be attached on the outer peripheral surface of the gap.

It is a front view of the inductance element of the present invention. FIG. 2 is a cross-sectional view of the inductance element taken along line AA in FIG. 1. It is an assembly drawing of the inductance element of the present invention. It is a front view of the inductance element of the present invention.

  Embodiments of the present invention will be described below.

  FIG. 1 is a front view of an inductance element of the present invention. A coil 21 is wound around the winding portion 11 of the core case, and the coil 22 is also wound from both ends of the coil 21 via gaps 161 and 162. Since the core case contains a toroidal core having soft magnetism, and a magnetic flux is generated around the soft toroidal core by energizing the coils 21 and 22, the magnetic path is a path of magnetic flux. Similarly, it goes around the inside of the toroidal core having soft magnetism. When the magnetic flux generated in the magnetic core due to the energizing current to the coil 21 and the magnetic flux generated in the magnetic core due to the energizing current to the coil 22 are opposite to each other in the immediate vicinity of the gaps 161 and 162, the normal mode When inductance occurs and they are in the same direction, common mode inductance occurs. When the gap is 1/6 or more of the core magnetic path length, the inductance in the normal mode increases, and by setting the gap to 5/18 or less of the core magnetic path length, a decrease in inductance in the common mode is suppressed.

  Further, one end of the coil 21 is regulated by a winding regulating portion 15 which is a projection provided on the core case, and the other end is similarly regulated by a projection provided on the core case. The same applies to both ends of the coil 22.

  In addition, one end of the conductive wire of the coil 21 is removed from the insulation coating, and used as a connection terminal 211 by solder plating or the like. Since the position of the connecting terminal 211 is restricted by the terminal restricting portions 13 and 14 that are protrusions provided on the core case, the displacement of the connecting terminal 211 when mounting on the circuit board is restricted. Similarly, the other end of the conductive wire of the coil 21 and both ends of the conductive wire of the coil 22 are also used as connection terminals, and the position of the connection terminal is restricted by the terminal restricting portion.

  On the other hand, the magnetic flux adjusting plate having the magnetic piece 31 adhered to the plate surface of the mounting plate 3 is fitted into the core case so as to connect between the gap 161 and the gap 162. Furthermore, the position of the mounting plate 3 in the width direction of the mounting plate 3 is regulated by the inner peripheral surfaces of the gaps 161 and 162 and the thickness of the mounting plate 3 is controlled by the mounting plate restricting portion 12 that is a protrusion provided on the core case. The position is regulated. If the mounting plate 3 is an insulator, it is desirable because the insulation between the coil 21 and the coil 22 can be reliably ensured.

  FIG. 2 is a cross-sectional view taken along line AA of the inductance element in FIG. The magnetic core 113 is accommodated by a core case upper part 111 and a core case lower part 112, and a stopper 121 is provided at the bottom of the core case lower part 112 to connect the inner peripheral surface of the core case. 122 stands up toward the upper part of the core case, and locking claws 123 are respectively provided inside the two elastic columns 122.

  On the other hand, the mounting plate is provided with a through hole 32 at the top, a locking projection 33 at the bottom on both sides of the mounting plate 3, and a wide head 34. Since the locking projection 33 has a structure in which the hook portion provided on the other side is engaged with the projection provided on one side by the locking claw 123 of the core case, the mounting plate can be repeatedly attached and detached. In particular, when removing the mounting plate, the wide head 34 may be pulled with a hand or tweezers, or may be pulled with a claw or the like caught in the through hole 32.

  FIG. 3 is an assembly diagram of the inductance element of the present invention. The connection terminal 211 at one end of the conducting wire of the coil 21 and the connection terminal 212 at the other end are arranged on the left and right sides of the page, that is, on the front and back surfaces in the core case thickness direction. The same applies to the coil 22.

  A magnetic flux adjusting plate provided with a magnetic piece 31, a through hole 32, a locking projection 33, and a head 34, and the magnetic piece 31 provided at the lower portion of the through hole 32 is inserted from the left side of the page, that is, from the upper portion of the core case. When the magnetic piece 31 is positioned at the center of the magnetic core when inserted, the leakage magnetic flux from the magnetic core can be drawn to the maximum.

  Also, if there is too much leakage magnetic flux from the gaps 161 and 162, as shown in the front view of the inductance element of the present invention in FIG. By attaching the magnetic flux, the leakage magnetic flux can be pulled back to the magnetic core.

  Note that the magnetic flux adjusting plate can be detachably fixed by means such as adhering the magnetic flux adjusting plate to the core case without being engaged by the locking protrusion 33 and the locking claw 123 of the core case.

  In addition, as the magnetic piece, a ferrite plate or the like may be used. For example, when a magnetic sheet mainly containing a magnetic powder and a flexible binder is used, cutting with a blade is possible, and scissors and cutters are used. This is desirable because the inductance can be adjusted easily.

Example 1
In the inductance element having the configuration of FIG. 1, the magnetic flux adjusting plate is not inserted, and the angle formed by the coil 21 and the coil 22 with respect to the center line connecting the central portion of the gap 161 and the central portion of the gap 162, ie, the magnetic path length When the inductance is measured by regulating the winding restricting portion 15 over 1/6 of the whole, the magnetic flux generated in the magnetic core by energization of the coil 21 and the magnetic flux generated in the magnetic core by energization of the coil 22 are in the same direction. The inductance in the common mode becomes 12.4 mH, and the inductance in the normal mode in which the magnetic flux generated in the magnetic core by energization of the coil 21 and the magnetic flux generated in the magnetic core by energization of the coil 22 is set to 70 μH. did it. Furthermore, when the inductance in the normal mode was measured by superimposing a DC current of 2 A, it was not reduced by more than 10% from the inductance when the DC current was not superimposed.

(Example 2)
In the inductance element having the configuration shown in FIG. 1, the winding regulating portion is inserted over an angle of 50 degrees with respect to the vertical direction of the paper, that is, 5/18 of the entire magnetic path length, without inserting a magnetic flux adjusting plate. 15 and the inductance was measured, the inductance in the common mode was set to 12.4 mH, and the inductance in the normal mode could be set to 80 μH. Furthermore, when the inductance in the normal mode was measured by superimposing a DC current of 2 A, it was not reduced by more than 10% from the inductance when the DC current was not superimposed.

(Example 3)
In the inductance element having the configuration shown in FIG. 1, when a magnetic flux adjusting plate is inserted, the coil 21 and the coil 22 are regulated by the winding regulating unit 15 at an angle of 50 degrees with respect to the vertical direction of the paper, and the inductance is measured. The inductance in the mode was adjusted to 12.4 mH, and the inductance in the normal mode was adjusted to 90 μH, which is 10 μH higher than that in Example 2. Furthermore, when the inductance in the normal mode was measured by superimposing a DC current of 2 A, it was not reduced by more than 10% from the inductance when the DC current was not superimposed.

Example 4
In the inductance element having the configuration of Example 2, the cross-sectional area was cut by 10% from the magnetic core of Example 2, and the inductance in the normal mode was measured to be 70 μH. Next, when the magnetic flux adjusting plate was inserted, the inductance in the normal mode could be set to 80 μH.

(Example 5)
In the inductance element having the configuration of Example 2, when the cross-sectional area was cut by 5% from the magnetic core of Example 2 and the inductance in the normal mode was measured, it was 75 μH. Next, when the magnetic flux adjusting plate was inserted, the inductance in the normal mode could be set to 85 μH. Further, when the magnetic flux adjusting plate was removed, a part of the magnetic piece was excised, and the magnetic flux adjusting plate was inserted again, the inductance in the normal mode could be set to 80 μH.

(Comparative Example 1)
In the inductance element having the configuration shown in FIG. 1, the magnetic flux adjusting plate is inserted, and the coil 21 and the coil 22 are moved by the winding restricting portion 15 over an angle of 20 degrees with respect to the vertical direction of the paper, that is, 1/9 of the magnetic path length. When the inductance was measured after regulation, the inductance in the common mode was 12.4 mH, and the inductance in the normal mode was 60 μH.

11 Winding part
111 Core case top
112 Lower core case
113 Magnetic core
12 Mounting plate restricting part
121 Stopper
122 Elastic Column
123 Locking claw
13, 14 Terminal restriction part
15 winding regulation
161, 162 gap
21, 22 Coil
211, 212 connection terminals
3 Mounting plate
31 Magnetic pieces
32 Through hole
33 Locking projection
34 head
35 Magnetic pieces

Claims (3)

A magnetic flux adjusting plate comprising a magnetic core having soft magnetism, a core case containing the magnetic core, and two or more coils wound around the core case, and a magnetic piece having soft magnetism attached to the mounting plate Further, the gap between the two coils is provided by restricting the end of the coil by a convex part provided in the core case, and the gap between the coils is not less than 1/6 of the magnetic path length. The magnetic paths generated in the magnetic core when energizing each of the coils that are equal to or less than / 18 are the same. When energizing both the two adjacent coils in use, the two coils orientation opposite der each other of the magnetic flux generated in the magnetic body core in the gap between is, among the plurality of the gap, so that connects with one of the gap, and another of said gap away with the gap, the core The magnetic flux adjustment plate is fitted to the case , The magnetic piece, a coupling material having a magnetic powder and flexibility in the magnetic sheet containing mainly the inductance element characterized that you have been fixed by adhesive to said magnetic flux adjusting plate. The inductance element according to claim 1 , further comprising a protrusion on the magnetic flux adjusting plate and a locking claw on the core case, wherein the protrusion and the locking claw are engaged with each other. The inductance element according to claim 1 , wherein the magnetic piece is detachably attached to an outer peripheral surface of the gap in the core case or the attachment plate .

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