JP2006032659A - Line filter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a line filter low in height and high in the accuracy of a terminal position with respect to a circuit board in relation to a line filter. <P>SOLUTION: In a case 17 for accommodating two coils 12a, 12b, there are provided two side plates 15 protruded upward from a bottom plate 18 and an intermediate plate 16 such that the inner surface side of the bottom plate 18 of the case makes contact with bottom surfaces of the coils 12a, 12b on a terminal side. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a line filter for primary side noise countermeasure used for a power supply for facility lighting.

  In general, a line filter is mainly used to prevent a common mode noise component generated between a pair of power lines and a ground, and an electric circuit thereof is configured as shown in FIG. That is, 81 is a closed magnetic path magnetic core, and windings 82 and 83 are provided so that the magnetic flux generated by the line current does not magnetically saturate the closed magnetic path magnetic core 81. It arrange | positions in the direction which cancels out the generated magnetic flux.

  Next, an example of a specific structure is shown in FIG. 9, where (a) shows a cross-sectional view thereof and (b) shows a perspective view thereof.

  In the figure, 97 is a case made of a resin such as polybutylene terephthalate, and is composed of both side plates 95 projecting downward from the top plate 97a and an intermediate plate 96 projecting downward in the middle, and the cross section is E-shaped. It is the shape of. And the coil part 92a and the coil part 92b are integrated in the E-shaped case 97 so that the intermediate plate 96 may be fitted.

  Here, the coil portions 92a and 92b are composed of coil bobbins 93a and 93b made of thermosetting resin such as phenol resin having hollow portions 91a and 91b and windings 94a and 94b made of insulating coating copper wire, The winding 94a of the coil portion 92a and the winding 94b of the coil portion 92b are configured so that the winding directions are opposite and the number of turns is the same.

  Further, the coil bobbins 93a and 93b are provided with windings 94a and 94b, wound around metal terminals 90 provided on the bottom surfaces of the coil bobbins 93a and 93b, and connected and fixed by solder dip.

  At this time, the coil portions 92a and 92b are assembled so that the inner surface side of the top plate 97a of the case 97 is in contact with the upper surface side of the coil portions 92a and 92b, that is, the case 97 covers the coil portions 92a and 92b.

  Next, in the hollow portions 91a and 91b provided in the coil bobbins 93a and 93b of the coil portions 92a and 92b, two U-shaped closed magnetic circuit cores 99 made of ferrite or the like are inserted from both sides, and stainless steel or the like. A core band 100 made of a metal plate for a spring is attached to the outer periphery of the closed magnetic path magnetic core 99 and one side plate 95, whereby the case 97 and the closed magnetic path magnetic core 99 are integrally held.

  Further, on both side surfaces of the coil bobbins 93 a and 93 b, fitting grooves 101 are provided on the surface of the case 97 in contact with the side plate 95. The fitting projection 102 is provided so that the case 97 is fitted when the coil portions 92a and 92b are assembled.

  With such a configuration, two windings can be efficiently arranged on one magnetic path, so that the space factor is excellent and the inductance value can be improved. Further, since the cross-sectional shapes of the magnetic core and the coil bobbin can be made the same shape, there is no useless space between the magnetic core and the coil bobbin, which is suitable for low profile.

As prior art document information related to the invention of this application, for example, Patent Document 1 is known.
Japanese Patent No. 2673321

  This type of conventional line filter has to be built in a case. The purpose of this is to ensure an insulation distance for mainly protecting the winding portion through which a current flows.

  However, with the improvement of thin film processing technology for insulating films such as polypropylene and nylon, the insulation method has changed from a method for securing an insulation distance to each component to a method for insulating each component with a film. Due to such changes in the technical background, it has become more important to reduce the height of each component than to secure an insulation distance for each component.

  The conventional line filter has a structure that makes it difficult to reduce the height of the case because the case top plate is an indispensable component.

  Furthermore, since this type of conventional line filter has a structure in which two coil portions are held from the top, even if held in a horizontal direction with a core band or the like, the terminal position may be shifted with respect to the circuit board. It was something that would end up. Although the bottom plate in the conventional example also has a function of ensuring insulation, it does not have a function of holding the terminal position, and thus has a problem of causing a problem at the time of mounting due to the terminal position shift.

  The present invention solves the above-described conventional problems, and an object thereof is to provide a line filter with a low profile and high terminal position accuracy.

  In order to achieve the above object, the present invention is characterized in that the coil portion is held from the bottom side by fixing the both side plates and the intermediate plate of the case housing the coil portion on the bottom plate side. It is what has.

  According to the above-described characteristic configuration, the present invention can reduce the height by removing the top plate that covers the coil portion from above as in the prior art.

  Further, since there is no terminal position deviation with respect to the circuit board as in the prior art, it is possible to eliminate a problem during mounting.

(Embodiment 1)
1 is a sectional view of a line filter according to a first embodiment of the present invention, FIG. 2 is a perspective view, and FIGS. 3 to 6 are schematic perspective views of assembly.

  1 to 5, reference numeral 17 denotes a case made of a resin such as polybutylene terephthalate, which is composed of a side plate 15 and an intermediate plate 16 and a bottom plate 18 located between the side plates 15. The intermediate plate 16 is held and has an E-shaped cross section. And the coil part 12a and the coil part 12b are integrated in the E-shaped case 17 so that the intermediate | middle board 16 may be pinched | interposed.

  Here, the coil parts 12a, 12b are composed of coil bobbins 13a, 13b made of thermosetting resin such as phenol resin having hollow parts 11a, 11b and windings 14a, 14b made of insulating coating copper wire, The winding 14a of the coil portion 12a and the winding 14b of the coil portion 12b are configured so that the winding directions are opposite and the number of turns is the same.

  The coil bobbins 13a and 13b are provided with windings 14a and 14b, wound around the metal terminals 10 provided on the bottom surfaces of the coil bobbins 13a and 13b, and connected and fixed by solder dip.

  The coil portions 12a and 12b provided with the windings 14a and 14b are connected to the case 17 in which a storage portion is formed between the both side plates 15 and the intermediate plate 16 on the inner surface side of the bottom plate 18 and the terminal side of the coil portions 12a and 12b. Install it so that it touches the bottom.

  That is, the configuration of the conventional example is a configuration in which the upper surfaces of the coil portions 92a and 92b (the surface opposite to the surface on which the metal terminals 90 are provided) are in contact with the inner surface of the top plate 97a of the E-shaped case 97. On the other hand, the configuration of the present embodiment is characterized in that the lower surface side (surface on which the metal terminal 10 is provided) of the coil portions 12 a and 12 b is in contact with the inner surface side of the bottom plate 18 of the E-shaped case 17. have.

  Next, in the hollow portions 11a and 11b provided in the coil bobbins 13a and 13b of both the coil portions 12a and 12b, two U-shaped closed magnetic circuit cores 19 made of ferrite or the like are inserted from both sides, and The case 17 and the closed magnetic circuit core 19 are integrally held by attaching a core band 20 made of a metal plate for spring such as stainless steel to the outer periphery of the closed magnetic circuit core 19 and one side plate 15.

  If necessary, as shown in FIG. 6, the vicinity of the region (adhesion region) 20a where the case 17 and the core band 20 are in contact is fixed with an adhesive or the like.

  As described above, according to the present embodiment, the following effects can be obtained only by adopting a characteristic configuration in which the case 97 holds the coil portions 92a and 92b from the bottom side from the configuration of the conventional example.

  First, according to the present embodiment, in the conventional configuration, in FIG. 9, the coil portions 92a and 92b are held so as to cover the case 97 from the top, so that a top plate is necessary for the configuration. However, according to the present embodiment, the top plate is unnecessary, and the height can be reduced. Originally, when the terminals of the coil portion 92a and the winding 94a are joined by solder, a certain gap is required at the bottom of the coil bobbin 93a as a so-called solder escape region for soldering. According to the present embodiment, a member for holding the case 17 in this gap, that is, the bottom plate 18 is arranged, so that the so-called solder escape region and the holding member arrangement space for the case 17 can be effectively utilized. It is.

  Further, according to the conventional configuration, the coil portions 92a and 92b are incorporated in the case 97, and Joule heat generated from the coil portions 92a and 92b is accumulated in the line filter, and as a result, reliability as a component is obtained. It was causing sex decline.

  However, according to the present embodiment, since there is no top plate, the heat dissipation performance is remarkably improved and the reliability of the parts can be improved.

  Further, according to the conventional configuration, since the two coil portions 92a and 92b are held from the top by the case 97, even if the core band 100 or the like is held from the side, the terminal position is shifted with respect to the circuit board. However, according to the present embodiment, since the configuration is such that the two coil portions 12a and 12b are held in close proximity to each other, the terminal position accuracy does not occur and the terminal position accuracy is remarkably improved. To do.

  FIG. 7A is a perspective view of the case, and FIGS. 7B to 7E are three views of the case. 7A to 7E, the side plates 15 of the case 17 are provided with guides 15a for the coil portions 12a and 12b. As a result, the coil portions 12a and 12b can be easily inserted and the strength of the side plates 15 can be improved. Further, by providing a round 15b at the tip of the guide, it is possible to prevent chipping of parts when the coil portions 12a and 12b are inserted.

  7A to 7E, locking portions 15c are provided on both side plates 15 of the case 17. As shown in FIG. Thereby, the holding | maintenance of the up-down direction to the coil parts 12a and 12b of the case 17 is strengthened, and the stable characteristic can be drawn out. Note that this locking portion may be provided on the intermediate plate 16.

  7A, the intermediate plate 16 of the case 17 is provided with a protrusion 16a for adjusting the fitting position of the coil portions 12a and 12b. This reinforces the horizontal holding of the coil portions 12a and 12b in the case 17, and this can bring out stable characteristics without causing a relative positional shift between the two coil portions 12a and 12b. it can. In FIG. 7A, the protrusion 16a is the lower part of the side surface of the intermediate plate 16. However, this may be any position on the intermediate plate 16 as long as the attachment of the closed magnetic path magnetic core 19 is not inhibited.

  In FIG. 7D, a reinforcing portion 18 a is provided on the bottom plate 18 of the case 17. This improves the strength against torsion and deflection of the bottom plate 18 having the function of holding the coil portions 12a and 12b, and also improves the accuracy of the terminal positions of the coil portions 12a and 12b.

  7B and 7D, a partial cut 18b is provided in the bottom plate 18 of the case 17. As a result, it is possible to secure a wide solder escape area in a planar manner, which is necessary when the terminals of the coil portions 12a and 12b and the windings 14a and 14b are joined by solder. Moreover, the heat radiation effect in the lower surface direction due to Joule heat from the coil portions 12a and 12b is also improved.

  7 (c) and 7 (e), the height of the side plates 15 of the case 17 is at least one half of the height of the coil bobbins 13a and 13b or the upper surface of the core band 20, whichever is higher. did. This is because both side plates 15 hold the coil portions 12a and 12b and have a function of securing the insulation distance in the lateral direction of the coil portions 12a and 12b. This prevents contact with the winding portions of 12a and 12b and improves safety.

  7C and 7E, the height of the intermediate plate 16 of the case 17 is equal to or higher than the height of the coil bobbins 13a and 13b. This has the purpose of avoiding contact between the two coil portions 12a and 12b and ensuring an insulation distance, thereby improving safety.

  As described above, the line filter according to the present invention can be applied to an apparatus such as an electronic device that requires a low height and high terminal position accuracy.

Sectional drawing of the line filter in Embodiment 1 of this invention The perspective view of the line filter in Embodiment 1 of this invention Assembly outline diagram of line filter in embodiment 1 of the present invention Assembly outline diagram of line filter in embodiment 1 of the present invention Assembly outline diagram of line filter in embodiment 1 of the present invention Assembly outline diagram of line filter in embodiment 1 of the present invention (A) Perspective view of case 17 in Embodiment 1 of the present invention, (b) Top view of case 17 in Embodiment 1 of the present invention, (c) Front view of case 17 in Embodiment 1 of the present invention (D) The bottom view of case 17 in Embodiment 1 of the present invention, (e) The side view of case 17 in Embodiment 1 of the present invention. Electric circuit diagram of line filter (A) Sectional view of line filter in conventional example, (b) Perspective view of line filter in conventional example

Explanation of symbols

10,90 Metal terminal 11, 91a, 91b Hollow part 12a, 12b, 92a, 92b Coil part 13a, 13b, 93a, 93b Coil bobbin 14a, 14b, 82, 83, 94a, 94b Winding 15, 95 Side plate 15a Guide 15b Roundness 15c Locking portion 16, 96 Intermediate plate 16a Fitting protrusion 17, 97 Case 18, 98 Bottom plate 18a Reinforcing portion 19, 81, 99 Closed magnetic path magnetic core 20, 100 Core band 20a Adhesion region 101 Fitting groove 102 Fitting protrusion

Claims (11)

A coil bobbin having a hollow part and having a terminal on the bottom side, two coil parts obtained by winding the coil bobbin, a case for housing the two coil parts, and the two coil parts And at least two U-shaped closed magnetic circuit cores for forming closed magnetic paths by inserting into the hollow part from both sides of the two coil parts housed in the case, and the at least two A U-shaped core band for contacting and integrating with a part of the closed magnetic path magnetic core and a part of the case, the case including two side plates protruding upward from a bottom plate and the two pieces A line filter comprising an intermediate plate protruding upward from between coil portions, and configured such that an inner surface side of the case bottom plate and a bottom surface portion on a terminal side of the coil component are in contact with each other. The line filter according to claim 1, wherein a guide for inserting a coil bobbin is provided on both side plates in the case. The line filter according to claim 2, wherein the guide has a rounded tip at the case. The line filter according to claim 1, wherein a locking portion for fixing a coil bobbin is provided on both side plates in the case. The line filter according to claim 1, wherein a locking portion for fixing the coil bobbin is provided on the intermediate plate in the case. The line filter according to claim 1, wherein a bobbin fitting position alignment protrusion is provided on a side surface of the intermediate plate in the case. The line filter according to claim 6, wherein the bobbin fitting alignment protrusion in the case is a lower part of the side surface of the intermediate plate. The line filter according to claim 1, wherein a reinforcing portion is provided on the bottom plate in the case. The line filter according to claim 1, wherein a bottom plate is partially cut off in the case. 2. The line filter according to claim 1, wherein in the case, the height of the side plate is equal to or higher than one half of the height of the coil bobbin or the upper surface of the core band, whichever is higher. The line filter according to claim 1, wherein the height of the intermediate plate in the case is equal to or higher than the height of the coil bobbin.

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