JPH0563015U - Line filter - Google Patents

Abstract

(57) [Abstract] [Purpose] An object of the present invention is to provide a line filter which is inserted into a power supply line of an electronic device to prevent noise from entering and leaking and which is highly reliable against external vibration. [Structure] A coil bobbin 1 having two kinds of windings is attached to opposite magnetic legs of a closed magnetic circuit magnetic core 9, and a tongue portion deformed by external stress on both side plates 5 so as to cover the outside of the coil portion. The U-shaped case 8 provided with 6 is incorporated, and further the U-shaped core band 10 is incorporated from the outside, and the root portions 12 of both side plates 11 of the core band 10 are attached to the tongue portion 6 of the case 8. The closed magnetic circuit core 9 is configured so as to be in pressure contact with each other, and the closed magnetic circuit magnetic core 9 hardly moves with respect to external vibration, and it is possible to provide a stable and highly reliable line filter without causing damage or deterioration of magnetic permeability. Becomes

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a line filter which is inserted into a power line of various electronic devices to prevent noise from entering and leaking.

[0002]

[Prior Art]

Generally, a line filter is mainly used to prevent a common mode noise component generated between a pair of lines in a power supply line and ground, and a line including two coils L ₁ and L ₂ as shown in FIG. It is an electric circuit diagram of the filter.

In a conventional general line filter, as shown in FIGS. 5 and 6, a coil bobbin 13 made of a resin molded body is provided with one winding 14, and another coil bobbin 13 is provided with another winding 15. The coil bobbin 13 is mounted on the case 16, UU type closed magnetic circuit magnetic cores 17 made of ferrite or the like are inserted into the coil bobbin 13 from both sides, and the UU closed magnetic circuit magnetic cores 17 and the outer peripheral portion of the case 16 are made of stainless steel or the like. A line filter was constructed by fixing with a U-shaped core band 18 made of a metal material for springs.

[0004]

[Problems to be solved by the device]

 In the above-described conventional configuration, the UU closed magnetic circuit magnetic core 17 fixed by the core band 18 and the two coil bobbins 13 mounted on the UU closed magnetic circuit magnetic core 17 are inserted in the UU closed magnetic circuit magnetic core 17 in the insertion direction. Also, rattling occurs in the right angle direction, and vibrations applied from the outside such as during transportation cause breakage of the UU closed magnetic circuit magnetic core 17 and fatal damage such as deterioration of magnetic permeability.

As a measure against the above problems, the present invention provides a line filter which is stable and reliable against external vibration by minimizing the rattling between a UU type closed magnetic circuit core fixed by a core band and a coil bobbin. To do.

[0006]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention comprises at least two coil portions each having a coil bobbin having a terminal on a collar portion and having a coil wound thereon, and a top plate having at least two side plates projecting downwardly. Assemble the coil part, attach a U-shaped core band around the magnetic core that constitutes the closed magnetic circuit to be assembled in this coil part, and assemble the core band at the root parts of both side plates of the above core band to form the case. The core band is configured to be provided with tongue pieces that press against both side plates of the core band while being biased toward the common part side.

[0007]

[Action]

 As described above, the tongue provided on the case presses the both side plates of the core band attached from the outside of the case to urge the case toward the common part side of the core band and to prevent external vibration. However, since the core band absorbs the vibration between the core band and the tongue of the case, the closed magnetic circuit core does not directly collide with the coil bobbin, and the damage of the closed magnetic circuit core and the deterioration of the magnetic permeability can be prevented.

For the above reasons, it is possible to provide a line filter that is stable and highly reliable against external vibration.

[0009]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. 1 and 2 are a plan sectional view and a side view of a line filter according to an embodiment of the present invention. FIG. 3 is a perspective view showing an embodiment of a case according to the present invention.

As shown in FIG. 1, a coil bobbin 1 having a hollow portion and made of a resin molded body is wound with one winding 2, another coil bobbin 1 is wound with the other winding 3, and a winding start lead and winding are further performed. The end lead is wound around the metal terminal 4 attached to the coil bobbin 1 and connected by solder dipping.

These coil bobbins 1 are U-shaped, which is made of a resin molded body and is provided by forming cutouts 7 on both side plates 5 tongue portions 6 that are deformed by external stress, as shown in FIG. Alternatively, the U-shaped case 8 is attached so that there is no rattling, and the UU-shaped closed magnetic circuit magnetic core 9 made of ferrite or the like is attached to the hollow portion of the coil bobbin 1 from both sides.

Further, a U-shaped core band 10 made of a metal plate for spring such as stainless steel is inserted from the outside of the case 8 and the UU-shaped closed magnetic circuit magnetic core 9 along the notch 7 of the case 8 and mounted. The closed magnetic circuit magnetic core 9 is fixed. At this time, the size of the tongue piece 6 is set so that the root parts 12 of the both side plates 11 of the core band 10 are brought into pressure contact with the tongue pieces 6 provided on the both side plates 5 of the case 8. The thickness of the tongue 6 is set to about 0.3 to 1.5 mm so that the tongue 6 is slightly deformed by the pressure of the core band 10.

In the line filter configured as described above, when external vibration is applied, the tongue pieces 6 of the side plates 5 of the case 8 which are in pressure contact with the root portions 12 of the side plates 11 of the core band 10 generate vibration. The magnetic flux is absorbed and the closed magnetic circuit magnetic core 9 does not collide with the coil bobbin 1 and becomes stable and highly reliable against external vibration.

[0014]

[Effect of the device]

 As described above, according to the present invention, since the tongue pieces that are pressed against the core band are provided on both side plates of the case, the closed magnetic circuit magnetic core hardly moves with respect to external vibration, and the closed magnetic circuit core collides with the coil bobbin and is damaged and the magnetic permeability is reduced. It is of great industrial value to provide a stable and highly reliable line filter without causing deterioration.

[Brief description of drawings]

FIG. 1 is a plan sectional view of a line filter according to an embodiment of the present invention.

FIG. 2 is a side view of the same.

FIG. 3 is a perspective view showing an embodiment of a case according to the present invention.

FIG. 4 is an electric circuit diagram of a line filter.

FIG. 5 is a plan sectional view of a line filter in a conventional example.

FIG. 6 is a side view of the same.

[Explanation of symbols]

 1 Coil bobbin 2 One winding 3 The other winding 4 Metal terminal 5 Both side plates 6 Tongue piece part 7 Notch part 8 Case 9 UU type closed magnetic circuit magnetic core 10 Core band 11 Both side plates 12 Root part

Claims (1)

[Scope of utility model registration request] 1. A coil bobbin having a terminal on a collar portion is provided with at least two coil portions wound, and two coil portions are incorporated in a case in which at least both side plates protruding downward are provided on a top plate. Attach the case to the common side of the core band by attaching a U-shaped core band around the magnetic core that constitutes the closed magnetic circuit to be incorporated in the coil part, and by assembling the core band at the root parts of both side plates of the core band of the above case. A line filter provided with tongues that urge and press against both side plates of the core band.