JPS6125223Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a common mode choke coil used in line filters and the like, and particularly relates to an improvement in the structure of its core cover.

Common mode choke coils inserted into power supply lines as line filters for relatively large currents generally have a structure in which they are fixed to a case by resin casting. However, such a structure increases the material cost of the casting resin and increases the number of man-hours, leading to an increase in cost.In recent years, structures in which the common mode chiyoke coil is fixed to the case or circuit board without using resin casting have been developed. Proposed.

FIG. 1 shows an example of a conventional common mode choke coil of this type. In this figure, a common mode York coil 1 has an annular core 2 covered with a core cover 3 and windings 4A and 4B.
A pair of fixing protrusions 5 are formed on the inner peripheral surface of the core cover 3 so as to face each other. A grooved line 6 is formed on the opposing surface of the fixing protrusion 5. on the other hand,
A storage case 7 that stores the common mode York coil 1 has a guide rod 8 erected at the center of the bottom.
A protruding strip 9 is formed on this guide rod 8. The common mode tie yoke coil 1 is fixed to the storage case 7 using the groove 6 of the core cover 3 and the guide rod 8.
This is done by fitting with the protrusion 9.

By the way, in the structure shown in FIG. 1, since the groove 6 is formed on the fixing protrusion 5, there is a limit to how narrow the width of the protrusion 5 can be, and the upper and lower surfaces of the core cover 3 are flat. Therefore, if the width of the protrusion 5 is narrowed, the creepage distance between the windings 4A and 4B will be shorter than the dimensions required by Japan's Electrical Appliance and Material Control Act, the U.S. UL standard, etc. For this reason, the number of turns is inevitably reduced by the provision of the large-width protrusion 5, which tends to reduce the inductance.

Furthermore, a structure in which a separator plate for isolating the windings 4A and 4B is formed integrally across the core cover 3 from the beginning has been considered, but in this case, during the winding work, This has the disadvantage that the space through which the winding wire passes is narrowed, making it difficult to work with the winding wire.

In view of the above points, the present invention forms a convex strip that fits with the concave strip on the fixing side on the inner circumferential side of the fixing protrusion of the core cover, and also forms the fixing protrusion on the upper and lower surfaces of the core cover. The present invention aims to provide a common mode York coil in which the fixing protrusion is made thinner by protruding from the fixing protrusion, and the number of turns and inductance are thereby increased.

Embodiments of the common mode choke coil according to the present invention will be described below with reference to the drawings.

In FIGS. 2 to 5, the common mode York coil 10 has an annular core 11 and a core cover 12.
The core cover 12 has a lower half cover portion 14 that covers half of the inner and outer peripheral surfaces and the lower surface of the annular core 11, and an upper half that covers the remaining portion of the annular core 11. It consists of a cover part 15. Here, the fixing protrusion 16 of the core cover 12 includes a pair of protrusions 1 that protrude toward the inner circumference.
7 and a protrusion 18 protruding from the upper and lower surfaces, and the protrusion 17 and protrusion 18 of the lower and upper half cover parts 14 and 15 are fitted and integrated during assembly. .

The common mode choke coil 10 as described above is attached to the storage case 20 as shown in FIG. That is, a guide rod 21 is erected at the center of the bottom surface of the storage case 20, and a groove 2 is formed on the guide rod 21.
2 is formed, and the core cover 12 is formed on the grooved line 22.
By fitting the protrusions 17, the common mode York coil 10 is fixed to the storage case 20.

According to the above embodiment, since the extremely thin protruding strip 17 is provided on the inner circumference of the core cover 12, the winding space for the windings 13A and 13B can be made sufficiently large. Therefore, the number of turns can be increased sufficiently,
The inductance can be increased in proportion to the square of the number of turns. In addition, the creepage distance between the windings 13A and 13B is determined by the projections 18 on the upper and lower surfaces of the core cover 12.
It is set to be sufficiently long by forming .

Although FIG. 6 shows the case where the common mode choke coil 10 is fixed to the storage case, it is possible to fix the common mode choke coil 10 by forming a guide rod 21 on the circuit board of an electronic device.
can be directly fixed to a circuit board, etc.

As described above, according to the present invention, a convex strip into which the fixing side concave strip fits is formed on the inner peripheral side of the fixing protrusion of the core cover, and the fixing protrusion is also provided on the upper and lower surfaces of the core cover. By making the fixing protrusion protrude, a common mode York coil can be obtained in which the fixing protrusion can be made thinner and the number of windings and inductance can be increased.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing a conventional common mode chiyok coil, Fig. 2 is a plan view showing an embodiment of the common mode chiyok coil according to the present invention, Fig. 3 is a front view of the same, and Fig. 4 is a plan view of the same. A side view, FIG. 5 is an exploded perspective view showing the windings omitted, and FIG. 6 is a plan view showing the structure in which the common mode York coil is fixed to the storage case. 1, 10...Common mode chiyoke coil,
2, 11... Annular core, 3, 12... Core cover, 4A, 4B, 13A, 13B... Winding wire, 5,
16...Fixing protrusion, 14...Lower half cover part, 15...Upper half cover part, 17...Convex strip, 1
8... Projection, 20... Storage case, 21... Guide rod, 22... Concave strip.

Claims (1)

[Scope of utility model registration request] In a common mode York coil in which an annular core is covered with a core cover and two windings are provided, a fixing member that continuously protrudes from the core cover at least toward the inner circumferential side and the upper and lower surfaces to separate the two windings. The fixing protrusion is integrally formed, and the inner circumferential side of the fixing protrusion has a single protruding stripe, and the upper and lower ends protrude from the upper and lower surfaces of the core cover and are continuous with the protruding stripe. Features a common mode chiyoke coil.