JPH01212417A - Broad-band common mode choke coil - Google Patents

Abstract

PURPOSE:To contrive miniaturization of a plurality of cores by a method wherein two windings are wound by dividing them into two sets of pairs, the first split type closed magnetic path core is assembled to a set of paired split winding only, and besides, the second split type closed magnetic path is assembled in such a manner that the above-mentioned method is used in common for all split windings. CONSTITUTION:Two windings 12 and 13 are wound by splitting them in such a manner that their magnetic flux will be cancelled with each other, the magnetic legs of a low frequency split type closed magnetic path core 14 is inserted into the center hole of a main winding core 2, they are butt-together, assembled, and besides, a high frequency split type closed magnetic path core 15 is assembled to an auxiliary winding core 3 in the same manner as above. In the main winding core having the assembled low frequency core 14, the windings 12 and 13 are split in the same phase, the distribution capacity of the windings is reduced, low frequency characteristics and high frequency characteristics are secured, the high frequency core 15 is assembled in the auxiliary winding core 3, it is divided, and high frequency characteristics are secured by a set of split winding. As a result, it is unnecessary to superpose the high frequency core 15 on the low frequency core 14, and the miniaturization of the composite core can be achieved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a common mode choke coil for noise prevention used in power supply circuits of home appliances.

[Prior art]

As the power supply circuits of home appliances such as video equipment and television receivers are becoming increasingly sophisticated, common mode choke coils for noise prevention used in these power supply circuits must maintain characteristics up to high frequency bands.

A conventional wideband common mode choke coil is a two-stage connection of a low-frequency core-based coil (usually with high inductance) and a high-frequency core-based coil (usually with low inductance). and a composite core that integrates a low-frequency core and a high-frequency core by weighing,
It had a common winding for both low and high frequencies.

In addition, there are two types of coil structure: one uses a toroidal core, and the other uses a split closed magnetic circuit core and a winding frame with multiple sets of winding compartments. Since then, structures using winding frames have mainly been put into practical use.

[Problem that the invention seeks to solve]

A broadband coil in which coils are connected in two stages is expensive because it has two coils, and it takes time and effort to attach to a board, and there are problems such as a large mounting area. Broadband coils that use composite cores require a size that allows the high-frequency core to be stacked on the low-frequency core, which results in large composite cores, which poses problems such as difficulty in designing, procuring, and changing the composite core. .

[Means for solving problems]

SUMMARY OF THE INVENTION An object of the present invention is to provide a broadband common mode choke coil with a novel structure that eliminates the conventional drawbacks.

In the present invention, a partition is provided on the outer periphery of the core, and at least four partitions are provided on the outer periphery of the core.
The two windings are each divided into winding sections so that the magnetic flux cancels each other out, forming at least two pairs of divided windings. The first divided closed magnetic circuit core is assembled in common to all the divided windings, and the second divided closed magnetic circuit core is assembled only to one set of the paired divided windings. do.

〔Example〕

The details of one embodiment of the present invention will be explained with reference to the drawings.

FIG. 1 is an external perspective view, and FIG. 2 is a cross-sectional plan view taken along line AA in FIG. 1. FIG. 3 is a front view of the winding frame.

As shown in Figures 2 and 3, the winding frame 1 has a main winding core 2 in the shape of a rectangular tube, and is shorter than the main winding core 2 and has the same external dimensions as the main winding core 2 (here, the central hole also has the same shape and dimensions). The side wall of the sub winding core 3 is connected to the center of the side wall of the main winding core 2 via a bridging wall portion 4.

A common center partition flange 5 is provided on the outer periphery of the central portion of the main core 2 and the sub-core 3, and bridging walls 4 are provided at both ends of the sub-core 3 and the main core. (1) Outer periphery i, an extended end partition.

Common flanges (hereinafter simply referred to as common flanges) 6a and 6b are provided, respectively.

The lower end corner of the central partition flange 5 on the side of the subwinding core 3 is extended downward to form a standoff 51.

End flanges 7a and 7b having a terminal block 8 and a core guide wall 9 are provided at both ends of the main winding core 2, respectively.

Two pin terminals 10 are vertically installed on each terminal block 8, and a small cylindrical stand 81 (four in total, two in FIG. ).

Further, on the outer periphery of the main winding core 2, between the end face flanges 7a, 7b and the end face partition common flanges 6a, 6b, partition flanges 11a, l are provided.
lb.

The winding frame 1 has a main winding core 2, end flanges 7a and 7b, and a partition collar 1.
A first pair of winding sections formed by the partition flanges 11a and ilb and a second pair of winding sections formed by the end face partition common flanges 6a and 6b are formed, and the main winding core 2 and the sub winding core Common to 3, the center partition tsuba 5 and the end partition common tsuba 6a.
.

6b, a third pair of winding sections are formed.

First, the broadband common mode choke coil is
The windings 12 and 13 are divided and wound in order in the pair of winding sections described above so that their magnetic fluxes cancel each other out, and the ends are wrapped around the standoffs 81 and connected to the pin terminals 10, respectively. A coil is made, and then a low frequency split type closed magnetic circuit core (UU type Mn-Zn ferrite core) 14 is made.
As shown in Figure 1, the main winding core 2 is tightened using metal fittings.
Then, like the high-frequency division, it is assembled to the subwinding core 3 and completed.

In the main winding core 2 to which the low frequency core 14 is assembled, the winding 12
．． 13 in the same phase (divided into three) to reduce the distributed capacitance of the winding, low frequency characteristics and high frequency characteristics are ensured, and the high frequency core 15 is assembled to the sub winding core 3, and the winding is divided into three. This is a broadband common mode choke coil that ensures high frequency characteristics with one set of split windings. , In addition, in the example, the case where the sub-winding roll has the same outer dimensions and center hole dimensions as the main winding core 2 is shown, and as shown in FIG. The width dimension and center hole may be different from the main winding core 2, and the high frequency core 1 may be different from the main winding core 2.
The magnetic leg 5 has a size that fits into the center hole of the sub-winding core 3, and may be omitted.

As described above, the common mode choke coil according to the present invention has the following features.

b) It must be one reel.

口）Being able to wind the wire continuously.

c) Therefore, it can be made at low cost.

2) The mounting area of the winding frame is smaller than that of the conventional two-stage connection.

e) The high frequency core does not need to be stacked on the low frequency core, so it can be made smaller.

f) Replacing the high frequency core is easier than when using a composite core.

[Brief explanation of the drawing]

FIG. 1 is an external view showing an embodiment according to the present invention. FIG. 2 is a cross-sectional plan view taken along line A-A in FIG. 1. FIG. 3 is a front view of the winding frame in FIG. 1. Margin 1 below...Reel frame. 2... Main winding core. 3... Sub-winding core. 4...Bridging wall section. 5...Central partition tsuba. 8...Terminal block. 6a, 6b...Tsuba to the end partition. 10...Pin terminal. 7a, 7b... end face tsuba. 9... Core guide wall. 11a, llb... partition tsuba. 12.13・
...Winding wire. 14...Divided closed magnetic circuit core for low frequency. 15...Divided closed magnetic circuit core for high frequency. 51, 81...Standoff. Patent applicant: Tohoku Metal Industry Co., Ltd. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] Two windings are divided and wound into each of the winding sections so that their magnetic fluxes cancel each other out on a winding frame formed by providing a partition flange on the winding core to form at least four winding sections. to form a plurality of pairs of divided windings, a first divided closed magnetic circuit core is commonly attached to all the divided windings, and a first divided closed magnetic circuit core is assembled to one set of the other pair of divided windings in the winding section. , a broadband common mode choke coil assembled with a second split type closed magnetic circuit core.