JPH0782953B2 - Broadband common mode choke coil - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a noise-preventing common mode choke coil used in a power supply circuit of a home electric appliance.

[Conventional technology]

Since the frequency of power supply circuits for home appliances such as video devices and television receivers is increasing, the noise-preventing common-mode choke coil used in these power supply circuits must have characteristics up to a high frequency band.

A conventional wideband common mode choke coil has a coil using a low frequency core (usually having high inductance) and a coil using a high frequency core (usually having low inductance) connected in two stages. The composite core in which the low frequency core and the high frequency core are superposed and integrated is provided with a winding common to the low frequency and the high frequency.

Further, as the structure of the coil, there are a case where a toroidal core is used and a case where a split closed magnetic circuit core and a winding frame provided with a plurality of sets of winding sections are used. The structure using a reel is mainly used.

[Problems to be solved by the invention]

The broadband coil connecting the coils in two stages is expensive because it has two coils, and it takes time to mount it on the substrate and has a large adhesion area. A wideband coil that uses a composite core requires a size that allows the high-frequency core to overlap the low-frequency core, and the composite core becomes large, making it difficult to design, procure, and change the composite core. .

[Means for solving problems]

It is an object of the present invention to provide a wideband common mode choke coil having a novel structure that eliminates the conventional drawbacks.

According to the present invention, a partition is provided on the outer periphery of the winding core so that at least 4
Each winding section is divided into winding sections so that at least two pairs of divided windings are formed so that the magnetic fluxes of the two windings cancel each other out on the winding frame that forms the winding section of one winding. Characterized in that the first split type closed magnetic circuit core is assembled in common to all the split windings, and the second split type closed magnetic circuit core is further assembled only in one pair of split windings. To do.

〔Example〕

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

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

As shown in FIG. 2 and FIG. 3, the reel 1 has a rectangular tube-shaped main winding core 2 and an outer dimension shorter than the main winding core 2 and the same as the main winding core 2 (here, the central hole also has the same shape dimension). And the side wall of the sub winding core 3 is connected to the central portion of the side wall of the main winding core 2 via the bridging wall portion 4.

A common central partition flange 5 is provided on the outer periphery of the central portion of the main winding core 2 and the auxiliary winding core 3, and the bridging wall portion 4 and the outer periphery of the main winding core 2 are extended at both ends of the auxiliary winding core 3. Common end flanges (hereinafter simply referred to as common flanges) 6a and 6b are provided.

A lower end corner portion of the central partition flange 5 on the side of the sub winding core 3 is extended downward to form a standoff 51.

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

Two pin terminals 10 are vertically provided on the terminal block 8, respectively, and a small column standoff 81 (a total of four pieces, two pieces in FIG. 3 are provided near the pin terminals 10 along the inner surface of the end flange 7). Is shown).

Further, partition flanges 11a and 11b are provided on the outer circumference of the main winding core 2 between the end surface flanges 7a and 7b and the end surface partition common flanges 6a and 6b, respectively.

The reel 1 comprises a main winding core 2 having a first pair of winding sections formed by end flanges 7a, 7b and partition flanges 11a, 11b, and a second pair of partition flanges 11a, 11b and end partition common flanges 6a, 6b. A pair of winding sections are formed, and a third pair of winding sections is formed commonly by the main winding core 2 and the sub winding core 3 by the central partition flange 5 and the end surface partition common flanges 6a, 6b. is there.

The wideband common mode choke coil is first installed in the reel 1 with 2
The individual windings 12 and 13 are sequentially divided and wound in the above-described pair of winding sections so that their magnetic fluxes cancel each other out, and the ends are entwined with the standoff 81 and connected to the pin terminals 10. The coil is made, and then the split type closed magnetic circuit core for low frequency (UU type Mn-Zn ferrite core) 14 is inserted by inserting the magnetic leg into the central hole of the main winding core 2 as shown in FIG. Assemble with a non-clamping metal fitting, and then attach a high frequency split type closed magnetic circuit core (UU type Ni-Zn ferrite core) 15 to the sub winding core 3 in the same manner.

In the main winding core 2 assembled with the low frequency core 14, the windings 12, 13
By dividing the inside of the same phase (3 divisions) to reduce the distributed capacitance of the winding, low frequency characteristics and high frequency characteristics are secured, and the high frequency core 15 is assembled to the sub winding core 3 to divide the winding into 3 divisions. It is a wideband common mode choke coil that secures high frequency characteristics by one set of windings.

Although the sub-core 3 has the same outer dimensions and the same central hole size as the main core 2 in the embodiment, as shown in FIG. The width dimension and the central hole may be different from those of the main winding core 2, and the high frequency core 15
The magnetic leg of 3 need not be dimensioned to fit in the central hole of the sub winding core 3.

〔The invention's effect〕

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

A) One reel.

B) The winding can be continuously wound.

C) Therefore, it should be cheap to make.

D) The mounting area of the bobbin 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 should be compact.

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

[Brief description of drawings]

 FIG. 1 is an external view showing an embodiment according to the present invention. 2 is a cross-sectional plan view taken along the line AA in FIG. FIG. 3 is a front view of the reel shown in FIG. 1 ... reel. 2 ... Main winding core. 3 ... Sub winding core. 4 ... Bridge wall section. 5 ... Central partition tsuba. 8 ... Terminal block. 6a, 6b ... Common flange for end face partition. 10-pin terminal. 7a, 7b ... End flange. 9 ... Core guide wall. 11a, 11b ... Partition tsuba. 12, 13… Winding. 14 ... Split type closed magnetic circuit core for low frequencies. 15 ... High frequency split type closed magnetic circuit core. 51,81… Standoff.

Claims (1)

[Claims] 1. A winding frame in which a winding core is provided with a partition flange to form at least four winding sections, and two windings are respectively provided in the winding sections so that their magnetic fluxes cancel each other out. A plurality of pairs of split windings are formed by splitting and winding, and the first split type closed magnetic circuit core is assembled in common to all split windings, and In one set,
A wideband common mode choke coil assembled with a second split type closed magnetic circuit core.