JPS605545Y2 - wire ring with core - Google Patents

Description

[Detailed description of the invention] (1) Technical field of the invention This invention relates to a cored wire ring that can be used up to the UHF band.

Cored coils are widely used in communication equipment as choke coils, etc.

However, the frequency range in which the cored wire operates as an inductance is limited by resonance due to stray capacitance.

(2) Prior art An example of the frequency characteristics of a conventional cored coil is shown in the first example.
As shown in the figure.

In the figure, the horizontal axis is frequency and the vertical axis is impedance.

Figure 1 shows data when the inductance is about 500 ILH, and as is clear from the figure, resonance occurs around 3 MHz, and resonance and anti-resonance are repeated at frequencies higher than that.

(3) Problems with conventional technology Conventional cored coils operate as an inductance up to about 3 MHz, and cannot be used as choke coils at frequencies higher than that.

(4) Purpose of the invention This invention is to provide a cored wire ring that can be used up to the TJHF band by inserting a wire wound around a ring core into a cored wire ring to reduce the apparent stray capacity.

(5) Examples of ideas An exploded view of an embodiment of this invention is shown in FIG.

In the figure, 1 and 2 are cores, 3 is a middle rod, 4 is a bobbin, 5 is a wire wound around the bobbin 4, 6 is a ring core, and 7 is a ring core 6
It is a wire wound around a wire.

The cores 1 and 2, the middle rod 3 and the ring core are magnetic materials,
The middle rod 3 is coaxial with the cores 1 and 2.

Moreover, the wire ring 5 and the wire ring 7 are connected in series.

Next, an assembled sectional view of FIG. 2 is shown in FIG. 3.

In the figure, cores 1 and 2 are assembled to sandwich a bobbin 4.

The center rod 3 is shaped to pass through the bobbin 4, and forms a magnetic path together with the cores 1 and 2.

Therefore, in FIG. 3, a wire ring 5 is wound around the center rod 3, and the outer periphery of the wire ring 5 is wrapped with cores 1 and 2.

Then, a ring core 6 around which a wire ring 7 is wound is placed between the cores 1 and 2 and the middle rod 3.

Next, FIG. 4 shows an example of the frequency characteristics according to FIGS. 2 and 3.

In Figure 4, the inductance is approximately 500, as in Figure 1.
In the case of μH, the resonance around 3 MHz as shown in FIG. 1 has disappeared, and level fluctuations due to resonance and anti-resonance in high frequencies have been significantly reduced compared to FIG.

This allows it to operate as an inductance up to around 500 MHz.

This indicates that the apparent stray capacity is reduced due to the insertion of cores 1 and 2 in the case of the same inductance.

Therefore, the frequency range in which the resonant frequency is moved to a higher range and the core material wire wheel can be used becomes wider.

FIG. 4 shows the measured values when the coil 5 has 25 turns and the coil 7 has 12 turns.

Although FIGS. 2 and 3 show the case where one ring core 6 is used, it is also possible to use a plurality of ring cores 6.

(6) Effects of the invention According to this invention, while conventional cored wire rings could only be used up to several MHz, the usable frequency can be extended to the tJHF band.

[Brief explanation of the drawing]

Figure 1 is an example of the frequency characteristics of a conventional cored wire ring, Figure 2 is an exploded view of an embodiment of this invention, and Figure 3 is an exploded view of the embodiment of this invention.
This figure is an assembled sectional view of FIG. 2, and FIG. 4 is an example of the frequency characteristics according to FIGS. 2 and 3. 1.2...core, 3...middle bar, 4...
... Hobbin, 5 ... Wire wound around bobbin 4, 6 ... Ring core, 7 ... Wire wound around ring core 6.

Claims (1)

[Claims for Utility Model Registration] In a cored wire ring in which a wire is wound around a coaxial inner rod and the wire is wrapped in a core, a wire wound around a non-long core is provided within the core, and the wire is wound around the ring core. A wire ring with a core, characterized in that a wire ring wound around the center rod and a wire wound around the center rod are connected in series.