JPH05166566A - Cable for electronic and electric equipment - Google Patents

Abstract

PURPOSE:To eliminate high frequency components in noise by storing wires constituting a cable in a plug while passing them through the through hole of a magnetic core with absorbs noise of higher than a specified frequency. CONSTITUTION:A magnetic core 11 stored in a plug 2 is made by a ring-shaped magnetic substance such as a Mn-Zn ferrite having attenuation characteristic for high frequencies higher than 100MHz. A through hole 12 for inserting wires 6 is provided at the center portion of the core 11. The core 11 is flat with its height smaller than its outside diameter and is stored in the flat plug 2 in such a manner that its end face 13 is parallel to the extension line of a cable 1. Wires 6 coming out of the end of the cable 1 passes through the through hole 12 from one side of the core 11 and are connected to a contact 3 from the opposite side. While the cable is in use, high-frequency noise higher than 100MHz and high frequency components in impulse noise passing through the wires 6 are absorbed and eliminated by the high-frequency loss of the core 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable for electronic or electric equipment provided with noise countermeasures.

[0002]

2. Description of the Related Art FIG. 7 shows a conventional electronic device with noise countermeasures.
It is a perspective view which shows the cable for electric devices. In the figure,
1 is a cable, 2 is a plug for connecting to the end of the cable 1, 3 is its contact, 4 is the cable 1 in the insertion hole 5
Is a magnetic core that is mounted so as to pass through.

In the conventional cable for electronic / electrical equipment constructed as described above, the magnetic core 4 has an attenuation characteristic for high frequency noise of 100 MHz or more as shown in FIG. Passing through 10
The high frequency noise of 0 MHz or higher and the high frequency portion of the impulse noise are absorbed and removed by the high frequency loss of the magnetic core 4. The impulse noise has a sharp rising waveform as shown in FIG. 6A when the magnetic core 4 is not attached, but is shown in FIG. 6B when the magnetic core 4 is attached. Thus, the high-frequency part is removed, resulting in a gentle rising waveform.

FIG. 8 is a partially transparent perspective view showing a cable for electronic / electrical equipment which is provided with measures against low frequency conduction noise as disclosed in, for example, Japanese Utility Model Laid-Open No. 60-53179. In the figure,
Reference numeral 6 is an electric wire forming the cable 1, and 7 is a common mode choke. In the common mode choke 7, a plurality of windings 9 are formed on a core 8 and are connected to the electric wire 6 and the contact 3, respectively.

In the cable for electronic and electric equipment of FIG. 8, the common mode choke 7 absorbs low frequency noise of 30 MHz or less passing through the electric wire 6 but does not absorb high frequency noise of 100 MHz or more due to its high inductance characteristic. ..

[0006]

In the electronic / electrical device cable of FIG. 7, the magnetic core 4 is the cable 1.
Since it is attached to the cable, the distance from the noise generation source is increased, so the noise absorption effect is small, and before the noise reaches the magnetic core 4, radiation noise is generated from the cable 1 and the handleability is improved. There was a problem that was bad.

In the cable for electronic / electrical equipment shown in FIG. 8, since the common mode choke 7 is used, low frequency noise of 30 MHz or less can be removed, but high frequency noise and impulse noise of 100 MHz or more are eliminated. There was a problem that it could not be removed.

The present invention has been made in order to solve the above-mentioned problems, and it is possible to remove high-frequency portions of high-frequency noise and impulse noise within a short distance from a noise generation source, suppress generation of radiation noise, and handle it. The purpose is to obtain a cable for electronic and electrical equipment with excellent properties.

[0009]

The present invention is the following cable for electronic / electrical equipment. (1) A cable composed of a plurality of electric wires, a plug connected to the cable, a magnetic core that is housed in the plug with the electric wire inserted through an insertion hole, and that absorbs high-frequency noise of 100 MHz or more Cable for electronic and electrical equipment equipped with. (2) The electronic / electrical device cable as described in 1 above, wherein the magnetic core has an electric wire housing.

[0010]

In the cable for electronic / electrical equipment according to the first aspect of the present invention, the electric wire forming the cable passes through 10
The high frequency noise of 0 MHz or higher and the high frequency portion of the impulse noise are absorbed and removed by the high frequency loss of the magnetic core. In this case, since the magnetic core is housed in the plug, the distance from the noise generation source is reduced, the noise removal effect is enhanced, and the radiation noise is reduced.

According to the second aspect of the present invention, the electric wire forming the cable is accommodated in the electric wire accommodating portion of the magnetic core and is accommodated in the plug together with the magnetic core.
The wiring inside the plug is easily performed and the electric wire is prevented from being damaged.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. Embodiment 1 FIG. 1 is a perspective view of a cable for electronic / electrical equipment of Embodiment 1,
FIG. 2 is a partially transparent perspective view thereof, in which the same reference numerals as those in FIGS. 7 and 8 denote the same or corresponding portions.

Reference numeral 11 denotes a magnetic material core housed in the plug 2, which is formed in the shape of a ring from a magnetic material such as Mn-Zn ferrite having an attenuation characteristic for high frequencies of 100 MHz or more as shown in FIG. The portion has an insertion hole 12 for inserting the electric wire 6. The magnetic core 11 is formed in a thin shape having a height smaller than the outer diameter, and is housed in the thin plug 2 so that the end surface 13 is parallel to the extension line of the cable 1. The electric wire 6 extending from the end of the cable 1 passes through the insertion hole 12 from one side of the magnetic core 11 and is connected to the contact 3 from the opposite side.

The above electronic / electrical device cable is used by connecting the other end of the cable 1 to an electronic / electrical device or a power source and connecting the contact 3 of the plug 2 to the power source or another electronic / electrical device. In use, the high frequency noise of 100 MHz or more and the impulse noise passing through the electric wire 6 is absorbed and removed by the high frequency loss of the magnetic core 12.

When the magnetic core 11 is not attached, the impulse noise has a waveform as shown in FIG. 6 (a), and the sharp rising portion is the high frequency portion, which generates radiation noise and causes the electronic noise. Figure 2
As shown in FIG. 6B, the magnetic core 11 is housed in the plug 2 and the electric wire 6 is passed through the insertion hole 12, whereby the high frequency portion is absorbed, and a gentle rising waveform is formed as shown in FIG. 6B. Become.

Since the magnetic core 11 is housed in the plug 2, noise coming from the contact 3 side is eliminated in the plug 2. Therefore, high-frequency noise can be removed at a short distance from the noise source,
It is possible to suppress the harm of high frequency noise to electric equipment.

Further, by forming the magnetic core 11 in a thin shape as in the embodiment, it is possible to house the magnetic core 11 in a small plug 2, and the device can be downsized to efficiently remove noise. ..

Example 2 FIG. 3 is a perspective view showing a magnetic core and a cable of Example 2. In this embodiment, the electric wire 6 forming the cable 1 is wound around the magnetic core 11 a plurality of times, and is housed in the plug 2 in this state. As a result, an absorption effect proportional to the square of the number of turns can be obtained. The noise removal of the present invention does not depend on the inductance like a common mode choke, but the resistance increases as the number of turns increases, so the number of turns is preferably 3 or less.

Third Embodiment FIG. 4 is a perspective view showing a magnetic core of a third embodiment. In this embodiment, the magnetic core 11 includes a portion of one end face 13 on the cable 1 side and a contact 3 of the opposite end face 13.
The electric wire accommodating portion 14 has a concave electric wire accommodating portion 14 on the side.
It is housed in the plug 2 with the electric wire 6 housed therein. Therefore, the electric wire 6 can be easily laid, and the electric wire 6 can be prevented from being damaged. When the wire housing portion 14 is formed in a concave shape as in the third embodiment, the moldability is improved and the plug can be made compact.

In the above embodiment, the example of the AC cable is shown as the cable 1, but it can be applied to a signal system and other cables.

[0021]

According to the electronic / electrical device cable of claim 1 of the present invention, since the electric wire constituting the cable is inserted into the insertion hole of the magnetic core and accommodated in the plug, a short distance from the noise source is generated. The high frequency noise and the high frequency part of the impulse noise can be removed by this, generation of radiation noise can be suppressed, and a cable for electronic / electrical equipment excellent in handleability can be obtained.

In the cable for electronic / electrical equipment according to claim 2 of the present invention, since the electric wire accommodating portion is formed in the magnetic core, the wiring is easy and the electric wire is prevented from being damaged, and the high frequency portion of high frequency noise and impulse noise is prevented. Electronic that can be removed efficiently
A cable for electric equipment is obtained.

[Brief description of drawings]

FIG. 1 is a perspective view of a cable for an electronic / electrical device according to a first embodiment.

FIG. 2 is a partially transparent perspective view of the electronic / electrical device cable according to the first embodiment.

FIG. 3 is a perspective view showing a magnetic core and a cable of Example 2.

FIG. 4 is a perspective view of a magnetic core of Example 3.

FIG. 5 is a damping characteristic diagram of a magnetic body.

6A and 6B are waveform diagrams of impulse noise.

FIG. 7 is a perspective view of a conventional electronic / electrical device cable.

FIG. 8 is a partially transparent perspective view of a conventional electronic / electrical device cable.

[Explanation of symbols]

 1 Cable 2 Plug 3 Contact 4,11 Magnetic Core 5,12 Insertion Hole 6 Electric Wire 14 Electric Wire Housing

Claims (2)

[Claims] 1. A cable composed of a plurality of electric wires, a plug connected to the cable, and the electric wire housed in the plug with the electric wire inserted through an insertion hole and having a frequency of 100 MHz.
A cable for electronic / electrical equipment, comprising: a magnetic core that absorbs the above high-frequency noise. 2. The cable for electronic / electrical equipment according to claim 1, wherein the magnetic core has an electric wire housing.