JP3095059B2 - EMC connector for combined noise and surge protection - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connector for use in communication equipment and the like, and more particularly, to a connector for protecting a communication equipment and the like from high voltage and large current surges such as lightning and reducing high frequency electromagnetic noise. The present invention relates to a composite protective EMC (electromagnetic compatibility) connector.

[0002]

2. Description of the Related Art In general, a connector simply has a function of connecting a communication line to a communication device, and a high voltage surge and electromagnetic noise induced in the communication line cause this. Since the data is directly transmitted to the communication device via the connector, the communication device connected thereto may be damaged or the communication quality may be deteriorated.

[0003] Japanese Patent Application Laid-Open No. 7-106138, filed by the present applicant and already published, discloses an EMC filter for a multi-wire balanced communication line for reducing electromagnetic noise, particularly common mode noise, flowing from a communication line over a wide band. Is disclosed. In this publication, there is an EM for multi-wire balanced communication lines.
As an embodiment of the C filter, an embodiment in which a common mode choke coil is provided in a housing of a modular jack is described. This common mode choke coil includes a flat closed magnetic path core constituting a closed magnetic path, and a plurality of coils formed of at least one pair of communication lines, and the paired communication lines are located close to each other. The coils are wound around the core of the closed magnetic path so that the magnetic flux flows in the same direction in the closed magnetic path when the current flows in the same direction in the communication line forming the pair of the coils. Furthermore, these communication lines travel in one direction from the signal input end of the coil to the signal output end.

When a common mode noise current flows in such a coil winding, the magnetic flux formed by each coil is added in a closed magnetic circuit core, so that a very large inductance is obtained, and noise intrusion occurs. Is blocked. When a signal current (normal mode or differential mode current) flows through the coil windings, the magnetic fluxes formed by the coils cancel each other out in the closed magnetic circuit core, so that the leakage inductance becomes very small and signal transmission is not hindered. .

According to such a known modular jack, high-frequency electromagnetic noise flowing from a communication line can be effectively removed. However, a high voltage and a large current such as a lightning surge cannot be removed, and a passing high voltage and a large current may damage a communication device connected downstream of the modular jack.

On the other hand, electromagnetic noise (common mode noise)
There is a method of installing a combination of a varistor and a common mode choke coil in a modular jack as a method for reducing both the surge current and the surge current.

However, in order to absorb a lightning surge of several tens of kV and several hundred A (for example, 30 kV, 1500 A), a considerably large varistor is required, and this varistor is incorporated in a number corresponding to the number of slits of the modular jack. It was difficult. Furthermore, since the varistor having this class of surge withstand capability has a large capacitance and deteriorates the transmission characteristics (insertion loss) in the normal mode, the usable frequency band is extremely limited and cannot be applied to a high-speed communication line. there were. In order to avoid this, if the capacitance of the varistor is reduced by reducing the area of the varistor, the surge immunity is reduced and the lightning surge absorption ability is reduced, so that it can be mounted on a modular jack with good transmission characteristics and high surge immunity It is difficult to achieve the dimensions at the same time.

For example, assuming a varistor having a limit voltage of 120 V and a surge withstand capacity of about 500 A having dimensions that can be mounted on a modular jack, the thickness of the varistor must be reduced, so that the capacitance is about 1000 pF. When this is connected in parallel to a line having a characteristic impedance of 110Ω, the frequency at which the insertion loss becomes 3 dB is about 1.2 MHz.
z. This is an ideal case where the loss of the choke coil connected in series is zero, and the actual frequency characteristics are inferior. Therefore, although it can be used for the transmission of 64 kb / s, which is the basic interface of ISDN, it can be used for higher-speed transmission equipment (1.5 Mb / s or more).
Primary group interface, high-speed L of 10Mb / s or more
AN).

Further, as shown in the current-terminal voltage characteristic of FIG. 1, the limiting voltage of the varistor has a large current dependency, and there is a disadvantage that the terminal voltage varies greatly depending on the magnitude of the surge current. For example, the limit voltage at 1500 A is about twice that at 1 mA. That is, the terminal voltage of the element greatly changes depending on the magnitude of the intruding lightning surge current, making it difficult to design with high accuracy.

Since the varistor has the above-mentioned disadvantages, it cannot perform an effective surge protection function even when incorporated in a modular jack. If it is mounted in a modular jack and applied to a high-speed communication line, the surge withstand capability is limited to at most several tens of degrees.

Therefore, the present invention has a surge absorption capacity of several hundreds of amperes to several hundreds of amperes, can reduce common mode electromagnetic noise, and has excellent transmission characteristics up to several tens of MHz (insertion loss = normal mode attenuation). Noise and surge combined protection E
An object is to provide an MC connector.

[0012]

According to the present invention, a semiconductor lightning surge protection element comprising a bidirectional two-terminal thyristor is arranged in parallel with a communication line of a connector, and a common mode choke coil is arranged in series with the communication line. Accordingly, the present invention relates to an apparatus for reducing a lightning surge current (voltage) and electromagnetic noise at a connector output. According to the present invention, a plurality of communication lines are provided, and a desired pair of the communication lines
1st bidirectional 2-terminal thyristor is connected between only lines
And between each communication line of the desired pair and a ground terminal.
A second bidirectional two-terminal thyristor and a third bidirectional, respectively.
Thyristor and connect all the communication lines.
In the modular jack connector Ru Do <br/> connect the common mode choke coil in series with the signal line, the winding terminal side or inside free space on the opposite side of the coil winding portion of the bobbin of the common mode choke coil It said first, second
And integration with the third bidirectional diode thyristor connected in a U-shape, the common mode choke coil and the first, the second and third bidirectional two-terminal thyristor integrally mounted An EMC connector for combined noise and surge protection is provided within a modular jack housing.

[0013] A small-sized, high surge withstand and low capacitance semiconductor element, in particular, a bidirectional two-terminal thyristor is used as a surge protection element, and a common mode noise elimination coil described in the above-mentioned publication is adopted. At the connector output end, the lightning surge current (voltage)
It is possible to realize an EMC connector for noise / surge combined protection with an attenuation of 40 dB, an attenuation of common mode noise of 20 dB or more, and an insertion loss of almost zero up to 20 MHz. In particular, according to the present invention, the empty space in the housing of the modular jack can be effectively used,
The size can be reduced.

[0014] Before the first bidirectional diode thyristor
Serial incorporated into the winding terminal side of the internal empty space of the coil winding portion of the bobbin of the common mode choke coil, the second
And integration within empty space on the side opposite to the third winding terminal of the coil winding portion of the bobbin of the bidirectional two-terminal thyristor the common mode choke coil, the common mode wherein a choke coil first, second And the third bidirectional two-terminal thyristor are preferably integrally mounted and housed in the housing of the modular jack. With this configuration, the empty space in the housing of the modular jack can be used more effectively, and the size can be further reduced.

According to the present invention, furthermore, the communication line is constituted by a plurality of pairs of communication lines, and a pair of communication lines is provided between all the communication lines.
Connect a directional two-terminal thyristor and
Two-way two-terminal thyristor between the signal line and the ground terminal
And connect all the communication lines in series to the
In the modular jack connector to connect the down mode choke coil ing, while mounted on the main board of the common mode choke coil disposed in the housing base top, the Como the bidirectional two-terminal thyristor
An EMC connector for combined noise and surge protection provided in a housing of a modular jack mounted on both sides of a sub board arranged perpendicular to the main board outside of the mode choke coil . Since a large number of bidirectional two-terminal thyristors are mounted on both sides of the vertically arranged sub-board, an empty space in the housing of the modular jack can be effectively used, and downsizing can be achieved.

According to the present invention, furthermore, in a flat connector consisting of four wires, a bidirectional two-terminal thyristor is connected between each pair of input connection terminals of the four-wire communication line, and a four-wire input is provided. A bidirectional two-terminal thyristor is connected between the connection terminal and the ground terminal, a common-mode choke coil is connected in series with each of the four-wire input connection terminals, and the common-mode choke coil and the bidirectional two-terminal thyristor are connected. In a noise / surge combined protection EMC connector with a flat connector and a two-wire flat connector, a bidirectional two-terminal thyristor is connected between two-wire input connection terminals, and a two-wire input connection is made. A bidirectional two-terminal thyristor is connected between each terminal and the ground terminal, and a common mode is connected in series with each of the two-wire input connection terminals. Connect Yokukoiru, common mode choke coil and a bidirectional 2 incorporating a terminal thyristor in flat connector noise and surge composite protective for E
An MC connector is provided.

[0017]

FIG. 2 is an equivalent circuit diagram showing an embodiment of an EMC connector for combined noise and surge protection according to the present invention.

This embodiment is an example of a modular jack having eight slits and eight wires, and a bidirectional two-terminal thyristor is incorporated as a surge protection element in a housing of the modular jack, and a choke coil is incorporated for removing common mode noise. Things.

In FIG. 1, reference numerals 1 to 8 denote input side connection terminals,
1 'to 8' indicate output-side connection terminals, and 9 indicates a ground terminal. Of the input connection terminals 1 to 8 of the communication line,
Only bidirectional 2-terminal thyristors Zd1, Zc1 and Zc2 are connected in parallel to only terminals that become arbitrary paired transmission lines (here, terminals 4 and 5 are taken as examples), and common to all terminals 1 to 8. Mode choke coils L1 to L8
Are connected in series. However, the bidirectional two-terminal thyristor Zd1 is connected between the terminals 4 and 5, and the bidirectional two-terminal thyristors Zc1 and Zc2 are connected between the terminals 4 and 5 and the ground terminal 9, respectively.

The bidirectional two-terminal thyristor Zd1 is effective against a surge entering as a normal mode, and the bidirectional two-terminal thyristors Zc1 and Zc2 are effective against a surge input as a common mode. Generally, since a lightning surge voltage is induced in a line as a common mode, an input surge is applied to a bidirectional two-terminal thyristor Zc1.
And Zc2 to the ground terminal 9. Therefore, the lightning surge voltage input to the communication lines 4 and 5 does not appear at the output terminals 4 'and 5' of the modular jack, and the equipment connected to the next stage can be protected from high voltage / high current surge. .

The common mode choke coils L1 to L8 connected in series to all communication lines are those described in the above-mentioned publications.
A distributed winding portion in which each pair of communication lines is distributed and wound with a space between adjacent windings is provided. By distributing and winding the core with a space between the adjacent windings as described above, the floating capacitance between the windings of the paired wires can be reduced, and the wire enters the communication line even in a high-frequency region. Good rejection characteristics against common mode noise can be obtained. In addition, a concentrated winding portion that is concentratedly wound without any space between adjacent windings may be provided. By concentrating the pair of communication lines in this way, it is possible to increase the number of turns and increase the self-inductance in the low-frequency region. As a result, even in the low-frequency region, a good blocking characteristic against the common mode noise current is obtained. Can be obtained. By providing both the distributed winding part and the concentrated winding part,
The stray capacitance increases in the concentrated winding portion, but the distributed winding portion also exists, so the overall stray capacitance does not become very large.In addition, the increase in the self-inductance due to the concentrated winding portion combined with the excellent noise over a wide band Suppression ability can be obtained.

FIG. 3 is an equivalent circuit diagram showing another embodiment of the EMC connector for combined noise and surge protection of the present invention.

This embodiment is also an example of an eight-slit, eight-wire modular jack, in which a bidirectional two-terminal thyristor is incorporated as a surge protection element in a housing of the modular jack, and a choke coil is installed for removing common-mode noise. It is. In FIG. 1, reference numerals 1 to 8 denote input connection terminals, 1 'to 8' denote output connection terminals, and 9 denotes a ground terminal. Communication line input side connection terminal 1
, The bidirectional two-terminal thyristors Zd1 to Zd4 are connected between the terminals serving as the paired line transmission line, and the bidirectional two-terminal thyristors Zc1 are connected between all the terminals 1 to 8 and the ground terminal 9. Zc8 are connected to each other, and
Common mode choke coils L1 to L1
L8 are connected in series.

Bidirectional two-terminal thyristors Zd1 to Zd4
Is effective against a surge entering as a normal mode, and the bidirectional two-terminal thyristors Zc1 to Zc8 are effective against a surge input as a common mode. Generally, since a lightning surge voltage is induced in a line as a common mode, an input surge is applied to a bidirectional two-terminal thyristor Z.
It is bypassed to the ground terminal 9 via c1 to Zc8. Therefore, the lightning surge voltage input to the communication lines 1 to 8 does not appear at the output terminals 1 'to 8' of the modular jack,
Equipment connected to the next stage can be protected from high voltage and high current surges.

The connected common mode choke coil L
The configurations, functions, and effects of 1 to L8 are the same as those in the embodiment of FIG.

FIG. 4 shows the voltage-current characteristics of the bidirectional two-terminal thyristor used in the above embodiment. In the normal state, the voltage between terminals of this element is equal to or lower than the breakover voltage VBO (VBO is usually 100 V to 270
V), no current flows. That is, it is equivalent to the released state. On the other hand, when a high voltage induced by a lightning surge or the like is applied between the terminals and the voltage between the terminals becomes equal to or higher than the breakover voltage VBO, the element switches to a conductive state as shown in FIG. 4 and a large current flows. Since this element has a bidirectional characteristic, it can be switched to a conductive state if the breakover voltage is exceeded for any of the positive and negative voltages.

FIG. 5 shows a surge response characteristic of the bidirectional two-terminal thyristor. When a surge current (voltage) having the characteristic shown in FIG. 2B is input, the response voltage (terminal voltage) of the element becomes as shown in FIG. 2A. When the terminal voltage exceeds VBO, the response voltage instantaneously increases. To a conductive state. The switching time is on the order of 100 nsec. In addition, unlike a varistor, VBO does not fluctuate according to the magnitude of the input voltage, and VBO does not fluctuate due to the input surge waveform.

FIG. 6 is an external perspective view specifically showing a structural example of the modular jack in the embodiment of FIG. 2, and FIG. 7 is an exploded perspective view showing the expanded structure.

6 and 7, reference numeral 10 denotes a housing base, and 11 denotes a housing cover. The housing base 10 includes a spring terminal assembly 15
, A common mode choke coil including a divided core 12, a coil bobbin 13, and a coil (not shown), and a surge protection assembly 14. The spring terminal assembly 15 includes the same number of spring contact terminals 15a as the number of communication lines to be connected. The coil bobbin 13 includes a coil winding portion 13a, a terminal 13b for connecting a spring contact terminal, and a terminal 13c for connecting a printed wiring board. Both ends of each coil (not shown) are electrically connected to terminals 13b and 13c, respectively. The terminals 13b are electrically connected to the respective spring contact terminals 15a.

The surge protection assembly 14 includes a bidirectional 2
Bidirectional 2-terminal thyristor Zc is connected to terminal thyristor Zd1
1 and Zc2 are connected in a U-shape, and one end of each of the bidirectional two-terminal thyristors Zc1 and Zc2 is connected to the ground terminal 9. The surge protection assembly 14 is a coil winding portion of the coil bobbin 13. 13a. As a result, the space can be effectively used, and the size can be reduced.

When assembling the modular jack, the spring terminal assembly 15 is first incorporated into the housing base 10. Next, the common mode choke coil on which the surge protection assembly 14 is mounted is electrically connected to the spring terminal 15a, and is assembled on the rear side of the housing. Then, the housing cover 1
1 are fixed, and fixing pins 16 and 16 'for fixing the modular jack to, for example, a printed board are driven in and fixed.

As a result of terminating the output terminal of the EMC connector for combined noise and surge protection according to this embodiment with 110Ω and applying a surge voltage (1.2 / 50 μs) to the input terminal, the amount of attenuation of the surge current at the output terminal is as follows. About 38dB
Met. That is, according to the EMC connector for combined noise and surge protection, the input surge current can be reduced to about 1/100. Since the voltage is specified by the breakover voltage of the element, even if a voltage of 30 kV is input, the voltage can be set to about 100 V.

The surge withstand capability of the EMC connector for combined noise and surge protection is as follows: the chip size of the bidirectional two-terminal thyristor is 220 μm in thickness and 2.0 × 2.0 mm in area.
800A when using ^two devices, 1700A when using elements having a thickness of 220μm and area 2.8 × 2.8 mm ²
Met. This is, for example, as described in Japanese Patent Application Laid-Open Nos. 5-74321 and 6-53487, which have already been filed and known by the present applicant.
It can be easily realized by using a bidirectional two-terminal thyristor having a high surge resistance.

FIG. 8 shows an example of the transmission characteristics of the EMC connector according to this embodiment. As is clear from the figure,
The attenuation in the normal mode, that is, the insertion loss, is almost zero up to 20 MHz, indicating excellent transmission characteristics. This is realized because the capacitance of the bidirectional two-terminal thyristor inserted in parallel to the communication line is small. The common mode attenuation is about 25 dB up to 20 MHz, and has excellent noise suppression characteristics. This is achieved by a common mode choke coil inserted in series with the communication line.

FIG. 9 is an exploded perspective view showing a part of a modification of the structural example of the modular jack shown in FIGS. In this modification, the surge protection assembly 14 shown in FIG. 7 is configured to be mounted inside the bobbin 13 on the side opposite to the winding terminal of the coil winding portion 13a. The other structures, functions, and effects are exactly the same as those in FIGS.

FIG. 10 is an exploded perspective view showing a part of still another modification of the structural example of the modular jack shown in FIGS. In this modification, the surge protection assembly is divided into two parts (14a 'and 14b'), and the bidirectional two-terminal thyristor Zd1 is provided inside the bobbin 13 on the winding terminal side of the coil winding part 13a. And two-way
The terminal thyristors Zc1 and Zc2 are connected to the coil winding portion 13a.
Are mounted on the opposite side of the winding terminal. With this configuration, the space can be used more effectively, and the size can be further reduced. The other structures, functions, and effects are exactly the same as those in FIGS.

FIG. 11 is a partially cutaway perspective view specifically showing a structural example of the modular jack in the embodiment of FIG. 3, and FIG. 12 is a sectional view showing the internal structure.

In these figures, the same components as those in FIGS. 6 and 7 are denoted by the same reference numerals. In this structural example, the surge protection assembly and the common mode choke coil are not mounted integrally, but are mounted as independent boards. That is, the bidirectional two-terminal thyristors Zd1 to Zd4 and Zc1 to Zc8 are
7, a common mode choke coil is mounted on a main board 18, and the sub-board 17 and the main board 18 are accommodated in a housing of a modular jack. The operation and effect of this embodiment are exactly the same as those of the above-described embodiment.

FIG. 13 is a partially cutaway perspective view specifically showing a structural example of a connector according to another embodiment of the present invention.

In this structural example, the bidirectional two-terminal thyristors Zd1, Zd2 and Zc are provided in the flat connector 20.
1 to Zc4 and the common mode choke coil 21 are incorporated. In the figure, T1 to T4 are input connection terminals of a four-line communication line, and T1 'to T4' are output connection terminals. In this example, the connection terminals T1 and T2 and the connection terminals T3 and T4 are paired, respectively. That is, the bidirectional two-terminal thyristors Zd1 and Zd2 for normal mode surge protection are connected to the pair terminal T1-T.
2 and between T3 and T4, one end of each of the bidirectional two-terminal thyristors Zc1 to Zc4 for protecting the common mode surge is connected to each of T1 to T4. The other end of Zc4 is commonly connected and connected to a ground terminal (not shown) and grounded. The operation and effect of this embodiment are exactly the same as those of the above-described embodiment.

FIG. 14 is a partially cutaway perspective view specifically showing a structural example of a connector according to still another embodiment of the present invention.

In this structural example, the bidirectional two-terminal thyristors Zd1, Zc1, and Zc
2 and the common mode choke coil 23. In the figure, T1 and T2 are input-side connection terminals of a two-line communication line, and T1 'and T2' are output-side connection terminals. In this example, the connection terminals T1 and T2 are a pair of pairs. That is, a bidirectional two-terminal thyristor Zd1 for protection against normal mode surge is connected between the pair terminals T1 and T2, and a bidirectional two-terminal thyristor for protection against common mode surge incorporated in both sides of the core. One ends of Zc1 and Zc2 are connected to T1 and T2, respectively, and the other ends of these bidirectional two-terminal thyristors Zc1 and Zc2 are connected in common and connected to a ground terminal (not shown) and grounded. The operation and effect of this embodiment are exactly the same as those of the above-described embodiment.

FIG. 15 is a partially cutaway perspective view specifically showing a structural example of a connector according to still another embodiment of the present invention.

In this structural example, a plurality of bidirectional two-terminal thyristors Zdi and Zci and a common mode choke coil 25 are incorporated in a D-sub connector 24.
In the figure, reference numeral 26 denotes a cable to which a signal is input;
Is an output connector pin. The plurality of bidirectional two-terminal thyristors Zdi and Zci and the common mode choke coil 25 are mounted on a printed circuit board 28 and housed in the housing of the D-sub connector 24. The operation and effect of this embodiment are exactly the same as those of the above-described embodiment.

The embodiments described above are all illustrative of the present invention and not restrictive, and the present invention can be embodied in various other modified and modified forms. Therefore, the scope of the present invention is defined only by the appended claims and their equivalents.

[0046]

As described above, according to the present invention, a bidirectional two-terminal thyristor and a common mode choke coil having a small size and a high surge withstand capability are incorporated in a communication connector.
Since the former is connected in parallel with the communication line and the latter is connected in series with the communication line, excellent surge protection capability and common mode noise suppression effect can be realized. In particular, a bidirectional two-terminal thyristor, which functions as a surge protection element and is inserted in parallel with a communication line, has a small chip size and a high surge withstand capability, so that a low capacitance can be achieved. Excellent insertion loss characteristics are obtained up to the region. Therefore, the EMC connector for combined noise and surge protection of the present invention is 10 Mb /
s high-speed LAN lines and the like.

Further, since the bidirectional two-terminal thyristor is small, a plurality of elements can be easily mounted in the communication connector, and the EMC connector for combined noise and surge protection can be downsized. In addition to the contribution, the miniaturization of the mounting board also contributes to the improvement of the frequency characteristics.
In particular, according to the present invention, the empty space in the housing of the modular jack can be effectively used, and the size can be reduced.

[Brief description of the drawings]

FIG. 1 is a diagram showing the current dependency of a limiting voltage of a varistor.

FIG. 2 is an equivalent circuit diagram showing an embodiment of an EMC connector for combined noise and surge protection according to the present invention.

FIG. 3 is an equivalent circuit diagram showing another embodiment of the EMC connector for combined noise and surge protection according to the present invention.

FIG. 4 is a voltage-current characteristic of a bidirectional two-terminal thyristor used in the embodiments of FIGS. 2 and 3;

FIG. 5 is a characteristic diagram showing a surge response characteristic of a bidirectional two-terminal thyristor.

FIG. 6 is an external perspective view specifically showing a structure of a modular jack in the embodiment of FIG. 2;

FIG. 7 is an exploded perspective view showing a development structure of the modular jack of FIG. 6;

FIG. 8 shows a combined noise and surge protection E according to this embodiment.
FIG. 4 is a characteristic diagram illustrating an example of a transmission characteristic of an MC connector.

FIG. 9 is an exploded perspective view showing a part of a modified example of the structural example of the modular jack shown in FIGS. 6 and 7.

FIG. 10 is an exploded perspective view showing a part of still another modification of the structural example of the modular jack shown in FIGS. 6 and 7.

11 is a partially cutaway perspective view specifically showing a structural example of a modular jack in the embodiment of FIG. 3;

FIG. 12 is a sectional view showing an internal structure of the modular jack of FIG.

FIG. 13 is a partially broken perspective view specifically showing a structural example of a connector according to another embodiment of the present invention.

FIG. 14 is a partially cutaway perspective view specifically showing a structural example of a connector according to still another embodiment of the present invention.

FIG. 15 is a partially broken perspective view specifically showing a structural example of a connector according to still another embodiment of the present invention.

[Explanation of symbols]

Zc1 to Zc8, Zd1 to Zd4 Bidirectional 2-terminal thyristor L1 to L8, 21, 23, 25 Common mode choke coil 1 to 8 Input side connection terminal 1 'to 8' Output side connection terminal 9 Ground terminal 10 Housing base 11 Housing Cover 12 Core 13 Coil bobbin 13a Coil winding 13b Spring contact terminal connection terminal 13c Printed wiring board connection terminal 14, 14a ', 14b' Surge protection assembly 15 Spring terminal assembly 15a Spring terminal 16, 16 'Fixing pin 17 Sub-board 18 Main board 20, 22 Flat connector 24 D-sub connector 26 Cable 27 pin 28 Printed board

Continued on the front page (72) Inventor Seiichi Miyashita Nippon Telegraph and Telephone Corporation 3-1-2, Nishi-Shinjuku, Shinjuku-ku, Tokyo (72) Inventor Kunio Takagi 1-3-1, Gotenyama, Musashino City, Tokyo (56) References JP-A-4-209482 (JP, A) JP-A-8-236312 (JP, A) JP-A-4-209481 (JP, A) JP-A-7-106138 (JP, A)

Claims (3)

(57) [Claims] 1. A communication system comprising : a plurality of pairs of communication lines;
First bidirectional two terminals between only the desired pair of communication lines
Connect the thyristor and connect with each communication line of the desired pair.
A second bidirectional two-terminal thyrist between the ground terminal
And a third bidirectional two-terminal thyristor,
Common mode choke coaxial in series with all communication lines
In the modular jack connector to connect the yl ing, before the winding terminal side or inside free space on the opposite side of the coil winding portion of the bobbin of the common mode choke coil
Serial first, built to connect the second and third bidirectional two-terminal thyristor in a U-shape, and the common mode choke coil and the first, the second and third bidirectional diode thyristor An EMC connector for combined noise and surge protection characterized by being integrally mounted and housed in a modular jack housing. 2. The second and third bidirectional thyristors are incorporated in an internal empty space on a winding terminal side of a coil winding portion of a bobbin of the common mode choke coil. the two-terminal thyristor winding terminal of the coil winding portion of the bobbin of the common mode choke coil built inside the empty space on the opposite side, the common mode choke coil and the first, second and third bidirectional The EMC connector according to claim 1, wherein the two-terminal thyristor is integrally mounted and housed in a housing of the modular jack. 3. The communication line, comprising a plurality of pairs of communication lines.
Two-terminal thyristor between all communication lines that make a pair
And between each of the communication lines and the ground terminal.
A bidirectional two-terminal thyristor is connected to each
Common mode choke coil in series with all communication lines
In the modular jack connector ing by connecting, the common mode choke coil housing base on
Mounted on the main board disposed in the section, and the bidirectional two-terminal thyristor is mounted on the common mode choke coil.
Characterized in that it is mounted on both sides of a sub-substrate vertically arranged with respect to the main board outside the main board and housed in a housing of a modular jack.
C connector.