JP2926681B2 - Overvoltage protection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a highly practical overvoltage capable of simplifying and effectively protecting various communication devices and data processing devices from overvoltage applied through a communication line due to induced lightning or the like. It relates to a protection device.

[0002]

[Related Background Art] In recent years, the development of information communication technology via communication lines has been remarkable, and large-scale databases installed in, for example, information processing centers using personal computers and the like installed in offices and homes. It has become easier to access. Network services for exchanging information between a plurality of personal computers via telephone lines have also become widespread.

[0003] This type of communication line, for example, a public telephone line, is led into a business office or home through a protector and connected to a data processing device such as a personal computer through indoor wiring. Especially recently, modular type connectors (modular plug and modular outlet) have become widespread, and the modular plug of the signal cable extended from the data processing device is attached to the modular outlet connected to the indoor wiring. It has become possible to easily connect a data processing device (the same applies to a telephone, a facsimile device, a data communication modem, etc.) to a communication line.

[0004]

By the way, communication lines such as public telephone lines, especially signal cables, are laid vertically and horizontally across a plurality of cities and also over a wide area, not only in urban spaces. For this reason, an excessive voltage due to induced lightning is often applied to the communication line in an area where lightning occurs, and an excessive current (surge current) may flow through the communication line due to this. Such surge voltage causes damage to data processing devices and the like connected to the communication line and causes data destruction.
Therefore, it is necessary to protect the data processing device from surge voltage.

Conventionally, in order to cope with the above-mentioned surge voltage, an overvoltage protection circuit is incorporated in a protector provided at an entrance of a communication line in an office or a home, for example. Some measures have been taken to prevent application to the processing device. This overvoltage protection circuit is generally constructed by interposing a surge protection element such as a lightning arrester (gas tube arrester) or a zinc oxide varistor between a pair of communication lines (signal lines) forming the communication line. Is done. Incidentally, the gas tube arrester and the zinc oxide varistor may be interposed in two stages, and a diode bridge circuit may be inserted in the subsequent stage (multistage protection).

However, the characteristics of gas tube arresters and zinc oxide varistors change with time due to repetition of impulse current, and it is generally impossible to monitor how much surge voltage is guaranteed. Moreover, maintenance and inspection of the protector in which this kind of overvoltage protection circuit is incorporated is entrusted to a qualified technician, and the user cannot perform maintenance and improvement without permission. It is very rare that the above-mentioned overvoltage protection circuit is incorporated in the data processing device. Therefore, even though the surge voltage caused by the induced lightning may have an adverse effect on the data processing device, the user cannot take any measures.

[0007] The present invention has been made in view of such circumstances, and an object of the present invention is to provide an overvoltage protection device that can easily and effectively protect a data processing device from a surge voltage on the user side. It is in.

[0008]

In order to achieve the above-mentioned object, an overvoltage protection device according to the present invention is detachably mounted on an outlet having a signal line connected to a connection terminal, and connection contacts are respectively connected to the connection terminals. The plug body includes a silicon two-way two-terminal thyristor interposed between the connection contacts of the plug body and made conductive by an overvoltage applied from the signal line via the outlet to absorb the overvoltage. It is characterized by.

That is, apart from the protector, the plug itself which is attached to and detached from the outlet of the indoor wiring led from the protector,
A built-in silicon two-way two-terminal thyristor that bypasses the overvoltage applied from the outdoor communication line through the protector and further through the outlet, thereby preventing the application (propagation) of the overvoltage to the data processing device. It is characterized by having.

[0010] In particular, the invention according to claim 2 is a preferred form of the plug main body, which is integrally provided with an outlet portion to which a plug to which a signal cable is connected is detachably mounted.
A relay adapter structure is interposed between the plug and the outlet to interconnect them. According to a third aspect of the present invention, as another form of the plug main body, the plug main body is realized as, for example, a modular plug having a connection terminal portion to which a signal cable is connected.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an overvoltage protection device according to an embodiment of the present invention will be described with reference to the drawings. FIG.
1 is a sectional view showing a schematic configuration of an overvoltage protection device realized as a modular plug, wherein 10 is a modular plug main body, and 20 is a silicon two-way two-terminal thyristor. The modular plug body 10 is mainly composed of polycarbonate, has a shape conforming to the FCC standard, and is detachably attached to a pair of modular outlets.

The structure of the modular plug body 10 will be described. An opening 12 into which a signal cable 30 is inserted is provided on the rear side of a body 11 having a substantially rectangular parallelepiped shape. A cord insertion hole 13 communicating with the opening 12 is provided to the front side of the main body 11. A plurality of contact grooves 14 are provided in a portion extending from a lower portion on the front side of the main body portion 11 to a bottom portion thereof, and each of the contact grooves 14 has a connection contact plate 1.
5 are provided in a half-pressed state as shown in FIG. In the example shown in FIG.
Has an L-shape, and a needle-like contact pin 16 is formed at the upper end thereof.

In order to attach the signal cable 30 to the modular plug body 10 having the above-described structure, first, the sheath insulator 31 of the signal cable 30 is removed by a predetermined length, and the inner insulator 32 inside the signal cable 30 is individually removed. The plurality of signal lines 33 covered with are exposed. Then, as shown in FIG. 1A, the signal line 33 is inserted into the core wire insertion hole 13 from the opening 12 while being covered with the inner insulator 32. In this state, using a hand tool (not shown) conforming to the FCC standard, the connection contact plate 15 is press-fitted toward the core wire insertion hole 13 side, and the contact pin 16 is pierced through the inner insulator 32 to generate the signal. The electrical connection is made by making contact with each of the lines 33. At this time, the lower surface side portion of the opening 12 is heated and deformed, and the distal end portion of the signal cable 30 where the outer insulating material 31 is left is pressed against the inner surface of the opening portion 12 to be pinched and fixed. The signal cable 30 is attached to the modular plug main body 10.

A lever 17 integrally provided on the upper surface side of the main body portion so as to be rotatable with its front end as a hinge portion,
A shoulder (not shown) projecting to both sides is formed in the middle part. The modular plug body 10 can be attached to and detached from a modular outlet (not shown) without being hindered by the shoulder due to the elastic deformation of the lever 17 downward (upper side of the main body) through the hinge. The modular plug body 10 is a modular plug.
When the lever 17 is resiliently restored in a state of being attached to the outlet, the shoulder engages with the recess formed in the upper space wall surface of the modular outlet, thereby removing the modular plug body 10. Is to be blocked.

The silicon two-way two-terminal thyristor 20 built in the modular plug body 10 having such a structure is packaged in a surface mount package or a button package as shown in FIGS. 2A and 2B, for example. The shape has The thyristor 20 press-fits the connection contact plate 15 of the modular plug main body 10 and
Is attached to the terminal portion 21, the specific connection contact plate 15
Are provided so as to be pressed against each other. The specific connection contact plates 15 are pressed against the two terminal portions 21 of the silicon two-way two-terminal thyristor 20, respectively.
The silicon two-way two-terminal thyristor 20 is interposed between these connection contact plates 15 and, furthermore, between the signal lines 33 to which these connection contact plates 15 are connected.

[0016] and the silicon bidirectional two-terminal thyristor in rollers 20, for example a composite thyristor of the planar type 5-layer structure having an element structure shown in FIG. 3 (a), FIG. 3 is equivalently (b ), A composite element in which two thyristors are connected in parallel in opposite directions. Incidentally, a four-layer structure is also being developed.

As shown in FIG. 4, when the applied voltage is low, the junction J2 is maintained in a reverse bias state, and the thyristor 20 maintains an off state (region A). When the applied voltage V approaches the breakdown voltage VB of the junction J2, avalanche breakdown occurs at the junction J2, and when the voltage exceeds the breakover voltage VBO, a current i2 flows immediately below the P1 layer (region B). ). Then, a voltage drop (i2.times.R2) caused by the current i2 is applied to the junction J2. When the voltage drop reaches the diffusion potential VB1 of the junction J2, injection of carriers from the P1 layer into the N2 layer starts, and the current i1 flows ( Region C).
As a result, the sum of the current amplification factor α1 of the transistor formed of the N2-P3-N4 layer having current dependency and the current amplification factor α2 of the transistor formed of the P1-N2-P3 layer becomes [1], and the thyristor 20 Is turned on. After the ON state, the ON voltage VT according to the forward voltage drop VF of the PN junction diode is shown (region D).

Such an action occurs in accordance with the polarity of the voltage applied to the thyristor 20, and therefore exhibits a bipolar (bidirectional) symmetric VI characteristic. A silicon two-way two-terminal thyristor 20 having characteristics as described above is
For example, as shown in FIG. 5, if an intervening circuit is provided in front of a protected circuit (data processing device) connected to a line having a predetermined load RL, as shown in FIG. During the normal operation in which the voltage VB is applied, the thyristor 20 does not conduct, and the line current iL is supplied to the protected circuit as it is.

However, when an excessive surge voltage Vsurge due to induced lightning or the like is applied to the line, the thyristor 20 is instantaneously turned on when the voltage exceeds the breakover voltage VBO, and the surge current isurge is applied to the thyristor 2.
0 is bypassed. At this time, only the ON voltage VT is generated at both ends of the thyristor 20, so that the excessive surge voltage Vsurge is not applied to the protected circuit. And the surge current isurge gradually decreases,
When the holding current of the thyristor 20 becomes equal to or less than the holding current IH, the thyristor 20 is turned off, and the operation mode is shifted to the above-described normal operation mode.

Therefore, according to the present device, the silicon two-way two-terminal thyristor 20 having such operating characteristics is built in the modular plug main body 10 as described above, and is interposed between predetermined signal lines 33. When a surge voltage Vsurge from a communication line caused by an induced lightning is applied to a plug portion which is a tip of a signal cable 30 extended from a data processing device and a connection portion to a modular outlet, a silicon two-way is thereby generated. 2 terminal thyristor 2
0 conducts, and the surge current Isurge depending on the surge voltage Vsurge is bypassed. And the signal cable 30
Of the thyristor 20 (on-voltage VT). In other words, the surge voltage Vsu applied to the modular plug from the communication line through the protector and indoor wiring, and further through the modular outlet
The rge is short-circuited and absorbed by the conduction of the thyristor 20 incorporated in the modular plug body 10.

As a result, the surge voltage Vsurge is not applied from the modular plug body 10 to the data processing device via the signal cable 30, and the data processing device can be effectively protected from the surge voltage Vsurge. It becomes possible. In particular, according to the configuration described above, the surge voltage Vsurg applied via the communication line in the modular plug that can be freely handled on the user side.
Since further propagation of e can be prevented, even if the protector does not incorporate an overvoltage protection circuit such as a gas tube arrestor or zinc oxide varistor, Thus, it is possible to effectively take a protective measure against the surge voltage Vsurge. That is, even a user who does not have a special qualification such as a construction engineer can effectively protect the data processing device from the surge voltage Vsurge caused by the induced lightning, and can effectively function as a self-defense means. .

The surge voltage V applied between specific signal lines
In order to protect the device to be protected from surges, the thyristor 20 may be interposed between the lines as shown in FIG. 7 (a), and between each signal line and the ground line. To protect the device to be protected from the applied surge voltage Vsurge, two silicon two-way two-terminal thyristors 20 are interposed between the lines in a cascade as shown in FIG. What is necessary is just to make it ground.

In the above-mentioned example, the silicon plug is directly connected to the modular plug mounted on the signal cable 30.
Although the directional two-terminal thyristor 20 has a built-in structure, it may be realized as a relay adapter structure interposed between a modular plug and a modular outlet. FIG. 8 is a schematic configuration diagram showing an example of such a case. Reference numeral 40 denotes a modular outlet having a connection terminal 41 connected to a signal line of an indoor wiring, and reference numeral 50 denotes a signal cable 3.
0 and the modular outlet 40
A modular plug 60 forms a pair with the modular plug, and 60 is a modular type relay adapter constituting an overvoltage protection device according to the present invention.

The front end of the relay adapter 60 has a modular plug structure 61, and the rear end has a modular outlet structure 62. In the plug structure 61 and the outlet structure 62, the plurality of connection contact portions 63 and the connection terminal portions 64 arranged in parallel with each other form an integrated structure connected to each other inside the connection contact portion 63 and the connection terminal portion 64.
And the connection plug 51 of the modular plug 50 is electrically connected. Silicon two-way two-terminal thyristor 2 built into relay adapter 60
Reference numeral 0 is interposed between the connection contact portions 63 (connection terminal portions 64). The thyristor 20 is connected to the connection contact 63
When the surge voltage Vsurge applied between the (connection terminal portions 64) is received, the connection is made conductive, and the connection contact portions 63 (connection terminal portions 64) are substantially short-circuited, thereby allowing the surge voltage Vsurg as described above.
Plays a role in absorbing e.

Thus, according to the relay adapter 60 having the above-described configuration, the signal cable 3 extended from the data processing device can be used.
The modular plug 50 is mounted between the modular plug 50 mounted at the end of the plug 0 and the modular outlet 40 to which the modular plug 50 is originally mounted, and through the relay adapter 60. Is connected to the modular outlet 40, even if the surge voltage Vsurge caused by the induced lightning from the communication line is applied to the modular outlet 40, the surge voltage Vsu
Since the rge is absorbed by the thyristor 20 of the relay adapter 60, the surge voltage Vsurge is not transmitted to the data processing device via the modular plug 50 and the signal cable 30. Therefore, the data processing device can be effectively protected from the surge voltage Vsurge.

In particular, if the overvoltage protection device according to the present invention is realized as the above-described relay adapter 60, the surge can be effectively prevented at the connection portion between the modular plug and the modular outlet while using a general-purpose modular plug. The voltage Vsurge can be absorbed. Moreover, it is possible to easily take a protective measure against the surge voltage Vsurge simply by adding the relay adapter 60 by the user.

The present invention is not limited to the above embodiment. For example, if the modular outlet is not embedded in the wall and forms part of the indoor wiring,
Specifically, when the modular outlet 40 is provided on the data processing device side, the surge voltage Vsurg applied via the signal cable 30 to which the modular plug body 10 or the modular plug 50 is connected.
e is absorbed by the silicon two-way two-terminal thyristor 20 incorporated in the modular plug body 10 or the relay adapter 60, and the surge voltage Vsurge to the modular outlet 40 and, consequently, to the data processing device.
Will be blocked.

[0028] Also the number of connection terminals in or connectors not specifically limited, if it has three or more connection terminals (signal line), the thyristor 20 described above between the connection terminals with a possibility that a surge voltage Vsurge is applied Should be interposed. When the present device is realized as the relay adapter 60, the external shape and the like may be determined according to the specifications while complying with the FCC standard. In short, the present invention can be variously modified and implemented without departing from the gist thereof.

[0029]

As described above, according to the overvoltage protection device of the present invention, a silicon two-way two-terminal thyristor is built in a plug body detachably attached to an outlet to which a signal line is connected. Since a two-way two-terminal thyristor is interposed between the connection contacts of the plug body to absorb overvoltage applied from the signal line via the outlet, the outlet and the protector can be connected via the plug body. A data processing device connected to an outdoor communication line via the communication line can be effectively protected from an externally applied overvoltage. Moreover, it is possible for the user to independently protect against overvoltages applied from outside without touching the parts that should be entrusted to a professional construction engineer such as a protector. Simple and effective protection can be achieved.

[0030] According to the second aspect of the present invention, as a preferred form of the plug body, an outlet portion to which a plug connected to a signal cable is detachably mounted is integrally provided, and the plug and the outlet are connected to each other. Since it is realized as a relay adapter structure interposed therebetween and interconnecting them, handling thereof can be made very simple.

According to the third aspect of the present invention, as another form of the plug main body, the plug main body is realized as, for example, a modular plug having a connection terminal portion to which a signal cable is connected. Practically great effects such as being able to be made simpler are obtained.

[Brief description of the drawings]

FIG. 1 is a sectional configuration diagram showing an application example to a modular plug which is an embodiment of an overvoltage protection device according to the present invention.

FIG. 2 is a view schematically showing an external shape of a silicon two-way two-terminal thyristor incorporated in the overvoltage protection device according to the present invention.

FIG. 3 is a diagram showing an element structure of a silicon two-way two-terminal thyristor and a configuration of an electrical equivalent circuit thereof.

FIG. 4 is a diagram showing VI characteristics of a silicon two-way two-terminal thyristor.

FIG. 5 is a diagram showing an example of an overvoltage protection circuit using a silicon two-way two-terminal thyristor.

FIG. 6 is an operation characteristic diagram showing an overvoltage protection action by a silicon two-way two-terminal thyristor in the circuit shown in FIG. 5;

FIG. 7 is a diagram showing a basic usage example of a silicon two-way two-terminal thyristor.

FIG. 8 is a cross-sectional configuration diagram showing an application example to a modular relay adapter which is another embodiment of the overvoltage protection device according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Modular plug main body 15 Connection contact board 20 Silicon two-way two-terminal thyristor 30 Signal cable 40 Modular outlet 50 Modular plug 60 Modular type relay adapter

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-5-343210 (JP, A) JP-A-6-243934 (JP, A) JP-A-4-209482 (JP, A) 122277 (JP, U) Hikaru Hei 3-77372 (JP, U) Hikaru 2-71980 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) H01R 13/56-13 / 72 H02H 7/20 H02H 9/04

Claims (3)

(57) [Claims] 1. A modular console to which a signal line is connected.
Modular plug body detachably attached to
And the modular plug body,
・ The plug body is attached to the modular outlet
To the connection terminal of the modular outlet
A connection contact plate which is electrically connected to the modular plug body;
It is interposed between the plates, through the modular outlets from said signal line; and a silicon bidirectional two-terminal thyristor to absorb an overvoltage applied to the connection contact plates, the connection contact plate, the modular Press-fit into plug body
Fixable and press fit into the modular plug body
When attached to the modular plug body
Break through the inner insulation of the signal cable
Provide contact pins that contact the signal lines covered with the body.
And the silicon two-way two-terminal thyristor
A structure in which two electrodes are pressed into contact and electrically connected
An overvoltage protection device, comprising: 2. A modular console to which signal lines are connected.
Modular plug body detachably attached to
And the modular plug body,
・ The plug body is attached to the modular outlet
To the connection terminal of the modular outlet
A connection contact plate which is electrically connected to the modular plug body;
Interposed between the boards, and the modular
Absorbs the overvoltage applied between the connection contact plates via the cent
Silicon two-way two-terminal thyristor and said modular
-The signal cable is connected integrally to the plug body
Another modular plug is detachably mounted
A relay adapter structure with a modular outlet
And the connection contact plate is connected to the modular outlet.
An integral structure connected to the connection terminal,
.Silicon two-way two terminals built in the plug body
Make electrical contact with the thyristor electrodes by pressing them
Overvoltage protection device shall be the features that you incorporated. 3. The modular plug body according to claim 1, wherein
Covers the signal cable electrically connected to the connecting contact plate
Pressing and holding the jacket insulator to the modular plug body
The overvoltage protection device according to claim 1, further comprising a heating deformation portion to be mounted .