JP2000083321A - Line termination protector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable easy exchange of a damaged protective element even by a worker who is not skilled, make exchange by a submodule unit unnecessary, and enable treatment coping with a trouble of a communication circuit by exchange of only the damaged protective element in a short time. SOLUTION: This line termination protector is provided with a connector 17 for line termination in which an external line is inserted, a protective element accommodating case 33 in which one or a plurality of protective elements 18 to be used as overvoltage protective elements or overcurrent protective elements are accommodated exchangeably, and an output side connector 20. The protective elements 18 are electrically connected with the connector 17 for line termination and the output side connector 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention prevents overvoltages and overcurrents that enter a communication line due to induction or contact, etc., from flowing into a communication device, and terminates data necessary for input processing of the communication line. The present invention belongs to a technical field related to a line termination protector for efficiently performing output connection processing.

[0002]

2. Description of the Related Art In some cases, an outdoor communication line used for various communications generates an induced surge voltage or a large current due to contact with an induced lightning or a high-voltage wire. For this reason,
When an outdoor communication line is connected to various terminals such as a private branch exchange (PBX) and a computer, a line termination protector having an overcurrent protection element and a voltage protection element arranged between them is usually installed. In particular, semiconductor integrated circuits and other solid-state electronic components are frequently used as components of recent terminal equipment, and these components are vulnerable to high voltages and large currents. Is essential.

In addition, private branch exchanges, computers, and the like have been miniaturized, enhanced in function, and increased in capacity, and the line termination protectors used therein have been required to have higher performance. It is necessary to arrange protection elements such as an overcurrent protection element and an overvoltage protection element for each line. Therefore, when there is only one protection element because there is only one communication line, of course,
For line termination protectors that need to process a large number of lines due to the increase in the capacity of communication lines, it is particularly necessary to reduce the size of the line termination protectors and to easily replace them when the protection element fails. Is done. An overvoltage protection element that prevents the intrusion of a high voltage has many opportunities to be exposed to a high voltage, and has an extremely high probability of failure as compared with general electronic components. Also, the overcurrent protection element may be inevitably destroyed by performing the protection function. Therefore, it is necessary to facilitate the work of replacing a faulty overvoltage protection element.

FIG. 8 is a perspective view showing an example of a conventional line termination protector submodule 1, and FIG. 9 is a circuit diagram thereof. A subscriber communication cable (not shown), which is a drop-in wire 10, is connected to the line termination connector 2, and the line termination connector 2 is accommodated in a termination connector mounting case 3 to accommodate a line termination protector. Connect to module 1. Each circuit is connected to the printed wiring board 4 via the conductor 5 of the printed wiring board 4.
A connection for one of the plurality of semiconductor elements 6 which are protection elements mounted by soldering on the top, and a connection for testing an armature of a test armature unit 8 arranged on a printed wiring board via a conductor 7 Connected to the unit 12. Semiconductor element 6
Are arranged in close contact with each other to reduce the size of the entire submodule. The connection unit 12 for armature inspection is connected to the output connector 10 arranged on the printed wiring board 4 via the conductor 9, and is connected to the private branch exchange via the extension 14. The other electrode of semiconductor element 6 is connected to ground terminal 13.

[0005] The conventional line termination protector sub-module is:
For example, as shown in FIG. 8, a structure is employed in which a semiconductor element 6 serving as a protection element is soldered and fixed on the printed wiring board 4 in a state of being substantially adhered thereto. For this reason, there is a problem in that if one of the plurality of semiconductor elements fails, replacement is required for each sub-module.
This is because replacement work of the soldered semiconductor element requires appropriate work tools, and furthermore, the work requires skill, so that on-site repair is difficult.

[0006]

With respect to the conventional line termination protector sub-module, appropriate work tools are required for replacement of a failed protection element, and the replacement operation requires skill, so that protection is required. When a failure occurs in an element, there is a problem that the element must be replaced in units of submodules on site.

SUMMARY OF THE INVENTION An object of the present invention is to provide a line termination connector for inputting an external line connected to a subscriber cable, a protection element used as an overvoltage protection element or an overcurrent protection element, and a failure protection of the protector. The element can be easily replaced. The replacement of the protection element on the site where the line termination protector is installed is facilitated, and the replacement can be easily performed even by a skilled worker. Thus, it is not necessary to replace each sub-module, and it is possible to perform a failure handling process of a communication line in a short time.

[0008]

SUMMARY OF THE INVENTION A line termination protector of the present invention is provided so that a line termination connector for inputting an external line and a protection element used as an overvoltage protection element or an overcurrent protection element can be replaced. A line termination protector comprising a protective element accommodating case for accommodating one or a plurality of components, and an output side connector, wherein the protective element is electrically connected to the line termination connector and the output side connector.

And a line termination protector in which the line termination connector, the protective element housing case and the output side connector are arranged integrally with the printed wiring board, or
A line termination protector in which a protection element housing case and an output side connector are integrally disposed on a printed wiring board, and a line termination connector is connected to a connection connector provided on the printed wiring board via a cable. .

The protective element housing case is formed of a housing, a contact formed of a spring material for contacting an electrode of the protective element inside the housing, and is in electrical contact with the contact and protrudes outside at the bottom of the housing. It is a line termination protector having a lead terminal. Further, there is provided a line termination protector provided with guides for guiding the protection elements and arranging the protection elements at appropriate intervals on the inner wall of the housing of the protection element housing case for accommodating a plurality of protection elements in a replaceable manner.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a perspective view of one embodiment of the line termination protector 15 of the present invention. In the following detailed description and the description of the drawings, like elements are denoted by like reference numerals.

The line termination protector 15 includes a line termination connector 17 on a printed wiring board 16 to which a service line (not shown) of a subscriber line is connected, and a plurality of protection elements in this example. A housing 19 that forms a protective element housing case 33 in which the housing 18 is housed, and an output connector 20 that is connected to an exchange and the like are arranged. In the present invention, the line termination connector 17, the protection element housing case 33 and the output connector 20 are connected to the printed wiring board 16 as shown in FIG.
It is not limited to a configuration that is integrally disposed above. A plurality of connection terminals 21 are formed on the output side of the line termination connector 17, and are respectively connected to conductors 22 formed on the printed wiring board 16. 1 and 2, the conductor 22 is connected to the protection element 18 via one lead terminal 23 of the protection element housing case 33.

When the protection element 18 is an overvoltage protection element, the conductor 22 is further connected to the output connector 20 via another conductor 24 formed on the printed wiring board 16. The other lead terminal 25 of the protection element housing case 33 is connected to a ground terminal 26 common to the protection elements. In addition,
The protection element housing case 33 can be provided with an overcurrent protection element instead of the overvoltage protection element. In this case, the overcurrent protection elements are connected in series. That is, the conductor 22 is connected to one lead terminal 23, and an overcurrent protection element is connected between one lead terminal 23 and the other lead terminal 25, and the other lead terminal 25 is not connected to the ground terminal 26. It is connected to the output connector 20 via the conductor 24.

The housing 19 is sealed by a cap 27 to protect the protection element from an external environment during normal operation. The cap 27 has a structure that can be removed from the housing 19, and when one of the plurality of protection elements fails, the failed protection element 18 is removed at the site where the line termination protector 15 is installed, and a new protection element is provided. Replacement processing with an element is enabled.

Examples of the overvoltage protection element include, but are not limited to, an arrester having a gap piece such as mica between two carbon electrodes, and a non-linear resistance element mainly composed of ZnO. A semiconductor element such as a varistor or a thyristor having a four-layer structure of a silicon PN junction diode, a ze diode, and a PNPN having a quasi-directional characteristic exhibiting a non-linear resistance characteristic can be used. Examples of the overcurrent protection element include, but are not limited to, a side-cut fuse and a positive thermistor (PTC) having a positive resistance temperature characteristic.

FIG. 2 shows an internal structure of the protection element housing case 33 in a state where the protection element 18 is housed. The electrodes 3 of the protection element 18 housed in the protection element housing case 33 are provided on the lower inside and bottom 29 of the side wall 28 of the housing 19.
The contact 31 is arranged so as to oppose 0. Contact 3
1 is formed using a spring material such as phosphor bronze. In the present embodiment, the contact has an L-shape, has a shape that is curved toward the inside of the housing case 33 at the side wall of the housing 19, and has a flat shape at the bottom of the housing 19.

When the protection element 18 is inserted, the curved portion is pushed out toward the side wall of the housing 19, and the protection element 18 is mechanically securely fixed in the housing 19 by the elasticity of the spring material. The electrode 30 has sufficient electrical contact with the contact 31. Protective element 1 at bottom
Since the contact is made with the eight electrodes 30, the contact resistance can be reduced. When used for an overvoltage protection element,
Since a large ground current flows, it is necessary to reduce the contact resistance, and the above structure is particularly effective. A large voltage of, for example, a peak value of about 3 kV may be applied to the external line due to a lightning surge or the like.
This is because a large pulse current may flow.

The contact 31 is electrically connected to the lead terminal 23 which is an input terminal of the protective element housing case 33. The contact 31 and the lead terminal 23 can be formed by processing and forming the same member.
The housing 19 can be formed by extrusion using a plastic material, for example, a plastic material containing glass fiber.

Although not particularly limited to this shape, as shown in a perspective view of the protection element 18 in FIG.
In order to show the shape of 0, it is displayed upside down from the state of FIG. The electrode 30 has an L-shape corresponding to the contact 31. In FIG. 3, the protection element body such as a thyristor is sealed, and at least two electrodes 30 are provided.
Thus, an electrical connection is made with an external circuit.

FIG. 4 shows another embodiment of the present invention. Instead of the line termination connector 17, a connection connector 31 for connecting to the line termination connector 17 is arranged on the printed wiring board 16, and the line termination connector 17 is connected via a flexible electric cable 32. Lever connector 3
1 is connected. In FIG. 4, each independent cable 3
2 is used, it is also possible to use a cable in which a plurality of conductors are integrally formed, and if necessary, a flexible circuit board having a plurality of conductors can be used as the cable. It is possible.

As described above, by adopting a structure in which the line termination connector 17 is not fixed to the protection element 18 and the output side connector 20, the line termination connector 17 is provided.
Work efficiency can be improved.

FIG. 5 shows another structural example of the protective element housing case 33. The protective element 18 is guided to the inner wall of the housing 19, and a guide 34 for arranging the protective elements at appropriate intervals is provided. It is a thing. FIG. 5 shows a guide 34 formed by a protrusion formed in the insertion direction of the protection element 18 as an example. Since each protection element can be arranged at an appropriate interval, alignment with the contact 31 is easy,
Further, insertion and removal of the protection element 18 can be easily performed.

In the example described above, the line termination protector according to the present invention is applied to the case of a plurality of lines, but the present invention is also applied to the case of a single line as described below. Can be. FIG. 6 shows one configuration of the line termination protector according to the present invention when there is one line.

This line termination protector comprises, for example, a line termination connector 17 and a protection element accommodating case 33 for accommodating one protection element 18 on an elongated printed wiring board 16.
And the output side connector 20 are integrally arranged. The protection element 18 is covered with a cap (not shown) in the same manner as described above, and when a failure occurs, the failed protection element 18 is removed at the site where the line termination protector is installed, and replaced with a new protection element. Is possible.

One connection terminal 21 is formed on the output side of the line termination connector 17 and is connected to a conductor 22 formed on the printed wiring board 16. Although not shown, the conductor 22 is connected to the protection element 18 via one lead terminal of the protection element housing case 33 as in the case of FIG.

When the protection element 18 is an overvoltage protection element, the conductor 22 is further connected to the output connector 20 via another conductor 24 formed on the printed wiring board 16. The other lead terminal of the protection element housing case 33 is connected to a ground terminal (not shown) of the protection element 18. Note that, similarly to the case of a plurality of lines, the protection element housing case 33 can be provided with one overcurrent protection element instead of the overvoltage protection element.

When the protection element 18 is inserted, the protection element accommodating case 33 holds the protection element 18 by the elasticity of the contact 31 made of a spring material by the same configuration as that shown in FIG. The electrode 30 is securely fixed mechanically in the case, and a sufficient electrical contact of the electrode 30 to the contact 31 is obtained.

By the way, even when there is one line, the workability of the connector for the line termination should be improved. For example, as shown in FIG. 16, the line termination connector 17 is connected to the connection connector 31 provided on the printed wiring board 16 via the electric cable 32 so that the line termination connector 17 is connected to the protection element 18 and the output side. A configuration that is not fixed to the connector 20 may be adopted.

Although several embodiments of the present invention have been illustrated and described, it is apparent that various modifications can be made without departing from the technical scope of the present invention.

[0030]

As described above, according to the line termination protector according to the present invention, when one or a plurality of replaceable protection elements in the protection element housing case fail, the line can be protected. It is possible to replace a faulty protection element in the line termination protector without replacing the terminal protection unit, and to replace the protection element, a line termination protector is installed. In addition, it is easy to perform on-site, and the replacement work can be performed without the need for a particularly skilled worker, so that the trouble handling of the communication line can be performed in a short time. .

Further, by employing a structure in which the line termination connector is not fixed to the protection element and the output side connector, it is possible to improve the workability of the line termination connector.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a structural example of a line termination protector according to the present invention.

FIG. 2 is a sectional view of a housing case for housing a protection element according to the present invention.

FIG. 3 is a perspective view showing a structural example of a protection element according to the present invention.

FIG. 4 is a perspective view showing a structural example of a line termination protector separated from a printed wiring board according to the present invention.

FIG. 5 is a perspective view showing an embodiment of a storage case according to the present invention.

FIG. 6 is a plan view showing an example of a line termination protector according to the present invention when there is one line.

FIG. 7 is a plan view showing a structural example of the line termination protector separated from a printed wiring board in the line termination protector.

FIG. 8 is a perspective view showing an example of a conventional protector for a communication device.

FIG. 9 is a circuit diagram of a conventional protector for a communication device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Line termination protector sub-module 2 Line termination processing connector 3 Termination connector mounting case 4 Printed wiring board 5, 7, 9 Conductor 6 Protective element 8 Test weapon unit 10 Output connector 11 Drop-in wire 12 Inspection connection part 13 Ground terminal 14 Extension 15 Line termination protector 16 Printed wiring board 17 Line termination connector 18 Protective element 19 Housing 20 Output connector 21 Connection terminal 22, 24 Conductor 23, 25 Lead terminal 26 Earth terminal 27 Cap 28 Housing side wall 29 Housing bottom 30 Protective element electrode 31 Connector 32 Electric cable 33 Protective element housing case 34 Guide

Claims (5)

[Claims] 1. A line termination connector for inputting an external line, a protection element housing case accommodating one or more exchangeable protection elements used as overvoltage protection elements or overcurrent protection elements, and an output side. And a connector, wherein the protection element is electrically connected to the line termination connector and the output side connector. 2. The line termination protector according to claim 1, wherein the line termination connector, the protection element housing case, and the output side connector are integrally disposed on a printed wiring board. . 3. The protection element housing case and the output side connector are integrally disposed on a printed wiring board, and the line termination connector is connected to a connection connector provided on the printed wiring board via a cable. The line termination protector according to claim 1, characterized in that: 4. The protection element housing case includes: a housing; a contact formed of a spring material for contacting an electrode of the protection element inside the housing; and a housing electrically connected to the contact. The line termination protector according to any one of claims 1 to 3, further comprising: a lead terminal projecting outward at a bottom portion. 5. A guide for guiding the protection elements and arranging the protection elements at appropriate intervals is provided on an inner wall of the housing of the protection element housing case for accommodating a plurality of protection elements in a replaceable manner. The line termination protector according to any one of claims 1 to 4, wherein