JPH11154579A - Connector type arrester - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connector type arrester having a fuse function to protect a device at trouble time of an arrester element and easily installed on a signal conductor. SOLUTION: A coaxial connector is constituted by having concentric central contacts 13 and 16 and external contacts 11 and 15 on both sides to be joined to a mating coaxial connector on both sides. An arrester element 1 and a base board 9 by laminating a reference electric potential conductor 21 to connect its one terminal 1a to both side external contacts 11 and 15 and a fuse conductor 30 which connects both side central contacts 13 and 16 to each other and is connected to the other terminal 1b of the arrester element 1 and functions as a fuse to be fused when an electric current exceeding a maximum allowable current of the arrester element 1 flows, are housed in a cavity part between the central contacts 13 and 16. The terminals 1a and 1b are connected to an axial directional intermediate position of the reference electric potential conductor 21 and the fuse conductor 30, and the reference electric potential conductor 21 and the fuse conductor 30 are formed in line symmetry to their connecting position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connector-type arrester having a built-in arrestor element that conducts when a surge voltage exceeding a predetermined voltage value is applied to a coaxial connector having a coupling portion with a coaxial connector on the opposite side. It is.

[0002]

2. Description of the Related Art An overvoltage protection circuit using an arrester element that conducts at a predetermined applied voltage to prevent an abnormal voltage from being generated on a signal line of an electronic device or a communication device due to a lightning strike and destroying the device is well known. is there. Further, JP-A-61-24
According to Japanese Patent No. 7225, as a countermeasure against a short circuit failure of an arrester element against a surge exceeding a withstand capacity, a series circuit of an arrester element and a fuse with an alarm indicator is connected in parallel in a plurality of stages to cope with a plurality of short circuit failures. A possible overvoltage protection circuit has also been proposed. This makes it possible to protect the device against the next lightning strike against a failure of the arrester element.

[0003]

In addition to the function of protecting the device in the event of a failure of the arrester element, it is desired that the overvoltage protection circuit can be arbitrarily mounted in a simple manner according to the installation environment of the device. There is also a request to say.

In view of the foregoing, the present invention has a fuse function for protecting a device when an arrester element fails,
It is another object of the present invention to provide a connector type arrester which can be easily attached to a signal line.

[0005]

In order to achieve this object, according to the present invention, a central contact and an external contact are concentrically provided on both sides for coupling with a mating coaxial connector on both sides. A connector type arrester housing a coaxial connector provided with an arrester element that conducts when a surge voltage exceeding a predetermined voltage value is applied, wherein an arrester element and one terminal of the arrestor element are placed in a cavity between center contacts on both sides. It functions as a fuse that connects between the reference potential conductor connected to the external contacts on both sides and the center contact on both sides, and also connects to the other terminal of the arrester element, and blows when a current exceeding the maximum allowable current of the arrester element flows. And the other terminal of the arrester element is connected to the reference potential conductor and the fuse. While connected to the shaft direction of the intermediate position of use conductor, reference potential conductor and the fuse conductor to these connection locations, characterized in that it is formed in line symmetry shape.

[0006] The signal of the signal line is transmitted through a circuit composed of a reference potential conductor and a fuse conductor to which the terminals of the arrester element are connected in a state of being connected to the coaxial connector of the other party on both sides. When a surge voltage enters the signal line, the arrester element conducts, thereby preventing overvoltage or overcurrent from entering the device connected through the coaxial connector of the other party. In the state where the conduction function of the arrester element has failed and its bypass function has been impaired, if a current that exceeds the maximum allowable current of the arrester element and blows the fuse conductor during the next lightning strike enters, the melting will occur. The device is protected.

In order to suppress the deterioration of the high-frequency characteristics due to the interposition of the arrester element, a double-sided board is housed in the high-frequency coaxial connector and is opposite to the board side to which the terminals of the arrester element are connected. A stub for impedance matching is formed by the conductor on the substrate side. In order to set the assurance level more safely, according to claim 3, instead of exceeding the maximum permissible current of the arrester element, the fuse conductor is blown when a current equal to or smaller than the maximum permissible current flows. Formed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A connector type arrester according to an embodiment of the present invention will be described with reference to FIGS. FIG.
2, the connector type arrester includes a pin-shaped center contact 13 and a ring-shaped external contact 11 formed integrally with the shell 10 so as to function as a plug on one side, and concentrically on the other side. A center contact 16 having a plurality of slits 16a and a ring-shaped external contact 15 are provided concentrically so as to function as a jack. A coupling 14 locked by a spring ring 14b is attached to one end of the shell 10, and can be coupled to a mating jack-type coaxial connector. The other end is provided with a thread 10a so that it can be connected to a mating plug-type coaxial connector.

The center contacts 13 and 16 are held by the center holes of the ring-shaped insulator 12, and the cavity 10b between the center contacts 13 and 16 on both sides has terminal lead wires 1a and 1b at both ends. For example, a gas discharge type arrester element 1 and a double-sided glass epoxy, ceramic, Teflon or the like substrate 9 on which a conductor supporting the arrester element and having a fuse function and an impedance matching function with respect to the interposition of the arrester element 1 are laminated. And are stored.

As shown in FIG. 3, the substrate 9 has an opening 29a into which the arrester element 1 is inserted, and has a reference potential conductor 21 on both sides along the axial direction on one surface thereof.
Twenty-three patterns are layered. An enlarged portion 22 for soldering one lead wire 1 a of the arrester element 1 is formed at an intermediate position in the axial direction of the conductor 21. Further, a fuse conductor 30 formed by a base conductor 31 at both ends in the axial direction connected to the two center contacts 13 and 16 and a signal path conductor 32 connecting these base conductors to each other is laminated. An enlarged portion 33 for soldering the other lead wire 1b of the arrester element 1 is formed at the intermediate position.

As shown in FIG. 4, on the other surface of the substrate 9, conductors 21a and 23a for reference potential, which are electrically connected to the conductor 21 and the conductor 23 at the corner through through holes, respectively.
Pattern is stratified. Further, strip-shaped impedance matching conductors 35 projecting in parallel in the axial direction from both ends of the base conductors 31a on both sides which are electrically connected to the base conductor 31 through the through holes and terminating so as to be separated from each other at intermediate positions. Is stratified.

In the hollow portion 10b, a conductive bushing 18 having ring-shaped flange portions 18a on both sides in the axial direction and supporting the substrate 9 is accommodated so that the insulator 12 is inserted on both sides and abuts against the end surface thereof. ing. An opening 29 into which the arrester element 1 is partially inserted is formed on the peripheral surface of the bushing.
a is formed, and the peripheral surface is formed so as to contact the inner peripheral surface of the shell 10 and the end surfaces of the external contacts 11 and 15. The base conductor 31 of the substrate 9 is
The conductors 21, 21a, 23, and 23a are soldered to the protruding portions 13a and 16b at the base end portions of the bushings 3 and 16.
8 is soldered.

The position and shape of the impedance matching conductor 35, the separation distance between the separated portions 37, and the like are combined with the impedance exhibited by the remaining conductor portions on the front and back sides to ensure an impedance matching of a wide band up to about 2 GHz as an open stub. It is set to be. The material and the shape of the signal path conductor 32 are set so that the operating voltage is, for example, 10 kA, which slightly exceeds the maximum allowable current of the arrester element 1 of about 100 V, for example. In addition, all the conductors are formed in a line-symmetrical shape on both sides in the axial direction with respect to the enlarged portions 22 and 33 so that the fusing characteristics are the same when current flows in from either side.

The components described above are mounted on the insulator 12 by attaching the center contacts 13 and 16 to the bushing 18, and after coupling the board 9 and the arrester element 1 to the shell 10, the coupling to the shell 10 is performed. It is mounted in the axial direction from the opening opposite to 14 and assembled.

A connector type arrestor configured as such an N-type connector can be connected to an arbitrary position of a communication cable connected to a transmission or a receiver from an antenna, for example, and is connected to a jack-type connector at an intermediate position. On the other side, a coupling of a plug-type connector is connected to the thread 10a. Thereby, as shown in FIG. 5, the communication line 8 of the device 5 to be protected
The arrester element 1 is connected in parallel between the center conductor 6 and the shield conductor 7 of the jacket, and a protection circuit having fuses F1 formed by half of the signal path conductor 32 on both sides of the arrester element 1 is formed.

When a surge voltage enters the communication line 8 due to a lightning strike, the arrester element 1 conducts, thereby preventing surge voltage or surge current from entering the device 5. When the resistance becomes high due to abnormal conduction characteristics of the arrester element 1,
When a surge current exceeding 10 kA rushes in at the next lightning strike, the signal path conductor 32 is blown and the device 5 is protected. Even when the connector type arrester is inverted and coupled to the communication line due to its symmetric structure, the same operation can be obtained.

The signal path conductor 32 may be blown earlier than a failure of the arrester element 1 by setting the maximum allowable current of the arrester element 1 to be equal to or smaller than that of the arrester element 1. The device 5 can be reliably protected against deterioration of the conduction characteristics of the device 5. In this case, even if the half of the signal path conductor 32 on the device 5 side is blown first, the half of the conductor on the antenna side is blown immediately after the current rush into the arrester element 1.

Further, as described above, it is conceivable to connect one of the connector type arresters not to the middle of the communication line but to a connector seat provided on the device, and to interpose the communication line between various devices. it can. The coupling portions on both sides are not limited to the plug and jack type, and only one of them or another coupling method can be considered.

[0019]

According to the first aspect of the present invention, since the arrester is configured as a connector, it can be easily attached to the connector at the middle or end of the signal line from the antenna or the signal line between the devices. Become. It is also easy to attach to the installed device when necessary. Exchange is easy. Further, since the fuse is formed of a conductor of a built-in substrate, the internal structure is simplified in addition to the compact external structure of the connector type. Even if the conduction characteristics of the arrester element become poor, it is possible to reliably protect against a subsequent lightning strike due to fusing of the fuse conductor. There is no fusing direction due to the symmetrical structure. Claim 2
According to the invention, a high-frequency connector type arrester capable of suppressing deterioration of high-frequency transmission characteristics due to insertion of an arrester element is realized. According to the third aspect of the present invention, irrespective of the failure of the arrester element, surge voltage or current rush into the device is reliably protected without increasing the protection level with respect to the arrester element. It is also possible to avoid the deterioration of the protection function due to the secular change.

[Brief description of the drawings]

FIG. 1 is a partially broken side view of a connector type arrester according to an embodiment of the present invention.

FIG. 2 is a partially broken side view of the connector type arrester, which is rotated by 90 °.

FIG. 3 is a plan view of a board housed in the connector type arrester.

FIG. 4 is a bottom view of the substrate.

FIG. 5 is a diagram illustrating an overvoltage protection circuit formed by the connector type arrester.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Arrester element 9 Substrate 11, 15 External contact 13, 16 Center contact 21, 21a, 23, 23a Reference potential conductor 30 Fuse conductor

Claims (3)

[Claims] 1. An arrestor element which conducts when a surge voltage exceeding a predetermined voltage value is applied to a coaxial connector provided with a center contact and an external contact concentrically on both sides for coupling with a coaxial connector of the other side on both sides. A connector-type arrester containing the arrestor element, a reference potential conductor for connecting one terminal of the arrestor element to the external contact on both sides, and the center contact on both sides. And a substrate on which a fuse conductor that functions as a fuse that blows when a current exceeding the maximum allowable current of the arrester element flows is connected to the other terminal of the arrester element. One and the other terminals of the arrester element are in contact with the axially intermediate positions of the reference potential conductor and the fuse conductor. While, connector type arrester, characterized in that said reference potential conductor and the fuse conductor to these connection locations are formed in line symmetry shape. 2. A double-sided board is housed in a high-frequency coaxial connector, and an impedance matching stub is formed by a conductor on the board side opposite to the board side to which terminals of the arrester element are connected. The connector type arrester according to claim 1, wherein 3. The connector type arrester according to claim 1, wherein the fuse conductor is blown when a current equal to or smaller than the maximum allowable current flows instead of exceeding the maximum allowable current of the arrester element. .