JP5823907B2 - Overvoltage protection device - Google Patents

Description

  The present invention relates to an overvoltage protection circuit and an overvoltage protection device that can protect a communication device having an Ethernet port from overvoltage.

  Conventionally, in order to protect a communication apparatus having an Ethernet port from overvoltage, for example, a pulse transformer T is inserted in a signal path from the control IC 100 to the Ethernet port P as shown in FIG. When an overvoltage is applied between the Ethernet port P and the telephone port L, the control ICs 100 and 101 are protected from the overvoltage by the withstand voltage of the pulse transformer T.

“Electronic Components Square”, [online], ITMedia. Inc. [Search April 2, 2012] Internet <URL: http://ednjapan.com/content/EC/spotlight3_2.html>

  However, the withstand voltage of a general pulse transformer T is 1.5 kV or 2.5 kV, and the withstand voltage of a high-voltage pulse transformer is about 7 kV. In the ITU-T overvoltage tolerance requirement (special requirement), an overvoltage tolerance of 13 kV for lightning entering from the telephone port (between the telephone port and ground) and 10 kV against lightning entering from the power supply (between the power supply and ground). Demands.

  That is, the circuit of FIG. 5 cannot satisfy these requirements, and if the pulse transformer T breaks down, the control ICs 100 and 101 cannot be protected from overvoltage.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an overvoltage protection circuit and an overvoltage protection device that can protect a communication device having an Ethernet port from overvoltage.

  The overvoltage protection device is an overvoltage protection device for a communication device having a plurality of Ethernet ports, and each Ethernet port uses a first type connector having a first type, and the overvoltage protection device is A second type connector meshing with each first type connector; a first type connector connected to each second type connector via a signal path; and a plurality of pulse transformers inserted into the signal paths and connected in series. An overvoltage protection circuit; and a module having an insulating plate that insulates the second type connectors from each other, the overvoltage protection circuits from each other, and the first type connectors.

  The overvoltage protection device is an overvoltage protection device for a communication device having a plurality of Ethernet ports, and each Ethernet port uses a first type connector having a first type, and the overvoltage protection device is A second type connector meshing with each first type connector; a first type connector connected to each second type connector via a signal path; and a plurality of pulse transformers inserted into the signal paths and connected in series. An overvoltage protection circuit, an insulating plate for insulating the second type connectors from each other, the overvoltage protection circuits and the first type connectors, and a means for attaching and detaching the second type connectors to and from the Ethernet ports in a lump. A module having a jig is provided.

  According to the present invention, since a plurality of pulse transformers are connected in series, a communication device having an Ethernet port can be protected from overvoltage.

1 is a partial circuit diagram of a communication device including an overvoltage protection circuit according to a first embodiment. It is a figure which shows the utilization form of the overvoltage protection apparatus which concerns on 2nd Embodiment. It is a perspective view which shows the jig | tool 14 used by 2nd Embodiment. It is a figure which shows the mode of the dielectric breakdown when not using the insulating plate 12 used by 2nd Embodiment. It is a circuit diagram for demonstrating the conventional overvoltage protection.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]
FIG. 1 is a partial circuit diagram of a communication device including an overvoltage protection circuit according to the first embodiment.

  The overvoltage protection circuit 10 includes a plurality of (for example, two) pulse transformers T inserted in a signal path reaching each Ethernet port P of a communication apparatus having a plurality of Ethernet ports P and connected in series. For example, the withstand voltage of each pulse transformer T is 7 kV. The primary side capacitance of each pulse transformer T is also the same. The secondary side capacitance of each pulse transformer T is also the same.

  A jack-type connector is used for the Ethernet port P, and is engaged with a plug-type connector PL provided at the end of the Ethernet cable.

  A signal path connecting the Ethernet port P and the pulse transformer T, a signal path connecting the pulse transformers T, and a signal path connecting the pulse transformer T and the control IC 100 to be protected are each configured by a plurality of pattern wirings.

  The communication device has a telephone port L, for example. A jack-type connector is used for the telephone port L, and meshes with a plug-type connector LL provided at the end of the modular cable.

  The signal path connecting the telephone port L and the control IC 101 to be protected is composed of, for example, two pattern wirings.

  For example, the control ICs 100 and 101 are connected by a bus 200 including a power supply line and a control line.

  For example, an overvoltage of 13 kV is applied between a certain Ethernet port P and telephone port L. Since the withstand voltage of each pulse transformer T is 7 kV, the withstand voltage of two pulse transformers T connected in series is 14 kV. Therefore, dielectric breakdown does not occur, and the control ICs 100 and 101 can be protected from overvoltage. Further, if the number of pulse transformers T connected in series is increased, the withstand voltage can be further increased.

  In the first embodiment, the communication device having a plurality of Ethernet ports P is taken as an example, and the overvoltage protection circuit 10 is provided for each Ethernet port P. However, the Ethernet port of the communication device having a single Ethernet port P is provided. The overvoltage protection circuit 10 may be provided in any one Ethernet port P of P or a communication device having a plurality of Ethernet ports P.

[Second Embodiment]
Next, a second embodiment of the present invention will be described. In the second embodiment, the same or similar circuit is used in the first embodiment, the same or similar circuits are denoted by the same reference numerals used in the first embodiment, and the duplicate description is omitted. The description will focus on matters different from those of the first embodiment.

  FIG. 2 is a view showing a usage form of the overvoltage protection device according to the second embodiment, and FIG. 3 is a perspective view showing a jig 14 used in the second embodiment.

  The overvoltage protection device 10 </ b> A is an overvoltage protection device for the communication device 1 having a plurality of Ethernet ports P. Each Ethernet port P uses a jack-type connector (first type connector).

  The overvoltage protection device 10A includes a plug-type connector PL1 (second type connector) that meshes with each Ethernet port P, that is, a jack-type connector, and the same jack-type as the Ethernet port P that is connected to each connector PL1 via a signal path. Connector P1 (first type connector), overvoltage protection circuit 10 having a plurality (for example, two) of pulse transformers T inserted in each signal path and connected in series, connectors PL1 and overvoltage protection circuits 10 and connector P1 An insulating plate 12 that insulates each other, a substrate 13 for mounting these components, and a module 15 having a jig 14 for attaching and detaching the connector PL1 to and from each Ethernet port P at once are provided.

  The signal path connecting the connector PL1 and the pulse transformer T, the signal path connecting the pulse transformers T, and the signal path connecting the pulse transformer T and the connector P1 are each configured by a plurality of pattern wirings.

  The connector P1 engages with the same plug type connector PL as the connector PL1 provided at the end of the Ethernet cable.

  As shown in FIG. 3, the jig 14 is, for example, a rod-shaped jig attached to the lever V provided in each connector PL1, and when the jig 14 is pushed in the direction of the arrow, the connector PL1 and the Ethernet port When P is not engaged and the jig 14 is released, the connector PL1 and the Ethernet port P are engaged. Therefore, each connector PL1 can be attached to each Ethernet port P in a lump by inserting the connector PL1 into the Ethernet port P while pushing the jig 14 and releasing the jig 14. Further, by pushing the jig 14 and pulling out the connector PL1 from the Ethernet port P as it is, the connectors PL1 can be disconnected from the Ethernet ports P at once.

  Further, in the second embodiment, by providing the insulating plate 12, it is possible to prevent dielectric breakdown at locations other than the pulse transformer T.

  As shown in FIG. 4, if the insulating plate 12 is not provided, for example, there is a possibility that dielectric breakdown may occur between the pattern wirings of the adjacent connectors P1.

  However, since the so-called creepage distance can be increased by providing the insulating plate 12 in the second embodiment, such dielectric breakdown can be prevented and the communication device 1 can be more reliably protected from overvoltage. .

  In the second embodiment, each insulating plate 12 and jig 14 are provided. However, even if only one of them is provided, the above-described effects can be obtained.

  Further, by providing each insulating plate 12 and jig 14, that is, by providing such an external module 15, it is not necessary to provide the pulse transformer T inside the communication device 1, and convenience can be improved.

DESCRIPTION OF SYMBOLS 1 Communication apparatus 10 Overvoltage protection circuit 10A Overvoltage protection apparatus 12 Insulation board 13 Substrate 14 Jig 15 Module P Ethernet port P1, PL, PL1, LL Connector L Telephone port T Pulse transformer V Lever

Claims (2)

An overvoltage protection device for a communication device having a plurality of Ethernet ports,
Each Ethernet port uses a first type connector having a first type,
The overvoltage protection device is:
A second type connector meshing with each first type connector; a first type connector connected to each second type connector via a signal path; and a plurality of pulse transformers inserted into the respective signal paths and connected in series. An overvoltage protection circuit comprising: an overvoltage protection circuit having an insulating plate that insulates the second type connectors from each other, the overvoltage protection circuits from each other, and the first type connectors. An overvoltage protection device for a communication device having a plurality of Ethernet ports,
Each Ethernet port uses a first type connector having a first type,
The overvoltage protection device is:
A second type connector meshing with each first type connector; a first type connector connected to each second type connector via a signal path; and a plurality of pulse transformers inserted into the respective signal paths and connected in series. An overvoltage protection circuit having the second type connectors, an insulating plate that insulates the overvoltage protection circuits from each other and the first type connectors, and the second type connectors are attached to and detached from the Ethernet ports in a lump. An overvoltage protection device comprising a module having a jig.

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