Surge protection devices for communication lines

Abstract

To provide a surge protection device that does not require a ground wire or a power wire and can be installed on a PoE-compatible communication cable. [Solution] A surge protection device 10 is provided on a PoE-compatible communication line 5 that connects a transmitting device 2 and a power receiving device 3 and is capable of transmitting and receiving data signals and supplying power. The surge protection device 10 includes a splitter 11 that is connected to the PoE-compatible communication line 5 and separates the data signal and power output to the communication line 5, a signal line 15 that is connected to the splitter 11 and transmits the data signal separated by the splitter 11, a power supply line 16 that is connected to the splitter 11 and transmits the power separated by the splitter 11, an injector 12 that is connected to the signal line 15 and the power supply line 16 and outputs the data signal and power to the PoE-compatible communication line 5, a first surge protection element 13 that is provided on the signal line 15, and a second surge protection element 14 that is provided on the power supply line 16.

Description

[Technical field]

[0001] The present invention relates to a surge protection device, and more particularly to a surge protection device provided on a PoE-compatible communication line. [Background technology]

[0002] Devices such as network cameras operate by connecting to transmitting devices such as switching hubs via communication cables (communication lines) such as LAN cables. When using network cameras for security and surveillance purposes, they are often installed on ceilings or outdoors, but generally there is no power source installed on the ceiling or outdoors. For this reason, a power supply cable must be installed in addition to the communication cable, and securing a power source has been an issue.

[0003] In recent years, a method called PoE (Power over Ethernet (registered trademark)) has been developed to supply power along with data signals through communication cables. The use of PoE technology eliminates the need to lay power supply cables, making it easier to install network cameras in places where it is difficult to secure a power source.

[0004] Communication cables were originally used to connect electronic devices in networks installed indoors, and because they were little affected by abnormal voltages (surge voltages) from lightning or power lines, there was no great need for protective measures. However, as mentioned above, the number of cases in which electronic devices for indoor networks are now being installed outdoors has increased, and this has created a need for surge protection measures for communication cables.

[0005] One of the surge protection measures is to insert an SPD (lightning arrester, protective device) in a communication cable (for example, Patent Document 1). Known types of SPDs are discharge type SPDs and isolated type SPDs. Discharge type SPDs use discharge type surge protection elements such as lightning arresters and varistors to reduce circuit impedance against abnormal voltages and provide protection by suppressing abnormal voltages applied to the equipment to be protected. Isolated type SPDs use isolated type surge protection elements to protect the equipment to be protected by insulating the circuit against abnormal voltages.

[0006] However, because PoE supplies DC power, a PoE-compatible communication cable (hereinafter also referred to as a "PoE cable") that supplies data signals and power to electronic devices cannot be equipped with an isolated SPD, but rather with a discharge SPD. However, because a discharge SPD requires a grounding wire, a separate grounding wire must be provided for the discharge SPD, which requires securing installation space and incurs costs for materials and construction.

[0007] Although an insulated SPD does not require a ground wire, as described above, it cannot be provided in a PoE cable and is used in a communication cable (hereinafter, also referred to as a "signal line" or "signal cable") that communicates only data signals. When an insulated SPD is provided in a power receiving device such as a PoE-compatible network camera or an IP phone, for example, a system 100 as shown in FIG. 6 is configured. A switching hub 102 connected to a power source 101 is connected to an injector 103 by a signal cable 104. Insulated SPDs 105 are provided at two positions on the signal cable 104, one close to the switching hub 102 and the other close to the injector 103. The injector 103 is also connected to a power source 107 by a power supply cable 106. A lightning-resistant transformer 108 is connected to the power supply cable 106 at two positions, one close to the power source 107 and the other close to the injector 103. A PoE-compatible network camera 109 is connected to the injector 103 by a PoE cable 110. A signal cable 104 and a power supply cable 106 are connected to the injector 103 .

[0008] A data signal from the switching hub 102 is transmitted to the injector 103 via a signal cable 104. Power is supplied to the injector 103 via a power supply cable 106. The injector 103 combines the data signal from the signal cable 104 and the power from the power supply cable 106 into a PoE-compatible output, and supplies the output to the network camera 109 via a PoE cable 110. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Special Publication No. 2015-529431 Summary of the Invention [Problem to be solved by the invention]

[0010] 6 uses an isolated SPD 105 and does not require a ground wire, but it is necessary to connect a power supply cable 106 to the injector 103. In addition, a surge protection device such as a lightning-resistant transformer 108 is required for the power supply cable 106, which complicates the configuration. Originally, the use of PoE had the advantage of eliminating the need for the power supply cable 106 and reducing the number of cables, but the number of cables cannot be reduced in the system 100 of FIG. 6.

[0011] The present invention has been made in consideration of the above problems, and has an object to provide a surge protection device that can be installed on a PoE-compatible communication cable and does not require a ground wire or a power wire. [Means for solving the problem]

[0012] In order to achieve the above object, the present invention includes the subject matter described in the following paragraphs.

[0013] Item 1: A surge protection device that is installed on a PoE-compatible communication line that connects a transmitting device and a receiving device and is capable of transmitting and receiving data signals and supplying power, a splitter connected to the communication line for separating a data signal and power transmitted to the communication line by the transmitting device; a signal line connected to the splitter and transmitting the data signal separated by the splitter; a power supply line connected to the splitter and transmitting the power separated by the splitter; an injector connected to the signal line and the power supply line, for outputting the received data signal and the power to the communication line; a first surge protection element provided on the signal line; a second surge protection element provided on the power supply line.

[0014] Item 2: A substrate on which the splitter, the signal line, the power supply line, the injector, the first surge protection element, and the second surge protection element are provided; Item 2. The surge protection device of item 1, further comprising: a housing that accommodates the substrate.

[0015] Item 3: A first port connected to the splitter and receiving a data signal and power from a PoE-compatible communication line; Item 3. The surge protection device according to item 2, further comprising: a second port connected to the injector and configured to output a data signal and power to a PoE-compatible communication line.

[0016] Item 4: The substrate, in a plan view, The patterned region is divided into a patterned region where a pattern is formed and a pattern-free region where no pattern is formed, 4. The surge protection device according to item 2 or 3, wherein the first surge protection element is provided across an area without a pattern.

[0017] Item 5: The surge protection device according to item 4, wherein a slit is provided in the area where the pattern does not overlap with the first surge protection element.

[0018] Item 6: The substrate is rectangular; The surge protection device according to any one of items 2 to 5, wherein the first surge protection element is provided on one side along a long side of a rectangle, and the second surge protection element is provided on the other side along the long side of a rectangle. Effect of the Invention

[0019] According to the present invention, it is possible to provide a surge protection device that does not require a ground wire or a power wire and can be installed on a PoE-compatible communication cable. [Brief description of the drawings]

[0020] [Figure 1] 1 is a block diagram showing a schematic configuration of a system provided with a surge protection device according to an embodiment of the present invention; [Diagram 2] 1 is a block diagram showing a schematic configuration of a surge protection device; [Diagram 3] FIG. [Figure 4] FIG. 2 is a plan view of a substrate on which components are mounted. [Diagram 5] FIG. [Figure 6] FIG. 1 is an explanatory diagram showing a conventional technique. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] An embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a block diagram of a system 1 in which a surge protection device 10 of the present embodiment is provided, and Fig. 2 is a block diagram for explaining the configuration of the surge protection device 10 of the present embodiment.

[0022] (Configuration of system 1 equipped with surge protection device 10) The system 1 includes a transmitting device 2 (also referred to as a "power supplying device" or "PSE") connected to a power source 4, a power receiving device 3, a PoE-compatible communication line 5 (hereinafter also referred to as a "communication cable 5") connecting the transmitting device 2 and the power receiving device 3, and a surge protection device 10 provided midway along the communication cable 5.

[0023] The transmitting device 2 outputs a data signal and power to the communication cable 5. In the following description, the signal output by the transmitting device 2, i.e., a signal in which power is superimposed on a data signal, is also referred to as a PoE signal. The transmitting device 2 may be, for example, a PoE-compatible switching hub, a power supply adapter, or a PoE injector, but may be any electronic device as long as it is PoE-compatible and can output a data signal and power to the communication cable 5. PoE (Power over Ethernet (registered trademark)) is a technology that enables the transmitting device 2 to transmit and receive data signals and supply power to the power receiving device 3 through a standard cable that complies with the Ethernet (registered trademark) standard. Various PoE standards, such as IEEE802.3af, 802.3at, and 802.3bt, have been established according to the amount of power supplied to the power receiving device 3.

[0024] The PoE-compatible communication cable 5 is an Ethernet (registered trademark) cable, such as a LAN (Local Area Network) cable. The communication cable 5 transmits a PoE signal that is a combination of a data signal and power, but can also transmit only a data signal or only power.

[0025] The power receiving device 3 may be, for example, an Internet camera, a wireless LAN (Local Area Network) AP (Access Point), an IP phone, a microphone, etc., but it may be any electronic device that is PoE-compatible and can receive data signals and power from the communication cable 5.

[0026] For example, when the transmitting device 2 is a switching hub and the receiving device 3 is a PoE-compatible Internet camera, the switching hub is often installed indoors and the Internet camera is often installed outdoors. In this case, the length of the communication cable 5 becomes longer, from several meters to several tens of meters, compared to when electronic devices are connected indoors. In such a case, as shown in FIG. 1, surge protection devices 10A and 10B (referred to as "surge protection device 10" when there is no need to distinguish between them) are provided at two positions on the communication cable 5, one close to the switching hub and the other close to the Internet camera. More surge protection devices 10 may be provided on the communication cable 5. If the communication cable 5 is short, the surge protection device 10 may be provided at only one position on the communication cable 5.

[0027] (Configuration of surge protection device 10) 2 shows the configuration of the surge protection device 10. The surge protection device 10 includes a splitter 11, an injector 12, a signal line 15, a power supply line 16, an isolated SPD 13 (a first surge protection element), and an isolated DC / DC converter 14 (a second surge protection element).

[0028] Splitter 11 is also called a "PoE splitter" and is connected to the PoE-compatible communication cable 5 on the transmitting device 2 side, as well as to a signal line 15 and a power supply line 16, and receives a signal (PoE signal) output to the communication cable 5 by transmitting device 2 and separates it into a data signal and power. Splitter 11 may be of any type as long as it can separate the PoE signal received via the communication cable 5 into a data signal and power.

[0029] Signal line 15 connects splitter 11 and injector 12, and transmits the data signal separated by splitter 11 to injector 12. A LAN cable of the same standard as PoE-compatible communication cable 5 may be used as signal line 15, or any cable of a standard capable of transmitting a data signal may be used.

[0030] The power supply line 16 connects the splitter 11 and the injector 12, and transmits the power separated by the splitter 11. A LAN cable of the same standard as the PoE-compatible communication cable 5 may be used as the power supply line 16, and any cable of a standard capable of transmitting power may be used.

[0031] Injector 12 is also called a "PoE injector" and is connected to signal line 15 and power supply line 16, as well as to a PoE-compatible communication cable 5 on the power receiving device 3 side, and combines a data signal transmitted from signal line 15 and power supplied from power supply line 16 into one PoE signal and outputs it to communication cable 5. Any injector 12 may be used as long as it can combine a data signal and power and output it as a PoE signal. Injector 12 is driven by power supplied from power supply line 16.

[0032] The first surge protection element is provided on the signal line 15. In this embodiment, an insulated SPD 13 (Surge Protective Device) is used as the first surge protection element. The insulated SPD 13 includes an insulated surge protection element and insulates a circuit against abnormal voltage to protect the transmitting device 2 and the power receiving device 3 that are to be protected. For example, the insulated SPD 13 is model number OLA-PT1000 manufactured by Otowa Electric Co., Ltd. The first surge protection element is not limited to the insulated SPD 13, and may be any element or device that has a function of protecting the transmitting device 2 and the power receiving device 3 that are to be protected on the signal line 15, and may be, for example, a photocoupler or an insulated pulse transformer.

[0033] The second surge protection element is provided on the power supply line 16. In this embodiment, an isolated DC / DC converter 14 is used as the second surge protection element. The isolated DC / DC converter 14 includes a transformer, and electrically insulates the input side from the output side of the power supply line 16 through which a direct current flows. The second surge protection element is not limited to the isolated DC / DC converter 14, and may be any element or device having a function of protecting the transmitting device 2 and the power receiving device 3, which are the objects to be protected, on the power supply line 16. For example, a module having a DC / DC converter function using an insulating transformer or an induction coil may be used.

[0034] (operation) In the system 1 shown in FIG. 1, a PoE signal including a data signal and power output from a transmitting device 2 is output to a communication cable 5. A surge protection device 10A receives the PoE signal output from the transmitting device 2 via the communication cable 5. A splitter 11 separates the PoE signal into a signal and power, outputs the data signal to a signal line 15, and outputs the power to a power supply line 16. The signal line 15 transmits the data signal, and the power supply line 16 transmits the power. An injector 12 receives the data signal and power via the signal line 15 and the power supply line 16, and outputs the data signal and power as one PoE signal to the communication cable 5 on the power receiving device 3 side.

[0035] The second surge protection device 10B receives the PoE signal from the communication cable 5 and operates in the same manner as the surge protection device 10A. The surge protection device 10B outputs the PoE signal to the communication cable 5, and the power receiving device 3 receives the PoE signal, i.e., the data signal and power.

[0036] Because a first surge protection element is provided on signal line 15 of surge protection device 10, even if an overvoltage (surge voltage) due to lightning occurs in communication cable 5, the overvoltage is suppressed by an insulating effect, thereby protecting transmitting device 2 and power receiving device 3. Furthermore, because a second surge protection element is provided on power supply line 16 of surge protection device 10, even if an overvoltage due to lightning occurs in communication cable 5, the overvoltage is suppressed by an insulating effect, thereby protecting transmitting device 2 and power receiving device 3.

[0037] In the conventional technology, a ground wire is required when attaching a discharge type SPD to a PoE-compatible communication cable 5, and an injector 12 is required when using an insulated type SPD 13 that does not require a ground wire, and a power line for the injector 12 is required. However, according to the surge protection device 10 of the present embodiment, surge protection for the transmitting device 2 and the power receiving device 3 is possible simply by attaching the surge protection device 10 to the PoE-compatible communication cable 5. In this way, since there is no need to newly add a power line or a ground line, wiring work is not required. Wiring work requires techniques depending on the wiring location and the lengths of the power line and the ground line, and construction costs are high. However, by providing the surge protection device 10 of the present embodiment, wiring work is not required, and construction costs can be reduced.

[0038] (Other embodiments) (Overall configuration of surge protection device 10) 3 to 5 show another embodiment of the surge protection device 10. The surge protection device 10 of this embodiment includes a substrate 20 and a housing 40 in which the substrate 20 is accommodated. A splitter circuit (also referred to as "splitter 11"), a signal line 15, a power supply line 16, an injector circuit (also referred to as "injector 12"), an isolated SPD 13 (first surge protection element), and an isolated DC / DC converter 14 (second surge protection element) are provided as components on the substrate 20. The splitter 11, the signal line 15, the power supply line 16, the injector 12, the isolated SPD 13, and the isolated DC / DC converter 14 have the same functions and configurations as those of the embodiment shown in FIGS. 1 and 2 unless otherwise specified, and therefore detailed description thereof will be omitted.

[0039] (Substrate 20) FIG. 3 is a plan view of the substrate 20. In FIG. 3, components provided on the substrate 20 are not shown. In a plan view, the substrate 20 has first to fourth no-pattern regions 21A to 21D in which no pattern is provided, which are provided in a substantially cross shape, and the first to fourth no-pattern regions 21A to 21D define first to fourth pattern regions 22A to 22D in which patterns are provided. The first to fourth no-pattern regions 21A to 21D are provided to improve the dielectric strength between the first to fourth pattern regions 22A to 22D. The patterns are conductors printed on the substrate 20 to connect the components arranged on the substrate 20.

[0040] 3 and 4, the direction in which the long sides of the rectangular substrate 20 extend is referred to as the first direction or horizontal direction, and the direction in which the short sides of the rectangle extend is referred to as the second direction or vertical direction. Moreover, one side in the vertical direction is referred to as the upper side, the side opposite to the one side in the vertical direction is referred to as the lower side, one side in the horizontal direction is referred to as the left side, and the side opposite to the one side in the horizontal direction is referred to as the right side.

[0041] In one example, the substrate 20 is set to have a vertical length of 114 mm, a horizontal length of 166 mm, and a thickness of 1.6 mm.

[0042] In this embodiment, the first pattern-free region 21A is rectangular in plan view and extends from the left edge 20c of the substrate 20 in the horizontal direction. The second pattern-free region 21B is provided continuously with the first pattern-free region 21A and extends to the right edge 20d of the substrate 20 in the horizontal direction. The second pattern-free region 21B is L-shaped, with one side of the L extending in the horizontal direction and the other side extending in the vertical direction. The widths of the first pattern-free region 21A and the second pattern-free region 21B are desirably as large as possible from the viewpoint of insulation, and are determined in consideration of the area occupied by the components provided on the substrate 20. In this embodiment, the widths of the first and second pattern-free regions 21A and 21B are set to 8.0 mm.

[0043] The first pattern-free region 21A and the second pattern-free region 21B are provided with slits 23A to 23C. The slits 23A to 23C are holes penetrating the substrate 20 in the thickness direction. In this embodiment, three slits 23A to 23C are provided. The first pattern-free region 21A is provided with a linear slit 23A extending in the lateral direction and an L-shaped slit 23B. The second pattern-free region 21B is provided with an L-shaped slit 23C corresponding to the shape of the second pattern-free region 21B. From the viewpoint of insulation, it is desirable that the areas of the slits 23A to 23C are large in the first pattern-free region 21A and the second pattern-free region 21B. However, if there are too many slits 23A-23C or if the length or width of the slits 23A-23C is too large and the total area of ​​the slits 23A-23C becomes large, the strength of the substrate 20 weakens and the substrate 20 may crack when the substrate 20 is screwed to the housing 40, so the number, length and width are set to appropriate values. In this embodiment, the width of the slits 23A-23C is set to 1 mm, the length of the straight portion of the slits 23A-23C is set to 50 mm or less, and the length between adjacent slits 23A-23C is set to 1 mm or more.

[0044] The third pattern-free region 21C is rectangular and extends between the first pattern-free region 21A and the upper edge 20a of the substrate 20. The fourth pattern-free region 21D is rectangular and extends between the first pattern-free region 21A and the lower edge 20b of the substrate 20. In this embodiment, no slits are provided in the third pattern-free region 21C and the fourth pattern-free region 21D from the viewpoint of the strength of the substrate 20, but slits may be provided therein.

[0045] The shape of the substrate 20 is not limited to a rectangular shape and may be any shape. The number, length, width and arrangement of the first to fourth pattern-free regions 21A to 21D and the number, length, width and arrangement of the slits 23A to 23C are not limited to the present embodiment and may be appropriately determined depending on the size of the substrate 20 and the area required for mounting components on the substrate 20.

[0046] The first pattern region 22A is a region surrounded by the first no-pattern region 21A, the third no-pattern region 21C, the upper edge 20a, and the left edge 20c of the substrate 20. The second pattern region 22B is a region surrounded by the first no-pattern region 21A, the second no-pattern region 21B, the third no-pattern region 21C, the upper edge 20a, and the right edge 20d of the substrate 20. The third pattern region 22C is a region surrounded by the first no-pattern region 21A, the second no-pattern region 21B, the fourth no-pattern region 21D, the lower edge 20b, and the right edge 20d of the substrate 20. The fourth pattern region 22D is a region surrounded by the first no-pattern region 21A, the fourth no-pattern region 21D, and the lower edge 20b and the left edge 20c of the substrate 20.

[0047] Patterns for connecting components are printed in each of the first to fourth pattern areas 22A to 22D. Of the first to fourth pattern areas 22A to 22D, areas in which no patterns are printed are grounds, and have a potential difference of 0V with respect to the reference voltage.

[0048] By providing the pattern-free areas 21A to 21D and the slits 23A to 23C, the first to fourth pattern areas 22A to 22D can be insulated from each other, and a surge voltage caused by lightning can be prevented from being transmitted to the transmitting device 2 and the power receiving device 3.

[0049] (Components on board 20) 4, a first port 30 and a splitter 11 are provided in a first pattern area 22A of the substrate 20. A LAN connector (not shown) attached to the end of a communication cable 5 is inserted into the first port 30, connecting the communication cable 5 to the splitter 11 on the substrate 20. The first port 30 is provided on the left side of the substrate 20, along the upper edge 20a of the substrate 20. The first port 30 and the splitter 11 are connected by a pattern.

[0050] The fourth pattern region 22D is provided with the injector 12 and a second port 31. A LAN connector (not shown) attached to the tip of the communication cable 5 is inserted into the second port 31, connecting the communication cable 5 with the injector 12 on the substrate 20. The second port 31 is provided along the lower edge 20b of the substrate 20, at a position aligned vertically with the first port 30. The second port 31 is shielded. The second port 31 and the injector 12 are connected by a pattern.

[0051] An LED indicator 32 is provided on the lower edge 20b of the fourth pattern area 22D of the substrate 20. The LED indicator 32 is connected to a boost circuit 36 ​​by a pattern (not shown) and is controlled to be turned on and off. The LED indicator 32 has two LEDs 32A and 32B (FIG. 5), one of which, LED 32A, is turned on while a PoE signal is being received from the transmitting device 2, and the other LED 32B is turned on while a PoE signal is being transmitted to the receiving device.

[0052] An insulated SPD 13 is provided across the first pattern-free area 21A between the first pattern area 22A and the fourth pattern area 22D. That is, one terminal of the insulated SPD 13 is located in the first pattern area 22A, and the other terminal is located in the fourth pattern area 22D. One terminal of the insulated SPD 13 and the splitter 11 in the first pattern area 22A are connected by a pattern constituting a signal line 15, and the other terminal of the insulated SPD 13 and the injector 12 in the fourth pattern area 22D are connected by a pattern constituting the signal line 15. A capacitor (not shown) is provided in the pattern constituting these signal lines 15 to insulate the signal line 15 from the ground and adjust the voltage.

[0053] In plan view, a slit 23A is provided in the first pattern-free region 21A overlapping with the insulating SPD 13. The slit 23A is provided at a position overlapping at least with the insulating SPD 13 in plan view.

[0054] A voltage adjustment circuit 33 is provided in the second pattern area 22B. The voltage adjustment circuit 33 adjusts the voltage input to the isolated DC / DC converter 14 and converts the power separated by the splitter 13A into, for example, DC 12V power. The voltage adjustment circuit 33 is composed of a converter controller switch IC and the like. A connection circuit 34 including a transformer, a photocoupler, and the like is provided across the third pattern-free area 21C between the first pattern area 22A and the second pattern area 22B. A terminal on one side of the connection circuit 34 and the splitter 11 of the first pattern area 22A are connected by a pattern constituting the power supply line 16, and a terminal on the other side of the connection circuit 34 and the voltage adjustment circuit 33 of the second pattern area 22B are connected by a pattern constituting the power supply line 16.

[0055] In addition, an insulating capacitor 35A is provided across the third pattern-free region 21C. The insulating capacitor 35A eliminates the potential difference between the first pattern region 22A and the second pattern region 22B, thereby providing insulation between them.

[0056] An insulating DC / DC converter 14 is provided across the second pattern-free area 21B between the second pattern area 22B and the third pattern area 22C. That is, one terminal of the insulating DC / DC converter 14 is located in the second pattern area 22B, and the other terminal is located in the third pattern area 22C. One terminal of the insulating DC / DC converter 14 and the voltage adjustment circuit 33 of the second pattern area 22B are connected by a pattern that constitutes the power supply line 16, and the other terminal of the insulating DC / DC converter 14 and the boost circuit 36 ​​of the third pattern area 22C are connected by a pattern that constitutes the power supply line 16. In addition, an insulating capacitor 35B is provided across the second pattern-free area 21B. The insulating capacitor 35B eliminates the potential difference between the second pattern area 22B and the third pattern area 22C, providing insulation.

[0057] In plan view, the slit 23C is provided at a position overlapping at least the insulating DC / DC converter 14. In this embodiment, the insulating capacitor 35B is provided at a position overlapping the insulating DC / DC converter 14.

[0058] A boost circuit 36 ​​is provided across the fourth pattern-free area 21D between the third pattern area 22C and the fourth pattern area 22D. The boost circuit 36 ​​boosts the voltage of the power output from the insulated DC / DC converter 14 to a voltage suitable for the power receiving device, and is composed of a switching controller, a PSE controller, a backflow prevention diode, etc. One terminal of the boost circuit 36 ​​is located in the third pattern area 22C, and the other terminal is located in the fourth pattern area 22D. One terminal of the boost circuit 36 ​​and the insulated DC / DC converter 14 of the third pattern area 22C are connected by a pattern that constitutes the power supply line 16, and the other terminal of the boost circuit 36 ​​and the injector 12 of the fourth pattern area 22D are connected by a pattern that constitutes the power supply line 16.

[0059] Moreover, an insulating capacitor 35C is provided across the fourth pattern-free region 21D. The insulating capacitor 35C eliminates the potential difference between the third pattern region 22C and the fourth pattern region 22D, providing insulation therebetween.

[0060] In a plan view of the substrate 20, the insulated SPD 13 is disposed on one side in the horizontal direction along the long side of the rectangular substrate 20, and the pattern of the signal line 15 is provided along the vertical direction, connecting the insulated SPD 13 to the splitter 11 and the injector 12. The insulated DC / DC converter 14 is disposed on the other side in the horizontal direction along the long side of the rectangular substrate 20. The pattern for the power supply line 16 is provided in a substantially U-shape opening to the left side, parallel to the upper edge 20a, the right edge 20d, and the lower edge 20b of the substrate 20, and connects the insulated DC / DC converter 14 to the splitter 11 and the injector 12. That is, the insulated SPD 13 and the insulated DC / DC converter 14 are disposed at positions apart from each other on the substrate 20, and the pattern of the power supply line 16, which is parallel to the pattern of the signal line 15, is disposed so as to follow the right edge 20d of the substrate.

[0061] When the power supply line 16 and the signal line 15 are arranged close to each other, particularly when they are arranged in parallel, an induced current may flow in the signal line 15, generating noise. However, in this embodiment, the pattern of the signal line 15 and the pattern of the power supply line 16 parallel to the pattern of the signal line 15 are arranged on the left and right sides of the lateral direction of the board with as much distance as possible between them, so noise is less likely to occur.

[0062] (Housing 40) As shown in FIG. 5, the housing 40 is a rectangular parallelepiped whose planar shape corresponds to the shape of the substrate 20, and houses the substrate 20 therein. The substrate 20 is fixed inside the housing 40 by a mounting means such as a screw (not shown). The housing 40 may be composed of a housing body and a lid, and in this case, the housing body and the lid may be separated vertically or horizontally and detachable. A first opening 41 for exposing the first port 30 is formed on one side of the housing 40, and a second opening 42 for exposing the second port 31 is formed on the side opposite to the one side of the housing 40. Furthermore, the LEDs 32A and 32B of the LED indicator 32 provided on the substrate 20 are fitted in via the opening beside the first opening 41.

[0063] According to this embodiment, the components are mounted on the board 20 and the board 20 is housed in the housing 40, so that the surge protection device 10 can be made compact and requires less installation space. In addition, the user can configure the system 1 shown in FIG. 1 with the simple task of simply connecting the communication cable 5 to the first port 30 and the second port 31 of the surge protection device 10.

[0064] The dimensions, materials, shapes, relative arrangements, etc. of the components described as embodiments or shown in the drawings are not intended to limit the scope of the present invention, but are merely illustrative examples. Expressions expressing that things are in an equal state, such as "in a certain direction," "along a certain direction," "the same," "identical," "equal," and "homogeneous," not only express a strictly equal state, but also express a state in which there is a tolerance or a difference to the extent that the same function is obtained. Expressions expressing triangular, rectangular, and circular shapes not only express shapes in the strict geometric sense, but also express shapes including uneven parts and chamfered parts, etc., to the extent that the same effect is obtained. Expressions that "include," "have," "include," "include," or "have" one component are not exclusive expressions that exclude the presence of other components. "Parallel" and "orthogonal" mean substantially "parallel" and "orthogonal," and mean not only strictly "parallel" and "orthogonal" states, but also include an error of several degrees. In addition, expressions such as "part" may be used, such as "end portion." For example, "end portion" means a part having a certain range including the "end." The same applies to other expressions that include "... part." [Explanation of symbols]

[0065] 1 System 2. Transmitting Equipment 3. Power receiving device 4 Power supply 5. Communication Cable 10 Surge protection devices 11. Splitter 12 Injector 13 Isolated SPD (first surge protection element) 14 Isolated DC / DC converter (second surge protection element) 15 Signal Line 16 Power supply line 20 Substrate 30 First Port 31 Second Port 40 Housing

Claims

1. A surge protection device that is provided on a PoE-compatible communication line that connects a transmitting device and a receiving device and is capable of transmitting and receiving data signals and supplying power, a splitter connected to the communication line, for receiving and separating the data signal and power outputted to the communication line by the transmitting device; a signal line connected to the splitter and transmitting the data signal separated by the splitter; a power supply line connected to the splitter and transmitting the power separated by the splitter; an injector connected to the signal line and the power supply line, for outputting the received data signal and the power to the communication line; a first surge protection element provided on the signal line; a second surge protection element provided on the power supply line.

2. a substrate on which the splitter, the signal line, the power supply line, the injector, the first surge protection element, and the second surge protection element are provided; The surge protection device of claim 1 , further comprising: a housing that receives the substrate.

3. a first port connected to the splitter and receiving a data signal and power from the PoE-compatible communication line; The surge protection device of claim 2 , further comprising: a second port connected to the injector and configured to output a data signal and power to the PoE-compatible communication line.

4. The substrate, in a plan view, A pattern area is defined in which a pattern is formed, and a pattern-free area is defined in which a pattern is not formed, The surge protection device of claim 2 , wherein the first surge protection element is provided across the pattern-free area.

5. The surge protection device of claim 4 , wherein the pattern-free area overlapping the first surge protection element is provided with a slit.

6. The substrate is rectangular; 3. The surge protection device of claim 2, wherein the first surge protection element is provided on one side along a long side of a rectangle, and the second surge protection element is provided on the other side along a long side of a rectangle.

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