JP4819571B2 - Lightning protection device and security device - Google Patents

Description

  The present invention relates to a lightning arrester that protects an electronic device from an abnormal voltage such as a lightning surge, and a security device incorporating the lightning arrester.

  Conventionally, it has been generally known to mount a lightning protection element in an electronic device using a commercial power source in order to prevent an abnormal voltage such as a lightning surge induced from a telephone line or a power line connected from the field. ing. However, in a multi-lightning region, there is a problem that an excessive voltage is applied to destroy a lightning protection element and damage an electronic device.

  As a solution to such a problem, there is known a lightning protection adapter that bypasses a lightning surge or the like flowing into an electronic device from a telephone line or a power line (see Patent Document 1). Such a lightning protection adapter protects a lightning surge by connecting a lightning protection element to a communication line connected to an electronic device, for example, and further arranges a bidirectional PNPN element having a low operation starting voltage between the communication lines. Therefore, even if a lightning surge occurs between the communication lines due to variations in the operating characteristics of the lightning arresters arranged on the communication line, an excessive voltage is not applied to the electronic apparatus, and the electronic apparatus can be protected from abnormal voltage. it can.

Japanese Patent Laid-Open No. 11-41798

  In the lightning protection adapter described in Patent Literature 1, a bypass circuit in which a lightning protection element is connected to a communication line is further grounded. However, such a circuit configuration has a problem that it is impossible to ensure insulation resistance for preventing leakage or the like. That is, a certain level of insulation is required between the commercial power source and the ground in order to prevent leakage etc., but in order to insulate a predetermined voltage (for example, 500V), the operating voltage is 500V or more. It is necessary to mount a lightning protection element.

  On the other hand, in order to effectively bypass the lightning surge from the electronic device, it is necessary to mount a lightning arrester that operates at a high speed to the steep impulse voltage caused by the lightning surge, and it is advantageous to mount a lightning arrester with a low operating voltage. . In other words, in order to achieve insulation performance to prevent leakage etc. and lightning protection to protect electronic equipment from lightning surges, it is necessary to mount lightning protection elements that operate at conflicting operating voltages, There is a problem that such a lightning protection element does not exist.

  The present invention has been made in view of the above, and by using a conventional lightning arrester, a lightning arrester that simultaneously achieves an insulation performance that prevents electrical leakage and the like, and a lightning arresting performance that effectively bypasses a lightning surge, and An object is to provide a security device incorporating a lightning arrester.

In order to solve the above-described problems and achieve the object, the invention according to claim 1 is a lightning arrester used in a security device for detecting an abnormality in a monitoring region , wherein two or more wirings are connected, and the wiring A bypass path that bypasses the current from the circuit, a ground path that grounds the bypass path, and a voltage between the wiring and the electronic device that is connected to the electronic device that is the connection destination does not cause the electronic device to malfunction. A voltage between the lightning arrester that guides current to the bypass path via the wiring and the grounding path when the second voltage, which is the lowest voltage among the voltages, is exceeded. And a leakage prevention unit that guides a current to the ground side when the voltage exceeds a predetermined first voltage.

According to a second aspect of the present invention, in the lightning arrester according to the first aspect , the leakage prevention unit further includes a voltage obtained by adding the first voltage and the second voltage to the electronic device and the ground. When a voltage necessary to ensure insulation is exceeded, a current is guided to the ground side.

The invention according to claim 3 is the lightning arrester according to claim 1 or 2 , characterized in that the wiring is further connected to a communication line connected to the electronic device.

According to a fourth aspect of the present invention, in the lightning arrester according to any one of the first to third aspects, the wiring is further connected to a power supply line that supplies power to the electronic device. Features.

Moreover, the invention concerning Claim 5 is a security apparatus provided with the lightning arrester of any one of Claims 1-4.

  According to the invention of claim 1, two or more wirings are connected by the bypass path, the current from the wiring is bypassed, the bypass path is grounded by the ground path, and the wiring is connected by the lightning arrester, When the voltage between the lightning protection unit and the lightning protection unit exceeds the predetermined first voltage, the current leakage is guided to the grounding side by the earth leakage prevention unit. Even if it flows from one path, it can be diverted to another path, and current will not flow to the ground unless a predetermined voltage is exceeded, so high lightning performance and insulation are achieved using conventional lightning protection elements. There is an effect that performance can be realized.

Further, according to the invention according to claim 1 , the lightning arrester further guides the current to the bypass path when the voltage between the electronic device of the connection destination exceeds the predetermined second voltage, When an excessive current such as a lightning surge flows, a bypass path can be formed through the current, so that it is possible to prevent the lightning surge from flowing into the electronic device.

According to the first aspect of the present invention, the second voltage is the lowest voltage among the voltages at which the electronic device does not malfunction, so that the lightning arrester operates at a high speed against the lightning surge, and the lightning Since the surge can be passed through the bypass path, there is an effect that high lightning protection performance can be realized.

According to the invention of claim 2 , the leakage prevention unit further includes a voltage obtained by adding the first voltage and the second voltage exceeding a voltage necessary for ensuring insulation between the electronic device and the ground. In this case, since the current does not flow to the ground unless the voltage necessary for securing the insulation is exceeded by guiding the current to the ground side, there is an effect that high insulation performance can be realized.

According to the invention of claim 3 , since the wiring is further connected to the communication line connected to the electronic device, the lightning surge flowing from the communication line can be bypassed. There is an effect that can be realized.

According to the invention of claim 4 , since the wiring is further connected to a power supply line that supplies power to the electronic device, a lightning surge flowing from the power supply line can be bypassed, so that high lightning protection There is an effect that performance can be realized.

  Exemplary embodiments of a lightning arrester according to the present invention and a security device incorporating the lightning arrester will be described below in detail with reference to the accompanying drawings. The present invention is not limited to these embodiments.

(First embodiment)
A first embodiment will be described with reference to the accompanying drawings. The lightning arrester according to the present embodiment protects an electronic device connected to a power supply line or a communication line from an excessive voltage such as a lightning surge and ensures insulation between the electronic device and the ground.

  First, a configuration example of a lightning arrester to which the present invention is applied will be described. FIG. 1 is an explanatory diagram illustrating a configuration of a security system including a lightning arrester according to the first embodiment. The security system 10 according to the present embodiment includes a lightning protection device 100, a control device 200, and a power supply device 300.

  The lightning arrester 100 connects the telephone set 400 from a lightning surge that flows into the power supply apparatus 300 from a power line (commercial power supply), a lightning surge that flows into the control apparatus 200 from a communication line, and a power line (commercial power supply) connected to the telephone set 400. The lightning surge that flows into the control device 200 via the bypass is bypassed, and leakage of electric current and the like is prevented by ensuring insulation between the control device 200 and the power supply device 300 and the ground. FIG. 2 is a block diagram showing the configuration of the lightning arrester. In the lightning arrester 100, the power lines AC <b> 1 and AC <b> 2 are connected to the lightning protection part 101, and the lightning protection part 101 is connected to the bypass path 11 via the wiring 13. In FIG. 1, two power supply lines, communication lines, and wirings are shown as one line segment. The communication lines L1 and L2 are connected to the lightning protection section 102, the communication lines T1 and T2 are connected to the lightning protection section 103, and the lightning protection sections 102 and 103 are further connected to the bypass path 11. The bypass path 11 is grounded by the ground path 12 via the lightning protection unit 110. Moreover, the lightning protection part 110 comprises the electrical leakage prevention part concerning this invention.

  The lightning protection section 110 uses a lightning arrester (bipolar) as a lightning protection element. Here, if the voltage obtained by adding the operating voltage of the lightning arrester (bipolar) used in the lightning arrester 110 and the operating voltage of the lightning arresters used in the lightning arresters 101 to 103 to be described later is, for example, 500 V or more, 500 V or more As a result, it is possible to prevent electrical leakage and the like and to ensure safety. In addition, at present, it is possible to ensure insulation that does not cause a problem even in a 500V insulation resistance test that is conventionally performed.

  In addition, the wirings connected to the bypass path 11 are three paths of the wirings 13, 14, and 15 in FIG. That is, if there are two or more routes, for example, two routes of the power supply lines AC1 and AC2 and the communication lines L1 and L2, a route that bypasses the incoming lightning surge can be configured. In addition to the three paths shown in FIG. 2, a power line between the control device 200 and the power supply device 300 or a fire alarm or various sensors connected to the control device 200 are connected to them. By connecting the power line and the communication line to the lightning arrester in the lightning arrester 100 and further connecting to the bypass path 11, a detour path can be formed, and the lightning flowing in from those power line and communication line The control device 200 can be protected from a surge.

  3 and 4 are explanatory diagrams showing the configuration of the lightning arrester connected to the wiring. A specific configuration of the lightning arresters 101 to 103 will be described. The configuration of the lightning arrester shown in FIG. 3 is an example of the lightning arrester 101 connected to the power supply lines AC1 and AC2. Here, the lightning protection elements are varistors 31 to 33, and when a predetermined voltage is exceeded, the resistance value rapidly decreases, so that a lightning surge flows into the bypass path 11, and the electronic device (for example, the power supply device 300) has a lightning surge. Can be prevented and electronic devices can be protected. Further, by installing the varistor 33 between the two power supply lines, the potential difference between the two power supply lines can be reduced, and current can be prevented from flowing from one power supply line to the other power supply line. Can do.

  4 is an example of the lightning arresters 102 and 103 connected to the communication lines L1 and L2 or the communication lines T1 and T2. Here, the lightning arrester is a lightning arrester (triode) 41, and the lightning arrester (triode) 41 also has a function of reducing the potential difference between the two wires by the varistor 33 described above. As the lightning protection element, an avalanche diode, a surge protection thyristor, or the like may be used in addition to the varistor and the lightning arrester. The configuration of the lightning protection section shown in FIGS. 3 and 4 is not limited to this configuration, and any configuration may be used as long as it has lightning protection performance.

  Moreover, since the lightning protection function with respect to a lightning surge will operate | move earlier so that the operating voltage in a lightning protection element is low, the lightning protection performance improves by using the lightning protection element with a low operating voltage in the lightning protection parts 101-103. Moreover, since the lightning surge flows into the lightning arrester 100 by making the operating voltage of the lightning arrester connected in the lightning arrester 100 lower than the operating voltage of the lightning arrester provided in each electronic device, there is also a detour path to the ground. Can be secured. However, the operating voltage of the lightning protection element of the lightning arrester 100 needs to be a voltage at which the connected electronic device does not malfunction. Furthermore, it is advantageous as lightning protection performance if the lowest voltage among the voltages at which the electronic device does not malfunction.

  As an example of the operating voltage of the lightning arrester, consider a case where the operating voltage of the lightning arresters 101 to 103 is 400V and the operating voltage of the lightning arrester 110 is 500V. In this case, when the lightning surge exceeds 800 V obtained by adding the operating voltages of the inflow lightning arrester and the outflow lightning arrester, the lightning arresters of the lightning arresters 101 to 103 pass the lightning surge to constitute a detour circuit. In addition, when a lightning surge exceeding 900V flows, the lightning surge flows through the lightning protection element of the lightning protection unit 110, and the lightning surge escapes to the ground. For example, when the operating voltage of the lightning protection element in the lightning protection unit 101 is 400 V, the operation voltage of the lightning protection element in the lightning protection units 102 and 103 is 100 V, and the operation voltage of the lightning protection element in the lightning protection unit 110 is 200 V, Since the added value of the operating voltage between the line (commercial power supply) and the ground is 600 V, no current flows to the ground below 600 V, and 500 V insulation is ensured.

  In addition, when the LG terminal and the FG terminal in FIG. 2 are connected from individual electronic devices, they are connected to the bypass path 11 and grounded through the lightning protection unit 110.

  Returning to FIG. 1, the control device 200 monitors the monitoring area, and transmits an alarm to the monitoring center via the communication line when an abnormality is detected by a sensor or the like. As shown in FIG. 1, there is a possibility that the lightning surge will flow into the control device 200 from a communication line connected to the outside or a communication line connected to the telephone 400. The LG terminal is generally grounded, but can be grounded via the bypass path 11 as shown in FIG.

  The power supply device 300 performs AC / DC conversion of AC100V supplied from a commercial power supply into DC12V and supplies the converted voltage to the control device 200. As shown in FIG. 1, in the power supply apparatus 300, there is a possibility that a lightning surge will flow from a power line connected to a commercial power source. The FG terminal is generally grounded, but can be grounded via the bypass path 11 as shown in FIG.

  The telephone 400 transmits / receives audio data via the control device 200. As shown in FIG. 1, a lightning surge may flow into the control device 200 from the power line (commercial power supply) connected to the telephone 400 via the telephone 400. The telephone 400 may be a configuration including a facsimile function or a facsimile apparatus.

  Thus, as shown in FIG. 1, by connecting the power lines AC1 and AC2, the communication lines L1 and L2, and the communication lines T1 and T2 connected to the telephone to the lightning arrester 100, an excessive current such as a lightning surge can be generated. Since the detour path is configured, it is possible to protect the electronic circuit of the security device including the control device 200 and the power supply device 300 from being destroyed, and the current flows to the ground only when a voltage exceeding a predetermined voltage is applied. , Safe insulation performance can be ensured.

  Next, the current flow when a lightning surge actually occurs will be described. FIG. 5 is an explanatory diagram showing a current flow when a lightning surge flows into the power line. In the example shown in FIG. 5, the lightning protection device 100 connects the control device 200 and the power supply device 300. Here, the pole transformer 1000 transforms the transmitted high voltage to AC 100 V (or AC 200 V), and supplies the AC 100 V (or AC 200 V) to the power supply device 300 in the home or office from the power supply lines AC1 and AC2. Further, the pole transformer 1000 allows grounding to release an excessive current such as a lightning surge to the ground. The protector 2000 transmits and receives electrical signals to and from the public line, and grounds to release current to the ground G when a lightning surge flows into the communication lines L1 and L2.

  First, when a lightning surge flows from the power supply lines AC1 and AC2, if the lightning surge voltage exceeds the operating voltage of the lightning arrester 101 of the lightning arrester 100 connected to the power supply lines AC1 and AC2, the lightning surge is detected. It flows to the lightning protection part 101 of. Furthermore, when the voltage obtained by adding the operating voltages of the lightning protection unit 101 and the lightning protection unit 102 is exceeded, a detour route is formed from the lightning protection unit 101 through the lightning protection unit 102 to the communication lines L1 and L2 via the bypass route 11. The Thereby, the lightning surge does not flow into the power supply device 300. The lightning surge that has flowed through the communication lines L1 and L2 escapes to the ground G via the protector 2000. In the lightning arrester 100, if the operating voltage of the lightning arrester 110 is exceeded, a lightning surge escapes from the lightning arrester 100 to the ground G via the lightning arrester 110 and the ground path 12.

  In this way, a lightning surge bypass path of the lightning arrester 100 and the ground G is formed from the lightning arrester 100, the communication lines L1 and L2, the protector 2000, the ground G, and the power lines AC1 and AC2 from the power lines AC1 and AC2. Therefore, the control device 200 and the power supply device 300 can prevent equipment failure without flowing an excessive voltage.

  Furthermore, another example will be described. FIG. 6 is an explanatory diagram showing a current flow when a lightning surge flows from the ground. A case where a lightning surge flows from the ground G, such as when a lightning strikes the ground G, will be described. The lightning surge flows from the ground G to the power lines AC1 and AC2 of each home or office through the grounding of the pole transformer 1000 and the pole transformer 1000. Similarly to the case described above, when the lightning surge voltage exceeds the operating voltage of the lightning protection elements connected to the power supply lines AC1 and AC2 in the lightning arrester 100, the lightning surge flows to the lightning arrester 100. Thereby, the lightning surge does not enter the power supply device 300. In the lightning arrester 100, a lightning surge passes from the lightning arrester 101 through the bypass path 11. When the ground G to which the lightning arrester 100 is grounded has a potential lower than the potential of the ground G grounded to the pole transformer 1000, a lightning surge flows through the lightning arrester of the lightning arrester 110 and escapes to the ground G.

  In this way, the grounding of the pole transformer 1000, the pole transformer 1000, the power lines AC1 and AC2, the lightning arrester 100, and the lightning surge bypass path of the ground G are formed from the ground G. The apparatus 300 can be prevented from malfunctioning without causing an excessive voltage to flow.

(Second Embodiment)
A second embodiment will be described with reference to the accompanying drawings. The security device according to the second embodiment protects each part of the security device connected to the power line and the communication line from an excessive voltage such as a lightning surge, and ensures insulation between the security device and the ground. is there. The first embodiment is different from the first embodiment in that the control device, the power supply device, and the lightning arrester separately configured in the first embodiment are included in the security device.

  FIG. 7 is a block diagram illustrating a configuration of a security device according to the second embodiment. The security device 500 includes a communication unit 501, a control unit 502, a data input / output unit 503, a display unit 504, an operation unit 505, a detection unit 506, a power supply unit 507, and lightning protection units 508 to 512. ing. The communication unit 501, the control unit 502, the data input / output unit 503, the display unit 504, the operation unit 505, or the detection unit 506 constitutes a functional unit according to the present invention.

  The communication unit 501 transmits and receives data to and from the monitoring center via a communication line. The communication unit 501 transmits voice data received via the communication line to the telephone, receives voice data input from the telephone, and transmits the voice data to the communication line.

  The control part 502 controls each part which comprises a security apparatus. The data input / output unit 503 receives detection data transmitted from the detection unit 506 such as a sensor and data input from the operation unit 505, and controls output to data displayed on the display unit 504.

  The display unit 504 displays a current security mode of the security device, a message to the user, and the like. The operation unit 505 is used to input security mode switching or the like. The detection unit 506 is a sensor or the like, detects an abnormality in the monitoring area, and transmits detection data.

  Similarly to the above-described power supply device, the power supply unit 507 performs AC / DC conversion of AC100V supplied from a commercial power supply to DC12V and supplies the converted AC100V to each unit of the security device 500.

  Similarly to the lightning arresters 101 to 103 and 110 shown in the first embodiment, the lightning arresters 508 to 511 are power lines connected to respective parts of the security device 500 when a predetermined operating voltage is exceeded. And the current from the communication line is connected to flow in the bypass path. As a result, an overcurrent detour path such as a lightning surge is formed. In addition, the lightning protection unit 512 is configured to operate to pass current when the current flows from the lightning protection units 508 to 511 and a voltage exceeding a predetermined voltage is applied, and is grounded to the ground.

  As in the first embodiment, the security device 500 configured as described above has an excessive current such as a lightning surge flowing in from a communication line or a power line, and an inflow lightning arrester and an outflow lightning arrester, for example, a lightning arrester 508. If the operating voltage of the lightning arrester 511 is exceeded, a detour path is configured. By such a detour path, the lightning surge that has flowed in from the communication line connected to the telephone is routed to the power line via the lightning arrester 508 and the lightning arrester 511. Therefore, the communication unit 501 and the power supply unit 507 are protected from lightning surge.

  Further, for example, when a lightning surge flowing in from a communication line connected to a telephone exceeds a voltage obtained by adding the operating voltages of the lightning protection unit 508 and the lightning protection unit 512, a current flows to the ground, and the communication unit 501, the power supply unit 507, etc. Protected.

(Third embodiment)
A third embodiment will be described with reference to the accompanying drawings. The security device according to the third embodiment is different from the second embodiment in that devices equipped with each function are configured as independent devices and are connected to communication lines and power lines. Note that, similarly to the second embodiment described above, the security device according to the third embodiment also protects each part of the security device from an excessive voltage such as a lightning surge and also insulates the security device from the ground. It is to secure.

  FIG. 8 is a block diagram illustrating a configuration of a security device according to the third embodiment. The security device 600 includes a communication unit 610, a data input / output unit 620, and a power supply unit 630. The communication unit 610 or the data input / output unit 620 constitutes a functional unit according to the present invention.

  Similar to communication unit 501 described above, communication unit 610 transmits and receives data to and from the monitoring center via a communication line, transmits voice data received via the communication line to the telephone, and voice input from the telephone Data is received and transmitted to the communication line. The communication unit 610 further includes a control unit 611 and lightning protection units 612 to 614.

  The control unit 611 controls transmission / reception of data with the monitoring center and controls transmission / reception of voice data with the telephone. The lightning arresters 612 to 614 constitute a path for bypassing an excessive current such as a lightning surge flowing from the communication line or the power line when the voltage between the lightning arresters exceeds a predetermined operating voltage.

  Similar to the data input / output unit 503 described above, the data input / output unit 620 receives detection data transmitted from a sensor or the like, or data input from the operation unit, and controls output to data displayed on the display unit. Is. The data input / output unit 620 includes a control unit 621 and lightning protection units 622 to 624.

  The control unit 621 controls data input / output. The lightning arresters 622 to 624 constitute a path for bypassing an excessive current such as a lightning surge flowing from the communication line or the power line when the voltage between the lightning arresters exceeds a predetermined operating voltage.

  Similarly to the power supply unit 507 described above, the power supply unit 630 performs AC / DC conversion of AC100V supplied from a commercial power supply to DC12V and supplies the converted AC100V to each unit of the security device 600. The power supply unit 630 further includes a control unit 631 and lightning protection units 632 to 634.

  The control unit 631 controls AC / DC conversion and power supply to each unit. The lightning arresters 632 to 634 provide a path for bypassing an excessive current such as a lightning surge flowing from a power line (DC power supply) or a power line (commercial power supply) when the voltage between the lightning arrestors exceeds a predetermined operating voltage. It constitutes.

  FIG. 9 is an explanatory diagram showing a current flow when a lightning surge flows into the communication line. In the security device 600 configured as shown in FIG. 8, when a lightning surge flows from the communication line of the data input / output unit 620, as an example, the lightning surge is transmitted from the communication line to the data input / output unit 620 as shown in FIG. Inflow. However, in this case, the control unit 621 of the data input / output unit 620 bypasses through the lightning protection unit 623 and the lightning protection unit 624. Further, although the lightning surge flows into the communication unit 610, it passes through the lightning protection unit 614 and the lightning protection unit 613, and goes out to the communication line. As a result, the data input / output unit 620 and the communication unit 610 are protected from lightning surge.

  FIG. 10 is an explanatory diagram showing the flow of current when a lightning surge flows into the power line. Consider a case in which a lightning surge flows from a DC power line between the communication unit 610 and the power supply unit 630 in the security device 600. In this case, as an example, as shown in FIG. 10, the lightning surge passes through the lightning arrester 632 of the power supply unit 630 and flows to the ground through the lightning arrester 634. Thereby, the control part 631 of the power supply part 630 is protected from a lightning surge.

  Another configuration of the security device will be described. FIG. 11 is a block diagram illustrating a configuration of a security device according to another embodiment. The security device 700 according to the present embodiment includes a data input / output unit 620, a power supply unit 630, and a detection unit 640. The present embodiment is different in that a detection unit 640 is provided instead of the communication unit 610 of the third embodiment. Since the data input / output unit 620 and the power source unit 630 are the same as those in the third embodiment described above, the description is omitted with reference to the above description. The data input / output unit 620 or the detection unit 640 constitutes a functional unit according to the present invention.

  The detection unit 640 is a sensor or the like, and detects an abnormality in the monitoring area and transmits detection data. The detection unit 640 further includes a control unit 641 and lightning protection units 642 and 643. The control unit 641 controls transmission of detection data and the like. The lightning arresters 642 and 643 constitute a path for bypassing an excessive current such as a lightning surge flowing from the data output line or the power supply line when the voltage between the lightning arresters exceeds a predetermined operating voltage.

  FIG. 12 is an explanatory diagram showing a current flow when a lightning surge flows into the data output line. Consider a case in which a lightning surge flows from the data output line into the detection unit 640 in the security device 700 configured as shown in FIG. As an example, the lightning surge passes from the lightning arrester 642 of the detection unit 640 through the lightning arrester 643 and bypasses the control unit 641 of the detection unit 640. Accordingly, the detection unit 640 is protected from lightning surge.

  Further, the lightning surge flows into the power supply unit 630 through the DC power supply line. In this case, the lightning surge escapes from the lightning arrester 632 of the power supply unit 630 to the ground through the lightning arrester 634. Thereby, the power supply part 630 is protected from a lightning surge.

  In this way, with the above-described configuration, by installing a lightning protection circuit for various devices, the internal circuit of each device, that is, the control unit is damaged even if a lightning surge enters from any part of the connected wiring. It is possible to protect each device without reaching.

  The security device protects each device of the security device from lightning surges as long as the third embodiment is provided with a detection unit, a configuration with other devices, or a configuration with a lightning protection unit. can do.

  In the above-described embodiments, an example in which a lightning protection circuit that bypasses an excessive voltage such as a lightning surge and prevents equipment failure is applied to a security system or a security device has been described. When a plurality of wires are connected to one electronic device, when one wire is connected to each of a plurality of electronic devices, and when a plurality of wires are connected to a plurality of electronic devices For example, it can be applied if a detour path can be secured for the electronic device, and high lightning protection performance and insulation performance can be realized. For example, the present invention can be applied to a large-scale security system in which a large number of sensors and security devices are connected, an information processing system, a personal computer, and a plurality of household appliances connected in the home.

  FIG. 13 is a block diagram illustrating a configuration of a functional unit including a lightning protection unit. As shown in FIG. 13, when two wires are connected to the control unit 71 of the functional unit 70, the control unit 71 can be protected from lightning surge by providing the lightning protection unit 72 and the lightning protection unit 73.

  FIG. 14 is a block diagram illustrating a configuration of a functional unit including a lightning protection unit. As shown in FIG. 14, when three wirings are connected to the control unit 81 of the functional unit 80, a bypass circuit is configured for lightning surges flowing in from any wiring by providing the lightning protection units 82 to 84. The control unit 81 can be protected from lightning surge.

  FIG. 15 is a block diagram illustrating a configuration of a functional unit including a lightning protection unit. As shown in FIG. 15, when two wirings are connected to the control unit 91 of the functional unit 90, by providing the lightning protection units 92 to 94, for example, from one wiring through the lightning protection unit 92 and the lightning protection unit 93. The lightning surge can be bypassed to the other wiring, and the lightning surge can be released to the ground from the lightning protection portion 92 via the lightning protection portion 94. Thereby, the control part 91 can be protected from a lightning surge.

  In addition, by combining the functional unit 90 having the configuration shown in FIG. 15 and other functional units, using a conventional lightning arrester, an insulation performance for preventing leakage etc. and a lightning arresting performance for effectively bypassing a lightning surge can be obtained. It can be realized at the same time.

It is explanatory drawing which shows the structure of the security system containing the lightning arrester concerning 1st Embodiment. It is a block diagram which shows the structure of a lightning arrester. It is explanatory drawing which shows the structure of the lightning protection part connected to wiring. It is explanatory drawing which shows the structure of the lightning protection part connected to wiring. It is explanatory drawing which shows the flow of an electric current when a lightning surge flows into a power wire. It is explanatory drawing which shows the flow of an electric current when the lightning surge flows in from the ground. It is a block diagram which shows the structure of the security apparatus concerning 2nd Embodiment. It is a block diagram which shows the structure of the security apparatus concerning 3rd Embodiment. It is explanatory drawing which shows the flow of an electric current when a lightning surge flows into a communication line. It is explanatory drawing which shows the flow of an electric current when a lightning surge flows into a power wire. It is a block diagram which shows the structure of the security apparatus concerning other embodiment. It is explanatory drawing which shows the flow of an electric current when a lightning surge flows into a data output line. It is a block diagram which shows the structure of a function part provided with a lightning protection part. It is a block diagram which shows the structure of a function part provided with a lightning protection part. It is a block diagram which shows the structure of a function part provided with a lightning protection part.

Explanation of symbols

10 Security System 12 Grounding Route 13, 14, 15 Wiring 31, 32, 33 Varistor 41 Lightning Arrester (Tripolar)
70, 80, 90 Function unit 71, 81, 91 Control unit 72, 73, 82-84, 92-94 Lightning protection unit 100 Lightning arrester 200 Control device 300 Power supply device 400 Telephone 101-103, 110, 508-512, 612 614,
622-624, 632-634, 642, 643 Lightning protection unit 500, 600, 700 Security device 501, 610 Communication unit 502, 611, 621, 631, 641 Control unit 503, 620 Data input / output unit 504 Display unit 505 Operation unit 506 , 640 detector 630 power supply unit 1000 pole transformer 2000 protector AC1, AC2 power line L1, L2 communication line T1, T1 communication line (between control device and telephone)
G ground

Claims (5)

A lightning arrester used for a security device that detects an abnormality in a monitoring area,
Two or more wirings are connected, and a bypass path for bypassing current from the wirings;
A ground path for grounding the bypass path;
When the voltage between the wiring and the electronic device connected to the connected electronic device exceeds the second voltage, which is the lowest voltage among the voltages at which the electronic device does not malfunction, the wiring A lightning arrester for guiding current to the bypass path via
An earth leakage prevention unit that is connected in the ground path and guides a current to the ground side when a voltage between the lightning protection unit exceeds a predetermined first voltage;
A lightning protection device comprising: The leakage prevention unit further supplies a current to the ground side when a voltage obtained by adding the first voltage and the second voltage exceeds a voltage necessary to ensure insulation between the electronic device and the ground. The lightning arrester according to claim 1 , wherein: The lightning arrester according to claim 1 or 2 , wherein the wiring is further connected to a communication line connected to the electronic device. The lightning protection device according to any one of claims 1 to 3 , wherein the wiring is further connected to a power supply line that supplies power to the electronic device. A security device comprising the lightning arrester according to any one of claims 1 to 4.

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