JP4287224B2 - Lighting break detection processing device - Google Patents

Description

  The present invention relates to a lamp disconnection detection processing device that detects a disconnection of a lamp installed on a runway, a taxiway or the like of an airport.

  On airport runways and taxiways, guide lights and control lights (hereinafter referred to as lights) for guiding aircraft are arranged. These lighting circuits are provided with one current transformer for each lamp, and the primary side of each current transformer is connected in series to form a closed circuit. On the secondary side of these current transformers Each is connected to one lamp.

  FIG. 4 is a circuit diagram of a conventional lamp lighting circuit. As shown in FIG. 4, the constant current power supply device 10 is configured such that the primary sides of a plurality of current transformers 11 are connected in series to form a closed circuit, and a lamp 12 is connected to the secondary sides of these current transformers 11. It is said. In the conventional lamp lighting circuit configured as described above, when disconnection occurs in the lamp 12 connected to the secondary side of the current transformer 11, the disconnected lamp 12 is turned off and the connected lamp is connected. Since the secondary side of the current transformer 11 is open, a high voltage corresponding to the saturation voltage of the current transformer 11 is generated on the secondary side of the current transformer 11.

  When disconnection occurs in the lamp 12, the lamp 12 is replaced. However, since a high voltage is generated on the secondary side of the current transformer 11, it is necessary to ensure the safety of maintenance personnel from the high voltage. There is sex. Then, the constant current power supply device 10 is made into a power failure state, and the lamp 12 is replaced. In this case, all the lights 12 connected to the constant current power supply device 10 are turned off.

  As a recent trend, airports have been operated 24 hours a day, and management is required to continue operation as much as possible even when the lamp 12 is replaced. For this reason, it is assumed that the operation is restricted due to airport regulations. In addition, there are thousands of lights 12 installed at the airport, and it is practically impossible to grasp the number and position of broken lights 12 in real time, and high voltage is generated. If the secondary side of the current transformer 11 is left as it is, there is a risk of leading to a serious accident such as electric shock or fire.

  In order to solve these problems, the lamp lighting circuit detects the occurrence of disconnection in the lamp 12 and prevents a high voltage from being generated on the secondary side of the current transformer 11. Is being applied. FIG. 5 shows an example of a conventional lamp disconnection detection processing apparatus. The lamp disconnection detection processing device 13 is connected between the secondary side of the current transformer 11 and the lamp 12, and is provided for each lamp 12.

  A lamp 12 is connected to the secondary side of the current transformer 11 via a power supply circuit 17 and a current detection circuit 16, and the current detection circuit 16 monitors the disconnection of the lamp 12. Further, a bypass circuit 15 for bypassing the current detection circuit 16 and the lamp 12 is provided, and the bypass circuit 15 is open when the lamp 12 is normal.

  When the lamp 12 is disconnected, the current that has been flowing to the lamp 12 is interrupted. Therefore, when the current detection circuit 16 detects the current interruption to the lamp 12, the arithmetic processing circuit 14 drives the relay 21. Then, the contact 15a of the bypass circuit 15 is closed, and both ends of the lamp 12 are short-circuited to prevent generation of a high voltage. At the same time, the external device 19 is notified of the occurrence of disconnection via the transmission control circuit 18 and the communication medium 20.

  In this case, individual address information given in advance to the lamp disconnection detection processing device 13 is added and transmitted to the external device 19. Thereby, the external device 19 can specify the position where the disconnection occurs. The external device 19 is a monitoring device or the like installed in the monitoring room.

As a lamp disconnection detection processing device, there is one that detects which lamp is disconnected from a number of lamps by using a synchronization signal. Can be detected (see, for example, Patent Document 1).
JP-A-5-21174 (FIGS. 1 and 2)

  However, in the conventional lamp disconnection detection processing device, in order to replace the lamp in which the disconnection is detected and confirm that the replacement is properly performed, the contact 15a of the bypass circuit 15 is once opened. In this case, if the replaced lamp 12 is in a disconnected state, a high voltage is generated across the lamp 12. Therefore, there is a possibility of causing a serious accident such as an electric shock to maintenance personnel during the replacement work.

  In order to avoid such a risk, the actual replacement work of the lamp 12 is performed in a state where the output of the constant current power supply device 10 is reduced. In this case, the operation of reducing the output of the constant current power supply device 10 is performed by maintenance personnel such as a monitoring room, not maintenance personnel who perform the lamp 12 replacement work or the like. Maintenance personnel who perform replacement work and maintenance personnel in the monitoring room and the like are communicating with each other by wireless communication, etc., but airport facilities are installed over a wide area, and it may be difficult to communicate with each other. It is done. If the communication cannot be made well and the output of the constant current power supply device 10 cannot be reduced, there is a possibility that a serious accident such as an electric shock may occur in the maintenance staff.

  An object of the present invention is to provide a lamp disconnection detection processing apparatus capable of ensuring the safety of maintenance personnel in lamp replacement work and improving the maintenance work efficiency.

  A lamp disconnection detection processing apparatus according to the present invention supplies a current from a constant current power supply device connected to a primary side of a current transformer to a lamp connected to the secondary side of the current transformer to light the lamp. Is provided in a circuit to detect the disconnection of the lamp from the current interruption state supplied to the lamp, and when the disconnection of the lamp is detected, the lamp is bypassed to connect the secondary side of the current transformer. In a lamp disconnection detection processing apparatus that short-circuits and notifies the lamp disconnection to an external device, a current detection circuit that detects a current supplied to the lamp and a lamp that is provided in parallel with the lamp are disconnected. A bypass circuit that is sometimes closed, and a voltage generator that is connected in series to the bypass circuit and that passes a current from the secondary side of the current transformer when the bypass circuit is closed, and generates a predetermined voltage, and The current detected by the current detection circuit An arithmetic processing circuit for closing the bypass circuit and determining that the disconnection of the lamp has been restored when the current detection circuit detects a current flowing to the lamp by the voltage of the voltage generation unit in that state. It is characterized by having.

  In this case, the arithmetic processing circuit may determine that the disconnection of the lamp has been restored when the current flowing through the lamp is stabilized for a certain time or longer due to the voltage of the voltage generator. The arithmetic processing circuit opens the bypass circuit when it is determined that the lighting disconnection has been restored. This completes the lamp replacement operation.

  In addition, when the arithmetic processing circuit determines that the disconnection of the lamp has been restored, the arithmetic processing circuit may notify the external device to that effect, and in this case, the arithmetic processing circuit issues a command to open the bypass circuit by the external device. And the bypass circuit may be opened. The voltage generating unit is composed of an anti-parallel diode connected in series with a bypass circuit.

  According to the present invention, since no high voltage is generated when the restoration of the lamp disconnection is confirmed, it is possible to ensure the safety of maintenance personnel for the lamp replacement work. In addition, since the lamp can be replaced while the constant current power supply is energized, the maintenance work efficiency can be improved, and the lamp can be replaced while the normal lamp is on. Can greatly contribute to the response.

  When the bypass circuit that bypasses the lamp is closed when the lamp is disconnected, a voltage generator that passes the current from the secondary side of the current transformer and generates a predetermined voltage is connected to the bypass circuit, and the lamp is disconnected. At the time of occurrence, it is detected that the lamp has been exchanged by monitoring the state of the current flowing to the lamp side based on the voltage generated at the voltage generator. Therefore, it is possible to prevent a high voltage from being generated on the secondary side of the current transformer when confirming the replacement of the lamp.

  FIG. 1 is a configuration diagram of a lamp disconnection detection processing device 13 according to the first embodiment of the present invention. The first embodiment is different from the conventional example shown in FIG. 5 in that a current from the secondary side of the current transformer 11 is passed in series with the contact 15a of the bypass circuit 15 when the contact 15a is closed. The voltage generator 22 for generating the above is additionally provided. The same elements as those in the conventional example shown in FIG.

  The lamp disconnection detection processing device 13 is connected between the current transformer 11 and the lamp 12, and the contact 15a of the bypass circuit 15 when the lamp 12 is normal is in an open state. When the contact 15a of the bypass circuit 15 is connected to the voltage generator 22 in series with the contact 15a and the contact 15a of the bypass circuit 15 is closed, the current from the secondary side of the current transformer 11 is allowed to pass therethrough. Generate voltage. The voltage generator 22 is composed of a resistor or an antiparallel diode. In FIG. 1, the case where it comprised with the antiparallel diode, ie, the positive / negative reverse direction parallel rectifier, is shown.

  When disconnection occurs in the lamp 12, the current that has been flowing through the lamp 12 until then is cut off. The interruption of the current flowing through the lamp 12 is detected by the current detection circuit 16. When the current detection circuit 16 detects that the current flowing through the lamp 12 is interrupted, the arithmetic processing circuit 14 drives the relay 21 to close the contact 15 a of the bypass circuit 15. Thereby, the current from the current transformer 11 bypasses the lamp 12 and flows to the bypass circuit 15. That is, since an alternating current from the secondary side of the current transformer 11 flows through the anti-parallel diode of the voltage generator 22, the secondary side of the current transformer 11 is short-circuited and a high voltage is applied to the secondary side of the current transformer 11. Prevents from occurring.

  Then, the occurrence of disconnection is notified to the external device 19 installed in the monitoring room or the like via the transmission control circuit 18 and the communication medium 20. Since individual address information is given in advance to the lamp disconnection detection processing device 13, the external device 19 can specify the position where the disconnection has occurred (lamp disconnection detection processing device 13).

  Here, when a forward current flows through the voltage generator 22 (an antiparallel diode), a weak forward voltage is generated at both ends of the forward diode. That is, when an AC current flows through both ends of the voltage generator 22 (anti-parallel diode) at the time of occurrence of disconnection, a terminal voltage as shown in FIG. 2 is generated.

  FIG. 2 is a characteristic diagram of the voltage Va generated at both ends of the voltage generating section 22 when an alternating current Ia flows through both ends of the voltage generating section 22 of the bypass circuit 15. Since this generated voltage Va is applied to both ends of the lamp 12, when the lamp 12 is disconnected and the bypass circuit 15 is closed, the lamp 12 is replaced and a normal lamp 12 is connected. In this case, a minute current flows through the lamp 12 by the generated voltage Va.

  The current detection circuit 16 detects this minute current and outputs it to the arithmetic processing circuit 14. The arithmetic processing circuit 14 determines that the disconnection of the lamp 12 has been restored when the current detection circuit 16 detects the current flowing through the lamp 12 based on the voltage of the voltage generator 22 (an antiparallel diode). Thereafter, the contact 15 a of the bypass circuit 15 is opened, and the secondary current of the current transformer 11 is applied to the lamp 12. Thereby, the recovery work is completed.

  According to the first embodiment of the present invention, the current state flowing through the lamp 12 is monitored based on the terminal voltage of the voltage generator 22 of the bypass circuit 15, and the lamp 12 has been safely replaced without generating a high voltage. Can be detected. Therefore, even when the maintenance personnel try to replace the lamp 12 in the energized state, only a weak voltage generated at both ends of the voltage generator 22 of the bypass circuit 15 is applied to both ends of the lamp 12, so that the safety of the maintenance staff is improved. Secured.

  In addition, since it is possible to detect in real time that the lamp 12 has been replaced by the current detection circuit 16, it is possible to supply a current to the lamp 12 with the contact 15a of the bypass circuit 15 open as appropriate. Thus, it is possible to finish the work of confirming the restoration on the spot without exchanging with the monitoring room, etc., so that the work efficiency of maintenance personnel is improved.

  In the first embodiment of the present invention described above, when the arithmetic processing circuit 14 detects that the current flowing through the lamp 12 is detected by the voltage of the voltage generator 22 while the contact 15a of the bypass circuit 15 is closed. In the second embodiment of the present invention, when the current flowing through the lamp 12 has been stabilized for a certain time or longer due to the voltage of the voltage generator 22, It is determined that the disconnection of the lamp 12 has been restored.

  FIG. 3 is a characteristic diagram of the current i detected by the current detection circuit 16 when the lamp 12 is replaced in the second embodiment of the present invention. When the lamp 12 is broken, and the lamp 12 with the broken core is attached, even if the constant current power supply 10 is in an energized state, no current flows through the lamp 12 where the broken core is generated. Therefore, the current i detected by the current detection circuit 16 is zero. In this state, when the normal lamp 12 is mounted, it is assumed that a current i accompanied by chattering as shown in FIG. 3 flows in a predetermined period Ta after the lamp 12 is mounted.

  When the arithmetic processing circuit 14 determines that the lamp 12 is restored in the state of the period Ta in FIG. 3 and the contact 15a of the bypass circuit 15 is opened in the period Ta, the chattering occurs. Since a current is supplied to the lamp 12 from the secondary side of the current transformer 11, there is a risk that chattering with a high voltage occurs at both ends of the lamp 12.

  Therefore, in the second embodiment of the present invention, the arithmetic processing circuit 14 keeps the contact 15a of the bypass circuit 15 in a short-circuited state until the output of the current detection circuit 16 is stabilized for a predetermined time Tb set to an appropriate value in advance. . This ensures the safety of maintenance personnel.

  In FIG. 3, since no current flows through the lamp 12 during disconnection, this is determined by monitoring the output of the current detection circuit 16 by the arithmetic processing circuit 14, and the contact 15a of the bypass circuit 15 is kept in a short-circuit state. During this time, the voltage generated at both ends of the voltage generator 22 (anti-parallel diode) generates only a weak voltage, so that the safety of maintenance personnel is ensured.

  In other words, the connection state of the lamp 12 is not stable during the predetermined period Ta during the replacement work of the lamp 12, and the output of the current detection circuit 16 is detected as an unstable state. During this period Ta, the contact 15a of the bypass circuit 15 is still kept short-circuited. During this period Ta, the voltage generated at both ends of the voltage generator 22 (anti-parallel diode) generates only a weak voltage, so that the safety of maintenance personnel during replacement work is ensured.

  Next, the arithmetic processing circuit 14 confirms that the output of the current detection circuit 16 is stable for a preset time Tb after the output of the current detection circuit 16 becomes stable without chattering. However, the contact 15a of the bypass circuit 15 is still kept short-circuited. Even during this period Tb, the voltage generated at both ends of the voltage generator 22 (antiparallel diode) generates only a weak voltage, so that the safety of maintenance personnel during the replacement work is ensured.

  Further, when the arithmetic processing circuit 14 confirms that the stable output of the current detection circuit 16 continues for the period Tb or longer, the arithmetic circuit 14 turns on the lamp 12 with the contact 15a of the bypass circuit 15 opened. At this time, even if the contact 15a of the bypass circuit 15 is opened, chattering does not occur, so no high voltage is generated, and the safety of maintenance personnel during replacement work is ensured.

  According to the second embodiment of the present invention, in addition to the effects of the first embodiment, when the maintenance staff replaces the lamp 12 while the constant current power supply device 10 is energized, the current flowing through the lamp 12 continues for a certain time or more. Since the bypass circuit 15 is opened when it is stable, high voltage due to chattering does not occur at both ends of the lamp 12. Therefore, the safety of maintenance personnel is ensured.

  In the first and second embodiments of the present invention described above, the contact 15a of the bypass circuit 15 is opened according to the determination of the arithmetic processing circuit 14, but in the third embodiment of the present invention, the external device 19 In response to this command, the contact 15a of the bypass circuit 15 is opened.

  In the first and second embodiments of the present invention, when the arithmetic processing circuit 14 determines that the disconnection of the lamp 12 has been restored, the contact 15a of the bypass circuit 15 is mechanically opened. For this reason, if a maintenance person tries to remove the lamp 12 at the same time, or if a new disconnection occurs immediately after the contact 15a of the bypass circuit 15 is opened, a lamp disconnection detection process is performed. The device 13 closes the contact 15a of the bypass circuit 15 to ensure the safety of maintenance personnel. However, in that case, there is a danger because a high voltage may be instantaneously generated from the limit of the response speed.

  In the third embodiment of the present invention, after detecting that the lamp 12 has been replaced according to the first or second embodiment, the contact 15a of the bypass circuit 15 is not opened according to the judgment of the arithmetic processing circuit 14, The safety of maintenance personnel is ensured by opening the contact 15a of the bypass circuit 15 according to a command from a monitoring room or the like.

  According to the first or second embodiment, when the arithmetic processing circuit 14 detects that the lamp 12 has been replaced from the output of the current detection circuit 16, the transmission control circuit 18 maintains the contact 15a of the bypass circuit 15 in a short-circuited state. And the communication medium 20 notify the external device 19 installed in the monitoring room or the like that the lamp 12 has been replaced. During this time, only weak voltage generated at both ends of the voltage generator 22 (anti-parallel diode) is generated, so that safety of maintenance personnel during replacement work is ensured.

  Next, the maintenance personnel during the replacement work of the lamp 12 ensure their own safety, and then the maintenance personnel during the replacement work of the lamp 12 themselves or by wireless communication or the like, the bypass circuit of the relevant lamp disconnection detection processing device 13 The maintenance personnel such as the monitoring room are requested to open the 15 contacts 15a. Maintenance personnel such as a monitoring room open the contact 15a of the bypass circuit 15 of the lamp disconnection detection processing device 13 from the external device 19 via the communication medium 20 and the transmission control circuit 18 in response to a request from the maintenance personnel during the replacement work. A request for setting a state is transmitted to the arithmetic processing circuit 14. This ensures the safety of maintenance personnel during replacement work.

  According to the third embodiment of the present invention, it is possible to ensure safety for each individual lamp break detection processing device 13, so that the lamp 12 is replaced without turning off other normal lamps 12. It is possible to improve the efficiency of work as well as improve the efficiency of airport operations.

1 is a configuration diagram of a lamp disconnection detection processing apparatus according to Embodiment 1 of the present invention. FIG. 5 is a characteristic diagram of a voltage Va generated at both ends of the voltage generating section when an alternating current Ia flows through both ends of the voltage generating section of the bypass circuit in Embodiment 1 of the present invention. The characteristic view of the electric current i which the electric current detection circuit at the time of performing the replacement | exchange work of the lamp in Example 2 of this invention detects. The circuit diagram of the conventional lamp lighting circuit. The block diagram which shows an example of the conventional lighting disconnection detection processing apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Constant current power supply device, 11 ... Current transformer, 12 ... Light, 13 ... Light disconnection detection processing device, 14 ... Arithmetic processing circuit, 15 ... Bypass circuit, 16 ... Current detection circuit, 17 ... Power supply circuit, 18 ... Transmission control circuit, 19 ... external storage, 20 ... communication medium, 21 ... relay, 22 ... voltage generator

Claims (6)

A constant current power supply device connected to the primary side of the current transformer is provided in a circuit that supplies current to the lamp connected to the secondary side of the current transformer to light the lamp, and is supplied to the lamp When the disconnection of the lamp is detected from a current disconnection state and the disconnection of the lamp is detected, the lamp is bypassed and the secondary side of the current transformer is short-circuited and the disconnection of the lamp is connected to an external device. In the lamp disconnection detection processing device to notify, a current detection circuit for detecting a current supplied to the lamp, a bypass circuit provided in parallel with the lamp and closed when the lamp is disconnected, and the bypass circuit When the bypass circuit is closed in series, the voltage generator that passes the current from the secondary side of the current transformer and generates a predetermined voltage, and the current detected by the current detection circuit becomes zero. Close the bypass circuit. A lamp breakage detection device comprising: an arithmetic processing circuit that determines that the breakage of the lamp has been restored when the current detection circuit detects a current flowing through the lamp by the voltage of the voltage generator in a state. Processing equipment. 2. The lamp according to claim 1, wherein the arithmetic processing circuit determines that the disconnection of the lamp has been restored when the current flowing through the lamp is stabilized for a predetermined time or longer by the voltage of the voltage generation unit. Breakage detection processing device. 3. The lamp disconnection detection processing apparatus according to claim 1, wherein the arithmetic processing circuit opens the bypass circuit when it is determined that the lamp disconnection is restored. 3. The lamp disconnection detection processing apparatus according to claim 1, wherein when the calculation processing circuit determines that the lamp disconnection has been restored, the arithmetic processing circuit notifies the external apparatus of the fact. 3. 5. The external device outputs an instruction to open the bypass circuit to the arithmetic processing circuit when receiving a notification from the arithmetic processing circuit that the lighting disconnection has been restored. Lighting break detection processing equipment. The lamp breakage detection processing device according to any one of claims 1 to 5, wherein the voltage generator is an antiparallel diode connected in series to the bypass circuit.

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