JP2006092909A - Lamp lighting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lamp lighting device facilitating confirmation of recovery associated with lamp replacement and capable of ensuring safety for a maintenance person. <P>SOLUTION: A switchable bypass circuit 51 is connected in parallel with a lamp 2; the bypass circuit 51 is closed when the filament of the lamp 2 is broken; a minute voltage generated between both ends of a switching element 30 in an on-state is applied between both ends of the lamp 2; and a minute current flowing through a substituted sound lamp 2 is detected by a second current detection circuit 62 based on the minute voltage to determine that the lamp 2 is recovered when the value thereof is above an expected value, whereby recovery confirmation is easy and sure, and safety for a maintenance person can be ensured. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a lamp lighting device having a lamp disconnection detecting function installed on a runway, a taxiway or the like of an airport.

  On airport runways and taxiways, guide lights and control lights are lit to guide the aircraft. As shown in FIG. 5, the conventional lamp lighting device forms a closed circuit by connecting the primary sides of a plurality of current transformers 1 in series to a constant current power source apparatus 10 that is an AC power source. A light 2 is connected to the secondary side of 1. When the lamp 2 connected to the secondary side of the current transformer 1 is disconnected, the disconnected lamp 2 is turned off, and the secondary side of the connected current transformer 1 is opened and disconnected. A high voltage corresponding to the saturation voltage of the current transformer 1 is generated at both ends of the lamp.

  As a recent trend, airports have been operated 24 hours a day, and there is a need for management that can continue operation as much as possible even when lamps are replaced. However, in order to ensure the safety of maintenance personnel from the high voltage described above, the replacement of the lamp has been carried out with the constant current power supply device 10 in a power failure state. In this case, since all the lights 2 connected to the constant current power supply device 10 are extinguished, it is assumed that the operation is restricted due to airport regulations. In addition, the number of lights installed at the airport is thousands of lights, and it is practically difficult to grasp the number and position of broken lights in real time. Furthermore, if the secondary side of the current transformer in which high voltage is generated is left as it is, there is a risk of causing an accident such as an electric shock or a fire.

  In order to solve these problems, the application of an aviation lamp breakage detection device has been promoted (see, for example, Patent Document 1). In this device, a bypass circuit that opens and closes by a contact is connected in parallel to a lamp connected to a secondary circuit of a current transformer. This bypass circuit is open when the lamp is normal. When a disconnection occurs in the lamp, the current that was flowing to the lamp is interrupted. Therefore, the disconnection is detected by the current detection circuit that detects the current to the lamp, and the bypass circuit is closed based on that information. The high voltage is prevented by short-circuiting both ends of the lamp. Further, the transmission control circuit and the communication medium notify an external device (such as a central monitoring device) of the occurrence of disconnection. At this time, by adding individual address information given to each lamp in advance, the position where the disconnection occurs can be specified.

  However, in this method, it is necessary to temporarily open the contact of the bypass circuit as means for detecting that the lamp has been replaced by maintenance work or the like. At this time, if the lamp is in a disconnected state, a high voltage is generated between the two ends, which causes a problem in terms of safety for maintenance personnel during work.

In order to avoid such a danger, the actual lamp replacement operation is performed with the output of the constant current power supply device lowered. However, the airport facilities are installed over a wide area, and there is no wireless connection between maintenance personnel who operate the constant current power supply device in the monitoring room, etc., and maintenance personnel who perform lamp replacement on the runway or taxiway. You must communicate via communication. For this reason, a situation may occur where communication cannot be made well. In this case, there is still a problem in safety.
JP 7-237598 A

  As described above, in the conventional technology, there is room for improvement in terms of ensuring safety in the confirmation operation after the disconnection restoration by lamp replacement.

  An object of the present invention is to provide a lamp lighting device that is easy to check for recovery due to lamp replacement and can ensure safety for maintenance personnel.

  The lamp lighting device according to the present invention forms a closed circuit in which an AC power source is connected to the primary side of the current transformer and a lamp is connected to the secondary side, and the lamp is lit by the current supplied by the closed circuit. A lamp lighting device comprising an AC switching element, connected in parallel to the lamp and capable of opening and closing, and a first current detection circuit capable of detecting a current flowing through the bypass circuit And a second current detection circuit capable of detecting a current flowing through the lamp, and the bypass circuit is opened when the lamp is normally lit, and when the second current detection means detects the disconnection of the lamp. And a weak voltage generated at both ends of the switching element in the ON state is applied to both ends of the lamp. Based on the weak voltage, a minute current flowing through the replaced healthy lamp is applied to the second electric current. And detecting the detection circuit determines that lighting restoration if the value is above a predetermined value, characterized in that an arithmetic processing circuit for opening the bypass circuit.

  Further, in the present invention, when the arithmetic processing circuit determines that the lamp is restored based on the small current value flowing through the replaced healthy lamp, the arithmetic circuit notifies the external apparatus of the restoration of the lamp, and the bypass circuit by an open command from the external apparatus. The structure which opens may be sufficient.

  Further, in the present invention, the arithmetic processing circuit has a function of inputting the detection current of the first current detection circuit when the bypass circuit is closed and turning off the on-state switching element for a predetermined period at each zero cross timing.

  In this case, the arithmetic processing circuit inputs the detection result of the second current detection circuit when the bypass circuit is closed, and increases the OFF period of the switching element if the magnitude of the detection current is not more than a predetermined value.

  In the present invention, the arithmetic processing circuit may determine that the lamp has been restored on the condition that the minute current value detected by the second current detection circuit is equal to or greater than a predetermined value and has continued for a predetermined time.

  According to the present invention, a bypass circuit that can be opened and closed with respect to a lamp is connected in parallel, the bypass circuit is closed when the lamp is disconnected, and the weak voltage generated at both ends of the switching element in the on state is supplied to the lamp. Applied to both ends, based on this weak voltage, the minute current flowing in the replaced healthy lamp is detected, and if the value is more than the planned value, it is judged that the lamp is restored, so the restoration confirmation is easy and reliable, Safety for maintenance personnel can also be ensured.

  Hereinafter, an embodiment of a lighting device according to the present invention will be described in detail with reference to the drawings.

  In FIG. 1, the lamp lighting device 3 is connected to a current transformer 1 provided for each lamp 2 and functions as a terminal controller. The current transformer 1 has a primary side connected to a constant current power supply device 10 that is an AC power source, and a power source circuit 7, a first current detection circuit 61, and a second current detection circuit 62 are connected in series on the secondary side. The closed circuit which connected the lamp 2 via is formed. Then, the lamp 2 is turned on by the current supplied by the closed circuit.

  The power supply circuit 7 acquires a power supply output of a necessary DC voltage by the secondary current (AC) of the current transformer 1, a first current detection circuit 61, a second current detection circuit 62, and an arithmetic processing circuit 4 described later. A constant DC voltage is output to a power supply destination such as the transmission control circuit 8. This DC voltage output is kept constant even if the secondary current of the current transformer 1 changes.

  A bypass circuit 51 is connected to the lamp 2 in parallel via the second current detection circuit 62. The bypass circuit 51 is formed by connecting a normally open contact (hereinafter simply referred to as a contact) 5a of an electromagnetic relay 5 and an AC switching element (for example, a triac) 30 in series. Opens and closes when turned off.

  The first current detection circuit 61 can detect the current flowing through the bypass circuit 51 when the lamp 2 is disconnected. The second current detection circuit 62 detects a current flowing through the lamp 2.

  The arithmetic processing circuit 4 inputs detection values from the first current detection circuit 61 and the second current detection circuit 62, and turns on the electromagnetic relay 5 and the switching element 30 based on these values under preset conditions.・ Control off.

  The transmission control circuit 8 notifies the external device 9 such as a central monitoring device via the communication medium 20 of the calculation result by the arithmetic processing circuit 4, for example, information such as occurrence of disconnection and restoration of disconnection as will be described later.

  In the above configuration, when the lamp 2 is normal, the contact 5a of the bypass circuit 51 is open. When disconnection occurs in the lamp 2, the current that has been flowing through the lamp 2 is interrupted, and the second current detection circuit 62 detects this. The detection result is input to the arithmetic processing circuit 4, and the arithmetic processing circuit 4 closes the bypass circuit 51 based on the information. That is, the electromagnetic relay 5 is excited to close the contact 5a, and the switching element 30 is controlled to be on.

  By this operation, both ends of the lamp 2 are short-circuited to prevent generation of a high voltage. Further, the transmission control circuit 8 and the communication medium 20 are used to notify the external device 9 installed in the monitoring room or the like of the occurrence of disconnection. At this time, by adding individual address information given to the terminal controller (lighting control device) 3 in advance, the external device 9 can specify the position where the disconnection occurs. Therefore, the maintenance staff can go to the location where the disconnection occurs and can safely replace the disconnected lamp 2 with a healthy lamp 2.

  Here, when the bypass circuit 51 is closed and a current flows through the switching element 30, a weak forward voltage is generated at both ends of the switching element 30. That is, when the bypass circuit 51 is closed by disconnection of the lamp 2, a weak terminal voltage (thick hatched line) as shown in FIG. By monitoring the state of the current flowing through the lamp 2 based on this terminal voltage, it is possible to detect that the lamp 2 has been safely replaced without generating a high voltage.

  The arithmetic processing circuit 4 opens the bypass circuit 51 when the lamp 2 is normally lit, but when the second current detection means 62 detects the disconnection of the lamp 2, the bypass circuit 51 is closed as described above. Let For this reason, the weak voltage generated at both ends of the switching element 30 in the on state is applied to both ends of the lamp 2. Since this voltage is literally weak, it can be safely implemented without affecting the lamp replacement work. After the lamp 2 is replaced, a minute current flows through the replaced healthy lamp 2 based on the weak voltage, and the minute current is detected by the second current detection circuit 62. The arithmetic processing circuit 4 inputs this minute current value, and if the value is greater than or equal to the predetermined value, the arithmetic processing circuit 4 determines that the lamp 2 has been restored and opens the bypass circuit 51.

  As described above, when the lamp 2 is disconnected, when a maintenance person tries to replace the lamp 2 in an energized state, only a weak voltage generated at both ends of the switching element 30 is generated at both ends of the lamp 2. The safety of maintenance personnel is ensured. In addition, since it is possible to detect in real time that the lamp 2 has been replaced by the second current detection circuit 62, it is possible to supply current to the lamp 2 with the contact 5a of the bypass circuit 51 open as appropriate. Become. For this reason, it is possible to complete the restoration confirmation work on the spot without performing exchange with the monitoring room by wireless communication or the like, and the work efficiency of the maintenance staff is improved.

  When the rated power of the lamp 2 is large, or when the lamps 2 are connected in series, etc., if the impedance between the terminals 3a and 3b is large, no current flows through the lamp 2 at a weak voltage, and the output current state There is a case that cannot be monitored. In that case, the arithmetic processing circuit 4 inputs a current flowing through the bypass circuit 51 detected by the first current detection circuit 61, and turns off the switching element 30 in the on state for a predetermined period at each zero cross timing of the current. Let

  That is, the zero cross timing is determined for each half wave from the current signal input from the first current detection circuit 61, and the switching element 30 is controlled to be off only during a certain current level (± If) shown in FIG. The current between them is output to the lamp 2. FIG. 3 shows this operation state, where (a) is an input AC current waveform, (b) is a control command to the switching element 30, and (c) is an output current waveform to the lamp 2.

  In FIG. 3, the switching element 30 is controlled to be off within the current level ± If based on the zero cross timing of the input AC current. This control command (b) is adjusted to a predetermined time width by changing the current level ± If in proportion to the impedance of the lamp 2. That is, the arithmetic processing circuit 4 inputs the detection result of the second current detection circuit 62 when the bypass circuit 51 is closed, and sets the OFF period of the switching element 30 if the magnitude of the detection current is equal to or less than a predetermined value. Increase.

  As shown in the control command waveform of FIG. 3B, the switching element 30 is turned on when the logic is “1” and turned off when the logic is “0”. As shown in FIG. 3C, the output current to the lamp 2 is bypassed while the switching element 30 is turned on every half cycle of the input AC current, and the lamp 2 is switched only while the switching element 30 is turned off. Is output. Therefore, when the impedance between the terminals 3a and 3b is large and the detection current of the second current detection circuit 62 is not more than a predetermined value, the OFF time of the switching element 30 is lengthened. On the contrary, when the impedance is small, the output current to the lamp 2 can be adjusted by shortening the OFF time of the switching element 30 or by always turning it ON.

  As a result, even when the impedance between the terminals 3a and 3b is different, it is possible to monitor the output current state and detect that the lamp 2 has been safely replaced without generating a high voltage.

  In addition, when the lamp 2 is replaced in the energized state, it is assumed that chattering as shown in part a of FIG. 4 is involved. If the arithmetic processing circuit 4 opens the contact 5a of the bypass circuit 51 based on the information at the initial stage of the part a of FIG. 4, chattering with a high voltage occurs between 3a and 3b. Accompany.

  Therefore, the safety of maintenance personnel is maintained by maintaining the contact 5a of the bypass circuit 51 in a short-circuited state until the arithmetic processing circuit 4 stabilizes the output of the second current detection circuit 62 for a predetermined time or more set to an appropriate value in advance. Can be secured. That is, the arithmetic processing circuit 4 determines that the lamp is restored on the condition that the minute current value detected by the second current detection circuit 62 is equal to or greater than the predetermined value and continues for the predetermined time.

  In FIG. 4, since no current flows through the lamp 2 during disconnection, this is determined by monitoring the output of the second current detection circuit 62 by the arithmetic processing circuit 4, and the bypass circuit 51 is closed and short-circuited. Keep in state. During this time, since only a weak voltage generated at both ends of the switching element 30 is generated between the terminals 3a and 3b, the safety of maintenance personnel is ensured.

  Next, during the replacement work, the connection state of the lamp 2 is not stable, and the output of the second current detection circuit 62 is detected as an unstable state as indicated by a in FIG. At this time, since the stable state is not continued, the bypass circuit 51 maintains the short circuit state as described above. Also during this period, since only a weak voltage at both ends of the AC switching element 30 is generated, the safety of maintenance personnel during replacement work is ensured.

  Next, the arithmetic processing circuit 4 keeps the output of the second current detection circuit 62 at a predetermined value for a time Δt appropriately set in advance, and confirms that this output is stable, while bypassing it. The circuit 51 is kept in a short circuit state. Also during this period, since only a weak voltage is generated at both ends of the switching element 30, the safety of maintenance personnel during replacement work is ensured.

  Further, when the arithmetic processing circuit 4 confirms that the output of the second current detection circuit 62 maintains a predetermined value for a time Δt that is appropriately set in advance and is stable, the operation circuit 4 contacts the bypass circuit 51. The lamp 2 is turned on with the 5a opened. At this time, since the secondary side of the current transformer 1 has already been short-circuited by the lamp 2, no high voltage is generated, and the safety of maintenance personnel during replacement work is ensured.

  As described above, even when maintenance personnel try to replace the lamp 2 in the energized state, only a weak voltage or a limited voltage generated at both ends of the AC switching element 30 is generated at both ends of the lamp 2. Therefore, the safety of maintenance personnel is ensured, and the second current detection circuit 62 can detect in real time that the lamp 2 has been replaced. For this reason, it becomes possible to supply the current to the lamp 2 with the bypass circuit 51 in an open state as appropriate, and the work for confirming the restoration can be completed on the spot without performing communication with the monitoring room by wireless communication or the like. The work efficiency of maintenance personnel is improved.

  In the above description, when the appropriately set time Δt has elapsed, the bypass circuit 51 is mechanically opened, and the power supply voltage is applied to the lamp 2. At this time, for example, when a maintenance person tries to remove the lamp 2 or when a new disconnection occurs, the terminal controller 3 closes the contact 5a of the bypass circuit 51 to make the safety of the maintenance person safe. However, there is a possibility that a high voltage may be instantaneously generated from the limit of the response speed.

  Therefore, the arithmetic processing circuit 4 detects that the lamp has been exchanged based on the detection output of the second current detection circuit 62, and when it is determined that the lamp has been restored, the arithmetic circuit 4 does not immediately open the bypass circuit 51, but restores the lamp. While notifying the external device 9 by the transmission control circuit 8, the bypass circuit 51 may be opened by an open command from the external device 9.

  That is, after detecting that the lamp 2 has been replaced, the bypass circuit 51 is not opened according to the judgment of the arithmetic processing circuit 4, but is notified to the external device 9 such as a monitoring room. The bypass circuit 51 is opened according to a command from, and the safety of maintenance personnel is ensured.

  Thus, the arithmetic processing circuit 4 is installed in a monitoring room or the like via the transmission control circuit 8 and the communication medium 20 while keeping the bypass circuit 51 in a short-circuited state when detecting that the lamp 2 has been replaced. The external device 9 is notified that the lamp 2 has been replaced. During this time, only a weak voltage generated at both ends of the switching element 30 or a limited voltage is generated, so that safety of maintenance personnel during replacement work is ensured.

  Maintenance personnel during the lamp replacement work ensure their own safety, and notify the maintenance staff themselves during the lamp replacement work or the maintenance staff in the monitoring room or the like by wireless communication or the like. As a result, a signal is sent from the external device 9 via the communication medium 20 and the transmission control circuit 8 so as to open the contact 5a of the bypass circuit 51 of the corresponding terminal controller 3, and the bypass circuit 51 of the terminal controller 3 Is opened.

  Here, conventionally, in order to ensure the safety of maintenance personnel, the constant current power supply device 10 was set in a power failure state and the lamp was replaced, but in this method, the same constant current power supply device 10 was connected. Since all the lights in the closed circuit are extinguished, the operation of the airport is greatly restricted by regulations. However, as described above, it is possible to ensure safety for each individual terminal controller. For this reason, it is possible to carry out a lamp replacement operation without turning off other normal lamps, and it is possible to improve the efficiency of the operation as well as the operation efficiency of the airport.

  As described above, in any of the above-described embodiments, the safety of the maintenance personnel for the lamp replacement work can be ensured, and it can greatly contribute to the improvement of the maintenance work efficiency and the response to the 24-hour operation of the airport.

It is a circuit diagram which shows one Embodiment of the lamp lighting device by this invention. It is a wave form diagram which shows the relationship between the electric current which flows into a bypass circuit at the time of disconnection of a lamp in one Embodiment same as the above, and the voltage applied between the output terminals to a lamp based on this electric current. The waveform diagram which shows the relationship between the electric current which flows into a bypass circuit in one Embodiment same as the above, the ON / OFF control command to the switching element which flows into a bypass circuit, and the output current to the lamp accompanying the ON / OFF operation | movement of this switching element It is. It is a timing chart explaining embodiment which waits for the stable time after the lighting work of this invention, and performs the output to dropping. It is a lighting circuit diagram of a general aerial light.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Current transformer 2 Light 3 Light lighting device 4 Arithmetic processing circuit 5a Contact 9 External device 10 AC power supply 30 AC switching element 51 Bypass circuit 61 1st current detection circuit 62 2nd current detection circuit

Claims (5)

An alternating current power source is connected to the primary side of the current transformer, a closed circuit is formed on the secondary side to which a lamp is connected, and the lamp lighting device for lighting the lamp by the current supplied by the closed circuit,
A bypass circuit having an AC switching element and connected in parallel to the lamp and capable of opening and closing;
A first current detection circuit capable of detecting a current flowing through the bypass circuit and a second current detection circuit capable of detecting a current flowing through the lamp;
When the lamp is normally lit, the bypass circuit is opened, and when the second current detection means detects the disconnection of the lamp, the bypass circuit is closed, and a weak voltage generated at both ends of the switching element in the on state. Is applied to both ends of the lamp, and based on this weak voltage, the second current detection circuit detects a minute current flowing through the replaced healthy lamp, and if the value is greater than or equal to a predetermined value, it is determined that the lamp is restored. And an arithmetic processing circuit for opening the bypass circuit;
A lighting device characterized by comprising: An alternating current power source is connected to the primary side of the current transformer, a closed circuit is formed on the secondary side to which a lamp is connected, and the lamp lighting device for lighting the lamp by the current supplied by the closed circuit,
A bypass circuit having an AC switching element and connected in parallel to the lamp and capable of opening and closing;
A first current detection circuit capable of detecting a current flowing through the bypass circuit and a second current detection circuit capable of detecting a current flowing through the lamp;
When the lamp is normally lit, the bypass circuit is opened, and when the second current detection means detects the disconnection of the lamp, the bypass circuit is closed, and a weak voltage generated at both ends of the switching element in the on state. Is applied to both ends of the lamp, and based on this weak voltage, the second current detection circuit detects a minute current flowing through the replaced healthy lamp, and if the value is greater than or equal to a predetermined value, it is determined that the lamp is restored. And an arithmetic processing circuit for notifying the external device of the light recovery and opening the bypass circuit by an open command from the external device;
A lighting device characterized by comprising:   The arithmetic processing circuit inputs a detection current of the first current detection circuit when the bypass circuit is closed, and turns off the switching element in the on state for a predetermined period at each zero cross timing. Item 3. A lamp lighting device according to Item 2.   The arithmetic processing circuit inputs the detection result of the second current detection circuit when the bypass circuit is closed, and increases the OFF period of the switching element if the magnitude of the detection current is a predetermined value or less. The lamp lighting device according to claim 3.   The arithmetic processing circuit determines that the lamp is restored on condition that the minute current value detected by the second current detection circuit is equal to or more than a predetermined value and continues for a predetermined time or more. The lighting device described in 1.

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