JPH11111472A - Lamp filament disconnection detecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect the filament disconnection of a lamp not by visual observation. SOLUTION: An overvoltage protection circuit 3 protects a lamp filament disconnection detecting device 30 from a high voltage generated through a current transformer 1 secondary side opening resulting from a lamp 2 filament disconnection by arrester II discharge. An overvoltage detection circuit 4 detects whether a predetermined level voltage defined by a constant voltage diode 12 Zener voltage is generated or not. A bypass relay 5 causes a current to bypass at a lamp 2 pre-stage. A transmission control circuit 8 transmits information to an external device 7 connected through a transmission path 6. A processing circuit 9 controls the relay and the respective circuits.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting device disconnection detecting device for detecting the disconnection of a lighting device such as a guide light installed on an airport runway or taxiway.

[0002]

2. Description of the Related Art For example, guide lights and control lights for guiding an aircraft are lit on a runway or taxiway at an airport.

FIG. 7 shows a part of the above-mentioned conventional aircraft guidance and monitoring system, in which the primary sides of a plurality of current transformers 1 are connected in series to a constant current power supply 17 to form a closed circuit. Only one lighting device 2 is connected to the secondary side of the current transformer 1, or a plurality of lighting devices 2 are connected in series to the secondary side of the current transformer 1. When the lighting devices 2 are connected in series, the film cutouts 14 that short-circuit when a high voltage is applied in parallel with the individual lighting devices 2 are connected.

When only one lighting device 2 is connected to the secondary side of the current transformer 1 and the lighting device 2 is disconnected, the disconnected lighting device 2 is turned off and connected. The secondary side of the current transformer 1 is opened, and a high voltage is generated. Further, if the lighting device 2 is disconnected when a plurality of lighting devices 2 are connected in series to the secondary side of the current transformer 1, the secondary side of the current transformer 1 opens to generate a high voltage, This high voltage is applied to the film cutout 14 connected in parallel with the fired lamp 2 and short-circuited, bypassing the current supplied from the secondary side of the current transformer 1 and cutting off the core. The current from the secondary side of the current transformer 1 was supplied to the other lighting devices 2 to keep the lighting state.

[0005]

However, according to the prior art described above, there is no other way but to visually detect that the lighting device 2 does not light up when the lighting device 2 is disconnected, and it is installed at an airport or the like. In order to find a broken lamp 2 out of a huge number of lamps 2, it is necessary to go to all the lamps 2 and check the lamps 2 one by one. There is a problem that it takes an excessive amount of time and effort to find the cored lighting device 2.

Moreover, since it is not known when the lighting device 2 will be cut off, the act of finding the broken lighting device 2 must be performed at predetermined intervals. In addition, there is a problem that the reliability cannot be ensured, such as a delay in discovery by visual observation.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a lighting device disconnection detecting device which detects the disconnection of a lighting device without human intervention and performs highly reliable detection.

[0008]

According to a first aspect of the present invention, there is provided a closed circuit in which a current source is connected to a primary side of a current transformer, and a lighting device is connected to a secondary side of the current transformer. A lighting closed circuit for lighting the lamp by a current supplied by a closed circuit, and a current supplied to the lighting closed circuit while detecting a disconnection of a light emitting portion of the lamp from an abnormal voltage state of the lighting closed circuit. And a detection circuit provided at a stage preceding the lighting closed circuit, which has a self-power supply, wherein the light emitting unit of the lighting device is disconnected and the lighting closed circuit is opened. An overvoltage protection circuit that absorbs a high voltage generated in the lighting closed circuit with an arrester and maintains the overvoltage protection level, and a voltage corresponding to the overvoltage protection level maintained by the overvoltage protection circuit and the zener voltage of the constant voltage diode. Based on overcharge An overvoltage detecting circuit for detecting the status,
A bypass relay that forms a bypass circuit at a stage preceding the lighting closed circuit when the lighting closed circuit is opened, to secure a self-power supply of the detection circuit; and a lamp based on an overvoltage state detected by the overvoltage detection circuit. An arithmetic processing circuit that controls the bypass relay while outputting the determination information to the outside via a transmission control circuit and determining the disconnection of the device is provided. According to this means, when the lighting device is disconnected and the lighting closed circuit is opened, a high voltage is generated in the lighting closed circuit. This high voltage is maintained at the overvoltage protection level by the overvoltage protection circuit. At this time, an overvoltage state is detected based on the overvoltage protection level and the zener voltage of the constant voltage diode. Thus, the disconnection of the lighting device is determined according to the overvoltage state and is notified to the outside. On the other hand, a bypass circuit is formed by the bypass relay to secure the self-power supply. As described above, in this means, the constant voltage diode is used for detecting the overvoltage state, and if the type of the zener voltage of the constant voltage diode is selected, the magnitude of the overvoltage state level can be changed, and the lighting closed circuit In accordance with the overvoltage protection level occurring at the time. Therefore, it is possible to manufacture an overvoltage detection circuit with ease and reliability. In addition, it is possible to accurately detect the decentering, and it is possible to reduce the conventional excessive labor and time without requiring any manual operation.

According to a second aspect of the present invention, in the lighting device disconnection detecting apparatus according to the first aspect, the arithmetic processing circuit operates the bypass relay for a predetermined time according to an overvoltage state detected by the overvoltage detection circuit. In addition, when the overvoltage state is detected again after the predetermined time, a process of determining the disconnection of the lighting device is performed. According to this means, the disconnection is determined when the overvoltage state is detected again after the bypass relay has been operated for a predetermined time, so that erroneous determination of a transient voltage abnormality such as noise can be avoided, and an accurate disconnection can be prevented. You can judge the core.

According to a third aspect of the present invention, in the lighting device disconnection detecting apparatus according to the first aspect, a bypass circuit for bypassing in parallel with the lighting closed circuit is formed at a stage prior to the lighting closed circuit, A dimmer for shunting the lighting current supplied to the lighting device to adjust the lighting state of the lighting device, and periodically interrupting the current flowing to the bypass circuit for a short time to apply a high voltage to the lighting closed circuit. Then, the overvoltage detection circuit can detect the overvoltage state. According to this means, the lighting state of the lighting device can be changed from off to on by controlling the dimming circuit. When the lighting device is off, a bypass circuit is formed before the lighting closed circuit. In this case, the current flowing to the bypass circuit is periodically interrupted for a short period of time, and the interrupted current flows to the lighting closed circuit. If the core is disconnected, a high voltage is generated in the lighting closed circuit. Thus, a dimming circuit is provided, and the disconnection can be detected even when the light is turned off.

According to a fourth aspect of the present invention, a current circuit is connected to the primary side of the current transformer, and a closed circuit is formed by connecting a lighting device to the secondary side of the current transformer, and the closed circuit is supplied by the closed circuit. A lighting closed circuit for lighting the lamp by current, and detecting a disconnection of a light emitting portion of the lighting device from an abnormal voltage state of the lighting closed circuit, and using a current supplied to the lighting closed circuit as a self-power source. A lighting circuit disconnection detection device comprising a detection circuit provided at a stage preceding the lighting closed circuit, wherein the lighting closed circuit includes:
A plurality of lighting devices are connected in series, and a short-circuit member that short-circuits when a high voltage is applied to each of the lighting devices is connected in parallel, while the detection circuit is configured such that a light-emitting portion of the lighting device is disconnected. An overvoltage protection circuit that absorbs a high voltage generated in the lighting closed circuit due to the opening of the lighting closed circuit with an arrester and maintains the overvoltage protection level; and an overvoltage protection level maintained by the overvoltage protection circuit. And an overvoltage detection circuit for detecting an overvoltage state based on a voltage corresponding to the Zener voltage of the constant voltage diode, and a detection circuit formed by forming a bypass circuit in front of the lighting closed circuit when the lighting closed circuit is opened. And a bypass relay that secures its own power supply, and determines the disconnection of the lighting device based on the overvoltage state detected by the overvoltage detection circuit, and transmits the determination information via a transmission control circuit. While outputting the parts, is released after said bypass relay operation is obtained by the provided and an arithmetic processing circuit for the control of shorting the short-circuiting member. According to this means, when any one of the plurality of lighting devices is disconnected, the lighting closed circuit becomes the overvoltage protection level, the overvoltage state is detected, and the disconnection is determined. In this case, the operation of the bypass relay and the release of the operation are performed, and the short-circuit member is short-circuited to form a lighting closed circuit. This makes it possible to determine the centering and to light a lamp that does not have the centering.

According to a fifth aspect of the present invention, in the lighting device disconnection detecting device according to the fourth aspect, the arithmetic processing circuit determines disconnection based on an overvoltage state detected by an overvoltage detecting circuit, and disconnects the bypass relay. Means is provided for activating the bypass relay for a predetermined time and ending the operation after the overvoltage state is not detected by repeating the operation release of the bypass relay. According to this means, the operation and release of the bypass relay are repeatedly performed until the overvoltage state is not detected, so that the short-circuit member can be reliably short-circuited to form a closed circuit, and the lamp that is not disconnected can be turned on. .

According to a sixth aspect of the present invention, in the lighting device disconnection detecting device according to the fourth aspect, the arithmetic processing circuit determines disconnection based on an overvoltage state detected by the overvoltage detecting circuit, and the bypass relay. The operation release of the operation is repeated, and these operations are repeated a predetermined number of times.When the overvoltage state is not detected within the predetermined number of times, the bypass relay is released and terminated.When the overvoltage state is detected after the predetermined number of times, the bypass relay operation is held. In this case, means for ending the process is provided. According to this means, when it takes a long time to terminate and short-circuit after performing the operation and release of the bypass relay a predetermined number of times, it is possible to avoid an influence on the primary side of the current transformer.

According to a seventh aspect of the present invention, in the lighting device disconnection detecting device according to the fourth aspect, the arithmetic processing circuit determines disconnection based on an overvoltage state detected by the overvoltage detecting circuit, and the bypass relay. A predetermined number of operations and cancellations are performed, and after execution, the bypass relay is operated when the overvoltage state is detected, and means for canceling the operation of the bypass relay when the overvoltage state is not detected is provided. is there. According to this means, when the overvoltage state is not detected by repeating the operation and release of the bypass relay a predetermined number of times, the bypass relay can be released and returned, and even if the overvoltage state is detected again, the bypass relay is operated and changed. Protect the power supply on the primary side of the sink.

The invention according to claim 8 is the invention according to claims 4 to 7.
In any of the lighting device disconnection detection devices according to the above, a bypass circuit is formed in parallel with the lighting closed circuit at a stage preceding the lighting closed circuit, and a current supplied to the lighting closed circuit is divided into a bypass circuit. A dimmer for adjusting the lighting state of the lamp is provided, and the arithmetic processing circuit shunts the diversion to the bypass circuit by the dimmer when determining the disconnection based on the overvoltage state detected by the overvoltage detection circuit. Means for stopping the operation is provided. According to this means, when any one of the plurality of lighting devices is disconnected, the control of the dimming circuit is stopped, and the operation and release of the bypass relay are performed, so that the short-circuit member is easily short-circuited. Therefore, it is possible to light a lamp which is returned to an early stage and which does not lose its core.

The invention of claim 9 is the invention of claims 4 to 8
In any one of the lighting device disconnection detection devices according to the above, the arithmetic processing circuit enables the overvoltage protection level of the overvoltage protection circuit to be switched in multiple stages, and normally sets the overvoltage protection level to a predetermined state, A means is provided for switching the overvoltage protection level to a state higher than the normal predetermined state when the disconnection is determined based on the overvoltage state. According to this means, when any of the plurality of lighting devices is disconnected and the disconnection is determined, the control of the light control circuit is stopped, and the overvoltage protection level is set to a higher level than before the disconnection. Then, the high overvoltage protection level is applied to the short-circuit member, and the operation and release of the bypass relay are repeated. Thus, the short-circuit member can be reliably short-circuited and restored.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of a lighting device disconnection detecting device according to a first embodiment of the present invention.

In the lighting device disconnection detecting device 30, the secondary side 1b of the current transformer 1 is connected to the terminals 18a and 18b on the power supply side, the terminals 18c and 18d on the detecting side are connected to the lighting device 2, and the transmission side. The external device 7 is connected to the terminal 18e of the current transformer 1 via the transmission line 6, and the constant current power supply 17 is connected to the primary side 1a of the current transformer 1.

The lighting device disconnection detecting device 30 includes a line 19 connecting the terminals 18a and 18c, a terminal 18b and a terminal 18b.
A lighting closed circuit is formed by the line 20 connecting to the lighting device 2 and the lighting device 2, an overvoltage protection circuit 3 having an arrester 11 is connected in front of the lighting closed circuit, and an overvoltage detection circuit is further connected to a constant voltage diode 12. 4 are provided.

Further, a connection line is connected to the line 19 and the line 20 via the bypass relay contact 5a,
Has a power supply circuit 10. The output side of the overvoltage detection circuit 4 is connected to an arithmetic processing circuit 9, and the arithmetic processing circuit 9 is connected to the bypass relay 5 having the bypass relay contact 5a, while being connected to the transmission control circuit 8, The circuit 8 is connected to the terminal 18e.

Here, the overvoltage protection circuit 3 activates the luminaire disconnection detecting device 30 by discharging the arrester 11 from the high voltage generated when the secondary side of the current transformer 1 opens due to the disconnection of the lamp 2. Protect. The overvoltage detection circuit 4 detects whether or not a voltage of a predetermined level determined by the zener voltage of the constant voltage diode 12 has been generated. The bypass relay 5 allows a current to be bypassed at a stage prior to the lighting device 2. The transmission control circuit 8 transmits information to the external device 7 connected via the transmission line 6. The arithmetic processing circuit 9 controls the bypass relay 5 and each circuit.

With the above configuration, the current supplied from the secondary side 1b of the current transformer 1 via the terminals 18a and 18b
If the lamp 2 is disconnected while the current is being output from c and 18d to the lamp 2 forming a closed circuit, the secondary side of the current transformer 1 is opened and a high voltage is generated. As a result, the arrester 11 of the overvoltage protection circuit 3 changes the high voltage to the arrester 11.
The discharge is performed at a predetermined overvoltage protection level determined by the discharge start voltage to suppress the high voltage to a predetermined voltage level to protect the lighting device disconnection detection device 30.

The overvoltage detecting circuit 4 detects an overvoltage state when a high voltage generated when the lighting device 2 is disconnected exceeds a predetermined voltage level determined by the zener voltage of the constant voltage diode 12, and performs an arithmetic processing circuit 9. Tell The overvoltage state of the overvoltage detection circuit 4 is detected using a transistor or a photocoupler. The arithmetic processing circuit 9 receives the detection of the overvoltage state and determines that the lighting device 2 has been disconnected, and sets the relay contact to the make state (ON state).
Thereby, the opening of the secondary side of the current transformer 1 due to the disconnection of the lighting device 2 is restored to form the current circuit 10 and the power supply voltage of the lighting device disconnection detecting device 30 is secured.

The arithmetic processing circuit 9 informs the transmission control circuit 8 of the fact that the lighting device 2 has been disconnected, and the lighting device has been disconnected from the transmission control circuit 8 to the external device 7 via the transmission line 6. Communicate that.

As described above, according to the first embodiment, in an aircraft guidance system light for controlling a lighting device such as a guide light and a control light installed on an airport runway, a taxiway, etc., By installing a lighting device disconnection detection device, if the lighting device is disconnected, the disconnection can be detected immediately and the disconnection can be transmitted to an external device via a transmission line, so that the lighting device can be artificially detected. It is possible to find out without visually confirming the disconnection by going to the place, and the time and effort required to find the disconnection can be greatly reduced.

Furthermore, since the disconnection of the lamp can be immediately detected, the replacement of the disconnected lamp can be performed immediately, and the reliability of the system can be improved.

Further, a constant voltage diode is used for detecting the overvoltage state. If the type of the zener voltage of the constant voltage diode is selected, the magnitude of the overvoltage state level can be changed, and the overvoltage generated in the lighting closed circuit can be changed. Depending on the level of protection. Therefore, it is possible to manufacture an overvoltage detection circuit with ease and reliability. In addition, accurate detection of decentering can be performed.

The first embodiment can be implemented as the second embodiment as follows.

The second embodiment has the same configuration as that of FIG. 1. The arithmetic processing circuit 9 operates the bypass relay 5 for a predetermined time in accordance with the overvoltage state detected by the overvoltage detection circuit 4, It is characterized in that when the overvoltage state is detected again after a lapse of time, a process of determining the disconnection of the lighting device 2 is performed.

According to this configuration, after the overvoltage state is detected by the overvoltage detection circuit 4, the bypass relay 5 performs the make state and the break state at a predetermined cycle, and the overvoltage detection circuit 4 detects the overvoltage twice consecutively. Only when this is done, it is determined that the lighting device 2 is disconnected, so that erroneous detection due to transient overvoltage due to noise or the like can be prevented.

Next, a third embodiment of the present invention will be described with reference to FIG.

FIG. 2 shows a first embodiment of the present invention.
The same reference numerals denote the same or corresponding parts, and in the third embodiment, a bypass circuit for bypassing in parallel with the lighting closed circuit is formed before the lighting closed circuit, and the bypass circuit is supplied to the lighting device 2. A dimming circuit 13 for shunting the lighting current to adjust the lighting state of the lighting device 2 is provided. The current flowing to the bypass circuit is periodically interrupted for a short time to generate a high voltage. It has a feature that enables detection of a state.

Here, the dimming circuit 13 is connected to the lines 19 and 2
It is connected between 0 and is controlled by the arithmetic processing circuit 9 so that the current between the lines 19 and 20 flows to the dimming circuit 13 and is bypassed to control the current flowing to the lighting device 2.

The arithmetic processing circuit 9 judges the disconnection of the lighting device 2 based on the overvoltage state detected by the overvoltage detection circuit 4 and outputs the judgment information to the external device 7 via the transmission control circuit 8. It controls the bypass relay 5.

With this configuration, the current supplied from the secondary side of the current transformer 1 is supplied to the dimming circuit 1 in parallel with the bypass relay 5.
3, the current flowing through the lighting device 2 is controlled. In this case, when the dimming circuit 13 is controlled so that the current flowing through the lighting device 2 is extremely small, at a predetermined cycle,
A command is sent from the arithmetic processing circuit 9 to the dimming circuit 13 so that a predetermined high-level current flows to the lighting closed circuit for a time during which the light emission of the lighting device 2 is not affected to the lighting device 2 side.

At this time, assuming that the lighting device 2 is disconnected, the high-level current flowing for a time that does not affect the light emission of the lighting device 2 causes the secondary side of the current transformer 1 to open. A high voltage is generated, and this high voltage causes the voltage level to exceed a predetermined voltage level state determined by the zener voltage of the constant voltage diode 12 of the overvoltage detection circuit 4. Thus, even when the lighting device 2 is turned off, the disconnection of the lighting device 2 can be detected and transmitted to the external device 7.

As described above, according to the third embodiment, the lighting state of the lighting device can be changed from off to on by controlling the dimming circuit. When the lighting device is off, a bypass circuit is formed before the lighting closed circuit. In this case, the current flowing to the bypass circuit is periodically interrupted for a short period of time, and the interrupted current flows to the lighting closed circuit. If the core is disconnected, a high voltage is generated in the lighting closed circuit. Thus, a dimming circuit is provided, and the disconnection can be detected even when the light is turned off.

Next, a fourth embodiment of the present invention will be described with reference to FIG.

FIG. 3 shows a first embodiment of the present invention.
The same reference numerals denote the same or corresponding portions, and in FIG. 3, two lighting devices 2 are connected in series, and each lighting device 2 is connected.
The film cutout 14 is connected in parallel, and the fourth embodiment detects that one of the lighting devices 2 has become disconnected, while enabling the lighting device 2 that is not disconnected to be turned on. It is.

Here, the arithmetic processing circuit 9 forms a bypass circuit at a stage preceding the lighting closed circuit when the lighting closed circuit is opened, and secures a self-power supply of the detecting circuit.
And determining the disconnection of the lighting device 2 based on the overvoltage state detected by the overvoltage detection circuit 4 and outputting the determination information to the outside via the transmission control circuit 8 while controlling the bypass relay 5. . The film cutout 14 exerts a short circuit action when a high voltage is applied as a short circuit member.

In this configuration, two lamps 2 are connected in series, and when a high voltage is applied, the film cutouts 14 that are short-circuited are individually connected in parallel with the lamps 2. In this case, when one of the two lamps 2 is disconnected, the overvoltage detection circuit 4 exceeds the predetermined voltage level between the overvoltage protection level generated in the lighting closed circuit and the zener voltage of the constant voltage diode 12, and the overvoltage occurs. State, and the occurrence of the overvoltage state is transmitted to the arithmetic processing circuit 9.

As a result, the arithmetic processing circuit 9 determines that one of the lamps 2 has become disconnected, and makes the bypass relay 5 to make (ON state) and break (OFF state) at a predetermined cycle.
Are alternately controlled. When the relay 5 is turned on, the current supplied from the secondary side of the current transformer 1 is bypassed at the contact point of the bypass relay 5 to secure the power supply of the lamp disconnection detecting device 30.

A high voltage generated by opening the secondary side of the current transformer 1 when the bypass relay 5 is broken is applied to the film cutout 14 as an overvoltage protection level discharged by the arrester 11 of the overvoltage protection circuit 3. You. The film cutout 14 connected to the lighting device 2 whose core has been disconnected by the make and break operations of the bypass relay 5 performs a short circuit operation to bypass the current. As a result, it is detected that the disconnection has occurred in any of the two lighting devices 2, and it is possible to maintain the lighting state of the lighting devices other than the disconnected lighting device.

As described above, according to the fourth embodiment, when any one of the plurality of lighting devices is disconnected, the lighting closed circuit becomes the overvoltage protection level, the overvoltage state is detected, and the disconnection is determined. In this case, the operation of the bypass relay and the release of the operation are performed, and a short-circuit member is formed to form a lighting closed circuit.
This makes it possible to determine the centering and to light a lamp that does not have the centering.

The fourth embodiment can be implemented as a fifth embodiment as follows.

The fifth embodiment is the same as the configuration shown in FIG. 3 except that the arithmetic processing circuit 9 detects an overvoltage and repeats the make and break states of the bypass relay 5 and thereafter detects the overvoltage state. It is done until it runs out.

With this configuration, when one of the two lighting devices 2 is disconnected, the overvoltage protection level is changed to the constant voltage diode 12.
It is assumed that an overvoltage state has occurred when the voltage exceeds a predetermined voltage level determined by the Zener voltage of. The arithmetic processing circuit 9 controls the bypass relay 5 to alternately make and break at a predetermined cycle.

At this time, when the bypass relay 5 is closed, the current supplied from the secondary side of the current transformer 1 is bypassed at the bypass relay contact 5 a of the bypass relay 5, so that the power supply of the lighting device disconnection detecting device 30 is controlled. Secure. When the bypass relay 5 breaks, the voltage is applied to the film cutout 14 connected to the lighting device 2 that has been disconnected. This operation is repeated until the overvoltage detection circuit 4 no longer detects the overvoltage state. As a result, the film cutout 14 connected to the lighted lamp 2 is short-circuited to form a closed lighting circuit.

As described above, according to the fifth embodiment, the operation and release of the bypass relay are repeatedly performed until the overvoltage state is not detected, so that the short-circuit member is reliably short-circuited to form a closed circuit, and the disconnection is performed. Lights that are not cored can be turned on.

Note that the fourth embodiment can be implemented as the sixth embodiment as follows.

The sixth embodiment has the same configuration as that shown in FIG. 3, and the arithmetic processing circuit 9 detects the overvoltage state and executes the make-up state and the break state a predetermined number of times. Is held, and the bypass relay 5 is released when the overvoltage state is not detected within a predetermined number of times.

With this configuration, the arithmetic processing circuit 9 controls the bypass relay 5 alternately and repeatedly with make and break at a predetermined cycle. At this time, when the bypass relay 5 is made, the current supplied from the secondary side of the current transformer 1 is bypassed at the bypass relay contact 5a of the bypass relay 5 to secure the power supply of the lighting device disconnection detecting device 30. Also, when the bypass relay 5 breaks, the voltage is applied to the film cutout 14 connected to the lighting device 2 that has been disconnected. This operation is repeated, and after a predetermined number of times, the bypass relay 5
And make.

As described above, according to the sixth embodiment, when it takes a long time to terminate and short-circuit after performing the operation and release of the bypass relay a predetermined number of times, the influence on the primary side of the current transformer is reduced. Can be avoided.

The fourth embodiment can be implemented as the seventh embodiment as follows.

This sixth embodiment has the same configuration as that shown in FIG. 3, and the arithmetic processing circuit 9 determines the disconnection based on the overvoltage state detected by the overvoltage detection circuit 4, while
The operation and release of the bypass relay 5 are executed a predetermined number of times,
It is characterized in that the bypass relay 5 is operated when an overvoltage state is detected after execution, and the operation of the bypass relay 5 is canceled when an overvoltage state is not detected.

In this configuration, the arithmetic processing circuit 9 controls the bypass relay 5 alternately between a make state and a break state at a predetermined cycle. In this case, when the bypass relay 5 is made, the current supplied from the secondary side of the current transformer 1 is bypassed at the contact point of the bypass relay 5 to secure the power supply of the lighting device disconnection detecting device.

When the bypass relay 5 breaks, the film cutout 14 connected to the lighting device 2 that has become disconnected
Is applied. This operation is alternately repeated and performed unconditionally up to a predetermined number of times. When the overcut detection circuit 4 detects an overvoltage condition without the short circuit operation of the film cutout 14 connected to the fired lighting device 2 even if the predetermined number of times has been performed, the bypass relay 5 is set to the make state and the bypass relay is set. 5 is short-circuited to bypass the current.

As described above, according to the seventh embodiment, when the over-voltage state is not detected by repeating the operation and release of the bypass relay a predetermined number of times, the bypass relay can be released and returned, and the over-voltage state is detected again. Activate the bypass relay to protect the power supply on the primary side of the current transformer.

Next, an eighth embodiment of the present invention will be described with reference to FIG.

FIG. 4 shows a fourth embodiment of the present invention.
4 denote the same or corresponding parts, and FIG.
3 is applicable to the case where the dimming circuit 13 is provided in FIG. 3. When the arithmetic processing circuit 9 determines the disconnection based on the overvoltage state detected by the overvoltage detecting circuit 4, the dimming is performed. It is characterized in that the shunt to the bypass circuit by the optical circuit 13 is stopped.

In this configuration, the current supplied from the secondary side of the current transformer 1 is bypass-controlled by the dimming circuit 13 in parallel with the bypass relay 5, and the current flowing to the lamp 2 is controlled. At this time, when the current flowing through the two lighting devices 2 is low,
When any one of the lamps 2 is disconnected, the arithmetic processing circuit 9 receives from the overvoltage detection circuit 4 information on the detection of the current that flows when the arrester 11 of the overvoltage protection circuit 3 is discharged.

Next, the dimming circuit 13 from the arithmetic processing circuit 9
Is stopped so that all the current from the secondary side of the current transformer 1 flows to the lamp 2. As a result, the voltage generated when the secondary side of the current transformer 1 is open is increased to operate and release the bypass relay 5. Thereby, the short-circuit operation of the film cutout 14 connected to the lighted lamp 2 can be easily performed.

Note that the eighth embodiment can be implemented as follows.

The other embodiment is a combination of the eighth embodiment shown in FIG. 4 with the fifth embodiment, and the arithmetic processing circuit 9 is provided with an overvoltage state detected by the overvoltage detection circuit 4. This is characterized in that while the disconnection is determined, the bypass relay 5 is operated, and the operation of the bypass relay 5 is repeated, and the operation is terminated after the overvoltage state is not detected.

When an overvoltage condition is detected, the arithmetic processing circuit 9 stops the control of the dimming circuit 13 so that all the current from the secondary side of the current transformer 1 flows to the lighting device 2, Vessel 1
The voltage generated due to the open state of the secondary side is increased, and the arithmetic processing circuit 9 alternately controls the bypass relay 5 between the make state and the break state at a predetermined cycle. At this time, when the bypass relay 5 is made, the current supplied from the secondary side of the current transformer 1 is bypassed at the contact point of the bypass relay 5 to secure the power source of the lighting device disconnection detecting device.

When the bypass relay 5 is broken, the voltage is applied to the film cutout 14 connected to the lighting device 2 whose core has been disconnected. This is alternately repeated until the overvoltage detection circuit 4 stops detecting the overvoltage until a predetermined number of times. According to this other embodiment, since the film cutout 14 is short-circuited and the overvoltage state ends after no detection, it is possible to reliably light a lamp that is not disconnected.

The eighth embodiment can be implemented as follows. In this other embodiment, the sixth embodiment is combined with the eighth embodiment shown in FIG. 4, and the arithmetic processing circuit 9 is disconnected by an overvoltage state detected by the overvoltage detection circuit 4. On the other hand, the bypass relay 5 is operated for a predetermined period of time, and the operation of releasing the bypass relay 5 is repeated. After repeating these operations a predetermined number of times, when the overvoltage state is detected, the bypass relay 5 is operated and held. If the overvoltage state is not detected even within the predetermined number of times, the bypass relay 5 is released and the process is terminated.

As described above, if the overvoltage detection circuit 4 detects an overvoltage without performing the short circuit operation of the film cutout 14 connected to the fired lighting device 2 even after performing the predetermined number of times, the bypass relay 5 is closed. In this state, the contact of the bypass relay 5 is short-circuited, and the current from the secondary side of the current transformer 1 is bypassed inside the lighting device disconnection detecting device.

As a result, when the film cutout 14 connected to the lighted lamp 2 does not short-circuit,
When it takes a long time to perform the short circuit operation, the open state of the secondary side of the current transformer 1 due to the disconnection of the lighting device 2 is restored in a predetermined time, and the influence on the primary side of the current transformer 1 is reduced. The reliability of the system can be improved.

The eighth embodiment can be implemented as follows.

This other embodiment is a combination of the eighth embodiment shown in FIG. 4 with the seventh embodiment, and the arithmetic processing circuit 9 is provided with an overvoltage state detected by the overvoltage detection circuit 4. While the disconnection is determined, the operation and release of the bypass relay 5 are executed a predetermined number of times. After the execution, the bypass relay 5 is operated when an overvoltage state is detected, and the operation is released when the overvoltage state is not detected. It has a feature in that it is performed.

That is, when the bypass relay 5 is broken, the voltage is applied to the film cutout 14 connected to the lighting device 2 whose core has been disconnected. This operation is repeated with each other, and is performed unconditionally up to a predetermined number of times. The film cutout 14 connected to the lighting device 2 that has been cut off even after performing the predetermined number of times.
If the overvoltage detection circuit 4 detects an overvoltage without performing a short circuit operation, the bypass relay 5 is made to be in a make state, the contacts of the bypass relay 5 are short-circuited, and the current transformer 1 Bypass current from the secondary side.

As described above, even if any one of the plurality of lighting devices 2 is disconnected while the current flowing through the plurality of lighting devices 2 is controlled by the dimming circuit 13, the disconnected lighting device Since the voltage applied to the film cutout 14 connected to the power supply 2 can be increased, the short-circuit operation of the film cutout 14 can be easily performed. Can be turned on.

When the film cutout 14 connected to the lighted lamp 2 does not short-circuit or takes a long time to short-circuit, the current cut-off of the current transformer 1 due to the light-off of the lamp 2 is performed. By returning the open state of the secondary side in a predetermined time, the influence on the primary side of the current transformer 1 can be suppressed, and system reliability can be improved.

As described above, according to the eighth embodiment, when any one of the plurality of lighting devices is disconnected, the control of the dimming circuit is stopped, and the operation and release of the bypass relay are performed. Short circuit easily. Therefore, it is possible to light a lamp which is returned to an early stage and which does not lose its core.

Next, a ninth embodiment of the present invention will be described with reference to FIG.

FIG. 5 shows a fourth embodiment of the present invention.
The same reference numerals as those shown in FIG.
The arrestor 11 and the arrester 15 are provided in the overvoltage protection circuit 3 as compared with FIG.

With this configuration, the arrester 11 and the arrester 15
And the arrestor switch the connection by the switching relay 16. That is, in a state where the lighting device 2 is not disconnected, the switching relay 16 is set to the make state and the contact 16a of the switching relay 16 is short-circuited. If any one of the two lighting devices 2 is disconnected and a high voltage is generated due to an open state of the secondary side of the current transformer 1, the high voltage is applied to the arrester 11 of the overvoltage protection circuit 3.
, The arrester 11 discharges at a predetermined voltage level to protect the lighting device disconnection detecting device.

The overvoltage detection circuit 4 informs the arithmetic processing circuit 9 that an overvoltage condition has occurred. The arithmetic processing circuit 9 puts the bypass relay 5 into a make state, and is supplied from the secondary side of the current transformer 1. Supply current to the power supply circuit 10. Then, the contact 16a of the switching relay 16 is set to the break state, the contact 16a of the switching relay 16 is opened, and the arrester 11 is opened.
And the arrester 15 are connected in series.

When the arrester 11 and the arrester 15 are connected in series, the voltage level at which the arrester starts discharging becomes the sum of the voltage level at which the arrester 11 starts discharging and the voltage level at which the arrester 15 starts discharging. The voltage applied to OUT 14 increases. Thereby, short-circuiting of the film cutout 14 can be performed quickly.

The ninth embodiment can be implemented as follows. This other embodiment is a combination of the ninth embodiment shown in FIG. 5 and the fifth embodiment.

That is, the overvoltage detection circuit 4 informs the arithmetic processing circuit 9 when an overvoltage state occurs, and the arithmetic processing circuit 9 puts the bypass relay 5 into a make state to secure power to be supplied to the power supply circuit 10. Then, after the switching relay 16 is set to the break state and the contact 16a of the switching relay 16 is opened to connect the arrester 11 and the arrester 15 in series, the arithmetic processing circuit 9 sets the bypass relay 5 to alternate between make and break at a predetermined cycle. To control.

When the bypass relay 5 is closed, the current supplied from the secondary side of the current transformer 1 is
To secure the power supply of the lamp burnout detector. A lighting device 2 having a predetermined level of voltage discharged when the arrester 11 and the arrester 15 of the overvoltage protection circuit 3 are connected in series when the bypass relay 5 is broken.
To the film cutout 14 connected to. This operation is repeated to short-circuit the film cutout 14 connected to the fired lamp 2 to bypass the current, and the open state of the secondary side of the current transformer 1 returns to generate a high voltage. The operation is performed until the overvoltage detection circuit 4 stops detecting the overvoltage.

As described above, the arrester 1 of the overvoltage protection circuit 3
By switching the connection configuration between 1 and arrester 15,
Since the voltage level at which the overvoltage protection circuit 3 starts discharging can be lowered before detecting the disconnection, and can be increased after the detection of the disconnection, the disconnection of the lighting device 2 is reliably detected and the disconnection is performed. The film cutout 14 connected to the lighting device 2 can be more reliably short-circuited.

The ninth embodiment can be implemented as follows. This other embodiment is a combination of the ninth embodiment shown in FIG. 5 and the sixth embodiment.

The overvoltage detecting circuit 4 informs the arithmetic processing circuit 9 that an overvoltage condition has occurred. Then, the arithmetic processing circuit 9 puts the bypass relay 5 in the make state, supplies the current supplied from the secondary side of the current transformer 1 to the power supply circuit 10, and secures the power supply of the lamp burnout detecting device. Thereafter, the switching relay 16 is set to the break state, and the contact 16
a is opened to connect the arrester 11 and the arrester 15 in series. Then, the arithmetic processing circuit 9 alternately controls the make and break of the bypass relay 5 at a predetermined cycle.
At this time, when the bypass relay 5 is made, the current supplied from the secondary side of the current transformer 1 is bypassed at the contact point of the bypass relay 5 to secure the power source of the lighting device disconnection detecting device.

When the bypass relay 5 is broken, a high voltage generated by opening the secondary side of the current transformer 1 is discharged at a predetermined level when the arrester 11 and the arrester 15 of the overvoltage protection circuit 3 are connected in series. Fired light 2
To the film cutout 14 connected to. This operation is alternately repeated up to a predetermined number of times.

The lighting device 2 that has been disconnected even after performing the predetermined number of times
When the overvoltage detection circuit 4 detects an overvoltage without causing the film cutout 14 connected to the short circuit to operate, the bypass relay 5 is made to be in the make state, the contact of the bypass relay 5 is short-circuited, and the inside of the lamp disconnection detection device is To bypass the current from the secondary side of the current transformer 1.

As described above, by switching the connection configuration between the arresters 11 and 15 of the overvoltage protection circuit 3, the voltage level at which the overvoltage protection circuit 3 starts discharging is reduced before the disconnection is detected, and the disconnection is performed. Since the height can be increased after the detection, the core break of the lighting device 2 can be reliably detected, and the film cutout 14 connected to the broken lighting device 2 can be more reliably short-circuited.

When the film cutout 14 connected to the ignited lighting device 2 does not short-circuit, or when it takes a long time before the short-circuit operation, the current cutout 1 of the current transformer 1 due to the deficiency of the lighting device 2 can be obtained. By returning the open state of the secondary side in a predetermined time, the influence on the primary side of the current transformer 1 can be suppressed, and system reliability can be improved.

The ninth embodiment can be implemented as follows. This other embodiment is a combination of the ninth embodiment shown in FIG. 5 and the seventh embodiment.

The overvoltage detection circuit 4 informs the arithmetic processing circuit 9 that an overvoltage condition has occurred. Then, the arithmetic processing circuit 9 puts the bypass relay 5 in the make state, supplies the current supplied from the secondary side of the current transformer 1 to the power supply circuit 10, and secures the power supply of the lamp disconnection detecting device 30. Thereafter, the switching relay 16 is set to the break state, and the switching relay 16 is turned on.
Arrestor 11 and arrester 15
Are connected in series, the arithmetic processing circuit 9 controls the bypass relay 5 alternately between make and break at a predetermined cycle. At this time, when the bypass relay 5 is made, the current supplied from the secondary side of the current transformer 1 is
The power supply of the lighting device disconnection detection device is secured by bypassing at the contact point.

When the bypass relay 5 is broken, a high voltage generated by opening the secondary side of the current transformer 1 is discharged at a predetermined level when the arrester 11 and the arrester 15 of the overvoltage protection circuit 3 are connected in series. Fired light 2
To the film cutout 14 connected to. As a result, the repetition is alternately performed unconditionally up to a predetermined number of times. If the overvoltage detection circuit 4 detects an overvoltage without performing the short-circuit operation of the film cutout 14 connected to the fired lighting device 2 even after performing the predetermined number of times, the bypass relay 5 is set to the make state and the bypass relay 5 is turned on. Are short-circuited, and the current from the secondary side of the current transformer 1 is bypassed inside the lamp disconnection detecting device 30.

As described above, by switching the connection configuration of the arresters 11 and 15 of the overvoltage protection circuit 3, the voltage level at which the overvoltage protection circuit 3 starts discharging is reduced before the disconnection is detected, and the disconnection detection is performed. Thereafter, the height can be increased, so that the disconnection of the lighting device 2 can be reliably detected, and the film cutout 14 connected to the disconnected lighting device 2 can be more reliably short-circuited.

When the film cutout 14 connected to the ignited lighting device 2 does not short-circuit or takes a long time until the short-circuiting operation takes place, the current transformer 1 due to the deficiency of the lighting device 2 is used. By returning the open state of the secondary side in a predetermined time, the influence on the primary side of the current transformer 1 can be suppressed and system reliability can be improved.

Next, FIG. 6 shows a ninth embodiment of the present invention.
Can be implemented as shown in FIG.

FIG. 6 shows an eighth embodiment of the present invention.
6 denote the same or corresponding parts, and FIG.
Is applicable when the dimming circuit 13 is additionally provided in FIG. In this other embodiment, in addition to the ninth embodiment, when an overvoltage condition is detected, the operation and release of the bypass relay 5 shown in FIG. 6 are performed in principle for a predetermined number of times. Then, while the bypass relay 5 is released and returned, if the overvoltage state is detected even after the predetermined number of times, the bypass relay 5 is operated to protect the system.

With this configuration, the occurrence of an overvoltage condition is notified to the arithmetic processing circuit 9. And the arithmetic processing circuit 9
Stops the control of the dimming circuit 13 so that all the current from the secondary side of the current transformer 1 flows to the lighting device 2 and raises the voltage generated by the open state of the secondary side of the current transformer 1. At the same time, the arithmetic processing circuit 9 puts the bypass relay 5 in the make state, supplies the current supplied from the secondary side of the current transformer 1 to the power supply circuit 10, and secures the power supply of the lamp disconnection detecting device 30. .

After that, the switching relay 16 is set to the break state, the contact 16a of the switching relay 16 is opened, and the arrester 11 and the arrester 15 are connected in series. Then, the arithmetic processing circuit 9 sets the bypass relay 5 at a predetermined cycle. And break are controlled alternately.

When the bypass relay 5 is broken, a high voltage generated by opening the secondary side of the current transformer 1 is discharged at a predetermined level when the arrester 11 and the arrester 15 of the overvoltage protection circuit 3 are connected in series. Fired light 2
To the film cutout 14 connected to. This is alternately repeated until a predetermined number of times is reached.
Until the overvoltage condition is no longer detected.

A lighting device 2 that has been disconnected even after performing the predetermined number of times.
When the overvoltage detection circuit 4 detects an overvoltage without the short circuit operation of the film cutout 14 connected to the bypass relay 5, the bypass relay 5 is set to the make state, the contact of the bypass relay 5 is short-circuited, and Internally, current from the secondary side of the current transformer 1 is bypassed.

As described above, even when any one of the plurality of lighting devices 2 is disconnected while the current flowing through the plurality of lighting devices 2 is controlled by the dimming circuit 13, the light is connected to the disconnected lighting device. Since the voltage applied to the film cutout 14 can be increased, the short-circuit operation of the film cutout 14 can be easily performed.

Further, by switching the connection configuration of the arresters 11 and 15 of the overvoltage protection circuit 3, the voltage level at which the overvoltage protection circuit 3 starts discharging is reduced before the disconnection is detected, and after the disconnection is detected. Since the height of the lighting device 2 can be increased, the centering of the lighting device 2 can be reliably detected and the broken lighting device 2 can be detected.
Can be more reliably short-circuited.

Further, when the film cutout 14 connected to the ignited lighting device 2 does not perform a short-circuit operation or when it takes a long time until the short-circuit operation is performed, the current transformer 1 due to the deficiency of the lighting device 2 is disconnected. By returning the open state of the secondary side in a predetermined time, the influence on the primary side of the current transformer 1 can be suppressed, and system reliability can be improved.

Further, the ninth embodiment can be implemented as follows. In this other embodiment, in addition to the ninth embodiment shown in FIG. 6, when an overvoltage state is detected, the operation and release of the bypass relay 5 are executed unconditionally a predetermined number of times, and thereafter the overvoltage state is not released. When the overvoltage condition is detected while the detection is being recovered, the system is protected by setting the operation state of the bypass relay 5.

The overvoltage detection circuit 4 informs the arithmetic processing circuit 9 that an overvoltage condition has occurred. Then, the arithmetic processing circuit 9 stops the control of the dimming circuit 13 so that all the current from the secondary side of the current transformer 1 flows to the lighting device 2, and the secondary side of the current transformer 1 is opened. , The arithmetic processing circuit 9 puts the bypass relay 5 into a make state, and supplies a current supplied from the secondary side of the current transformer 1 to the power supply circuit 10 so as to detect the disconnection of the lighting device. Secure 30 power supplies.

Thereafter, the switching relay 16 is set to the break state, and the contact 16a of the switching relay 16 is opened to release the arrester 1
After connecting the arrestor 1 and the arrester 15 in series, the arithmetic processing circuit 9 alternately controls the make and break of the bypass relay 5 at a predetermined cycle. When the bypass relay 5 is made, the current supplied from the secondary side of the current transformer 1 is bypassed at the contact point of the bypass relay 5 to secure the power supply of the lighting device disconnection detecting device.

When the bypass relay 5 is broken, a high voltage generated by opening the secondary side of the current transformer 1 is discharged at a predetermined level when the arrester 11 and the arrester 15 of the overvoltage protection circuit 3 are connected in series. Fired light 2
To the film cutout 14 connected to. This is repeated alternately and unconditionally until a predetermined number of times.

The lighting device 2 that has been disconnected even after the predetermined number of times has been performed
If the overvoltage detection circuit 4 detects an overvoltage without the short-circuit operation of the film cutout 14 connected to the switch, the bypass relay 5 is set to the make state, the contact of the bypass relay 5 is short-circuited, and Internally, current from the secondary side of the current transformer 1 is bypassed.

As described above, even if any one of the plurality of lighting devices 2 is disconnected while the current flowing through the plurality of lighting devices 2 is controlled by the dimming circuit 13, the disconnected lighting device 2 Since the voltage applied to the film cutout 14 connected to the film cutout 14 can be increased, the short circuit operation of the film cutout 14 can be easily performed.

By switching the connection between the arrester 11 and the arrester 15 of the overvoltage protection circuit 3, the voltage level at which the overvoltage protection circuit 3 starts discharging is reduced before the disconnection is detected, and after the disconnection is detected. Since the height of the lighting device 2 can be increased, the centering of the lighting device 2 can be reliably detected and the broken lighting device 2 can be detected.
Can be more reliably short-circuited.

Further, when the film cutout 14 connected to the lighted lighting device 2 does not short-circuit, or when it takes a long time before the short-circuiting operation, the current cutout 1 of the current transformer 1 due to the light-off of the lighting device 2 is used. By returning the open state of the secondary side in a predetermined time, the influence on the primary side of the current transformer 1 can be suppressed, and system reliability can be improved.

As described above, according to the ninth embodiment, when one of the plurality of lighting devices is disconnected and the determination of the disconnection is made, the control of the dimming circuit is stopped and the overvoltage protection level is reduced. The level should be higher than before cutting. Then, the high overvoltage protection level is applied to the short-circuit member, and the operation and release of the bypass relay are repeated. Thus, the short-circuit member can be reliably short-circuited and restored.

[0115]

As described above, according to the first aspect of the present invention, when the lighting device is disconnected and the lighting closed circuit is opened, the overvoltage protection level is maintained, and the overvoltage protection level and the voltage of the constant voltage diode are maintained. Since the overvoltage condition is detected based on the zener voltage and the disconnection of the lighting device is determined and notified to the outside, accurate detection of the disconnection is possible. Can be reduced.

According to the second aspect of the present invention, when the over-voltage state is detected again after the bypass relay has been operated for a predetermined time, the disconnection is determined, so that the erroneous determination of a transient voltage abnormality such as noise can be made. Avoided and accurate determination of decentering can be made.

According to the third aspect of the present invention, in the case where the lighting state of the lamp is changed from off to on by controlling the dimming circuit, an intermittent current flows to the lighting closed circuit even when the light is off, and the core can be disconnected. If the lighting closed circuit generates a high voltage,
It has a dimming circuit and can detect disconnection even when the light is off.

According to the fourth aspect of the present invention, when any one of the plurality of lighting devices is disconnected, the bypass relay provided in the lighting closed circuit is operated and the operation is released, and the short-circuit member is short-circuited to turn on the lighting closed circuit. Is formed, it is possible to determine the centering, and it is possible to light a lamp that is not centered.

According to the fifth aspect of the present invention, the operation and release of the bypass relay are repeatedly performed until the overvoltage state is not detected, so that the short-circuit member is reliably short-circuited to form a closed circuit, and the lamp is not disconnected. Can be turned on.

According to the sixth aspect of the present invention, when it takes a long time to terminate and short-circuit the bypass relay after performing and releasing the bypass relay a predetermined number of times, it is possible to avoid the influence on the primary side of the current transformer. .

According to the seventh aspect of the present invention, when the overvoltage state is not detected by repeating the operation and release of the bypass relay a predetermined number of times, the bypass relay can be released and returned, and even if the overvoltage state is detected, the bypass relay can be released. Can be operated to protect the power supply on the primary side of the current transformer.

According to the invention of claim 8, when any one of the plurality of lighting devices is disconnected, the control of the dimming circuit is stopped, and the operation and release of the bypass relay are performed. This makes it easy to return the lamp to an early stage and turn on a lamp that is not disconnected.

According to the ninth aspect of the present invention, when any of the plurality of lighting devices is disconnected and the disconnection is determined, the control of the dimming circuit is stopped and the overvoltage protection level is reduced. Since the operation and release of the bypass relay are repeated at a higher level than before, the short-circuit member can be reliably short-circuited and restored.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of a lighting device disconnection detecting device according to a first embodiment of the present invention.

FIG. 2 is a circuit diagram of a lighting device disconnection detecting device according to a third embodiment of the present invention.

FIG. 3 is a circuit diagram of a lighting device disconnection detecting device according to a fourth embodiment of the present invention.

FIG. 4 is a circuit diagram of a lighting device disconnection detecting device according to an eighth embodiment of the present invention.

FIG. 5 is a circuit diagram of a lighting device disconnection detecting device according to a ninth embodiment of the present invention.

FIG. 6 is a circuit diagram of a lighting device disconnection detecting device showing another embodiment of the ninth embodiment of the present invention.

FIG. 7 is a circuit diagram for lighting a conventional lighting device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Current transformer 2 Lighting device 3 Overvoltage protection circuit 4 Overvoltage detection circuit 5 Bypass relay 5a Bypass relay contact 6 Transmission line 7 External device 8 Transmission control circuit 9 Arithmetic processing circuit 10 Power supply circuit 11, 15 Arrester 12 Constant voltage diode 13 Dimming Circuit 14 Film cutout 16 Switching relay 17 Constant current power supply

Claims (9)

[Claims] 1. A closed circuit in which a current source is connected to a primary side of a current transformer and a lighting device is connected to a secondary side of the current transformer,
A lighting closed circuit for lighting the lamp by the current supplied by the closed circuit, and a disconnection of a light emitting portion of the lighting device detected from a voltage abnormal state of the lighting closed circuit, and supplied to the lighting closed circuit. A lighting circuit disconnection detection device comprising: a detection circuit provided at a stage preceding the lighting closing circuit using a current as a self-power source; wherein the light emitting portion of the lighting device is disconnected and the lighting closed circuit is opened. An overvoltage protection circuit that absorbs a high voltage generated in the lighting closed circuit with an arrester and maintains the overvoltage protection level, and a voltage corresponding to the overvoltage protection level maintained by the overvoltage protection circuit and the zener voltage of the constant voltage diode. An overvoltage detection circuit for detecting an overvoltage state based on the above, and a bypass circuit formed before the lighting closed circuit when the lighting closed circuit is opened, thereby confirming the self power supply of the detection circuit. A bypass relay to be maintained, and determining disconnection of the lighting device based on an overvoltage state detected by the overvoltage detection circuit, and outputting the determination information to the outside via a transmission control circuit, and controlling the bypass relay. A lighting device disconnection detecting device, comprising: an arithmetic processing circuit. 2. The arithmetic processing circuit operates the bypass relay for a predetermined time according to an overvoltage state detected by the overvoltage detection circuit, and the lighting device detects the overvoltage state again after the predetermined time. The apparatus for detecting a centerline disconnection of a lighting device according to claim 1, wherein a process for determining the centerline of the lamp is performed. 3. A bypass circuit for bypassing in parallel with the lighting closed circuit is formed at a stage preceding the lighting closed circuit,
A dimmer is provided for adjusting the lighting state of the lighting device by shunting the lighting current supplied to the lighting device, and the current flowing to the bypass circuit is periodically interrupted for a short period of time to increase the lighting current to the lighting closed circuit. The lighting device disconnection detecting device according to claim 1, wherein a voltage is generated to enable the overvoltage detecting circuit to detect the overvoltage state. 4. A closed circuit in which a current source is connected to a primary side of a current transformer and a lighting device is connected to a secondary side of the current transformer,
A lighting closed circuit for lighting the lamp by the current supplied by the closed circuit, and a disconnection of a light emitting portion of the lighting device detected from a voltage abnormal state of the lighting closed circuit, and supplied to the lighting closed circuit. A lighting circuit disconnection detection device including a detection circuit provided at a stage preceding the lighting closed circuit that uses a current as a self-power source, wherein the lighting closed circuit connects a plurality of lighting devices in series, and these lighting devices are connected to each other. While a short-circuit member that short-circuits when a high voltage is applied to each of them is connected in parallel, the detection circuit includes:
An overvoltage protection circuit that absorbs a high voltage generated in the lighting closed circuit due to the light emitting portion of the lighting device being disconnected and opening the lighting closed circuit with an arrestor, and maintaining the overvoltage protection level; An overvoltage detection circuit that detects an overvoltage state based on the overvoltage protection level maintained by the protection circuit and a voltage corresponding to the zener voltage of the constant voltage diode, and a stage preceding the lighting closed circuit when the lighting closed circuit is opened. A bypass relay that forms a bypass circuit to secure the self-power of the detection circuit, and determines the disconnection of the lamp based on the overvoltage state detected by the overvoltage detection circuit, and transmits the determination information to the transmission control circuit via the transmission control circuit. And an arithmetic processing circuit for controlling the short-circuit member to be short-circuited while the bypass relay is operated and then released after being operated. Firearms sectional core detector. 5. The arithmetic processing circuit determines the disconnection based on an overvoltage state detected by an overvoltage detection circuit, operates the bypass relay for a predetermined time, and repeatedly releases the operation of the bypass relay. The apparatus for detecting a core disconnection of a lighting device according to claim 4, further comprising means for terminating the operation after the overvoltage state is not detected. 6. The arithmetic processing circuit determines the disconnection based on the overvoltage state detected by the overvoltage detection circuit, repeats the cancellation of the operation of the bypass relay operation, and repeats these operations a predetermined number of times. 5. The lighting device according to claim 4, further comprising means for canceling the bypass relay when the overvoltage state is not detected and terminating the operation, and terminating the operation by holding the bypass relay operation when the overvoltage state is detected after a predetermined number of times. Decentering detection device. 7. The arithmetic processing circuit determines a disconnection based on an overvoltage state detected by the overvoltage detection circuit, and causes the bypass relay to operate and release a predetermined number of times, and after the execution, detects the overvoltage state. 5. The device for detecting disconnection of a lighting device according to claim 4, further comprising means for activating said bypass relay at said time and canceling operation of said bypass relay when said overvoltage state is not detected. 8. A bypass circuit is formed before the lighting closed circuit in parallel with the lighting closed circuit, and a current supplied to the lighting closed circuit is diverted to the bypass circuit to adjust a lighting state of the lighting device. A dimmer is provided, and the arithmetic processing circuit is provided with means for stopping the diversion to the bypass circuit by the dimmer when the core is determined based on the overvoltage state detected by the overvoltage detection circuit. The lighting device disconnection detecting device according to any one of claims 4 to 7, characterized in that: 9. The arithmetic processing circuit is capable of switching the overvoltage protection level of the overvoltage protection circuit in multiple stages,
Normally, the overvoltage protection level is set to a predetermined state, and when disconnection is determined based on the overvoltage state, a means for switching the overvoltage protection level to a higher state than the normal predetermined state is provided. The lighting device disconnection detecting device according to any one of claims 4 to 8, characterized in that: