JP2675660B2 - Light core break detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Industrial field of application) The present invention relates to a lamp for detecting disconnection of a lamp connected to the secondary side of a plurality of insulation transformers connected in series. The present invention relates to a core breaking detection device.

(Prior Art) In general, a series lighting circuit is for lighting a large number of lights used for approach guidance of an airport runway. The series lamp lighting circuit is provided with a lamp core breakage detection device that detects that any one of the plurality of lamps has core broken.

FIG. 6 is a block diagram showing the configuration of the above-described conventional lamp core break detection device.

In FIG. 6, the constant current power supply device 2 supplies a constant current output to the series lighting circuit 66 by controlling the phase of the power supplied from the AC power supply 1 based on the supplied power. The series lighting circuit 66 includes insulation transformers CT ₁ , CT ₂ , ..., C having primary sides connected in series.
Has a T _n, these isolation transformer CT _1, CT _2, ..., lights L ₁ that are respectively connected to the secondary side of the CT _n, L _2, ..., lights control L _n. Light L
₁ , L ₂ , ..., L _n are respectively output from the constant current power supply device 2,
The brightness is kept constant by the current supplied through the insulation transformers CT ₁ , CT ₂ , ..., CT _n .

The disconnection detection unit 65 detects the disconnection of the above-mentioned lights L ₁ , L ₂ , ..., L _n from the change in the electric signal input through the instrument current transformer 63 and the instrument transformer 64. is there.

Here, the process of detecting the burnout of the lamp by the burnout detecting unit 65 will be described. The lights L ₁ , L ₂ , shown in FIG.
..., if any of the L _n is the sectional core, the secondary side of the isolation transformer that Dancing the lamp is connected in an open state. When the secondary side of the insulation transformer is opened, the load impedance seen by the constant current power supply device 2 supplying current to the broken lamp changes accordingly. By changing the load impedance viewed from the constant current power supply device 2 in this way, the output voltage waveform and the output current waveform of the constant current power supply device 2 become as shown in FIG. The principle of detecting the disconnection of the light in this case is described in, for example, Japanese Patent Publication No. 61-15556. When the secondary side of the insulation transformer is opened due to the disconnection of the lamp, a magnetic saturation phenomenon occurs, and the rise of the output current of the constant current power supply device 2 is slow until the insulation transformer is magnetically saturated. The waveform has a rising delay that is longer than that when the lamp is not disconnected. On the other hand, regarding the output voltage of the constant current power supply device 2, the waveform rises sharply while the rising of the output current is delayed (saturation time α, α is also the phase control angle). The time-integrated values m ₁ , m ₂ , ..., M _n of the voltage waveform, which correspond to the area of the hatched portion at this time, are as shown in FIG. Proportional to the number. Where 1
Since the time integral value when the lamps are burnt out is represented by m ₁ , if the time integral value obtained by the burnout detecting section 65 is m ₃ , the number of burnt out lamps is 3 It can be seen that it is.

(Problems to be Solved by the Invention) By the way, the conventional lamp core disconnection detection device having the above-described configuration can detect the occurrence of core disconnection in the lamp and the number of lamps in which the core disconnection occurs, but It is not possible to detect and determine in which one of L ₁ , L ₂ , ..., L _{n the} disconnection has occurred.

Therefore, the disconnection detection unit 65 causes the lights L ₁ , L ₂ , ..., L
_When it is detected that core disconnection occurs in any of _n , the worker must make a patrol inspection of the runway at the airport to find the lamp that has core disconnection, which is a problem of inefficient maintenance inspection work. There is a point.

In addition, if the work of converting the broken lamp is delayed, the secondary side of the insulation transformer to which the broken lamp is connected will be left open for a long time, so There is also a problem that a short circuit between windings due to the voltage may occur, and the windings may be burned due to a temperature rise.

Therefore, for the purpose of solving the above problems,
A lamp burnout detecting device having the structure shown in FIGS. 9 and 10 has been proposed. The outline of the lamp burnout detecting device according to the above proposal is as follows. That is, assuming that the lamp L ₁ is disconnected in FIGS. 9 and 10, the overvoltage generated on the secondary side of the insulation transformer CT ₁ by this is detected by the overvoltage detection unit 21. The short-circuit control unit 23 controls the thyristor unit 22 by the detection to short-circuit the secondary side of the insulation transformer CT ₁ so that the disconnection of the lamp L ₁ is not detected by the disconnection occurrence determination unit 6. When the constant current power supply device 2 connected to the AC power supply 1 is momentarily stopped by the power supply control unit 8 of the master station 7, as shown by the dotted line in FIG. Fig. 11 (a)) and output voltage (Fig.
11 (b)) becomes 0. When the current disconnection detection unit 25 of the terminal unit R1 detects through the transformer 26 that the instantaneous stop has been performed, the short circuit control unit 23, based on the detection, the time setting unit.
After the time t1 set to 24 has elapsed, the thyristor unit 22
The short circuit due to is released during the time T as shown in FIG. 11 (d). When the short circuit is released, the output voltage waveform (Fig. 11 (b)) changes due to the core disconnection of the lamp L ₁ , so disconnection of the instrument current transformer 3 and the instrument transformer 4 occurs. The determination unit 6 detects this change by the time integration method described above,
The core station 7 is notified when it is determined that the core is disconnected. Based on this notification, in the disconnection position determination unit 9 of the master station 7, the power supply control unit 8
Is determined from the moment when the momentary stop is made to the moment when the core-break occurrence determination unit 6 detects the core break. And the calculated time and the judgment time for each lamp stored in advance
Which of t ₁ , t ₂ , ..., T _n is matched is compared, and if they match t ₁ , it is determined that the lamp L ₁ is disconnected. It should be noted that FIG. 12 shows that the lamp current disconnection detection unit 42 detects that the current flowing in the lamp L ₁ is cut off due to the occurrence of core disconnection through the current transformer 41 connected in series to the lamp L _1. 3 shows a terminal unit RR ₁ having the above configuration. Except for detecting the occurrence of core disconnection as described above, it is exactly the same as the terminal unit R _{1 according} to FIG. 10 described above.

By using the light burnout detecting device having the above configuration,
When a core break occurs in any of a plurality of lamps installed, this core break can be detected and when an abnormality occurs in any of the terminals provided for each firing It has become possible to detect the terminal unit where an abnormality has occurred.

However, in the light core disconnection detection device having the above configuration, it is not predicted that an abnormality will occur in each of the terminal units R _{1 to} R _n ,
Therefore, no countermeasure is taken when the short-circuit control unit 23 does not operate due to an abnormality in the terminal units R _{1 to} R _n . Therefore, when any of the terminal units R _{1 to} R _n becomes abnormal, the disconnection occurrence determination unit 6 cannot detect the abnormality that has occurred at each of the terminal units R _{1 to} R _n .
Further, since it is premised that each of the terminals R _{1 to} R _n is normally normal, even if any of the lights L _{1 to} L _n is disconnected, the insulation transformation is performed by the short-circuit controller 23 of the corresponding terminal. Since the two sides of the container must be short-circuited by all means, the time integration value of the voltage waveform by the disconnection occurrence determination unit 6 always shows a high value due to the occurrence of an abnormality in the terminal end that responds to the disconnected lamp. I do not anticipate such a situation at all. So, for example, light L ₁
Assuming that the terminal portion R ₁ becomes abnormal due to disconnection, the disconnection position determination unit 9 cannot detect the disconnection of the lamp L ₁ , and the disconnection occurrence determination unit 6 does not detect each lamp L 1. _Since the time integration value of the voltage waveform when none of _{1 to} L _n is disconnected is used as the criterion for determining whether or not disconnection has occurred, the remaining terminal is normal and the remaining lamp is disconnected. If it happens,
There is a problem in that it is not possible to detect a lamp that has been disconnected.

The object of the present invention, even if any one of the plurality of lamps is cored and an abnormality occurs in the corresponding terminal part, when any one of the lamps corresponding to other normal terminal parts is cored An object of the present invention is to provide a lamp disconnection detection device capable of detecting a generated lamp.

[Configuration of the invention]

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a secondary side of two or more transformers connected in series to a constant current type AC power source.
In a lamp disconnection detection device of a series lighting circuit each having a lamp lighting circuit, an AC power supply control means for performing a control to momentarily stop the output of the AC power supply for a time set in a range that does not hinder the lighting of each of the lights, Provided for each lighting, open state detection means for detecting that the secondary side of the corresponding transformer is in the open state, and provided for each lighting,
When the secondary side of the transformer is short-circuited due to the detection of the open state of the secondary side of the transformer and there is a momentary stop of the output of the AC power supply, a short-circuit control for releasing the short-circuit for a predetermined time after the elapse of a preset determination time. Means and the pulsed voltage value of the AC power supply output are sequentially input, and this voltage value is compared with a lamp burnout determination reference value determined from the voltage value input during a predetermined period before the input time of this voltage value. However, if the difference between the two is larger than the expected range, a disconnection determination means for determining that a core disconnection has occurred, and a different determination time is set for each of the lights, and the determination is made from the momentary stop of the AC power output. A lamp discriminating means for counting the time until the detecting operation of the disconnection discriminating means, comparing the time with each of the discriminating times, and discriminating the lamp for which the discriminating time is set to coincide with the counted time. And

(Operation) In the above configuration, the AC power supply control means controls the output of the AC power supply to be instantaneously stopped for a set time within a range that does not hinder the lighting of each light, and the open state detection means operates for each light. It is provided and detects when the secondary side of the corresponding transformer is open. The short-circuit control means is provided for each lamp, and when there is a momentary stop of the AC power output after short-circuiting the secondary side of the transformer upon detection of the open state of the secondary side of the transformer, After a lapse of the set judgment time, the short circuit is released for a fixed time. The disconnection determination means sequentially inputs the pulsed voltage value of the AC power output, and a lamp disconnection determination criterion determined from this voltage value and the voltage value input in a predetermined period before the input time of this voltage value. If the difference between the two values is larger than the expected range, it is determined that a burnout has occurred.Furthermore, the light determination means sets a different determination time for each light and the moment when the AC power is output. Since the time from the stop time to the detection operation time of the disconnection judging means is counted and compared with each judgment time, it is decided to judge the lamp having the judgment time set to coincide with this counting time. Even if one of the lights is disconnected and an abnormality occurs in the corresponding terminal part, this disconnected light should be detected when any of the lights corresponding to other normal terminals is disconnected. Became possible.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

As is clear from the contents described above, the light core disconnection detection device according to the present invention is generally applied to a series light lighting circuit for lighting a large number of lights used for approach guidance of an airport runway. Then, it is configured to detect that any one of the many lights is disconnected.

FIG. 1 is a block diagram showing a configuration of a lamp core breakage detecting device according to an embodiment of the present invention.

In FIG. 1, a constant-current type AC power supply, for example, a constant-current power supply device 2 controls a phase of the power supplied from the AC power supply 1 to output a constant-current output to a series lighting circuit 5.
To supply. Series lighting circuit 5 is connected to the primary side in series isolation transformer CT _1, CT _2, ..., has a CT _n, these series-connected insulated transformer CT _1, CT _2, ..., the CT _n Lighting control of the lights L ₁ , L ₂ , ..., L _n respectively connected to the secondary side is performed. Light L ₁ , L ₂ , ..., L _n
Are output from the constant current power supply device 2, respectively, and the insulation transformer
The luminance is kept constant by the current supplied through CT ₁ , CT ₂ , ..., CT _n .

Wherein each lighting L _1, L _2, ..., the L _n, respectively the terminal unit _{R 1, R 2, ...,} R n
Is provided. Each of the terminal units R ₁ , R ₂ , ..., R _n has the same internal configuration, and the internal configuration thereof is as shown in FIG. Each terminal mentioned above
Details of the configuration of R ₁ , R ₂ , ..., R _n will be described later with reference to FIG.

In the device shown in FIG. 1, a master station 7 for detecting the output from the constant current power supply device 2 and controlling the constant current power supply device 2 is further connected to the output side of the constant current power supply device 2. Has been done. The master station 7 starts the disconnection determination means, such as the disconnection / abnormality occurrence determination portion 16, and the AC power supply control means, such as the power supply control portion 8.
And a light discriminating means, for example, a disconnection position discriminating unit 9.

The disconnection / abnormality occurrence determination unit 16 is connected to the instrument current transformer 3 and the instrument transformer 4, respectively. The disconnection / abnormality occurrence determination unit 16 is, for example, the disconnection detection unit 65 according to the conventional device described above.
By a procedure analogous to, it lights L _1, L _2, ..., not only Dancing to any of L _n it is determined whether or not the generated, each terminal unit
It is also to determine whether or not an abnormality has occurred in any of R ₁ , R ₂ , ..., R _n . As shown in FIG. 1, the disconnection / abnormality occurrence determination unit 16 includes the voltage waveform counting unit 10, the reference value automatic setting unit 11, the disconnection determination unit 14, and the current waveform counting unit 1.
2, tap-based reference value setting unit 13 and system abnormality determination unit 15
Is provided.

The voltage waveform counting unit 10 inputs the output voltage of the constant current power supply device 2 through the voltage transformer 4 to calculate the time integral value of the output voltage waveform, and then pulse the obtained time integral value. Then, this pulse signal is counted, and this count value C _V
Are output to the reference value automatic setting unit 11 and the disconnection determination unit 14, respectively. The reference value automatic setting unit 11 reads the numerical value C _V output from the voltage waveform counting unit 10 and monitors it for a fixed period. Then, the count value C _V input during the fixed period is a preset fixed range: ±
Check the order of entry whether the K, the checked count value C _V is the predetermined range: When was over ± K is the count value C _V that held until then the regimen numerical C _V Update. On the other hand, when the checked count value C _V does not exceed the above range, the count value C _V is not updated. Then, the count value C _V held at the time when the above cycle ends is set as the voltage waveform count value: C _S when there is no (or when) there is a burnout lamp. Further, an appropriate lamp burnout detection device: C _S ± K is set as a threshold value for determining the presence or absence of burnout light, and the set reference value C _S ± K is set to the burnout determination unit 14 and The data is output to the system abnormality determination unit 15, respectively. The disconnection determination unit 14 inputs the above-described lamp disconnection detection device: C _S ± K output from the reference value automatic setting unit 11 and the count value C _S output from the voltage waveform counting unit 10, and both To compare. Then, based on the comparison result, the presence or absence of the disconnection lamp is determined, and the determination result is notified to the disconnection position determination unit 9.
As described above, in the present embodiment, the reference value automatic setting unit 11 sets the disconnection determination reference value: C _S ± K. However, instead of the above method, all the count values C _V input during a certain period are stored, and the average value of all the count values C _V stored until then at the end of this period, The disconnection determination reference value may be set based on the obtained average value.

The current waveform counting unit 12 inputs the output current of the constant current power supply device 2 through the instrument current transformer 3 to calculate the time integral value of the output current waveform, and then pulse the obtained time integral value. Then, this pulse signal is counted, and this count value C _I
Is output to the tap-based reference value setting unit 13. The tap-by-tap reference value setting unit 13 reads the count value C _I output from the current waveform counter unit 12 and normally operates the entire system preset corresponding to each tap of the constant current power supply device 2. The voltage waveform count value C _{VX during the operation} is output to the system abnormality determination unit 15. In the tap-by-tap reference value setting unit 13, the reason for performing the above processing is that in the constant current power supply device, the value of the output current is for each tap value for switching the brightness of each lamp L _{1 to} L _n. This is because it is controlled so that it is always a constant value, and that it is not affected by the presence or absence of disconnection lighting. This system abnormality determination unit
The reference numeral 15 reads the voltage waveform count value C _VX output from the tap reference value setting unit 13 and gives an appropriate range: ± K to the read voltage waveform count value C _VX . And
This system failure determination reference value: the C _VX ± K, the abnormal determination reference value: C _VX ± K and the reference value automatic setting unit 11 is output from the said sectional core criterion value: by comparing the C _S , It is detected whether or not an abnormality has occurred in each part constituting the system. That is, when the system is operating normally,
The above abnormality determination reference value C _VX + K and the above-mentioned lamp burnout determination reference value:
Although C _S ± K has the same value, a short-circuit control does not occur due to the occurrence of disconnection lamps and an abnormality in the terminal unit corresponding to the disconnection lamps.
Is no longer operating, as described above, the time integration value of the output voltage waveform of the constant current power supply 2 always shows a high value, and therefore the lamp burnout determination reference value: C _S ± K is higher. It becomes a value. The system abnormality determination unit 15 notifies the disconnection position determination unit 9 of the determination result. The power supply control unit 8 in the master station 7 controls the output of the constant current power supply device 2. The power supply control unit 8 includes the lights L ₁ , L ₂ , ..., L _n ,
Regardless of whether or not there is a lamp that has been disconnected,
Based on the request signal output from the disconnection position determination unit 9, at regular intervals (for example, 10 minutes or several minutes less), for example, a short time of 1 cycle and 2 cycles that does not interfere with lighting of the lamp, The output is stopped momentarily (hereinafter referred to as "instantaneous stop"). Disconnection position determination unit 9
Does not only determine whether or not a request for determining the presence or absence of disconnection or a request for diagnosing normality / abnormality of each terminal unit R ₁ , R ₂ , ..., R _N by measuring the momentary stop time, A time (hereinafter, simply referred to as “judgment time”) for determining whether or not the lights are normal lights having different lengths for each of the lights L ₁ , L ₂ , ..., L _{n in} advance t ₁ , t ₂ , ..., t _n are stored.
When determining the presence / absence of the burnout lamp, the burnout position determination unit 9 determines that the burnout / abnormality occurs at any of the lights L ₁ , L ₂ , ..., L _n. The time point when the power supply control unit 8 controls the output of the constant current power supply device 2 after the output fluctuation of the constant current power supply device 2 is detected by 16 is set as a reference time point. From the reference time point, the disconnection / abnormality occurrence determination unit
The counting time and the determination time t ₁ , t ₂ , ..., T _{n that} are different for each of the lights L ₁ , L ₂ , ..., L _n determined by the output time point of the signal output from 16 in time series Correspond to. As described above, the disconnection position determination unit 9 associates each of the lights L ₁ , L ₂ , ..., L _{n with the} counting time and the determination time separately, so that each of the lights L ₁ , L _{2. It} is determined whether or not L _n is normal, and as a result of this determination, when it is recognized that there is a broken lamp, the position of the broken lamp is detected. Further, the disconnection position determination unit 9 diagnoses the normality / abnormality of each of the terminal units R _{1 to} R _{n in} the same manner as described above,
The positions of the respective terminal units R _{1 to} R _n that are recognized as normal are detected.

The determination times t ₁ , t ₂ , ..., T _n described above will be described in detail later.

FIG. 2 shows the respective terminal units R ₁ and R shown in FIG.
₃ is a block diagram showing an internal structure of a terminal unit R ₁ of ₂ , ..., R _n . FIG. As described above, the terminal units R ₁ , R ₂ , ..., R
_Since the internal configuration of _n is the same, only the internal configuration of the terminal unit R ₁ is shown for convenience of description.

In FIG. 2, on the secondary side of the insulation transformer CT ₁ , an open state detection means such as an overvoltage detection portion 21 and a short-circuit control means such as a short-circuit portion 27 are provided in parallel with the above-mentioned lamp L ₁ , respectively. Are connected to each other, and the second switching means, for example, a thyristor unit, is connected in series with the lamp L ₁ .
29 is connected. Further, a current break detector 25 is connected to the secondary side of the insulation transformer CT ₁ through a current transformer 26. This current interruption detection unit 25 is a short circuit control unit of the short circuit unit 27.
Connected to 23. The overvoltage detection unit 21 detects a high voltage generated on the secondary side of the insulation transformer CT ₁ due to the disconnection of the lamp L ₁ , and detects this, and configures the short circuit unit 27 through the delay circuit 31. The output is provided to the short-circuit control unit 23. The overvoltage detection unit 21 or, on condition that the lamp L ₁ is normal, opens the thyristor unit 29 that is normally closed to open the high voltage to the secondary side of the insulation transformer CT _1. In the case of occurrence of the error, this is also detected and output to the short circuit controller 23 through the delay circuit 31. The overvoltage detection unit 21 is set to a high impedance so that current does not flow from the secondary side of the insulation transformer CT ₁ . The delay circuit 31 delays the output signal from the overvoltage detection unit 21 for several cycles, and then outputs it to the short circuit control unit 23. The short-circuit unit 27 is the short-circuit control unit 23 described above.
And a first switching means, for example, a thyristor unit 22,
It is composed of a time setting unit 24. Thyristor section
Under the control of the short-circuit controller 23, 22 is the insulation transformer CT.
The secondary side of ₁ is short-circuited.

When the current interruption detector 25 detects through the current transformer 26 that the power supply controller 8 has momentarily stopped the output of the constant current power supply device 2 for a predetermined time, it outputs a predetermined detection signal to the short circuit controller 23.
To be output. The time setting unit 24, determines the time t ₁ is set according to the lighting L _1. The time setting unit 24 outputs the determination time t ₁ to the short circuit control unit 23. The short-circuit control unit 23 uses the thyristor unit on condition that a predetermined overvoltage detection signal is output from the overvoltage detection unit 21.
Close 22. Then, when receiving the detection signal from the current disconnection detection unit 25 and recognizing from the detection signal that the detection of the presence or absence of the disconnection of the lamp is requested, a signal indicating the detection request of the presence or absence of the disconnection of the lamp is output. Time setting unit 24
The thyristor unit 22 is controlled and the secondary side of the insulation transformer CT ₁ is short-circuited until the determination time t ₁ set to is elapsed.
Then, when the judgment time t ₁ has passed, the short circuit is released for a preset fixed time T. The short circuit control unit 23 also closes the thyristor unit 22 on condition that a predetermined overvoltage detection signal is output from the overvoltage detection unit 21. Then, receiving the detection signal from the current interruption detection unit 25, the normal / normal state of each terminal unit R _{1 to} R _n is detected from the detection signal.
When it is recognized that the abnormality diagnosis is requested, the determination time t ₁ set in the time setting unit 24 is set with the time point when the signal indicating the normal / abnormality diagnosis request of the terminal unit is output as the reference time point. Until the time passes, the thyristor unit 22 is controlled to short-circuit the secondary side of the insulation transformer CT ₁ . After that, when the determination time t ₁ elapses, the short circuit is released for a preset fixed time T. The short circuit control unit 23,
When the lamp L ₁ is normal, receiving the detection signal from the current interruption detection unit 25, and recognizing that the diagnosis of the terminal unit is requested from the detection signal, the determination time t ₁ elapses as described above. At that time, the thyristor unit 29 is controlled to open the secondary side of the insulation transformer CT ₁ for a predetermined time. Here, if the time setting unit 24 is further described in detail, as is clear from the above contents, the short-circuit time control unit 23 receives the output signal from the overvoltage detection unit 21 and closes the thyristor unit 22 to short-circuit. After the state, the determination time t ₁ from when the output signal from the current interruption detection unit 25 is received until the operation of releasing the short circuit by the thyristor unit 22 for a fixed time T is executed can be set in advance. Has been done. The determination time set in the time setting unit 24, t for t _1, the terminal unit R ₂ is the terminal unit R _1
2 , ..., for each terminal R _n , t _n
Each of L ₁ , L ₂ , ..., L _n has a different length. In this embodiment, it is assumed that the determination times t ₁ , t ₂ , ..., T _{n have} a relationship of t ₁ <t ₂ <... <t _n .
Also, t ₂ > t ₁ + T _X , t ₃ > t ₂ + T + T _X , ..., t _n > t _n-1 + T + T _X
(Here, T _X is the disconnection / abnormal recovery time shown in FIG. 11C). For these,
It will be described later.

Here, the operation of the disconnection / abnormality determination unit 16 shown in FIG. 1 will be described with reference to the flow chart shown in FIG. In the flowchart shown in FIG. 4, the reference value automatic setting unit 11 sets the voltage waveform counting unit 10
It shows a case where the lamp burn-out determination reference value C _S is set after calculating the time integral value of the voltage waveform output as a pulse signal from n times. That is, the reference value automatic setting unit 11
First reads the time integration value output from the voltage waveform counting section 10. Here, the value read by the reference value automatic setting unit 11 is a value between the first read value: C _V1 and the nth read value: C _Vn (these are collectively referred to as C _Va (Step 101). Value read in step 101 C _Va
However, it is determined whether the value is the value C _V1 read for the first time or a value other than C _V1 (C _{V2 to} C _Vn ) (step 102). If it is determined in step 102 that C _Va = C _V1 , step 1
The value C _V1 read in 01 is temporarily stored in the predetermined storage area “A” of the memory unit in the reference value automatic setting unit 11 (step 103). When it is determined that C _Va ≠ C _V1 in step 102, the value of C _Va is “A” ± K (where “A” means the value of C _V1 described in step 103 of the previous term, Also, ± K
And (indicates a predetermined range) is determined (step 110). If it is determined in step 110 that the value of C _Va is within the above range, the process proceeds to step 104. On the other hand, in step 110, C
If it is determined that the value of _Va is not within the above range, the NG flag set in the reference value automatic setting unit 11 is set to "1". Here, the NG flag is a flag for determining whether or not the value temporarily stored in the predetermined storage area “A” in the previous term is registered in another storage area as the lamp disconnection determination reference value: C _S. When "0", the registration is performed, and when "1", the registration is not performed. Therefore, setting the NG flag to "1" means that the value of C _V1 cannot be used as a reference value for determining whether or not the lamp has a burnout core (step 111). After setting the NG flag to "1" in step 111, the process proceeds to step 104. That is, it is determined whether or not the count number a of the time-integrated value of the voltage waveform has reached the final value: n (step 104). If it is determined in step 104 that a ≠ n, the process proceeds to step 101 to read the next time integral value. By repeating the process described above, including the time is read integrated value C _V2 to the second, C _V3, C _V4, ..., up to C _Vn, C
_It is continuously monitored whether it is within the range of _V1 ± K. If all of these time integrated values are within the range of C _V1 ± K, the value of C _V1 is set as the lamp burn-out determination reference value: C _S , which is different from the predetermined storage area “A” of the memory section. It will be registered (updated) in the area. When the number of times the reference value automatic setting unit 11 has read the time integral value reaches n by repeating the above-described process in this way, a = n, and therefore the routine proceeds to step 105. Then, the step 111
It is determined whether or not "1" is set in the NG flag described in (step 105). When it is determined in step 105 that the NG flag is set to “1”, the lamp disconnection determination reference value: C _S of the value temporarily stored in the storage area “A” is set for the above reason. Is not set, and the process immediately proceeds to step 108. That is, step 1
The NG flag set to "1" in 11 is reset to "0" (step 108), and the number of times a of reading the time integral value of the voltage waveform is also reset to "0" (step 109), and step 101 Return to. On the other hand, when it is determined in step 105 that the NG flag is not set to “1”, the value temporarily stored in the storage area “A” is set as another lamp storage core determination reference value: C _S. (Step 106).
The value set as the lamp disconnection determination reference value: C _{S in} step 106 is the voltage waveform count value C _VX and the lamp disconnection (or the terminal portion) that are preset in the reference value setting unit 13 for each tap during normal system operation. It is determined whether the sum (difference) with the allowable deviation value K applied when determining "abnormal" is within the range of C _VX ± K (step 107). In step 107, C _S is C _VX ± K
If it is determined that the value is within the range of step 10,
Move to 8. On the other hand, when it is determined in step 107 that C _S is within the range of C _VX ± K, the system abnormality determination unit 15 determines that an abnormality has occurred in the terminal unit, and an abnormality has occurred in the terminal unit due to a display or alarm. Notify that Step 11
2) Go to step 108.

Here, based on the contents described above, the reference value automatic setting unit 11
While reading the value of C _V1 ~ C _Vn , for several cycles due to the disconnection of one of the lights,
The case where the time integral value of a high voltage waveform is measured will be described. For this reason, when the time integral value of the voltage waveform in the normal system described above: a value exceeding the range of C _V1 ± K is detected, the value is used as the temporary lamp burn-out determination reference value and the storage area “A Update the contents stored in ". After a few cycles, it was detected that the short-circuit control unit 23 of the terminal unit corresponding to the disconnection lamp performed a short-circuit movement, and the time integral value of the voltage waveform returned to a normal value again. At this point, the storage content in the storage area “A” is updated to the normal value. During this time, in another storage area and the storage area "A", lamplight sectional core determination reference value corresponding to the operation: setting C _S (update) is not performed. Therefore, even during this period, it is possible to stably perform disconnection detection of other lights. Separately from the above-mentioned mode, even if the reference automatic setting unit 11 updates the stored contents in the storage area “A” after reading the time-integrated value of the voltage waveform n times, the other lighting interruptions similar to the above. It is possible to perform stable core detection. In this case, the value of C _S is within the range of C _VX ± K even when compared with the previously set value: C _VX ± K.
R _{1 to} R _n will be judged as “normal”.

Next, any of the above-mentioned lamps L _{1 to} L _n is disconnected, and an abnormality occurs in the terminal portion corresponding to the disconnection lamp in the terminal portions R _{1 to} R _n . A case will be described in which the short-circuit control unit 23 does not perform a short-circuit operation and the time-integrated value of the voltage waveform having a high value is always output from the voltage waveform counting unit 10 to the reference value automatic setting unit 11. In such a state, the time-integrated value of the voltage waveform read by the reference value automatic setting unit 11 from the pressure waveform counting unit 10 is higher than the first value: C _V1 . The value read by the reference value automatic setting unit 11 is temporarily stored in the predetermined storage area “A” as described above, and the stored value is sequentially updated by the newly read value. When the number of readings reaches n, the value temporarily stored in the storage area “A” is set (updated) in another storage area as the lamp burnout determination reference value: C _S. To be done. In this case, since the lamp disconnection determination reference value: C _S is high and out of the range of C _VX ± K, the system abnormality determination unit 15 determines whether any of the terminal units R _{1 to} R _n . It will be determined that an abnormality has occurred in the.

As is clear from the above contents, the lamp burnout determination reference value set by the reference value automatic setting unit 11 and the value counted by the voltage waveform counting unit 10 are compared by the burnout determination unit 14. Since it is decided to determine the presence or absence of a core-breaking lamp, an abnormality occurs in any of the terminal units R _{1 to} R _n and the lamp corresponding to the terminal unit in which this abnormality occurs disconnects the core, which causes the time of the voltage waveform. Even if the integrated value always shows a high value, it is possible to detect the disconnection of other lights without any problem. In addition, the lamp disconnection determination reference value: C _S set in the reference value automatic setting unit 11 and the C _VX ± K set in the tap-based reference value setting unit 13 are compared in the system abnormality determination unit 15. By doing so, it is also possible to determine whether or not an abnormality has occurred in any of the terminal units R _{1 to} R _n .

Next, the operation of the lamp burn-out detection device having the configuration shown in FIGS. 1 and 2 when all the terminal units R _{1 to} R _n are normal will be described. First, assuming that the lamp L ₁ is disconnected, the output of the constant current power supply 2 fluctuates, and this output fluctuation is detected by the disconnection / abnormality occurrence determination unit 16 and output to the disconnection position determination unit 9. It On the other hand, due to the disconnection, the secondary side of the insulation transformer CT ₁ is brought into a state close to an open state and an overvoltage is generated. This overvoltage is detected by the overvoltage detection unit 21 of the terminal unit R ₁ , and a detection signal indicating that an overvoltage has occurred is output to the short circuit control unit 23. Upon receiving the detection signal, the short-circuit control unit 23 controls the thyristor unit 22 to short-circuit the secondary side of the insulation transformer CT ₁ . As a result, the disconnection of the lamp L ₁ is not detected by the disconnection / abnormality occurrence determination unit 16.

On the other hand, in the above-described mode, the power supply control unit 8 instantaneously stops the output of the constant current power supply device 2 indicating, for example, a one-cycle disconnection presence / absence determination request and a two-cycle diagnosis request. Now, when the power supply control unit 8 makes a momentary stop indicating a one-cycle disconnection presence / absence determination request, the output current from the constant current power supply device 2 (see FIG. 11 ( a)) and the output voltage (Fig. 11 (b)) become zero. When the output of the constant current power supply device 2 is instantaneously stopped by the power supply control unit 8, the current interruption detection unit 25 provided in the terminal unit R ₁ detects the instantaneous stop of the output and the short circuit control unit.
Output to 23. When the short circuit control unit 23 receives the output,
From the length of the momentary stop time, it is determined that there is a request for determining the presence or absence of the burnout of the lamp, and after the time t ₁ set by the time setting unit 24 has elapsed, by controlling the thyristor unit 22, the thyristor unit 22 is controlled as shown in FIG. As shown in the figure, the short circuit is released for a fixed time T. In addition, the release of the short circuit is performed after the momentary stop, the time to start counting the time t _n different for each lamp,
This is to synchronize the time when the waveform of one cycle starts. Since short circuit changes when is released the output voltage waveform by the cross-sectional center of the lamp L ₁ (FIG. 11 (b)) occurs, the cross-sectional core / abnormality determination unit 16 detects by the method described above this change,
When it is determined that the core is disconnected, the core position determining unit 9 is notified. In this case, the notification that the disconnection has occurred is delayed by the saturation time α from the start timing of the short circuit release time.

Similarly, if the power supply control unit 8 makes a momentary stop indicating a two-cycle diagnosis request under the condition that the lamp L ₁ is in a normal state, as shown by a dotted line portion in FIG. The output current (FIG. 11 (a)) and output voltage (FIG. 11 (b)) from the constant current power supply device 2 become zero. When the output of the constant current power supply unit 2 is instantaneously stopped by the power supply control unit 8, the current interruption detection unit 25 provided in the terminal unit R ₁ detects the instantaneous stop of the output and outputs it to the short circuit control unit 23. To do. When the short-circuit control unit 23 receives the output, the short-circuit control unit 23 determines from the length of the momentary stop time that the terminal unit is normal / abnormal, and controls the thyristor unit 29 placed in the normally closed state to perform insulation. Open the secondary side of transformer CT ₁ . Under the control of the short-circuit control unit 23, when the secondary side of the insulation transformer CT ₁ is opened by the thyristor unit 29, this opening causes the lighting L
Overvoltage occurs on the secondary side of the insulation transformer CT ₁ as when ₁ is disconnected. When an overvoltage is generated on the secondary side of the insulation transformer CT ₁ in this manner, the generated overvoltage is detected by the overvoltage detection unit 21, and the overvoltage detection unit 21 delays the delay circuit 31.
Through this, an overvoltage detection signal is output to the short circuit control unit 23.
The short circuit control unit 23 uses the detection signal to detect the thyristor unit 22.
Is closed and the secondary side of the insulation transformer CT ₁ is short-circuited.
Then, when recognizing that the time t ₁ has elapsed from the time when the signal indicating that the diagnosis request has been issued is output from the current interruption detection unit 25 based on the output signal from the time setting unit 24, the short circuit control unit 23 As in the case where there is a request to detect the presence or absence of disconnection, the short circuit is released for a fixed time T. Since the output voltage waveform (FIG. 11 (b)) changes due to the release of this short circuit, the disconnection / abnormality occurrence determination unit 16 detects this change and notifies the disconnection position determination unit 9 of the change. To do. The disconnection position determination unit 9 determines that the terminal unit R ₁ is normal in the same manner as when the above-described detection request for the presence or absence of the disconnection is issued.
From the disconnection / abnormality occurrence determination unit 16 to the disconnection position determination unit 9
Will be delayed by the saturation time α from the start time of the short circuit release time T described above.

Here, the operation on the master station 7 side will be further described. When the disconnection occurs in any of the lights, the disconnection position determination unit 9 of the master station 7 disconnects the fluctuation of the output of the constant current power supply device 2 caused by the occurrence of the disconnection. The time point at which the power supply control section 8 makes the above-mentioned momentary stop after the abnormality occurrence judgment section 16 detects is the reference time point. The disconnection / abnormality occurrence determination unit 16
, L _{n for} each of the lamps L ₂ , ..., L _n , the time until the time when the fluctuation of the output of the constant current power supply device 2 due to the above-mentioned short circuit release operation is detected (that is, the measurement time) is sequentially obtained, A value is calculated by subtracting the value of the saturation time α from the obtained time value. And each of these obtained times and each light beforehand
L ₁ , L ₂ , ..., L _n corresponding to each light L ₁ , L
The determination times t ₁ , t ₂ , ..., t _n for each of L ₂ , ..., L _n are individually reacted, and if the determined time and the determination time t ₁ match, the light L ₁ Will be determined to be a broken light. Even when there is a diagnosis request for the terminal unit, it is possible to detect an abnormal terminal unit in a manner substantially similar to the above.

Next, if the lamp L ₂ is disconnected, the secondary side of the insulation transformer CT ₂ will be in a state close to an open state, and overvoltage will occur. This overvoltage is detected by the overvoltage detection unit 21 of the terminal unit R ₂ , and a detection signal indicating that an overvoltage has occurred is output to the short circuit control unit 23. When the short circuit control unit 23 receives the detection signal,
By controlling the thyristor unit 22 after a lapse of a certain cycle, the secondary side of the insulation transformer CT ₂ is short-circuited, so that the disconnection of the lamp L ₂ is not detected by the disconnection / abnormality occurrence determination unit 16. .

On the other hand, when the constant current power supply device 2 is momentarily stopped by the power supply control unit 8 in the manner as described above, the output current (first current output from the constant current power supply device 2 as shown by the dotted line portion in FIG. 11 (a)) and the output voltage (FIG. 11 (b)) become zero. When the output of the constant current power supply device 2 is instantaneously stopped by the power supply control unit 8, the current disconnection detection unit 25 provided in the terminal unit R ₂ sends a signal indicating that there is a request for detection of core disconnection. Output to the short circuit control unit 23. The short circuit control unit
When the output 23 receives the output, the thyristor unit 22 receives a predetermined determination time t ₂ from the time when the output is received.
Is controlled to release the short circuit for a time T ₁ as shown in FIG. 11 (d). In this manner, when the short circuit is released, the change in the output voltage waveform by the cross-sectional core of the lamp L ₂ (FIG. 11 (b)) is generated, the cross-sectional core / abnormality determination section 16
Detects this change by the above-described method, determines that a core disconnection has occurred, and notifies the core disconnection position determination unit 9 of the change. After the disconnection / abnormality occurrence determination unit 16 detects that the output of the constant current power supply 2 has changed due to the disconnection of the lamp L _{2 in} the same manner as described above, the disconnection position determination unit 9 detects Then, the power source control unit 8 stops the output momentarily, and then the disconnection / abnormality occurrence determination unit 16
When the count time until the time when the predetermined signal is output matches the value of the determination time t ₂ + the saturation time α, it is determined that the lamp L ₂ is disconnected. The process of determining whether or not the terminal unit R ₂ is normal is substantially the same as above. Even when disconnection occurs at multiple locations, each terminal R ₁ , R ₂ ,
It is necessary to make adjustments so that the time T ₁ for releasing the short circuit in R _n is not important.

Next, the detection operation of the lamp burnout detecting device will be described by taking as an example the case where the lights L ₁ and L ₂ are simultaneously burnt out.
When the lamp L ₁ and the lamp L ₂ are disconnected at the same time, the output of the constant current power supply device 2 fluctuates. This output fluctuation is detected by the disconnection / abnormality occurrence determination unit 16, and the disconnection position determination unit is detected. 9 is output. On the other hand, the overvoltage detection unit 21 provided in the terminal unit R ₁ and the overvoltage detection unit 21 provided in the terminal unit R ₂ simultaneously detect the overvoltage generated on the secondary side of the insulation transformers CT ₁ and CT ₂ , respectively. These insulation transformers CT ₁ ,
The secondary side of CT ₂ is short-circuited by the short-circuit portion 27 provided separately in the terminal portions R ₁ and R ₂ . Then, when the output of the constant current power supply 2 is momentarily stopped by the power supply control unit 8, the short-circuit control unit 23 of the terminal units R ₁ and R ₂ starts counting the time from that point as described above, In the section R ₁ , when the counting time reaches the value of the judgment time t ₁ + the saturation time α, on the other hand,
In the terminal unit R ₂ , the short-circuit release operation is executed when the count time reaches the value of the determination time t ₂ + the saturation time α. Thus, at the time when the counting time reaches t ₁ and the time when the counting time t ₂ is reached, the respective terminal units are
If R ₁ and R ₂ execute the short-circuit release operation for the time T _{1, the} core position determining unit 9 can recognize the occurrence of the core disconnection in the above-described manner. Therefore, the core position determining unit 9 has already been described. In the process described above, it is possible to determine that the lights L ₁ and L ₂ are disconnected. The same applies to the determination as to whether the terminal units R ₁ and R ₂ are normal.

Here, the length of the determination time t ₂ is t ₁ + T + T _X (where T _X is the time shown in FIG. 11 (c), which is the recovery time of the disconnection / abnormality occurrence determination unit 16). Greater than. This prevents the times T for releasing the short circuit from overlapping even when disconnection occurs at a plurality of locations. Therefore, the time t ₃ corresponding to the light L ₃ is t ₃ > t ₂ + T + T _X , the light L _n
The time t _n corresponding to is t _n > t _n-1 + T + T _X.

As described above, according to the lamp burn-out detection device according to the embodiment of the present invention, it is possible to accurately determine which lamp has burned out, and therefore the worker discovers the burned-out fire. Therefore, it is not necessary to carry out a patrol inspection of the runway in order to significantly improve the efficiency of maintenance and inspection work. In this case, the constant current power supply device 2 performed by the power supply control unit 8
By shortening the cycle of the instantaneous stop of the output of, it is possible to detect the lamp in which the core is broken in a short time after the core is broken. In addition, even if a disconnection occurs in each of the lights L ₁ , L ₂ , ..., L _n , the secondary side of the insulation transformer CT ₁ , CT ₂ , ..., CT _n is short-circuited to disconnect the core. Since the secondary side of the insulation transformers CT ₁ , CT ₂ , ..., CT _n of normal lighting is short-circuited for a short time T at regular intervals, the condition is the same as when it is not occurring. It is possible to avoid generation of high voltage on the secondary side of the insulation transformers CT ₁ , CT ₂ , ..., CT _n over time. Therefore, it is possible to prevent a short circuit between windings in the insulation transformers CT ₁ , CT ₂ , ..., CT _n and a burnout due to a temperature rise.

Further, even if any of the terminal ends R ₁ ~ R _n is abnormal, the short-circuit control unit 23 of the terminal unit does not short-circuit, and even if the lamp corresponding to this terminal unit is disconnected, This does not make it impossible to detect the disconnection of the remaining lights.
Even when an abnormality occurs in any of the terminal units R1 to Rn in this way, the power supply control unit 8 instantaneously stops the output of the constant current power supply device 2 for a predetermined cycle, thereby short-circuiting the remaining terminal units. The control 23 operates the thyristor unit 29 when the corresponding lamp is not cored, and operates the thyristor unit 22 when the corresponding lamp is cored, thereby causing a pseudo core disconnection state for a predetermined period of time. By closing the thyristor unit 22 until the judgment time elapses and releasing the closing for a short time after the judgment time elapses, the disconnection position judgment unit 9 side can be notified of the normal terminal unit. That is, in the normal terminal portion, the thyristor portion 22 in the normally open state and the thyristor portion 29 in the normally closed state are controlled as described above to temporarily generate the pseudo disconnection state, and thus the time integration of the voltage waveform is performed. While the fluctuation of the value is recognized, if the corresponding lamp is disconnected and the terminal itself is abnormal, the time-integrated value of the high voltage waveform is always output and the change is not recognized. is there.

Next, another embodiment according to the present invention will be described. Another embodiment according to the invention is a terminal R ₁ , R ₂ ,
..., R _n (Fig. 2) is a modification of the configuration contents,
Shown as terminal unit RR _{1 in the} figure. Terminal section R ₁ shown in FIG.
In the above, the overvoltage detection unit 21 is used as the open state detection means, and the overvoltage detection unit 21 detects the overvoltage generated on the secondary side of the insulation transformer CT ₁ so that the lamp L ₁ is disconnected. Had been detected. On the other hand, in this terminal unit RR ₁ , the fact that the current flowing through the lamp L ₁ is cut off due to the occurrence of core disconnection is passed through the current transformer 41, which is an open state detection means connected in series to the lamp L _1. The difference lies in that the lamp current detector 42, which is an open state detector, detects that the lamp L ₁ is disconnected.
Except for detecting the occurrence of core disconnection in the lamp L ₁ in this manner, it is exactly the same as the lamp core disconnection detection device according to the above-described embodiment.

It should be noted that the above-described embodiments are all embodiments according to the present invention, and do not mean that the lamp burnout detecting device according to the present invention is limited to the above-mentioned two embodiments. For example a short circuit, in the above two embodiments, as a means for short-circuiting the secondary side of the isolation transformer CT ₁ to CT _n, in the above two embodiments is used thyristor but, by opening and closing of its contacts with the relay Other means such as opening / opening may be used. Further, it is not always necessary to automatically perform the disconnection position determination operation or the like by the disconnection position determination unit 9 at regular intervals, and therefore, it is necessary to frequently perform the instantaneous stop of the output of the constant current power supply device 2 by the power supply control unit 8. Not necessarily. For example, the output may be momentarily stopped every few hours for a few minutes at intervals of a few minutes, and when the operator wants to detect the disconnection of the lamp, the output is instantaneously performed by a manual operation. It may be a stop.

In the two embodiments described above, the output of the constant current power supply 2 is instantaneously stopped by the power supply controller 8 by setting both the output voltage and the output current from the constant current power supply 2 to zero. However, in general, the constant current power supply device 2 is provided with a power supply unit for lighting the lamp and a power supply unit for supplying a base current for obtaining a time integrated value at the time of core disconnection, so that only the power supply unit for the light is output. Alternatively, the output of the base power source unit may be set to 0 and not set to 0.
The waveforms of the output voltage and the output current during the instantaneous stop of the output in this case are as shown in FIG.

〔The invention's effect〕

As described above, according to the present invention, the pulsed voltage values of the AC power supply output are sequentially input, and this voltage value,
The lamp burnout judgment reference value, which is determined from the voltage value input during the specified period before the input of this voltage value, is compared, and if the difference between the two is larger than the expected range, it is determined that the burnout has occurred, and the AC power supply The time from the moment when the output is instantaneously stopped to the time when the disconnection judging means detects the operation is counted and compared with the judgment time that is set to a different value for each lamp, and the judgment time that matches this count time is set. Since it was decided to distinguish the lamps that were burned, even if one of the multiple lamps was disconnected and an abnormality occurred in the corresponding terminal, one of the lamps corresponding to the other normal terminals was disconnected. It is possible to provide a lamp burnout detecting device capable of detecting this burned out lamp when the above.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a lamp burnout detecting device according to an embodiment of the present invention, FIG. 2 is a block diagram showing a configuration of a terminal portion of the device, and FIG. 3 is according to the present invention. FIG. 4 is a block diagram showing a configuration of a terminal unit according to another embodiment.
FIG. 5 is a flowchart showing a process of setting a lamp burn-out determination reference value by reading a time integral value of a voltage waveform according to the lamp burn-out detection device according to one embodiment of the present invention, and FIG.
6 is a timing chart showing changes in output voltage and current waveform of a constant current power supply device according to another embodiment according to the present invention, FIG. 6 is a block diagram showing a configuration of a light core breakage detection device according to the prior art, and FIG. Explanatory diagram showing changes in output voltage and current waveform of constant current power supply device due to core generation, FIG. 8 is an explanatory diagram showing relationship between time integral value of output voltage of constant current power supply device and number of broken lamps FIG. 9 is a block diagram showing a configuration of a light core breakage detecting device according to a prior art of the present invention, and FIGS. 10 and 12 are block diagrams showing configurations of a terminal unit according to the prior art of the present invention, respectively. , Fig. 11 is Fig. 1,
A change in the output voltage and the current waveform of the constant current power supply device in the lamp burnout detection apparatus shown in FIG. 9, a burnout detection signal from the burnout / abnormality occurrence determination unit (or the burnout occurrence determination unit),
It is a timing chart which showed the short circuit signal of a short circuit control part. 1 ... AC power supply, 2 ... Constant current power supply device, 3, 26, 41 ...
Current transformer, 4 …… Transformer, 5,66 …… Series lighting circuit, 65 ……
Disconnection detection unit, 6 ... Disconnection occurrence determination unit, 7 ... Master station, 8 ...
… Power supply control unit, 9… Disconnection position determination unit, 10… Voltage waveform counting unit, 11… Reference value automatic setting unit, 12… Current waveform counting unit, 13… Tap-based reference value setting unit, 14 …… Core disconnection determination unit, 15 …… System abnormality determination unit, 16 …… Disconnection / abnormality occurrence determination unit, 21 …… Overvoltage detection unit, 22,29 …… Thyristor unit, 23 …… Short-circuit control unit, 24… … Time setting part, 25 …… Current disconnection detection part, 27 …… Short circuit part, 31 …… Delay circuit, 42 …… Lighting current disconnection detection part, R ₁ , R ₂ ,…, R _n …… Terminal part, LT ₁ , LT ₂ , ..., LT _n ...... Light, C
T ₁ , CT ₂ , ..., CT _n …… Insulation transformer.

Continuation of the front page (56) Reference JP-A-55-139795 (JP, A) JP-A-1-274388 (JP, A) JP-A-3-145096 (JP, A) JP-A-2-215087 (JP , A) JP-A-3-64889 (JP, A) JP-A-3-194898 (JP, A) JP-A-2-226693 (JP, A) JP-A-2-226695 (JP, A) 57-168198 (JP, U) JP-B 52-11023 (JP, B1) JP-B 52-11024 (JP, B1) JP-B 61-15556 (JP, B2)

Claims (2)

(57) [Claims] Claim: What is claimed is: 1. A lamp burn-out detection device for a series lighting circuit, comprising a lighting circuit on each of the secondary sides of two or more transformers connected in series to a constant current type AC power source. AC power supply control means that controls the output of the AC power supply to stop momentarily for a set time within a range that does not hinder lighting, and that the secondary side of the corresponding transformer provided for each lamp is in an open state The open state detection means for detecting the, and for each lighting, when there is a momentary stop of the AC power output after the transformer secondary side is short-circuited due to the open state detection of the transformer secondary side, Short-circuit control means for releasing the short-circuit for a certain period of time after a set judgment time has elapsed, sequentially inputting a pulsed voltage value of the AC power supply output, this voltage value, and a predetermined period before the input time point of this voltage value The electric power input to A lamp burnout determination reference value determined from the pressure value is compared, and if the difference between the two is greater than the expected range, a burnout determination means for determining burnout occurrence, and a different determination time for each of the lights are set. Therefore, the time from the momentary stop of the AC power supply output to the detection operation time of the disconnection judging means is counted and compared with each of the judgment times, and the judgment time is set to coincide with this counting time. A lamp disconnection detecting device, comprising: a lamp determining unit for determining a lamp. 2. The lamp burnout detecting device according to claim 1, wherein the burnout determination reference value is compared with a preset system abnormality determination reference value, and if the difference between the two is larger than a predetermined range, the system is determined. A lamp burnout detection apparatus, comprising a system abnormality determination unit that determines an abnormality.