JP3146017B2 - Light core break detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lamp burnout detecting device for detecting burnout of a lamp connected to a secondary side of a plurality of insulated transformers connected in series.

[0002]

2. Description of the Related Art A series lamp lighting circuit is used to turn on a number of lamps used for guidance on an airport runway. The series lamp lighting circuit is provided with a lamp disconnection detecting device that detects that any of the lamps has become disconnected.

[0003] The most common configuration of such a lamp disconnection detecting device is such that a primary side of a plurality of transformers is connected to a constant current type AC power supply, and a plurality of lamp lighting circuits are connected to a secondary side. Things. Then, when each lamp in each lamp lighting circuit is disconnected, an overvoltage caused by the disconnection is detected to short-circuit the secondary side, and the output waveform of the AC power supply when the short-circuit is released after a predetermined time has elapsed. On the basis of this, it is detected that the lamp has become disconnected.

However, in such a conventional apparatus, it is possible to detect that one of the plurality of lamps is out of focus, but it is not possible to detect which of the plurality of lights is out of center. I have.

[0005] Recently, for example, Japanese Patent Application No. Hei 2-2713 has been proposed.
As in the device disclosed in Japanese Patent No. 93, there has been proposed a device capable of detecting not only the number of broken lights but also which of the broken lights and the arrangement position thereof. I have.

[0006] The outline of this proposal is as follows. First, terminals are provided for each lamp, and the time for determining whether or not the terminal is a broken lamp is set differently for each lamp. . Then, the time from when the AC power output is controlled by the AC power control means provided in the master station to when the release operation determining means provided in the master station detects a change in the AC power output is counted. At the same time, each determination time is made to correspond to each count time, and among these determination times, the corresponding count time is determined, and the lamp corresponding to the determined determination time is determined to be the burnout lamp. .

[0007]

SUMMARY OF THE INVENTION The above proposal makes it possible to detect not only the number of broken lights but also the type of broken light, thereby speeding up maintenance work such as replacement of lights. Now you can do it.

[0008] By the way, as described above, the technology for identifying a cored lamp from a plurality of lamps has been repeatedly improved because the number of lamps is extremely large (usually several thousand or more). It is virtually impossible to lay a cable such as a control line between the master station and each terminal. (If such a cable is available, the terminal By transmitting a failure signal or the like from the device to the master station, the broken light can be easily specified.)

That is, in the conventional apparatus, with respect to information transmission between the master station and the plurality of terminals, a failure (disconnection) occurring in any of the plurality of terminals.
Only the signal is detected by the master station, and it is impossible to send any signal from the master station to each terminal.

However, in order to more reliably or promptly specify the burnout lamp, it is preferable that the master station can transmit some information to each terminal. In addition, if such information transmission becomes possible, it is possible to expect improvements in various technologies other than the technology for specifying the broken lamp.

The present invention has been made in view of the above circumstances, and it is possible to identify a broken light from among a large number of lights, and further, an information signal is transmitted from the master station to each terminal. It is an object of the present invention to provide a device for detecting a core disconnection of a lamp.

[0012]

According to the present invention, as a means for solving the above-mentioned problems, a primary side of a plurality of transformers is connected to a constant current type AC power supply, and a plurality of lamps are connected to a secondary side thereof. A plurality of terminals for detecting the respective deficiencies of the plurality of lights are connected to a plurality of terminals, and a light deficiency detecting device having a master station for identifying the deficient lights from the plurality of lights is provided. A disconnection occurrence determination that is provided on the master station side and determines that disconnection has occurred in any of the plurality of lights by detecting distortion of an output voltage waveform of the constant current type AC power supply. Means, provided on the side of the master station, wherein a section of a predetermined number of cycles of the output current waveform is 1 bit.
The digital information of a predetermined number of bits is constituted as a section of
Moreover, at a predetermined position in the section of the predetermined number of cycles,
Power control means for adding this digital information to the output current waveform by controlling the presence or absence of one half-wave portion ;
Digital information detection means provided on each terminal side for detecting the added digital information from the output current waveform of the constant current type AC power supply; When an overvoltage or a current interruption occurring on the secondary side of the transformer is detected, the secondary side of the transformer is short-circuited.Furthermore, after the digital information detecting means detects predetermined information, it is determined in advance for each terminal. Short-circuit means for canceling the short-circuit when the reference time has elapsed, and a short-circuit means provided on the master station side, wherein the short-circuit means cancels the short-circuiting from the point in time when the power supply control means adds the digital information. By comparing the time until the determination means detects the distortion of the output voltage waveform with the reference time, a disconnection position determining means for identifying a disconnected light from the plurality of lights and Characterized by comprising a.

[0013]

In the above arrangement, if any of the lamps is broken, the output voltage waveform of the constant-current type AC power supply is distorted. The disconnection occurrence determination means determines the occurrence of the disconnection by detecting the distortion. At this time, in the terminal device related to the broken lamp, the overvoltage or the current interruption occurring on the secondary side of the transformer is detected, and the short-circuit means short-circuits the secondary side of the transformer. This prevents the voltage from being left.

When the occurrence of the disconnection is determined, the power supply control means outputs the digital information to the output current waveform of the constant current type AC power supply.
Is added. That is, the predetermined number of cycles of the output current waveform
A section of a predetermined number of bits is defined as a section of 1 bit.
Information within the interval of the predetermined number of cycles.
The presence or absence of one half-wave portion at a given position
Digital information on the output current waveform
I do. The power supply used in the present invention is of a constant current type.
The output current waveform is constant, so the output current waveform
Digital information by changing a part of
Can be The change in this case is
It's as simple as whether to delete one of the half-waves
Therefore, the control can be easily performed. Ma
Too many parts to carry digital information
The brightness of the lamp will change if the waveform of
However, in the present invention, the number of cycles
Since only one half-wave part is deleted,
No problem.

In each terminal, the digital information detecting means detects the added digital information, and the short-circuit means releases the short-circuit when a reference time set for each terminal elapses after the detection. .

[0016] When the terminal device related to the burnout lamp releases such a short circuit, the output current waveform of the constant-current type AC power supply suffers the same distortion as when the burnout occurs.

The disconnection position determining means compares the time from the time when the power supply control means adds the digital information to the time when the disconnection occurrence determining means detects the distortion with each reference time, and determines which lamp is Identify whether the core has been cut.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a block diagram showing a configuration of a center-loss detecting device according to this embodiment.

The current from the AC power supply 1 is supplied to a constant current power supply 2
Is supplied to the lamp lighting circuit 5 while being kept constant by the phase control. Thus, the insulating current transformer connected in series with lamp lighting circuit within _{5 CT 1, CT 2, ...} , lights respectively connected to the secondary side of the _{CT n L 1, L 2,} ..., L n
Is maintained constant.

The output current and output voltage of the constant current power supply 2 are input to the master station 6 via the current transformer 3 for the instrument and the transformer 4 for the instrument. Each lamp L _1, L _2, ..., the L _n, the terminal device R ₁ for detecting the sectional core, R _2, ..., R _n are connected.

As shown, the master station 6 has a disconnection occurrence determining means 7 and a disconnection position determining means 8, and further has a power control means 9 including a digital code generating section 9a therein. I have.

The disconnection occurrence judging means 7 comprises a constant current power supply 2
The distortion of the output waveform, lights L _1, L _2, ..., intended to determine the Dancing has occurred in one of L _n, the determination result in Dancing position determining means 8 and the power supply control means 9 Output.

The power control means 9 controls the output of the constant current power supply 2 and can transmit a digital code from the digital code generator 9a. The digital code can be transmitted on condition that the disconnection occurrence determining means 7 determines that the disconnection has occurred or at an arbitrary timing.

The decentering position judging means 8 stores different reference times t ₁ , t ₂ ,..., T _n for each lamp, and the decoupling position after the signal is inputted from the power control means 9. The position of the broken lamp is specified by comparing the time until the signal is input from the occurrence determination means 7.

Next, the configuration of the terminals R ₁ , R ₂ ,..., R _n will be described. Since the configuration of these terminals R ₁ , R ₂ ,..., R _n is the same, the terminal R ₁ will be described as an example with reference to FIG.

In FIG. 2, a lamp L ₁ is connected to the secondary side of the insulation current transformer CT ₁ , and the short-circuit means 11 and the overvoltage detecting section 21 are connected in parallel with the lamp L ₁ . . The secondary side of the insulating current transformer CT ₁ is also digital information detecting unit 25 via the current transformer 28 is also connected.

[0027] Of the overvoltage detector 21 which detects this when an overvoltage occurs on the secondary side of the lights L ₁ is insulated current transformer and Dancin CT _1, and outputs a detection signal to short circuit controller 23 And has a high impedance so that a constant current does not flow.

The short-circuit means 11 includes a thyristor section 22 for short-circuiting the secondary side of the insulation current transformer CT ₁ and a time setting section 24 for setting a time t corresponding to the reference time until the short-circuit is released. After this time has elapsed, for a certain time T,
And a short-circuit control unit 23 that controls the thyristor unit 22 to release the short circuit. The time set in the time setting unit 24 is determined by each of the terminals R ₁ , R _{2 ,.}
Each has a different length such as t ₁ , t ₂ ,..., T _n .

The digital information detecting unit 25 is for detecting a digital code from a change in the waveform of the secondary side of the output voltage of the insulated current transformer CT _1.

Next, the operation of the disconnection detecting device having such a configuration will be described with reference to the time chart of FIG. First, lights L ₁ is When the Dancing, overvoltage in a state close to the secondary side freed insulating current transformer CT ₁ occurs. The overvoltage detecting overvoltage detection unit 21 of the terminal unit R ₁ notifies that the overvoltage has occurred a short circuit control unit 23.

Upon receipt of this notification, the short-circuit control unit 23 outputs a short-circuit signal after a lapse of time T ₀ (scheduled waiting time), drives the thyristor unit 22, and drives the thyristor unit 22 to operate on the secondary side of the insulation current transformer CT _1. It was short, lighting L ₁ is a state where the secondary side when the same state or insulating current transformer CT ₁ which is not Dancing is not released.

During this time T ₀ , since the short circuit has not occurred since the short circuit has occurred, the output voltage waveform changes as shown in FIG. It is determined that a lead has occurred, and a lead detection signal as shown in FIG. In this case, there is a delay of the saturation time α from the occurrence of the disconnection to the output of the detection signal, and the delay time T _x from the start of the short circuit to the end of the disconnection detection signal. Exists.

The power control means 9 which has been notified that the disconnection has occurred is sent from the digital code generator 9a a digital code for changing the output waveform of the AC power supply 2.

Digital information detecting means 25 of terminal R ₁
Detects this digital code and notifies the time setting unit 24 of the detection. Upon receiving this notification, the time setting unit 24 starts counting the time t corresponding to the lamp L ₁ , and after the time t ₁ has elapsed, the short-circuit control unit 23 causes the thyristor unit 22 to short-circuit for a certain period of time t. Release.

As a result, the short-circuit signal is turned off only for a predetermined time T as shown in FIG. The reason why such an operation is performed after changing the output waveform is to synchronize the timing of starting counting with a different time t for each lamp with the timing of starting a one-cycle waveform.

[0036] Since a change in the short circuit is canceled lamp L ₁ of the cross-sectional core by the output voltage waveform (FIG. 3 (b)) occurs, the cross-sectional core occurrence determination unit 7 detects this change by time integration technique such as Then, it is determined that the centering has occurred, and the centering position determining means 8 is notified.

The disconnection position determining means 8 obtains the time from when the power control means 9 sends out the digital code to when the disconnection occurrence determining means 7 determines that the disconnection has occurred. The value obtained by subtracting the time α is calculated. Then, it is determined by comparison whether this time matches any of the previously stored reference times t ₁ , t ₂ ,..., T _n corresponding to the respective lamps, and if it matches t _1. It determines that the lamp L ₁ has been Dancin '.

[0038] If the lights L ₂ is Dancin ', the short-circuit control unit 2
The cancellation of the short circuit performed in 3 is performed after a time t ₂ set in the time setting unit 24 has elapsed after the transmission of the digital code from the master station 6.

[0039] Then, as in the case of lights L _1, the cross-sectional core position determining means 8 from the time the power source control unit 9 has sent a digital code to change the output waveform, the cross-sectional core occurrence determination means 7 cross wick occurs Find the time until it is determined that
When it is confirmed that the value obtained by subtracting the saturation time α from the time t ₂ matches the time t _2, it is determined that the light L ₂ has been disconnected.

Here, the length of the time t ₂ is t ₁ + T
+ T _x (where T _x is shown in FIG. 3C and is a return time of the decentering occurrence determining means 7). In this way, even when the disconnection occurs at a plurality of locations, the respective times T when the short circuit is released are prevented from overlapping. Similarly, the time t ₃ when corresponding to lights L ₃ is _{t 3> t 2 + T +} T x , and the time corresponding to the lamp L _n t _n is the _{t n> t n -1 + T} + T x.

As described above, by setting the respective times t, even when a plurality of lights are disconnected, it is possible to detect the disconnection. For example, if the lights L ₁ and lights L ₂ is Dancin simultaneously, firstly, the terminal unit R _1, insulating current transformer in R ₂ CT _1, shorting CT ₂ of the secondary side, respectively. After the transmission of the digital code by the power supply control means 9 to both of them simultaneously, the time t
₁ and t _2, and then the short circuit is released for a time T in a non-overlapping time zone.

[0042] Thus the cross-sectional core position determination means 8, the change in the output waveform is compared with the time and the stored time t to the cross-sectional core is detected, both of the lights L ₁ and lights L ₂ is the cross-sectional It can be determined that it is cored.

Further, even when two or more lights are disconnected at short intervals, the digital code is output from the power supply control means 9 a plurality of times, and the discrimination in the disconnection position determination section 9 is performed accordingly. Is performed a plurality of times, and the result of the majority matching is used as the detection result, whereby the detection accuracy can be improved. In this case, by setting the period for transmitting the digital code to be longer than the longest time t among the times t corresponding to the lights, it is possible to prevent the time T for releasing the short circuit from being overlapped. The detection accuracy of the center position can be further improved.

Next, the contents of the digital code added to the output current waveform of the constant current power supply 2 by the digital code generator 9a of the power supply control means 9 will be described.

FIG. 4 shows an example of a digital code constituting one word area with an 8-bit length, for example. In this example, three bits of the output current waveform represent one bit, and when there is a leading half-wave portion, the logical value is “1”.
If there is no such value, the logical value is “0”.

Using such a digital code,
For example, the positions of 256 lights or terminals can be represented, and individual diagnosis can be performed for each light or each terminal. Therefore, it is possible to shorten the detection time of the occurrence of the disconnection and to improve the detection accuracy.

Further, since other information can be transmitted from the master station to each terminal by using the digital code, improvement can be expected in various controls.

Since the power supply output is used as it is as the information transmission means, there is no problem in implementation and the cost is advantageous. Further, even if control is performed to delete a certain half-wave portion of the output current waveform, only one half-wave portion in three cycles is performed, and not all bits are set to “0”. The half-wave portion to be deleted is minute when viewed from the entire output. Therefore,
There is no problem with the brightness aspect of the lamp.

The above-described embodiments are merely examples, and do not limit the apparatus for detecting a core disconnection of a lamp according to the present invention. For example, an insulated current transformer is used as a transformer,
The invention can be applied to a series lighting circuit using a transformer. In the embodiment, a thyristor is used to short-circuit the secondary side of such a transformer. However, a thyristor is used to open and close the contact using a relay, and a short-circuit is established by other means. Is also good.

[0050] Incidentally, the sectional core position determination unit 8 in FIG. 1, and the time setting unit 24 in FIG. 2, the reference time t _1, t _2, ..., when performing the measurement of t _n, the digital code to the output current waveform The measurement is performed from the time when is added. In other words, this digital code serves as a signal that determines the measurement start time of the reference time,
It serves both as a signal for information transmission. Therefore, if only the role of determining the measurement start time is sufficient, it is possible to adopt a configuration that fulfills this role by another method without attaching a digital code to the output current waveform.

Therefore, it cannot be said that this is an embodiment of the present invention.
A configuration for changing the phase of the output current waveform is also described.

That is, the power supply control means 9 in FIG.
Has a function of changing the phase of the output current waveform of the constant current power supply device 2, and changes the phase when the disconnection occurrence determination means 7 determines that disconnection has occurred in any of the lights. To do.

For example, on the terminal RR ₁ side, FIG.
As shown in (2), the time setting unit 24 starts counting the reference time t _{1 when} the current phase change detection unit 30 detects this phase change via the current transformer 29. FIG. 6 is a time chart showing the waveform of each signal when the phase is changed as described above.

In the terminal device R ₁ shown in FIG. 2, when the overvoltage detector 21 detects an overvoltage generated on the secondary side of the insulation current transformer CT ₁ , the short-circuit controller 23 short-circuits the thyristor 22. Was performed. In contrast, FIG.
In the terminal unit RR _1, the current interruption of the lamp L _1, when the current interruption detection unit 27 detects via the current transformer 26 connected in series to the lamp L _1, short circuit control unit 23 to thyristor 22 Short-circuit operation is performed. Therefore, FIG.
It is of course possible to use the current transformer 26 and the current interruption detection unit 27 in FIG. 5 instead of the overvoltage detection unit 21 in FIG.

[0055]

As described above, according to the present invention, the power supply
The control means determines a predetermined size of the output current waveform of the constant current type AC power supply.
A section of the number of bits is defined as a 1-bit section,
Digital information, and this predetermined number of cycles.
Controls the presence or absence of one half-wave at a predetermined position in the section
Digital information to the output current waveform.
And the time at which the digital information is detected
And the start of reference time measurement on the terminal side.
In addition to being able to identify a broken light from among the lights,
Various information can be sent from the station to each terminal.
In this case, more advanced control can be performed. And
Waveform part changed to add digital information
Is only one half-wave part of the predetermined number of cycles,
There is no problem with the brightness of the lamp.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a terminal in FIG. 1;

FIG. 3 is a time chart for explaining the operation of FIGS. 1 and 2;

FIG. 4 is an explanatory diagram relating to a waveform of a digital code section in FIG. 3;

FIG. 5 is a block diagram showing a modification of FIG. 2;

FIG. 6 is a time chart for explaining the operation of FIG. 5;

[Explanation of symbols]

2 Constant current type AC power supply (constant current power supply device) 6 Master station 7 Disconnection occurrence determination means 8 Disconnection position determination means 9 Power supply control means 11 Short circuit means 21 Overvoltage detection unit 25 Digital information detection means 27 Current disconnection detection unit L ₁ ~ L _n lamp CT ₁ ~ CT _n transformer (insulated current transformer) R ₁ ~ R _n terminal

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masafumi Omura 66-2 Horikawa-cho, Saiwai-ku, Kawasaki-shi, Kanagawa Prefecture Toshiba Engineering Corporation (56) References JP-A-2-226694 (JP, A) (58) ) Surveyed field (Int.Cl. ⁷ , DB name) H05B 37/03

Claims (1)

(57) [Claims] A primary side of a plurality of transformers is connected to a constant current type AC power supply, and a plurality of lamps and a plurality of cores for detecting disconnection of each of the plurality of lamps are provided on the secondary side thereof. A terminal disconnection detection device having a master station for identifying a cored lamp from among the plurality of lamps, provided on the master station side, the output of the constant current type AC power supply. Disconnection occurrence determining means for detecting that disconnection has occurred in any of the plurality of lamps by detecting distortion of the voltage waveform, and provided on the master station side, a predetermined cycle of the output current waveform. number
A section of a predetermined number of bits is defined as a section of 1 bit.
Information within the specified number of cycles
The presence or absence of one half-wave portion at a given position
Accordingly, a power supply control means for adding the digital information to the output current waveform, the provided in each terminal unit side, the digital information detecting means for detecting the constant current AC source the appended digital information from the output current waveform of the Provided on each of the terminal units, and upon detecting an overvoltage or a current interruption occurring on the secondary side of the transformer associated with the burnout lamp, short-circuits the secondary side of the transformer, and further comprises detecting the digital information. A short-circuit means for canceling the short-circuit when a predetermined reference time elapses for each terminal after the means has detected the predetermined information; and a short-circuit means provided on the master station side, wherein the power control means includes the digital information. Is added to the reference time by comparing the time from when the short-circuiting means releases the short-circuiting means to when the disconnection occurrence determining means detects the distortion of the output voltage waveform. , Lamplight sectional core detecting device characterized by comprising a, the cross-sectional core position determination means for identifying Dancing the lights from the plurality of lighting.