JP2760661B2 - Light core position detection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a series lamp lighting circuit comprising a plurality of current transformers each having a primary side connected in series to a constant current type AC power supply, and a secondary side connected to each of the lamps. The present invention relates to a light-offset position detecting device that detects a light-off position when a light-off occurs.

[0002]

2. Description of the Related Art A series lamp lighting circuit of this kind is used for lighting a runway of an airport. The series lamp lighting circuit is provided with a disconnection position detecting device for detecting which of the multiple lamps is disconnected, that is, the disconnection position.

As a typical example of a conventional centering position detecting device, a terminal unit for detecting centering for each lamp and controlling opening and closing of a secondary side of a current transformer is provided. Some include a disconnection detection unit that detects disconnection of a lamp from a change in the output voltage waveform of an AC power supply, and a master station that determines a disconnection position based on the output of the disconnection detection unit. Was. The schematic operation of this centering position detecting device will be described as follows.

[0004] First, when disconnection occurs in any of a large number of lamps, the secondary side of the current transformer to which this lamp is connected is opened, and the output voltage waveform and output current waveform of the AC power supply are changed. Changes. The disconnection occurrence detection section on the AC power supply side detects the occurrence of disconnection from these waveform changes.

[0005] Next, when the disconnection occurrence detecting section detects the occurrence of disconnection, the master station momentarily stops the output of the AC power supply for a time that does not hinder lighting of the lamp.

On the other hand, the terminal unit corresponding to the lamp in which the disconnection has occurred detects the disconnection of the lamp, and the time required for the disconnection detection unit to determine that the disconnection has occurred, that is, a fixed state holding time After the passage of T _s, the secondary side of the current transformer is short-circuited. When the instantaneous stop of the output of the AC power supply is detected, a certain signal is generated after a lapse of the determination time τ _n (n = 1, 2, 3,...) Of the centering position assigned to the lamp from the instantaneous stop. The short circuit is released for a time T (T <τ _n ).

At this time, the disconnection detecting section detects the occurrence of the disconnection again.

[0008] On the other hand, the master station judges a fired lamp from the time difference between the moment when the AC power supply output is momentarily stopped and the moment when the dead center is detected by the dead center detector after the momentary stop.

Here, if a plurality of lights are disconnected, the disconnection occurrence detecting section sequentially outputs a disconnection occurrence signal. Therefore, the master station counts the time from the momentary stop and outputs the disconnection detection signal. The position was detected.

[0010]

In the [0008] lighting sectional core position detecting device described above, and if the lighting is held only open state retention time of the secondary side of the transformer and the cross-sectional core T _s, the terminal The output waveform of the AC power supply changes in the same manner as in the case where the short circuit on the secondary side of the transformer is released for the signal generation time T in order for the section to generate a signal. In response to this change, the disconnection occurrence detecting section outputs a disconnection occurrence signal, and the master station detects the disconnection position based on the time of occurrence of the disconnection occurrence signal.

For this reason, if another lamp is disconnected while the short-circuit of the terminal is released, or if another lamp is disconnected after the short-circuit of the terminal is released, a new disconnection occurs. Sometimes I missed the light.

Further, if another lamp is disconnected immediately before the terminal section is released from the short circuit, the position of the previously disconnected lamp may be erroneously determined and the disconnected lamp may be missed later in time. .

The present invention has been made in order to solve the above-mentioned problem. Even when the short-circuit of the terminal section is released, or when the short-circuit occurs before and after the short-circuit clearing operation, the fired lamp is viewed. It is an object of the present invention to provide a lamp disconnection position detecting device that can detect a disconnection position accurately without escape.

[0014]

SUMMARY OF THE INVENTION The present invention relates to a lamp cutoff detecting a core disconnection position of a lamp connected to a secondary side of a plurality of current transformers whose primary sides are connected in series to a constant current type AC power supply. In the core position detection device, the secondary side of the current transformer is provided for each of the lights, short-circuits the secondary side of the current transformer after a certain state holding time by detecting the core of the corresponding light, and from the momentary stop of the AC power supply. A terminal unit that releases the short circuit until a certain signal generation time elapses from the time when the decentering position determination time individually set for each lamp has elapsed, and the output voltage waveform of the AC power supply is monitored, and the output voltage waveform is monitored. The AC power supply is provided on the condition that the disconnection of the light is detected from the change in the disconnection, and a disconnection detection unit that generates a signal corresponding to the number of the disconnection lights, and that the disconnection detection unit detects the disconnection. Power supply control unit for instantaneously stopping the output of the AC power supply For each momentary stop of the force, the center position of the lamp is detected based on the time difference between the momentary stop point and the center line detection point of the center line detector, and based on the output signal of the center line detector, the lamp is disconnected. And a master station having a disconnection position discriminating unit for performing the instantaneous stop operation of the power supply control unit by judging the overlap and continuity of the lead and performing the detection processing of the disconnection position of the light again. Is what you do.

Here, _assuming that the state holding time is T _s , the decentering position determination time is τ _n (n = 1, 2,..., N), and the signal generation time is T, the following equation T <T _s <it is convenient to make to have a relationship of tau _n cutlet T + T _s <τ _n.

[0016]

In the present invention, the disconnection detecting section detects the disconnection of the light and outputs a signal corresponding to the number of the disconnected lights. The disconnection position determining unit detects the disconnection position of the lamp based on the time difference between the instantaneous stop of the AC power output and the detection of the disconnection, and judges the overlap and continuity of the disconnection of the lamp and stops the power control unit instantaneously. In addition to performing the operation, the process of detecting the decentered position of the lamp is performed again, so even if the decentering occurs during the termination of the short circuit of the terminal unit, or before or after the short circuit release operation, the deactivated lamp is Can be detected without fail, and the centering position can be accurately detected.

In this case, the state holding time is T _s , the decentering position determination time is τ _n (n = 1, 2,..., N), and the signal generation time is between T and T <T _s <τ _n and By making the relationship of T + T _s <τ _n , it is possible to reliably determine the overlap and continuity of the lamp disconnection.

[0018]

FIG. 1 is a block diagram showing the overall configuration of an embodiment of the present invention. In the figure, a constant current is supplied to a series lighting circuit 5 from a constant current power supply 2 connected to an AC power supply 1. The series lighting circuit 5 includes current transformers CT ₁ , CT ₂ ,..., CT _n whose primary sides are connected in series, and lamps L ₁ , L _{2 ,.} With such a configuration, the brightness of each lamp is kept constant. Also, on the secondary side of the current transformers CT ₁ , CT ₂ ,..., CT _n , the disconnection of the lamp is detected, the circuit is short-circuited after the elapse of the state holding time T _s , and the AC power supply is momentarily stopped. The decentering position determination time τ _{n that} differs for each lamp
After the lapse of (n = 1, 2,..., N), terminals R ₁ , R ₂ ,..., R _n for releasing the short circuit for a fixed signal generation time T are connected.

On the other hand, a current transformer 3 and a transformer 4 are provided on the output path of the constant current power supply device 2, and the disconnection detecting section 6 detects the disconnection based on each output signal waveform, and detects the disconnection of the disconnection lamp. A signal corresponding to the number is given to the master station 7. The master station 7 includes a power control unit 8 and a centering position determining unit 9. When the power control unit 8 receives the disconnection signal, the power control unit 8 momentarily stops the output of the constant current power supply device 2 for a time that does not hinder lighting of the lamp (for example, one cycle time) (hereinafter, referred to as instantaneous stop). It is to let. Further, the centering position determining section 9 determines the centering position detection time τ _1n , t which differs for each lamp.
_2n ,..., T _nn are stored, and this is compared with the arrival time of the signal obtained from the decentering detection unit 6 to determine the position of the decentered lamp. The determination is made to cause the power supply control unit 8 to perform the instantaneous stop operation, and to perform the detection processing of the centering position again.

The terminal units R ₁ , R ₂ ,
..., since the internal structure of the R _n are the same either, a detailed configuration with reference to FIG. 2 as an example the terminal unit R _1.
The secondary side of the current transformer CT _1, so that in parallel with the overvoltage detecting section 21 and the short circuit portion 27 is connected to the lamp L _1, further current transformer via a current transformer 26 CT ₁ The current interruption detection unit 25 for the secondary current is connected. Here, the overvoltage detector 21, when the lamp L ₁ is a high voltage is generated on the secondary side of the current transformer CT ₁ and Dancin, short circuit portion detects this
27, and has a high impedance so that no current flows. The short-circuit portion 27 is connected to the current transformer CT.
A thyristor unit 22 for short-circuiting _a secondary side, and the time setting unit 24 for setting a time-tau ₁ corresponding to the determination time until the start of release of the short circuit, after this time, a predetermined time T
And a short-circuit control unit 23 that controls the thyristor unit 22 to release the short circuit. The times set in the time setting unit 24 are the terminal units R ₁ , R ₂ ,.
_The length differs for each _n , such as τ ₁ <τ ₂ <... <τ _n .

The operation of the embodiment constructed as described above will be described below with reference to the time chart of FIG. First, it lights L ₁ is When the Dancing at time t ₁ in FIG. 3, the secondary side of the current transformer CT ₁ is an overvoltage occurs the state close to open. The overvoltage overvoltage detector 21 of the terminal portion R ₁ notifies the short circuit control unit 23 detects. Short-circuit control unit 23
When receives this notification, the cross-sectional core detector 6 the secondary side of the current transformer CT ₁ by driving the thyristor unit 22 at time t ₂ when the state holding time T _s has elapsed required to detect the cross-sectional core Short circuit.

On the other hand, lamp L ₁ is to change the constant current power supply unit 2 viewed from the load in Bee drawers when Dancing. Thereby, the waveforms of the output voltage and the output current of the constant current power supply device 2 change. The cross-sectional core detector 6 detects the sectional cores and the number of the cross-sectional center of the lamp on the basis of this change, and outputs the cross-sectional core signal from time t ₁ to time t _2. The principle of this detection is disclosed in, for example, Japanese Patent Publication No. 61-15556 and is well-known, so that the description thereof will be omitted. Thus, the cross-sectional the core detector 6 detects the cross-sectional core of lights, time not interfering with the lighting of the lamp power control unit 8 receives the signal, i.e., a constant current power supply unit from time t ₃ to t ₄ 2 is momentarily stopped (hereinafter, referred to as momentary stop).

During this momentary stop, the secondary current of the current transformer CT ₁ to which the lamp L ₁ is connected becomes zero. The current break detection unit 25 detects this and notifies the short circuit control unit 23. Therefore, after a short circuit control unit 23 determines the time tau ₁ is set in the time setting unit 24 from a stop moment, the secondary side of a predetermined time by driving the thyristor 22 T only current transformer CT ₁ in an open state I do.

As described above, when the secondary side of the current transformer CT ₁ is opened, the waveforms of the output voltage and the output current of the constant current power supply 2 change again, and the disconnection detecting unit 6 starts to operate from the time t _5. until time t ₆ for outputting a disconnection core signal. At this time, the decentering position determination unit 9 determines the time t ₄ at which the power control unit 8 makes an instantaneous stop.
Clocking operation has begun, the time t ₅ the time determination is time to receive the cross-sectional core signal stored therein in advance from τ
_1n , τ _2n ,..., Τ _nn (corresponding to the determination times τ ₁ , τ ₂ ,..., Τ _n stored in the time setting unit 24). Then, it is determined that the lamp L ₁ is Dancing if I match the determined time tau _1n.

In addition to the detection of the disconnection position, the disconnection position determination unit 9 determines the overlap and continuity of the disconnection of the lamp based on the output of the disconnection detection unit 6. And a function to restart the centering position detection processing. These functions will be described with reference to FIGS.

[0026] First, the other lamp is Dancing while lighting L ₁ is released only the secondary side of a short circuit of the transformer CT ₁ time T from the time t ₅ by the Dancing to t ₆ I do. At this time, the distortion of the output voltage waveform of the constant current power supply device 2 increases. The cross-sectional core detector 6 detects this, as shown in FIG. 4, lamplight sectional core number from time t ₅ to time t ₁₁ outputs a signal "1", from the time t ₁₁ to time t ₆ lamplight sectional cores number outputs a signal of "2", further, lights sectional core number from time t ₆ to time t ₁₂ outputs a signal "1". On the other hand, the decentering position determination unit 9 determines that the number of decentered is “2”.
And time T _A is, the sum of the time T _B which cross the core continues,
It is determined that it is equal to the sum of the signal generation time T and the state holding time T _s , that is, T _A + T _B = T + T _s , and the power supply control unit 8 repeats the instantaneous stop operation as duplication of the lamp disconnection. And the centering position detection process is executed again.

Next, lamp L ₁ is shorted other lamp immediately after the secondary side of only transformer CT ₁ time T from the time t ₅ by the Dancing until t ₆ it is assumed that the Dancing. At this time,
The output voltage waveform of the constant current power supply 2 is distorted for a long time. The cross-sectional core detector 6 detects this, as shown in FIG. 5, the time continuous combination of the time T _s of the time T from time t ₅ to time t _6, the time t ₆ to time t ₇ Then, a signal indicating that the number of broken lights is "1" is output. Therefore, the cross-sectional core position determination unit 9 is continuously output time of the cross-sectional core detection signal T + T _s
Is detected, it is determined that the lamp is disconnected, and the disconnection position detection process is executed again.

It should be noted, transformer CT ₁ by the cross-sectional center of lamp L ₁
Other lights just before short-circuited to the secondary side when the sectional core detector 6 and the cross-sectional core has output the sectional core signal over T + T _s time also, the cross-sectional core position determination section 9 of the lamp disconnection core It is determined that they are continuous, and the centering position detection processing is executed again.

In this case, the state holding time is T _s , the decentering position determination time is τ _n (n = 1, 2,..., N), and the signal generation time is T and T <T _s <τ _n and By providing the relationship of T + T _s <τ _n , it is possible to reliably determine the overlap and continuity of the lamp disconnection.

While the above description has been made on the case where one of the other lamps is disconnected during the determination of the disconnection position by the disconnection position detecting section 9, the same applies to the case where more lamps are disconnected. And continuation can be determined.

Thus, according to this embodiment, even if a new disconnection occurs during the process of detecting the disconnection position, the disconnection position can be accurately detected.

[0032]

As described above, according to the present invention, the disconnection position judging section detects the disconnection position of the lamp based on the time difference between the instantaneous stop of the AC power supply output and the detection point of the disconnection. The power control unit performs an instantaneous stop operation by judging the overlap and continuity of the disconnection, and performs the process of detecting the disconnection position of the light again. Even in the case where the centering occurs before and after, the centering position can be accurately detected without overlooking the centered lamp.

In this case, the state holding time T _s , the decentering position determination time τ _n (n = 1, 2,..., N), and the signal generation time T
By providing the relations of <T _s <τ _n and T + T _s <τ _n , it is possible to reliably determine the overlap and continuity of the lamp disconnection.

[Brief description of the drawings]

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

FIG. 2 is a block diagram showing a detailed configuration of main elements of one embodiment of the present invention.

FIG. 3 is a time chart for explaining the operation of one embodiment of the present invention.

FIG. 4 is a time chart for explaining the operation of one embodiment of the present invention.

FIG. 5 is a time chart for explaining the operation of one embodiment of the present invention.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 AC power supply 2 Constant current power supply device 5 Series lighting circuit 6 Disconnection detection unit 7 Master station 8 Power control unit 9 Disconnection position determination unit 21 Overvoltage detection unit 22 Thyristor unit 23 Short circuit control unit 24 Time setting unit 25 Current disconnection detection unit R _n terminal CT _n current transformer L _n lamp

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H05B 37/03 G01R 31/08

Claims (2)

(57) [Claims] 1. A lamp core position detecting device for detecting a core position of a lamp connected to a secondary side of a plurality of current transformers whose primary sides are connected in series to a constant current type AC power supply. Provided for each lamp, short-circuiting the secondary side of the current transformer after the elapse of a certain state holding time by detecting the disconnection of the corresponding lamp, and individually setting each lamp from the momentary stop of the AC power supply. A terminal unit that releases the short circuit until a certain signal generation time elapses from the time when the disconnection position determination time has elapsed, and an output voltage waveform of the AC power supply is monitored, and the disconnection of the lamp is determined based on the change in the output voltage waveform. And a power control for instantaneously stopping the output of the AC power supply on condition that the power detection unit detects the power failure, and generates a signal corresponding to the number of the power failure lights. Unit, every time the output of the AC power Detecting the position of the disconnection of the lamp by the time difference between the stop time and the disconnection detection time of the disconnection detection unit, and determining the overlap and continuity of the disconnection of the light based on the output signal of the disconnection detection unit. A light-off-center-position detecting device, comprising: a master station having a power-off position determining unit for causing the power supply control unit to perform an instantaneous stop operation and re-detecting the off-center position of the light. 2. Assuming that the state holding time is T _s , the decentering position determination time is τ _n (n = 1, 2,..., N), and the signal generation time is T, 2. The light-off-center-position detecting device according to claim 1, wherein a relationship of <T _s <τ _n and T + T _s <τ _n is satisfied.