JPH06265592A - Disconnection detector and disconnection monitor - Google Patents

Abstract

PURPOSE:To provide a disconnection detector in which S/N ratio can be enhanced by separating noise easily from a disconnection detection signal at the time of extinguishing or firing arc. CONSTITUTION:A feeder line 11 transmits power subjected to phase control. At a receiving section, a circuit 121 detects an unfired section in phase control and produces a mask signal S2. At a control section, a circuit 131 produces a disconnection detection signal S11 which is interrupted by a logic circuit 132 when a mask signal S2 is 'present' but outputted, as it is, when the mask signal S2 is 'absent'. A transmitting section 14 transmits the disconnection detection signal S11 on the feeder line 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disconnection detector and a disconnection monitor, and more particularly, to a phase-controlled power when the phase-controlled power and the disconnection detection signal are transmitted in the same load power line. Detecting the non-ignition section, transmitting or receiving the disconnection detection signal while avoiding the non-ignition section,
The present invention relates to a technique for discriminating noise and a transmission signal at the time of extinguishing and firing, and shortening the transmission interval of a disconnection detection signal to speed up disconnection detection.

[0002]

2. Description of the Related Art FIG. 11 is a circuit diagram showing a configuration of a conventional disconnection monitoring device. The figure shows the case applied to a runway light that indicates the position of the runway. In the figure, 31 to 3m are load power lines, 41 to 4m are constant current control circuits, 511 to
Reference numerals 51n and 5m1 to 5mn are disconnection detectors, and 6 is a monitoring circuit.

The load power lines 31 to 3m carry phase-controlled power and disconnection detection signals. The load power lines 31 to 3m are driven by a constant current to supply the same power to all the lamps 711 to 71n and 7m1 to 7mn. The constant current control circuits 41 to 4m are commercial power sources (50Hz, 60H
z) is phase-controlled to supply power based on a constant current to the load power lines 31 to 3m.

The disconnection detectors 511 to 51n and 5m1 to 5mn are inserted and connected to the load power lines 31 to 3m through the transformers 811 to 81n and 8m1 to 8mn, and the load power lines 31 to 3m.
Receive power transmission from Transformer 811 ~ 81n, 8m1 ~ 8
For mn, a so-called rubber transformer that converts a constant current into a constant voltage is used. Disconnection detector 511-51n, 5m1-5mn
The constant voltage obtained by the transformers 811 to 81n and 8m1 to 8mn is supplied to the lamps 711 to 71n and 7m1 to 7mn through the power supply line.
To turn on the lamps 711 to 71n and 7m1 to 7mn.
Further, the disconnection detectors 511 to 51n and 5m1 to 5mn are connected to the disconnection detection signals S11 to S1 at the transmission timings assigned thereto.
n, Sm1 to Smn are transmitted to the power supply line for about 200 msec. For example, the disconnection detector 51n has {(n-1) * since the disconnection detector 511 starts transmitting the disconnection detection signal S11.
After the time of 200 msec} has elapsed, the disconnection detection signal S1n is transmitted for 200 msec. After the disconnection detector 511 starts transmitting the disconnection detection signal S11, the disconnection detector 5mn receives {(m *
(n-1) * 200 msec}, the disconnection detection signal Smn is transmitted for 200 msec. Disconnection detection signal S11
~ S1n, Sm1 ~ Smn are transformers 811 ~ 81n, 8m1 ~ 8
It is transmitted to the load power lines 31 to 3m via mn.

The monitoring circuit 6 includes load power lines 31 to 3 m.
Disconnection detection signals S11 to S1n, Sm1 sequentially transmitted via
˜Smn presence / absence of the lamps 711 to 71n and 7m1 to 7mn are determined.

[0006]

However, the conventional disconnection detector and disconnection monitoring device have the following problems. (A) Since the disconnection detector transmits the disconnection detection signal even during extinguishing or firing in phase control, it becomes difficult for the monitoring circuit to distinguish noise during extinguishing or firing from the disconnection detection signal. (B) The disconnection detector must transmit the disconnection detection signal for a long time in order for the monitoring circuit to separate the disconnection detection signal from noise and reliably determine the presence or absence of disconnection. Therefore, there is a problem that it takes a long time to detect disconnection of all the lamps. (C) When a very large number of lighting devices are connected, such as a runway light, and the wiring distance of the load power line is long, the disconnection detection signal is greatly attenuated and a predetermined S / N ratio cannot be secured. . Further, it is not possible to detect the disconnection of all the lamps within an interval when the aircraft departs and arrives, for example, within 2 minutes.

A first object of the present invention is to provide a disconnection detector and a disconnection monitoring device which can easily separate noise and a disconnection detection signal at the time of extinguishing or firing and improve the S / N ratio. That is.

A second object of the present invention is to provide a disconnection detector and a disconnection monitoring device which can shorten the processing time for disconnection detection.

[0009]

In order to solve the above-mentioned problems, the present invention includes a power supply line, a receiving unit, a control unit, and a transmitting unit, and disconnects a load connected to the power supply line. A disconnection detector that outputs the presence or absence of a disconnection detection signal as a disconnection detection signal, wherein the power supply line transmits phase-controlled power, and the receiving unit is connected to the power supply line and is non-ignited. A non-firing interval detection circuit including a section detection circuit detects a non-firing interval in phase control to generate a mask signal, and the control unit includes a disconnection detection signal generation circuit and a logic circuit. The mask signal is input, the disconnection detection signal generation circuit generates the disconnection detection signal, the logic circuit cuts off the disconnection detection signal when the mask signal is “present”, and the mask signal “no Before And it outputs a disconnection detection signal, the transmission unit is connected to the power supply line, and transmits the disconnection detection signal to the power supply line.

Further, a load power line, a disconnection detector,
A load disconnection monitoring device including a monitoring circuit, wherein the load power line performs power transfer by phase control, the disconnection detector is as described above, and the power supply line is the load. Connected to the power line,
The monitoring circuit includes a signal transmission line, a reception unit, and a determination unit, the signal transmission line is connected to the load power line, the reception unit is connected to the signal transmission line, Including a firing interval detection circuit and a receiving circuit,
The non-firing section detection circuit detects a non-firing section in phase control and generates a mask signal, and the receiving circuit receives the disconnection detection signal when the mask signal changes from "present" to "absent". , A reception signal is output, and the determination unit determines whether or not the load is disconnected based on the reception signal.

[0011]

The power supply line transmits the phase-controlled power, the receiver is connected to the power supply line, and the non-ignition section detection circuit detects the non-firing section in the phase control and masks it. The control unit generates a signal and the disconnection detection signal generation circuit generates a disconnection detection signal. When the logic circuit has the mask signal "present", the disconnection detection signal is cut off, and when the mask signal is "absent", the disconnection detection signal is detected. The signal is output, the transmission unit is connected to the power supply line, and transmits the disconnection detection signal to the power supply line. The transmission is cut off, noise at the time of extinguishing or firing and the disconnection detection signal are not simultaneously transmitted to the power supply line, and noise at the time of extinguishing or firing and the disconnection detection signal are separated and S Aiming to / N ratio Disconnection detector is obtained which can be.

[0012] Further, noise at the time of extinguishing or firing and the disconnection detection signal are not simultaneously transmitted to the power supply line. Therefore, from the viewpoint of the monitoring circuit receiving the disconnection detection signal, the received disconnection detection signal is received. That is, all the wire breakage detection signals transmitted during the ignition period can be processed as genuine signals. For this reason, the disconnection detector can shorten the transmission time of the disconnection detection signal, and can shorten the processing time of the disconnection detection.

Further, the disconnection detector has a power supply line connected to a load power line for carrying phase-controlled power, and the monitoring circuit has a signal transmission line connected to the load power line and a receiving unit having a signal transmission line. Connected to the non-firing section detection circuit and the receiving circuit, the non-firing section detection circuit detects the non-firing section in the phase control, generates a mask signal, the receiving circuit from the "presence" Since the disconnection detection signal is received and the received signal is output when the signal changes to "None", the disconnection detection signal is separately received from the noise at the time of arc extinction or ignition, and the S / N ratio is improved. . As a result, the wiring distance of the load power line can be increased. Since the determination unit determines the presence / absence of disconnection of the load based on the disconnection detection signal that is separately received, it is possible to reduce the determination time for the presence / absence of disconnection. Moreover, since the determination can be made by the disconnection detection signal transmitted during the ignition section, the processing time for the disconnection detection can be shortened.

[0014]

1 is a block diagram showing the construction of a disconnection monitoring apparatus according to the present invention. In the figure, the same reference numerals as those in FIG. 11 denote the same components. 111 to 11n, 1
m1 to 1mn are disconnection detectors, and 2 is a monitoring circuit. Load 711
.About.71n and 7m1 to 7mn will be described by limiting to a lamp.

FIG. 2 is a block diagram showing the configuration of the first embodiment of the disconnection detector according to the present invention. The figure shows disconnection detector 1
11 is shown as a representative, 11 is a power supply line, 12
Is a receiver, 13 is a controller, and 14 is a transmitter. The disconnection detector is composed of a microcomputer, and each component is conceptually expressed.

The power supply line 11 transmits electric power based on the phase-controlled current. The lamp 711 is connected to the power supply line 11 in series.

The receiver 12 is connected to the power supply line 11 and includes a non-ignition section detection circuit 121. The non-ignition section detection circuit 121 detects a non-ignition section in phase control and generates a mask signal S2. Specifically, it is composed of a comparator circuit or a differentiating circuit, and detects the start point and the end point of the non-ignition section based on the voltage level or the differential value of noise generated at the time of extinguishing and firing, and the mask signal S2 between them. And The power supply circuit 124 is a constant voltage power supply that operates the disconnection detector. The transformer 125 transmits electric power and signals required for the disconnection detector, and also isolates the internal circuit from the load electric power line.

The control unit 13 includes a disconnection detection signal generation circuit 13
1 and the logic circuit 132, and the mask signal S2 is input. The disconnection detection signal generation circuit 131 generates a disconnection detection signal S11. The disconnection detection signal S11 is 40 to 80 kHz
The frequency is set to one of the frequencies z, and the frequency is different when the disconnection is not detected and when the disconnection is detected. The logic circuit 132 cuts off the disconnection detection signal S11 when the mask signal S2 is “present”, and the mask signal S2
The disconnection detection signal S11 is output when it is "none". The logic circuit 132 enables the mask signal S2 “absent” A
It can be composed of an ND circuit.

The transmitter 14 is connected to the power supply line 11, the amplifier circuit 141 amplifies the disconnection detection signal S11, and the transformer 142 transmits the amplified disconnection detection signal S11 to the power supply line 11.

FIG. 3 is a timing chart for explaining the operation of the disconnection detector according to the first embodiment. In the figure,
IW1 is a phase-controlled current waveform, S1 is a non-ignition section detection signal, S2 is a mask signal, and S11 is a disconnection detection signal transmitted from the transmitter 14 to the power supply line 11. The non-ignition section detection signal S1 is a comparator output for positive and negative reference levels, and the mask signal S2 is the negative section of the non-firing section detection signal S1. FIG. 3 will be described together with operation with reference to FIGS. 1 and 2.

As described above, the power supply line 11 is
The phase-controlled power is transmitted, and the receiving unit 12
Is connected to the power supply line 11, the non-ignition section detection circuit 121 detects the non-ignition section Toff in the phase control, generates the mask signal S2, and the control unit 13 causes the disconnection detection signal generation circuit 131 to disconnect. The detection signal S11 is generated, the logic circuit 132 cuts off the disconnection detection signal S11 when the mask signal S2 is "present", and outputs the disconnection detection signal S11 when the mask signal S2 is "absent". Is connected to the power supply line 11 and transmits the disconnection detection signal S11 to the power supply line 11, and when noises N1 to N4 are generated (t1 to t4) during arc extinction and ignition in phase control. Transmission of disconnection detection signal S11 is cut off, and power supply line 1
The noises N1 to N4 at the time of extinguishing or firing and the disconnection detection signal S11 are not transmitted at the same time, and the noises N1 to N4 at the time of extinguishing or firing and the disconnection detection signal S11 are separated. A disconnection detector that can improve the S / N ratio is obtained.

Further, since the noises N1 to N4 at the time of extinguishing or firing and the disconnection detection signal S11 are not transmitted to the power supply line 11 at the same time, the monitoring circuit 2 receiving the disconnection detection signal S11 looks at them. And the received disconnection detection signal S1
1, that is, the disconnection detection signal S11 transmitted during the ignition section Ton
Can be treated as true signals. Therefore, the disconnection detector 111 can shorten the transmission time of the disconnection detection signal S11, and can shorten the processing time of the disconnection detection. In the embodiment, within one cycle of the frequency of the commercial power source (50H
If z, within 20 msec), disconnection can be detected.

In the first embodiment, the receiver 11 and the transmitter 14 are inserted and connected to the power supply line 11. Since the power supply line 11 is connected in series to the lamp 711, when the lamp 711 is disconnected, the disconnection detection signal S11 is not transmitted from the power supply line 11 to the load power line 31. For this reason, the disconnection detection signal S11 is “absent” or “present”.
Are associated with disconnection “present” and “absent”, and the disconnection signal generation circuit 131 may transmit one type of frequency signal as the disconnection detection signal S11 without determining whether or not disconnection is detected.

FIG. 4 is a timing chart for explaining the operation of the disconnection detector according to the second embodiment. In the figure,
The same reference numerals as those in FIGS. 2 and 3 denote the same components. The non-firing section detection circuit 121 generates the mask signal S2 at the extinguishing times t1 and t3 and the firing times t2 and t4 in the phase control. The mask signal S2 is obtained as one shot when the non-ignition section detection signal S1 rises and falls. The interruption time T1 of the mask signal S2 is set to be longer than the times of the noises N1 to N4 during extinguishing and firing. Therefore, the noises N1 to N are generated even during the non-ignition section Ton.
4, the disconnection detection signal S11 can be transmitted, and the non-ignition section T
Even when on becomes long, the disconnection can be detected within one cycle of the frequency of the commercial power source.

Further, in the disconnection detectors according to the first and second embodiments, the power supply line 11 has the load power lines 31 to 3.
The reset signal RS1 transmitted via m is transmitted.
The receiver 12 includes a reset signal detection circuit 122 and a timing circuit 123. The reset signal detection circuit 122 detects the reset signal RS1 and outputs an internal reset signal RS2. The timing circuit 123 outputs a command signal S3 that commands the timing of transmitting the disconnection detection signal S11 after receiving the internal reset signal RS2. For example, the timing circuit 123 of the disconnection detector 111.
20 immediately after the internal reset signal RS2 disappears.
The command signal S3 of msec is output. Similarly, disconnection detector 1
The timing circuit 123 of 1n outputs the command signal S3 of 20 msec after the time of (n-1) * 20 msec has passed since the internal reset signal RS2 disappeared, and the disconnection detector 1mn
The timing circuit 123 outputs the command signal S3 of 20 msec after (m * n-1) * 20 msec has elapsed since the internal reset signal RS2 disappeared. Control unit 13
Outputs the disconnection detection signal S11 when the logic circuit 132 has the mask signal S2 "absent" and the command signal S3 "present". Therefore, the disconnection detection signals S11 to S1n and Sm1 to Smn transmitted from the disconnection detectors 111 to 11n and 1m1 to 1mn are independent, and the monitoring circuit 2 has the disconnection detection signals S11 to S1.
Disconnection can be detected by determining whether or not n and Sm1 to Smn are sequentially transmitted.

The non-ignition section detection circuit 121 generates a clock signal S4 according to the frequency of the phase-controlled power. The clock signal S4 is obtained from the non-ignition section detection signal S1. The timing circuit 123 has a counter CT1.
And a setter ES1 and a comparator CP1. The counter CT1 resets the contents by the internal reset signal RS2, counts by the clock signal S4, and counts the count data.
Data S41 is output. The setter ES1 outputs address data S42 indicating its own address. Comparator CP1
Compares the count data S41 with the address data S42, and outputs a command signal S3 when they match. Therefore, the disconnection detectors 111 to 11n and 1m1 to 1mn can transmit the disconnection detection signals S11 to S1n and Sm1 to Smn in synchronization with the phase-controlled power.

The control unit 13 includes a reset signal generation circuit 13
Includes 3. The reset signal generation circuit 133 uses the internal reset signal RS2 to reset the relay reset signal RS3.
To occur. The logic circuit 132 uses the relay reset signal R
S3 is output in priority to the disconnection detection signal S11. For this reason, even if the reset signal RS1 transmitted through the load power lines 31 to 3m is attenuated, the relay reset signal RS3 of the disconnection detector reliably resets the disconnection detector ahead of the reset signal RS1 and the transmission timing is shifted. Disconnection detection signal S11
Interference between ~ S1n and Sm1 ~ Smn can be prevented.

FIG. 5 is a block diagram showing the configuration of the third embodiment of the disconnection detector. In the figure, the same reference numerals as those in FIG. 2 indicate the same components. Reference numeral 15 is a current detection circuit.

The receiver 12 and the transmitter 14 are connected in parallel to the power supply line 11. The current detection circuit 15 is
It is inserted and connected to the power supply line 11, detects the current supplied to the lamp 711, and outputs the current detection signal S5. The disconnection detection signal generation circuit 131 determines whether or not the lamp 711 is disconnected based on the current detection signal S5, and outputs a disconnection detection signal S11 when the disconnection is determined. As a result, the same effects as those of the first and second embodiments can be obtained.

FIG. 6 is a block diagram showing the structure of the monitoring circuit. In the figure, 21 is a signal transmission line, 22 is a receiving unit, and 23 is a determining unit. The monitoring circuit is composed of a microcomputer, and each component is conceptually expressed. A disconnection monitoring apparatus according to the present invention will be described with reference to FIGS. 1 and 6.

The load power lines 31 to 3m carry power by phase control. Disconnection detectors 111 to 11n, 1m1 to
1 mn is as described above, and the power supply line 11 is connected to the load power lines 31 to 3 m.

The monitoring circuit 2 includes a signal transmission line 21, a receiving section 22, and a judging section 23. The signal transmission line 21 is connected to the load power lines 31 to 3m via the transformer 20.

The receiver 22 is connected to the signal transmission line 21 and includes a non-ignition section detection circuit 221 and a reception circuit 222. The non-firing section detection circuit 221 detects the non-firing section in the phase control and generates the mask signal S6.
The non-ignition section detection circuit 221 is configured similarly to the non-ignition section detection circuit 121 of the disconnection detector, and the mask signal S6 also plays the same role as the mask signal S2. The reception circuit 222 sequentially receives the disconnection detection signals S11 to S1n and Sm1 to Smn when the mask signal S6 changes from "present" to "absent", and the reception signal S7 is received.
Is output. Actually, the trigger signal TRG is generated when the mask signal S6 changes from "present" to "absent", and determines the reception timing of the disconnection detection signals S11 to S1n and Sm1 to Smn.

The judging section 23 judges whether or not the lamps 711 to 71n and 7m1 to 7mn are disconnected based on the received signal S7.

Further, the monitor circuit 2 includes a display section 25 and a power supply section 26. The display unit 25 is normal or abnormal,
Displays the judgment result such as the number of the lamp that has an abnormality. The power supply unit 26 is a constant voltage power supply for operating the monitoring circuit.

FIG. 7 is a timing chart for explaining the operation of the monitoring circuit. In the figure, IW1 is a phase-controlled current waveform, S6 is a mask signal, S7 is a received signal, TR
G is a trigger signal. FIG. 7 will be described together with operation with reference to FIGS. 1 and 6.

As described above, the disconnection detectors 111 to 11n,
1 m1 to 1 mn are connected to the load power lines 31 to 3 m that carry the power whose phase is controlled by the power supply line 11, and in the monitoring circuit 2, the signal transmission line 21 is connected to the load power line 31.
Is connected to the signal transmission line 21, and the non-ignition section detection circuit 221 and the reception circuit 22 are connected.
2, the non-firing section detection circuit 221 detects the non-firing section in the phase control, generates the mask signal S6, and the receiving circuit 222 detects the disconnection when the mask signal S6 changes from "present" to "absent". Since the signals S11 to S1n and Sm1 to Smn are sequentially received and the reception signal S7 is output, the disconnection detection signals S11 to S1n and Sm1 to Smn are separated from the noise N1 to N4 during extinguishing or firing. Upon reception, the S / N ratio is improved. As a result, the wiring distance of the load power lines 31 to 3 m can be increased, and a large number of lamps can be connected. The determination unit 23 separates and receives the disconnection detection signals S11 to S1n,
Since it is determined whether or not the lamps 711 to 71n and 7m1 to 7mn are disconnected based on Sm1 to Smn, it is possible to shorten the determination time for the presence or absence of disconnection. Moreover, since the determination can be made by the disconnection detection signals S11 to S1n and Sm1 to Smn transmitted during the ignition section Ton, the processing time for the disconnection detection can be shortened.

Further, the receiving section 22 has a counter section CT2. The non-ignition section detection circuit 221 generates a clock signal S8 according to the frequency of the phase-controlled power.
The counter CT2 counts the clock signal S8, and the count data S81 causes the disconnection detection signals S11 to S1n and Sm1 to Smn.
Correspond to the disconnection detectors 111 to 11n, 1m1 to 1mn. Therefore, the determination unit 23 determines that the disconnection detection signals S11 to S1n and Sm1.
According to the counting data S81 when ~ Smn cannot be received,
It is possible to identify the lamp that has a disconnection.

Further, the judging section 23 is an A / D converting section 231.
And a Fourier analysis unit 232. The A / D conversion unit 231 starts A / D conversion when the mask signal S6 changes from “present” to “absent”, and outputs an A / D converted signal S9. The Fourier analysis unit 232 has a window function, and A
The disconnection detection signals S11 to S1n and Sm1 are obtained by multiplying the / D conversion signal S9 and the window function and performing DFT or FFT calculation.
~ Obtain the frequency spectrum of Smn, and determine from the frequency spectrum whether or not there is a break in the lamps 711-71n, 7m1-7mn,
The determination signal S10 is output. So-called DFT or FF
Perform T detection. The address signal generating circuit 223 generates an address signal S82 corresponding to the disconnection detection signals S11 to S1n and Sm1 to Smn for receiving the counting data S81 based on the counting data S81. The logic circuit 224 outputs the A / D command signal S83 when the mask signal S6 and the address signal S82 are input and the mask signal S6 is “absent” and the address signal S82 is “present”. A / D conversion is
It is performed 1024 times per 1 msec.

FIG. 8 is a time chart for explaining the operation of the judging section. In the figure, the same reference numerals as those in FIG. 7 indicate the same components. In the figure, T is the data length, N is the sampling number, fd (i) is the sampling value of the A / D converted signal, W is the window function, and W (i) is the window function value. Data length T is 1 msec, sampling number N is 10
It is set at 24 points. The window function W is a rectangular window,
A triangular window, a Hamming window, a Gaussian window, etc. are used, and the embodiment is a Hamming window having a large damping action.

FIG. 9 is a power spectrum showing the result of FFT detection. The horizontal axis represents frequency and the vertical axis represents level. If the level of the frequency f1 is equal to or higher than the detection level TS, the Fourier analysis unit 232 determines that there is no disconnection of the lamp and the lamp is normal.

FIG. 10 is a flow chart for explaining the concept of FFT detection. 10 with reference to FIG. 8 and FIG.
Will be explained. When there is an A / D command signal, the A / D converted signal is taken in, the A / D converted signal is multiplied by the window function, and the FFT operation is performed. Specifically, the disconnection detection signal S
The level Ld (f1) of the frequency spectrum f1 of 11 to S1n and Sm1 to Smn is Ask as. Here, N is 1024.

Since the disconnection detection signals S11 to S1n and Sm1 to Smn have only one frequency, if the value of the level Ld (f1) is equal to or higher than the detection level, it can be processed that the corresponding lamp is normal. Since the product-sum calculation per time can be executed in 0.5 μsec by using the digital signal processor (DSP), the calculation of the equation (1) is completed in 0.5 msec. Further, since the non-ignition section does not become 10 msec at maximum in one cycle (20 msec), the calculation of the equation (1) can be executed 20 times or more. Therefore, in order to improve the detection accuracy of the disconnection detection signal, the vicinity of the frequency f1 is set to 1 kHz.
When several points are calculated at intervals, it is confirmed that there is no frequency other than frequency f1, the level counter is added, and when the value of the level counter is L times or more, the judgment signal S10 that the lamp is normal is output. It is supposed to do.

In this way, the disconnection detection signals S11 to S1n, while avoiding the noises N1 to N4 when the phase control is extinguished and fired,
Sending and receiving Sm1 to Smn, DFT detection or FF
By performing the T detection, it becomes possible to detect a signal lowered to −80 dB. Therefore, even when the load power lines 31 to 3 m with the attenuation characteristic of 18 dB / 2 km are used, the extension can be extended to 10 km.

The monitoring circuit 2 shown in FIG. 6 is a reset circuit 2
Have four. The reset circuit 24 uses the setting device ES2.
And a comparator CP2 and a reset signal generating circuit 241. The setting device ES2 includes disconnection detectors 111 to 11n,
The number data S85 corresponding to the installed number of 1 m1 to 1 mn is output. The counting data S81 is input to the comparator CP2,
The count data S81 and the number data S85 are compared, and when they match each other, the reset command signal RS4 is output to the reset signal generation circuit 241. Reset signal generation circuit 241
Supplies the reset signal RS1 to the signal transmission line 21. Therefore, it is possible to sequentially monitor the presence or absence of the disconnection of the lamp, and constantly monitor the lamp at a constant cycle.

As described above, the noises N1 to synchronism with the phase-controlled power and at the time of extinguishing and firing the phase control are provided.
10 msec to 20 msec per lamp by sending and receiving disconnection detection signals S11 to S1n and Sm1 to Smn while avoiding N4
With this, it becomes possible to detect the disconnection, and it becomes possible to monitor the disconnection of 6000 to 12000 lamps in the interval when the aircraft takes off and landing, for example, in 2 minutes.

Moreover, since the disconnection detection signal of each lamp is transmitted and received independently in synchronization with the phase-controlled power, the disconnection detection signal of the same frequency is used even when the load power lines are multi-lined. So, 6000 to 12000
Individual lamps can be distributed over multiple lines.

[0048]

As described above, according to the present invention, the following effects can be obtained. (A) The transmission of the disconnection detection signal is interrupted when noise is generated during arc extinction and ignition during phase control, and noise during extinction or ignition and the disconnection detection signal are separated to improve the S / N ratio. A disconnection detector can be provided. (B) As a result of improving the S / N ratio, it is possible to provide a disconnection detector capable of lengthening the wiring distance of the load power line. (C) Since noise at the time of extinguishing or ignition and the disconnection detection signal are not simultaneously transmitted to the power supply line, all disconnection detection signals transmitted during the ignition section can be processed as genuine signals. It is possible to provide a disconnection detector that can shorten the processing time for disconnection detection. (D) It is possible to provide a disconnection monitoring device capable of improving the S / N ratio by separately receiving the disconnection detection signal from noise during extinguishing or firing. (E) A disconnection monitoring device capable of shortening the processing time of the disconnection detection because the presence or absence of the disconnection of the load can be determined based on the disconnection detection signal that is separately received and can be determined by the disconnection detection signal transmitted during the ignition section. Can be provided.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a disconnection monitoring device according to the present invention.

FIG. 2 is a block diagram showing a configuration of a first embodiment of a disconnection detector according to the present invention.

FIG. 3 is a timing chart for explaining the operation of the disconnection detector according to the first embodiment.

FIG. 4 is a timing chart for explaining the operation of the disconnection detector according to the second embodiment.

FIG. 5 is a block diagram showing the configuration of a third embodiment of the disconnection detector according to the present invention.

FIG. 6 is a block diagram showing a configuration of a monitoring circuit.

FIG. 7 is a timing chart illustrating the operation of the monitoring circuit.

FIG. 8 is a time chart illustrating the operation of the determination unit.

FIG. 9 is a power spectrum showing a result of FFT detection.

FIG. 10 is a flowchart illustrating the concept of FFT detection.

FIG. 11 is a circuit diagram showing a configuration of a conventional disconnection monitoring device.

[Explanation of Codes] 11-1 1n disconnection detector 1m1-1mn disconnection detector 11 power supply line 12 receiver 121 non-ignition section detection circuit 13 controller 131 disconnection detection signal generation circuit 132 logic circuit 14 transmitter 2 monitoring circuit 21 Signal transmission line 22 Reception unit 221 Non-ignited section detection circuit 222 Reception circuit 23 Judgment unit 31-3m Load power line 41-4m Constant current control circuit 711-71n Load (lamp) 7m1-7mn Load (lamp) S1 mask Signal S11 to S1n Disconnection detection signal Sm1 to Smn Disconnection detection signal N1, N3 Noise during extinguishing N2, N4 Noise during ignition S6 Mask signal S7 Received signal

Claims (12)

[Claims] 1. A disconnection detector including a power supply line, a reception unit, a control unit, and a transmission unit, which outputs the presence or absence of a disconnection of a load connected to the power supply line as a disconnection detection signal. The power supply line is for transmitting phase-controlled power, the receiving unit is connected to the power supply line, includes a non-ignition section detection circuit, the non-firing section detection circuit is a phase A non-ignition section in control is detected, and a mask signal is generated, the control unit includes a disconnection detection signal generation circuit and a logic circuit, the mask signal is input, and the disconnection detection signal generation circuit. Generates the disconnection detection signal, the logic circuit cuts off the disconnection detection signal when the mask signal "present", and outputs the disconnection detection signal when the mask signal "absent", The transmitter , Is connected to the power supply line, the disconnection detector is to transmit the disconnection detection signal to the power supply line. 2. The disconnection detector according to claim 1, wherein the reception unit and the transmission unit are inserted and connected to the power supply line. 3. A current detection circuit is inserted and connected to the power supply line, the current detection circuit detects a current supplied to the load and outputs a current detection signal, and the reception unit and the transmission unit are , Connected in parallel to the power supply line, the disconnection detection signal generating circuit determines the presence or absence of disconnection of the load based on the current detection signal, and outputs the disconnection detection signal when the disconnection is determined. The disconnection detector according to claim 1. 4. The disconnection detector according to claim 1, wherein the non-ignition section detection circuit generates the mask signal during extinguishment and ignition during the phase control. 5. The power supply line transmits a reset signal, the receiver includes a reset signal detection circuit and a timing circuit, and the reset signal detection circuit detects the reset signal, The timing circuit is to output a command signal that commands the timing of transmitting the disconnection detection signal after receiving the reset signal, the control unit, the control circuit, the logic circuit the mask signal "absent",
The disconnection detector according to claim 1, 2, 3 or 4, which outputs the disconnection detection signal when the command signal is “present”. 6. The non-ignition section detection circuit is for generating a clock signal according to the frequency of the power whose phase is controlled, and the timing circuit includes a counter, a setter, and a comparator. The counter resets the content by the reset signal, counts by the clock signal and outputs count data, the setter outputs address data indicating its own address, and the comparator is 6. The disconnection detector according to claim 5, wherein the count data and the address data are compared with each other and the command signal is output when they coincide with each other. 7. The control unit includes a reset signal generation circuit, the reset signal generation circuit generates a relay reset signal based on the reset signal, and the logic circuit converts the relay reset signal to the disconnection detection signal. The disconnection detector according to claim 1, 2, 3, 4, 5, or 6, which outputs with priority. 8. The load according to claim 1, wherein the load is a lamp.
The disconnection detector according to 3, 4, 5, 6 or 7. 9. A load disconnection monitoring device including a load power line, a disconnection detector, and a monitoring circuit, wherein the load power line performs power transfer by phase control, and the disconnection detector. Is in any one of Claim 1 thru | or 8, Comprising: The said electric power supply line is connected to the said load electric power line, The said monitoring circuit is a signal transmission line, a receiving part, and a determination part. Including, the signal transmission line is connected to the load power line, the receiver is connected to the signal transmission line, includes a non-ignition section detection circuit and a receiving circuit, the non-ignition section detection circuit Detects a non-ignition section in phase control, generates a mask signal, receives the disconnection detection signal when the receiving circuit changes from the mask signal “present” to “absent”, and outputs the received signal And The disconnection monitoring device is configured to determine whether or not a load has a disconnection based on the received signal. 10. A plurality of disconnection detectors are included,
Each of the disconnection detectors has a different timing for transmitting a disconnection detection signal, the receiving unit has a counter unit, and the non-ignition section detection circuit is phase-controlled according to the frequency of the power. 10. The disconnection monitoring apparatus according to claim 9, wherein a clock signal is generated, the counter counts the clock signal, and the disconnection detection signal is associated with the disconnection detector by counting data. 11. The determination section includes an A / D conversion section and a Fourier analysis section, and the A / D conversion section sets A when the mask signal changes from “present” to “absent”. A / D conversion is started, an A / D converted signal is output, the Fourier analysis section has a window function, and the A / D converted signal and the window function are multiplied to perform a DFT operation or an FFT operation. 10. The frequency spectrum of the disconnection detection signal is obtained, and the presence or absence of disconnection of the load is determined from the frequency spectrum.
Alternatively, the disconnection monitoring device according to item 10. 12. The monitoring circuit has a reset circuit, and the reset circuit includes a setter, a comparator, and a reset signal generation circuit, the setter depending on the number of the disconnection detectors installed. The count data is input to the comparator, the count data is compared with the count data, and when they match, a reset command signal is sent to the reset signal generating circuit. 12. The disconnection monitoring apparatus according to claim 9, 10 or 11, wherein the reset signal generating circuit supplies the reset signal to the signal transmission line.