JP2000150174A - Airport light control device - Google Patents

Abstract

(57) Abstract: An object of the present invention is to provide an airport light control device capable of improving the reliability of lights and reducing operation and maintenance costs by predicting the remaining life of the lights. The present invention measures a current flowing through a lamp and a voltage generated in the lamp, calculates a resistance value of the lamp from the current and the voltage, and predicts a remaining life of the lamp from a change over time in the resistance value. It was made.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light control system for guiding an aircraft, and more particularly to an airport light control device for controlling a light using a power line communication system (power line transfer system).

[0002]

2. Description of the Related Art A communication system using a power supply line is shown on page 175 of "Time Domain Measurement Technology of Electromagnetic Noise" (edited by the Technical Committee on Time Domain Measurement Technology of Electromagnetic Noise of the Institute of Electrical Engineers of Japan, Corona). I have. This technology is a lamp control system that supplies a current to a lamp connected to a power supply line via a power receiving transformer, wherein a master station and a slave station superimpose a high frequency (6) superimposed on a supply current of a commercial frequency flowing through the power supply line.
2 kHz) to detect the disconnection of the lamp.

Further, Japanese Patent Application Laid-Open Nos. 10-92588, 4-501035, and 5-505055
Discloses a light control system.

[0004]

In the prior art, the deterioration of the brightness of the lamp and the timing of the disconnection cannot be predicted. Therefore, the disconnection occurs suddenly, so that the reliability of the lamp is low. It is troublesome, the number of replacement storage lamps becomes large, and the operation and maintenance cost becomes large.

In the prior art, the phase at which a signal is superimposed on a power current is fixed. The brightness of the lamp needs to be adjusted according to the cloud height, and the control of the thyristor firing angle of the power supply device that supplies power to the lamp causes the waveform of the lamp supply current to change due to the brightness of the lamp. There is a drawback that transmission and reception between stations becomes impossible.

Further, in the prior art, the frequency of the signal for detecting the disconnection of the lamp is fixed at a constant value. But,
In the case of signal transmission / reception using a power supply line, since the distance of the power supply line is long and the number of lights connected to one power supply loop is large, the resistance, inductance, stray capacitance,
Signal transmission characteristics fluctuate due to changes in circuit constants such as the leakage inductance of the rubber transformer connected to the lamp, and in particular, changes in the capacitance to ground caused by the weather change (changes in the moisture ratio in the ground) of the feeder line placed underground. There is a drawback that transmission and reception between the master station and the slave stations become impossible, and that the disconnection cannot be detected. A method of allocating a signal frequency according to a position of a slave station is disclosed in Japanese Patent Application Laid-Open No. Hei 10-92588. However, the complexity of managing and selectively using a plurality of frequencies arises.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an airport light control device capable of improving the reliability of lights and reducing operation and maintenance costs by predicting the remaining life of the lights.

It is another object of the present invention to provide an airport light control device capable of setting the signal frequency to a value at which all the slave stations and the master station can transmit and receive, and ensuring the reliability of transmission and reception independent of the installation environment and weather. .

[0009]

SUMMARY OF THE INVENTION The present invention measures a current flowing through a lamp and a voltage generated in the lamp, calculates a resistance value of the lamp from the current and the voltage, and calculates a remaining time of the lamp based on a temporal change in the resistance value. The service life is predicted.

[0010]

Embodiments of the present invention will be described below.

A plurality (10 to 20) arranged in the passage of the aircraft
0), a rubber transformer 3, a slave station 2, a power supply device 6 for supplying electric power of a commercial frequency (50/60 Hz) to the plurality of lights 1, and a power supply line in which a master station 4 is arranged underground. 5
(Fig. 1), superimposes a signal of a frequency higher than the commercial frequency (in the order of kilohertz) on the power supply line 5, transmits and receives signals between the slave station 2 and the master station 4, and detects the disconnection of the lamp. And a lamp control device that performs ON / OFF control. Lights are placed on the runway / guideway in the airport and its surrounding area (roadside belt) to guide aircraft entering the airport, and aircraft traveling on the runway / taxiway. It is also used as a stop bar corresponding to. The power supply device 6 supplies a predetermined five-stage current, that is, a current of 2.8 to 6.6 amps. Note that the output voltage of the power supply device 6 depends on the number of lamps 1 and the current since the lamps 1 are connected in series.

The slave station 2 and the master station 4 have electronic circuits for transmitting and receiving signals. This electronic circuit includes a microprocessor, and has a transmitting / receiving function, that is, a function of measuring a power current waveform and setting a transmitting / receiving phase, a function of measuring a frequency of a received signal, decoding a meaning, storing the function, and transmitting a signal. . In addition to the transmission / reception function, the slave station has a function of measuring the current and voltage applied to the lamp, a function of calculating the resistance value of the lamp to estimate the life expectancy, and a function of turning on and off the lamp.
The master station 4 has a function of communicating with the central control device in addition to a transmission / reception function.

A system using the light control device includes a central control device 8 for centrally processing control information of a plurality of master stations 4, and a console 9 for an operator to monitor the light and issue an instruction to the light. have. The console 9 includes display input means such as a keyboard and a touch panel.
The centralized control device 8 and the master station 4, and the centralized processing device 8 and the console 9 are connected and communicated by, for example, a signal cable using an optical fiber.

Hereinafter, an embodiment of the light control device of FIG. 1 will be described more specifically.

This apparatus comprises a plurality of lamps 1, a slave station 2, a rubber transformer 3, a master station 4, a power supply line 5 buried underground, and a lamp 2.
A power supply device 6 for supplying a constant current (2.8 to 6.6 amps) to the power supply, a signal terminator 7, a central processing unit 8, and a console 9 are provided. The lamp 1 is connected in series with a slave station 2 and a power supply line 5 via a rubber transformer 3.

A master station 4 for transmitting and receiving signals to and from a plurality of lamps 1 is connected to a power supply line 5 via a rubber transformer 3. The power supply device 6, the master station 4, and the plurality of slave stations 1 are connected in a loop via the rubber transformer 3. The output voltage of the power supply device 6 is k
V order. The rubber transformer 3 is an insulating transformer having a turn ratio of 1: 1. The terminator 7 forms a filter so as to bypass the power supply device 1. The terminator 7 has a resistor for terminating a signal and a capacitor for cutting a lamp voltage.

Next, FIG. 2, FIG. 3, FIG. 4, and FIG.
And the master station 4 will be described.

The slave station 2 and the master station 4 are composed of common circuit elements. Microprocessor 10 for transmitting and receiving signals and controlling lamp 1; FROM 11 for storing operation programs and various parameters; and S for storing various information during operation.
RAM 12, a switch 13 for superimposing a signal on a power current and adjusting a current flowing through a lamp, a microprocessor 1
A photocoupler 14 for isolating the switch 13 from 0
Detector 1 for detecting power current and signal current by resistor
6. A phase detector 17 for detecting the phase of the power current by combining a low-pass filter and a comparator; a signal detector 18 for detecting a transmission / reception signal from the power current by combining a band-pass filter and a comparator; And a digital-to-analog converter 19 for inputting the current energy to the microprocessor, and a power supply 20 for extracting current energy from the power current and generating a voltage necessary for operating the slave station and the master station. Switch 13
Is composed of an electronic switch composed of FETs as shown in FIG.

In addition, the slave station 2 is provided with a voltage detecting resistor 21 for detecting a voltage applied to the lamp and a current transformer 15 for detecting a current. An analog input that converts the detected voltage value to a digital value and inputs it to the microprocessor
A digital converter 19 is provided.

The master station 4 is provided with a communication control unit 22 for communicating with the load resistor 1A and the central control unit 8.

Next, a method for estimating the remaining life of a lamp will be described.

The remaining life prediction process is performed by the slave station 2.

As shown in FIG. 8, when the lamp is used for a certain period of time, the filament evaporates and the resistance increases. Therefore, based on the information on the temporal change of the filament resistance value of the lamp 1 measured in advance, the resistance value at which the disconnection of the lamp 2 is expected is stored as the disconnection notice level r1 and the preventive maintenance execution level r2 in the storage unit 16. To be stored. A current and a voltage applied to the lamp 1 are measured, and a calculation is performed by the micro processor 12 based on the measured current value and the voltage value, an execution value of the current and the voltage is calculated, and a filament resistance value R of the lamp 2 is calculated. It is calculated from the following equation. [Rms] is an effective value.

R = V [rms] / I [rms] After calculating the resistance value, the microprocessor 12 determines whether the resistance value is r0, r0 to r1, r1 to r2, or broken, and The information is stored in the SRAM 12. SRAM
The lamp information stored in 12 is transmitted to the master station 4 by signal transmission and reception. Further, after it is determined that R ≧ r1, the method of turning on the switch 13 for a certain phase to make the voltage V applied to the lamp smaller than the rated value and extending the life of the lamp is within the scope of the present invention.

The method of estimating the pre-life and extending the life of the lamp can be realized irrespective of the signal transmission / reception method between the slave station 2 and the master station 4. When transmission / reception is performed by separately arranging signal lines. Is also within the scope of the present invention.

Next, signal transmission and reception between the slave station 2 and the master station 4 will be described with reference to FIG.

FIG. 4A shows the waveform of the signal (FIG. 2-A) transmitted by the microprocessor 10 of the master station 4. This signal is superimposed on the power current by the switch 13. FIG. 4B shows the voltage generated on the secondary side (FIG. 2-B) of the rubber transformer 3 connected to the master station 4 at this time. A current obtained by superimposing this signal has a waveform shown in FIG. 4C and flows through the rubber transformer 3 to the power supply line 5 (FIG. 2-C, FIG. 3-C). Is transmitted to The waveform of this power current is a sine wave having a peak value of about 10 amps (= 6.6 × √2) at the maximum, and the amplitude of the superimposed signal is about 10 milliamps. In the slave station 2, the detector 16 detects the current flowing on the secondary side of the rubber transformer 3 as shown in FIG. 4D and converts it into a voltage (FIG. 3-D). The voltage between the detector terminals is such that the power current component is a sine wave having a peak value of about 0.1 volt, and the amplitude of the signal component is about 100 microvolts.
From the voltage between the detector terminals, the phase detector 22 (FIG. 3E)
Generates a synchronization signal shown in FIG. 4-e, and further, the signal detection unit 23 (to FIG. 3-) demodulates the received signal into a pulse signal shown in FIG. 4-f. This pulse signal is
The measurement is performed by the processor 10, and it is determined whether or not the cycle matches a predetermined cycle.

Next, a method of setting a signal superimposed phase will be described.

The setting of the signal superposition phase is performed by the slave station 2 and the master station 4
It is implemented in. Assuming that the power supply device 6 supplies a constant current to the lamp 1 by thyristor control in order to perform brightness control of all the lamps (5 stages), the power current will be as shown in FIG.
As shown by −c, the waveform has a firing angle θ (100 ° to 180 °). The optimal phase for transmission and reception is a phase in which the power current flows stably after a certain time (approximately 1 millisecond) has elapsed from the phase with the largest current fluctuation. Therefore, the signal superimposition phase can be determined by obtaining the phase where the current fluctuation is the maximum.

The slave station 2 and the master station 4 convert the waveform obtained by extracting the power current flowing in the own station by the phase detector 17 into a digital signal by an A / D converter, and
To calculate the current variation, and determine the phase having the largest variation. The current value measured in this manner is stored in the SRAM 12 via the microprocessor 10. micro·
The processor 10 determines that the phase of the current
By setting the signal superposition phase after millisecond, transmission and reception can be performed regardless of the value of the supply current (2.8 to 6.6 amps).

FIG. 7 shows how signals are transmitted and received between the slave station 2 and the master station 4 in this manner.

Next, in order to extend the life expectancy of the lamp in power line transportation, the switch 13 is turned on for a predetermined phase to reduce the voltage V applied to the lamp to a value smaller than the rated value, and the lamp luminance for extending the life of the lamp is individually adjusted. A method for enabling control will be described.

FIG. 9 shows an example in which a signal current is superimposed on a lamp current waveform. An ON signal is sent to the switch 13, and the power current half cycle (0 ° to 180 °), (180 ° to 360 °)
During this period, the power current is not supplied to the lamp 1 for a certain period of time, and the power applied to the lamp 1 is reduced to extend the life of the lamp 1.

In order to prevent the signal superimposition phase and the luminance adjustment phase from overlapping each other, the signal superimposition phase is set for a certain period (θ1 to θ
2), (θ1 + 180 ° to θ2 + 180 °). For example, θ1 = 30 ° and θ2 = 60 °, and the brightness adjustment is performed by turning on the switch 13 in other periods.

Next, a method of setting the frequency of the high-frequency current used for communication will be described.

FIG. 10 is a flowchart for setting the transmission / reception frequency, and FIG.
Fig. 7 shows the transmission / reception signal frequency setting process.

After setting the frequency of the inquiry signal to a predetermined frequency (for example, 1 kHz), the master station 4 transmits the inquiry signal in two cycles in synchronization with the supply current, and then waits for two cycles of the power current. The master station 4 counts the wave number of the lamp supply current after transmission, and waits for a response from the slave station 2.
When each slave station 2 receives the inquiry signal transmitted by the master station 4 twice, it measures the frequency of the signal, sets the same frequency as the frequency received by its own station as a response signal, and counts the number of waves of the power current. Wait for the response transmission timing of the own station. As shown in FIG. 6, in synchronization with the next supply current cycle after the completion of the transmission of the master station, the slave stations 2 from address 1 to M sequentially transmit their own response signals every other cycle.

When the response signals of all the slave stations have been received,
The master station determines whether the number of receptions is M, and if the number is M, determines that the frequency is a communicable frequency and sets the frequency to a signal. If the number of receptions is not M, it is determined that the frequency cannot be communicated, the above operation is executed by changing the frequency of the inquiry signal by a predetermined increment value (for example, 100 Hz), and the number of receiving child stations is changed. Repeat until M is reached. Set the frequency to the upper limit (for example, 5 kHz)
If the number of M does not become M even after trials, the slave station with no answer is determined to be faulty or broken, and the slave station and the lamp are replaced.

The master station 4 sets the signal frequency at its own station,
Transmits the signal frequency for 3 cycles, then waits for 3 cycles. When the slave station 2 receives the inquiry signal transmitted by the master station for three cycles, the slave station 2 sets the frequency as the frequency of the control signal.

[0040]

According to the effects of the present invention, it is possible to predict the life expectancy of a lamp according to claim 1 and to secure the reliability of the lamp. According to the second aspect, the life expectancy of the lamp can be prolonged.
According to claims 3 and 4, signal transmission and reception can be made highly reliable.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a light control device.

FIG. 2 is a block diagram of a light control device slave station.

FIG. 3 is a block diagram of a light control device master station.

FIG. 4 is a detailed circuit diagram of a phase detection unit and a signal detection unit of the slave station and the master station.

FIG. 5 is a detailed circuit diagram of a signal transmission / current adjustment unit of a slave station and a master station.

FIG. 6 is a signal transmission waveform diagram between a slave station and a master station (in the case of a power current sine wave).

FIG. 7 is a signal transmission waveform diagram between a slave station and a master station (at the time of power current phase control).

FIG. 8 is a characteristic diagram of lamp lighting time-filament resistance value.

FIG. 9 is a diagram showing a relationship between a current waveform and a signal superimposed phase.

FIG. 10 shows a transmission / reception frequency setting flow.

FIG. 11 shows a transmission / reception frequency setting process.

FIG. 12 shows a transmission / reception frequency setting process and a control operation inquiry signal cycle.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Light, 1A ... Load resistor, 2 ... Substation, 3 ... Rubber transformer, 4 ... Master station, 5 ... Power supply line, 6 ... Power supply device, 7 ... Terminal device, 8 ... Central control device, 9 ... Operation console … 10… micro ・
Processor, 11 FROM, 12 SRAM, 13
Signal transmission / current control unit, 13A: Signal transmission unit, 14: Photocoupler, 15: Current measurement unit, 16: Detector, 17:
Phase detector, 18 signal detector, 19 analog-to-digital converter, 20 power supply, 21 voltage detection resistor, 22
... Communication control unit, 23 ... LPF phase detection, 24 ... Comparator, 25 ... BPF signal detection, 26 ... Comparator, 2
7 ... Gate voltage stabilization circuit

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Naohiro Sakaki 5-2-1 Omikacho, Hitachi City, Ibaraki Pref. Process Engineering Co., Ltd. (72) Inventor Hideo Otani 5-chome Omikacho, Hitachi City, Ibaraki Prefecture No. 1 Nippon Process Computer Engineering Co., Ltd. (72) Inventor Yasuharu Kamata 5-2-1 Omika-cho, Hitachi City, Ibaraki Prefecture Nippon Process Computer Engineering Co., Ltd. (72) Inventor Shoji Nakahara Omika, Hitachi City, Ibaraki Prefecture 5-2-1, Machi-cho, Omika Plant, Hitachi, Ltd. (72) Inventor Juichiro Atsumi 5-2-1, Omika-cho, Hitachi City, Ibaraki Prefecture Omika Plant, Hitachi, Ltd. (72) Satoshi Goto Ibaraki 5-2-1, Omika-cho, Hitachi City, Japan (72) Inventor Shoji Ikeda 5-2-1, Omika-cho, Hitachi City, Ibaraki Prefecture F-term (reference) 3K073 AA13 AA86 AA87 AA95 BA01 BA09 BA16 CB02 CD04 CE06 CE17 CG06 CG09 CG21 CH01 CH21 5K046 AA03 BB06 CC16 PP02 PS05 PS41 ZZ16

Claims (4)

[Claims] A plurality of lights, a rubber transformer, and a slave station disposed in a passage of an aircraft, and a power supply device for supplying commercial frequency power to the plurality of lights are connected in a loop by a power supply line disposed underground. In a lamp control device for detecting a core disconnection or ON / OFF control of a lamp, the slave station measures a current flowing in the lamp and a voltage generated in the lamp, and calculates a resistance value of the lamp from the current and the voltage. An airport light control device, wherein a remaining life of the light is predicted from a change with time of the resistance value. 2. A loop formed by a plurality of lights, a rubber transformer, and a slave station arranged in an aisle of an aircraft, a power supply device for supplying power of a commercial frequency to the plurality of lights, and a power supply line having a master station buried underground. In a light control device, a signal having a frequency higher than a commercial frequency is superimposed on the power supply line, a signal is transmitted and received between the slave station and the master station, and disconnection detection of the light and ON / OFF control are performed. Airport light control, wherein the phase in which the high-frequency signal is superimposed on the electric power current is limited to a range of electric angle values larger than 180 degrees and smaller than 360 degrees, so that the light brightness can be individually controlled. apparatus. 3. A loop formed by a plurality of lights, a rubber transformer, and a slave station disposed in a passage of an aircraft, a power supply device for supplying power of a commercial frequency to the plurality of lights, and a power supply line having a master station embedded in the ground. In a light control device, a signal having a frequency higher than a commercial frequency is superimposed on the power supply line, a signal is transmitted and received between the slave station and the master station, and disconnection detection of the light and ON / OFF control are performed. An airport light control device, wherein a phase at which the signal is superimposed on the power current is set to a value at a stable point of the power current. 4. A loop formed by a plurality of lights, a rubber transformer, and a slave station disposed in a passage of an aircraft, a power supply device for supplying power of a commercial frequency to the plurality of lights, and a power supply line having a master station buried underground. In a light control device, a signal having a frequency higher than a commercial frequency is superimposed on the power supply line, a signal is transmitted and received between the slave station and the master station, and disconnection detection of the light and ON / OFF control are performed. An airport light control device, characterized in that the signal frequency is set to a value that all the slave stations and the master station can transmit and receive by trial transmission and reception.