JP5030937B2 - Signal lamp disconnection detector - Google Patents

Description

  The present invention relates to a signal lamp disconnection detecting device for detecting disconnection of a signal lamp.

  The railway system that forms the backbone of social transportation infrastructure requires a high level of stable system operation. In the unlikely event that a city railroad that is a mass transit system stops for a long time, the damage to society is immeasurable. Even in the railway signal control system that controls the operation of the railway, the realization of a system with a higher operation rate is an urgent issue.

  In order to realize this high operation rate, the signal lamp control device responsible for controlling the lighting of the signal lamp in the railway signal control system is often equipped with a signal lamp disconnection detection device that detects disconnection of the signal lamp and disconnection of the connection wiring. .

  Railway signal lights fail at a certain probability due to external factors such as the life of parts used and accidents. The signal light that has failed and turned off is considered equivalent to a stop signal by the rules of railway operation, so the driver stops the train. Stopping the train avoids safety problems, but reduces the overall availability of the railway system. In order to prevent such a problem, it is only necessary to detect a failure of the signal light in a state in which the signal light is not controlled on the railway signal control system, that is, the signal light is turned off.

  This is because if a failure is detected, repaired, and replaced before the lighting control of the signal lamp is performed, the operation of the train is not hindered and a reduction in the operating rate of the railway system can be prevented. For this reason, the signal lamp disconnection detecting device described above is required to be able to detect the disconnection of the signal lamp and the connection wiring in a state where the signal lamp is turned off.

As a disconnection detection circuit for detecting disconnection of a signal lamp and disconnection of a connection wiring in a state where the signal lamp is turned off, a method as described in Patent Document 1 has been proposed. In this method, a small diagnostic current that does not light the load signal lamp is applied to the load, and if the diagnostic current flows through the load, it is normal, and the diagnostic current flows through the diagnostic current detection circuit connected in parallel with the load. If it is determined, it is determined to be broken.
JP 2005-59623 A

  However, this method limits the types of signal lamps to be detected. This is because the current used as the diagnostic current must be a value at which the signal lamp does not light up reliably and a value at which the diagnostic current detection circuit operates reliably.

  In recent years, light emitting elements used for signal lamps are shifting from light bulbs to LEDs, and the current for lighting signal lamps tends to decrease. For this reason, it is necessary to use a current having a lower value than that of the conventional diagnosis current, which increases the difficulty in circuit design. Moreover, it is difficult for the disconnection detection circuit of the present system, which is designed to detect a specific type of signal lamp, to detect another type of signal lamp. This is because it must be ensured that the current value selected as the diagnostic current does not cause other types of signal lights to be erroneously lit.

  The object of the present invention is applicable to various signal lamps, and is capable of detecting disconnection of signal lights and disconnection of connection wiring without erroneously lighting the signal lamps even when the signal lamps are controlled to be turned off. Is to provide.

The signal lamp breakage detection device of the present invention is a signal lamp breakage detection apparatus for detecting breakage of a signal lamp and disconnection of wiring, wherein the breakage detection power supply, the voltage detector, and the breakage detection power supply are connected to the signal lamp. A high-impedance resistor that suppresses the current so that the signal lamp does not erroneously light even when applied to the signal lamp, and the voltage detector detects the voltage across the signal lamp without causing the signal lamp to be erroneously lit. In the signal lamp breakage detecting device capable of determining the breakage of the signal lamp, the power supply for driving the signal lamp is used as the power supply for detecting breakage, and the high impedance resistor is connected in series to the power supply for driving the signal lamp, A disconnection detection capacitor is connected in parallel to the signal lamp, and the first switch for switching the connection between the disconnection detection capacitor and the signal lamp is turned off and disconnected. The second switch for connecting the signal lamp driving power source and the signal lamp is turned on, and the voltage at both ends of the disconnection detection capacitor reaches the voltage determined by the impedance ratio between the high impedance resistor and the signal lamp. The charge of the disconnection detection capacitor is accumulated, and when the charge is accumulated in the disconnection detection capacitor, the first switch is turned on, and the voltage across the disconnection detection capacitor is changed by the voltage detector. takes in determining the cross-sectional core of the signal lamp, the rear of the determination end, characterized Ofusu Rukoto the second switch.

  The signal lamp disconnection detecting device of the present invention can be applied to various signal lamps, and can detect the disconnection of the signal lamp and the connection wiring as a load without erroneously lighting the signal lamp when the signal lamp is turned off. is there.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a signal lamp breakage detecting device of the present invention will be described with reference to the drawings.

  In the configuration of FIG. 1, the signal lamp control device 5 performs lighting control by applying a voltage to the signal lamp 6. The signal lamp breakage detection device 1 according to the present invention is connected to a wiring connecting the signal lamp control device 5 and the signal lamp 6 and includes a breakage detection power source 3, a resistor 2, and a voltage detection device 4. The disconnection detection of the signal lamp 6 is performed while the signal lamp 6 is controlled to be turned off.

  The disconnection detection power source 3 applies a voltage to the signal lamp 6 through the resistor 2. At this time, in order to prevent erroneous lighting of the signal lamp 6, a sufficiently high value is selected for the impedance of the resistor 2. Specifically, since the impedance of the signal lamp is generally between several ohms and 1 kilo ohm, it is set to 10 kilo ohms or more, which is 10 times higher than this.

  The voltage detection device 4 detects a voltage having a value obtained by multiplying the impedance ratio of the signal lamp 6 and the resistor 2 by the output voltage of the disconnection detection power source 3. If the signal lamp 6 is normal, the impedance of the signal lamp 6 is much lower than the impedance of the resistor 2, so that the voltage detection device 4 detects only a low voltage. On the contrary, when the signal lamp 6 is disconnected, the voltage detection device 4 detects a voltage substantially equal to the output voltage of the disconnection detection power source 3. It is possible to determine whether or not the signal lamp 6 is disconnected based on the difference in the detection voltage.

  FIG. 2 shows the relationship between the voltage of the disconnection detecting power source 3 and the impedances of the resistor 2 and the signal lamp 6 in the above series of procedures. As shown in FIG. 2, in the present invention, a diagnostic current of 10 milliamperes or less is used. If the diagnostic current is 10 milliamperes or less, the signal lamp will not light up erroneously.

  A capacitor may be used in place of the power supply for detecting the disconnection of the signal lamp disconnection detecting device. When a capacitor is used, it is not necessary to prepare a separate power supply for detecting disconnection, so that the circuit configuration can be simplified. The configuration of the second embodiment of the present invention is shown in FIG.

  Further, a power source for driving a signal lamp may be used as a power source for detecting disconnection. The configuration of Example 3 of the present invention is shown in FIG. Also in this case, it is not necessary to prepare a power supply for detecting disconnection, and the circuit configuration can be simplified. In addition, even when the turn-off time of the signal lamp becomes longer, the signal lamp breakage detection operation can always be performed unlike the configuration of FIG.

  Embodiment 4 of the present invention will be described below with reference to the drawings. FIG. 5 is a configuration diagram of a signal lamp control system using the signal lamp breakage detecting device according to the fourth embodiment of the present invention. In the system of FIG. 5, the signal lamp control device 5 is connected to the signal lamp 6 via the signal lamp disconnection detecting device 1. The signal lamp control device 5 performs lighting control by supplying current from the signal lamp drive power supply 8 to the signal lamp 6. This lighting control is executed by controlling a switch inside the signal light control device 5.

  FIG. 6 is a flowchart showing a procedure for detecting disconnection of the signal light control system of FIG. As shown in FIG. 6, the disconnection detection of the signal lamp 6 is performed according to the following procedure. First, in step 601, the switch 9 is turned on. As a result, in step 602, the voltage of the signal lamp drive power supply 8 is applied to the signal lamp 6 through the resistor 2 as the disconnection detection power supply 3. If the impedance of the resistor 2 is sufficiently high, the signal lamp 6 will not be erroneously turned on by this operation.

  Next, in step 603, the changeover switches 11 and 12 are changed over to the direction in which the capacitor 10 is connected to the signal lamp. As a result of this operation, in step 604, electric charge is accumulated in the capacitor 10 until the voltage at both ends reaches a voltage determined by the impedance ratio of the resistor 2 and the signal lamp 6.

  After a sufficient time for the electric charge to be accumulated in the capacitor 10 has elapsed, in step 605, the changeover switches 11 and 12 are switched in a direction in which the capacitor 10 is connected to the voltage detection device 13. In step 606, the voltage across the capacitor 10 at this time is captured by the voltage detection device 13. If the signal lamp 6 is disconnected, a voltage almost equal to the output voltage of the signal lamp drive power supply 8 is detected. If the signal lamp 6 is normal, a low voltage corresponding to the impedance ratio of the resistor 2 and the signal lamp 6 is detected. .

  Finally, in step 607, the switch 9 is turned off. The reason why the switch 9 is turned on only during the disconnection detection operation is to prevent the voltage from being constantly applied to the signal lamp during the turn-off control of the signal lamp.

  According to this method, the current flowing through the signal lamp during the disconnection detection operation can be made extremely small. This is because even if the current is reduced, it is sufficient to increase the charging time for the capacitor 10. For this reason, it is possible to select a current value at which all of the signal lamps that can be controlled are not erroneously turned on.

  Further, if the capacitance of the capacitor 10 is selected so that the energy of the charge charged in the capacitor 10 is sufficiently larger than the energy of external noise that may be applied to the signal lamp 6 and the wiring, The influence of disturbance due to external noise can be minimized.

FIG. 1 is a configuration diagram illustrating a signal lamp breakage detecting device according to a first embodiment of the present invention. FIG. 2 is a graph showing a region of a diagnostic current according to the present invention. FIG. 3 is a configuration diagram illustrating a signal lamp breakage detecting device according to a second embodiment of the present invention. FIG. 4 is a configuration diagram illustrating a signal lamp breakage detecting device according to a third embodiment of the present invention. FIG. 5 is a configuration diagram illustrating a signal lamp control system using the disconnection detecting device according to the fourth embodiment of the present invention. FIG. 6 is a flowchart showing a procedure for detecting disconnection of the signal light control system of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Signal lamp break detection apparatus 2 Resistance 3 Break detection power supply 4 Voltage detection apparatus 5 Signal lamp control apparatus 6 Signal lamp 7 Capacitor 8 Signal lamp drive power supply 9 Switch 10 Capacitor 11 Change switch 12 Change switch 13 Voltage detection apparatus

Claims (2)

A signal lamp sectional core detecting device for detecting the disconnection of the sectional cores and the wiring of the signal light, the cross-sectional core sensing power supply, the voltage detector and the cross-sectional core also detect power source is applied to the signal lamp the signal lamp false lighting A high-impedance resistor that suppresses the current so that the signal detector can detect the disconnection of the signal lamp without erroneously lighting the signal lamp by detecting the voltage across the signal lamp with the voltage detector. In signal lamp disconnection detection device,
Using a power source for driving a signal lamp as the power source for detecting disconnection,
The high impedance resistor is connected in series to the power source for driving the signal lamp,
A disconnection detection capacitor is connected in parallel to the signal lamp,
With the first switch that switches the connection between the disconnection detecting capacitor and the signal lamp turned off,
A second switch for connecting the signal lamp driving power source and the signal lamp is turned on;
Accumulating the charge of the disconnection detection capacitor until the voltage across the disconnection detection capacitor reaches a voltage determined by the impedance ratio between the high impedance resistor and the signal lamp,
When charge is accumulated in the disconnection detecting capacitor, the first switch is turned on,
The signal detector detects the disconnection of the signal lamp by taking in the voltage across the disconnection detection capacitor by the voltage detector, and turns off the second switch after the determination is completed. apparatus. The capacitance of the disconnection detection capacitor is selected so that the energy of the charge charged in the disconnection detection capacitor is larger than the energy applied to the signal lamp. Signal light breakage detection device.

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