JP2008126779A - Signal lamp control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a signal lamp control device capable of diagnosing a failure during normal ignition control without visually recognizing flicking or instant lighting, even to a signal lamp using a light emitting element having high brightness as that in an LED and high response speed. <P>SOLUTION: The signal lamp control device comprises a diagnosis circuit 16 for passing a diagnosis current through a resistor 14, a control portion 11 carrying out the on/off-control of the signal lamp 5 and the on/off-control of the diagnosis current, and a current sensor 18 detecting both the signal lamp current flowing through the signal lamp 5 and the diagnosis current. The soundness of the current sensor 18 is determined from a change of an output K of the current sensor 18 according to the on/off-control of the diagnosis current. The failure about the lighting/extinguishing of the signal lamp is diagnosed from a result whether the output K of the current sensor changes in a state that the current sensor 18 is normal according to the on/off-control state of the signal lamp. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a signal lamp control apparatus that controls lighting / extinction of a signal lamp, and more particularly to a signal lamp control apparatus having a failure diagnosis function.

  The signal lamp control device used in the electronic interlocking system that ensures the safety of train operation in the station premises, etc. controls the lighting / extinguishing of the signal lamp according to the control information from the electronic interlocking device, and the signal lamp is turned on / off as instructed. A failure diagnosis for lighting is performed, and the diagnosis result is notified to the electronic interlocking device.

  For example, in the signal light control device shown in FIG. 4, a current sensor CT is provided on a common line of three signal lights LG, LY, and LR of red, yellow, and green, and every half cycle or several cycles of alternating current apart from normal on / off control. The signal lamp is instantaneously turned on / off at a period of time, and whether or not the output of the current sensor changes according to the instantaneous on / off control is monitored, so that the failure diagnosis is performed simultaneously during the signal lamp on / off control. (See Patent Document 1).

JP 61-13400 A

  Even when the signal lamp is instantaneously turned on and off as in the above technology, the response speed is relatively slow when the signal lamp is a filament light bulb, so that flickering occurs or the instantaneous lighting while off is visually recognized by the driver It never happened. However, in recent years, signal light emitters are changing from light bulbs to LEDs (Light Emitting Diodes) with features such as “long life, excellent visibility, responsiveness, high luminance, and low power consumption”. When a periodic on / off control is performed on a signal light that uses a light, a momentary flicker may occur due to a momentary off control during the on control, or a momentary lighting due to the momentary on control during the off control. In addition, there is a problem that an inductive noise voltage is generated in the control cable and the signal lamp being turned off is lightly lit.

  The present invention is intended to solve the above problem, and even for a signal light using a light emitting body with high brightness and a high response speed such as an LED, flickering and instantaneous lighting are not visually recognized. An object of the present invention is to provide a signal light control device capable of diagnosing a failure during control.

  The gist of the present invention for achieving the object lies in the inventions of the following items.

[1] a diagnostic circuit for flowing a diagnostic current to a predetermined load;
A control unit for performing on / off control of the signal lamp and on / off control of the diagnostic current;
A current sensor for detecting both the signal lamp current flowing through the signal lamp and the diagnostic current;
Have
The signal light control device, wherein the control unit performs a failure diagnosis related to the turn-off of the signal light from the on / off control state of the signal light and the diagnostic current and the output of the current sensor.

  In the above invention, the output of the current sensor changes in response to both the signal lamp current and the diagnostic current. The control unit performs failure diagnosis related to lighting / extinction of the signal lamp by comparing the on / off control state of the signal lamp, the on / off control state of the diagnostic current, and the output of the current sensor.

[2] When the output of the current sensor changes according to the on / off control of the diagnostic current, the current sensor is determined to be healthy, and the current sensor is in a healthy state according to the on / off control state of the signal lamp. The signal lamp control device according to [1], wherein the failure diagnosis is performed based on whether or not an output of the current sensor changes.

  In the above invention, the soundness of the current sensor is confirmed based on whether or not the output of the current sensor changes in accordance with the on / off control of the diagnostic current, and the energization / cutoff state of the signal lamp current is recognized by the current sensor whose soundness has been confirmed. A failure diagnosis is performed by comparing this with the on / off control state of the signal lamp.

[3] The signal lamp control device according to [1] or [2], wherein the current sensor is provided for each signal lamp to be controlled, and the diagnostic circuit is provided in common for the plurality of current sensors.

  In the above invention, when a plurality of signal lights such as red, yellow, and green are provided, or when a plurality of traffic lights are controlled, a current sensor is provided for each signal light, and a common diagnostic circuit is provided for them. The circuit configuration is simplified by sharing the diagnostic circuit.

[4] It has a first switch and a second switch inserted in series in the signal light drive circuit,
The signal lamp control according to any one of [1] to [3], wherein the control unit performs on / off control of the signal lamp by controlling opening and closing of both the first switch and the second switch. apparatus.

  In the above invention, since the signal light drive circuit is cut off / energized by the first switch and the second switch connected in series, erroneous lighting due to the switch being fixed ON occurs as compared with the case where only one switch is provided. The possibility can be reduced. If there are a plurality of switches connected in series, three or more switches may be used.

[5] The current sensor is a current sensor including a first input winding for flowing the signal lamp current and a second input winding for flowing the diagnostic current. [1] Thru | or [4] The signal light control device given in any 1 paragraph.

  According to the signal lamp control device according to the present invention, even for a signal lamp using a light emitting body having a high brightness and a fast response speed such as an LED, a fault diagnosis is performed during normal control without any flickering or instantaneous lighting being visually recognized. Thus, fail-safe and stable lighting / light extinction control is realized.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram showing a configuration example of a signal light control device 10 according to an embodiment of the present invention and a connection example between peripheral devices. The signal light control device 10 is connected to an electronic interlocking device 3 that ensures the safety of train operation in a station premises, etc., and performs lighting / extinguishing control of the signal light 5 based on the signal light control information from the electronic interlocking device 3. At the same time, it has a function of performing a fault diagnosis on the light extinction of the signal lamp 5 and notifying the electronic interlocking device 3 of the diagnosis result.

  The signal light control device 10 includes a control unit 11 and an input / output unit 12. The control unit 11 includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), an interface unit with the electronic interlocking device 3, and the like, which are not shown, as main parts. The control unit 11 executes various control operations in accordance with programs stored in the ROM.

  The input / output unit 12 is inserted in the drive circuit of the signal lamp 5 and cuts off the control switch 13 for cutting off / energizing the signal lamp current flowing through the drive circuit, the resistor (load) 14 and the diagnostic current flowing therethrough. / A diagnostic circuit 16 including a diagnostic switch 15 for energizing, and a current sensor 18 that detects both a signal lamp current flowing through the signal lamp 5 and a diagnostic current flowing through the diagnostic circuit 16.

  The control switch 13 and the diagnostic switch 15 are semiconductor switches, and the lamp control output S output from the control unit 11 is input to the control switch 13 as a control signal for opening / closing (cutoff / energization). The diagnostic output d output from the control unit 11 is input as an open / close control signal.

  The current sensor 18 is a through-type current sensor including a first input winding 18a for flowing a signal lamp current and a second input winding 18b for flowing a diagnostic current. The current sensor 18 is not limited to the through-type current sensor, and may be any sensor that detects both the signal lamp current and the diagnostic current with a single sensor.

  The signal lamp 5 is supplied with an AC voltage from the lamp power source 6 via the transformer 7. The drive circuit of the signal lamp 5 is configured by connecting the signal lamp 5, the control switch 13, the first input winding 18a, and the secondary side of the transformer 7 in series. The signal lamp 5 uses an LED as a light emitter. The signal light 5 may be a light bulb or an LED used as a light emitter.

  The diagnostic circuit 16 is supplied with power from the lamp power supply 6, and is configured by a circuit in which the lamp power supply 6, the resistor 14, the diagnostic switch 15, and the second input winding 18b of the current sensor 18 are connected in series. .

  The output K of the current sensor 18 is input to the control unit 11 as a diagnostic input. The output K of the current sensor 18 is an output value k1 corresponding to the signal lamp current when the signal lamp current is applied and the diagnostic current is interrupted, and according to the diagnostic current when the signal lamp current is interrupted and the diagnostic current is applied. The output value becomes k2. When the signal lamp current and the diagnostic current are energized and in phase, the output value k1 corresponding to the signal lamp current and the output value k2 corresponding to the diagnostic current are added, and the signal lamp current and the diagnostic current are energized. In the case of reverse phase, the difference value between the output value k1 corresponding to the signal lamp current and the output value k2 corresponding to the diagnostic current is obtained.

  Next, the operation of the signal lamp control device 10 will be described.

  Based on the signal lamp control information from the electronic interlocking device 3, the control unit 11 of the signal lamp control apparatus 10 creates control output data ("1" is turned on and "0" is extinguished), and according to the control output data The lamp control output S is output to open / close the control switch 13 to control the lighting / extinction of the signal lamp 5. Further, the diagnostic output d is output based on the diagnostic output data (energization at “1”, cutoff at “0”) to open / close the diagnostic switch 15, and the diagnostic current flowing through the diagnostic circuit 16 is turned on / off (energization / interruption) )Control. When the diagnostic switch 15 is controlled to open / close, a diagnostic current in a specified range is supplied / cut off to the second input winding 18 b of the current sensor 18 via the resistor 14.

  Specifically, when the diagnostic output d is on and the signal lamp 5 is in the off control, the control switch 13 is opened and the signal lamp current is not supplied to the first input winding 18a of the current sensor 18, and the second input winding 18b. Is supplied with a diagnostic current in a specified range. When the diagnostic output d is on and the signal lamp 5 is on, the control switch 13 is closed and a signal lamp current in a specified range is supplied to the first input winding 18a, and the second input winding 18b is A specified range of diagnostic current is applied.

  When the diagnostic output d is off and the signal lamp 5 is controlled to be off, the control switch 13 is opened, and the signal lamp current is not supplied to the first input winding 18a of the current sensor 18, and the second input winding 18b is also in the specified range. The diagnostic current is interrupted. When the diagnostic output d is off and the signal lamp 5 is on, the control switch 13 is closed, the signal lamp current in the specified range is supplied to the first input winding 18a, and the specified range is applied to the second input winding 18b. The diagnostic current of is not shut off.

  Therefore, by checking that the output K of the current sensor 18 has increased or decreased by a value (output value k2) corresponding to the diagnostic current within the specified range by controlling the diagnostic output d on and off, the current sensor 18 can be controlled in real time. Fault diagnosis can be performed. Then, it is confirmed that the output K of the current sensor 18 changes by a value corresponding to the signal lamp current in the specified range (output value k1) in accordance with the signal lamp control signal in a state where the current sensor 18 is confirmed to be healthy. By doing so, it is possible to perform failure diagnosis related to the lighting / extinction of the signal lamp 5.

  FIG. 2 illustrates the correspondence relationship between the diagnostic output d output from the control unit 11, the lamp control output S, and the output K of the current sensor 18 input as a diagnostic input. In this example, it is assumed that the signal lamp current flowing in the first input winding 18a of the current sensor 18 and the diagnostic current flowing in the second input winding 18b are in phase.

  FIG. 2A shows the diagnostic output d, and the control unit 11 continuously outputs the diagnostic output d that repeatedly turns on and off at a constant period (for example, several cycles of the AC voltage supplied from the lamp power supply 6). Output. FIG. 2B shows the lamp control output S. During the period T1, the signal lamp 5 is controlled to be on (lighted), and during the period T2, it is controlled to be off (dark).

  FIG. 2C shows the output K (diagnosis input) of the current sensor 18 in a normal case, and has a waveform such that the diagnosis output d and the lamp control output S are superimposed. The control unit 11 recognizes that the current sensor 18 is in a healthy state by changing the diagnostic input by a value corresponding to the diagnostic current in the specified range according to the on / off change of the diagnostic output d. For example, in the period T2 when the lamp control output S is off (0), it is confirmed that the diagnostic input is turned on (1) off (0) according to the on (1) off (0) of the diagnostic output d. Thus, it is determined that the current sensor 18 is healthy.

  In a state where the current sensor 18 is confirmed to be healthy, the lamp control is performed when the diagnostic input is changed by a value corresponding to the signal lamp current within the specified range in accordance with the on / off change of the lamp control output S. It is determined that the signal lamp 5 is normally turned on / off according to the output S. For example, the current value data obtained by subtracting the change corresponding to the diagnostic current from the diagnostic input K and the output data for control of the lamp control output S are collated, and it is normal if the increase / decrease in the current value data corresponds to the control output data. It is determined that the signal lamp 5 is turned on / off.

  FIG. 2D shows an example of a diagnostic input when the current sensor 18 has a failure. Since the diagnostic input does not change according to the on / off change of the diagnostic output d (always “0” in this example), it is determined that the current sensor 18 has failed. Although not shown, it is determined that the current sensor 18 has failed even when the diagnostic input is always “1” without depending on the on / off change of the diagnostic output d. In this case, fail-safety is ensured by taking the same measures as when a dangerous failure described later occurs.

  FIG. 2E shows a diagnostic input when a dangerous failure occurs in which the signal lamp 5 is always on (lit) regardless of whether the lamp control output S is on or off. The control unit 11 determines that the current sensor 18 is healthy because the diagnostic input changes by a value corresponding to the diagnostic current within the specified range in accordance with the diagnostic output d, and responds to the lamp control output S in that state. Since the diagnostic input does not change and the value after removing the value corresponding to the diagnostic current from the diagnostic input is fixed to the value corresponding to the signal lamp current in the specified range, the signal lamp 5 is fixed in the lighting state. It is determined that a dangerous failure has occurred.

  FIG. 2 (f) shows a diagnostic input when a safety-side failure occurs in which the signal lamp 5 is always off (dark) regardless of whether the lamp control output S is on or off. The control unit 11 determines that the current sensor 18 is healthy because the diagnostic input changes by a value corresponding to the diagnostic current within the specified range in accordance with the diagnostic output d, and responds to the lamp control output S in that state. Since the value after the diagnosis input does not change and the value corresponding to the diagnosis current is removed from the diagnosis input is fixed to “0”, there is a safety-side failure in which the signal lamp 5 is fixed in the extinguished state. Judge that it has occurred.

  In this way, when both the signal lamp current and the diagnostic current are detected by the current sensor 18 and the diagnostic current flowing through the diagnostic circuit 16 is on / off controlled, the output K (diagnostic input) of the current sensor 18 according to this control. The soundness of the current sensor 18 is confirmed by the change of, and the lighting / extinction of the signal lamp 5 is determined depending on whether or not the diagnostic input changes according to the on / off control of the lamp control output S in a state where the soundness is confirmed. Since the failure diagnosis regarding the lamp is performed, the failure diagnosis can be performed simultaneously (in real time) while the signal lamp 5 is operated. Further, since the signal lamp 5 is not instantaneously turned on / off for failure diagnosis, even when the signal lamp 5 using an LED as a light emitter is used, there is no flickering or instantaneous lighting, and stable visibility is ensured. be able to.

  Next, examples of the present invention will be described.

  FIG. 3 shows the configuration of the signal light control device 30. The signal lamp control device 30 shown in the embodiment controls a traffic light provided with a red signal lamp 5R, a yellow signal lamp 5Y, and a green signal lamp 5G, and has a function equivalent to that of the signal lamp control apparatus 10 shown in FIG. Although it is provided for three colors corresponding to 5R, 5Y, and 5G, the diagnostic circuit is made common, the fail-safe property is enhanced, and the light bulb type signal lamp is also supported.

  The signal light control device 30 includes a control unit 31 mainly including an interface unit with a CPU, ROM, RAM, and electronic interlocking device (not shown), and an input / output unit 32. The input / output unit 32 includes the lamp power supply 6, the resistor 14, the diagnostic switch 15, the second input winding between the terminals 3-4 of the R lamp current sensor CS-R, and the Y lamp current sensor CS. A diagnostic circuit is configured by connecting in series the second input winding between the terminals Y and Y of the -Y and the second input winding between the terminals 3 and 4 of the current sensor CS-G for the G lamp. . A diagnostic circuit for causing a diagnostic current to flow through the resistor 14 is provided in common with the G light current sensor CS-G, the Y light current sensor CS-Y, and the R light current sensor CS-R.

  The output of the G light current sensor CS-G is input to the control unit 31 as a G light diagnosis input a3, and the output of the Y light current sensor CS-Y is input to the control unit 31 as a Y light diagnosis input b3. The output of the current sensor CS-R is input to the control unit 31 as the R lamp diagnosis input c3.

  The input / output unit 32 includes a first G light control switch PS-G1 and a second G light control switch PS-G2 connected in series as a switch for cutting off / energizing the drive circuit of the green signal light 5G. The drive circuit of the signal lamp 5G is provided between the signal lamp 5G, the G-lamp control first switch PS-G1, the G-lamp control second switch PS-G2, and the terminal 1-2 of the G-lamp current sensor CS-G. The first input winding, the secondary side of the transformer 7, and the contact rg of the normal relay R are connected in series. The G light control first switch PS-G1 is controlled to open and close by the G light first control output a1 output from the control unit 31, and the G light control second switch PS-G2 is output from the control unit 31. Opening and closing is controlled by the second control output a2.

  The input / output unit 32 includes a Y-light control first switch PS-Y1 and a Y-light control second switch PS-Y2 connected in series as a switch for cutting off / energizing the drive circuit of the yellow signal lamp 5Y. The drive circuit of the signal lamp 5Y includes the signal lamp 5Y, the Y lamp control first switch PS-Y1, the Y lamp control second switch PS-Y2, and the terminal 1-2 of the Y lamp current sensor CS-Y. The first input winding between them, the secondary side of the transformer 7 and the contact ry of the normal relay R are connected in series. The Y lamp control first switch PS-Y1 is controlled to open and close by the Y lamp first control output b1 output from the control unit 31, and the Y lamp control second switch PS-Y2 is output from the control unit 31. Opening and closing is controlled by the second control output b2.

  Further, the input / output unit 32 includes a first R-light control switch PS-R1 and a second R-light control switch PS-R2 connected in series as a switch for cutting off / energizing the drive circuit of the red signal light 5R. The drive circuit of the signal lamp 5R is provided between the signal lamp 5R, the R lamp control first switch PS-R1, the R lamp control second switch PS-R2, and the terminal 1-2 of the R lamp current sensor CS-R. The first input winding, the secondary side of the transformer 7, and the contact rr of the normal relay R are connected in series. The R-light control first switch PS-R1 is controlled to open and close by the R-light first control output c1 output from the control unit 31, and the R-light control second switch PS-R2 is output from the control unit 31. Opening and closing is controlled by the second control output c2.

  Each of the switches PS-G1, PS-G2, PS-Y1, PS-Y2, PS-R1, and PS-R2 is composed of a semiconductor switch.

  Each contact rg, ry, rr of the normal relay R is closed when the device normal output f of the control unit 31 is on (during the normal relay R operation), and when the device normal output f is off (normal relay). -When R is restored)

  In addition, the input / output unit 32 includes a zero-cross detection circuit ZCD that is connected in parallel to the output of the lamp power supply 6 and detects a zero-cross of the AC output of the lamp power supply 6. The output of the zero-cross detection circuit ZCD is sent to the control unit 31. It is input as zero cross input e.

  Next, the operation of the signal lamp control device 30 will be described.

  At the time of power-on of the device, the control unit 31 diagnoses the failure of the memory, initializes the signal lamp control outputs a1, a2, b1, b2, c1, c2 and the diagnostic output d to the off control state (0), zero cross input A start-up process such as frequency detection of the lamp power supply 6 by e is performed, and after checking that there is no abnormality in the apparatus, the apparatus normal output f is output to operate the normal relay R.

  After startup, the control output data of the signal lamp control outputs a1, a2, b1, b2, c1, c2 created based on the signal lamp control information received from the electronic interlocking device 3, the diagnostic output data of the diagnostic output d, Signal lamp currents and diagnostic currents flowing through the respective signal lamps 5G, 5Y, and 5R via the semiconductor switches PS-G1, PS-G2, PS-Y1, PS-Y2, PS-R1, PS-R2, and 15 operating at their outputs. Is checked against current value data generated based on the diagnostic inputs a3, b3, and c3 output from the current sensors CS-G, CS-Y, and CS-R at a constant cycle. . The failure determination method for each of the current sensors CS-G, CS-Y, CS-R and the signal lights 5R, 5G, 5Y is the same as that of the signal light control device 10, and the description thereof is omitted.

  When the control unit 31 detects a safety-side failure as a result of the failure diagnosis, the control unit 31 creates the failure content as maintenance data and reflects it in the display information notified to the electronic interlocking device 3. In addition, when a dangerous security is detected, the details of the failure are created as maintenance data, reflected in the display information notified to the electronic interlocking device 3, and the normal output f is stopped to restore the normal relay R. The signal lights 5G, 5Y, and 5R are disconnected from the power source (transformer 7) to turn off the signal lights 5G, 5Y, and 5R. If it is determined that the current sensor is not healthy, the fail-safe property is ensured by taking the same measures as the dangerous failure. In addition to the maintenance data, the display information includes information indicating the control result (lighting / extinguishing state) of each signal lamp.

  In the signal lamp control device 30, two signal lamp control outputs (a1 and a2, or b1 and b2, or c1 and c2) and two series-connected semiconductor switches (PS-G1) are used for on / off control of the signal lights 5G, 5Y, and 5R. And PS-G2, or PS-Y1 and PS-Y2, or PS-R1 and PS-R2), either one circuit (control output or semiconductor switch) conduction failure (on-state fixed The operating rate can be improved by avoiding erroneous lighting caused by failure. The two signal lamp control outputs (a1 and a2, or b1 and b2, or c1 and c2) related to the same signal lamp are preferably generated independently and output from the control unit 31, but are connected in series. One semiconductor switch may be configured to be turned on / off by one signal light control output.

  When the signal lamp is a light bulb, an excessive inrush current is generated at the start of the on-control, so that suppression control is necessary, and the signal lamp control device 30 performs the control as follows.

  Based on the zero cross input e from the output terminal 1 of the zero cross detection circuit ZCD in which the output of the lamp power source 6 is connected to the input terminal 2-3, the timing and the power frequency of the zero cross point of the lamp power source 6 are detected and the signal lamp control output is performed. By controlling the output timings of a1, a2, b1, b2, c1, and c2, the signal lamp current distribution angle in the half cycle of the power supply frequency is controlled to perform warm-up lighting. Thereby, the inrush current at the start of the on-control can be suppressed, and the signal lamp control device 30 can cope with a signal lamp using either an LED or a light bulb as a light emitter.

  As described above, the signal light control devices 10 and 30 can perform failure diagnosis in parallel (in real time) while operating the signal light, so that fail-safety can be ensured and the signal light is instantaneously used for failure diagnosis. Since on / off control is not performed, there is no flickering or instantaneous lighting even when a signal lamp using an LED as a light emitter is used, and stable visibility can be ensured. In addition, since the instantaneous on / off control is not performed, it is possible to prevent the light from being lighted during the off control due to voltage generation due to induction noise.

  Although the embodiments and examples of the present invention have been described with reference to the drawings, the specific configuration is not limited to the illustrated ones, and even if there are changes or additions without departing from the gist of the present invention. It is included in the present invention.

  For example, the output timing of the diagnostic output d, the on / off cycle, or the timing of collation for failure diagnosis are not limited to those exemplified in the embodiment, and may be changed as appropriate. Also, in the case where multiple color signal lights are alternately lit, if the signal lamp current sensor is checked for soundness when the signal light is off-controlled, the current in the state where the signal lamp current is interrupted The soundness of the sensor can be confirmed, and confirmation becomes easy.

  In addition, the light emitters of the signal lamps are not limited to LEDs and light bulbs, but may be other types of light emitters as long as a current flows during light emission.

It is a block diagram which shows the structure of a signal light control apparatus in embodiment of this invention. It is a wave form diagram which shows the correspondence of a signal lamp control signal, a diagnostic output, and a diagnostic input. It is a block diagram which shows the structure of the signal light control apparatus which concerns on the Example of this invention. It is a block diagram which shows the structure of the conventional signal light control apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 3 ... Electronic interlocking device 5 ... Signal lamp 5G ... Green signal lamp 5R ... Red signal lamp 5Y ... Yellow signal lamp 6 ... Lamp power supply 7 ... Transformer 10 ... Signal lamp control apparatus 11 ... Control part 12 ... Input / output part 13 ... Control switch DESCRIPTION OF SYMBOLS 14 ... Resistor 15 ... Diagnosis switch 16 ... Diagnostic circuit 18 ... Current sensor 18a ... 1st input winding 18b ... 2nd input winding 30 ... Signal lamp control device 31 ... Control part 32 ... Input / output part a1, a2, b1 , B2, c1, c2 ... Signal lamp control output a3 ... G lamp diagnostic input b3 ... Y lamp diagnostic input c3 ... R lamp diagnostic input CS-G ... G lamp current sensor CS-R ... R lamp current sensor CS-Y ... Current sensor for Y lamp d ... Diagnostic output K ... Output of current sensor k1 ... Output value of current sensor corresponding to signal lamp current k2 ... Output value of current sensor corresponding to diagnostic current PS-G1 ... First switch for G lamp control PS-G2 2nd switch for G light control PS-R1 1st switch for R light control PS-R2 2nd switch for R light control PS-Y1 1st switch for Y light control PS-Y2 2nd switch for Y light control 2 switch R ... Normal relay
S ... Light control output ZCD ... Zero cross detection circuit

Claims (5)

A diagnostic circuit for passing a diagnostic current to a predetermined load;
A control unit for performing on / off control of the signal lamp and on / off control of the diagnostic current;
A current sensor for detecting both the signal lamp current flowing through the signal lamp and the diagnostic current;
Have
The signal light control device, wherein the control unit performs a failure diagnosis related to the turn-off of the signal light from the on / off control state of the signal light and the diagnostic current and the output of the current sensor. When the output of the current sensor changes according to the on / off control of the diagnostic current, the current sensor is determined to be healthy, and the current sensor is controlled according to the on / off control state of the signal lamp under the healthy state of the current sensor. The signal lamp control device according to claim 1, wherein the failure diagnosis is performed based on whether or not an output changes. The signal light control device according to claim 1, wherein the current sensor is provided for each signal light to be controlled, and the diagnostic circuit is provided in common for the plurality of current sensors. A first switch and a second switch inserted in series in the signal light drive circuit;
4. The signal light control device according to claim 1, wherein the control unit performs on / off control of the signal light by performing opening / closing control of both the first switch and the second switch. 5. 5. The current sensor according to claim 1, wherein the current sensor comprises a first input winding for flowing the signal lamp current and a second input winding for flowing the diagnostic current. The signal light control device according to any one of the above.

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