JP2012204207A - Marker lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a marker lamp capable of determining, on a supply side of AC constant-current power, the abnormality of the marker lamp.SOLUTION: A marker lamp 12 comprises a semiconductor light-emitting element 17, a switch circuit 18, a lighting control circuit 20, and an abnormal signal output circuit 21. The lighting control circuit 20 inputs AC constant-current power so as to perform lighting control of the semiconductor light-emitting element 17, and also monitors lighting operation. The abnormal signal output circuit 21 outputs an abnormal signal to the switch circuit 18 based on the abnormality determination of lighting operation performed by the lighting control circuit 20. The switch circuit 18 is provided on an AC constant-current power input side of the lighting control circuit 20, and opens the AC constant-current power input side of the lighting control circuit 20 when the abnormal signal is inputted.

Description

  Embodiments described herein relate generally to a marker lamp that controls lighting of a semiconductor light emitting element with a lighting control circuit.

  Conventionally, in a marker lamp system that controls lighting of a marker lamp installed on a runway or taxiway at an airport, an AC constant current power source is supplied from the AC constant current control device to the marker lamp through a rubber-coated insulation transformer. Yes. When the light source of the marker lamp is a light bulb, AC constant current power is supplied to the light bulb, and the light bulb is turned on. Also, when the bulb is broken, an overvoltage occurs on the secondary side of the rubber-covered insulated transformer that has become unloaded, and based on this, the bulb's breakage is determined on the AC constant current controller side. Is possible.

  In addition, there is a marker lamp using an LED element as a light source. In this marker lamp, a lighting control circuit is used to light the LED element. Even if the LED element breaks down, an overvoltage is generated by the function of the lighting control circuit. It has a protective function to prevent it from occurring. For this reason, no overvoltage is generated on the secondary side of the rubber-covered insulated transformer, and the abnormality of the marker lamp cannot be determined on the AC constant current control device side.

Japanese Patent Laid-Open No. 10-214394

  In a marker lamp that controls lighting of an LED element by a lighting control circuit, there is a problem that an abnormality of the marker lamp cannot be determined on the supply side of the AC constant current power source.

  The problem to be solved by the present invention is to provide a marker lamp that can determine the abnormality of the marker lamp on the supply side of the AC constant current power source.

  The marker lamp of the embodiment includes a semiconductor light emitting element, a switch circuit, a lighting control circuit, and an abnormal signal output circuit. The lighting control circuit inputs an AC constant current power supply to control the lighting of the semiconductor light emitting element and monitors the lighting operation. The abnormal signal output circuit outputs an abnormal signal to the switch circuit by the abnormality determination of the lighting operation in the lighting control circuit. The switch circuit is provided on the AC constant current power source input side of the lighting control circuit, and opens the AC constant current power source input side of the lighting control circuit when an abnormal signal is input.

  According to the present invention, in a marker lamp that controls the lighting of a semiconductor light emitting element with a lighting control circuit, the AC constant current power supply input side of the lighting control circuit is opened to be in a no-load state when an abnormality occurs in the marker lamp. It can be expected that the abnormality of the marker lamp can be determined on the constant current power supply side.

It is a circuit diagram of the marker lamp which shows one Embodiment.

  Hereinafter, an embodiment will be described with reference to FIG.

  The marker lamp system 11 of the present embodiment is an aerial marker lamp system that controls lighting of a plurality of marker lamps 12 installed on, for example, an airport runway or a taxiway.

  In this marker lamp system 11, the primary side of the rubber-coated insulating transformer 14 is connected to an AC constant current control device 13 that supplies an AC constant-current power source, and the marker lamp 12 is connected to the secondary side of the rubber-coated insulating transformer 14 Has been.

  The indicator lamp 12 includes a semiconductor light emitting element 17 as a light source, a switch circuit 18 connected to the secondary side of the rubber-covered insulation transformer 14, a current transformer 19 having a primary side connected to the switch circuit 18, and a current transformer. A lighting control circuit 20 connected to the secondary side of 19 for controlling the lighting of the semiconductor light emitting element 17 and an abnormal signal output circuit 21 for outputting an abnormal signal to the switch circuit 18 when an abnormality occurs in the marker lamp 12 are provided.

  For example, an LED element or an EL element is used as the semiconductor light emitting element 17. In the present embodiment, a plurality of LED elements 17a are used.

  The switch circuit 18 is a pair of terminals interposed between both ends of the secondary side of the rubber-coated insulating transformer 14 and both ends of the primary side of the current transformer 19 (AC constant current power input side of the lighting control circuit 20). The switch 23 is provided. As this switch circuit 18, a manual return type switch is used, a pair of switches 23 are turned on by mechanical operation, and the secondary side of the rubber-covered insulation transformer 14 and the primary side of the current transformer 19 (the lighting control circuit 20 The AC constant current power supply input side) is energized, and when an abnormal signal is input, the pair of switches 23 are turned off by the electric drive means, and the secondary side of the rubber-covered insulated transformer 14 and the primary side of the current transformer 19 (The AC constant current power supply input side of the lighting control circuit 20) is opened, and a no-load state is established.

  Further, the current transformer 19 converts the AC constant current power input from the rubber-covered insulated transformer 14 into a current value for lighting the LED element 17a and outputs the current value to the lighting control circuit 20.

  In the lighting control circuit 20, an AC constant current power supply on the secondary side of the current transformer 19 is input to the lighting power supply circuit 25, and further input to the control power supply circuit 27 via the current transformer 26. The current is input to the current detection circuit 29 via 28.

  The lighting power supply circuit 25 rectifies the AC constant current power supply on the secondary side of the current transformer 19 with the rectifier 30, adjusts the current to be constant with the load adjustment circuit 31, smoothes it with the smoother 32, and supplies it to the LED element 17a. . The load adjustment circuit 31 is feedback-controlled by the control unit 33 that detects the current flowing through the LED element 17a, and adjusts the current flowing through the LED element 17a to be constant.

  A series circuit of a plurality of LED elements 17a, a lighting control circuit 34, and a lighting current detection circuit 35 is connected to the smoother 32 of the lighting power supply circuit 25. The lighting control circuit 34 includes, for example, a switching element, and the switching element is duty-controlled by the control unit 33, thereby adjusting the current flowing through the LED element 17a so that the LED element 17a has a predetermined luminous intensity. The lighting current detection circuit 35 detects the current flowing through the LED element 17a and outputs it to the lighting detection circuit 36. The lighting detection circuit 36 detects the lighting state of the LED element 17 a based on the current detected by the lighting current detection circuit 35, and outputs this lighting detection information to the control unit 33.

  The control power supply circuit 27 supplies control power to the control unit 33 and the abnormal signal output circuit 21. The control power supply circuit 27 inputs the AC constant current power supply on the secondary side of the current transformer 19 to the rectifier 38 via the current transformer 26, rectifies the rectifier 38, and adjusts the voltage to a constant level by the load adjustment circuit 39. Smoothing with the smoother 40. The control voltage smoothed by the smoother 40 is supplied to the control unit 33 by the control voltage circuit 41 as a predetermined control voltage.

  The control unit 33 is configured by a CPU and has a control function for controlling the lighting operation and a monitoring function for monitoring the lighting operation.

  As a control function of the control unit 33, a current control function that feedback-controls the load adjustment circuit 31 so that the current flowing through the LED element 17a detected by the lighting current detection circuit 35 is constant, and is detected by the lighting current detection circuit 35. A light intensity control function for controlling the lighting control circuit 34 so that the LED element 17a lights up at a predetermined light intensity based on the current value, and when the LED element 17a fails in an open state, an overcurrent is generated because it is a current source. Although it occurs, it has an overcurrent protection function for controlling a protection circuit (not shown) so that the circuit does not break down due to the overcurrent.

It has a protective function.

  The monitoring function of the control unit 33 includes an input current monitoring function for monitoring the input current from the current detection circuit 29, a load current monitoring function for monitoring the current flowing through the LED element 17a detected by the lighting current detection circuit 35, and a lighting detection. A lighting monitoring function for monitoring the lighting of the LED element 17a by a signal from the circuit 36, a control voltage monitoring function for monitoring a control voltage supplied from the control power supply circuit 27, and the like.

  As a result of monitoring by each monitoring function, the control unit 33 determines that an abnormal signal (operation monitoring signal) is output as an abnormal signal output circuit 21 when any one monitoring item exceeds the normal lighting operation range. Output to. The control unit 33 also outputs an operation signal, which is a pulse signal that alternately outputs an H level signal and an L level signal at a predetermined interval, when the control unit 33 is operating normally. Output to.

  Further, the abnormality signal output circuit 21 determines an abnormality of the control unit 33 when an operation signal (a pulse signal in which an H level signal and an L level signal are alternately switched at a predetermined interval) is not input from the control unit 33. A control unit abnormality determination circuit 43 and an interface circuit 44 that outputs an abnormality signal from the control unit abnormality determination circuit 43 and an abnormality signal from the control unit 33 to the switch circuit 18 are provided.

  Next, the operation of the marker lamp system 11 will be described.

  First, during normal operation of the indicator lamp 12, the pair of switches 23 of the switch circuit 18 are turned on, and the AC constant current power input from the rubber-covered insulation transformer 14 is output to the lighting control circuit through the current transformer 19. Yes. The control power supply circuit 27 supplies control power to the control unit 33 and the abnormal signal output circuit 21. Then, the control unit 33 controls the load adjustment circuit 31 and the lighting control circuit 34 to control the lighting of the LED element 17a.

  The control unit 33 monitors each monitoring item with the input current monitoring function, the load current monitoring function, the lighting monitoring function, and the control voltage monitoring function. Here, each monitoring item is within the range of normal lighting operation. There is no abnormal signal output. Further, an operation signal (a pulse signal that alternately outputs an H level signal and an L level signal at a predetermined interval) is output to the control unit abnormality determination circuit 43 of the abnormality signal output circuit 21.

  In addition, if any one of the monitoring items of the control unit 33 exceeds the normal lighting operation range and determines that an abnormality has occurred, an abnormal signal is output to the abnormal signal output circuit 21. An abnormal signal is output from the interface circuit 44 of the abnormal signal output circuit 21 to the switch circuit 18.

  In the switch circuit 18, when an abnormal signal is input from the abnormal signal output circuit 21, the pair of switches 23 are forcibly turned off by the electric drive means.

  By turning off the pair of switches 23, the space between the secondary side of the rubber-covered insulating transformer 14 and the primary side of the current transformer 19 is completely opened, and no load is applied.

  Further, by turning off the pair of switches 23, power supply to the lighting control circuit 20 and the abnormal signal output circuit 21 is stopped, and the abnormal signal output from the control unit 33 is not input to the switch circuit 18, but the switch circuit 18 Since it is a manual return type switch, it is not turned on unless mechanical operation is performed.

  Then, when the secondary side of the rubber-covered insulated transformer 14 is opened, an overcurrent is generated, which can be detected by the AC constant current control device 13, and the abnormality of the marker lamp 12 can be grasped.

  In addition, when a failure such as a stop of software operating in the control unit 33 occurs, all functions of the control unit 33 are stopped. In this case, circuits other than the control unit 33 are operating normally.

  When the control unit 33 is stopped, the operation signal output to the control unit abnormality determination circuit 43 of the abnormality signal output circuit 21 (a pulse signal that alternately outputs an H level signal and an L level signal at predetermined intervals) Is stopped, and only one of the H level signal and the L level signal is output.

  The control unit abnormality determination circuit 43 determines an abnormality of the control unit 33 when the H level signal and the L level signal are not alternately input from the control unit 33 at predetermined intervals, and the abnormality signal is switched to the switch circuit through the interface circuit 44. Output to 18.

  In the switch circuit 18, when an abnormal signal is input from the abnormal signal output circuit 21, the pair of switches 23 are forcibly turned off by the electric drive means.

  By turning off the pair of switches 23, the space between the secondary side of the rubber-covered insulating transformer 14 and the primary side of the current transformer 19 is completely opened, and no load is applied.

  Further, when the pair of switches 23 are turned off, the power supply to the lighting control circuit 20 and the abnormal signal output circuit 21 is stopped, and the abnormal signal output from the abnormal signal output circuit 21 is not input to the switch circuit 18, but the switch circuit Since 18 is a manual return type switch, it is not turned on unless mechanical operation is performed.

  Then, when the secondary side of the rubber-covered insulated transformer 14 is opened, an overcurrent is generated, which can be detected by the AC constant current control device 13, and the abnormality of the marker lamp 12 can be grasped.

  Thus, according to the marker lamp 12 of the present embodiment, in the marker lamp 12 that controls the lighting of the LED element 17a by the lighting control circuit 20, the AC constant current power input side of the lighting control circuit 20 when an abnormality occurs in the marker lamp 12 By opening the switch to the no-load state, it is possible to determine the abnormality of the marker lamp 12 on the supply side of the AC constant current power source.

  In addition, since the manual return switch is used for the switch circuit 18, the input of the abnormal signal is interrupted after the switch circuit 18 is turned off by the input of the abnormal signal, but the off state can be maintained.

  As mentioned above, although some embodiment of this invention was described, these embodiment is shown as an example and is not intending limiting the range of invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

12 Indicator light
17 Semiconductor light emitting devices
18 Switch circuit
20 Lighting control circuit
21 Abnormal signal output circuit

Claims (2)

A semiconductor light emitting device;
A lighting control circuit for controlling lighting of the semiconductor light emitting element by inputting an AC constant current power supply and monitoring lighting operation;
A switch circuit that is provided on the AC constant current power input side of the lighting control circuit and opens the AC constant current power input side of the lighting control circuit when an abnormal signal is input;
An abnormal signal output circuit for outputting an abnormal signal to the switch circuit by judging the abnormality of the lighting operation in the lighting control circuit;
A sign lamp characterized by comprising: A semiconductor light emitting device;
A lighting control circuit for controlling the lighting of the semiconductor light emitting element by inputting an AC constant current power supply;
A switch circuit that is provided on the AC constant current power input side of the lighting control circuit and opens the AC constant current power input side of the lighting control circuit when an abnormal signal is input;
An abnormal signal output circuit that monitors the operation of the lighting control circuit and outputs an abnormal signal to the switch circuit by abnormality determination;
A sign lamp characterized by comprising:

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