JP2016207512A - Lighting device and marker lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting device capable of recognizing a switching signal of an output current pattern outputted from a constant current AC power supply with a good accuracy, at switching of table data, and to provide a marker lamp comprising the lighting device.SOLUTION: A lighting device 1 comprises: a lighting circuit 5; a current detection circuit 6; a switching circuit 7 that determines each output current of combination pattern data over a determination time period shorter than an output time period in which the output current is outputted, and starts determination to the next output current from a termination time point of the determination time period, and when an output current pattern outputted from a constant current AC power supply 4 is accorded with the combination pattern data, sets one of a plurality of pieces of table data depending on the combination pattern data; and a control circuit 8 that controls the lighting circuit 5 so that a dimming ratio of a light source 3 becomes a dimming ratio corresponding to the table data set at the switching circuit 7 depending on the output current detected by the current detection circuit 6.SELECTED DRAWING: Figure 1

Description

Embodiments described herein relate generally to a lighting device that performs dimming control of a light source according to an output current of an AC power supply, and a marker lamp that includes the lighting device.

For example, an aircraft beacon lamp has five levels of 100%, 25%, 5%, 1%, and 0.2% according to the output current output by switching the switching taps 1 to 5 of the constant current AC power source. The dimming ratio can be controlled. And the aviation beacon lamp has low power consumption and a long life as a light source, and an LED type beacon lamp using an LED capable of obtaining various colored lights is replaced with an existing incandescent beacon lamp.

However, at the airport, existing incandescent beacon lights are sequentially replaced with LED beacon lights. For this reason, incandescent type indicator lights and LED type indicator lights are mixed on the same runway or the like until all the replacements are completed. Currently, the correspondence between the output current of the constant current AC power source and the dimming ratio of the light source is as shown in the table data of Table 1 in FIG. The LED marker lamp has a light output characteristic with respect to the current of the LED that is significantly different from that of the incandescent lamp.

By the way, the aviation beacon lamps are connected in series with a wiring length of several km from the constant current AC power source. Then, after all the incandescent marker lamps connected to the constant current AC power source are replaced with the LED type marker lamps, the output current of the constant current AC power source corresponding to the above dimming ratio is, for example, as shown in Table 2 of FIG. Reduction as shown in the table data is being studied. Due to the decrease in output current, power consumption (wiring loss) due to wiring over several kilometers is reduced.

And the LED type | mold marker lamp is provided with both table data shown, for example in Table 1 and Table 2 of FIG. 2, and can respond to switching of the output current of a constant current alternating current power supply. For example, the constant current AC power supply outputs a switching signal for switching the table data, and the LED type indicator lamp is configured to switch the table data by detecting the switching signal input through the power supply line. There are some (for example, refer to Patent Document 1). Here, for example, a pattern obtained by sequentially switching to the current values of the switching taps 1 to 5 within a predetermined period set in advance can be used as the switching signal.

Japanese Unexamined Patent Publication No. 2014-60128 (5th page, FIGS. 1 and 2)

  The power line of the constant current AC power supply has a large wiring length, and connects a large number of LED type marker lamps. The output current of the constant current AC power supply takes some time to stabilize after switching the switching tap. Thereby, if the switching signal of the pattern due to the sequential switching of the switching tap of the constant current AC power supply is unstable or short, depending on the LED type marker lamp, the pattern of the switching signal cannot be detected, There is a possibility that the switching signal cannot be recognized.

An object of an embodiment of the present invention is to provide a lighting device capable of accurately recognizing a switching signal of an output current pattern output from a constant current AC power source in switching table data, and a marker lamp including the lighting device. To do.

The lighting device of the present embodiment includes a lighting circuit, a current detection circuit, a switching circuit, and a control circuit.

The lighting circuit is configured to input an output current from the constant current AC power source and output a current corresponding to the dimming ratio of the light source to the light source. The current detection circuit detects an output current of the constant current AC power source.

The switching circuit has a plurality of table data indicating a correspondence relationship between output currents of different constant current AC power supplies and dimming ratios of light sources, and combination pattern data of output currents of the constant current AC power supplies. Then, each output current of the combination pattern data is determined over a determination period that is shorter than the output period in which the output current is output, and determination on the next output current is started from the end of the determination period. recognize. The switching circuit sets one of the plurality of table data according to the combination pattern data when the output current pattern output from the constant current AC power source matches the combination pattern data.

The control circuit controls the lighting circuit so that the dimming ratio of the light source becomes the dimming ratio corresponding to the table data set by the switching circuit according to the output current detected by the current detection circuit.

According to the lighting device of the present embodiment, the switching circuit determines each output current of the combination pattern data over a determination period that is shorter than the output period of the output current, and the next output current from the end of the determination period. Therefore, the output period of the output current output from the constant current AC power supply and the determination period for determining the output current are easily synchronized, and thereby the output current pattern output from the constant current AC power supply On the other hand, it can be expected that the combination pattern data can be accurately recognized.

It is a schematic circuit diagram of the lighting device which shows one Embodiment of this invention. It is explanatory drawing which shows different table data from the above. FIG. 4 is a timing chart showing determination of combination pattern data for an output current pattern.

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

The lighting device 1 according to the present embodiment controls, for example, the LED 3 as a light source provided in a lamp body 2 installed in a taxiway at an airport, and the constant current power supply device 4 as a constant current AC power source. The dimming ratio of the LED 3 is varied according to the constant current output current output from the LED 3. The lighting device 1 includes a lighting circuit 5, a current detection circuit 6, a switching circuit 7, and a control circuit 8.

The lighting circuit 5 is formed to adjust the output current of the constant current power supply device 4 so that a current corresponding to the dimming ratio of the LED 3 flows to the LED 3. The current detection circuit 6 is formed to detect the output current of the constant current power supply device 4 that is input to the lighting device 1. The switching circuit 7 stores the correspondence relationship of the dimming ratio of the LED 3 with respect to the output current of the constant current power supply device 4 as a plurality of table data, and a plurality of tables according to the combination pattern data of the output current detected by the current detection circuit 6. It is configured to set one of the data. Further, the control circuit 8 controls the lighting circuit 5 so that the dimming ratio of the LED 3 becomes the dimming ratio corresponding to the table data set by the switching circuit 7 according to the output current detected by the current detection circuit 6. It is formed to do.

A plurality of rubber-covered insulated transformers 9 (only one is shown in FIG. 1) connected in series are connected to the output terminal of the constant current power supply device 4. The constant current power supply 4 outputs the maximum output current (6.6 A) from the low level output current (2.8 A) by switching the taps 1 to 5 (not shown). That is, as shown in Table 1 of FIG. 2, when the tap 1 is sequentially switched to the tap 5, the output current of 2.8A, 3.4A, 4.1A, 5.2A and the rated current of 6.6A is sequentially applied. Output. The rubber-covered insulated transformer 9 is used to reduce the output current of the constant current power supply device 4 at a current ratio of 10 to 1, for example. The output current reduced by the rubber-coated insulating transformer 9 is input to the lighting device 1. The output terminal of the rubber-coated insulating transformer 9 is connected between the primary side of the rectifier circuit 10 connected in series, the primary winding of the current transformer 11 and the primary winding of the current transformer 12, and a constant current power source The output current of the device 4 flows through the rectifier circuit 10, the current transformer 11, and the current transformer 12, respectively.

The output current input to the rectifier circuit 10 is full-wave rectified by the rectifier circuit 10, the rectified value is adjusted by the load adjustment circuit 13, smoothed to a constant value by the smoothing circuit 14, and input (supply) to the lighting circuit 5. Is done. The lighting circuit 5 adjusts the input current so as to be a current corresponding to the dimming ratio of the LED 3 and outputs the adjusted current to the LED 3.

The output current input to the current transformer 11 is full-wave rectified by the rectifier circuit 15, the rectified value is adjusted by the load adjustment circuit 16, smoothed to a constant value by the smoothing circuit 17, and supplied to the pulse conversion circuit 18 as a drive power supply. Input (supplied). The pulse conversion circuit 18 inputs a current value flowing through the LED 3 detected by the lighting current detection circuit 19 from the feedback control circuit 19. Further, the voltage value applied to the LED 3 is input from the voltage detection circuit 20. Based on the input current value and voltage value, the load adjustment circuit 13 is controlled to adjust the rectified value of the rectifier circuit 10 so that a constant current corresponding to the dimming ratio flows through the LED 3. Yes.

The output current input to the current transformer 12 is detected by the current detection circuit 6, and the output current value is determined by the level determination circuit 21. The switching circuit 7 selects and sets the dimming ratio of the LED 3 according to the output current value determined by the level determination circuit 21, and outputs the set value of the dimming ratio to the pulse circuit 22. The pulse circuit 22 outputs a pulse signal corresponding to the dimming ratio of the set value to the lighting circuit 5. Then, the lighting circuit 5 adjusts, for example, a conduction period of the input current according to the pulse signal, and controls the LED 3 to flow a current according to the dimming ratio.

As shown in Table 1 of FIG. 2, the switching circuit 7 has and stores table data indicating the correspondence between the output current at the taps 1 to 5 of the constant current power supply device 4 and the dimming ratio of the LED 3. . Hereinafter, the table data in Table 1 is referred to as first table data. The correspondence relationship between the output current and the dimming ratio shown in the first table data is set for the incandescent marker lamp, and the lighting device 1 is formed so that the LED 3 can be lit at the dimming ratio with respect to the output current. Has been. The output current 6.6A at the tap 5 is a rated current in the first table data, and is an output current corresponding to the total light (100%) of the LED 3.

Further, as shown in Table 2 of FIG. 2, the switching circuit 7 corresponds to the correspondence between the output current set lower than the first table data in the taps 1 to 5 of the constant current power supply device 4 and the dimming ratio of the LED 3. Table data indicating the relationship is stored. Hereinafter, the table data in Table 2 is referred to as second table data. The 2nd table data is provided corresponding to reducing the output current in taps 1-5 from constant current power unit 4 after all incandescent marker lamps are replaced with LED marker lamps. The dimming ratio of the LED 3 in the taps 1 to 5 of the constant current power supply device 4 is not changed and is the same as the first table data. The output current 5.0A at the tap 5 is a rated current in the second table data, and is an output current corresponding to the total light (100%) of the LED 3. Thus, the switching circuit 7 has different first and second table data in this embodiment.

Further, the switching circuit 7 has and stores combination pattern data of the output current output from the constant current power supply device 4 as shown in FIG. 3A, for example. The combination pattern data is based on continuous switching of the taps 1 to 5. In this embodiment, the combination pattern data is output from the constant current power supply device 4 a predetermined number of times, for example, 10 times, for example, 2.8 A for every output period T1. , 4.1 A, 3.4 A, 5.2 A, 3.4 A,..., 3.4 A, 6.6 A, 2.8 A. The output period T1 can be 10 seconds, for example.

Then, the switching circuit 7 determines each output current of the combination pattern data over a determination period T2 of a period shorter than the output period T1, and determines the next output current of the combination pattern data from the end point of the determination period T2. Is started, the output current is recognized, and it is determined whether or not the output current pattern output from the constant current power supply device 4 matches (matches) the combination pattern data. When the output current pattern output from the constant current power supply device 4 matches the combination pattern data, one of the first and second table data is set.

In the present embodiment, the combination pattern data of the output current is composed of one of the above-mentioned ones, and the switching circuit 7 outputs the first and the second each time the output current pattern output from the constant current power supply device 4 matches the combination pattern data. One of the second table data is sequentially set. That is, every time the output current pattern matches the combination pattern data, the first table data is set to the second table data, or the second table data is set to the first table data.

The control circuit 8 includes a level determination circuit 21, a switching circuit 7, a pulse circuit 22, a pulse conversion circuit 18, a feedback control circuit 19, and the like. The control circuit 8 then adjusts the dimming ratio of the LED 3 to the dimming ratio corresponding to the first or second table data set by the switching circuit 7 in accordance with the output current detected by the current detection circuit 6. In addition to controlling the lighting circuit 5, the load adjustment circuit 13 is controlled so that a constant current corresponding to the dimming ratio flows through the LED 3.

The LED 3 whose lighting is controlled by the lighting device 1 is arranged in the lamp body 2. In the present embodiment, a marker lamp 23 is constituted by a plurality of lamps 2. The LEDs 3 of the lamp body 2 are connected in series across the lamp bodies 2 and are connected to the lighting device 1. The LED 3 of each lamp body 2 is lit by an equivalent constant current.

Further, the constant current power supply device 4 outputs an output current for dimming and lighting the LED 3 of the lamp body 2 according to a command from the main control device 24, and also serves as a switching signal for switching between the first and second table data. Output the output current pattern.

Next, the operation of this embodiment will be described.

When a lighting command for dimming and lighting the LED 3 of the lamp body 2 is output from the main control device 24, an output current corresponding to the lighting command is output from the constant current power supply device 4. The output current flows to the rectifier circuit 10, the current transformer 11, and the current transformer 12 of the lighting device 1 through the rubber-coated insulating transformer 9. The current detection circuit 6 detects the output current output from the constant current power supply device 4 from the current flowing through the current transformer 12. The output current is determined by the level determination circuit 21 and input to the switching circuit 7.

The switching circuit 7 selects and sets the dimming ratio of the LED 3 according to the current value of the output current from the first table data, and outputs the set value of the dimming ratio to the pulse circuit 22. The pulse circuit 22 outputs a pulse signal corresponding to the dimming ratio of the set value to the lighting circuit 5. The lighting circuit 5 outputs a current corresponding to the dimming ratio of the LED 3 to the LED 3 according to the pulse signal. The LED 3 is lit at a set dimming ratio, and emits visible light of a predetermined color. Thus, the lighting device 1 controls the lighting of the LED 3 in accordance with the output current output from the constant current power supply device 4.

And since the lighting device 1 and LED3 are loads with respect to the constant current power supply device 4, when the current value of the output current output from the constant current power supply device 4 is changed by switching the taps 1 to 5, At the input of the lighting device 1, it takes some time to stabilize.

Then, after all the incandescent beacon lamps are replaced with the LED beacon lights, the aviation beacon lamps reduce the power consumption (wiring loss) of the wiring connecting the constant current power supply device 4, the lighting device 1 and the beacon light 23 In order to reduce the output current, the output current at the taps 1 to 5 of the constant current power supply 4 is changed to a reduced output current. Here, when the output current at the taps 1 to 5 of the constant current power supply device 4 is changed, the switching circuit 7 adjusts the dimming of the LED 3 based on the first table data with respect to the output current of the constant current power supply device 4. When the ratio is set, the dimming ratio according to the output current of the constant current power supply device 4 cannot be set. For example, for the output current of 4.5 A at the tap 4 of the constant current power supply device 4, the dimming ratio must be set to 25%, but the dimming ratio of the first table data is set to 5%. End up. Further, although the dimming ratio must be set to 100% with respect to the output current of 5.0 A at the tap 5, the dimming ratio of the first table data is set to 25%. Therefore, the lighting device 1 switches from the current first table data to the second table data when the output current at the taps 1 to 5 of the constant current power supply device 4 is changed to the reduced output current. Set.

Main controller 24 switches from the first table data to the second table data in lighting device 1 when the output current at taps 1-5 of constant current power supply device 4 is changed to the reduced output current. A switching command is output to the constant current power supply device 4. The constant current power supply device 4 sequentially switches the taps 1 to 5 every output period T1 (for example, 10 seconds) so that the output current pattern shown in FIG. Thereby, for example, 2.8 A, 4.1 A, 3.4 A, 5.2 A, 3.4 A,..., 3.4 A, 6.6 A, 2.8 A are output from the constant current power supply device 4. .

The output current output from the constant current power supply device 4 is detected by the current detection circuit 6 in the lighting device 1, and the output current value is determined by the level determination circuit 21 and input to the switching circuit 7. The switching circuit 7 determines over the determination period T2 whether or not the input output current value matches the combination pattern data of the output current. Here, the determination period T2 is a period during which the output current output from the constant current power supply device 4 is stably input to the lighting device 1, and is shorter than the output current output period T2 (for example, 10 seconds). For example, it is set to 8 seconds. Then, by determining the output current value over the determination period T2, the output current due to malfunction or the like is eliminated, and the reliability of whether or not the output current is the combination pattern data is improved.

When the switching circuit 7 recognizes that the input output current value is the first current value (2.8 A) of the combination pattern data of the output current, as shown in FIG. 3B, from the end of the determination period T1. The next current value (4.1 A) of the combination pattern data is set as the comparison current value, and the process waits until the current value of the output current output from the constant current power supply device 4 is input. When the switching circuit 7 determines that the input output current value is not the first current value (2.8 A) of the output current combination pattern data, the output current from the constant current power supply device 4 forms the combination pattern data. Assuming that no new output current value is input, the process waits.

When the output current value of the constant current power supply device 4 is input, the switching circuit 7 determines whether or not the output current value matches the comparison current value (4.1 A). When the output current value and the comparison current value (4.1A) match, the output current value (4.1A) is recognized, and the next current value (3.4A) of the combination pattern data from the end of the determination period T1. ) As a comparison current value, and waits until the current value of the output current output from the constant current power supply device 4 is input. If it is determined that the output current value and the comparison current value (4.1 A) do not match, it is determined that the output current from the constant current power supply device 4 does not match the combination pattern data at this time, and a new output current value is awaited. To do.

Hereinafter, the switching circuit 7 sequentially outputs the current values 3.4A, 5.2A, 3.4A,..., 3.4A, 6.6A, 2.8A of the combination pattern data. It is determined whether or not the output current value matches the output current value. If the output current value does not match, the output current from the constant current power supply 4 does not match the combination pattern data at this time.

Thus, when comparing the output current value of the constant current power supply device 4 and the current value of the combination pattern data, the switching circuit 7 recognizes the combination pattern data from the end of the determination period T1 after the recognition of the output current value. It waits for the next current value and waits for the input of the output current value of the constant current power supply device 4. Therefore, the output current value and the current value of the combination pattern data can be compared with the output of the output current of the constant current power supply device 4. That is, the output current output period T1 of the constant current power supply device 4 and the determination period T2 for stably comparing the output current value and the current value of the combination pattern data are synchronized. Thereby, the comparison control in the switching circuit 7 can be performed easily and accurately, and the accuracy of recognizing the output current value as combination pattern data is improved.

When the switching circuit 7 determines that the output current pattern output from the constant current power supply device 4 matches the combination pattern data, the switching circuit 7 switches and sets the first table data to the second table data. Based on the table data, the dimming ratio of the LED 3 is selected and set.

When the second table data is set in the switching circuit 7, the constant current power supply device 4 switches 2.8 A to 5.0 A (rated) as shown in Table 2 in FIG. Current). The switching circuit 7 selects and sets the dimming ratio from the second table data according to the input output current value. The lighting circuit 19 outputs a current corresponding to the dimming ratio to the LED 3 to light the LED 3.

According to the lighting device 1 of the present embodiment, the switching circuit 7 is configured to determine each output current of the combination pattern data over a determination period T2 that is shorter than the output period T1 of the output current output from the constant current power supply device 4. Since the determination for the next output current is started at the end of the determination period T2, the output period T1 of the output current output from the constant current AC power supply 4 and the determination period T2 for determining the output current are synchronized. Thus, the output current pattern output from the constant current AC power source 4 and the combination pattern data can be easily and stably compared, and the combination pattern data can be easily and accurately compared with the output current pattern. It has the effect that it can be recognized.

Since the switching circuit 7 sequentially sets one of the plurality of table data each time the output current pattern output from the constant current power supply device 4 matches the combination pattern data, switching for switching the table data is performed. The signal can be minimized and simplified.

Moreover, even if the output light of the constant current power supply device 4 is changed to an output current that is lower than the current value, the indicator lamp 23 can turn on the LED 3 with the dimming ratio before the change with respect to the output current. 1 has the effect that it is not necessary to replace with a new marker lamp.

In this embodiment, the switching circuit 7 uses, for example, one output current combination pattern data shown in FIG. 3A. However, the present invention is not limited to this, and a plurality of output current combination pattern data is used. You may have. Then, the output current of the output current pattern that is one of the plurality of combination pattern data is output from the constant current power supply device 4, and the switching circuit 7 is configured to output the output current pattern that matches any of the plurality of combination pattern data. In addition, the first and second table data may be sequentially switched and set. Further, by associating a plurality of combination pattern data with a plurality of table data, one of the plurality of table data is set according to the combination pattern data matching the output current pattern output from the constant current power supply device 4 May be. In the configuration of the output current pattern and the combination pattern data, the output period T1, the determination period T2, and the predetermined number of output currents may be set as appropriate. The table data may be an arithmetic expression.

The above-described embodiments are presented as examples, and are not intended to limit the scope of the invention. The novel embodiment can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. This embodiment and its modifications are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 ... Lighting device, 2 ... Lamp body, 3 ... LED as a light source, 5 ... Lighting circuit, 6 ... Current detection circuit, 7 ... Switching circuit, 8 ... Control circuit, 23 ... Indicator light

Claims (3)

A lighting circuit for inputting an output current of a constant current AC power source and outputting a current corresponding to a dimming ratio of the light source to the light source; a current detection circuit for detecting the output current of the constant current AC power source; A plurality of table data indicating a correspondence relationship between the output current of the power supply and the dimming ratio of the light source, and combination pattern data of the output current of the constant current AC power supply, and each output current of the combination pattern data is represented by Is determined over a determination period that is shorter than the output period during which the output current is output, and the determination for the next output current is started from the end of the determination period. A switching circuit that sets one of the plurality of table data according to the combination pattern data when matching the combination pattern data; and the current detection A control circuit for controlling the lighting circuit so that the dimming ratio of the light source becomes a dimming ratio corresponding to the table data set by the switching circuit in accordance with the output current detected by the path. A lighting device characterized by. The switching circuit sequentially sets one of the plurality of table data each time an output current pattern output from a constant current AC power source matches the combination pattern data. Lighting device. An indicator lamp comprising: the lighting device according to claim 1; a light source controlled to be turned on by the lighting device; and a lamp body having at least the light source.

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