JP2015197992A - Lighting device and marker lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting device capable of lightening a light-emitting element at a dimming ratio before change to an output current even in a case where an output current of a constant current AC power supply is set to a reduced output current, and to provide a marker lamp comprising the lighting device.SOLUTION: A lighting device 1 comprises: a switching unit 7 that, when a current detection circuit 6 detects an output current of a first predetermined value from an output current smaller than the first predetermined value depending on first table data within a predetermined time period, or when the current detection circuit 6 detects an output current of a second predetermined value from an output current smaller than the second predetermined value depending on second table data, sets any one of the first and second table data depending on the output current of the first predetermined value or the second predetermined value after a lapse of the predetermined time period; and a control circuit 8 that controls a lightning circuit 5 depending on the output current detected by the current detection circuit 6.

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, a plurality of aviation beacon lights are connected in series to the output terminal of a constant current AC power source and are energized. In addition, in order to maintain good visibility of the sign even when the ambient brightness changes, the aviation beacon lamp switches the output current of the constant-current AC power source according to the ambient brightness to achieve a predetermined dimming Controlled to operate at a ratio. That is, a switching tap for output current is provided in the constant current AC power source, and the dimming ratio of the light source can be selected as desired from five levels of 100%, 25%, 5%, 1% and 0.2%. It is configured as follows.

In addition, as for the aviation beacon lamp, switching from an incandescent light bulb to an LED is progressing as a light source. Since the LED-type marker lamp saves power and has a long life, maintenance costs can be greatly reduced. In addition, since various color lights can be obtained according to the type of LED, there is an advantage that a color filter or the like can be eliminated.

However, the light output characteristic with respect to the current of the LED is greatly different from that of the light bulb. That is, the light output of the light bulb changes exponentially with respect to the current, whereas the light output of the LED changes linearly with respect to the current (see, for example, Patent Document 1). For this reason, the LED-type marker lamp is provided with a lighting device that controls the lighting of the LED, and the lighting device is configured so that the LED lights up with the above-described five-stage dimming ratio with respect to the output current of the constant current AC power supply. Is formed. In the current LED-type marker lamp, the dimming ratio of the LED with respect to the output current of the constant current AC power supply is as shown in Table 1 of FIG.

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 bulb-type marker lamps connected to the constant-current AC power supply have been replaced with LED-type marker lights, it has been studied to reduce the output current of the constant-current AC power supply corresponding to the dimming ratio described above. Yes. Due to the decrease in output current, power consumption (wiring loss) due to wiring over several kilometers is reduced.

JP 2008-181781 A (page 2-3, FIG. 2)

  When lighting the LED at the current dimming ratio, when the output current of the constant current AC power supply is reduced, the lighting device lights the LED at the current dimming ratio according to the reduced output current. Need to be formed. In other words, there is a problem that the LED type marker lamp needs a replacement of a lighting device or a new LED type marker lamp.

Embodiments of the present invention provide a lighting device capable of lighting a light emitting element at a dimming ratio before change with respect to the output current even when the output current of the constant current AC power supply is reduced, and the lighting device It aims at providing the sign lamp provided with.

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

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

The switching unit shows a correspondence relationship between the output current of the constant current AC power supply and the dimming ratio of the light emitting element, and a first table in which the output current of the constant current AC power supply corresponding to all light is a first predetermined value. A second relationship between the data, the output current of the constant current AC power supply and the dimming ratio of the light emitting element is shown, and the output current of the constant current AC power supply corresponding to at least all light is smaller than the first predetermined value. It has 2nd table data which is a predetermined value. When the current detection circuit detects an output current having a first predetermined value from an output current smaller than the first predetermined value corresponding to the first table data within a predetermined time, or according to the second table data When an output current having a second predetermined value is detected from an output current smaller than the second predetermined value, the first predetermined value or the second predetermined value is output according to the first predetermined value after the elapse of a predetermined time. And the second table data are set.

The control circuit controls the lighting circuit so that the dimming ratio of the light emitting element becomes the dimming ratio corresponding to the first or second table data set by the switching unit according to the output current detected by the current detection circuit. To be formed.

According to the lighting device of the present embodiment, the switching unit detects the output current having the first predetermined value from the output current smaller than the first predetermined value corresponding to the first table data by the current detection circuit within the predetermined time. Or when an output current having a second predetermined value is detected from an output current smaller than a second predetermined value corresponding to the second table data, the first predetermined value or the first Since either one of the first and second table data is set according to the output current having a predetermined value of 2, when the output current of the constant current AC power supply is set to the reduced output current, the set output current On the other hand, it can be expected that the light emitting element can be turned on without changing the dimming ratio of the light emitting element.

It is a schematic circuit diagram of the lighting device showing an embodiment of the present invention. It is explanatory drawing which shows the 1st and 2nd table data same as the above.

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

The lighting device 1 of the present embodiment controls, for example, the LED 3 as a light emitting element disposed in a lamp body 2 installed in a taxiway at an airfield, and is a constant current power source 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 device 4. The lighting device 1 includes a lighting circuit 5, a current detection circuit 6, a gain switching circuit 7 as a switching unit, 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 gain switching circuit 7 stores and sets the association of the dimming ratio of the LED 3 with the output current of the constant current power supply device 4 and adjusts the output current according to the output current detected by the current detection circuit 6. It is formed so as to set the light ratio. Further, the control circuit 8 controls the lighting circuit 5 so that a current corresponding to the dimming ratio set by the gain switching circuit 7 flows through the LED 3, and a constant current according to the dimming ratio flows through the LED 3. It is configured to perform feedback control.

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 a maximum output current (6.6 A) from a low level output current (2.8 A) by switching taps (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 currents of 2.8A, 3.4A, 4.1A, 5.2A, 6.6A are sequentially output. is there. 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.

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 level determination circuit 21 determines the output current value output from the constant current power supply device 4 based on the detection result of the current detection circuit 6. Is done. The gain switching circuit 7 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. 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 gain switching circuit 7 is first table data indicating the correspondence (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. Have and remember. The gain switching circuit 7 is configured to set the dimming ratio from the correspondence of Table 1 to the output current value detected by the current detection circuit 6 and determined by the level determination circuit 21. The correspondence between the output current and the dimming ratio shown in Table 1 is set for the bulb-type 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. . The output current 6.6A at the tap 5 is the first predetermined value of the present embodiment, 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 gain switching circuit 7 is configured such that 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. It has 2nd table data which shows matching (correspondence relationship), and has memorize | stored it. The second table data is provided corresponding to the reduction of the output current at the tap from the constant current power supply device 4 after all the bulb-type marker lamps are replaced with the LED-type marker lamps. The dimming ratio of the LED 3 in the tap of the constant current power supply 4 is not changed and is the same as the first table data. The output current 5.0A at the tap 5 is the second predetermined value of the present embodiment, and is an output current corresponding to the total light (100%) of the LED 3.

When the lighting device 1 outputs an output current of 3.0 A, 3.5 A, 4.0 A, 4.5 A, or 5.0 A from the constant current power supply device 4, the gain switching circuit 7 performs dimming on the output current. After the ratio is set, the LED 3 is formed to be lit at the set dimming ratio. Then, the gain switching circuit 7 switches and sets either the table data shown in Table 1 or the table data shown in Table 2 with respect to the change of the output current at the tap of the constant current power supply device 4, and the set table The dimming ratio with respect to the output current of the constant current power supply device 4 is set based on the data.

Then, while the gain switching circuit 7 switches and sets the first and second table data, the constant current power supply device 4 responds to the first and second table data within a predetermined time, for example, 30 seconds. The maximum output current (first or second predetermined value) of the tap 5 is sequentially output from the low level output current, and is detected by the current detection circuit 6. The gain switching circuit 7 is configured to set either the first table data or the second table data according to the maximum output current detected by the current detection circuit 6 after a predetermined time has elapsed. ing. That is, when the maximum output current is the second predetermined value of 5.0 A, the table data of Table 2 is set, and when it is 6.6 A of the first predetermined value, the table data of Table 1 is set. The output current at the tap of the constant current power supply device 4 of the second table data is a provisional value shown as an example.

Then, after changing from the first table data to the second table data, confirmation of the change may be required. In order to confirm this change, the maximum output current (6.6 A) (first predetermined value) in the table data of Table 1 is output from the constant current power supply device 4. When the current detection circuit 6 detects the maximum output current (6.6 A), the gain switching circuit 7 is, for example, a low dimming ratio of 5%, a dimming ratio of 1%, and a dimming ratio of 0.2%. The dimming ratio of the level or the dimming ratio is set to 0%. The control circuit 8 turns on the lighting circuit 5 so that the LED 3 is lit at an output current smaller than the first predetermined value, that is, the LED 3 is lit at a low level dimming ratio, or the LED 3 is turned off. To control. By visually confirming that the LED 3 is turned on or off at a low dimming ratio, the change (switching) to the second table data is confirmed.

The control circuit 8 includes a level determination circuit 21, a gain switching circuit 7, a pulse circuit 22, a pulse conversion circuit 18, a feedback control circuit 19, and the like, and the dimming ratio of the LED 3 is set by the gain switching circuit 7. The lighting circuit 5 is controlled so as to have a dimming ratio, and the load adjusting 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.

Next, the operation of this embodiment will be described.

For example, in the case of an aeronautical beacon lamp, after all the bulb-type beacon lights are replaced with LED-type beacon lights, the constant current power supply device 4 and the beacon light 23 are connected with a constant lamp in order to reduce the power consumption (wiring loss). Changing the output current at the taps 1 to 5 of the current power supply device 4 to a reduced output current has been studied. Here, when the current first table data shown in Table 1 is changed to, for example, the second table data shown in Table 2, the gain switching circuit 7 performs the first change with respect to the output current of the constant current power supply device 4. If the dimming ratio of the LED 3 is set based on the table data, 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 changes from the current first table data to, for example, 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. (Switch) to set.

First, the taps 1 to 5 of the constant current power supply 4 are sequentially switched within a predetermined time, for example, 30 seconds, and the second table-data from the low level output current corresponding to the output current of 3.0A to 5.0A. The maximum output current (5.0 A) that is the second predetermined value is output. Here, the taps 1 to 5 of the constant current power supply device 4 may be sequentially switched to five stages of taps 1, 2, 3, 4 and 5; It may be switched sequentially to the three stages.

The output current of the constant current power supply device 4 is detected by the current detection circuit 6, and the output current value is determined by the level determination circuit 21. The gain switching circuit 7 switches and sets the first table data to the second table data when the output current value after the elapse of the predetermined time is the second predetermined value 5.0A. Thereafter, the gain switching circuit 7 adjusts the dimming ratio of the LED 3 based on the correspondence between the output current of the second table data and the dimming ratio with respect to the output current of the constant current power supply device 4 detected by the current detection circuit 6. Set.

The first table data by the gain switching circuit 7 is generated by sequentially switching the taps 1 to 5 of the constant current power supply device 4 within a predetermined time to output the maximum output current (5.0 A) which is the second predetermined value. To the second table data can be accurately performed. In other words, if only the maximum output current (5.0 A) is output from the constant current power supply device 4 and the determination is made, the maximum output current (5.0 A) is set to 5 at the tap 4 of the first table data. Since it is substantially equivalent to the output current of 2A, the gain switching circuit 7 becomes unstable in determining whether or not the output current has been changed in the taps 1 to 5 of the constant current power supply device 4.

Thus, the gain switching circuit 7 can easily switch and set the first table data to the second table data by the output current output stepwise from the constant current power supply device 4. In order to confirm this switching, the maximum current (6.6 A) that is the second predetermined value of the first table data is output from the constant current power supply device 4. The gain switching circuit 7 sets the dimming ratio to a low level dimming ratio, for example, 5% or the dimming ratio 0% according to the output current of 6 and 6A. Under the control of the lighting circuit 5 by the control circuit 8, the LED 3 of the marker lamp 23 is turned on or turned off at a low level dimming ratio. By visually confirming this lighting state, switching from the first table data to the second table data is confirmed.

When the second table data is changed to the first table data and set, the taps 1 to 5 of the constant current power supply device 4 are sequentially switched within a predetermined time, for example, 30 seconds, so that the first table data The maximum output current (6.6 A) which is the first predetermined value is output from the low level output current corresponding to the output current of 2.8 A to 6.6 A. Hereinafter, it is set in the same manner as described above.

According to the lighting device 1 of the present embodiment, the gain switching circuit 4 causes the current detection circuit 6 to sequentially detect the maximum output current from the low level output current corresponding to the first or second table data within a predetermined time. In this case, since either the first table data or the second table data is set according to the maximum output current after a lapse of a predetermined time, the output current at the tap of the constant current power supply device 4 is set to be reduced. In this case, the first or second table data can be easily set, and the LED 3 can be turned on without changing the dimming ratio of the LED 3 with respect to the set output current.

Further, after the gain switching circuit 7 sets the second table data, the constant current power supply device 4 outputs the maximum output current (first predetermined value) of the first table data, and the current detection circuit 6 By detecting the output current, the control circuit 8 controls the lighting circuit 5 so that the LED 3 is turned on at a low level dimming ratio or the LED 3 is turned off, so that the lighting state of the LED 3 is visually recognized. By doing so, there is an effect that switching from the first table data to the second table data can be easily confirmed.

Further, even if the output light of the constant current power supply device 4 as a constant current AC power supply is changed to an output current that is lower than the current value, the indicator lamp 23 changes the LED 3 to a dimming ratio before the change with respect to the output current. Since the lighting device 1 that can be turned on is provided, there is an effect that it is not necessary to replace with a new marker lamp.

The embodiment described above is presented as an example, and is 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 light emitting element, 5 ... Lighting circuit, 6 ... Current detection circuit, 7 ... Gain switching circuit as a switching part, 8 ... Control circuit, 23 ... Indicator light

Claims (3)

A lighting circuit that inputs an output current of a constant current AC power source and outputs a current corresponding to a dimming ratio of the light emitting element to the light emitting element; a current detection circuit that detects the output current of the constant current AC power source; and a constant current AC A first table data indicating a correspondence relationship between the output current of the power source and the dimming ratio of the light emitting element, and the output current of the constant current AC power source corresponding to all light having a first predetermined value; A correspondence between the output current of the alternating current power supply and the dimming ratio of the light emitting element is shown, and the second predetermined current in which the output current of the constant current alternating current power supply corresponding to at least all light is smaller than the first predetermined value. Second table data that is a value, and the current detection circuit outputs an output current of the first predetermined value from an output current that is smaller than the first predetermined value corresponding to the first table data within a predetermined time. Is detected, or When an output current having the second predetermined value is detected from an output current smaller than the second predetermined value corresponding to the second table data, the first predetermined value or the first A switching unit that sets one of the first and second table data according to an output current of a predetermined value of 2; and a dimming ratio of a light emitting element according to the output current detected by the current detection circuit And a control circuit for controlling the lighting circuit so as to have a dimming ratio corresponding to the first or second table data set in the unit. When the current detection circuit detects the output current of the first predetermined value of the first table data after the switching unit sets the second table data, the control circuit has the light emitting element as the first table data. 2. The lighting device according to claim 1, wherein the lighting circuit is controlled so as to be lit at an output current smaller than a predetermined value or to be turned off. An indicator lamp comprising: the lighting device according to claim 1; a light emitting element controlled to be turned on by the lighting device; and a lamp body provided with at least the light emitting element.

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