JP2012009361A - Led lighting unit inspection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an LED lighting unit inspection device capable of reducing burden by enabling the inspection device to determine whether LED driving outputs of the LED lighting unit are appropriate via evaluation and by making investigation more efficient.SOLUTION: An LED lighting unit inspection device 1 includes evaluation means 6 for dividing LED driving outputs with modulated pulse widths generated by an LED lighting unit 10 into a peak value and a modulated pulse width value and evaluating each value. The evaluation means 6 includes a plurality of determination parts 65 to 61 corresponding to a plurality of brightness ratios.

Description

  Embodiments of the present invention relate to a lighting unit inspection apparatus in an LED type air traffic sign lamp installed at, for example, an airport, an airfield or the like.

  LED type air traffic lights are known as air traffic lights that are installed on runways and taxiways such as airports and airfields. This LED type air traffic sign light uses an LED as a light source, and the LED lighting unit controls the lighting of the LED with a pulse width modulation (PWM) control signal corresponding to the dimming degree.

  This air traffic sign lamp provides visual information necessary for aircraft take-off and landing and ground driving, and plays an important role in supporting the safe operation of aircraft. Therefore, when this LED type air traffic sign lamp is in a malfunctioning state such as non-lighting, it is necessary to investigate which part of the marker lamp is malfunctioning, repair or replace the malfunctioning part, and quickly return as a marker lamp.

JP 2006-139755 A

  However, the LED lighting unit in the LED type air traffic light has a complicated control circuit, and it takes time and labor to investigate whether or not it is malfunctioning, that is, whether it is good or bad. A heavy burden.

  The present invention has been made in view of the above problems, and can be used to evaluate the LED drive output of an LED lighting unit so as to be able to judge whether it is good or bad, and to improve the efficiency of investigation work and reduce the burden. An object is to provide an apparatus.

  The LED lighting unit inspection device of the present invention includes an evaluation unit that evaluates each of the LED driving output of the LED lighting unit that generates a pulse width modulated LED driving output by dividing the LED driving output into a peak value and a pulse width modulation value. It is characterized by doing.

  According to the present invention, since the LED drive output of the LED lighting unit can be evaluated and its quality can be judged, an LED lighting unit inspection device capable of reducing the burden by increasing the efficiency of investigation work is provided. It becomes possible.

It is a top view which shows the operation part of the LED lighting unit test | inspection apparatus which concerns on embodiment of this invention. It is a block block diagram which shows the LED lighting unit test | inspection apparatus. It is a block block diagram which shows an LED lighting unit. It is a wave form diagram which shows LED drive output (PWM output current waveform).

  Hereinafter, an LED lighting unit inspection apparatus according to an embodiment of the present invention will be described with reference to FIGS.

  First, the LED lighting unit 10 which is a premise of the present embodiment will be described with reference to FIGS. 3 and 4. FIG. 3 is a block diagram of the LED lighting unit 10. The LED lighting unit 10 is provided in an LED type air traffic light LG installed on a runway or taxiway such as an airport or an airport. The LED type air traffic sign LG is embedded in a runway or a taxiway, and emits a light beam having a predetermined light distribution.

  A plurality of LEDs 11 are connected to the LED lighting unit 10 as light sources. The LED lighting unit 10 is connected to an AC constant current source CCR through an insulating transformer. The AC constant current source CCR is provided with a dimming tap for switching to an output current corresponding to the luminous intensity ratio, and the luminous intensity ratio is 100% (tap 5, 6.6 A), 25% (tap 4, 5,. 2A), 5% (tap 3, 4.1A), 1% (tap 2, 3.4A), and 0.2% (tap 1, 2.8A), so that the desired stage can be selected. It has become.

  This dimming tap is provided so that the luminous intensity ratio can be switched in accordance with the ambient brightness in order to maintain a good appearance of the marker lamp LG even when the ambient brightness changes.

  A rectifier circuit 12 and a constant voltage circuit 13 are connected to the output terminal of the AC constant current source CCR, and an LED 11 as a load is connected to both ends of the constant voltage circuit 13 via a switching control circuit 14. Further, a determination circuit 15 and a pulse width modulation (PWM) control circuit 16 are connected to the output terminal of the AC constant current source CCR. The pulse width modulation control circuit 16 is connected to the switching control circuit 14.

  In such a configuration, when a predetermined dimming tap is selected by the AC constant current source CCR, the output current is detected and input to the determination circuit 15. The determination circuit 15 determines the light intensity ratio based on the detected current and sends the determination result to the pulse width modulation control circuit 16.

  The pulse width modulation control circuit 16 generates a pulse width modulation control signal based on the input determination result and sends it to the switching control circuit 14. The switching control circuit 14 performs PWM control on the DC output from the constant voltage circuit 13 based on the pulse width modulation control signal sent from the pulse width modulation control circuit 16, and supplies the LED 11 as an LED drive output. As a result, the LED 11 is controlled to be lit at a light intensity according to the light intensity ratio.

  Therefore, the LED drive output from the LED lighting unit 10 is, for example, a PWM output current waveform as shown in FIG. This output current waveform is a pulse waveform, the peak value is constant, and the light control amount (luminous intensity ratio) is determined by the duty ratio. Incidentally, when the dimming tap is large, the duty ratio becomes large.

  Next, FIG.1 and FIG.2 has shown the LED lighting unit test | inspection apparatus 1. FIG. FIG. 1 shows an operation unit 2 of the LED lighting unit inspection device 1, and FIG. 2 shows a block configuration diagram of the LED lighting unit inspection device 1.

  As shown in FIG. 1, the operation unit 2 is provided with a power switch SW, and an operation knob 2 a of a slidac (registered trademark) for adjusting an input current. In addition, a display unit 2b (tap 5 to tap 1) of the selected dimming tap is provided, and a display unit for a determination result based on the crest value determination and the PWM value determination is displayed beside it as the display of the inspection result. 2c is provided. The determination result display section 2c is displayed as “Lo”, “normal”, and “Hi”, respectively. These display units 2b and 2c are both displayed using optical means such as LEDs. For example, “Lo” is blue, “normal” is green, “Hi” In this case, the red light is turned on. Moreover, the display part 2d in which an electric current value is displayed digitally is provided.

  As shown in FIG. 2, the LED lighting unit inspection device 1 includes a variable current source 3, automatic switching means 4, LED drive output detection means 5, and evaluation means 6. As an input power source, a commercial AC power source AC is used, and a variable current source 3 is connected to both ends via a power switch SW. The variable current source 3 includes a Slidac (registered trademark) Sd, a step-down transformer Tr, a digital ammeter Am, and a dummy load Ld.

  A step-down transformer Tr is connected to the output end of Slidac (registered trademark) Sd. One end side of the step-down transformer Tr is connected to the output terminal To via the digital ammeter Am, and the other end side is connected to the other output terminal To via the dummy load Ld.

  An automatic switching unit 4 is connected between the step-down transformer Tr and the dummy load Ld. The automatic switching unit 4 includes an input current detection unit 41, a tap determination unit 42, a tap switching unit 43, and a tap switching switch 44. The tap changeover switch 44 is connected to the input power supply side via the auxiliary power supply transformer Ts and the constant voltage circuit Cv, and switches the dimming taps 5 to 1 to make a plurality of determinations of the evaluation means 6 described later. One of the units 65 to 61 is selected.

  The LED drive output detection means 5 is connected to the input terminal Ti via the pseudo load Lp. The LED drive output detection means 5 receives an LED drive output (see FIG. 5) subjected to PWM control, that is, an LED current signal output through a pseudo load Lp. The LED drive output detection means 5 includes an LED current signal input unit 51 to which an LED current signal output is input, a signal amplification unit 52, a peak value detection unit 53 that detects a peak value of a PWM-controlled signal, and an average value detection unit 54 is provided.

  The peak value detection unit 53 has a peak value detection circuit, and the peak value of the LED drive output is detected by the peak value detection circuit. Moreover, the average value detection part 54 has a level detection circuit, converts an LED drive output into an average value, flattens it, and detects the level by a level detection circuit. In this case, the LED drive output may be converted into an effective value and the level detected by the level detection circuit.

  The evaluation unit 6 includes five determination units 65 to 61 corresponding to the dimming taps 5 to 1, and each determination unit 65 to 61 includes a peak value determination unit 65 a to 61 a and a PWM value determination. Parts 65b to 61b are provided. The evaluation means 6 has a function of dividing the LED drive output into a peak value and an averaged PWM value, evaluating each component, and determining whether it is good or bad.

Each determination unit 65 to 61 has a reference data table for the peak value and the PWM value corresponding to the dimming taps 5 to 1, and the peak value and the PWM value of the LED drive output are the values of the reference data table. It is evaluated by comparing with the value and judged.
In addition, the evaluation result of the LED drive output by the evaluation unit 6, that is, the determination result of each of the determination units 65 to 61 is output to the display unit 2 c of the operation unit 2.
The LED lighting unit 10 to be inspected has an input side connected to the output terminal To of the LED lighting unit inspection device 1 and an output side connected to the input terminal Ti.

  Next, operation | movement of the LED lighting unit test | inspection apparatus 1 comprised as mentioned above is demonstrated. For example, it is assumed that the dimming tap 5 has a luminous intensity ratio of 100%. In this case, the current input to the LED lighting unit 10 is 6.6A.

  First, the LED lighting unit inspection apparatus 1 is turned on. Then, a current of 6.6 A is input to the LED lighting unit 10 by the variable current source 3. Specifically, the operation knob 2a of Slidac (registered trademark) Sd is adjusted to 6.6 A while viewing the display unit 2d of the digital ammeter Am. As a result, a current of 6.6 A corresponding to the dimming tap 5 is input to the LED lighting unit 10.

In this case, this input current is detected by the automatic switching means 4. Specifically, it is detected by the input current detection unit 41, and further, a tap determination unit 42 determines which step of the dimming tap corresponds to. Here, the dimming tap 5 is determined, the determination result is transmitted to the tap switching unit 43, and a selection signal for the tap 5 is transmitted from the tap switching unit 43 to the tap switching switch 44. As a result, the tap changeover switch 44 is connected to the tap 5 and is selected and connected to the determination unit 65 among the determination units 65 to 61 of the evaluation means 6.

  Therefore, the automatic switching unit 4 has a function of automatically determining the dimming tap stage based on the input current and automatically selecting any one of the determination units 65 to 61 corresponding thereto. .

  The PWM-controlled LED drive output input from the LED lighting unit 10 to the LED drive output detection means 5 is amplified by the signal amplification unit 52 and the output is sent to the peak value detection unit 53 and the average value detection unit 54. . The peak value detection unit 53 detects the peak value of the output, and transmits the detection result (A) to the peak value determination unit 65 a of the determination unit 65. On the other hand, the average value detection unit 54 detects the average value of the output and transmits the detection result (B) to the PWM value determination unit 65 b of the determination unit 65.

  In the peak value determination unit 65a and the PWM value determination unit 65b, the peak value and the average value of the output, that is, the PWM value are evaluated by comparing with the values of the reference data table, respectively, and the results (C) and (D) Is displayed on the display unit 2 c of the operation unit 2.

  For example, when the LED lighting unit 10 is in a malfunctioning state, the peak value and the PWM value become excessively small or excessively large. Therefore, such a state can be evaluated by comparing with the value of the reference data table. When the peak value is small, the peak value determination in the operation unit 2 is “Lo”, and when the peak value is large, the peak value determination is “Hi”. These indicate that the state is abnormal, and “normal” is displayed when normal. The same applies to the display of PWM value determination. Such an operation can be executed by using a control device including a CPU and a memory.

  The above operation is the same when the variable current source 3 inputs a current corresponding to the dimming taps 4 to 1 to the LED lighting unit 10. Inspection according to each dimming tap 4-1 can be performed.

  As described above, according to the present embodiment, the LED drive output of the LED lighting unit 10 is evaluated so that the quality can be judged. Therefore, the investigation work can be made efficient and the burden can be reduced. In addition, since both the peak value and the PWM value of the LED drive output subjected to PWM control are evaluated, it is possible to provide the LED lighting unit inspection device 1 having high inspection reliability.

Further, since the automatic switching means 4 automatically determines the dimming tap stage based on the input current and automatically selects the determination units 65 to 61, the inspection work becomes efficient.
In addition, this invention is not limited to the structure of the said embodiment, A various deformation | transformation is possible in the range which does not deviate from the summary of invention.

DESCRIPTION OF SYMBOLS 1 ... LED lighting unit test | inspection apparatus, 2 ... Operation part, 3 ... Variable current source,
4 ... automatic switching means, 6 ... evaluation means, 10 ... LED lighting unit,
65-61 ... determination part

Claims (2)

  An LED lighting unit inspection comprising: an evaluation unit that evaluates each of the LED driving output of the LED lighting unit that generates a pulse width modulated LED driving output by dividing the LED driving output into a peak value and a pulse width modulation value. apparatus. A variable current source capable of outputting a current corresponding to a plurality of luminous intensity ratios;
The evaluation means according to claim 1, comprising a plurality of determination units corresponding to the plurality of luminous intensity ratios;
Automatic switching means for selecting any one of the plurality of determination units corresponding to the output current of the variable current source;
An LED lighting unit inspection device comprising:

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