JP2014203517A - Led illuminating device, and lifetime determination method for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an LED illuminating device and a lifetime determination method for the same, capable of determining the arrival of an end of life by a simple configuration.SOLUTION: An LED illuminating device comprises: an AC power supply 1; a rectification circuit 2 for rectifying an AC of the AC power supply 1; a smoothing circuit 3 for smoothing a DC current rectified by the rectification circuit 2; a constant current circuit 4 making a current smoothed by the smoothing circuit 3 to a constant current and then outputting it; an LED 5 driven with the constant current by the constant current circuit 4; a first detector 6 detecting an illuminance of the LED 5; and a control circuit 7 determining the arrival of an end of life in terms of light flux, of the LED illuminating device when the illuminance of the LED 5 detected by the first detector 6 becomes a threshold Lor less.

Description

  The present invention relates to an LED lighting device and a method for determining the life thereof.

  2. Description of the Related Art Conventionally, a technique for determining that the life of a lighting device has come is known. For example, Patent Literature 1 discloses that it is determined that the life has come when the discharge lamp lighting time accumulated in the cumulative counter exceeds the warranty period of the electrolytic capacitor. Patent Document 2 discloses that the life is determined by monitoring the voltage across the electrolytic capacitor in the lighting device with a voltage detection circuit.

JP 2001-185374 A Japanese Patent No. 4736464

  However, according to the prior art, it is necessary to provide a cumulative counter and a voltage detection circuit in order to determine that the lifetime of the lighting device has come, and there is a problem in that the cost is increased and the size is increased.

  An object of the present invention is to provide an LED lighting device capable of determining that a lifetime has come to an end with a simple configuration and a method for determining the lifetime.

  According to one aspect of the present invention, an AC power source, a rectifier circuit that rectifies the AC of the AC power source, a smoothing circuit that smoothes a DC current rectified by the rectifier circuit, and a smoothing circuit smoothed by the smoothing circuit A constant current circuit that outputs a constant current, an LED that is driven by a constant current by the constant current circuit, a first detection unit that detects the illuminance of the LED, and the detection that is detected by the first detection unit There is provided an LED illumination device including a control circuit that determines that the luminous lifetime of the LED illumination device has reached when the illuminance of the LED becomes equal to or less than a threshold value.

  Further, according to another aspect of the present invention, the rectification step for rectifying the alternating current of the AC power supply, the smoothing step for smoothing the rectified direct current, and the smoothed current as a constant current are used to determine the LED. A drive step for current driving; a first detection step for detecting the illuminance of the LED; and a determination step for determining that the luminous lifetime of the LED illumination device has reached when the detected illuminance of the LED is below a threshold value. A method for determining the lifetime of an LED lighting device is provided.

  ADVANTAGE OF THE INVENTION According to this invention, the LED lighting apparatus which can determine that the lifetime came by simple structure, and its lifetime determination method can be provided.

The typical block block diagram of the LED illuminating device which concerns on embodiment. The typical circuit block diagram of the LED lighting apparatus shown by FIG. The flowchart of operation | movement of the LED lighting apparatus which concerns on embodiment. The flowchart of the determination operation | movement of the luminous lifetime of the LED illuminating device which concerns on embodiment. The flowchart of the determination operation | movement of the power supply lifetime of the LED lighting apparatus which concerns on embodiment. The flowchart of another determination operation | movement of the power supply lifetime of the LED lighting apparatus which concerns on embodiment. The typical cross-section figure of the LED illuminating device which concerns on embodiment. It is explanatory drawing of another LED illuminating device which concerns on embodiment, Comprising: (a) Typical plane structure figure, (b) Typical cross-section figure. The typical plane structure figure which expanded the area | region E shown by Fig.8 (a). The device structure figure of the 1st illumination intensity sensor or the 2nd illumination intensity sensor with which the LED lighting device concerning an embodiment is provided. FIG. 11 is an equivalent circuit diagram of the device structure shown in FIG. 10. It is a figure which shows the waveform when the power supply lifetime of the LED lighting apparatus which concerns on embodiment has not come, Comprising: (a) Output waveform of AC power supply, (b) Output waveform of rectifier circuit, (c) Smoothing circuit Output waveform, (d) Optical output waveform of LED for detection. It is a figure which shows the waveform when the power supply lifetime of the LED lighting apparatus which concerns on embodiment has reached, (a) Output waveform of AC power supply, (b) Output waveform of rectifier circuit, (c) Smoothing circuit Output waveform, (d) Optical output waveform of LED for detection.

  Next, embodiments of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic, and the relationship between the thickness of each component and the planar dimensions, the ratio of the thickness of each layer, and the like are different from the actual ones. Therefore, specific thicknesses and dimensions should be determined in consideration of the following description. Moreover, it is a matter of course that portions having different dimensional relationships and ratios are included between the drawings.

  Further, the embodiments described below exemplify apparatuses and methods for embodying the technical idea of the present invention, and the embodiments of the present invention include the material, shape, and structure of each component. The arrangement is not specified below. Various modifications can be made to the embodiment of the present invention within the scope of the claims.

[Embodiment]
Hereinafter, the LED lighting device and its lifetime determination method according to the embodiment will be described in detail.

(LED lighting device)
As shown in FIG. 1, the LED lighting device according to the embodiment smoothes an alternating current power supply (AC power supply) 1, a rectifier circuit 2 that rectifies alternating current of the alternating current power supply 1, and a direct current rectified by the rectifier circuit 2. The smoothing circuit 3 to be converted, the constant current circuit 4 that outputs the current smoothed by the smoothing circuit 3 as a constant current, the LED 5 that is driven by the constant current circuit 4, and the illuminance of the LED 5 1 includes a detection unit 6, when the illuminance of LED5 detected by the first detecting unit 6 is equal to or less than the threshold value L _T, and determining control circuit 7 and the light beam lifespan has been reached in the LED lighting device.

For example, the control circuit 7 may 70% or less of the value of the design light flux value of LED5 as the threshold L _T.

Further, when the control circuit 7 has the dimming function of the LED 5, a value equal to or less than 70% of the dimming value may be set as the threshold value L _T (L _n ).

  The control circuit 7 may determine that the luminous flux life has come only when the dimming value is within a predetermined range (for example, within a range of 100% to 30%).

Further, the control circuit 7 may be compared with the threshold L _T in terms of the averaged by integrating the illuminance of LED 5.

  The first detector 6 may be the first illuminance sensor 6 installed at a predetermined position near the LED 5.

  Moreover, the 1st illumination intensity sensor 6 may be installed inside the nozzle | cap | die with which a straight tube | pipe type LED lamp is provided.

  Moreover, the 1st illumination intensity sensor 6 may be installed on the power supply board with which a ceiling light is provided.

  The detection circuit includes a detection LED whose light output changes in accordance with a change in the capacitance of the electrolytic capacitor included in the smoothing circuit 3, and a second detection unit 8 that detects the light output of the detection LED. When the blinking of the LED exceeds a predetermined level, it may be determined that the power source life of the LED lighting device has come.

  Moreover, the 2nd detection part 8 may be the 2nd illumination intensity sensor 8 installed in the predetermined position near LED for a detection.

  Further, the control circuit 7 may notify that the luminous flux life or the power supply life has come by controlling the pilot lamp.

  Further, the control circuit 7 may notify that the luminous flux life or power supply life has come by reducing the output of the constant current circuit 4.

  Moreover, the control circuit 7 may notify that the luminous flux life or power supply life has come to an end by stopping the output of the constant current circuit 4.

(Circuit configuration example)
A schematic circuit configuration of the LED lighting device shown in FIG. 1 is expressed as shown in FIG. As shown in FIG. 2, the rectifier circuit 2 is connected to the AC power source 1, the smoothing circuit 3 is connected to the rectifier circuit 2, the constant current circuit 4 is connected to the smoothing circuit 3, and the LED 5 is connected to the constant current circuit 4. ing. A DC / DC converter 9 is connected to the smoothing circuit 3, and a control circuit 7 is connected to the DC / DC converter 9. A backup battery 11 and a pilot lamp 12 may be connected to the control circuit 7.

  Here, the first illuminance sensor 6 is installed in the vicinity of the LED 5, and the detection signal of the first illuminance sensor 6 is supplied to the control circuit 7. Thereby, by monitoring the detection signal of the first illuminance sensor 6 in the control circuit 7, it is possible to determine the luminous flux life of the LED lighting device.

  Further, the resistor 8a and the detection LED 8b are connected to the subsequent stage of the smoothing circuit 3. Then, the second illuminance sensor 8 is installed in the vicinity of the detection LED 8 b, and the detection signal of the second illuminance sensor 8 is supplied to the control circuit 7. Thereby, the capacitance change of the electrolytic capacitor provided in the smoothing circuit 3 is converted into light by the detection LED 8b. By receiving the light with the second illuminance sensor 8 and monitoring the detection signal of the second illuminance sensor 8 in the control circuit 7, it is possible to determine the power source life of the LED lighting device.

  Note that an LED lighting device (for example, a ceiling light) that can be equipped with the backup battery 11 can usually be equipped with a counter. In such an LED lighting device, a counter 10 that counts the lighting time may be installed, and the count value may be supplied to the control circuit 7. Thereby, the power supply life of the LED lighting device can be determined by monitoring the count value of the counter 10 in the control circuit 7.

  Here, the first illuminance sensor 6 is illustrated as the first detection unit 6, and the second illuminance sensor 8 is illustrated as the second detection unit 8, but the first detection unit 6 and the second detection unit 8 are illuminance sensors. It is not limited to. For example, a photodiode or the like can be used as the first detection unit 6, and a photodiode or a phototransistor can be used as the second detection unit 8.

(Life judgment method)
The LED lighting device lifetime determination method according to the embodiment includes a rectification step for rectifying an alternating current of an AC power source, a smoothing step for smoothing the rectified direct current, and the smoothed current as a constant current. a drive step of constant current drive, a first detection step for detecting the illuminance of LED5, the illuminance of the detected LED5 is below the threshold value L _T, the determination step determines that the light beam lifespan arrives LED lighting device And have. Moreover, it may have the 2nd detection step which detects the light output of LED8b for detection, and when the blinking of LED8b for detection becomes more than a predetermined level, you may determine with the power supply lifetime of the LED illumination apparatus having come. Hereinafter, such a life determination method will be described in more detail together with the operation of the LED lighting device.

(Operation example)
The operation of the LED lighting device according to the embodiment is expressed as shown in FIG.

  First, when the first illuminance sensor 6 detects the illuminance of the LED 5, the detection signal is supplied to the control circuit 7 (step S1). Thereby, the control circuit 7 determines whether or not the luminous lifetime of the LED illumination device has come based on the detection signal of the first illuminance sensor 6 (step S2).

  On the other hand, when the second illuminance sensor 8 detects the light output of the detection LED 8b, the detection signal is supplied to the control circuit 7 (step 3). Thereby, the control circuit 7 determines whether the power supply lifetime of the LED lighting apparatus has come based on the detection signal of the second illuminance sensor 8 (step S4).

  Thereafter, when the control circuit 7 determines that the luminous lifetime or power supply life of the LED lighting device has come (step S2: YES or step S4: YES), the control circuit 7 notifies the user of that fact (step S5). The notification method is not particularly limited, and various methods can be employed. For example, the pilot lamp 12 may be turned on, or the output of the constant current circuit 4 may be reduced or stopped. Thereby, the user can immediately know that the luminous life or power supply life of the LED lighting device has come.

(Example of operation for determining luminous flux life)
Details of the luminous lifetime determination operation shown in FIG. 3 are expressed as shown in FIG.

First, the control circuit 7 reads the threshold L _T stored in advance in a storage unit not shown (step S11). Usually, an LED has a luminous flux value of about 70% after 40,000 hours (JIS C8152). Therefore, the threshold L _T is desirably to 70% or less of the value of the design light flux value of the LED 5. Moreover, when providing the light control function of LED5, it is desirable to set it as the value of 70% or less of the light control value.

Next, the control circuit 7 calculates a threshold value L _n (L _n = L _T × 100% to L _T × 30%) for the dimming value of 100% to 30% (step S12). The reason for limiting the dimming value of 100% to 30% in the range, at low output is close and the design value with the threshold L _n, because the detection limit is present.

Next, the control circuit 7 activates the first illuminance sensor 6 and confirms the current dimming value (steps S13 → S14). Thereby, the illuminance of the LED 5 is detected by the first illuminance sensor 6 for a certain time, and the detection signal is supplied to the control circuit 7 (step S15). The control circuit 7 calculates the average illuminance L _ave by integrating and averaging the illuminances of the LEDs 5 within a certain time (step S19). The elapse of the fixed time can be determined based on whether or not the count value of a counter (not shown) is equal to or greater than a predetermined count value (steps S16 → S17). When a certain time has elapsed, the counter is reset (step S17: YES → S18).

Next, the control circuit 7 compares the average illuminance L _ave with the threshold value L _n for the current dimming value (step S20). The comparison with the average illuminance L _ave is to avoid the influence of noise included in the detection signal of the first illuminance sensor 6. If the average luminance L _ave is less than the threshold value L _n for the current dimming value (step S20: YES), the light flux lifespan of the LED illumination apparatus to notify the subject that has arrived (step S21).

(Power supply life judgment operation example 1)
The details of the operation for determining the power supply life shown in FIG. 3 are expressed as shown in FIG.

First, the control circuit 7 reads in the threshold value O _T stored in advance in a storage unit (not shown), it activates the second illuminance sensor 8 (step S31 → S32). Thereby, the light output O of the LED 8b for detection is detected by the 2nd illumination intensity sensor 8, and the detection signal is supplied to the control circuit 7 (step S33). Threshold O _T is a value for determining the flickering of the detecting LED8b. That is, when the life of the electrolytic capacitor provided in the smoothing circuit 3 comes, the capacity of the electrolytic capacitor decreases, and the detection LED 8b flickers (described later).

Then, the control circuit 7 compares the light output O with the threshold O _T of the detection LED8b sensed by the second illuminance sensor 8 (step S34). When the light output O of the detection LED8b falls below e.g. threshold O _T (step S34: YES), it is determined that detection LED8b is flashing, the controller generates a notice of a power life of the LED illumination apparatus has arrived (Step S35).

(Power supply life judgment operation example 2)
The power supply life determination operation is not limited to the determination operation shown in FIG. For example, when the counter 10 is mounted on the LED lighting device, a determination operation using the counter 10 is performed instead of the determination operation illustrated in FIG. 5 or in parallel with the determination operation illustrated in FIG. Is desirable. Hereinafter, the determination operation using the counter 10 will be described with reference to FIG.

First, the control circuit 7 reads in the threshold C _T, which is previously stored in the storage unit, not shown, activates the counter 10 (step S41 → S42). The threshold value C _T is a value indicating the power supply life such as 100,000 hours.

Then, the control circuit 7 compares the count value C and the threshold C _T of the counter 10 (step S44). When the count value C of the counter 10 exceeds the threshold value C _T (step S34: YES), the power lifetime of the LED lighting device to notify the subject that has arrived (step S35).

(Installation location 1 of the first illuminance sensor)
A schematic cross-sectional structure of the LED lighting device according to the embodiment is represented as shown in FIG.

  As shown in FIG. 7, the LED illumination device according to the embodiment can be applied to a straight tube type LED lamp. The light diffusion cover 25 is made of a resin such as milky white polycarbonate, and is formed in a cylindrical shape. The light diffusion cover 25 protects the LEDs 5 mounted on the LED substrate 21 and allows light from the LEDs 5 to pass through while diffusing. Bases 23 are attached to both ends in the longitudinal direction of the light diffusion cover 25, and power supply pins 24 that are metal rod-like members protrude from the bases 23. In such a straight tube type LED lamp, a space exists inside the base 23. Therefore, if the 1st illumination intensity sensor 6 is installed inside the nozzle | cap | die 23, space saving can be achieved.

(Installation location 2 of the first illuminance sensor)
A schematic planar structure of another LED lighting apparatus according to the embodiment is represented as shown in FIG. 8A, and a schematic sectional structure thereof is represented as shown in FIG. 8B. Moreover, the schematic planar structure which expanded the area | region E shown by Fig.8 (a) is represented as shown in FIG.

  As shown in FIGS. 8A and 8B, the LED lighting apparatus according to the embodiment can be applied to a ceiling light attached to the surface of the ceiling. Eight LED arrays 32 are provided in a circular shape on the mounting plate 36 in the circular frame 30. In addition, four LED arrays 33 are provided in a rectangular shape inside the LED array 32, and four LED arrays 34 are provided in a rectangular shape inside the LED array 33. A plurality of LEDs 5 are mounted on each LED substrate 31 constituting the LED arrays 32, 33, and 34 along the longitudinal direction thereof. On the circular frame 30, a dome-shaped cover 30a that covers the LED arrays 32, 33, and 34 is attached.

  In such a ceiling light, it is desirable to install the first illuminance sensor 6 on the power supply substrate 35 as shown in FIG. The sensor surface of the first illuminance sensor 6 is installed upward in the drawing. Further, as shown in FIG. 9, a window W is formed in a portion of the mounting plate 36 facing the first illuminance sensor 6, and reflected light from the cover 30a is taken in. As described above, if the first illuminance sensor 6 is installed on the power supply board 35, not only can the space be saved, but it is not necessary to divide the board into separate boards, thereby reducing the possibility of noise being mixed. Is possible. Furthermore, since the power supply board 35 is installed below the LED board 31, the first illuminance sensor 6 does not block the light of the LED 5.

(Illuminance sensor)
The device structure of the first illuminance sensor 6 or the second illuminance sensor 8 included in the LED illumination device according to the embodiment is expressed as shown in FIG. 10, and its equivalent circuit is expressed as shown in FIG. As shown in FIGS. 10 and 11, an illuminance sensor is constituted by a plurality of photodiodes. Specifically, a passivation layer 42 is formed on the photodiode structure 43, and a filter layer 41 is further formed thereon. It has three PN junctions of BL / sub, BL / LI (PW), and NSD / PW, each having different characteristics. The closer to the surface, the easier it is to absorb light with a shorter wavelength. Here, BL / sub is described as photodiode D1, NSD / PW as photodiode D2, and BL / LI as photodiode D3. Of course, the device structure of the 1st illumination intensity sensor 6 or the 2nd illumination intensity sensor 8 is not limited to this, It is possible to change suitably.

(Example of waveform)
A waveform when the power source life of the LED lighting apparatus according to the embodiment has not come is represented as shown in FIG. That is, the output waveform (50 Hz / 60 Hz) of the AC power supply 1 is expressed as shown in FIG. The output waveform (50 Hz / 60 Hz or 100 Hz / 120 Hz) of the rectifier circuit 2 is expressed as shown in FIG. Here, when the power supply life of the LED lighting device has not come, the pulsating component included in the output voltage of the rectifier circuit 2 is smoothed by the electrolytic capacitor provided in the smoothing circuit 3 as shown in FIG. It becomes. For this reason, the light output of the detection LED 8b has a substantially constant value as shown in FIG.

  A waveform when the power source life of the LED lighting device according to the embodiment has come is represented as shown in FIG. The waveforms shown in FIGS. 13A and 13B are the same as those in FIGS. 12A and 12B. Here, when the power supply life of the LED lighting device has come, as shown in FIG. 13C, the pulsating component (50 Hz) included in the output voltage of the rectifier circuit 2 by the electrolytic capacitor provided in the smoothing circuit 3 / 60 Hz, or 100 Hz / 120 Hz) cannot be sufficiently smoothed. Therefore, as shown in FIG. 13D, the light output of the detection LED 8b includes the same pulsating component, and the detection LED 8b blinks. If the second illuminance sensor 8 detects this drop in light output, it is possible to detect that the power life of the LED lighting device has been reached (see step S34 in FIG. 5).

  As described above, according to the present embodiment, it is possible to determine that the lifetime of the LED lighting device has reached with a simple configuration using an illuminance sensor or the like. Therefore, the cost can be reduced and space saving can be achieved.

  In particular, the required illuminance is defined depending on where the LED lighting device is used, such as an expressway, a tunnel, a street light, a hospital, and an office. Therefore, it is important to immediately notify the user that the luminous lifetime has come. Also, LED lighting devices are often used in places where replacement and maintenance are difficult to perform due to the selling point of long life. It is necessary from the viewpoint of safety to determine the power source life of such an LED lighting device. According to the present embodiment, it is possible to determine both the luminous lifetime and the power supply lifetime, and to notify the user immediately when either lifetime has arrived.

  As described above, according to the present invention, it is possible to provide an LED lighting device capable of determining that a lifetime has been reached with a simple configuration and a method for determining the lifetime.

[Other embodiments]
As described above, the present invention has been described according to the embodiment. However, it should be understood that the descriptions and drawings constituting a part of this disclosure are illustrative and do not limit the present invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.

  As described above, the present invention includes various embodiments not described herein.

  The LED lighting device according to the present invention can be applied to various LED lighting devices such as a straight tube type LED lamp and a ceiling light.

DESCRIPTION OF SYMBOLS 1 ... AC power supply 2 ... Rectifier circuit 3 ... Smoothing circuit 4 ... Constant current circuit 5 ... LED
6 ... 1st detection part (1st illumination intensity sensor)
7 ... Control circuit 8 ... 2nd detection part (2nd illumination intensity sensor)
8b ... LED for detection
12 ... Pilot lamp 23 ... Base 35 ... Power supply board

Claims (28)

AC power supply,
A rectifier circuit for rectifying the alternating current of the alternating current power supply;
A smoothing circuit for smoothing the direct current rectified by the rectifier circuit;
A constant current circuit that outputs the current smoothed by the smoothing circuit as a constant current; and
An LED driven by a constant current by the constant current circuit;
A first detector for detecting the illuminance of the LED;
A LED lighting device comprising: a control circuit that determines that the luminous lifetime of the LED lighting device has reached when the illuminance of the LED detected by the first detection unit is less than or equal to a threshold value.   The LED lighting device according to claim 1, wherein the control circuit sets a value equal to or less than 70% of a design light flux value of the LED as the threshold value.   3. The LED lighting device according to claim 2, wherein, when the control circuit has a dimming function of the LED, the threshold value is 70% or less of the dimming value.   The LED lighting device according to claim 3, wherein the control circuit determines that the luminous flux life has come only when the dimming value is within a predetermined range.   5. The LED lighting device according to claim 4, wherein the control circuit determines that the luminous lifetime has come only when the dimming value is within a range of 100% to 30%.   The LED lighting device according to claim 1, wherein the control circuit integrates and averages the illuminance of the LED and compares the average with the threshold value.   The LED illumination device according to claim 1, wherein the first detection unit is a first illuminance sensor installed at a predetermined position in the vicinity of the LED.   The LED lighting device according to claim 7, wherein the first illuminance sensor is installed inside a base included in a straight tube LED lamp.   The LED lighting device according to claim 7, wherein the first illuminance sensor is installed on a power supply board included in a ceiling light. A detection LED whose light output changes according to a change in capacitance of an electrolytic capacitor provided in the smoothing circuit;
A second detector for detecting the light output of the detection LED;
The LED lighting according to any one of claims 1 to 9, wherein the control circuit determines that the power source life of the LED lighting device has come when the blinking of the LED for detection reaches a predetermined level or more. apparatus.   The LED lighting device according to claim 10, wherein the second detection unit is a second illuminance sensor installed at a predetermined position in the vicinity of the detection LED.   The LED lighting apparatus according to claim 1, wherein the control circuit notifies that the lifetime of the luminous flux or the life of the power source has come by controlling a pilot lamp.   The LED according to any one of claims 1 to 11, wherein the control circuit notifies that the lifetime of the luminous flux or the lifetime of the power source has arrived by reducing an output of the constant current circuit. Lighting device.   The LED according to any one of claims 1 to 11, wherein the control circuit notifies that the lifetime of the luminous flux or the life of the power source has come by stopping the output of the constant current circuit. Lighting device. A rectification step for rectifying the alternating current of the alternating current power supply;
A smoothing step for smoothing the rectified direct current;
A driving step of driving the LED at a constant current with the smoothed current as a constant current;
A first detection step of detecting the illuminance of the LED;
A determination step of determining the lifetime of the LED lighting device when the detected luminous intensity of the LED is equal to or less than a threshold value.   16. The method of determining the lifetime of an LED lighting device according to claim 15, wherein a value equal to or less than 70% of a design light flux value of the LED is used as the threshold value.   The LED lighting device life determination method according to claim 16, wherein when the LED has a dimming function, the threshold value is a value of 70% or less of the dimming value.   18. The method of determining a lifetime of an LED lighting device according to claim 17, wherein the lifetime of the luminous flux is determined only when the dimming value is within a predetermined range.   19. The method of determining a lifetime of an LED lighting device according to claim 18, wherein the lifetime of the luminous flux is determined only when the dimming value is within a range of 100% to 30%.   The lifetime determination method of the LED lighting device according to any one of claims 15 to 19, wherein the illuminances of the LEDs are integrated and averaged and compared with the threshold value.   21. The method according to claim 15, wherein the illuminance of the LED is detected by a first illuminance sensor installed at a predetermined position near the LED.   The method of claim 21, wherein the first illuminance sensor is installed inside a base included in a straight tube LED lamp.   The method of claim 21, wherein the first illuminance sensor is installed on a power supply board included in a ceiling light. A second detection step of detecting the light output of the LED for detection in which the light output changes according to a change in capacitance of the electrolytic capacitor provided in the smoothing circuit for smoothing the direct current;
24. The method for determining the life of an LED lighting device according to claim 15, wherein when the blinking of the LED for detection reaches a predetermined level or more, it is determined that the power life of the LED lighting device has come. .   25. The method according to claim 24, wherein a light output of the detection LED is detected by a second illuminance sensor installed at a predetermined position in the vicinity of the detection LED.   26. The method of determining the lifetime of an LED lighting device according to claim 15, wherein the fact that the luminous lifetime or the power source lifetime has been reached is notified by controlling a pilot lamp.   The notification that the lifetime of the luminous flux or the life of the power source has arrived is made by reducing the output of a constant current circuit that drives the LED at a constant current. A method for determining the lifetime of an LED lighting device.   The notification that the lifetime of the luminous flux or the lifetime of the power source has arrived is made by stopping the output of a constant current circuit that drives the LED at a constant current. A method for determining the lifetime of an LED lighting device.

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