JP2015023002A - Led drive device and illuminating fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress reduction in illuminance in a case where abnormalities occur in some LED light sources.SOLUTION: A first control circuit 10 stops a first converter 1 by stopping switching of a switching element 11 in a case where a first abnormality detection signal is inputted. A second control circuit 20 stops a second converter 2 by stopping switching of a switching element 21 in a case where a second abnormality detection signal is inputted. Further, the first control circuit 10 increases a power supply amount from the first converter 1 to a first LED light source B1 by increasing a peak value higher than that at a normal time in a case where no first abnormality detection signal is inputted and the second abnormality detection signal is inputted. As a result, because the quantity of light of the first LED light source B1 increases, reduction in illuminance in a case where the second LED light source B2 is extinguished can be suppressed.

Description

  The present invention relates to an LED driving device and a lighting fixture.

  As a conventional example, an LED lighting device described in Patent Document 1 is illustrated. The conventional example described in Patent Document 1 includes a DC / DC converter, a switching control unit, a PWM (Pulse Width Modulation) controller, and an abnormality detection unit. The switching control unit selectively controls the connection between the two LED light sources and the output terminal of the DC / DC converter. The PWM controller increases or decreases the output of the DC / DC converter according to the LED light source connected to the output terminal of the DC / DC converter by the switching control unit. The abnormality detection unit detects an abnormality (such as a short circuit or no load) of the two LED light sources, and stops power supply to the LED light source that has detected the abnormality.

  In the conventional example described in Patent Document 1, it is easy to recognize that an abnormality has occurred in the LED light source by stopping power supply to the LED light source in which an abnormality has occurred and turning it off.

JP 2011-154841 A

  By the way, in the LED driving device that drives a plurality of LED light sources as in the conventional example described in Patent Document 1, when an abnormality occurs in any of the LED light sources, the driving of the LED light source is simply stopped (turned off). Inconvenience may occur. For example, when an LED light source is used as a light source for road lighting or tunnel lighting, it may be difficult to ensure the minimum required illuminance by turning off some of the plurality of LED light sources.

  The present invention has been made in view of the above problems, and an object thereof is to suppress a decrease in illuminance when an abnormality occurs in some LED light sources.

  An LED driving device according to the present invention is an LED driving device that drives a plurality of LED light sources by converting input power into desired DC power and feeding the converted DC power, and detects an abnormality in the LED light source. An abnormality detecting means that adjusts the direct current power supplied to the plurality of LED light sources, and a power supply to the LED light source in which the abnormality detecting means detects an abnormality among the plurality of LED light sources. And a control means for controlling the adjusting means so as to increase the amount of power supplied to the LED light source in which no abnormality is detected by the abnormality detecting means.

  The LED driving device includes an AC / DC conversion unit that converts AC input power into DC power, and the adjustment unit converts the DC power output from the AC / DC conversion unit into desired DC power. A plurality of DC / DC converters connected in parallel to the output end of the AC / DC converter, and one each at the output end of the plurality of DC / DC converters. It is preferable that an LED light source is connected.

  The LED driving device includes a plurality of AC / DC conversion units that convert AC input power into DC power, and the adjustment unit converts the DC power output from the AC / DC conversion unit into desired DC power. A plurality of DC / DC converters, one DC / DC converter is connected to each of the output terminals of the plurality of AC / DC converters, and one is connected to the output terminals of the plurality of DC / DC converters. The LED light sources are preferably connected one by one.

  In this LED drive device, the control means controls the adjustment means to reduce the power supply amount to the plurality of LED light sources below a rated value, and the abnormality detection means detects the abnormality. Preferably, the power supply to the LED light source is stopped, and the adjustment unit is controlled so that the amount of power supplied to the LED light source in which no abnormality is detected by the abnormality detection unit approaches the rated value.

  In this LED drive device, the control means controls the adjustment means to reduce the power supply amount to the plurality of LED light sources below a rated value, and the abnormality detection means detects the abnormality. Preferably, power supply to the LED light source is stopped, and the adjustment unit is controlled so that the power supply amount to the LED light source in which no abnormality is detected by the abnormality detection unit is set to the rated value.

  In this LED driving device, there are two LED light sources, and the control means is a case where the power supply amounts to the two LED light sources are the same and lower than a rated value, and the abnormality detection means When an abnormality is detected in any one of the LED light sources, the power supply to the LED light source in which the abnormality is detected by the abnormality detection unit is stopped, and the abnormality is not detected by the abnormality detection unit. It is preferable to control the adjusting means so that the amount of power supplied to the light source is doubled within the range of the rated value or less, and the rated value is reached when the rated value is exceeded.

  The lighting fixture of the present invention includes any one of the LED driving devices, a plurality of LED light sources driven by the LED driving devices, and a fixture main body that holds at least the plurality of LED light sources.

  In the LED driving device and the lighting fixture of the present invention, the control unit controls the dimming unit so as to increase the power supply amount to the LED light source in which the abnormality detection unit does not detect abnormality among the plurality of LED light sources. There is an effect that it is possible to suppress a decrease in illuminance when an abnormality occurs in some LED light sources.

It is a circuit diagram which shows embodiment of the LED drive device which concerns on this invention. It is a circuit diagram of the abnormality detection circuit in the same as the above. It is a circuit diagram which shows another embodiment of the LED drive device which concerns on this invention. It is a circuit diagram which shows another embodiment of the LED drive device which concerns on this invention. (a)-(c) is a wave form diagram for operation explanation same as the above. It is a circuit diagram which shows another structure of the 1st DC / DC converter same as the above. Embodiment of the lighting fixture which concerns on this invention is shown, (a) is a side view, (b) is a bottom view.

  Hereinafter, embodiments of an LED driving device according to the present invention will be described in detail with reference to the drawings.

  As shown in FIG. 1, the LED driving device A1 of this embodiment includes two DC / DC converters 1 and 2, an abnormality detection circuit 3, a power factor correction circuit 4, a full-wave rectifier 5, and a dimming circuit. And so on.

  The full-wave rectifier 5 is composed of a diode bridge, and full-wave rectifies the AC voltage / AC current supplied from the AC power source E and outputs the rectified current to the power factor correction circuit 4.

  The power factor correction circuit 4 is a conventionally known step-up chopper circuit composed of a switching element 41 composed of a field effect transistor, a PFC control circuit 40 that controls the switching of the switching element 41, a choke coil 42, a diode 43, a smoothing capacitor 44, and the like. Composed. However, since the operation of such a power factor correction circuit (boost chopper circuit) 4 is well known in the art, a detailed description thereof will be omitted.

  Two DC / DC converters 1 and 2 are connected in parallel to the output terminal of the power factor correction circuit 4. One DC / DC converter (hereinafter referred to as a first converter) 1 is a conventionally known step-down chopper circuit, which is a switching element 11, a first control circuit 10, an inductor 12, a diode 13, a smoothing capacitor 14, a detection winding. It consists of a line 15, a diode 16, and the like. The cathode of the diode 13 is connected to the output terminal on the high potential side of the power factor correction circuit 4, and the anode of the diode 13 is connected to the drain of the switching element 11. The source of the switching element 11 is connected to the output terminal on the low potential side of the power factor correction circuit 4 grounded to the ground. One end of the inductor 12 is connected to the anode of the diode 13, and the other end of the inductor 12 is connected to the low potential side of the smoothing capacitor 14. The high potential side of the smoothing capacitor 14 is connected to the cathode of the diode 13. An LED light source (hereinafter referred to as a first LED light source) B1 is connected to both ends of the smoothing capacitor. Further, the detection winding 15 is magnetically coupled to the inductor 12, one end is connected to the ground, and the other end is connected to the anode of the diode 16. The cathode of the diode 16 is connected to the abnormality detection circuit 3.

  The other DC / DC converter (hereinafter referred to as a second converter) 2 is also a conventionally known step-down chopper circuit, which is a switching element 21, a second control circuit 20, an inductor 22, a diode 23, a smoothing capacitor 24, and a detection winding. 25, diode 26, and the like. The cathode of the diode 23 is connected to the output terminal on the high potential side of the power factor correction circuit 4, and the anode of the diode 23 is connected to the drain of the switching element 21. The source of the switching element 21 is connected to the ground. One end of the inductor 22 is connected to the anode of the diode 23, and the other end of the inductor 22 is connected to the low potential side of the smoothing capacitor 24. The high potential side of the smoothing capacitor 24 is connected to the cathode of the diode 23. An LED light source (hereinafter referred to as a second LED light source) B2 is connected to both ends of the smoothing capacitor 24. The detection winding 25 is magnetically coupled to the inductor 22 and has one end connected to the ground and the other end connected to the anode of the diode 26. The cathode of the diode 26 is connected to the abnormality detection circuit 3.

  After turning on the switching element 11, the first control circuit 10 turns off the switching element 11 when the current (inductor current) flowing through the switching element 11 via the inductor 12 reaches a predetermined peak value. When the switching element 11 is turned off, the magnetic energy accumulated in the inductor 12 is released, and the smoothing capacitor 14 is charged via the diode 13. When the regenerative current flowing from the inductor 12 to the smoothing capacitor 14 becomes zero, the first control circuit 10 turns on the switching element 10 again. In this way, the first control circuit 10 performs switching control of the switching element 10, whereby the DC voltage input from the power factor correction circuit 4 can be stepped down to the DC voltage required for the first LED light source B1. .

  Similarly, after the switching element 21 is turned on, the second control circuit 20 turns off the switching element 21 when a current (inductor current) flowing through the switching element 21 via the inductor 22 reaches a predetermined peak value. When the switching element 21 is turned off, the magnetic energy stored in the inductor 22 is released, and the smoothing capacitor 24 is charged via the diode 23. When the regenerative current flowing from the inductor 22 to the smoothing capacitor 24 becomes zero, the second control circuit 20 turns on the switching element 20 again. In this way, the second control circuit 20 performs switching control of the switching element 20, whereby the DC voltage input from the power factor correction circuit 4 can be stepped down to the DC voltage required for the second LED light source B2. .

  However, the control operation of the first and second control circuits 10 and 20 described above is called a critical mode, but the present invention is not limited to this. That is, the first and second control circuits 10 and 20 turn on the switching elements 11 and 21 when the regenerative current reaches a lower limit value higher than zero (continuous mode), or the regenerative current becomes zero. After that, the switching elements 11 and 21 may be turned on (discontinuous mode).

  The dimming circuit unit 6 reads the dimming level from the dimming signal input from the outside, and gives the read dimming level to the first control circuit 10 and the second control circuit 20. The first control circuit 10 and the second control circuit 20 change the peak value to be compared with the inductor current in accordance with the dimming level given from the dimming circuit unit 6. Then, when the peak value changes, the amount of power supplied to the first LED light source B1 and the second LED light source B2 is increased or decreased to adjust (dimming) the light outputs of the first LED light source B1 and the second LED light source B2. However, the dimming method of the dimming circuit unit 6 is to adjust the dimming level by changing the ratio between the period during which current is supplied from the first and second converters 1, 2 to the LED light sources B1, B2, and the period during which current is stopped. You may use what is called burst dimming. Furthermore, the above-mentioned two light control methods may be combined.

  The abnormality detection circuit 3 is composed of, for example, a comparator or a microcomputer. Then, the abnormality detection circuit 3 detects the abnormality (short circuit or no load) of the first LED light source B1 and the second LED light source B2 based on the detection voltage generated in the detection windings 15 and 25, and the LED light source that has detected the abnormality. An abnormality detection signal is output to the control circuits 10 and 20 corresponding to B1 and B2.

  A specific circuit example of the abnormality detection circuit 3 is shown in FIG. FIG. 2 shows only the circuit configuration corresponding to the detection voltage (first detection voltage) generated in the detection winding 15 of the first converter 1, and the detection voltage generated in the detection winding 25 of the second converter 2. The circuit configuration (excluding the microcomputer 30) corresponding to (second detection voltage) is not shown. However, the circuit configuration corresponding to the second detection voltage is the same as the circuit configuration corresponding to the first detection voltage illustrated in FIG.

  The detection voltage (the first detection voltage and the second detection voltage) is a rectangular wave voltage signal that is zero during the ON period of the switching elements 11 and 21 and is high during the OFF period of the switching elements 11 and 21. The voltage of the hour is correlated with the output voltage of the converters 1 and 2. Therefore, when a short circuit failure occurs in the LED light sources B1 and B2, the output voltage of the converters 1 and 2 is almost zero, so the detection voltage is also close to zero. On the other hand, if the connection between the LED light sources B1 and B2 and the DC / DC converters 1 and 2 is incomplete, or the wiring in the LED light sources B1 and B2 is disconnected, the converter 1 The output voltage of 2 is substantially equal to the input voltage (the output voltage of the power factor correction circuit 4). Therefore, the detection voltage is higher than the normal voltage.

  In the abnormality detection circuit 3, a high-frequency component included in the first detection voltage is removed by a low-pass filter including a resistor R1 and a capacitor C1, and then the first detection voltage is divided by the voltage dividing resistors R2 and R3. The capacitor C2 is charged with the divided first detection voltage, and the voltage across the capacitor C2 is input to the input port of the microcomputer 30. The microcomputer 30 performs A / D conversion on the first detection voltage (divided first detection voltage) input to the input port and compares it with two threshold values.

  If the value obtained by A / D converting the first detection voltage falls below the lower threshold value or exceeds the larger threshold value, the microcomputer 30 indicates that an abnormality has occurred in the first LED light source B1. The first abnormality detection signal shown is output to the first and second control circuits 10 and 20, respectively. Note that the smaller threshold value is set to a value sufficiently smaller than the normal first detection voltage and larger than zero. The larger threshold value is sufficiently larger than the first detection voltage in the normal state, and the first and second values when the output voltages of the first and second converters 1 and 2 are equal to the input voltage are assumed. 2 is set to a value smaller than the detection voltage. Similarly, the abnormality detection circuit 3 compares the value obtained by A / D converting the second detection voltage input to another input port with two threshold values. If the value obtained by A / D converting the second detection voltage is below the lower threshold value or exceeds the larger threshold value, the microcomputer 30 indicates that an abnormality has occurred in the second LED light source B2. The second abnormality detection signal is output to the first and second control circuits 10 and 20, respectively.

  When the first abnormality detection signal is input, the first control circuit 10 stops the first converter 1 by stopping the switching of the switching element 11. When the second abnormality detection signal is input, the second control circuit 20 stops the second converter 2 by stopping the switching of the switching element 21. As a result, power supply to the LED light sources B1 and B2 in which an abnormality (short circuit or no load) has occurred can be stopped, and the converters 1 and 2 can be protected and the abnormal increase in output voltage can be individually controlled.

  Further, when the first abnormality detection signal is not input and the second abnormality detection signal is input, the first control circuit 10 increases the predetermined peak value for turning off the switching elements 11 and 21 higher than normal. Thus, the amount of power supplied from the first converter 1 to the first LED light source B1 is increased. As a result, the amount of light of the first LED light source B1 increases, so that it is possible to suppress a decrease in illuminance when the second LED light source B2 is turned off.

  Similarly, when the second abnormality detection signal is not input and the first abnormality detection signal is input, the second control circuit 20 increases the peak value from the second converter 2 to the second LED light source B2 by increasing the peak value. Increase the amount of power supplied to. As a result, the amount of light of the second LED light source B2 increases, so that it is possible to suppress a decrease in illuminance when the first LED light source B1 is turned off.

  As described above, the LED drive device A1 of the present embodiment is an LED drive device that drives a plurality of LED light sources B1 and B2 by converting input power into desired DC power and feeding the converted DC power. . The LED driving device A1 of this embodiment adjusts the abnormality detection means (abnormality detection circuit 3) for detecting abnormality of the LED light sources B1 and B2 and the DC power supplied to the plurality of LED light sources B1 and B2 separately. Adjusting means (first converter 1 and second converter 2). Further, the LED drive device A1 of the present embodiment includes control means (first control circuit 10 and second control circuit 20). The first control circuit 10 and the second control circuit 20 stop the power supply to the LED light sources B1 and B2 detected by the abnormality detection means 3 among the plurality of LED light sources B1 and B2, and the abnormality detection means 3 The adjusting means 1 and 2 are controlled so as to increase the amount of power supplied to the LED light sources B1 and B2 in which no abnormality is detected.

  Therefore, the first control circuit 10 and the second control circuit 20 are adjusted so as to increase the amount of power supplied to the LED light sources B1 and B2 in which the abnormality detection means 3 has not detected an abnormality among the plurality of LED light sources B1 and B2. Since the means 1 and 2 are controlled, it is possible to suppress a decrease in illuminance when an abnormality occurs. However, if the first abnormality detection signal and the second abnormality detection signal are not input, the first control circuit 10 and the second control circuit 20 resume the switching of the switching elements 11 and 21 that have been stopped, and the peak value. Is preferably returned to the original value (the value before the abnormality detection signal is input). Thereby, it is possible to avoid malfunction when the LED light sources B1 and B2 are replaced and the abnormality (short circuit or no load) is resolved.

  Further, the LED drive device A1 of the present embodiment preferably includes an AC / DC converter (power factor correction circuit 4) that converts AC input power into DC power. Further, the adjusting means 1 and 2 have a plurality of DC / DC converters (first converter 1 and second converter 2) for converting DC power output from the AC / DC converter 4 into desired DC power. Is preferred. Furthermore, a plurality of DC / DC converters 1 and 2 are connected in parallel to the output terminal of the AC / DC converter 4, and one LED light source B 1 is connected to each of the output terminals of the plurality of DC / DC converters 1 and 2. B2 is preferably connected. With such a configuration, one AC / DC conversion unit 4 can be shared by the plurality of DC / DC conversion units 1 and 2, so that the circuit configuration can be simplified.

  Alternatively, the LED drive device A2 according to another embodiment of the present invention includes a plurality of AC / DC conversion units (power factor improvement circuits 4A and 4B) that convert AC input power into DC power as shown in FIG. It doesn't matter. The DC / DC converters 1 and 2 are connected to the output terminals of the plurality of AC / DC converters 4A and 4B one by one, and the LED light source is connected to the output terminals of the plurality of DC / DC converters 1 and 2 one by one. B1 and B2 are preferably connected. As shown in FIG. 4, an abnormality detection circuit 3 is provided for each of the two converters 1 and 2, and the abnormality detection signal of each abnormality detection circuit 3 is supplied to the control circuits 10 and 20 of the two converters 1 and 2, respectively. It does not matter if it is configured to output to

  By the way, when the control means 10 and 20 control the adjustment means 1 and 2 to reduce the power supply amount to the plurality of LED light sources B1 and B2 below the rated value, the abnormality detection means 3 detects the abnormality. It is preferable to stop the power supply to the LED light sources B1 and B2. Furthermore, it is preferable that the control means 10 and 20 control the adjusting means 1 and 2 so that the amount of power supplied to the LED light sources B1 and B2 in which no abnormality is detected by the abnormality detection means 3 approaches the rated value.

  For example, as indicated by a broken line α in FIG. 5A, the control means (the first control circuit 10 and the second control circuit 20) outputs the output of the adjustment means (the first converter 1 and the second converter 2) by the initial illumination correction. Is adjusted (decreased). When an abnormality occurs in the first LED light source B1, the first control circuit 10 stops the first converter 1. On the other hand, if the second LED light source B2 is normal, the second control circuit 20 stops the initial illuminance correction and increases the power supply amount of the second converter 2 as shown by the solid line β in FIG. It is preferable to bring the light output of the 2LED light source B2 close to the rated value (100%). Alternatively, as indicated by a solid line γ in FIG. 5B, the second control circuit 20 increases the power supply amount of the second converter 2 to set the light output of the second LED light source B2 to the rated value (100%). I do not care. Thus, there is an advantage that the control of the first control circuit 10 and the second control circuit 20 becomes easier when the light output is set to the rated value. Alternatively, as another control example, when low dimming (for example, dimming level of 50% or less), the light output is controlled to be substantially equal to the original brightness as indicated by the solid line β in FIG. The output may be twice the original light output).

  In addition, although LED drive device A1, A2 of this embodiment is comprised so that two LED light source B1, B2 may be driven (lighted), you may be comprised so that three or more LED light sources may be driven. Absent. Further, the plurality of LED light sources B1 and B2 driven by the LED driving devices A1 and A2 of the present embodiment do not have to be the same (rated voltage and rated current are the same), and at least one of the rated voltage and the rated current is required. May be different.

  By the way, there is a possibility that the output voltage of the power factor correction circuit 4 may be increased due to a light load at the time of an abnormality in which only one converter 1 or 2 is operated, compared with a time when the two converters 1 and 2 are normally operated. high. Further, when the load is light, a ripple occurs in the output voltage of the power factor correction circuit 4, and the current flowing through the LED light source B1 or B2 may fluctuate due to the ripple, which may cause flicker.

  However, in the LED driving devices A1 and A2 of this embodiment, since the output of the converter 1 or 2 that continuously operates is increased, the power factor correction circuit 4 of the power driving circuit 4 is compared with the case where the output is not increased. An increase in output voltage and occurrence of ripples can be suppressed.

  The first and second converters 1 and 2 may have a circuit configuration in which the switching elements 11 and 21 are on the high potential side (high side) as shown in FIG. Only the converter 1 is shown, and the second converter 2 is not shown).

  An embodiment of a lighting fixture according to the present invention is shown in FIG. The lighting fixture 7 of this embodiment is used for a street lamp or the like, and includes a fixture main body 70 attached to the tip of a pole P standing on the ground.

  The instrument body 70 is formed into a flat rectangular box shape by aluminum die casting, and the first LED light source B1 and the second LED light source B2 are accommodated therein. In the fixture body 70, a rectangular window hole 71 is opened on the lower surface facing the two LED light sources B1 and B2, and light emitted from the LED light sources B1 and B2 is radiated downward through the window hole 71. However, the window hole 71 is closed by a transparent panel 72 made of tempered glass.

  In addition, an LED driving device A1 is also housed in the instrument body 70. The LED driving device A1 is supplied with AC voltage / AC current from an AC power source E via a power line (not shown) wired inside the pole P.

  In addition, the lighting fixture which concerns on this invention is not limited to a street lamp, For example, the lighting fixture etc. which illuminate the inside of a tunnel may be sufficient.

A1 LED drive device
B1, B2 LED light source 1 1st DC / DC converter (adjustment means)
2 Second DC / DC converter (adjustment means)
3 Abnormality detection circuit (abnormality detection means)
10 First control circuit (control means)
20 Second control circuit (control means)

Claims (7)

An LED driving device for driving a plurality of LED light sources by converting input power into desired DC power and feeding the converted DC power,
An abnormality detection means for detecting an abnormality of the LED light source, an adjustment means for adjusting the DC power supplied to the plurality of LED light sources, and the abnormality detection means for detecting an abnormality among the plurality of LED light sources And a control means for controlling the adjusting means so as to stop the power supply to the LED light source and to increase the power supply amount to the LED light source for which the abnormality detection means has not detected an abnormality. LED drive device.   A plurality of DC / DC converters for converting the DC power output from the AC / DC converter into desired DC power, comprising an AC / DC converter that converts AC input power into DC power; A plurality of the DC / DC converters are connected in parallel to the output terminals of the AC / DC converters, and the LED light sources are connected to the output terminals of the plurality of DC / DC converters one by one. The LED driving device according to claim 1.   A plurality of AC / DC converters for converting AC input power into DC power, wherein the adjusting means converts the DC power output from the AC / DC converter into desired DC power; A plurality of the AC / DC converters, the DC / DC converters are connected to the output terminals of the plurality of AC / DC converters, and the LED light sources are connected to the output terminals of the plurality of DC / DC converters. The LED driving device according to claim 1, wherein the LED driving device is connected.   The control means supplies power to the LED light source in which an abnormality is detected by the abnormality detection means when the adjustment means is controlled to reduce the power supply amount to the plurality of LED light sources below a rated value. 4. The control unit according to claim 1, wherein the adjusting unit is controlled so as to approach the rated value with a power supply amount to the LED light source in which an abnormality is not detected by the abnormality detecting unit. LED drive device of clause.   The control means supplies power to the LED light source in which an abnormality is detected by the abnormality detection means when the adjustment means is controlled to reduce the power supply amount to the plurality of LED light sources below a rated value. 5. The LED driving apparatus according to claim 4, wherein the LED driving device is controlled so as to stop and to adjust the power supply amount to the LED light source in which no abnormality is detected by the abnormality detecting unit to the rated value.   The number of the LED light sources is two, and the control means is a case where the amount of power supplied to the two LED light sources is the same and is lower than a rated value. When an abnormality is detected in the LED light source, power supply to the LED light source in which an abnormality is detected by the abnormality detection unit is stopped, and a power supply amount to the LED light source in which no abnormality is detected by the abnormality detection unit The LED according to any one of claims 1 to 3, wherein the adjusting means is controlled to increase to double within a range of a rated value or less and to reach a rated value when the rated value is exceeded. Drive device.   An illumination fixture comprising: the LED drive device according to any one of claims 1 to 6, a plurality of LED light sources driven by the LED drive device, and a fixture main body that holds at least the plurality of LED light sources.

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