JP6611045B2 - Lighting device and lighting apparatus - Google Patents

Description

  The present invention relates to a lighting device and a lighting fixture.

  As a conventional example, an illumination device described in Patent Document 1 is illustrated. The lighting device described in Patent Literature 1 includes a light emitting module having a plurality of LED elements, a power supply unit that supplies power to the light emitting module, and an illuminance sensor provided in the light emitting module. The power supply unit includes a power supply voltage conversion unit that converts the input voltage to output to the light emitting module, and a control unit that controls the power supply voltage conversion unit according to a comparison result obtained by comparing the detection value of the illuminance sensor with a threshold value. ing. The control unit has different threshold values depending on whether the light emitting module is turned off or on. The threshold value when the light is turned off is set to be higher than the threshold value when the light is emitted by the light-emitting module incident on the illuminance sensor and the detection value is increased by an amount corresponding to the increase.

  The conventional example described in Patent Document 1 enables normal control of lighting and extinguishing of the light emitting module even when light from the light emitting module affects detection by the illuminance sensor.

JP 2013-201010 A

  Incidentally, in the conventional example described in Patent Document 1, the threshold value is obtained by measurement or calculation for each type of lighting device, and is set in advance in a table of a storage unit included in the control unit. However, the amount of light incident on the illuminance sensor among the light emitted from the light emitting module may vary depending on factors such as variations in the light amount of the light emitting module and temperature characteristics. Therefore, it is difficult to prevent malfunction caused by light emitted from the light emitting module only with the configuration of the conventional example described in Patent Document 1.

  An object of the present invention is to provide a lighting device and a lighting fixture that can suppress malfunctions regardless of factors such as variations in the amount of light of a light source.

  A lighting device according to an aspect of the present invention includes a power supply unit that supplies power to a light source to turn on the light, and a control unit that controls the power supply unit to turn on and off the light source. Further, the lighting device outputs a first photoelectric conversion unit that outputs a first detection signal having an amount of electricity corresponding to the amount of incident light of external light, and a first amount of electricity that corresponds to the amount of incident light of light emitted from the light source. And a second photoelectric conversion unit that outputs two detection signals. The control unit is configured to compare the amount of electricity of the first detection signal with a first threshold value and a second threshold value. The control unit controls the power supply unit to turn on the light source when the amount of electricity of the first detection signal falls below the first threshold value, and the amount of electricity of the first detection signal decreases to the second threshold value. When it exceeds, the power supply unit is controlled to turn off the light source. The second threshold value is higher than the first threshold value. The control unit changes the second threshold value according to the amount of electricity of the second detection signal.

  The lighting fixture which concerns on 1 aspect of this invention is equipped with the said lighting device, the light source made to light by the said lighting device, and the fixture main body which supports the said light source.

  The lighting device and the lighting fixture of the present invention have an effect that malfunction can be suppressed regardless of factors such as variations in the light amount of the light source.

FIG. 1 is a circuit diagram of a lighting device according to an embodiment of the present invention. FIG. 2 is a perspective view of a lighting fixture according to an embodiment of the present invention. FIG. 3 is a front view of the same lighting fixture. 4A and 4B are time charts for explaining operations of the lighting device and the lighting fixture.

  Hereinafter, a lighting device 1 and a lighting fixture 8 according to an embodiment of the present invention will be described in detail with reference to the drawings. The lighting device 1 according to the present embodiment is a lighting device that blinks a light source according to ambient brightness. Further, the lighting fixture 8 according to the present embodiment is a lighting fixture including the lighting device 1. The configurations described in the following embodiments are merely examples of the present invention. The present invention is not limited to the following embodiments, and various modifications can be made according to the design and the like as long as they do not depart from the technical idea of the present invention.

  As shown in FIG. 1, the lighting device 1 according to the present embodiment includes a power supply unit 10 that supplies power to the light source 2 to turn on, and a control unit 11 that controls the power supply unit 10 to turn on and off the light source 2. It has. In addition, the lighting device 1 according to the present embodiment includes a first photoelectric conversion unit 14 that outputs a first detection signal Vx1 having an electric amount corresponding to an incident light amount, and a second detection signal having an electric amount corresponding to the incident light amount. And a second photoelectric conversion unit 15 that outputs Vx2. Furthermore, it is preferable that the lighting device 1 according to the present embodiment (hereinafter abbreviated as the lighting device 1) includes a control power supply circuit 16.

  The light source 2 is preferably composed of a series circuit of a plurality (only three in the drawing) of LEDs (light emitting diodes) 20. However, the number of LEDs 20 constituting the light source 2 is not limited to three, and may be one to two or four or more. Moreover, the light source 2 may be comprised with discharge lamps, such as an organic electroluminescent element, a laser diode, or a fluorescent lamp.

  The power supply unit 10 includes a pair of input terminals 100A and 100B and a pair of output terminals 101A and 101B. The pair of input terminals 100 </ b> A and 100 </ b> B is electrically connected to the AC power supply 4 and receives AC voltage. The power supply unit 10 preferably includes, for example, a power factor correction circuit, a step-down chopper circuit, and a power supply control circuit. The power factor correction circuit converts the AC voltage input from the input terminals 100A and 100B into a DC voltage having a voltage value higher than the peak value of the AC voltage. The step-down chopper circuit steps down the voltage value of the DC voltage output from the power factor correction circuit to a voltage value equal to or lower than the rated voltage of the light source 2. The DC voltage stepped down by the step-down chopper circuit is output to the light source 2 from the pair of output terminals 101A and 101B. The light source 2 is turned on when a DC voltage is applied from the power supply unit 10. The power supply control circuit controls the semiconductor switching elements constituting the power factor correction circuit to make the output voltage of the power factor correction circuit constant. The power supply control circuit controls the switching of the semiconductor switching elements constituting the step-down chopper circuit to make the current flowing through the light source 2 constant. However, the power supply unit 10 does not necessarily include a power factor correction circuit.

  The control power circuit 16 converts the AC voltage supplied from the AC power supply 4 through the resistor R2 into a DC control voltage Vcc of about 5 [V] to 3.3 [V]. Such a control power supply circuit 16 is preferably composed of, for example, a series regulator or a switching regulator.

  For example, the first photoelectric conversion unit 14 includes a photodiode 140 and a resistor 141. The anode of the photodiode 140 is electrically connected to the output terminal of the control power circuit 16. Further, the cathode of the photodiode 140 is electrically connected to one end of the resistor 141. Furthermore, the other end of the resistor 141 is electrically connected to the ground. The photodiode 140 causes more direct current to flow through the resistor 141 as the amount of incident light increases. The resistor 141 converts a direct current supplied via the photodiode 140 into a direct current voltage. That is, the first photoelectric conversion unit 14 is configured to output the first detection signal Vx1 having an electric quantity (DC voltage) corresponding to the amount of incident light.

  For example, the second photoelectric conversion unit 15 includes a photodiode 150, a first resistor 151, a second resistor 152, and a diode 153. The anode of the photodiode 150 is electrically connected to the output terminal of the control power circuit 16. Further, the cathode of the photodiode 150 is electrically connected to one end of the first resistor 151. Furthermore, the other end of the first resistor 151 is electrically connected to the ground. One end of the second resistor 152 is electrically connected to the cathode of the photodiode 150. The other end of the second resistor 152 is electrically connected to the anode of the diode 153. The photodiode 150 causes more direct current to flow through the first resistor 151 as the amount of incident light increases. The first resistor 151 converts a direct current supplied via the photodiode 150 into a direct voltage. That is, the second photoelectric conversion unit 15 is configured to output the second detection signal Vx2 having an electric quantity (voltage value) corresponding to the amount of incident light through the second resistor 152 and the diode 153.

  The control unit 11 preferably includes a comparator 110, a switch element 111, resistors R3 to R5, and the like. The first detection signal Vx1 of the first photoelectric conversion unit 14 is input to the negative input terminal of the comparator 110. The positive input terminal of the comparator 110 is electrically connected to one end of each of the three resistors R3 to R5. The other end of the resistor R3 is electrically connected to the output terminal of the control power supply circuit 16. The comparator 110 operates with the control voltage Vcc supplied from the control power supply circuit 16. The switch element 111 is an NPN bipolar transistor. The base of the switch element 111 is electrically connected to the output terminal of the comparator 110. The emitter of the switch element 111 is electrically connected to the other end of the resistor R4 and the ground. The collector of the switch element 111 is electrically connected to the other end of the resistor R5. The collector of the switch element 111 is electrically connected to the control terminal 102 of the power supply unit 10.

  The comparator 110 compares the voltage of the first detection signal Vx1 input to the negative input terminal with the threshold value input to the positive input terminal. The comparator 110 sets the output to a high level when the voltage value of the first detection signal Vx1 is less than the threshold value, and sets the output to a low level when the voltage value of the first detection signal Vx1 is equal to or greater than the threshold value. The switch element 111 is turned on when the output of the comparator 110 is at a high level, and turned off when the output of the comparator 110 is at a low level. However, the threshold value input to the positive input terminal of the comparator 110 is a value obtained by dividing the control voltage Vcc by the resistor R3 and the resistor R4 when the switch element 111 is OFF. On the other hand, when the switch element 111 is on, the threshold value substantially matches the value obtained by dividing the control voltage Vcc by the resistors R3 and R5. Here, if the resistance value of the resistor R5 is sufficiently smaller than the resistance value of the resistor R4, the threshold value when the switch element 111 is on (first threshold value VT1) is the threshold value when the switch element 111 is off (second threshold value). It is sufficiently smaller than the threshold value VT2). That is, the threshold value input to the positive input terminal of the comparator 110 has hysteresis.

  When the switch element 111 is off, the control terminal 102 of the power supply unit 10 is maintained at a high level via the resistor R5. On the other hand, when the switch element 111 is on, the control terminal 102 of the power supply unit 10 is maintained at a low level via the switch element 111. The power supply control circuit of the power supply unit 10 operates the power factor correction circuit and the step-down chopper circuit when the control terminal 102 is at a high level to turn on the light source 2, and when the control terminal 102 is at a low level, The step-down chopper circuit is stopped and the light source 2 is turned off.

  Here, the cathode of the diode 153 of the second photoelectric conversion unit 15 is electrically connected to the positive input terminal of the comparator 110. That is, the second detection signal Vx2 of the second photoelectric conversion unit 15 is input to the positive input terminal of the comparator 110. Therefore, the second threshold value VT2 input to the positive input terminal of the comparator 110 is a relative value between the voltage value obtained by dividing the control voltage Vcc by the resistors R3 and R4 and the voltage value of the second threshold value VT2. It matches the larger voltage value. That is, the second threshold value VT2 increases as the voltage value of the second detection signal Vx2 of the second photoelectric conversion unit 15 increases.

  The lighting fixture 8 according to the present embodiment is a so-called security light, and is preferably attached to a column 50 (power column or steel pipe pole) standing on the ground or an outer wall of a building as shown in FIG. However, the lighting fixture 8 of the present embodiment is not limited to a security light, and may be a lighting fixture other than the security light, such as a road light or a street light.

  The lighting fixture 8 preferably has a fixture body 80, a globe 81, an arm 82, and the like. The instrument body 80 is preferably formed of a synthetic resin into a long rectangular box shape having an open bottom surface. The globe 81 is preferably formed in a semi-cylindrical shape with a synthetic resin (for example, acrylic resin) having translucency. The globe 81 is provided with a pair of hinge portions 810 at one end portion in the longitudinal direction (upper end portion in FIG. 2). The pair of hinge portions 810 are formed in a semi-cylindrical shape, and are hooked on a pair of shafts provided at one end portion in the longitudinal direction of the instrument body 80 (upper end portion in FIG. 2). In other words, the globe 81 is attached to the instrument body 80 so as to be rotatable between a closed position (see FIG. 2) that closes the lower surface opening of the instrument body 80 and an open position that opens the lower surface opening of the instrument body 80. However, a screw for fastening the globe 81 in the closed position to the instrument body 80 is attached to the other end portion in the longitudinal direction of the globe 81 (lower end portion in FIG. 2).

  The arm 82 preferably has a fixing portion 821. The fixing portion 821 preferably includes a fixing plate 8210 formed in a long rectangular flat plate shape, and a pair of side walls 8211 rising in the thickness direction from both end edges along the longitudinal direction of the fixing plate 8210.

  The fixing plate 8210 of the fixing portion 821 preferably has a first screw insertion hole 8212 made of a darling hole, a second screw insertion hole made of a round hole, and a semicircular screw insertion groove. In addition, it is preferable that a rectangular insertion hole 8215 is provided in each of the pair of side walls 8211 of the fixing portion 821.

  The lighting device 1 and the light source 2 are accommodated in the instrument main body 80 as shown in FIG. The lighting device 1 is preferably arranged at a position closer to the tip (upward) in the instrument body 80. In addition, the first photoelectric conversion unit 14 is arranged near a tip (upper end) in the instrument body 80 where light emitted from the light source 2 is difficult to be incident and external light is easily incident. Is preferable (see FIGS. 2 and 3).

  The eight LEDs 20 constituting the light source 2 are mounted on the surface (lower surface) of the substrate 22 together with the eight lenses 21 as shown in FIG. The substrate 22 is formed in a long rectangular plate shape. Of the eight LEDs 20, four LEDs 20 are mounted in a row in close proximity to one side (left side in FIG. 3) of the substrate 22. Further, the remaining four LEDs 20 out of the eight LEDs 20 are mounted in a line in close proximity to the other side (right side in FIG. 3) of the substrate 22. The eight lenses 21 are mounted on the substrate 22 in a one-to-one correspondence with the eight LEDs 20. That is, the light emitted from the eight LEDs 20 is light-distributed and controlled by the eight lenses 21, and is transmitted to the space through the globe 81. Here, the second photoelectric conversion unit 15 is preferably mounted on the surface of the substrate 22 as shown in FIG. 3 where light emitted from the light source 2 is likely to be incident. That is, a photodiode 150, two resistors 151 and 152 made of a chip resistor, and a chip-type diode 153 are mounted on the LED 20 at the right end on the surface of the substrate 22. Therefore, the light emitted mainly from the light source 2 (the LED 20 thereof) is incident on the photodiode 150 of the second photoelectric conversion unit 15. Thus, if the 2nd photoelectric conversion part 15 is mounted on the surface of the board | substrate 22, the empty space of the board | substrate 22 can be used effectively. In addition, when the lighting device 1 is configured by a printed circuit, the LED 20 and the second photoelectric conversion unit 15 may be mounted on the printed circuit board of the lighting device 1.

  As shown in FIG. 2, the fixing portion 821 of the arm 82 is fixed to the column 50 via the mounting bracket 9. The mounting bracket 9 is formed of a plate material such as a steel plate in the shape of a square plate having a rectangular flat plate-shaped mounting plate 90 and a pair of side plates 91 rising in the thickness direction from both end edges along the longitudinal direction of the mounting plate 90. It is preferable. The mounting plate 90 is preferably provided with three screw holes. Each side plate 91 is preferably provided with a rectangular mounting hole 910.

  Then, the construction procedure of the lighting fixture 8 is demonstrated. First, the worker who performs the construction work fixes the mounting bracket 9 to the column 50 by winding the mounting band 92 inserted through the mounting hole 910 of each side plate 91 around the column 50. Subsequently, the worker covers the fixing portion 821 of the arm 82 from the front of the mounting bracket 9. Then, the operator attaches the three screws 93, 94, 95 inserted into the first screw insertion hole 8212, the second screw insertion hole, and the screw insertion groove of the fixing portion 821 to the mounting plate 90 of the mounting bracket 9. Screw into each of the three screw holes. Thus, the lighting fixture 8 of this embodiment is attached to the support | pillar 50 via the attachment bracket 9. FIG. However, it is also possible to insert the attachment band 92 into the insertion hole 8215 provided in the fixing portion 821 of the arm 82 and fix the fixing portion 821 directly to the support column 50 without using the attachment fitting 9.

  Next, the operation of the lighting device 1 will be described with reference to the time charts of FIGS. 4A and 4B. The horizontal axis in FIGS. 4A and 4B represents time t, and the vertical axis in FIGS. 4A and 4B represents voltage. Moreover, the solid line in FIG. 4A and FIG. 4B has shown the voltage value of the 1st detection signal Vx1 output from the 1st photoelectric conversion part 14, respectively.

  The voltage value of the first detection signal Vx1 gradually decreases as the sunset time approaches. When the voltage value of the detection signal Vx falls below the first threshold value VT1 (time t = t1), the output of the comparator 110 changes from the high level to the low level, and the switch element 111 is turned off. When the switch element 111 is turned off, the power supply control circuit of the power supply unit 10 operates the power factor correction circuit and the step-down chopper circuit to turn on the light source 2. When the switch element 111 is turned on, the threshold value input to the positive input terminal of the comparator 110 increases from the first threshold value VT1 to the second threshold value VT2 (VT20) (see FIG. 4A).

  Here, the amount of light of the LEDs 20 constituting the light source 2 varies due to individual differences of individual LEDs 20, temperature characteristics, and the like. When the light amount of the light source 2 (the total light amount of the eight LEDs 20) is sufficiently larger than the standard light amount, the photo of the first photoelectric conversion unit 14 out of the light emitted from the light source 2 The amount of light incident on the diode 140 also increases. When the incident light quantity of the photodiode 140 increases, the voltage value of the first detection signal Vx1 output from the first photoelectric conversion unit 14 also increases. As a result, when the voltage value of the first detection signal Vx1 exceeds the second threshold value VT2 (VT20), the output of the comparator 110 changes from the low level to the high level, and the switch element 111 is turned on. When the switch element 111 is turned on, the power supply control circuit of the power supply unit 10 stops the power factor correction circuit and the step-down chopper circuit and turns off the light source 2. When the switch element 111 is turned off, the threshold value input to the positive input terminal of the comparator 110 decreases from the second threshold value VT2 (VT20) to the first threshold value VT1.

  However, when the light source 2 is turned off, the amount of light incident on the photodiode 140 decreases, and the voltage value of the first detection signal Vx1 decreases. When the voltage value of the first detection signal Vx1 falls below the first threshold value VT1, the power supply control circuit of the power supply unit 10 operates the power factor correction circuit and the step-down chopper circuit again to turn on the light source 2. As described above, when the amount of light incident on the photodiode 140 of the first photoelectric conversion unit 14 among the light emitted from the light source 2 is large, the light source 2 may repeatedly blink.

  Therefore, as shown in FIG. 4B, the control unit 11 in the present embodiment increases the voltage value of the second detection signal Vx2 output from the second photoelectric conversion unit 15 when the light source 2 is turned on. The second threshold value VT2 (VT20) is increased to VT21 (time t = t1). As a result, even if the light source 2 is turned on and the voltage value of the first detection signal Vx1 rises, it does not exceed the second threshold value VT21. Therefore, the control unit 11 does not control the power supply unit 10 to turn off the light source 2. (See FIG. 4B). Therefore, the lighting device 1 can suppress a malfunction that repeats blinking of the light source 2 regardless of factors such as variations in the light amount of the light source.

  As shown in FIGS. 4A and 4B, the voltage value of the first detection signal Vx1 gradually increases as it approaches the sunrise time. When the voltage value of the first detection signal Vx1 exceeds the second threshold value VT2 (VT20 or VT21) (time t = t2), the output of the comparator 110 changes from low level to high level and the switch element 111 is turned off. To do. When the switch element 111 is turned off, the power supply control circuit of the power supply unit 10 stops the power factor correction circuit and the step-down chopper circuit and turns off the light source 2. When the switch element 111 is turned off, the threshold value input to the positive input terminal of the comparator 110 decreases from the second threshold value VT2 to the first threshold value VT1.

  As described above, the lighting device 1 includes the power supply unit 10 that supplies power to the light source 2 and lights it, and the control unit 11 that controls the power supply unit 10 to turn on and off the light source 2. The lighting device 1 has a first photoelectric conversion unit 14 that outputs a first detection signal Vx1 having an electric amount corresponding to the incident light amount of external light, and an electric amount corresponding to the incident light amount of light emitted from the light source 2. And a second photoelectric conversion unit 15 that outputs a second detection signal Vx2. The control unit 11 compares the electric quantity (voltage value) of the first detection signal Vx1 with the first threshold value VT1 and the second threshold value VT2, and when the electric quantity of the first detection signal Vx1 falls below the first threshold value VT1, The light source 2 is turned on by controlling the unit 10. The control unit 11 is configured to turn off the light source 2 by controlling the power supply unit 10 when the amount of electricity of the first detection signal Vx1 exceeds the second threshold value VT2. The second threshold VT2 is higher than the first threshold VT1. The controller 11 is configured to change the second threshold value VT2 according to the amount of electricity (voltage value) of the second detection signal Vx2.

  If the lighting device 1 is configured as described above, the second threshold value VT2 is changed according to the amount of electricity (voltage value) of the second detection signal Vx2 of the second photoelectric conversion unit 15, and thus the light amount of the light source 2 Regardless of factors such as variations in the number of light sources, it is possible to suppress malfunctions such as repeated blinking of the light source 2.

  In the lighting device 1, the second photoelectric conversion unit 15 is preferably disposed at a place where light emitted from the light source 2 is incident.

  If the lighting device 1 is configured as described above, the light amount of the light source 2 can be easily detected by the second photoelectric conversion unit 15.

  Furthermore, in the lighting device 1, the second photoelectric conversion unit 15 is preferably disposed on the substrate 22 on which the light source 2 is mounted.

  If the lighting device 1 is configured as described above, the empty space of the substrate 22 can be used effectively.

  Further, as described above, the lighting fixture 8 includes the lighting device 1, the light source 2 that is turned on by the lighting device 1, and the fixture main body 80 that supports the light source 2.

  If the lighting fixture 8 is configured as described above, it is possible to suppress malfunctions such as repeated blinking of the light source 2 regardless of factors such as variations in the light amount of the light source 2.

DESCRIPTION OF SYMBOLS 1 Lighting device 2 Light source 8 Lighting fixture 10 Power supply part 11 Control part 14 1st photoelectric conversion part 15 2nd photoelectric conversion part 22 Board | substrate 80 Instrument main body Vx1 1st detection signal Vx2 2nd detection signal VT1 1st threshold value VT2 2nd threshold value

Claims (4)

A power supply unit that supplies power to the light source to turn on, a control unit that controls the power supply unit to turn on and off the light source, and outputs a first detection signal having an electrical quantity corresponding to the amount of incident light of external light A first photoelectric conversion unit, and a second photoelectric conversion unit that outputs a second detection signal having an electrical quantity corresponding to an incident light amount of light emitted from the light source,
The control unit compares the amount of electricity of the first detection signal with a first threshold value and a second threshold value, and controls the power source unit when the amount of electricity of the first detection signal falls below the first threshold value. The light source is turned on, and when the amount of electricity of the first detection signal exceeds the second threshold, the power source is controlled to turn off the light source,
The second threshold value is higher than the first threshold value,
The lighting device according to claim 1, wherein the control unit changes the second threshold value in accordance with an amount of electricity of the second detection signal.   The lighting device according to claim 1, wherein the second photoelectric conversion unit is disposed at a place where light emitted from the light source is incident.   The lighting device according to claim 2, wherein the second photoelectric conversion unit is disposed on a substrate on which the light source is mounted.   A lighting fixture comprising: the lighting device according to claim 1; a light source that is turned on by the lighting device; and a fixture main body that supports the light source.

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