JP6611044B2 - 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 the surrounding environment. 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.

  The objective of this invention is providing the lighting device and lighting fixture which can aim at suppression of a malfunctioning regardless of the difference in surrounding environment.

  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, a control unit that controls the power supply unit to turn on and off the light source, and an amount of electricity corresponding to the amount of incident light. And a photoelectric conversion unit that outputs a detection signal. The control unit is configured to compare the amount of electricity of the 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 falls below the first threshold value, and controls the power supply unit when the amount of electricity exceeds the second threshold value. The light source is turned off. The second threshold value is higher than the first threshold value. The control unit raises the second threshold according to the number of times the light source is blinked by controlling the power supply unit within a predetermined time.

  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 it is possible to suppress malfunctions regardless of differences in the surrounding environment.

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 time chart 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. And a photoelectric conversion unit 14 that outputs a detection signal having an amount of electricity corresponding to the amount of incident light. 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 15.

  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 from the pair of output terminals 101A and 101B to the light source 2 via the detection resistor R1. 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 15 converts the AC voltage supplied from the AC power supply 4 via the resistor R2 into a DC control voltage Vcc of about 5 [V] to 3.3 [V]. Such a control power supply circuit 15 is preferably composed of, for example, a series regulator or a switching regulator.

  The photoelectric conversion unit 14 includes, for example, 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 15. 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 photoelectric conversion unit 14 is configured to output the detection signal Vx having an electric quantity (voltage value) corresponding to the amount of incident light.

  The control unit 11 preferably includes a first control circuit 12 and a second control circuit 13. The first control circuit 12 preferably includes a comparator 120, a switch element 121, resistors R3 to R5, and the like. The detection signal Vx of the photoelectric conversion unit 14 is input to the negative input terminal of the comparator 120. The positive input terminal of the comparator 120 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 15. The comparator 120 operates with the control voltage Vcc supplied from the control power supply circuit 15. The switch element 121 is an NPN type bipolar transistor. The base of the switch element 121 is electrically connected to the output terminal of the comparator 120. The emitter of the switch element 121 is electrically connected to the other end of the resistor R4 and the ground. The collector of the switch element 121 is electrically connected to the other end of the resistor R5. The collector of the switch element 121 is electrically connected to the control terminal 102 of the power supply unit 10.

  The comparator 120 compares the voltage of the detection signal Vx input to the negative input terminal with the threshold value input to the positive input terminal, and outputs a high level when the voltage value of the detection signal Vx is less than the threshold value. When the voltage value of the detection signal Vx is equal to or higher than the threshold value, the output is set to the low level. The switch element 121 is turned on when the output of the comparator 120 is at a high level, and turned off when the output of the comparator 120 is at a low level. However, the threshold value input to the positive input terminal of the comparator 120 is a value obtained by dividing the control voltage Vcc by the resistor R3 and the resistor R4 when the switch element 121 is OFF. On the other hand, when the switch element 121 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 121 is on (first threshold value VT1) is the threshold value when the switch element 121 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 120 has hysteresis.

  When the switch element 121 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 121 is on, the control terminal 102 of the power supply unit 10 is maintained at a low level via the switch element 121. 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.

  The second control circuit 13 preferably includes a detection unit 130 and a variable resistor 131. The detection unit 130 is preferably configured by a microcontroller including a counter, a memory, a timer, and the like, for example. The detection unit 130 compares the voltage across the detection resistor R1 with a reference value. The detection unit 130 determines that the light source 2 is turned on when the voltage across the detection resistor R1 is equal to or higher than the reference value. Further, the detection unit 130 determines that the light source 2 is turned off when the voltage across the detection resistor R1 is less than the reference value. The detection unit 130 counts the elapsed time starting from the time when it is determined that the light source 2 is turned off, and resets the timer count when the elapsed time reaches a predetermined time T1. Furthermore, the detection unit 130 counts the number N of times the light source 2 is turned off again after the light source 2 is turned on within the predetermined time T1. The predetermined time T1 is preferably a time between several seconds and several tens of seconds, for example. The detection unit 130 operates with the control voltage Vcc supplied from the control power supply circuit 15.

  One end of the variable resistor 131 is electrically connected to the positive input terminal of the comparator 120. The other end of the variable resistor 131 is electrically connected to the ground. The resistance value of the variable resistor 131 is changed by the detection unit 130. Here, the variable resistor 131 is electrically connected to the resistor R4 of the first control circuit 12 in parallel. Therefore, the second threshold value VT2 input to the positive input terminal of the comparator 120 is a value obtained by dividing the control voltage Vcc by the resistor R3, the combined resistance of the resistor R4 and the variable resistor 131. That is, the detection unit 130 can adjust the second threshold value VT2 of the comparator 120 by changing the resistance value of the variable resistor 131.

  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. It is preferable that the lighting device 1 is disposed at an upper position in the instrument main body 80. The photoelectric conversion unit 14 is preferably disposed near the upper end in the instrument body 80. It is preferable that the light source 2 is disposed below the lighting device 1 in the appliance main body 80. That is, the light emitted from the light source 2 passes through the globe 81 and is irradiated to the space.

  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 chart of FIG. The horizontal axis in FIG. 3 represents time t, and the vertical axis in FIG. 3 represents voltage. A solid line α in FIG. 3 indicates the voltage value of the detection signal Vx output from the photoelectric conversion unit 14.

  The voltage value of the detection signal Vx 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 120 changes from the high level to the low level, and the switch element 121 is turned off. When the switch element 121 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 121 is turned on, the threshold value input to the positive input terminal of the comparator 120 increases from the first threshold value VT1 to the second threshold value VT2 (VT20).

  Here, when snow is attached to the lighting fixture 8 or there is a highly reflective object such as a white wall near the upper end of the lighting fixture 8, a part of the light emitted from the light source 2 is reflected. Thus, the light may enter the photodiode 140 of the photoelectric conversion unit 14. When light emitted from the light source 2 enters the photodiode 140, the voltage value of the detection signal Vx increases. When the voltage value of the detection signal Vx exceeds the second threshold value VT2 (VT20) (time t = t2), the output of the comparator 120 changes from the low level to the high level, and the switch element 121 is turned on. When the switch element 121 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 121 is turned off, the threshold value input to the positive input terminal of the comparator 120 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 detection signal Vx decreases. When the voltage value of the detection signal Vx falls below the first threshold value VT1 (time t = t3), 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. Further, the threshold value input to the positive input terminal of the comparator 120 increases from the first threshold value VT1 to the second threshold value VT2 (VT20).

  Then, when the light source 2 is turned on and the amount of incident light of the photodiode 140 increases and the voltage value of the detection signal Vx exceeds the second threshold value VT2 (VT20) (time t = t4), the power supply control circuit of the power supply unit 10 again. Stops the power factor correction circuit and the step-down chopper circuit and turns off the light source 2. Further, the threshold value input to the positive input terminal of the comparator 120 decreases from the second threshold value VT2 (VT20) to the first threshold value VT1.

  When the light source 2 is turned off and the voltage value of the detection signal Vx falls below the first threshold value VT1 (time t = t5), 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 Lights up. Further, the threshold value input to the positive input terminal of the comparator 120 increases from the first threshold value VT1 to the second threshold value VT2 (VT20).

  When the light source 2 is turned on and the voltage value of the detection signal Vx exceeds the second threshold value VT2 (VT20) (time t = t6), the power supply control circuit of the power supply unit 10 again turns on the power factor correction circuit and the step-down chopper circuit. Stop and turn off the light source 2. Further, the threshold value input to the positive input terminal of the comparator 120 decreases from the second threshold value VT2 (VT20) to the first threshold value VT1. When the light source 2 is turned off and the voltage value of the detection signal Vx falls below the first threshold value VT1 (time t = t7), the power control circuit of the power supply unit 10 operates the power factor correction circuit and the step-down chopper circuit again. The light source 2 is turned on.

  Here, the detection unit 130 of the second control circuit 13 counts an elapsed time starting from a time point (time t = t2) when the light source 2 is switched from lighting to extinguishing with a timer. Furthermore, the detection unit 130 counts the number N of times the light source 2 is turned off again after the light source 2 is turned on within the predetermined time T1. Then, when the number of times N becomes 2 or more, the detection unit 130 decreases the resistance value of the variable resistor 131 and increases the second threshold value VT2 (VT20) to VT21 (time t = t7). As a result, even if the light source 2 is turned on and the voltage value of the detection signal Vx increases, the second threshold value VT21 is not exceeded, so the first control circuit 12 does not control the power supply unit 10 to turn off the light source 2. . Therefore, the lighting device 1 can suppress a malfunction of repeating the blinking of the light source 2 regardless of differences in the surrounding environment, for example, snow adhesion or the presence of an object with high reflectance. However, the number of times N is not limited to two, and may be three or more. The predetermined time T1 is a first time from when the voltage value of the detection signal Vx falls below the first threshold value VT1 to when the light source 2 is turned on, and after the voltage value of the detection signal Vx exceeds the second threshold value VT2. It may be determined from the total time with the second time until 2 turns off. That is, the power factor correction circuit and the step-down chopper circuit of the power supply unit 10 require a certain amount of time (first time) until the output voltage is stabilized after the switching of the semiconductor switching element is started. Similarly, since the power factor correction circuit and the step-down chopper circuit of the power supply unit 10 have a smoothing capacitor in the output stage, a certain amount of time until the output voltage becomes zero after switching of the semiconductor switching element is stopped ( 2nd time). Therefore, if the predetermined time T1 is equal to or longer than the time obtained by multiplying the total time of the first time and the second time by the upper limit value of the number N (for example, twice), the detection unit 130 erroneously detects blinking of the light source 2. It becomes difficult to do.

  As shown in FIG. 3, the voltage value of the detection signal Vx gradually increases as it approaches the sunrise time. When the voltage value of the detection signal Vx exceeds the second threshold value VT21 (time t = t8), the output of the comparator 120 changes from the low level to the high level, and the switch element 121 is turned off. When the switch element 121 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. Further, when the switch element 121 is turned off, the threshold value input to the positive input terminal of the comparator 120 decreases from the second threshold value VT21 to the first threshold value VT1. Here, when the predetermined time T1 elapses, the detection unit 130 returns the resistance value of the variable resistor 131 to the resistance value before the change (default value) and returns the second threshold value VT2 to the original value (VT20). Good. Alternatively, the detection unit 130 may return the resistance value of the variable resistor 131 to the default value when the control voltage Vcc is no longer supplied from the control power supply circuit 15.

  As described above, the lighting device 1 includes the power source unit 10 that supplies power to the light source 2 to turn on the light, the control unit 11 that controls the power source unit 10 to turn on and off the light source 2, and the amount of electricity corresponding to the amount of incident light. And a photoelectric conversion unit 14 that outputs a detection signal Vx. The controller 11 is configured to compare the amount of electricity (voltage value) of the detection signal Vx with the first threshold value VT1 and the second threshold value VT2. The control unit 11 is configured to control the power supply unit 10 to turn on the light source 2 when the amount of electricity falls below the first threshold value VT1. Further, 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 exceeds the second threshold value VT2. The second threshold VT2 is higher than the first threshold VT1. The control unit 11 increases the second threshold value VT2 according to the number N of times that the light source 2 is blinked by controlling the power supply unit 10 within the predetermined time T1.

  If the lighting device 1 is configured as described above, even if a malfunction that causes the light source 2 to blink once occurs, the malfunction is suppressed regardless of the surrounding environment by increasing the second threshold value VT2 thereafter. Can be achieved.

  In the lighting device 1, the control unit 11 can increase the second threshold value VT <b> 2 when the number N of times the light source 2 is blinked by controlling the power supply unit 10 within the predetermined time T <b> 1 is two or more. preferable.

  If the lighting device 1 is configured as described above, it is possible to prevent the controller 11 from inadvertently raising the second threshold value VT2 and to save energy. If the control unit 11 increases the second threshold value VT2 when the number N is only one, the second threshold value VT2 increases excessively, and the lighting period of the light source 2 is extended to save energy. It will be difficult.

  Further, in the lighting device 1, the predetermined time T1 is a first time from when the amount of electricity falls below the first threshold value VT1 until the light source 2 is turned on, and after the amount of electricity exceeds the second threshold value VT2, the light source 2 is turned off. It is preferable that it is more than the time which multiplied the number of times N to the total time with the 2nd time until it does.

  If the lighting device 1 is configured as described above, erroneous detection of blinking of the light source 2 by the control unit 11 can be suppressed.

  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 regardless of differences in the surrounding environment.

  Incidentally, the detection unit 130 may determine whether the light source 2 is turned on or off by detecting a voltage change at the control terminal 102 of the power supply unit 10 instead of detecting the current flowing through the light source 2.

DESCRIPTION OF SYMBOLS 1 Lighting device 2 Light source 8 Lighting fixture 10 Power supply part 11 Control part 14 Photoelectric conversion part 80 Instrument main body Vx 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 a photoelectric conversion unit that outputs a detection signal having an electrical quantity corresponding to the amount of incident light Prepared,
The control unit compares the amount of electricity of the detection signal with a first threshold value and a second threshold value, and when the amount of electricity falls below the first threshold value, controls the power source unit to turn on the light source, When the amount of electricity exceeds the second threshold, the power supply unit is controlled to turn off the light source,
The second threshold value is higher than the first threshold value,
The said control part raises the said 2nd threshold value according to the frequency | count that the said power supply part was controlled and blinked the said light source within predetermined time, The lighting device characterized by the above-mentioned.   2. The lighting according to claim 1, wherein the control unit increases the second threshold when the number of times the light source is blinked by controlling the power supply unit within a predetermined time is two times or more. apparatus.   The predetermined time includes a first time from when the amount of electricity falls below the first threshold until the light source is turned on, and a second time from when the amount of electricity exceeds the second threshold until the light source is turned off. The lighting device according to claim 2, wherein the time is equal to or more than a time obtained by multiplying the total time with the time by the number of times.   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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