JP2017123255A - LED lighting device - Google Patents

Abstract

[PROBLEMS] To control turning on / off of a plurality of LED illumination units with a single control unit, and fading in, the timing through lighting is slightly shifted due to differences in the types of LED illumination units or variations in the same model. Since each LED illuminating unit starts to illuminate apart, the sense of quality is impaired. If the fade-out is performed when the light is turned off, the light is turned off separately, causing the same problem. For each LED illumination unit, a reference value of a forward current that emits light with a light intensity that is not determined to be lit by the naked eye is set, and at the time of lighting, the forward current value of each LED illumination unit is set to the reference value. Set to a lower lighting standby value, increase the forward current value of all LED lighting units from that state, and set the forward current value of each LED lighting unit to a lighting standby value higher than the above reference value when extinguished In this state, the forward current values of all the LED illumination units are reduced. [Selection] Figure 3

Description

  The present invention relates to an LED illumination device that controls turning on and off a plurality of LED illumination units with a single control unit.

  Many lighting fixtures using LEDs (light emitting diodes) as light sources have been proposed, and some of such LED lighting fixtures are used by being fixed to a ceiling or a wall surface. And when using as interior lighting, it may be comprised so that a some LED lighting fixture may be turned on / off by one lighting switch.

  On the other hand, when turning on / off the switch, the LED often emits light at a specified light intensity immediately. However, it has been proposed that the LED is dimmed and gradually becomes brighter ( Fade-in). In addition, in the case of having such a dimming function, when the lighting switch is turned off, the dimming is performed so that the light is gradually darkened and finally turned off instead of turning off instantaneously ( (Fade out) (see, for example, Patent Document 1).

Japanese Patent Laying-Open No. 2015-18636 (paragraph [0019])

  As a characteristic of the LED, the forward current (If) does not flow through the LED and the LED does not emit light until the forward voltage (Vf) applied to both ends of the LED becomes a constant value. When the forward voltage exceeds a certain value, a forward current suddenly flows and emits light. In the light-emitting state, the luminous intensity, which is the brightness of the LED, is approximately proportional to the forward current, and so-called constant current control is performed in which the forward current value is controlled rather than controlling the voltage applied to the LED.

  When fading in at the time of lighting as described above, the forward current is gradually increased to the set current value.

  However, when such a fade-in is performed when a single control unit controls turning on / off of a plurality of LED illumination units, the timing to start lighting due to differences in the types of LED illumination units or variations in the same model. Is slightly shifted, and each LED illumination unit starts to light apart, resulting in a problem that the sense of quality is impaired.

  Such a problem also occurs at the time of fading out at the time of turning off, and after each LED illumination part gradually becomes dark, there is a phenomenon that the lights are turned off at different timings.

  Therefore, in view of the above problems, the present invention provides an LED lighting device that can match the timing of turning on and off when a plurality of LED lighting units are faded in and faded out by a single control unit. And

  In order to solve the above problems, the LED lighting device according to the present invention is composed of one control unit and a plurality of LED lighting units connected to the control unit, and by increasing or decreasing the current supplied from the control unit, In the LED lighting device in which each LED illumination unit is synchronized with each other and dimmed at a predetermined speed from an unlit state to a predetermined light intensity when turned on, and is dimmed at a predetermined speed from the predetermined light intensity to the unlit state when turned off. For each LED illumination unit, a reference value for the forward current that emits light at a light intensity that is not determined to be lit by the naked eye is set, and at the time of lighting, the forward current value of each LED illumination unit is turned on lower than this reference value. The standby value is set to increase the forward current value of all the LED illumination units from that state, and at the time of extinction, the forward current value of each LED illumination unit is set to an extinction standby value higher than the reference value. Constant, and the off synchronization means that reducing the forward current value of all the LED illumination unit from that state, characterized in that provided in the control unit.

  If the forward current is very small, even if the LED is physically emitting light, there is a state where it is not recognized as being emitted by the naked eye. Even if the direction current value is set to a lighting standby value lower than the reference value, it is not recognized by the naked eye that the lighting is on. By aligning the forward current values of all the LED lighting units with the lighting standby value and increasing the forward current value from the ready state, the naked eye recognizes that all the LED lighting units are lit at the same timing. . Further, in the case of turning off, the forward current value is temporarily kept at a turn-off standby value higher than the reference value, and the forward current value from the state in which the forward current values of all the LED illumination units are aligned with the turn-off standby value. By reducing the value to zero, it can be recognized that all the LED illumination units are extinguished at the same timing.

  Note that there are a plurality of types of LED illumination units that are set in advance. A lighting standby value and a light-off standby value are set for each type, and the type of the LED illumination unit connected to the control unit is automatically set. A model discriminating unit for discriminating may be provided, and the lighting standby value and the extinguishing standby value corresponding to the model discriminated by the model discriminating unit may be used.

  As is clear from the above description, the present invention makes all the lighting timings of all the LED lighting sections coincide even when the dimming control such as fade-in and fade-out is performed when the plurality of LED lighting sections are turned on and off. So that the luxury is not lost.

The figure which shows the installation state of the LED lighting apparatus by this invention Block diagram showing structure of LED lighting device The figure which shows an example of a Vf-If diagram

  Referring to FIG. 1, reference numeral 1 denotes a control unit installed on the ceiling of a bathroom. The single control unit 1 includes three downlights 21, one wall-mounted light 22, and one indirect illumination. The on / off operation of the five LED illuminators of the line lamp 23 is controlled. The power source is an external commercial power source 11, and the LED illumination units 21 to 23 are turned on and off by operating a switch 12 installed outside the bathroom.

  Referring to FIG. 2, a power supply unit 3 for converting AC power from commercial power supply 11 into DC power is provided in control unit 1, and DC power output from power supply unit 3 is connected in parallel. Supplied to the current control units 31 to 35.

  These current control units 31 to 35 control the current value flowing through the LED 2a of the LED illumination units 21 to 23 to a constant value. When the switch 12 is turned on, the current value to the LED 2a is, for example, 20 mA. Control. In addition, the resistor 2b for model identification is connected in parallel with LED2a in each LED illumination part 21-23. The resistance value of the resistor 2b is set in advance depending on the model. The three downlights 21 are each provided with the same resistor 2b, and the wall-mounted light 22 and the line lamp 23 have different resistance values. A resistor is connected.

  Each current control part 31-35 is connected to the microcomputer 4, and this microcomputer 4 determines the electric current value sent through LED2a. Therefore, in the above example, if the current value is gradually increased to 20 mA, each LED illumination section gradually becomes brighter (fade in), and conversely, the current value can be gradually decreased from 20 mA in the lighting state. In this case, the LED illumination unit gradually becomes dark (fade out).

  Referring to FIG. 3, this figure is an example of a Vf-If diagram of an LED. When the forward voltage Vf applied across the LED is lower than the predetermined value Vf1, no forward current If flows through the LED. Since the luminous intensity of the LED is substantially proportional to If, the LED does not light up in a state where If does not flow.

  When the forward voltage Vf exceeds Vf1, the forward current If increases rapidly, and the LED lights up. In the present embodiment, the microcomputer 4 controls the current control units 31 to 35 so that If becomes 20 mA in the 100% lighting state. When a plurality of LEDs are connected in series in the LED illumination unit, Vf in FIG. 3 indicates a voltage applied to both ends of one LED.

  When the switch 12 is turned on, the microcomputer 4 controls each of the current control units 31 to 35 to set Lf flowing through the LED to 20 mA. At that time, the microcomputer 4 performs control to gradually increase the current value. However, it is difficult to brighten all the LED illumination units in the same manner due to differences in the models of the LED illumination units 21 to 23, temperature changes, variations among the same model, and the like. In particular, it is difficult to make the timing when the light is turned off to the lighted state, so that the LED illumination units 21 to 23 start to light apart.

  Therefore, an If value that is physically turned on but cannot be recognized by the naked eye is set in advance as a reference value Ia, and a lighting standby value Ion lower than the reference value Ia is set. When the switch 12 is turned on, the microcomputer 4 controls the current control units 31 to 35 to set the current value flowing through the LED illumination units 21 to 23 to Ion. Even if the timing of reaching Ion is deviated for each LED illumination unit 21 to 23, the microcomputer 4 waits for the current values of all the current control units 21 to 23 to become Ion, and all the current control units 21 to 23 After the current value becomes Ion, the current value is increased so that each forward current value becomes 20 mA. Then, with the naked eye, all the LED illumination units start to light up at the same timing, and further appear to be in a 100% lighted state in synchronization.

  When the light is turned off, a turn-off standby value Ioff higher than the reference value Ia for the forward current is set so that the LED illuminators 21 to 23 are not turned off separately, and from 20 mA to Ioff when the light is turned off. By gradually reducing the forward current and setting each current to zero from the state in which the forward current values flowing through all the LED illumination units are equal to Ioff, all LED illumination units are lit 100% at the same time with the naked eye. It seems to fade from the state and turn off at the same timing.

  By the way, as described above, if Vf is lower than Vf1, If does not flow, therefore, the LED does not emit light. Therefore, a voltage lower than Vf1 is applied to the LED illumination units 21 to 23, and the model is discriminated from the current value flowing in the model identification resistor connected in parallel to the LED. And if the model of the LED illumination part connected is discriminate | determined, you may make it use Ion and Ioff set according to the model.

  In addition, if the control unit 1 is provided with a plurality of connection ports and the LED illumination unit is detachably connected to the connection ports, a connection unit to which the LED illumination unit is not connected can be provided by the operation of model identification. Can be determined.

  In addition, this invention is not limited to an above-described form, You may add a various change in the range which does not deviate from the summary of this invention.

1 Control unit 2a LED
2b Resistance 3 Power supply unit 4 Microcomputer 11 Commercial power supply 12 Switch 21 Downlight 22 Wall-mounted light 23 Line light Ia Reference value Ioff Light-off standby value Ion Light-on standby value

Claims (2)

  Consists of one control unit and a plurality of LED illumination units connected to the control unit, and the LED illumination units are synchronized with each other by increasing / decreasing the current supplied from the control unit, and turned off when turned on In the LED lighting device that is dimmed at a predetermined speed from a predetermined light intensity to a predetermined light intensity and is dimmed at a predetermined speed from the predetermined light intensity to the light-off state when the light is turned off, it is not determined that each of the LED lighting parts is lit with the naked eye Set a reference value for forward current that emits light, and at the time of lighting, set the forward current value of each LED illumination unit to a lighting standby value lower than this reference value, and from that state all LED illumination units While increasing the forward current value, at the time of turning off, the forward current value of each LED illumination unit is set to a turn-off standby value higher than the reference value, and from that state, the forward current value of all LED illumination units is set. The off synchronization means points to lack LED lighting device is characterized in that provided in the control unit.   The LED illumination unit has a plurality of preset types, and a lighting standby value and a light-off standby value are set for each type, and the type of the LED lighting unit connected to the control unit is automatically determined. 2. The LED lighting device according to claim 1, wherein a model distinguishing unit is provided, and a lighting standby value and a light-off standby value corresponding to the model determined by the model determining unit are used.

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