JP7042430B2 - LED lighting device and lighting equipment - Google Patents

Description

The present invention relates to an LED lighting device and a luminaire for lighting a plurality of LED (Light Emitting Diode) loads having different emission colors.

Patent Document 1 discloses a lighting device capable of dimming and toning by sequentially switching and lighting a plurality of LEDs having different emission colors and adjusting the intensity and mixing ratio of each emission color.

Japanese Unexamined Patent Publication No. 2004-311635

However, according to the above-mentioned prior art, when there is a non-lighting color in the progressive lighting, for example, when an LED light source of four RGBW colors can be turned on, two of them are turned on and the other two colors are not turned on. There is a problem that the light-off section becomes long and color flicker is likely to occur. Here, the progressive lighting means lighting in which a plurality of LED light sources having different emission colors are sequentially switched and turned on within a predetermined fixed time, and this is repeated. In addition, color flicker means that when a fast-moving object such as a fan blade exists under the illumination light, the individual emission color of the LED light source appears on the object and is perceived by humans. To say. If the color flickers intensely, it may cause discomfort or discomfort to the person.

Therefore, an object of the present invention is to provide an LED lighting device and a lighting fixture that are less likely to cause color flicker when there is a non-lighting color in progressive lighting.

In order to achieve the above object, one form of the LED lighting device according to the present invention is an LED lighting device that lights an N LED load having an emission color of N (N is an integer of 2 or more). A power supply circuit that supplies power to the N LED loads, a selector circuit that supplies power to the selected LED load from the power supply circuit by selecting one LED load from the N LED loads, and a periodic cycle. The control circuit includes a control circuit for setting N time slots and performing progressive control in which the N LED loads are cyclically selected by the selector circuit in the N time slots, and the control circuit is M (M). Is an integer smaller than N) When a toning instruction is received instructing that the LED load is turned on and the (NM) LED load is not turned on, (i) in the N time slots. A first control that causes the selector circuit to cyclically select the M LED loads and causes the selector circuit to select at least one LED load among the M LED loads in a plurality of time slots. (Ii) A second control in which M periodic time slots are set and the M LED loads are cyclically selected by the selector circuit in the M time slots. conduct.

Further, the lighting device according to the present invention includes the above-mentioned LED lighting device and the above-mentioned plurality of LED loads.

According to the LED lighting device and the lighting fixture according to the present invention, there is an effect that color flicker is less likely to occur when there is a non-lighting color in progressive lighting.

FIG. 1 is a block diagram showing a configuration example of a lighting fixture having an LED lighting device according to the first embodiment. FIG. 2 is a diagram showing an example of a current waveform by progressive control that causes the lighting fixture according to the first embodiment to emit light in all colors. FIG. 3A is a diagram showing an example of a current waveform by the first control for causing the lighting fixture according to the first embodiment to emit two colors. FIG. 3B is a diagram showing an example of a current waveform by the second control for causing the lighting fixture according to the first embodiment to emit two colors. FIG. 3C is a diagram showing another example of the current waveform by the second control for causing the lighting fixture according to the first embodiment to emit two colors. FIG. 4A is a diagram showing an example of a current waveform by the first control for causing the lighting fixture according to the first embodiment to emit light in three colors. FIG. 4B is a diagram showing an example of a current waveform by the second control in which the luminaire according to the first embodiment emits three colors. FIG. 5 is a diagram showing a circuit configuration example of a lighting fixture having the LED lighting device according to the first embodiment. FIG. 6 is a diagram showing a current waveform and a voltage waveform of each part by progressive control in which the lighting fixture according to the first embodiment emits light in all colors. FIG. 7A is a diagram showing a current waveform and a voltage waveform of each part in the first control for causing the lighting fixture according to the first embodiment to emit two colors. FIG. 7B is a diagram showing a current waveform and a voltage waveform of each part in the second control for causing the lighting fixture according to the first embodiment to emit color light. FIG. 8A is a diagram showing an example of a waveform of a current by progressive feed control including a non-lighting color according to the second embodiment. FIG. 8B is a diagram showing an example of a waveform of a current under the first control corresponding to FIG. 8A. FIG. 8C is a diagram showing an example of a waveform of a second controlled current corresponding to FIG. 8B. FIG. 9 is a diagram showing an example of current waveforms in the progressive control, the transition period, and the first control according to the third embodiment. FIG. 10 is a diagram showing an example of current waveforms in the progressive control, the transition period, and the second control according to the fourth embodiment. FIG. 11 is a diagram showing an example of current waveforms in the progressive control, the transition period, and the second control according to the fifth embodiment. FIG. 12A is a diagram showing an external example of a lighting fixture having an LED lighting device according to each embodiment. FIG. 12B is a diagram showing another appearance example of the lighting fixture having the LED lighting device according to each embodiment. FIG. 12C is a diagram showing still another appearance example of the lighting fixture having the LED lighting device according to each embodiment. FIG. 13 is a diagram showing a configuration of a lighting fixture as a comparative example. FIG. 14A is a diagram showing a current waveform in a lighting operation in which four colors are emitted in a lighting fixture as a comparative example. FIG. 14B is a diagram showing a current waveform in a lighting operation in which two colors are emitted in a lighting fixture as a comparative example.

(Knowledge that became the basis of the present invention)
The present inventor has found that the following problems arise with respect to the lighting device described in the "Background Technology" column.

First, the lighting fixture according to the knowledge of the present inventor will be described as a comparative example.

FIG. 13 is a diagram showing a configuration of a lighting fixture as a comparative example according to the findings of the present inventor. The lighting fixture in the figure includes a power supply circuit 90, LED loads 91 to 94, and switching elements SW3 to SW6. The power supply circuit 90 has switching elements SW1, SW2, and an inductor L0, and is a so-called step-down chopper type DC-DC converter. The switching elements SW1 and SW2 are controlled so as to be exclusively turned on. The inductor L0 stores and discharges energy supplied from the connection points of the switching elements SW1 and SW2.

The LED loads 91-94 have different emission colors. In the figure, it is assumed that the emission colors of the LED loads 91 to 94 are red, green, blue, and white in this order.

The switching elements SW3 to SW6 are controlled so as to be turned on exclusively in order within one cycle.

As the operation of the lighting fixture of such a comparative example, a lighting operation of lighting four colors (that is, all colors) and a lighting operation of lighting only two of the four colors will be described.

FIG. 14A is a diagram showing a current waveform in a lighting operation in which four colors are emitted in a lighting fixture of a comparative example. The vertical axis of the figure shows the inductor current IL. The inductor current IL is the output current of the power supply circuit 90 supplied to any LED load via the inductor L0. The horizontal axis shows time.

As shown in FIG. 14A, the LED loads 91 to 94 make a round in the period Tc and emit light exclusively. This operation is called progressive lighting. The period Tc is divided into four sections, Tr, Tg, Tb, and Tw. The sections Tr, Tg, Tb, and Tw correspond to the emission colors of the LED loads 91 to 94, which are red, green, blue, and white. The cycle Tc is a sufficiently short time so that the human eye does not feel any change. To the human eye, a mixed color in which four colors are mixed is seen as a single color of illumination light.

FIG. 14B is a diagram showing a current waveform in a lighting operation in which two colors are emitted in a lighting fixture of a comparative example. The figure shows a two-color lighting operation in which the LED loads 93 and 94 corresponding to blue and white are turned off and the LED loads 91 and 92 corresponding to red and green are turned on among the four colors. In this case, to the human eye, a mixed color in which two colors of red and green are mixed is seen as a single color of illumination light.

By the way, the two-color lighting of FIG. 14B has a problem that color flicker is likely to occur because a long turn-off section Toff occurs as compared with the all-color lighting of FIG. 14A. Color flicker means that when a fast-moving object exists under the illumination light, the individual emission color of the LED light source appears on the object and is perceived by a person. Fast-moving objects include, for example, the blades of a fan in a living room, the movement of a ball or a person's limbs in a gymnasium, and the like. If the color flickers intensely, it may cause discomfort or discomfort to the person.

In order to solve such a problem, the LED lighting device according to one aspect of the present invention is an LED lighting device that lights an N LED load having an emission color of N (N is an integer of 2 or more). A power supply circuit that supplies power to the N LED loads, a selector circuit that supplies power to the selected LED load from the power supply circuit by selecting one LED load from the N LED loads, and a cycle. The control circuit is provided with a control circuit for setting the N time slots and performing progressive control in which the N LED loads are cyclically selected by the selector circuit in the N time slots. (I) When a color matching instruction is received instructing that (M is an integer smaller than N) LED loads are turned on and (NM) LED loads are not turned on, (i) the N times. In the slot, the M LED loads are cyclically selected by the selector circuit (32), and at least one of the M LED loads is selected by the selector circuit in a plurality of time slots. The first control and (ii) set periodic M time slots instead of the N time slots, and cyclically select the M LED loads in the M time slots. Either one of the second controls, which causes the circuit to select, is performed.

As a result, there is no non-lighting time slot, that is, there is no long turn-off section Toff. Therefore, it is possible to prevent color flicker when there is a non-lighting color in the progressive lighting.

Here, the time slot refers to an individual time frame in which a plurality of LED loads are sequentially lit, the time is periodically divided, and one cycle is further divided into a plurality of times. One time slot is assigned to one LED load as a time frame for lighting.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, all of the embodiments described below show a preferable specific example of the present invention. The numerical values, shapes, materials, components, arrangement positions of the components, connection forms, etc. shown in the following embodiments are examples, and are not intended to limit the present invention. Further, among the components in the following embodiments, the components not described in the independent claims showing the highest concept of the present invention will be described as arbitrary components constituting the more preferable form. Further, each figure is a schematic view and does not necessarily represent exact dimensions.

(Embodiment 1)
[1.1 Configuration of LED lighting device and lighting equipment]
First, a configuration example of the lighting fixture 100 including the LED lighting device 30 according to the first embodiment will be described.

FIG. 1 is a block diagram showing a configuration example of a lighting fixture 100 having an LED lighting device 30 according to the first embodiment. The lighting fixture 100 in the figure includes an AC-DC power supply 10, a light source 20, and an LED lighting device 30.

The AC-DC power supply 10 is connected to, for example, a commercial 100V power supply, inputs AC power, and converts it into DC power.

The light source 20 includes LED loads 21 to 24. The LED loads 21 to 24 have different emission colors. It is assumed that the emission colors of the LED loads 21 to 24 are, for example, R (red), G (green), B (blue), and W (white).

The LED lighting device 30 is a device that lights a plurality of LED loads 21 to 24 having different emission colors. Therefore, the LED lighting device 30 includes a power supply circuit 31, a selector circuit 32, and a control circuit 33.

The power supply circuit 31 is a DC-DC converter that converts DC power from the AC-DC power supply 10 into DC power having different voltages and supplies the converted DC power to the light source 20.

The selector circuit 32 selects one LED load from the plurality of LED loads 21 to 24, so that the selected LED load is supplied with power from the power supply circuit 31. Therefore, the selector circuit 32 includes switching elements M3 to M6. Each of the switching elements M3 to M6 is connected in series with the LED load of any one of the plurality of LED loads 21 to 24. For example, in FIG. 1, the switching element M3 is connected in series with the LED load 21. The switching element M4 is connected in series with the LED load 22. The switching element M5 is connected in series with the LED load 23. The switching element M6 is connected in series with the LED load 24. These switching elements M3 to M6 are controlled to be exclusively turned on, for example. As a result, the LED loads 21 to 24 exclusively emit light, that is, one by one.

The control circuit 33 controls the selector circuit 32 so as to sequentially and cyclically select one LED load from the plurality of LED loads 21 to 24. Specifically, the control circuit 33 sets periodic N time slots, and performs progressive control in which N LED loads are cyclically selected by the selector circuit 32 in the N time slots. Here, N is the same as the number of LED loads 21 to 24, and in FIG. 1, N = 4. The progressive control is a lighting operation in which all colors (four colors in FIG. 1) are turned on.

Further, when the control circuit 33 receives a toning instruction instructing that M (M is an integer smaller than N) LED loads be turned on and (NM) LED loads are not turned on, the control circuit 33 receives a toning instruction. One of the first control and the second control is performed.

(I) In the first control, the control circuit 33 causes the selector circuit (32) to cyclically select M LED loads in N time slots, and at least one of the M LED loads. Let the selector circuit 32 select one LED load in a plurality of time slots. This eliminates the absence of empty time slots and does not create a longer turn-off period than the time slots. Therefore, even when there is a non-lighting LED load, color flicker is less likely to occur.

(Ii) In the second control, the control circuit 33 sets periodic M time slots, and causes the selector circuit 32 to cyclically select M LED loads in the M time slots. This eliminates the absence of empty time slots and does not create a longer turn-off period than the time slots. Therefore, even when there is a non-lighting LED load, color flicker is less likely to occur.

Next, an example of a lighting state in which the four-color LED loads 21 to 24 are lit in all colors in the above-mentioned progressive control, that is, an example of all-color light emission will be described.

FIG. 2 is a diagram showing an example of a current waveform by progressive control in which the lighting fixture 100 according to the first embodiment emits light in all colors. In FIG. 2, the power supply circuit 31 is a switching power supply including an inductor, and power is supplied to the LED loads 21 to 24 via the inductor. The vertical axis in the figure shows the inductor current IL, that is, the current supplied from the power supply circuit 31 to any LED load. The horizontal axis shows time. The figure is an example of progressive control for emitting all colors (N = 4 colors). The cycle Tc is a cycle in which the four LED loads 21 to 24 are turned on once, and is divided into four time slots T1 to T4. The four time slots T1 to T4 are assigned one-to-one to the four LED loads 21 to 24. The triangular wave in the time slots T1 to T4 shows a current waveform fed from the inductor of the power supply circuit 31. Red, green, blue, and white LED loads 21 to 24 are assigned to the time slots T1 to T4, respectively. Since the period Tc is short enough for human vision, a mixed color of four colors appears to a person as one illumination light.

Subsequently, as an example of the illumination state by the first control, an example of emitting two colors out of four colors will be described.

FIG. 3A is a diagram showing an example of a current waveform under the first control of causing the lighting fixture 100 according to the first embodiment to emit two colors. The figure receives a toning instruction instructing that the two LED loads 21 and 22 corresponding to red and green are turned on and the two LED loads 23 and 24 corresponding to blue and white are not turned on. The lighting state by the first control at that time is shown. The period Tc and time slots T1 to T4 in the figure are the same as those in FIG. In FIG. 2, the LED loads 21 and 22 corresponding to red and green are arranged in the time slots T3 and T4 so that the time slots T3 and T4 assigned to the LED loads 23 and 24 corresponding to blue and white do not become empty time slots. Assigned.

In other words, the control circuit 33 performs the first control of causing the selector circuit 32 to select at least one LED load among the M LED loads in the plurality of time slots in the N time slots. In FIG. 3A, N = 4 and M = 2. The M LED loads are LED loads 21 and 22 corresponding to red and green. The at least one LED load described above is two LED loads 21 and 22 corresponding to red and green. The LED load 21 is selected in two time slots T1 and T3. The LED load 22 is selected in two time slots T2 and T4.

In FIG. 3A, there is no long turn-off section Toff as in FIG. 14B, and color flicker is less likely to occur. In FIG. 3A, the emission colors of the time slots T1 to T4 are red, green, red, and green. For example, red, green, green, and green may be used, or red, green, red, and red may be used. good.

Next, as an example of the illumination state by the second control, an example of emitting two colors out of four colors will be described.

FIG. 3B is a diagram showing an example of a second-controlled current waveform that causes the lighting fixture 100 according to the first embodiment to emit two colors. In the figure, the same case as in FIG. 3A, that is, the two LED loads 21 and 22 corresponding to red and green are turned on, and the two LED loads 23 and 24 corresponding to blue and white are not turned on. It shows the lighting state by the second control at the time of receiving the toning instruction to instruct that. The cycle Tc1 in the figure is a cycle in which the two LED loads 21 and 22 corresponding to red and green are turned on once, and is divided into time slots T1 and T2. The LED load 21 corresponding to red is assigned to the time slot T1, and the LED load 22 corresponding to green is assigned to the time slot T2.

In other words, the control circuit 33 has a second control in which the control circuit 33 sets M time slots in one cycle and causes the selector circuit 32 to cyclically select M LED loads in the M time slots. I do. In FIG. 3B, N = 4 and M = 2. The M LED loads are LED loads 21 and 22 corresponding to red and green.

In FIG. 3B, there is no long turn-off section Toff as in FIG. 14B, and color flicker is less likely to occur. The period Tc1 in FIG. 3B may be, for example, 1/2 of the period Tc in FIG. 3A.

Further, as an example of the illumination state by the second control, another example of emitting two colors out of four colors will be described.

FIG. 3C is a diagram showing another example of the current waveform by the second control in which the luminaire 100 according to the first embodiment emits two colors. In the figure, the same case as in FIG. 3A, that is, the two LED loads 21 and 22 corresponding to red and green are turned on, and the two LED loads 23 and 24 corresponding to blue and white are not turned on. It shows the lighting state by the second control at the time of receiving the toning instruction to instruct that. The cycle Tc2 in the figure is a cycle in which the two LED loads 21 and 22 corresponding to red and green are turned on once, and is divided into time slots T1 and T2. The LED load 21 corresponding to red is assigned to the time slot T1, and the LED load 22 corresponding to green is assigned to the time slot T2.

In other words, the control circuit 33 has a second control in which the control circuit 33 sets M time slots in one cycle and causes the selector circuit 32 to cyclically select M LED loads in the M time slots. I do. In FIG. 3C, N = 4 and M = 2. The M LED loads are LED loads 21 and 22 corresponding to red and green.

In FIG. 3C, there is no long turn-off section Toff as in FIG. 14B, and color flicker is less likely to occur. The period Tc2 in FIG. 3C may be the same as the period Tc in FIG. 3A, for example. Further, in FIGS. 3A to 3C, an example of two-color emission of red and green is shown, but other color combinations may be used.

Next, as an example of the illumination state by the first control, an example of emitting three colors out of four colors will be described. FIG. 4A is a diagram showing an example of a current waveform under the first control of causing the lighting fixture 100 according to the first embodiment to emit light in three colors. The figure receives a toning instruction instructing that the three LED loads 21, 22, and 24 corresponding to red, green, and white are turned on, and the one LED load 23 corresponding to blue is not turned on. The lighting state by the first control at that time is shown. The period Tc and time slots T1 to T4 in the figure are the same as those in FIG. In FIG. 4A, the LED load 24 corresponding to white is assigned to the time slot T3 so that the time slot T3 assigned to the LED load 23 corresponding to blue does not become an empty time slot.

In other words, the control circuit 33 performs the first control of causing the selector circuit 32 to select at least one LED load among the M LED loads in the plurality of time slots in the N time slots. In FIG. 4A, N = 4 and M = 3. The M LED loads are LED loads 21, 22, and 24 corresponding to red, green, and white. The at least one LED load described above is the LED load 24 corresponding to white. The LED load 24 is selected in two time slots T3 and T4.

In FIG. 4A, there is no long turn-off section Toff as in FIG. 14B, and color flicker is less likely to occur. In FIG. 4A, the emission colors of the time slots T1 to T4 are red, green, white, and white, but for example, red, green, red, and white may be used, or red, green, green, and white may be used. good.

Subsequently, as an example of the illumination state by the second control, an example of emitting three colors out of four colors will be described.

FIG. 4B is a diagram showing an example of a current waveform by the second control in which the lighting fixture 100 according to the first embodiment emits three colors. In the figure, the same case as in FIG. 4A, that is, the three LED loads 21, 22, and 24 corresponding to red, green, and white are turned on, and the one LED load 23 corresponding to blue is not turned on. It shows the lighting state by the second control at the time of receiving the toning instruction to instruct that. The cycle Tc2 in the figure is a cycle in which the three LED loads 21, 22, and 24 corresponding to red, green, and white are turned on once, and is divided into time slots T1 to T3. LED loads 21, 22, and 24 corresponding to red, green, and white are assigned to the time slots T1 to T3.

In other words, the control circuit 33 has a second control in which the control circuit 33 sets M time slots in one cycle and causes the selector circuit 32 to cyclically select M LED loads in the M time slots. I do. In FIG. 4B, N = 4 and M = 3. The M LED loads are LED loads 21, 22, and 24 corresponding to red, green, and white.

In FIG. 4B, there is no long turn-off section Toff as in FIG. 14B, and color flicker is less likely to occur. The period Tc2 in FIG. 4B may be, for example, 3/4 of the period Tc in FIG. 3A. Further, in FIGS. 4A and 4B, an example of three-color emission of red, green, and white is shown, but other color combinations may be used.

Next, a more specific circuit example of the lighting fixture 100 having the LED lighting device 30 will be described.

FIG. 5 is a diagram showing a circuit configuration example of a lighting fixture 100 having the LED lighting device 30 according to the first embodiment. As shown in the figure, the luminaire 100 includes a light source 20 and an LED lighting device 30. However, in FIG. 5, the AC-DC power supply 10 shown in FIG. 1 is omitted.

The LED load 21 in the light source 20 is connected in series with the switching element M3, and its lighting is controlled by turning on and off the switching element M3. The longer the on-time of the switching element M3, the larger the current flows through the LED load 21, and the larger the amount of light emitted.

As a specific circuit example, the LED load 21 of FIG. 5 is connected in series with LEDs d1 to d3, a smoothing capacitor C2 connected in parallel with LEDs d1 to d3, and a parallel circuit including LEDs d1 to d3 and a smoothing capacitor C2. It also has a diode Da for preventing backflow and a resistor R2 for discharging when the power is turned off.

LEDs d1 to d3 are LED light emitting elements having the same light emitting color connected in series, and are connected in series with the switching element M3.

The smoothing capacitor C2 smoothes the inductor current supplied from the inductor L10 via the diode Da.

The diode Da prevents the current from flowing back from the smoothing capacitor C2 to the inductor L10. That is, the diode Da supplies the electric charge charged in the smoothing capacitor C2 only to the LEDs d1 to d3.

The resistor R2 has a high resistance value and discharges the electric charge of the smoothing capacitor C2 after the power is turned off from the on state.

The LED loads 22 to 24 have a configuration similar to that of the LED load 21 except that the emission colors are different. The LED load 21 may not be provided with the smoothing capacitor C2 and the diode Da for preventing backflow. The same applies to the LED loads 22 to 24.

The power supply circuit 31 in the LED lighting device 30 shows an example of a step-down chopper circuit in FIG. Specifically, the power supply circuit 31 includes a regulator 34, an HVIC (High Voltage Integrated Circuit) 35, input resistors R6 and R7, switching elements M1 and M2, and an inductor L10.

The regulator 34 receives DC power from the AC-DC power supply 10 and supplies a stabilized power supply voltage to the HVIC 35 and the control circuit 33.

The HVIC 35 supplies a gate signal to the switching elements M1 and M2 via the input resistors R6 and R7 according to the control of the control circuit 33. The gate signals of the switching elements M1 and M2 are activated at high speed, periodically and exclusively.

The switching elements M1 and M2 are high-side transistors and low-side transistors for alternately connecting the DC voltage supplied from the AC-DC power supply 10 and the ground level to the inductor L10.

The inductor L10 stores and releases electrical energy according to the switching of the switching elements M1 and M2.

The selector circuit 32 includes input resistors R8 to R11 and switching elements M3 to M6.

The switching element M3 is connected in series with the LED load 21. A gate signal instructing on and off is input from the control circuit 33 to the gate of the switching element M3 via the input resistor R8. The switching element M3 is turned on and off according to the gate signal.

The switching elements M4 to M6 are also the same as the switching element M3.

The control circuit 33 may be configured by an MCU (Micro Controller Unit or Micro Computer Unit) including a processor, a memory, and a timer 36. The timer 36 measures various periodic times. For example, it is used to measure a cycle in which a plurality of LED loads 21 to 24 are selected.

[1.2 Operation of LED lighting device and lighting equipment]
Next, an operation example of the lighting fixture 100 including the LED lighting device 30 according to the first embodiment will be described.

First, an operation example when four out of four colors are emitted, that is, when all colors are emitted will be described.

FIG. 6 is a diagram showing a current waveform and a voltage waveform of each part by progressive control in which the lighting fixture 100 according to the first embodiment emits light in all colors. The horizontal axis in the figure is the time axis. The vertical axis shows the current or voltage of each part. The inductor current IL indicates a current flowing through the inductor L10, that is, a current supplied from the power supply circuit 31 to any LED load. This inductor current IL corresponds to FIG.

The gate voltage V0 indicates a voltage input from the control circuit 33 to the gate of the switching element M1 via the HVIC 35. When the gate voltage V0 is at a high level, the switching element M1 is turned on. The section where the gate voltage V0 is at a high level is equal to the section where the inductor current IL rises diagonally in the triangular wave. In the section where the gate voltage V0 is at a high level, the inductor current IL increases. At this time, the inductor L10 stores electric energy as magnetic energy. When the gate voltage V0 is at a low level, the switching element M1 is turned off. Immediately after the switching element M1 is switched from the on state to the off state, the inductor L10 releases the stored energy, that is, the inductor current IL is reduced to 0 by the back electromotive force of the inductor L10 and is supplied to the LED load 21. .. As a result, the inductor current IL becomes a triangular wave in the figure. The length of the base of the triangular wave is a feeding section in which electric power is supplied from the power supply circuit 31 to the LED load. The feeding section is longer than the high level section of the gate voltage V0. The power supply section in which the LED load is supplied from the power supply circuit 31 is equal to the section of one triangular wave.

The gate voltage Vr indicates a voltage input from the control circuit 33 to the gate of the switching element M3. When the gate voltage Vr is at a high level, the switching element M3 is turned on, that is, the corresponding LED load 21 is selected. Further, the high level section of the gate voltage Vr is controlled so as to include a high level section of the gate voltage V0 and include a triangular wave of the corresponding inductor current IL. The gate voltages Vg, Vb, and Vw are also the same as the gate voltage Vr. The pulse widths of the gate voltages Vr, Vg, Vb, and Vw are set so as to be equal to or greater than the width of the base of the triangular wave of the inductor current IL and less than the width of the time slot. Further, a dead time is provided between the high level sections of the gate voltages Vr, Vg, Vb, and Vw so that all four have low levels.

The LED current Ir indicates the current flowing through the LEDs d1 to d3 in the LED load 21. After the power supply section, that is, even after the power supply from the power supply circuit 31 to the LED load 21 is completed, the LED current Ir does not become 0 and continues to flow while the current decreases. This is due to the smoothing capacitor C2 and the backflow prevention diode Da.

The LED currents Ig, Ib, and Iw are the same as those of the LED current Ir.

As shown in FIG. 6, in the time slots T1 to T4, LED loads 21 to 24 corresponding to red, green, blue, and white are selected, respectively. In other words, the control circuit 33 sets periodic N time slots, and performs progressive control in which N LED loads are cyclically selected by the selector circuit 32 in the N time slots. Here, N = 4.

The toning for adjusting the color of the illumination light in the luminaire 100 is realized by changing the ratio of the brightness of the plurality of emission colors. Specifically, in FIG. 6, the control circuit 33 can adjust the color by changing the ratio of the four pulse widths of the gate voltages V0 of the time slots T1 to T4. Further, the dimming for adjusting the brightness of the illumination light in the luminaire 100 is realized by changing the brightness while keeping the ratio of the brightness of the plurality of emission colors constant. Specifically, in FIG. 6, the control circuit 33 adjusts by increasing or decreasing the four pulse widths of the gate voltage V0 while keeping the ratio of the four pulse widths of the gate voltage V0 of the time slots T1 to T4 constant. Can shine.

In the example shown in FIG. 6, the switching element M1 of the power supply circuit 31 is controlled to be turned on within the period in which any of the LED loads is selected by the selector circuit 32. That is, the switching operation in the power supply circuit 31 which is a switching power supply and the selection operation in the selector circuit 32 are synchronized.

Next, an operation example at the time of two-color emission by the first control will be described.

FIG. 7A is a diagram showing a current waveform and a voltage waveform of each part by the first control of causing the lighting fixture 100 according to the first embodiment to emit two colors. The inductor current IL of FIG. 7A corresponds to FIG. 3A. 7A is different from FIG. 6 in the gate voltage Vr to Vw and the LED current Ir to Iw. Hereinafter, the differences will be mainly described.

The gate voltage Vr is active not only in the time slot T1 but also in the time slot T3. As a result, the LED load 21 corresponding to red is selected twice within the period Tc.

The gate voltage Vg is active not only in the time slot T2 but also in the time slot T4. As a result, the LED load 22 corresponding to green is selected twice within the period Tc.

The gate voltages Vb and Vw are not active in any time slot. As a result, the LED load 23 corresponding to blue and white is never selected within the period Tc.

The LED current Ir peaks in the two time slots T1 and T3 based on the inductor current IL.

The LED current Ig peaks in the two time slots T2 and T4 based on the inductor current IL.

The LED currents Ib and Iw do not flow in any of the time slots.

Thus, in FIG. 7A, M (here, red and green) LED loads are turned on, and (NM) (here, blue and white) LED loads are turned on. When receiving a color matching instruction instructing not to turn on, the control circuit 33 applies a plurality of LED loads of at least one of M (here, red and green) LED loads in four time slots. The first control to make the selector circuit 32 select in the time slot of is performed.

Next, an operation example at the time of two-color emission by the second control will be described.

FIG. 7B is a diagram showing a current waveform and a voltage waveform of each part by the second control of causing the lighting fixture 100 according to the first embodiment to emit two colors. The inductor current IL of FIG. 7B corresponds to FIG. 3B. In FIG. 7B, each waveform is substantially the same as that in FIG. 7A as compared with FIG. 7A, and the configuration of the time slot is different. Hereinafter, the differences will be mainly described.

The period Tc1 corresponds to, for example, 1/2 of the period Tc in FIG. 7A. The period Tc1 is divided into T1 and T2 in two time slots.

Thus, in FIG. 7B, M (here, red and green) LED loads are turned on, and (NM) (here, blue and white) LED loads are turned on. Upon receiving a color matching instruction instructing not to light, the control circuit 33 sets periodic M time slots, and the M LED loads are cyclically applied to the selector circuit 32 in the M time slots. The second control to be selected is performed.

As described above, the LED lighting device 30 according to the first embodiment is an LED lighting device 30 that lights N LED loads 21 to 24 having an emission color of N (N is an integer of 2 or more). By selecting one LED load from the power supply circuit 31 that supplies power to the N LED loads 21 to 24 and the N LED loads 21 to 24, the power supply circuit 31 feeds the selected LED load. It is provided with a selector circuit 32 and a control circuit 33 that sets periodic N time slots and performs progressive control in which N LED loads are cyclically selected by the selector circuit 32 in the N time slots. When the control circuit 33 receives a toning instruction instructing that M (M is an integer smaller than N) LED loads be turned on and (NM) LED loads are not turned on, (i). ) Let the selector circuit 32 select M LED loads cyclically in N time slots, and let the selector circuit 32 select at least one of the M LED loads in a plurality of time slots. Either the first control or (ii) a second control in which M periodic time slots are set and M LED loads are cyclically selected by the selector circuit 32 in the M time slots. Do one.

According to this, it is possible to make it difficult to cause color flicker when there is a non-lighting color in the progressive lighting.

Here, the power supply circuit 31 is a switching power supply including the inductor L10, and may supply power to a plurality of LED loads 21 to 24 via the inductor L10.

According to this, it is possible to reduce the size, efficiency and cost of the power supply circuit 31.

Here, the control circuit 33 may synchronize the switching operation of the power supply circuit 31 with the selection operation in the selector circuit 32.

According to this, it is possible to further reduce the size, efficiency and cost of the power supply circuit 31.

Here, the control circuit 33 may perform the first control when receiving the above-mentioned color adjustment instruction.

According to this, it is possible to allow the presence of non-lit colors while maintaining the period and the number of divisions of the time slot.

Here, the control circuit 33 may perform the second control when the above-mentioned color adjustment instruction is received.

According to this, by changing the number of divisions of the time slot to M, the existence of the non-lighting color can be easily tolerated.

Further, the lighting fixture 100 according to the first embodiment includes an LED lighting device 30 and a plurality of LED loads 21 to 24.

Here, each of the plurality of LED loads is connected in series with one or more LEDs, a smoothing capacitor connected in parallel with the one or more LEDs, and a parallel circuit including the one or more LEDs and the smoothing capacitor. It may also have a backflow prevention diode.

The control circuit 33 may be configured to execute only one of (i) the first control and (ii) the second control, or the control circuit 33 may be configured to execute both of them. May be configured to execute alternatives.

(Embodiment 2)
Subsequently, the LED lighting device 30 and the lighting fixture 100 according to the second embodiment will be described.

In the present embodiment, in the lighting fixture 100 of the first embodiment, it is instructed that M (M is an integer smaller than N) LED loads are turned on and (NM) LED loads are not turned on. When receiving a color matching instruction, the brightness (luminous flux amount) is the same in (i) one of the first control and (ii) the second control, and (iii) the progressive control that allows the color not to be turned on. An example will be described.

[2.1 Configuration of LED lighting device and lighting equipment]
The configuration of the luminaire 100 according to the second embodiment may be the same as that of FIGS. 1 and 5. However, the control performed by the selector circuit 32 by the control circuit 33 is different. The differences will be mainly described below.

The control circuit 33 cyclically selects the M LED loads in the M time slots in the (iii) N time slots, and does not select any LED load in the NM time slots. The effective value of the current of each of the M LED loads assumed when the selector circuit 32 is controlled, and the M in the control of either (i) the first control or (ii) the second control. Make the effective value of the current of each LED load the same. For example, when the control circuit 33 receives a color matching instruction instructing that M (M is an integer smaller than N) LED loads be turned on and (NM) LED loads are not turned on. After the control of (iii) is performed, the control shifts to the control of (i) or (ii). In this case, the brightness controlled by (iii) can be made the same as the brightness controlled by (i) or (ii).

[2.2 Operation of LED lighting device and lighting equipment]
Next, an operation example of the lighting fixture 100 including the LED lighting device 30 according to the second embodiment will be described.

FIG. 8A is a diagram showing an example of a waveform of a current by progressive feed control including a non-lighting color according to the second embodiment. That is, FIG. 8A shows an example of the waveform of (iii) above, in which M (here, red and green) LED loads are turned on, and (NM) (here, blue and white) are turned on. Corresponds to the toning instruction instructing not to turn on the LED load of (2).

When the control circuit 33 receives the dimming instruction, the control circuit 33 calculates the current values L1 and Lav when the control of (iii) is temporarily performed or when it is assumed that the control of (iii) is performed. From (i) the first control or (ii) the second control is performed. The current value L1 in FIG. 8A is the peak value of the inductor current IL. The current value Lav is an effective value of the inductor current IL (here, an average value may be used). The control circuit 33 controls so that the effective value in (iii) and (i) the effective value in the first control or the second control are the same.

FIG. 8B is a diagram showing (i) an example of a waveform of a current under the first control corresponding to FIG. 8A. The current value L2 in FIG. 8B is the peak value of the inductor current IL. The current value Lav is an effective value (mean value) of the inductor current IL. The control circuit 33 (i) sets the peak value L2 in the first control so that the effective value Lav in FIG. 8B is the same as the effective value Lav in FIG. 8A. The peak value L2 is proportional to the pulse width of the gate voltage V0 shown in FIG. 7A. The control circuit 33 determines the pulse width of the gate voltage V0 corresponding to the effective value Lav and the peak value L2.

In FIGS. 8A and 8B, the effective value Lav, the peak value L1 and the peak value L2 are not only one type, but actually the current values Lav, L1 and L2 corresponding to red and the current values corresponding to green. Lav, L1 and L2 are handled individually.

FIG. 8C is a diagram showing an example of a waveform of the current by (ii) second control corresponding to FIG. 8A. FIG. 8C is the same as that of FIG. 8A except that the configuration of the time slot is different from that of FIG. 8B.

As described above, in the LED lighting device 30 according to the second embodiment, the control circuit 33 cyclically selects the M LED loads in the M time slots in the (iii) N time slots, and also , The effective value of each of the M LED loads assumed when the selector circuit 32 is controlled so that no LED load is selected in the NM time slots, and (i) the first control and (ii). ) Make the effective value of each of the M LED loads in the control of either one of the second controls the same.

According to this, the brightness (luminous flux amount) can be made the same between (iii) the progressive control and (i) the first control or (ii) the second control.

(Embodiment 3)
Subsequently, the LED lighting device 30 and the lighting fixture 100 according to the third embodiment will be described. In the third embodiment, an example in which the lighting fixture 100 of the second embodiment further provides a transition period between the progressive control of (iii) and the first control of (i) will be described.

[3.1 Configuration of LED lighting device and lighting equipment]
The configuration of the lighting fixture 100 according to the third embodiment may be the same as that in FIGS. 1 and 5. However, the control performed by the selector circuit 32 by the control circuit 33 is different. The differences will be mainly described below.

When the control circuit 33 receives a toning instruction instructing that M (M is an integer smaller than N) LED loads be turned on and (NM) LED loads are not turned on, (i). ) Temporarily perform the progressive control of (iii) before the first control. Further, the control circuit 33 provides a transition period from the end of the control of (iii) to the start of the first control (i). In the transition period, the control circuit 33 keeps the effective value of each of the M LED loads the same, and keeps the intermediate state between the illumination state by the progressive control of (iii) and the illumination state by the first control (i). Is controlled to generate at least one. Thereby, the transition from the illumination state by the progressive control of (iii) to the illumination state by the first control can be smoothed.

[3.2 Operation of LED lighting device and lighting equipment]
Next, an operation example of the lighting fixture 100 including the LED lighting device 30 according to the third embodiment will be described.

FIG. 9 is a diagram showing an example of current waveforms in the progressive control, the transition period, and the first control according to the third embodiment. FIG. 9A is the same as FIG. 8A showing the waveform by progressive control. FIG. 9C is the same as FIG. 8B showing the waveform by the first control. FIG. 9B shows an example of a waveform in the intermediate state of the transition period, and represents the intermediate state that changes stepwise. The number of intermediate states may be at least one, and may be, for example, three or four.

In FIG. 9B, the control circuit 33 gradually reduces the peak value of the inductor current IL from L1 to L2 in the lighting time slots T1 and T2. The control circuit 33 gradually increases the peak value of the inductor current IL from 0 to L2 in the non-lit time slots T3 and T4. Further, the control circuit 33 controls so as to keep the effective value (mean value) Lav of the inductor current IL constant in (b) and (c).

The effective value Lav, peak value L1 and peak value L2 are not limited to one type, but the current values Lav, L1 and L2 corresponding to red and the current values Lav, L1 and L2 corresponding to green are individually handled. ..

As described above, in the LED lighting device 30 according to the third embodiment, the control circuit 33 temporarily controls (iii) before (i) the first control, and from the end of the control of (iii). (I) A transition period until the start of the first control is provided, and the effective value of each of the M LED loads is the same during the transition period, while the lighting state under the control of (iii) and the lighting state under the first control. Control to generate at least one intermediate state between and.

According to this, the brightness (luminous flux amount) can be made the same by the progressive control of (iii) and the first control (i), and the brightness (luminous flux amount) can be smoothly changed from (iii) to (i).

(Embodiment 4)
Subsequently, the LED lighting device 30 and the lighting fixture 100 according to the fourth embodiment will be described. In the fourth embodiment, an example in which the lighting fixture 100 of the second embodiment further provides a transition period between the progressive control of (iii) and the second control of (ii) will be described.

[4.1 Configuration of LED lighting device and lighting equipment]
The configuration of the luminaire 100 according to the fourth embodiment may be the same as that of FIGS. 1 and 5. However, the control performed by the selector circuit 32 by the control circuit 33 is different. The differences will be mainly described below.

When the control circuit 33 receives a toning instruction instructing that M (M is an integer smaller than N) LED loads be turned on and (NM) LED loads are not turned on, (ii). ) Temporarily perform the progressive control of (iii) before the second control. Further, the control circuit 33 provides a transition period from the end of the control of (iii) to the start of the second control (ii). During the transition period, the control circuit 33 sets an intermediate state between the illumination state by the progressive control of (iii) and the illumination state by the second control while making the effective value of the current of each of the M LED loads the same. Control to generate at least one. Thereby, the transition from the illumination state by the progressive control of (iii) to the illumination state by the second control of (iii) can be smoothed.

[4.2 Operation of LED lighting device and lighting equipment]
Next, an operation example of the lighting fixture 100 including the LED lighting device 30 according to the fourth embodiment will be described.

FIG. 10 is a diagram showing an example of current waveforms in the progressive control, the transition period, and the second control according to the fourth embodiment. FIG. 10A is the same as FIG. 8A showing the waveform by progressive control. FIG. 10 (c) is almost the same as FIG. 3C showing the waveform by the second control. FIG. 10B shows an example of a waveform in the intermediate state of the transition period, and represents the intermediate state that changes stepwise. The number of intermediate states may be at least one, and may be, for example, three or four.

In FIG. 10B, the control circuit 33 gradually reduces the peak value of the inductor current IL from L1 to L2 in the lighting time slots T1 and T2. At the same time, the control circuit 33 gradually reduces the time width of each time slot to 0 in the non-lit time slots T3 and T4. The control circuit 33 controls so as to keep the effective value (mean value) Lav of the inductor current IL constant in (b) and (c).

The effective value Lav, peak value L1 and peak value L2 are not limited to one type, but the current values Lav, L1 and L2 corresponding to red and the current values Lav, L1 and L2 corresponding to green are individually handled. ..

As described above, in the LED lighting device 30 according to the fourth embodiment, the control circuit 33 temporarily controls (iii) before the second control (iii), and from the end of the control of (iii). (Ii) A transition period until the start of the second control is provided, and in the transition period, the time of (NM) time slots in the N time slots is the time of N times in the control of (iii). Control is performed to generate at least one intermediate state that gradually becomes shorter than the slot time.

According to this, the brightness (luminous flux amount) is the same between the progressive control of (iii) and the second control of (ii), and the transition from (iii) to (ii) makes the human eye feel uncomfortable. Can be smoothed without giving.

(Embodiment 5)
Subsequently, the LED lighting device 30 and the lighting fixture 100 according to the fifth embodiment will be described. In the fifth embodiment, as compared with the fourth embodiment, (ii) the cycle Tc in the second control is made the same as the cycle Tc in the progressive control of (iii), the time width of the time slot is lengthened, and the power supply is supplied. An example of lengthening the power supply section from the circuit 31 to the LED load will be described. Here, the feeding section from the power supply circuit 31 to the LED load corresponds to the length of the base of the triangular wave in the inductor current IL of FIGS. 3A to 3C and the like.

[5.1 Configuration of LED lighting device and lighting equipment]
The configuration of the luminaire 100 according to the fifth embodiment may be the same as that of FIGS. 1 and 5. However, the control performed by the selector circuit 32 by the control circuit 33 is different. The differences will be mainly described below.

When the control circuit 33 receives a toning instruction instructing that M (M is an integer smaller than N) LED loads be turned on and (NM) LED loads are not turned on, (ii). ) Temporarily perform the progressive control of (iii) before the second control. Further, the control circuit 33 provides a transition period from the end of the control of (iii) to the start of the second control (ii). During the transition period, the control circuit 33 sets the intermediate state between the illumination state by the progressive control of (iii) and the illumination state by the second control to at least 1 while making the effective value of each of the M LED loads the same. Control to generate one.

The control circuit 33 makes the period Tc consisting of M time slots in the second control (ii) the same as the period Tc consisting of N time slots in the progressive control of (iii). As a result, the time of each of the M time slots becomes longer than the time of each of the N time slots. At the same time, the control circuit 33 makes the feeding time of each of the M time slots longer than the corresponding feeding time of the N time slots in the progressive control of (iii) in the second control.

[5.2 Operation of LED lighting device and lighting equipment]
Next, an operation example of the lighting fixture 100 including the LED lighting device 30 according to the fifth embodiment will be described.

FIG. 11 is a diagram showing an example of current waveforms in the progressive control, the transition period, and the second control according to the fifth embodiment. FIG. 11A is the same as FIG. 8A showing the waveform by progressive control. FIG. 11 (c) is the same as FIG. 8C showing the waveform by the second control. FIG. 11B shows an example of a waveform in the intermediate state of the transition period, and represents the intermediate state that changes stepwise. The number of intermediate states may be at least one, and may be, for example, three or four.

In FIG. 11B, the control circuit 33 gradually reduces the peak value of the inductor current IL from L1 to L2 and gradually lengthens the feeding time in the lighting time slots T1 and T2. .. At the same time, the control circuit 33 gradually increases the time width of each of the lighting time slots T1 and T2 to Tc / 2. Further, the control circuit 33 gradually reduces the time width of each time slot to 0 in the non-lighting time slots T3 and T4. At this time, the control circuit 33 controls so as to keep the effective value (mean value) Lav of the inductor current IL constant in (b) and (c) of FIG.

In FIGS. 11B and 11C, in order to reduce the peak value of the inductor current IL, lengthen the feeding time, and keep the effective value (mean value) Lav constant, the control circuit 33 is an inductor. It is necessary to reduce the slope of the diagonal rise in the triangular wave of the current IL. In order to reduce the inclination, the control circuit 33 may reduce the power supply voltage of the power supply circuit 31, or may configure the inductor L10 with a variable inductor to increase the inductance value.

Further, the effective value Lav, the peak value L1 and the peak value L2 are not limited to one type, but the current values Lav, L1 and L2 corresponding to red and the current values Lav, L1 and L2 corresponding to green are individually handled. ..

According to this, the brightness (luminous flux amount) is the same between the progressive control of (iii) and the second control of (ii), and the transition from (iii) to (ii) makes the human eye feel uncomfortable. Can be smoothed without giving.

As described above, in the LED lighting device 30 according to the fifth embodiment, the control circuit 33 has (ii) a cycle consisting of M time slots in the second control and N time slots in the control of (iii). It is made the same as the period Tc consisting of, and (ii) the feeding time of each of the M time slots in the second control is made longer than the corresponding feeding time of the N time slots in the control of (iii).

Here, the control circuit 33 may make the power supply voltage from the power supply circuit in the M time slots in the second control (ii) smaller than the power supply voltage in the N time slots in the control (iii). good.

According to this, the control circuit 33 can easily keep the effective value (mean value) of the feeding current constant in the control of (iii) and the second control of (iii).

Here, the control circuit 33 temporarily performs the control of (iii) before the second control of (ii), and the transition period from the end of the control of (iii) to the start of the second control (ii). During the transition period, (ii) the power supply voltage from the power supply circuit in the M time slots in the second control is gradually smaller than the power supply voltage in the N time slots in the control (iii). The transition may be made through at least one intermediate state.

Here, the control circuit 33 gradually makes the time of each of the M time slots longer than the time of each of the N time slots in at least one intermediate state, and at the same time, in the M time slots. The power supply time from the power supply circuit is gradually made longer than the power supply time in the N time slots in the control of (iii), and in at least one intermediate state, there are NM time slots in the N time slots. The time may be gradually shorter than the time of N time slots in the control of iii.

According to this, the brightness (luminous flux amount) is the same between the progressive control of (iii) and the second control of (ii), and the transition from (iii) to (ii) makes the human eye feel uncomfortable. Can be smoothed without giving.

The period Tc and the period Tc1 may be periodic at a speed that cannot be perceived by humans. For example, the frequency, which is the reciprocal of the period Tc that lights up once, may be 100 Hz or higher.

Here, "periodically at a speed that humans cannot perceive" means "do not allow humans to perceive flicker." Regarding measures against flicker of LED lighting, for example, "Regarding the enforcement of the revised government ordinance of the Electrical Appliance and Material Safety Law (enforced from July 1, 2012)" (Ministry of Economy, Trade and Industry), which is an explanatory document of the Electrical Appliance and Material Safety Law (PSE). The standards are shown in (according to the Product Safety Division of the Commercial Distribution Group). In "Countermeasures against flicker of optical output" on page 28 of the same explanatory document, the frequencies that bring about the effect equivalent to "the optical output does not feel flicker" are interpreted as follows. That is, in the same explanatory document, "the optical output does not feel flicker" is satisfied by (1) the repetition frequency is 100 Hz or more and there is no missing part in the optical output, and (2) the repetition frequency is 500 Hz. As mentioned above, it is interpreted as one of the above.

In the lighting fixture 100 of the present embodiment, since it is considered that there is no omission in the light output in the examples of FIGS. 6, 7A and 7B, it is considered that the above (1) may be satisfied. In this case, the frequency, which is the reciprocal of the one-round lighting cycle, may be 100 Hz or higher.

Further, although the examples of N = 4 and M = 2 have been described in each embodiment, N may be other than 4, and M may be other than 2. Although the example of two-color emission of red and green has been described as an example of M = 2, other color combinations may be used.

(Embodiment 6)
In the sixth embodiment, an example of the lighting fixture 100 including the LED lighting device 30 according to each of the above embodiments will be described with reference to FIGS. 12A to 12C.

FIG. 12A is a diagram showing an external example of a lighting fixture 100 having an LED lighting device 30 according to each embodiment. FIG. 12A shows the appearance of the downlight 100a as an example of the lighting fixture 100.

The downlight 100a includes a circuit box 101a, a lamp body 102a, and a wiring 103a. The circuit box 101a is a housing for accommodating all or a part of the LED lighting device 30 according to each of the above embodiments. The lamp body 102a is a lamp body equipped with a light source 20. The wiring 103a electrically connects the circuit box 101a and the light source 20 in the lamp body 102a.

FIG. 12B is a diagram showing another appearance example of the luminaire 100 having the LED lighting device 30 according to each embodiment. FIG. 12B shows the appearance of the spotlight 100b as an example of the lighting fixture 100.

The spotlight 100b includes a circuit box 101b, a lamp body 102b, and wiring 103b. The circuit box 101b, the lamp body 102b, and the wiring 103b are the same as the circuit box 101a, the lamp body 102a, and the wiring 103a of FIG. 12A.

FIG. 12C is a diagram showing still another appearance example of the luminaire 100 having the LED lighting device 30 according to each embodiment. FIG. 12C shows the appearance of the spotlight 100c as an example of the lighting fixture 100.

The spotlight 100c includes a circuit box 101c and a lamp body 102c. These are also the same as the circuit box 101a and the lamp body 102b in FIG. 12A.

Also in the sixth embodiment, the same effect as that of each of the above-mentioned embodiments can be obtained.

The LEDs d1 to d12 in the light source 20 may be not only a so-called light emitting diode but also a solid light emitting element such as an organic EL light emitting diode (OLED: Organic Light Emitting Diode) or a laser light emitting device.

Although the LED lighting device 30 and the luminaire 100 according to the present invention have been described above based on the embodiments, the present invention is not limited to the embodiments. As long as the gist of the present invention is not deviated, various modifications that can be conceived by those skilled in the art are applied to the present embodiment, and other embodiments constructed by arbitrarily combining some components in the embodiments and modifications are also available. , Included within the scope of the present invention.

21, 22, 23, 24 LED load 30 LED lighting device 31 Power supply circuit 32 Selector circuit 33 Control circuit 36 Timer 100 Lighting equipment C2, C3, C4, C5 Smoothing capacitors d1 to d12 LED
Da, Db, Dc, Dd Diode L10 Inductor M3, M4, M5, M6 Switching element

Claims (14)

It is an LED lighting device that lights an N LED (Light Emitting Diode) load having an emission color of N (N is an integer of 2 or more).
A power supply circuit that supplies power to the N LED loads, and
A selector circuit that feeds the selected LED load from the power supply circuit by selecting one LED load from the N LED loads, and a selector circuit.
It is provided with a control circuit for setting periodic N time slots and performing progressive control in which the N LED loads are cyclically selected by the selector circuit in the N time slots.
The control circuit is
When receiving a toning instruction instructing that M (M is an integer smaller than N) LED loads are turned on and (NM) LED loads are not turned on.
(I) The M LED loads are cyclically selected by the selector circuit in the N time slots, and at least one of the M LED loads is selected in the plurality of time slots. The first control to let the selector circuit select, and
(Ii) An LED that performs either one of a second control in which M periodic time slots are set and the M LED load is cyclically selected by the selector circuit in the M time slots. Lighting device. The LED lighting device according to claim 1, wherein the power supply circuit is a switching power supply including an inductor, and supplies power to the plurality of LED loads via the inductor. The LED lighting device according to claim 2, wherein the control circuit synchronizes a switching operation of the power supply circuit with a selection operation of the selector circuit. The LED lighting device according to any one of claims 1 to 3, wherein the control circuit performs the first control when the color matching instruction is received. The LED lighting device according to any one of claims 1 to 3, wherein the control circuit performs the second control when the color matching instruction is received. The control circuit cyclically selects the M LED loads in the M time slots in the N time slots (iii), and any of the M LED loads in the (NM) time slots. Assuming that the selector circuit is controlled so that the LED load is not selected,
The effective value of the current of each of the M LED loads in the assumed control of (iii) and the effective value of the current of each of the M LED loads in the control of either the first control or the second control. The LED lighting device according to any one of claims 1 to 5, which has the same value. The control circuit is
Before the first control, the control of (iii) is temporarily performed.
A transition period from the end of the control of (iii) to the start of the first control is provided.
A control that generates at least one intermediate state between the lighting state under the control of (iii) and the lighting state under the first control while making the effective value of each of the M LED loads the same during the transition period. The LED lighting device according to claim 6. The control circuit is
Before the second control, the control of (iii) is temporarily performed.
A transition period from the end of the control of (iii) to the start of the second control is provided.
In the transition period, an intermediate state in which the time of the (NM) time slots in the N time slots is gradually shorter than the time of the N time slots in the control of the (iii). The LED lighting device according to claim 6, wherein at least one LED lighting device is controlled to generate. The control circuit is
The cycle consisting of M time slots in the second control is made the same as the cycle consisting of N time slots in the control (iii).
The LED lighting device according to claim 6, wherein the feeding time of each of the M time slots in the second control is made longer than the corresponding feeding time of the N time slots in the control of (iii). The control circuit is
The LED lighting device according to claim 9, wherein the power supply voltage from the power supply circuit in the M time slots in the second control is smaller than the power supply voltage in the N time slots in the control of (iii). The control circuit is
Before the second control, the control of (iii) is temporarily performed.
A transition period is provided from the end of the control of (iii) to the start of the second control.
During the transition period, the feed voltage from the power supply circuit in the M time slots in the second control is gradually smaller than the feed voltage in the N time slots in the control (iii), at least 1. The LED lighting device according to claim 9 or 10, wherein the LED lighting device is transferred through two intermediate states. The control circuit is
In the at least one intermediate state, the time of each of the M time slots is gradually made longer than the time of each of the N time slots, and at the same time, the power supply time from the power supply circuit in the M time slots is increased. Is gradually made longer than the power supply time in the N time slots in the control of (iii).
Claims to gradually reduce the time of (NM) time slots in the N time slots to the time of N time slots in the control of (iii) in the at least one intermediate state. Item 11. The LED lighting device according to item 11. The LED lighting device according to any one of claims 1 to 12, and the LED lighting device.
A lighting fixture including the plurality of LED loads. Each of the plurality of LED loads
With one or more LEDs
A smoothing capacitor connected in parallel with one or more LEDs,
The luminaire according to claim 13, further comprising a parallel circuit including the one or more LEDs and the smoothing capacitor and a backflow prevention diode connected in series.

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