TWI725301B - Lighting fixtures - Google Patents

Abstract

The present invention provides a lighting appliance that can use a low-cost power supply circuit to reproduce colors with light colors close to the black body locus. The lighting fixture of the present invention includes: a light-emitting module 100 having a plurality of light-emitting parts 110 whose light colors are different from each other; and a power supply circuit 200 that outputs power to the light-emitting module 100 to make the light-emitting module 100 emit light And a plurality of light-emitting parts 110, including: a first light-emitting part 111; a second light-emitting part 112, which emits light with a lower color temperature than the light emitted by the first light-emitting part 111; and a third light-emitting part 113, which emits a color temperature The light having a lower color temperature than the light emitted by the second light-emitting part 112; the number of output strands of the power supplied from the power supply circuit 200 to the light-emitting module 100 is less than the number of the light-emitting parts 110; The brightness of the light-emitting module 100 when only the third light-emitting portion 113 of the 110 emits light is 5% or less.

Description

Lighting fixtures

The present invention relates to a lighting appliance.

In the past, there has been known a lighting fixture that has a function (a so-called toning function) that can change the light color of the illuminating light in accordance with the purpose of use, usage conditions, and the like (for example, refer to Patent Document 1).

A conventional lighting appliance with a color adjustment function, for example, has: a light-emitting module having two light-emitting parts with different light colors; and a power supply circuit that can independently control the amount of light emitted by the two light-emitting parts of the light-emitting module. In these lighting fixtures, the light output ratio of the two light-emitting parts can be controlled by a power supply circuit, so that the lighting light can be toned. [Related Technical Documents] [Patent Documents]

Patent Document 1: Japanese Patent Laid-Open No. 2009-110781

[Problems to be solved by the present invention]

However, if two light-emitting parts with different light colors are used to color the illuminating light, the color can only be adjusted on the straight line connecting the two chromaticity points on the chromaticity diagram. For example, when the luminous colors of the two light-emitting parts are natural white and incandescent lamp color, only a straight line connecting the two points on the chromaticity diagram between the chromaticity point representing natural white and the chromaticity point representing the color of the incandescent lamp The upper chromaticity changes the light color of the illuminating light.

Therefore, the two light-emitting parts with different light colors produce a color shift between the black body locus, and it is impossible to change the light color of the illumination light by tracking the black body locus, and it is difficult to reproduce the white color that satisfies the entire range of the black body locus. Light.

Therefore, it is also considered to use three light-emitting parts with different light colors to color the illuminating light. However, if the light output of the three light-emitting parts is independently controlled by a power supply circuit, the power supply circuit becomes complicated and the cost of the power supply circuit becomes high.

The present invention is proposed in order to solve these problems, and its purpose is to provide a lighting fixture that can use a low-cost power supply circuit to reproduce colors with light colors close to the black body locus. [Technical means to solve the problem]

In order to achieve the above object, one aspect of the lighting fixture of the present invention includes: a light-emitting module having a plurality of light-emitting parts whose light colors are different from each other; and a power supply circuit that outputs to the light-emitting module for the The power for the light-emitting module to emit light; the plurality of light-emitting parts are provided with: a first light-emitting part; a second light-emitting part that emits light with a lower color temperature than the light emitted by the first light-emitting part; and a third light-emitting part, Emit light whose color temperature is lower than that of the light emitted by the second light-emitting part; the number of output strands of the power supplied from the power circuit to the light-emitting module is less than the number of the plurality of light-emitting parts; The brightness of the light-emitting module when only the third light-emitting part emits light among the light-emitting parts is 5% or less. [Effects of the invention]

According to the present invention, a low-cost power supply circuit can be used to perform color reproduction with a light color close to the black body locus.

Hereinafter, the embodiments of the present invention will be described. In addition, the embodiments described below all show a preferred specific example of the present invention. Therefore, the numerical values, shapes, materials, structural elements, and the arrangement positions and connection forms of the structural elements shown in the following embodiments are all examples, and they are not intended to limit the present invention. Therefore, among the constituent elements of the following embodiments, the constituent elements that are not described in the independent claims showing the highest concept of the present invention will be described as arbitrary constituent elements.

In addition, the drawings are schematic diagrams, not strictly illustrations. Therefore, the scales in the drawings do not have to be consistent. In the drawings, the same symbols are given to substantially the same components, and repeated descriptions are omitted or simplified.

(Embodiment) First, the configuration of the lighting fixture 1 of the embodiment will be described with reference to Figs. 1 to 3. Fig. 1 is a schematic diagram of an installation example of the lighting fixture 1 of the embodiment. FIG. 2 is a diagram showing the circuit configuration of the same lighting fixture 1. FIG. 3 is a diagram showing the structure of the light emitting module 100 of the same lighting fixture 1.

As shown in FIG. 1, the lighting fixture 1 of this embodiment is a downlight that irradiates illuminating light downward (floor, etc.), and is installed on the ceiling 2 of a building. For example, the lighting fixture 1 is inserted into the ceiling 2 and arranged.

As shown in FIG. 1, the lighting fixture 1 includes a lamp unit 10 having a light emitting module 100 and a power supply unit 20 having a power supply circuit 200. For example, the lamp unit 10 is inserted into the opening 2a of the ceiling 2 and arranged, and the power supply unit 20 is arranged on the back of the ceiling 2 (ceiling inner surface). The opening 2a of the ceiling 2 is an installation hole for attaching the lamp unit 10 to the ceiling 2, for example, a through hole that penetrates the circular opening of the ceiling 2.

The lamp unit 10 includes, for example, a base 11 and a frame 12 fixed to the front of the base 11. The light emitting module 100 is installed on the base 11. The base 11 is made of, for example, a metal material such as aluminum, and not only functions as a mounting part of the light-emitting module 100, but also functions as a heat dissipation part for dissipating heat generated in the light-emitting module 100. The frame 12 is attached to the opening 2a of the ceiling 2 by a leaf spring or the like.

The light emitting module 100 emits illuminating light of a predetermined color. For example, the light emitting module 100 emits white light as illuminating light. As shown in FIG. 2, the light-emitting module 100 includes a plurality of light-emitting parts 110 that emit light of a predetermined color. In addition, in this embodiment, the light-emitting module 100 is an LED module; the light source, that is, the light-emitting portion 110, is composed of LEDs.

The light-emitting module 100 includes a plurality of light-emitting parts 110 whose light colors are different from each other. There are three or more light emitting parts 110. In this embodiment, the light-emitting module 100 is composed of the following three light-emitting parts 110: the first light-emitting part 111 emits light of a first color temperature; the second light-emitting part 112 emits light compared to the light emitted by the first light-emitting part 111 The color temperature of the light (the first color temperature) is lower, that is, the light of the second color temperature; and the third light-emitting portion 113 emits a color temperature lower than the color temperature of the light emitted by the second light-emitting portion 112 (the second color temperature). That is the light of the third color temperature.

As an example, the first light-emitting part 111 emits white light with a color temperature of 6200K (first color temperature); and the second light-emitting part 112 emits white light with a color temperature of 2200K (second color temperature). In addition, the light color of the third light-emitting part 113 is, for example, red or amber. In this embodiment, the third light-emitting portion 113 emits red monochromatic light with a peak wavelength in the range of 620 nm to 700 nm, and its color temperature (third color temperature) is about 1800K.

The first light emitting section 111 is composed of a plurality of LED elements 111a (first LED elements) connected in series. Specifically, the first light-emitting portion 111 is a series connection body in which six LED elements 111a are connected in series. The six LED elements 111a have the same configuration and characteristics (IF-VF characteristics, etc.). Therefore, the color temperature of the light of the six LED elements 111a is 6200K. In addition, the number of LED elements 111a constituting the first light-emitting portion 111 is not limited to six, and may be one or plural other than six.

The second light emitting section 112 is composed of a plurality of LED elements 112a (second LED elements) connected in series. Specifically, the second light emitting unit 112 is a series connection body in which five LED elements 112a are connected in series. The five LED elements 112a have the same configuration and characteristics (IF-VF characteristics, etc.). Therefore, the color temperature of the light of the five LED elements 112a is 2200K. In addition, the number of LED elements 112a constituting the second light-emitting portion 112 is not limited to five, and may be one or plural other than five.

The third light-emitting portion 113 is composed of a plurality of LED elements 113a (third LED elements) connected in series. Specifically, the third light-emitting portion 113 is a series connection body in which two LED elements 113a are connected in series. The two LED elements 113a have the same configuration and characteristics (IF-VF characteristics, etc.). Therefore, the light color of the light of the two LED elements 113a is red with a color temperature of about 1800K. In addition, the number of LED elements 113a constituting the third light-emitting portion 113 is not limited to two, and may be one or plural other than two.

The first light-emitting portion 111, the second light-emitting portion 112, and the third light-emitting portion 113 are provided on different current paths. That is, the LED element 111a constituting the first light emitting unit 111, the LED element 112a constituting the second light emitting unit 112, and the LED element 113a constituting the third light emitting unit 113 are not connected in series. In this embodiment, the LED element 112a constituting the second light-emitting portion 112 and the LED element 113a constituting the third light-emitting portion 113 are connected in parallel.

In addition, assuming that the total forward voltage of the plurality of LED elements connected in series in each light-emitting section 110 is the total Vf (total Vf), the value of the total Vf of the element rows of each light-emitting section 110 in this embodiment is It depends on the number of LED elements in each light-emitting part 110. Therefore, if the total Vf of the first light-emitting portion 111 composed of six LED elements 111a is set to TVf1, the total Vf of the second light-emitting portion 112 composed of five LED elements 112a is set to TVf2, and the total Vf of the second light emitting portion 112 composed of five LED elements 112a is set to TVf2. The total Vf of the third light-emitting portion 113 configured is TVf3, which becomes TVf1>TVf2>TVf3.

The light-emitting module 100 further includes a current control circuit 120 in addition to the light-emitting portion 110 (the first light-emitting portion 111, the second light-emitting portion 112, and the third light-emitting portion 113).

The current control circuit 120 compares the light-emitting parts connected to the current control circuit 120 among the light-emitting parts 110 of the light-emitting module 100 based on the current output ratio depending on the amount of current supplied from the power supply circuit 200 to the current control circuit 120 110 supplies current. The current control circuit 120 includes a current detection circuit, and detects the amount of current supplied from the power supply circuit 200 to the current control circuit 120.

In this embodiment, the current control circuit 120 is connected to the second light emitting unit 112 and the third light emitting unit 113, and distributes and supplies the input current supplied to the current control circuit 120 to the second light emitting unit 112 and the third light emitting unit 113. In this case, the current control circuit 120 detects the current amount (current value) of the input current input from the power supply circuit 200 to the current control circuit 120. Then, according to the detected current amount, the current output ratio (distribution ratio) for the input current distributed to the second light-emitting part 112 and the third light-emitting part 113 is determined, and the current control circuit 120 is based on the current output ratio. The amount of current divides the current to the second light-emitting part 112 and the third light-emitting part 113.

In addition, the current control circuit 120, when shunting current to the plurality of light emitting parts 110 connected to the current control circuit 120, prioritizes the current to the light emitting parts 110 connected to the current control circuit 120. The total amount of forward voltage is small The light-emitting part 110 circulates. Therefore, the current control circuit 120 causes the current to flow from the light-emitting part 110 where the total forward voltage is small, and if the amount of current supplied from the power supply circuit 200 to the current control circuit 120 gradually increases, the current is also sent to the other light-emitting parts 110 Diversion.

In this embodiment, the second light-emitting portion 112 and the third light-emitting portion 113 are connected to the current control circuit 120, and the total forward voltage of the third light-emitting portion 113 is smaller than that of the second light-emitting portion 112. Therefore, the current control circuit 120 first causes the current to flow only to the third light-emitting section 113 whose total forward voltage is smaller than that of the second light-emitting section 112, and follows the current supplied from the power supply circuit 200 to the current control circuit 120. The larger the amount, the larger the amount of current shunted to the third light-emitting portion 113. Then, if the amount of current supplied from the power supply circuit 200 to the current control circuit 120 is further increased, and the current flowing in the third light-emitting part 113 becomes the maximum, the current control circuit 120 also causes the current to flow to the second light-emitting part 112. The amount of current shunted to the second light-emitting portion 112 is increased.

The light emitting module 100 configured in this way has, for example, the structure shown in FIG. 3. Specifically, the light-emitting module 100 includes a substrate 130; a plurality of light-emitting parts 110 (a first light-emitting part 111, a second light-emitting part 112, and a third light-emitting part 113) and a current control circuit 120 are provided on the substrate 130.

In this embodiment, the third light-emitting portion 113 is arranged at the center of the substrate 130. Specifically, the two LEDs 113 a constituting the third light-emitting portion 113 are arranged side by side in the center portion of the substrate 130.

In addition, the second light-emitting portion 112 is divided into a plurality of pieces, and the third light-emitting portion 113 is arranged between one and the other of the plurality of second light-emitting portions 112. Specifically, the LED element 112a constituting the second light-emitting portion 112 is divided into two areas and arranged via the third light-emitting portion (LED element 113a); the LED element 113a constituting the third light-emitting portion 113 is arranged on one side Between the LED element 112a of one area and the LED element 112a arrange|positioned in the other area.

In addition, the first light-emitting portion 111 is arranged between the second light-emitting portion 112 and the third light-emitting portion 113. Specifically, the LED element 111a constituting the first light emitting unit 111 is arranged between the LED element 112a constituting the second light emitting unit 112 and the LED element 113a constituting the third light emitting unit 113.

By arranging the first light-emitting portion 111, the second light-emitting portion 112, and the third light-emitting portion 113 in this way, it is possible to emit light from the first light-emitting portion 111, the second light-emitting portion 112, and the third light-emitting portion 113, respectively. The light mixes evenly. In particular, when the first light-emitting portion 111, the second light-emitting portion 112, and the third light-emitting portion 113 are controlled in a synchronized manner as described later, the first light-emitting portion 111, the second light-emitting portion 112, and the third light-emitting portion The part 113 causes one or more of them to emit light, but the colors can be mixed uniformly in any brightness.

In this embodiment, the LED element 111a constituting the first light-emitting portion 111, the LED element 112a constituting the second light-emitting portion 112, and the LED element 113a constituting the third light-emitting portion 113 are individually packaged and surface mounted (SMD: Surface Mount Device) type LED components.

Specifically, the LED elements 111a, 112a, and 113a each have: a package (container) made of white resin with a recess; one or more LED chips (bare chips) are mounted on the bottom surface of the recess of the package at a time; And the sealing member is enclosed in the recess of the package. The sealing member is made of, for example, a translucent resin material such as silicone resin.

The LED chip is an example of a semiconductor light-emitting element that emits light with a predetermined DC power, and is a bare chip that emits monochromatic visible light. In this case, the LED chips of the LED elements 111a and 112a are, for example, blue LED chips that emit blue light when energized, and have a peak wavelength in the range of 440 nm to 470 nm, for example. In the LED elements 111a and 112a, in order to obtain white light, the sealing member contains a yellow phosphor such as YAG (yttrium aluminum garnet), and the blue light from the blue LED chip is used as excitation light to emit fluorescent light. In the LED elements 111a and 112a, the yellow phosphor absorbs part of the blue light of the blue LED chip, excites the yellow phosphor and emits yellow light from the yellow phosphor. This yellow light and the blue that the yellow phosphor does not absorb The color light is mixed to produce white light.

However, the first light-emitting portion 111 emits light having a higher color temperature than the light emitted by the second light-emitting portion 112. Therefore, in order to make the color temperature of the light emitted by the first light-emitting portion 111 higher than the color temperature of the light emitted by the second light-emitting portion 112, the type of phosphor contained in the sealing member (for example, red phosphor, The chromaticity adjustment of the first light-emitting portion 111 and the second light-emitting portion 112 is performed with respect to the green phosphor and the blue phosphor).

On the other hand, the LED chip of the LED element 113a is a red LED chip that emits red light when energized, and has a peak wavelength in the range of 620 nm to 700 nm, for example. The LED element 113a directly takes out the red light of the red LED chip, so the sealing member does not include a phosphor.

The LED elements 111a, 112a, and 113a configured in this way are mounted on the substrate 130 by soldering, for example.

In addition, the current control circuit 120 is configured as an IC package with a plurality of lead terminals, and is mounted on the substrate 130 by welding, for example.

The substrate 130 is a printed wiring substrate on which metal wiring (not shown) is formed, and a predetermined pattern of metal wiring is formed on the surface of the substrate 130. The LED elements 111a, 112a, and 113a, and the current control circuit 120 are soldered to the metal wiring formed on the substrate 130. The LED elements 111a, 112a, and 113a and the current control circuit 120 are electrically connected with the circuit structure shown in FIG. 2 by such metal wiring.

As the substrate 130, for example, a resin substrate made of an insulating resin material, a metal base substrate made of a metal material whose surface is coated with a resin film, a ceramic substrate made of a sintered ceramic material, or a glass substrate made of a glass material Wait. In addition, when the wiring path between the LED elements 111a, 112a, and 113a and the current control circuit 120 becomes complicated, by using a multi-layer substrate as the substrate 130, electrical connection thereof can be easily performed.

In addition, the substrate 130 is not limited to a rigid substrate, but may also be a flexible substrate. In addition, a photoresist film may be formed as an insulating film on the surface of the substrate 130 to cover the metal wiring.

In addition, a plurality of input terminals 131 are provided on the substrate 130, and the input terminals 131 are electrically connected to the wires 30 derived from the power supply circuit 200. In this embodiment, the plural input terminals 131 are composed of a first input terminal 131a, a second input terminal 131b, and a third input terminal 131c.

The current (input current) input from the power supply circuit 200 to the light emitting module 100 passes through two of the first input terminal 131a and the second input terminal 131b. On the other hand, the current (output current) output from the light-emitting module 100 to the power supply circuit 200 passes through the third input terminal 131c.

Returning to FIG. 1, the power supply unit 20 includes: a housing 21; a circuit board 22 housed in the housing 21; a plurality of circuit elements 23 mounted on the circuit board 22; and a terminal block 24 that receives an AC power source 3 (for example, commercial Power supply) AC power. The housing 21 is a case made of metal or insulating resin. The circuit board 22 is a printed wiring board on which metal wiring is formed. The terminal block 24 receives, for example, an AC voltage of AC100V as an input voltage. The AC voltage received by the terminal block 24 is supplied to the power supply circuit 200.

The power supply circuit 200 is composed of a plurality of circuit elements 23. The plurality of circuit elements 23 are, for example, capacitive elements (electrolytic capacitors, ceramic capacitors, etc.), resistive elements (resistors, etc.), rectifier circuit elements, coil elements, transformers, noise filters, diodes, integrated circuit elements ( IC), or semiconductor components (FET, etc.), etc.

The power supply circuit 200 generates power for causing the light-emitting module 100 to emit light according to an input voltage from an external power source, and outputs the generated power to the light-emitting module 100. In addition, the power supply circuit 200 has a power supply function for generating power for causing the light-emitting module 100 to emit light, and has a lighting control function for controlling the lighting state of the light-emitting module 100. Specifically, the power supply circuit 200, as a lighting control function, has a dimming function to change the brightness of the illuminating light of the light-emitting module 100 and a toning function to change the light color of the illuminating light of the light-emitting module 100.

In this embodiment, the power supply circuit 200 has a synchronous toning function, so that the brightness and light color of the light-emitting module 100 can be changed in conjunction. For example, if the brightness of the light-emitting module 100 increases, it changes to light with a high color temperature, and if the brightness of the light-emitting module 100 decreases, it changes to a light with a low color temperature. In this way, it is possible to realize the change into the illuminating light of the brightness and light color that is pleasant for people.

In this case, the synchronous color adjustment of the light-emitting module 100 can be controlled by the dimmer switch 4. The dimmer switch 4 is provided, for example, on a wall surface or the like, and is provided on a wiring path between the AC power supply 3 and the power supply circuit 200 (terminal block 24). The dimmer switch 4 is, for example, a phase-controlled dimmer (two-wire dimmer) that controls the phase of the AC voltage. In this case, by controlling the phase angle (conduction angle) of the AC voltage supplied from the AC power source 3 with the dimmer switch 4, the input current to the light-emitting module 100 is changed. Specifically, the power supply circuit 200 generates an input current that depends on the AC voltage controlled by the dimming switch 4. In this way, the brightness of the light-emitting module 100 can be adjusted by the dimmer switch 4, and the light color of the light-emitting module 100 can also be adjusted. In addition, the dimmer switch 4 is provided with an operation part such as a slider or a knob that can be operated by the user, and controls the phase angle (conduction angle) in accordance with the operation of the operation part performed by the user.

In this embodiment, the power supply circuit 200 is a dual-circuit control power supply, which serves as power for making the light-emitting portion 110 of the light-emitting module 100 emit light, and outputs two input powers to the light-emitting module 100. Specifically, the power supply circuit 200 outputs two input powers to the light-emitting module 100 including the three light-emitting units 110 of the first light-emitting unit 111, the second light-emitting unit 112, and the third light-emitting unit 113. In this way, the number of output strands of the power supplied from the power supply circuit 200 to the light-emitting module 100 is smaller than the number of the light-emitting parts 110 (three in this embodiment). That is, the number of power supply circuits of the power supply circuit 200 is less than the number of light-emitting colors of the light-emitting portion 110 (ie, the number of light-source colors).

The two input powers output from the power circuit 200 to the light-emitting module 100 can be independently controlled by the power circuit 200. Specifically, from the power supply circuit 200, two DC powers independently controlled as a driving current for causing the light-emitting portion 110 of the light-emitting module 100 to emit light are supplied to the light-emitting module 100 as an input current. In this embodiment, the two input currents output from the power supply circuit 200 to the light emitting module 100 are supplied to the first light emitting part 111 and the other to the current control circuit 120.

The power supply unit 20 and the lamp unit 10 are connected by a wire 30. Therefore, the DC power generated by the power circuit 200 of the power supply unit 20 is supplied to the light-emitting module 100 of the lamp unit 10 via the wire 30. Specifically, the power circuit 200 generates a current that reflects the dimming control performed by the dimmer switch 4, and uses the generated current as the input current to the light-emitting module 100, and supplies the light-emitting module 100 from the power circuit 200 through the wire 30 . In addition, the electric wire 30 is a power line such as a power supply line.

In this embodiment, the power supply circuit 200 outputs DC power to the first light-emitting unit 111 and the current control circuit 120, so the electric wire 30 is a total of three power lines as follows: the input current from the power supply circuit 200 to the light-emitting module 100 flows 2 power lines, and 1 power line through which the output current from the light-emitting module 100 to the power supply circuit 200 flows.

Next, using FIGS. 4 to 7E, the color adjustment control of the lighting fixture 1 of the embodiment will be described in comparison with the color adjustment control of the lighting fixture 1X of the comparative example. Fig. 4 is a diagram showing the circuit configuration of the lighting fixture 1X of the comparative example. FIG. 5 is an xy chromaticity diagram showing the light color change of the illuminating light caused by the color adjustment control of the luminaire 1 of the embodiment and the luminaire 1X of the comparative example. FIG. 6 is a graph showing the relationship between color temperature and brightness in the color adjustment control of the lighting fixture 1 of the embodiment. 7A to 7E are diagrams showing the flow of current when the color adjustment control of the lighting fixture 1 of the embodiment is performed.

As shown in FIG. 4, the lighting fixture 1X of Comparative Example 1 includes: a light-emitting module 100X having a first light-emitting portion 111 that emits light with a color temperature of 6200K and a second light-emitting portion 112 that emits light with a color temperature of 2200K; and a power supply Circuit 200. In the lighting fixture 1X of the comparative example, the power supply circuit 200 controls the light output ratio of the first light-emitting portion 111 and the second light-emitting portion 112, so that the luminous light of the lighting fixture 1X can be toned.

However, the lighting fixture 1X comparative example, the broken line shown in FIG. 5, only the corresponding to the chromaticity point P of 6200K to 2200K corresponding to color point P of the straight line connecting the two points _X5 and toned ₁ . That is, only on the straight line can chromaticity chromaticity point and the chromaticity points P ₁ P _X5 connecting the two points, and changing the color temperature of the illumination light.

Therefore, the lighting fixture 1 of the comparative example has a color shift between the blackbody locus shown in the curve of FIG. 5, and the color temperature of the illumination light cannot be changed by tracking the blackbody locus, and it is difficult to reproduce the white light that satisfies the entire range of the blackbody locus.

In contrast, the light-emitting module 100 of the luminaire 1 of this embodiment is provided with a first light-emitting portion 111 that emits light with a color temperature of 6200K and a second light-emitting portion 112 that emits light with a color temperature of 2200K. The third light emitting part 113 of red light. Then, two input currents are supplied from the power supply circuit 200 to the light emitting module 100, one of which is supplied to the first light emitting part 111, and the other is supplied to the current control circuit 120. Furthermore, the current control circuit 120 distributes and supplies the input current to the second light-emitting portion 112 and the third light-emitting portion 113 in accordance with the current amount of the other input current.

In addition, in this embodiment, the light-emitting module 100 is controlled by the power supply circuit 200 in synchronization. Specifically, as shown in FIG. 6, control makes the brightness of the light-emitting module decrease as the color temperature of the light-emitting module 100 becomes lower, and conversely, controls so that the light-emitting module 100 becomes higher as the color temperature of the light-emitting module 100 becomes higher. The brightness of group 100 becomes larger.

Specifically, current is supplied to the first light-emitting portion 111, the second light-emitting portion 112, and the third light-emitting portion 113 so as to be aligned with the chromaticity points P ₁ , P ₂ , P ₃ , P ₄ , and P _{5 of FIG. 5} The straight line connecting each point corresponds to the light output ratio shown in Table 1 below, and the color temperature and brightness of the illumination light of the light emitting module 100 are changed. In addition, the chromaticity points P ₁ , P ₂ , P ₃ , P ₄ , and P ₅ represent the chromaticity coordinates of the xy chromaticity diagram in FIG. 5.

【Table 1】

Hereinafter, the synchronous toning control of this embodiment will be described in detail.

First, in this embodiment, when only the first light-emitting portion 111 with a color temperature of 6200K emits light with the maximum brightness (corresponding to the chromaticity point P ₁ in FIG. 5 ), it is the maximum brightness of the light-emitting module 100. In addition, the brightness of the light-emitting module at this time is set to 115%. In addition, the color temperature of the light emitting module 100 when the brightness of the light emitting module 100 is 100% is set to 2700K.

When the brightness of the light-emitting module 100 is 115% (maximum), as shown in FIG. 7A, the power supply circuit 200 only outputs the first input current I _IN1 to the light-emitting module 100. _{In this case, the first input current I IN1} supplied to the light-emitting module 100 is supplied only to the first light-emitting part 111 as the driving current I _L1. Thereby, only the first light-emitting part 111 in the light-emitting module 100 emits light, and the light-emitting module 100 emits illuminating light with a color temperature of 6200K.

In addition, as shown in FIG. 6, when the color temperature of the light-emitting module 100 is 2700K-6200K (area A), the brightness of the light-emitting module 100 changes in the range of 100%-115%. Specifically, in this area A, color adjustment/dimming control is performed to linearly change the brightness of the light-emitting module 100.

In this case, as shown in FIGS. 7B and 7C, the power supply circuit 200 outputs _{two input currents, the first input current I IN1} and the second input current I _IN2 , to the light-emitting module 100.

Among them, the first input current I _{IN1 is} supplied as the drive current I _{L1 to} only the first light-emitting section 111 to cause the first light-emitting section 111 to emit light. On the other hand, the second input current I _{IN2 is} supplied to the current control circuit 120.

At this time, the current control circuit 120, in accordance with the second amount of current to the input current I _IN2, the second input current I _IN2 is supplied to the third light-emitting unit 113 assigned second light emitting portion 112 and the second, in the present embodiment, the current control circuit 120. The current is preferentially flowed to the light-emitting portion 110 having a small total forward voltage among the plurality of light-emitting portions 110 connected to the current control circuit 120.

Therefore, in the case of the toning control in the area A of FIG. 6, as shown in FIG. 7B, the current control circuit 120 makes _{the total forward voltage of the second input current I IN2} smaller than that of the second light emitting section 112. The third light emitting unit 113 starts to circulate. That is, the second input current I _{IN2 is} directly supplied as the driving current I _L3 to only the third light-emitting part 113, and no current is supplied to the second light-emitting part 112. Thereby, the third light-emitting portion 113 is caused to emit light, and the second light-emitting portion 112 does not emit light.

Thereafter, if the ratio of the second input current I _IN2 is gradually greater than that of the first input current I _{IN1 , the driving current I L3} flowing through the third light-emitting part 113 will also gradually increase. If the second input current I _IN2 reaches _{The maximum current (chromaticity point P 3} ) flowing through the third light-emitting portion 113 is shown in FIG. 7C. The current control circuit 120 _{also shunts the second input current I IN2} to the second light-emitting portion 112. That is, the second input current I _IN2, is split into a driving current 112 of the second light emitting portion I _L2, I _L3 and the drive current to the light emitting portion 113 of the third.

In this way, when the color temperature is 2700K～6200K (area A), the first light-emitting part 111, the second light-emitting part 112, and the third light-emitting part 113 are controlled by the first input current I _IN1 and The second input current I _{IN2 is} independently controlled to emit light. According to the ratio of the light output of the first light emitting section 111, the second light emitting section 112, and the third light emitting section 113, the chromaticity point P ₁ and the chromaticity point of FIG. P ₃ The straight line connecting these two points performs color control. That is, the light-emitting module 100 emits illumination light with a color temperature of 6200K-2700K.

In addition, when color temperature control is performed at a color temperature of 2700K to 6200K (area A), in this embodiment, although the second light-emitting portion 112 is not made to emit light, it is also possible to control the second light-emitting portion 112 to also emit light.

In addition, as shown in FIG. 6, when the color temperature of the light-emitting module 100 is 2200K-2700K (domain B), the brightness of the light-emitting module 100 changes in the range of 5%-100%. Specifically, in this area B, color adjustment/dimming control is performed to change the brightness of the light-emitting module 100 in a curve shape (for example, a quadratic function).

In this case, as shown in FIG. 7C, the power supply circuit 200 outputs _{two input currents, the first input current I IN1} and the second input current I _IN2 , to the light-emitting module 100.

Among them, the first input current I _{IN1 is} supplied as the drive current I _{L1 to} only the first light-emitting section 111 to cause the first light-emitting section 111 to emit light. On the other hand, the second input current I _{IN2 is} supplied to the current control circuit 120. A current control circuit 120, in accordance with the second amount of current to the input current I _IN2, the second input current I _IN2 is supplied to the third light-emitting unit 113 assigned second light emitting portion 112 and the second, in the present embodiment, the current control circuit 120, so that The current preferentially flows to the light-emitting portion 110 having a small total forward voltage among the plurality of light-emitting portions 110 connected to the current control circuit 120.

Therefore, in the case of the color adjustment control in the area B of FIG. 6, as shown in FIG. 7C, the current control circuit 120 supplies the driving current I _L2 to the second light-emitting portion 112 and also to the third light-emitting portion. 113 supplies drive current I _L3 . In this embodiment, the chromaticity points are P ₃ to P _{5 , and as the driving current I L1} supplied to the first light-emitting part 111 _{decreases, the driving current I L2} supplied to the second light-emitting part 112 increases. Then, the chromaticity points P _4, the driving current supplied to the first light emitting portion 111 I _L1 becomes zero.

In this way, with regard to the case of performing toning control at a color temperature of 2200K to 2700K (area B), the first light-emitting portion 111, the second light-emitting portion 112, and the third light-emitting portion 113 also use the first input current I _IN1 and the second input current I _IN2 independently controlled to emit light, in accordance with the first light emitting portion 111, the second light-emitting portion 112, the second light emitting section 3 ratio of 113, FIG. 5 along the chromaticity of the color point of P ₃ The degree point P ₄ performs color adjustment on the straight line connecting these two points. That is, the light-emitting module 100 emits illuminating light with a color temperature of 2700K-2200K.

In addition, as shown in FIG. 6, when the color temperature of the light-emitting module 100 is 1800K-2200K (domain C), the brightness of the light-emitting module 100 changes within a range of 5% or less. Specifically, in this area C, color adjustment/dimming control is performed to change the brightness of the light-emitting module 100 in a curve shape.

In this case, as shown in FIG. 7D, the power supply circuit 200 does not output the first input current I _IN1 to the light emitting module 100, but only outputs the second input current I _IN2 . _{The second input current I IN2} supplied to the light-emitting module 100 is supplied to the current control circuit 120.

At this time, the current control circuit 120, in accordance with the second amount of current to the input current I _IN2, the second input current I _IN2 is supplied to the third light-emitting unit 113 assigned second light emitting portion 112 and the second, in the present embodiment, the current control circuit 120. The current is preferentially flowed to the light-emitting portion 110 having a small total forward voltage among the plurality of light-emitting portions 110 connected to the current control circuit 120.

Therefore, in the case of the color adjustment control in the area C of FIG. 6, as shown in FIG. 7D, the current control circuit 120 supplies the driving current I _L2 to the second light-emitting portion 112 and also to the third light-emitting portion in the same manner as described above. 113 supplies the driving current I _L3 , but the total forward voltage of the third light-emitting part 113 is smaller than that of the second light-emitting part 112, so the driving current I _L3 supplied to the third light-emitting part 113 is compared with that of the first light-emitting part 112. _{2 The driving current I L2} supplied by the light emitting unit 112 is also always large.

In this embodiment, when the chromaticity points are P ₄ to P ₅ , the control is controlled so that the driving current I _L2 supplied to the second light-emitting portion 112 is gradually reduced. Then, the chromaticity points P _5, the driving current I _L2 is supplied to the second light-emitting portion 112 becomes zero, the drive current I _L3 is supplied only to the third light emitting portion 113.

In this way, when the color temperature is 1800K～2200K (area C), the first light-emitting part 111 does not emit light, and only the second light-emitting part 112 and the third light-emitting part 113 use the second input current I _IN2 independently controlled to emit light, carried out along a straight line to the toner control chromaticity point and the chromaticity point P ₄ P ₅ connecting the two points according to the light emitting portion 112 than the second and third light emitting portion 113. That is, the light-emitting module 100 emits illuminating light with a color temperature of 2200K to 1800K.

In addition, as shown in FIG. 6, when the color temperature of the light-emitting module 100 is 1800K, the brightness of the light-emitting module 100 becomes 1%. At this time, the brightness of the light-emitting module 100 becomes the smallest.

In this case, as shown in FIG. 7E, the power supply circuit 200 does not output the first input current I _IN1 to the light emitting module 100, but only outputs the second input current I _IN2 . _{The second input current I IN2} supplied to the light-emitting module 100 is supplied to the current control circuit 120. A current control circuit 120, in accordance with the second amount of current to the input current I _IN2, the second current I _IN2 supplied to the input 112 and the second light emitting portion 113 assigned 3 second light emitting portion, but in the minimum brightness of FIG. 6 (1% ) In the case of color adjustment control, the _{entire second input current I IN2 is} supplied as the drive current I _{L3 to} only the third light-emitting part 113. Thereby, only the third light-emitting part 113 in the light-emitting module 100 emits light, and the light-emitting module 100 emits red light with a color temperature of 1800K.

As described above, in the lighting fixture 1 of this embodiment, as shown by the solid line in FIG. 5, when the color temperature is controlled from a high color temperature to a low color temperature, the chromaticity points P ₃ to P _{5 are} relatively moved to the third The amount of current flowing in the light emitting unit 113 gradually increases. Therefore, in the lighting fixture 1X of Comparative Example 1, the color temperature is 2200K and the chromaticity point is P _X5 , but in the lighting fixture 1 of this embodiment, the color temperature can be set to 2200K and the chromaticity point is P ₄ , and the color temperature can be 2200K. The chromaticity point moves _{from P X5} to P _4. Therefore, the chromaticity of the illumination light of the lighting fixture 1 can be made close to the target chromaticity of the blackbody locus. That is, the third light-emitting portion 113 can shift the color deviation (Duv) of the illumination light of the lighting fixture 1 (light-emitting module 100) on the low color temperature side to the negative side. In this way, the color temperature of the illumination light on the low color temperature side can be made close to the black body locus. As a result, the white light that satisfies the entire range of the black body locus can be reproduced.

In addition, in the lighting fixture 1 of this embodiment, the current control circuit 120 provided in the light-emitting module 100 outputs a current in accordance with the current amount of _{the second input current I IN2 supplied from the power supply circuit 200 to the current control circuit 120} Instead, the second input current I _IN2 is distributed and supplied to the second light-emitting portion 112 and the third light-emitting portion 113. In this way, although the three light-emitting parts 110 of the first light-emitting part 111, the second light-emitting part 112, and the third light-emitting part 113 are used, the number of input currents (the number of outputs) that can be independently controlled by the power supply circuit 200 is The two strands that are fewer than the number of light-emitting parts 110 can still change the color temperature of the illumination light by tracking the black body trajectory. That is, as the power supply circuit 200, an existing two-circuit control power supply with a low-cost and simple structure can be used to perform color adjustment control of the light-emitting module 100 having three light-emitting parts 110 with different light colors.

Therefore, according to the lighting fixture 1 of the present embodiment, the low-cost power supply circuit 200 can be used to perform color reproduction with a light color close to a black body locus.

Furthermore, in the lighting fixture 1 of the present embodiment, the brightness of the light-emitting module 100 when only the third light-emitting portion 113 of the plurality of light-emitting portions 110 emits light is 5% or less. Specifically, the brightness of the light-emitting module 100 when only the third light-emitting portion 113 emits light is 1%.

In this way, in this embodiment, in the process of synchronized toning, in order to emit light with low color temperature and brightness, and atmosphere, in the area C of FIG. 6 (the low color temperature area with a color temperature of 2200K or less), a complementary color circuit is used Only the second input current I _{IN2 is} supplied to the third light-emitting portion 113 and only the third light-emitting portion 113 is turned on, thereby emitting low-beam red light. In this way, the low-cost power supply circuit 200 is used to perform synchronous color adjustment to make the light color variable, and to achieve the color tone in the low color temperature range in a natural manner. In addition, the brightness of the light-emitting module 100 when only the third light-emitting portion 113 emits light is 5% or less, so that atmospheric light unique to a small light bulb can be realized.

In particular, in this embodiment, the third light-emitting portion 113 is arranged at the center of the substrate 130, so a light source that mimics the atmosphere of a small light bulb can be more realized.

(Modifications) As mentioned above, although the lighting fixture of this invention was demonstrated based on embodiment, this invention is not limited to the said embodiment.

For example, in the above-mentioned Embodiments 1 to 3, the dimming control of the plurality of light-emitting parts is performed by phase dimming (two-wire type), but the dimming control method is not limited to this method, and can also be controlled by PWM Dimming (four-wire type) or 0-10VDC dimming, etc. implement dimming control of multiple light-emitting parts.

In addition, in the above-mentioned embodiment, although the LED element constituting the light-emitting unit 110 is of the SMD type and the light-emitting module 100 is of the SMD type, it is not limited to this form. For example, a COB (Chip On Board) type light emitting module in which the LED chip (bare chip) is directly mounted on the substrate can also be used. For example, like the light-emitting module 101 shown in FIG. 8, the first light-emitting portion 111, the second light-emitting portion 112, and the third light-emitting portion 113 may be mounted on a plurality of LED chips on the substrate 130 and these LEDs The chip seal is composed of a sealing member. In this case, in the first light-emitting part 111 and the second light-emitting part 112, a blue LED chip is used as the LED chip, and a phosphor containing resin containing one or more kinds of phosphors such as yellow phosphor is used as the sealing member . On the other hand, in the third light emitting section 113, a red LED chip is used as the LED chip, and a transparent resin containing no phosphor is used as a sealing member. In addition, in Embodiments 2 and 3, COB-type light-emitting modules can also be applied.

In addition, in the above-mentioned embodiment, although the number of light-emitting parts provided in the light-emitting module is three, it is not limited to this form. For example, it is also possible to provide three or more light emitting parts in the light emitting module. In this case, the number of output strands of the power supplied from the power supply circuit to the light-emitting module is smaller than the number of light-emitting parts, compared to a power source with the same number of output strands and the number of light-emitting parts. The condition of the circuit can further suppress the cost of the power supply circuit.

In addition, in the above-mentioned embodiment, although the dimmer switch 4 connected to the power supply unit via a wire is used to perform the color adjustment control of the light-emitting module, it is not limited to this form. For example, it is also possible to build a wireless module in the power supply unit first, and send a dimming/color adjustment signal from the wireless terminal to the wireless module, so as to implement the color control of the light-emitting module.

In addition, in the above-mentioned embodiment, while the toning is controlled, the synchronized toning is performed in conjunction with the toning and the light adjustment, but it is not limited to this mode. For example, it is also possible to perform toning control that does not change the brightness but only changes the light color.

In addition, although the downlight is exemplified in the above embodiment, the present invention can also be applied to other lighting fixtures such as spotlights or basic lighting.

In addition, the above-mentioned embodiments are obtained by applying various modifications that are considered by those skilled in the art, and are realized by arbitrarily combining the constituent elements and functions of the embodiments without departing from the scope of the present invention. , Also included in the present invention.

1. 1X‧‧‧Lighting equipment 10‧‧‧Lighting unit 100, 100X, 101‧‧‧Light-emitting module 11‧‧‧Base 110‧‧‧Light-emitting part 111‧‧‧First light-emitting part 111a, 112a, 113a ‧‧‧LED element 112‧‧‧Second light emitting part 113‧‧‧3rd light emitting part 120‧‧‧Current control circuit 130‧‧‧Board 131‧‧‧Input terminal 131a‧‧‧First input terminal 131b‧‧ ‧The second input terminal 131c‧‧‧The third input terminal 2‧‧‧Ceiling 2a‧‧‧Opening 20‧‧‧Power unit 200‧‧‧Power circuit 21‧‧‧Chassis 22‧‧‧Circuit board 23‧ ‧‧Circuit components 24‧‧‧Terminal block 3‧‧‧AC power supply 30‧‧‧Wire 4‧‧‧Dimming switch I _IN1 ‧‧‧The first input current I _IN2 ‧‧‧The second input current I _L1 , I _L2 、I _L3 ‧‧‧Drive current

Fig. 1 is a schematic diagram of an installation example of the lighting fixture of the embodiment. Fig. 2 is a diagram showing the circuit configuration of the lighting fixture of the embodiment. Fig. 3 is a diagram showing the configuration of the light emitting module of the lighting fixture of the embodiment. FIG. 4 is a diagram showing the circuit configuration of the lighting fixture of Comparative Example 1. FIG. FIG. 5 is an xy chromaticity diagram showing the light color change of the illuminating light generated by the color adjustment control of the luminaire of the embodiment and the luminaire of Comparative Example 1. FIG. Fig. 6 is a diagram showing the relationship between color temperature and brightness in the color adjustment control of the lighting appliance according to the embodiment. FIG. 7A is a diagram showing the flow of electric current when the color adjustment control of the lighting apparatus of the embodiment (the color adjustment control at the maximum brightness of FIG. 6) is performed. FIG. 7B is a diagram showing the flow of electric current when the color adjustment control of the lighting apparatus of the embodiment (the color adjustment control in the area A of FIG. 6) is performed. FIG. 7C is a diagram showing the flow of electric current when the color adjustment control of the lighting apparatus of the embodiment (the color adjustment control in the area B of FIG. 6) is performed. FIG. 7D is a diagram showing the flow of electric current when the color adjustment control of the lighting apparatus of the embodiment (the color adjustment control in the area C of FIG. 6) is performed. Fig. 7E is a diagram showing the flow of electric current when the color adjustment control of the lighting apparatus of the embodiment (the color adjustment control at the minimum brightness of Fig. 6) is performed. FIG. 8 is a diagram showing the structure of a light-emitting module of a modified example.

1‧‧‧Lighting

100‧‧‧Lighting Module

110‧‧‧Lighting part

111‧‧‧First light-emitting part

111a, 112a, 113a‧‧‧LED components

112‧‧‧The second light-emitting part

113‧‧‧The third light-emitting part

120‧‧‧Current control circuit

131a‧‧‧The first input terminal

131b‧‧‧2nd input terminal

131c‧‧‧3rd input terminal

200‧‧‧Power circuit

3‧‧‧AC power supply

30‧‧‧Wire

4‧‧‧Dimming switch

Claims (7)

A lighting appliance includes: a light emitting module having a plurality of light emitting parts whose light colors of the emitted light are different from each other; and a power supply circuit that outputs power to the light emitting module to make the light emitting module emit light; the plurality of light emitting Part, including: a first light-emitting part; a second light-emitting part that emits light with a lower color temperature than the light emitted by the first light-emitting part; and a third light-emitting part that emits light with a color temperature lower than that of the second light-emitting part Light with a lower color temperature; the number of output strands of the power supplied from the power circuit to the light-emitting module is less than the number of the plurality of light-emitting parts; when only the third light-emitting part of the plurality of light-emitting parts emits light The brightness of the light-emitting module is less than 5%. For example, the lighting appliance of the first item of the scope of patent application, which further includes a current control circuit that supplies current to the second light-emitting part and the third light-emitting part; the current control circuit depends on the current from the power supply circuit The current output ratio of the amount of current supplied by the circuit is controlled, and the input current supplied to the current control circuit is distributed and supplied to the second light-emitting portion and the third light-emitting portion. For example, the lighting appliance of item 2 of the scope of patent application, wherein the current control circuit is provided in the light-emitting module. For example, the lighting appliance of any one of items 1 to 3 in the scope of patent application, in which, The light color of the third light-emitting part is red or amber. For example, the lighting appliance of any one of the first to third items in the scope of patent application, wherein the light-emitting module includes a substrate; and the third light-emitting part is arranged at the center of the substrate. For example, the lighting appliance of item 5 of the scope of patent application, wherein the second light-emitting part is divided into a plurality of pieces; the third light-emitting part is arranged between one of the plurality of second light-emitting parts and the other. For example, the luminaire of item 6 of the scope of patent application, wherein the first light-emitting part is arranged between the second light-emitting part and the third light-emitting part.

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