KR20180011036A - Lighting apparatus - Google Patents

Abstract

An improved lighting apparatus is disclosed. The lighting apparatus comprises a direct current power source part, a light emitting part and a voltage control part. The light emitting part is operated by receiving a direct current voltage applied from the direct current power source part and comprises a first light emitting group and a second light emitting group, which are connected in parallel. The first light emitting group has a first color temperature and is turned at a first turned-on voltage (VB) or more, and the second light emitting group has a second color temperature and is turned on at a second turned-on voltage (VA) higher than the first turned-on voltage. The voltage control part is positioned between the direct current power source part and the light emitting part to control the magnitude of a voltage applied from the direct current power source part to the light emitting part. The voltage control part includes at least one variable resistance and allows the second light emitting group to emit light or not by controlling the magnitude of the voltage applied to the light emitting part, thereby implementing a specific color temperature at a previously set ratio.

Description

LIGHTING APPARATUS

More specifically, the present invention relates to a lighting apparatus, and more particularly, to a lighting apparatus in which, during operation of a light emitting unit that emits warm white light, a light emitting unit that emits cool white light is controlled to emit light only by adjusting a voltage using a voltage regulating unit in a circuit, To a lighting apparatus in which a non-light-emitting section of light-emitting sections can be minimized in a lighting apparatus.

In addition to the lighting function, which is a basic function of the lighting device, the lighting device implemented by the light emitting diode also realizes emotional lighting for producing a unique atmosphere. The white light of a lighting device can be classified into a warm white which gives a warm feeling according to the color temperature (Correlated Color Temparature: CCT) and a cool white which gives a cold feeling. White light of color temperature 3000K or less is often called worm white, but white light of 5000K or more is called "cool white" although there is some error according to the classification standard. As shown in FIG. 1, a light emitting unit (a light emitting unit 1, a light emitting unit 2, a light emitting unit 3, and a light emitting unit 4) for emitting warm white light is required to switch between warm white and cool white, 10 and the light emitting units 2 and 20 for emitting cool white light are arranged at the same time so that the light emitting unit 1 10 or the light emitting unit 2 alone emits light to adjust the color temperature of the light. 1 is a prior art example in which the connection with the DC power supply unit 1 is controlled using switches S1 and S2 as required.

 However, this method is disadvantageous in that it is costly and inefficient because the entire light-emitting portion is not used and only some light-emitting portions 10 or 20 are used for light emission of warm white light or cool white light. Therefore, there is a need in the art for a method to overcome such shortcomings.

Korean Patent No. 10-1347718 (Dec. 27, 2013) Korean Patent No. 10-1095506 (Dec. 12, 2011)

The present invention provides a conventional lighting apparatus that simultaneously arranges a light emitting unit that emits warm white light and a light emitting unit that emits cool white light and adjusts the color temperature of the light by emitting only a part of them if necessary, It is an object of the present invention to provide an improved illumination device capable of solving a disadvantageous disadvantage.

According to an aspect of the present invention, there is provided an illumination device comprising: a direct current power source; a direct current power source that operates by receiving a direct current voltage from the direct current power source and is turned on at a first color temperature A first light emitting group and a second light emitting group having a second color temperature and being turned on at a second turn-on voltage (VA) higher than the first turn-on voltage, wherein the first light emitting group and the second light emitting group are connected in parallel And a voltage regulator disposed between the DC power supply and the light emitting unit and adapted to regulate a magnitude of a voltage applied from the DC power supply to the light emitting unit, wherein the voltage regulator includes at least one variable resistor The second light emitting group is controlled to emit light by controlling the magnitude of the voltage applied to the light emitting unit side, Thereby realizing a specific color temperature according to the ratio.

According to one embodiment, the illumination device further includes a substrate, and the first light emitting group is disposed on the substrate inward of the second light emitting group.

According to an exemplary embodiment, the first light emitting group emits light in the order of the second light emitting group according to the magnitude of the turn-on voltage.

According to one embodiment, the first light emitting group includes one or more light emitting diodes that emit warm white light having a color temperature of 3000K or less.

According to one embodiment, the second light emitting group includes one or more light emitting diodes that emit cool white light having a color temperature of 5000K or more.

According to one embodiment, the first light emitting group includes one or more light emitting diodes that emit warm white light having a color temperature of 3000K or less, and the second light emitting group is a cool white light having a color temperature of 5000K or more And at least one light emitting diode for emitting light.

According to one embodiment, the light emitting unit emits white light having a color temperature of 3000K to 8000K.

According to an embodiment, the voltage regulator applies a voltage having a magnitude between the second turn-on voltage and the first turn-on voltage to the light emitting unit to turn on only the first light emitting group, A voltage higher than the second turn-on voltage is applied to turn on both the first light emitting group and the second light emitting group.

According to one embodiment, the voltage regulator includes a T-type circuit having a respective branch resistance.

According to one embodiment, the branching resistance between the center node of the T-type circuit and the anode of the DC power supply is a variable resistance.

According to one embodiment, the branching resistance between the center node of the T-type circuit and the cathode of the direct current power source is a variable resistance.

According to one embodiment, the branching resistance between the central node of the T-type circuit and the input terminal of the light emitting portion is a variable resistor.

In the present invention, during the operation of the light emitting unit that emits warm white light, the light emitting unit that emits the cool white light only by adjusting the voltage is not caused to emit light or emit light, so that a specific color temperature according to a predetermined ratio can be implemented by the user It is effective.

1 is a block diagram of a conventional illumination device,
2 is a block diagram of a lighting apparatus according to an embodiment of the present invention,
3 is a block diagram of a lighting apparatus according to another embodiment of the present invention,
4 is a graph of a voltage applied to the variable resistor Rt and a voltage characteristic applied to the resistor R2 in Fig. 3,
5 is a block diagram of a lighting apparatus according to another embodiment of the present invention,
FIG. 6 is a graph of a voltage characteristic applied to the variable resistor Rt in FIG. 5,
7 is a block diagram of a lighting apparatus according to another embodiment of the present invention,
FIG. 8 is a graph of voltage characteristics across the resistor R2 in FIG.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. It is to be noted that the accompanying drawings and the embodiments described with reference to the drawings are simplified and illustrated for facilitating understanding of the present invention by those skilled in the art.

FIG. 2 is a block diagram of a lighting apparatus according to an embodiment of the present invention, FIG. 3 is a block diagram of a lighting apparatus according to another embodiment of the present invention, and FIG. 5 is a block diagram of a lighting apparatus according to another embodiment of the present invention, FIG. 6 is a graph of voltage characteristics applied to the variable resistor Rt in FIG. 5, and FIG. Is a block diagram of a lighting apparatus according to another embodiment of the present invention, and Fig. 8 is a graph of voltage characteristics across the resistor R2 in Fig.

2, a lighting apparatus according to an exemplary embodiment of the present invention includes a DC power supply 110, a light emitting unit 120 that receives DC voltage from a DC power supply unit 110, The specific light emitting group in the light emitting unit 120 is lighted or not emitted by controlling the magnitude of the voltage applied to the light emitting unit 120. The predetermined color temperature .

The direct current power source 110 may be a direct current power source, or may be a direct current voltage supplied to the light emitting unit 120 after being converted to direct current through a rectifying circuit, an AC-DC converter,

The light emitting unit 120 includes first light emitting groups 122 and 123 and second light emitting groups 121 and 124 having different turn-on voltages and color temperatures. The first light emitting group 122, 123 is a light emitting group which is turned on at a first turn-on voltage (V _B ) or more, and has a first color temperature. The second light emitting group 121, 124 is a light emitting group turned on at a second turn-on voltage (V _A ) or higher, and has a second color temperature. Here, the first turn-on voltage V _B is lower than the second turn-on voltage V _A. The first color temperature of the first light emitting groups 122 and 123 of the light emitting unit 120 may be 3000K or less and the second color temperature may be 5000K or more. The light emitting unit 120 can totally emit white light having a color temperature of 3000K to 8000K.

2, the first light emitting groups 122 and 123 and the second light emitting groups 121 and 124 are divided into two groups, and the first light emitting group 121 and the second light emitting group 121 are formed inside the second light emitting groups 121 and 124, respectively. The light emitting groups 122 and 123 may be arranged such that all the light emitting groups 121, 122, 123 and 124 are connected in parallel with each other. Further, the first light emitting group and the second light emitting group may be divided into three or more and arranged in parallel to each other.

The voltage regulator 130 regulates the magnitude of the voltage applied from the DC power supply 110 to the light emitting unit 120 side. The specific circuit configuration of the voltage regulator 130 and the position in the lighting device may vary. The voltage regulator 130 applies a voltage having a magnitude between the second turn-on voltage V _A and the first turn-on voltage V _B to the first light emitting group 122, 123, The first light emitting groups 122 and 123 and the second light emitting groups 121 and 124 may be turned on by applying a voltage higher than the second turn-on voltage V _A to the light emitting unit 120 have. Accordingly, the light emitting unit 120 may be turned on only when the first light emitting groups 122 and 123 are turned on and the first light emitting groups 122 and 123 are turned on, depending on the magnitude of the voltage controlled by the voltage adjusting unit 130. [ And the second light emitting groups 121 and 124 are turned on at the same time.

The first light emitting groups 122 and 123 of the light emitting unit 120 include one or more light emitting diodes that emit warm white light having a first color temperature of 3000 K or less, Includes at least one light emitting diode emitting a second color temperature, i.e., cool white light of 5000K or more. In terms of the color temperature, the turn-on voltage characteristic of the light emitting portion generally has a higher turn-on voltage as the color temperature is higher. Therefore, the first turn-on voltage V _B , which is the turn-on voltage of the first light emitting groups 122 and 123, is lower than the second turn-on voltage V _A , which is the turn-on voltage of the second light emitting groups 121 and 124.

The DC power supply 110 for supplying DC power, the voltage regulator 130 and the light emitting unit 120 may be mounted on one substrate. Particularly, in the light emitting unit 120 mounted on the substrate, The first light emitting groups 122 and 123 to the second light emitting groups 121 and 124 are arranged in the second light emitting group 120 according to the magnitude of the voltage applied to the light emitting unit 120, ) Can be sequentially emitted from the inside to the outside.

Next, operation characteristics of the lighting apparatus and the light emitting unit according to an embodiment of the present invention will be described with reference to FIGS. 3 and 4. FIG. Referring to FIG. 3, the voltage regulator 130 is located between the DC power supply 110 and the light emitting unit 120. The voltage regulator 130 includes a variable resistor Rt to regulate the variable resistor Rt so that the voltage applied to the variable resistor Rt is regulated thereby to cause the DC power supply 110 to emit light from the light emitting unit 120, And adjusts the magnitude of the applied voltage.

The voltage regulator 130 is a T-type circuit having branch resistors Rt, R1 and R2 for the shunt of the T-type circuit. In the example of FIG. 3, the center node Nc and the DC power supply And the branching resistance Rt between the positive electrode (+) of the capacitor 110 is a variable resistor. 4 shows characteristic curves of the voltage V _Rt applied to the variable resistor Rt and the voltage V _R2 applied to the light emitting portion 120 side according to the insertion of the voltage regulating portion 130. Analyzing the voltage regulator 130, the voltage V _Rt across the variable resistor Rt can be expressed as: < EMI ID = _1.0 >

[Equation 1]

V _Rt = (Rt * Vs) / {Rt + (R1 // R2)}

Therefore, as can be seen from the above equation, when the variable resistor Rt is adjusted, V _Rt is proportional thereto, and the range is set to 0 < V _Rt < Vs. The voltage V _R2 applied to the light emitting unit 120, that is, the voltage V _R2 across the resistor R 2 can be expressed by the following equation (2).

&Quot; (2) &quot;

V _R2 = Vs-V _Rt = Vs- (Rt * Vs) / {Rt + (R1 // R2)}

    = Vs * [R1 * R2 / {Rt * (R1 + R2) + R1 * R2}]

Therefore, as the variable resistor Rt is adjusted, V _R2 exhibits the same voltage characteristic as the graph g2 in FIG. V _R2, so visible to the voltage applied to the side of the light emitting unit 120 (wherein R1 is functioning as a resistor for determining the current flowing through the side of the light emitting portion 120 on the circuit), V _R2, the first turn-on voltage (V _B) The light emitting unit 120 does not operate. That is, the case where the variable resistor Rt is made larger than Rt2 is the case. On the other hand, when the variable resistor Rt is adjusted to be between Rt1 and Rt2, V _R2 is between the first turn-on voltage V _B and the second turn-on voltage V _A (region S1) , Only the first light emitting groups 122 and 123 emit light. When the variable resistor Rt is adjusted to be smaller than Rt1, V _R2 is made larger than the second turn-on voltage V _A (region S2). In this case, the first light emitting group 122, (121, 124) emit light at the same time. Accordingly, only the first light emitting groups 122 and 123 are caused to emit light by appropriately adjusting the variable resistor Rt of the voltage regulating unit 130, or the first light emitting groups 122 and 123 and the second light emitting group (121, 124) to emit light at the same time, so that warm white and cool white can be simultaneously emitted.

5 and 6 illustrate a case where the voltage regulator 130 is a T-type circuit and the variable resistor Rt is disposed between the center node Nc and the negative terminal (-) of the DC power supply 110 to be. The voltage (V _Rt ) across the variable resistor Rt can be expressed by the following equation (3).

&Quot; (3) &quot;

V _Rt = Vs * [R1 / {R1 * R2 / Rt + (R1 + R2)}

Since the voltage across the variable resistor Rt can be regarded as a voltage applied to the light emitting portion 120 side (here, R1 acts as a resistor for determining the current flowing to the light emitting portion 120 side on the circuit) Voltage characteristic curve. When the variable resistor Rt is adjusted to be smaller than Rt1, the light emitting portion 120 does not operate. When the variable resistor Rt is adjusted to be between Rt1 and Rt2 (region S1), V _Rt is between the first turn-on voltage (V _B ) and the second turn-on voltage (V _A ) Only the light emitting groups 122 and 123 emit light. On the other hand, when the variable resistor Rt is adjusted to be larger than Rt2 (region S2), V _Rt becomes larger than the second turn-on voltage V _{A. In} this case, the first light emitting group 122, And the second light emitting groups 121 and 124 emit light at the same time. Accordingly, only the first light emitting groups 122 and 123 are caused to emit light by appropriately adjusting the variable resistor Rt of the voltage regulating unit 130, or the first light emitting groups 122 and 123 and the second light emitting group (121, 124) to emit light at the same time, so that both warm white and cool white can emit light.

7 and 8 illustrate a case where the voltage regulator 130 is a T-type circuit and the variable resistor Rt is disposed between the center node Nc and the input terminal N1 of the light emitting unit 120 .

The voltage V _R2 across _R2 can be expressed as: &quot; (4) &quot;

&Quot; (4) &quot;

V _R2 = Vs * [R2 / {(R1 + R2) + R1 * R2 / Rt}

The voltage applied to the variable resistor R2 can be regarded as a voltage applied to the light emitting portion 120 side (here, Rt itself acts as a resistor for determining the current flowing to the light emitting portion 120 side on the circuit) The same voltage characteristic curve is shown. When the variable resistor Rt is smaller than Rt1, the light emitting unit 120 does not operate. When the variable resistor Rt is regulated between Rt1 and Rt2, V _R2 is between the first turn-on voltage (V _B ) and the second turn-on voltage (V _A ) (region S1) , 123 emit only light. On the other hand, when the variable resistor Rt is adjusted to be larger than Rt2, V _R2 becomes larger than the second turn-on voltage V _A (region S2), and in this case, the first light emitting group 122, (121, 124) emit light at the same time. In this case, too, only the first light emitting groups 122 and 123 are caused to emit light by appropriately adjusting the Rt of the voltage regulating unit 130, thereby realizing warm white light, or the first light emitting groups 122 and 123, The groups 121 and 124 are caused to emit light at the same time, so that both warm white and cool white can emit light.

When the variable resistor Rt is disposed between the center node Nc and the input terminal N1 of the light emitting portion 120 in the three types described above, the variable resistor Rt and the light emitting portion 120 are directly And the current flowing to the light emitting portion 120 side also needs to be taken into consideration, so that it may not be preferable to the two arrangement examples described above. As described above, the light emitting unit 120 can totally emit white light having a color temperature of 3000K to 8000K.

3 to 8, the T-type circuit is inserted as an example of the voltage regulator 130. However, the present invention is not limited to this, The voltage regulator 130 may be implemented with various circuits or components to regulate the voltage.

As described above, according to the present invention, in the operation of the light emitting unit that emits the warm white light, the light emitting unit that emits cool white light is not caused to emit or emit light only by the adjustment of the turn-on voltage, Can be minimized, thereby increasing the efficiency and reducing the cost of implementing the lighting device.

110: DC power source
120:
122, 123: first light emitting group 121, 124: second light emitting group
130:

Claims (12)

DC power supply;
A first light emitting group having a first color temperature and turned on at a first turn-on voltage (VB) or higher and a second turn-on voltage having a second color temperature and being greater than the first turn-on voltage And a second light emitting group that is turned on at a first light emitting group (VA) or higher, wherein the first light emitting group and the second light emitting group are connected in parallel; And
And a voltage regulator located between the direct current power source and the light emitting unit to adjust a magnitude of a voltage applied from the direct current power source to the light emitting unit,
The voltage regulator includes at least one variable resistor to control the magnitude of the voltage applied to the light emitting unit so that the second light emitting group is not emitted or emitted, Wherein the light source is a light source. The illumination device according to claim 1, further comprising a substrate,
And the first light emitting group is disposed on the substrate inward of the second light emitting group. The lighting apparatus according to claim 1, wherein the light emitting unit emits light in the order of the first light emitting group to the second light emitting group according to the magnitude of the turn-on voltage. The lighting apparatus according to claim 1, wherein the first light emitting group includes one or more light emitting diodes for emitting warm white light having a color temperature of 3000K or less. The lighting apparatus according to claim 1, wherein the second light emitting group includes one or more light emitting diodes for emitting cool white light having a color temperature of 5000K or more. The light emitting device of claim 1, wherein the first light emitting group includes one or more light emitting diodes that emit warm white light having a color temperature of 3000K or less and the second light emitting group emits cool white light having a color temperature of 5000K or more And at least one light emitting diode for emitting light. The lighting apparatus according to claim 1, wherein the light emitting unit emits white light having a color temperature of 3000K to 8000K. The organic light emitting display according to claim 1, wherein the voltage regulator applies a voltage having a magnitude between the second turn-on voltage and the first turn-on voltage to the light emitting unit to turn on only the first light emitting group, On voltage is applied to the first light-emitting group and the second light-emitting group to turn on both the first light-emitting group and the second light-emitting group. The method according to claim 1,
Wherein the voltage regulator includes a T-type circuit having a respective branch resistance. The method of claim 9,
And the branching resistance between the center node of the T-type circuit and the anode of the DC power source portion is a variable resistor. The method of claim 9,
And the branching resistance between the center node of the T-type circuit and the cathode of the DC power source portion is a variable resistor. The method of claim 9,
And the branching resistance between the central node of the T-type circuit and the input terminal of the light emitting portion is a variable resistor.

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