KR20170049677A - Light control apparatus and method - Google Patents

Abstract

The present invention relates to an illumination control apparatus having a light source module; and a method thereof. Embodiments provide an illumination control apparatus and a method capable of changing a color temperature of a light source module in an abnormal mode. According to an embodiment of the present invention, a lighting control apparatus comprises: a wireless reception module to receive a signal from the outside; a power supply unit to supply power; a light source module having a plurality of light emitting diodes to emit different peak wavelengths; a control unit to control the light emitting diode to output a control signal to change the color temperature of the light source module; a driving unit to adjust a current supplied to the light emitting diode of the light source module by the control signal of the control unit; and a memory unit wherein control data of the light source module is stored. The control unit comprises: a reception module check unit to check errors of the wireless reception module; a voltage sensing unit to sense a voltage supplied from the power supply unit; a counter unit to count time when sensed voltage of the voltage sensing unit is less than or equal to a reference level; and a color temperature control unit to vary the color temperature of the light source module in accordance with the count value of the counter unit.

Description

[0001] LIGHT CONTROL APPARATUS AND METHOD [0002]

The present invention relates to an illumination control apparatus and method having a light source module.

BACKGROUND ART A light emitting device, for example, a light emitting device (Light Emitting Device) is a type of semiconductor device that converts electrical energy into light, and has been widely recognized as a next generation light source in place of existing fluorescent lamps and incandescent lamps.

Since the light emitting diode generates light by using a semiconductor element, the light emitting diode consumes very low power as compared with an incandescent lamp that generates light by heating tungsten, or a fluorescent lamp that generates ultraviolet light by impinging ultraviolet rays generated through high-pressure discharge on a phosphor .

In addition, since the light emitting diode generates light using the potential gap of the semiconductor device, it has a longer lifetime, faster response characteristics, and an environment-friendly characteristic as compared with the conventional light source.

Accordingly, much research has been conducted to replace an existing light source with a light emitting diode. The light emitting diode has been increasingly used as a light source for various lamps used in indoor and outdoor, lighting devices such as a liquid crystal display, have.

As the modern living environment develops, interior lighting is being advanced in lighting by expressing the color of indoor light, that is, color temperature, variously in a white light by a conventional fluorescent lamp or a halogen lamp. Particularly, efforts to apply an illumination device using a light emitting diode (LED) as a light source as the most representative illumination device of the above-mentioned illumination are progressing steadily.

Embodiments provide an illumination control apparatus and method that can change the color temperature of a light source module in an abnormal mode.

Embodiments provide a lighting control apparatus and method that can change the color temperature of a light source module by sensing and counting a level change of a supply voltage.

Embodiments provide an illumination control apparatus and method that can change the color temperature of a light source module using at least one of a supply voltage and a wireless reception module.

A lighting control apparatus according to an embodiment of the present invention includes: a wireless receiving module that receives a signal from the outside; A power supply unit for supplying power; A light source module having a plurality of light emitting diodes emitting different peak wavelengths; A controller for controlling the light emitting diode to output a control signal for changing a color temperature of the light source module; A driving unit for adjusting a current supplied to the light emitting diode of the light source module by a control signal of the control unit; And a memory unit for storing control data of the light source module, wherein the control unit comprises: a receiving module check unit for checking whether the wireless receiving module is errory; A voltage sensing unit for sensing a voltage supplied from the power supply unit; A counter for counting a time when the voltage sensed by the voltage sensing unit is lower than a reference level; And a color temperature controller for varying a color temperature of the light source module according to a count value of the counter.

A lighting control method according to an embodiment includes: sensing a level of a supply voltage; Detecting that the level of the supply voltage is below a reference for a predetermined time; Counting if the level of the supply voltage is below a reference level; Decoding the selected color temperature data according to the counted result; Outputting a control signal to the light source module according to the decoded color temperature data; And driving the plurality of light emitting diodes in the light source module by the output control signal to change the color temperature to the color temperature.

The embodiment can change the color temperature of the light source module without a communication module.

Embodiments can change the color temperature without additional wired or wireless equipment.

The embodiment can change the color temperature without using the communication equipment, thereby improving the reliability of the lighting apparatus.

The embodiment can vary the CCT using the supply voltage, so that lighting control can be convenient.

The embodiment can improve the reliability of the light source module and the lighting control device having the same.

1 is a block diagram showing a lighting control apparatus having a light source module according to a first embodiment.
2 is a detailed configuration diagram of the control unit of FIG.
3 is a view illustrating an example of the light source module of FIG.
4 is a view showing another example of the light source module of FIG.
5 is a view showing another example of the light source module of FIG.
6 is a flowchart showing a lighting control method of a lighting apparatus having a light source module according to an embodiment.
7 is a configuration diagram illustrating an example of a light emitting diode according to an embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise. Whenever a portion of a layer, film, region, plate, or the like is referred to as being "on" another portion, it includes not only the case where it is "directly on" another portion, but also the case where there is another portion in between. Conversely, when a part is "directly over" another part, it means that there is no other part in the middle.

FIG. 1 is a block diagram showing a lighting control apparatus having a light source module according to a first embodiment, and FIG. 2 is a detailed block diagram of the control unit shown in FIG. 1. Referring to FIG.

1 and 2, the illumination control apparatus includes a light source module 100, a control unit 500 for controlling the light source module 100, and a wireless transmission module 100 for transmitting a control signal to the control unit 500. [ (550).

The control unit 500 includes a control unit 510, a power supply unit 540, a wireless receiving module 545, a driving unit 530, and a memory unit 520. This control unit 500 can control the driving and color temperature of the light source module 100 by an external control signal of the illumination in the illumination device.

The control unit 510 supplies the voltage supplied from the power supply unit 540 and analyzes the signals received from the wireless reception module 545 to perform various kinds of control. The power supply unit 540 may be a converter. For example, the power supply unit 540 supplies a DC voltage to the control unit 510 as a DC-DC converter. The power supply unit 540 supplies each kind of DC voltage to the control unit 500.

The radio receiving module 545 receives a radio control signal transmitted from the outside. For example, the wireless receiving module 545 receives a wireless control signal from the wireless transmitting module 550. [ The wireless transmission module 550 may be a Bluetooth module or a Wi-Fi module provided in the user's wireless device.

The radio receiving module 545 transmits the received control signal to the controller 510. The control unit 510 decodes the signal received from the wireless receiving module 545 and controls the light source module 100 by referring to the memory unit 520 as a decoded value. Also, the controller 510 may check the error state of the wireless receiving module 545. [

The control unit 510 checks the level change of the supply voltage of the power supply unit 540 to check whether an external operation signal is input. When the external operation signal is input, the control unit 510 decodes the data, The color temperature of the light source module 100 is controlled by referring to the color temperature sensor 520.

The light source module 100 may include a light source unit 4 having a plurality of light emitting diodes 4A, 4B and 4C arranged on a circuit board 101 as shown in Figs. The plurality of light emitting diodes 4A, 4B, and 4C may emit different colors or emit different peak wavelengths. Each of the light emitting diodes 4A, 4B, and 4C may be an LED that emits at least three colors, for example, red, green, and blue.

The plurality of light emitting diodes 4A, 4B, and 4C may emit white light having different color temperature (CCT). By using a plurality of light emitting diodes 4A, 4B, and 4C in the embodiment, efficiency can be increased as compared with a light source such as a fluorescent lamp, and the life of the light source can be prolonged. The color temperature may be a luminance ratio of red, green, and blue. As the brightness of one or more of these three colors becomes higher or lower, the same white color appears as a red or blue color. White is classified into Warm white, Neutral white and Cool white depending on the color temperature. The warm white may be classified into about 2700K to 4000K, the neutral white to 4000K to 5000K, and the cool white to 5000K or more. In the embodiment, the first color temperature can be set to neutral white, the second color temperature can be set to warm white, and the third color temperature can be set to cool white.

The plurality of light emitting diodes 4A, 4B and 4C may include a first light emitting diode 4A, a second light emitting diode 4B and a third light emitting diode 4C. is and emitting red light by the first current signal (I _R), the second light emitting diode (4B) of the second light-emitting the green light, and by the current signal (I _G), the third light emitting diode (4C) is And the blue light is emitted by the third current signal I _B.

At least one, two or all of the first to third light emitting diodes 4A, 4B and 4C may be arranged in one or more than one. For example, each of the first and second light emitting diodes 4A and 4B may be arranged in plural, but the present invention is not limited thereto. A third light emitting diode 4C may be disposed between the plurality of first light emitting diodes 4A and a third light emitting diode 4C may be disposed between the plurality of second light emitting diodes 4B. The arrangement order and arrangement of the plurality of light emitting diodes 4A, 4B and 4C are not limited. The first to third light emitting diodes 4A, 4B and 4C may be driven independently or group by group. At least one or all of the first to third light emitting diodes 4A, 4B and 4C may be connected in series.

The first light emitting diode 4A may emit red light in the visible light spectrum, for example, light having a peak wavelength between 614 nm and 620 nm. The second light emitting diode 4B may emit green light in the visible light spectrum, for example, light having a peak wavelength between 540 nm and 550 nm. The third light emitting diode 4C emits blue light in the visible light spectrum and may emit light having a peak wavelength, for example, between 450 nm and 470 nm.

Referring to FIG. 4, the light source module is configured by changing the third light emitting diode 4C among the first to third light emitting diodes 4A, 4B, and 4C in FIG. The third light emitting diode 4C may be embodied as a blue light emitting diode having an ultraviolet LED chip and a phosphor layer 41. The phosphor layer 41 may include a blue phosphor.

The first light emitting diode 4A may include a red light emitting diode having a red LED chip, and the second light emitting diode 4B may include a green light emitting diode having a green LED chip.

5 is another example of the light source module of FIG.

Referring to FIG. 5, the light source module is configured by changing the second light emitting diode 4B among the first to third light emitting diodes 4A, 4B, and 4C in FIG. The second light emitting diode 4B may be embodied as a green light emitting diode having an ultraviolet LED chip and a phosphor layer 42. The phosphor layer 42 may include a green phosphor. The first light emitting diode 4A includes a red light emitting diode having a red LED chip. The third light emitting diode 4C may include a blue light emitting diode having a blue LED chip or a blue light emitting diode having an ultraviolet LED chip and a blue phosphor as shown in FIG. The first light emitting diode 4A may be a red light emitting diode having a red LED chip.

1 and 3, a heat sensing element 5 is disposed on the circuit board 101 and the heat sensing element 5 is connected to a circuit pattern of the circuit board 101, 4A, 4B, and 4C, and transmits the sensed heat to the control unit 510. The heat sensing element 5 may be disposed adjacent to the third light emitting diode 4A having the highest heat generation characteristic among the light emitting diodes 4A, 4B, and 4C of the light source unit 4. [

The thermal sensing element 5 may be a thermistor, which is a variable resistor whose resistance value varies with temperature. The heat sensing element 5 may be a negative temperature coefficient (NTC) whose specific resistance decreases as the temperature rises. As another example, the heat sensing element 5 may be a positive temperature coefficient (PTC).

The color coordinates of the white light emitted from the light source module 100 may be shifted as the temperature increases. The control unit 510 detects the input current value according to the temperature data sensed from the thermal sensing element 5 of the light source module 100 by referring to the lookup table 522 of the memory unit 520, And controls the driving unit 530 by transmitting a current control signal.

Referring to FIG. 1, the memory unit 520 may store control information of the light source module 100. A lookup table 522 is stored in the memory unit 520. The memory unit 520 may be an EEPROM (Electrically Erasable Programmable Read-Only Memory). 4A, 4B and 4C of FIG. 3) of the light source module 100 so that white light having a predetermined CCT for each temperature sensed from the light source module 100 is emitted to the look-up table 522, ) Is stored as the intensity value of the input current.

The control unit 510 refers to the lookup table 522 of the memory unit 520 and determines the intensity value of the input current of each of the light emitting diodes 4A, 4B, and 4C to be output as white light, And outputs the current control signal corresponding to the current control signal to the driving unit 530. The lookup table 522 stores in advance a ratio (Ratio) of a reference current value corresponding to a CCT required in a driving mode or a user's selection. The ratio of the reference current values may be experiment data previously measured by a designer. As another example, the lookup table 522 may store intensity values of the input currents of the light emitting diodes 4A, 4B, and 4C that can compensate for the chromaticity change according to the temperature characteristics of the light source module 100. [

The controller 510 transmits the current control signal to the first to third drivers 531, 532, and 533 of the driver 530 so that the white light emitted from the light source module 100 becomes the white light having the predetermined CCT. The current control signal may be an intensity value of an input current to each of the light emitting diodes 4A, 4B and 4C. The current control signal may be a pulse width modulation (PWM) signal, an amplitude modulation signal, or an analog signal. In the present embodiment, the current control signal is limited to a PWM signal.

1 and 3, the first light emitting diode 4A of the light source module 100 is driven by the first current signal I _R of the first driving unit 531 of the driving unit 530, The second light emitting diode 4B is driven by the second current signal I _G of the second driver 532 and the third light emitting diode 4C is driven by the third current signal I _G of the third driver 533, I _B ). The light source module 100 can drive the first to third LEDs 4A, 4B and 4C by the first to third current signals I _R, I _{G and} I _B of the driving unit 530 have. The light source module 100 may emit red light, green light, or blue light, or may emit white light having a preset CCT, through first to third light emitting diodes 4A, 4B, and 4C selectively driven.

The first to third driving units 531, 532 and 533 of the driving unit 530 generate a driving current corresponding to the current control signal of the control unit 510, for example, a PWM signal to control the first to third light emitting diodes 4A and 4B , 4C.

Also, the controller 510 may control the compensation or emission of the white light, which is a reference for each CCT, by referring to the lookup table 522 of the memory 520.

Also, the controller 510 increases or decreases the input current value of each light emitting diode so that the color temperature value sensed by the color sensor 570 becomes a predetermined color temperature.

2, the control unit 510 may include a reception module check unit 512, a voltage sensing unit 514, a counter unit 516, and a color temperature control unit 518.

The voltage sensing unit 514 senses whether a supply voltage is less than a reference voltage. The counter 516 starts counting when the supply voltage is lower than the reference voltage for a predetermined time to detect a counter value.

The reception module check unit 512 determines whether the wireless reception module 545 is in an error state. The receiving module check unit 512 detects the error if the wireless receiving module 545 is in an error state such as a power off state or a communication impossible state. If it is determined that the detected state is the error state of the wireless receiving module 545, the control unit 510 recognizes the abnormal state and if the voltage sensed by the voltage sensing unit 514 is lower than the reference level, . If the color temperature is changed according to the detected counter value, the controller 510 outputs the control data corresponding to the detected counter value through the color temperature controller 518 to control the light source module 100 . Accordingly, the light source module 100 can output the first color temperature, the second color temperature, or the third color temperature according to the control data.

The control unit 510 refers to the memory unit 520 to receive data corresponding to the control signal of the user when a normal user's control signal is input to the wireless receiving module 545 of FIG. 1, and controls the light source module 100 So that the light is output to any one of the first to third color temperatures.

 Specifically, the operation of the control unit 510 will be described with reference to FIG. 6 together with the configuration of FIG. The control unit 510 detects a reception error of the wireless receiving module 545 (211). That is, it is checked whether the state of the wireless receiving module 545 is in the communication impossible state.

The control unit 510 detects (213) the voltage supplied from the power supply unit 540 in the reception error state, and decodes the received control signal when the control signal of the user is normally received without the reception error state ).

And checks whether the sensed voltage is equal to or lower than the reference voltage (215). If the sensed voltage exceeds the reference voltage, the process moves to step 219 of the first color temperature.

If the sensed voltage is equal to or lower than the reference voltage, the counter detects the counted value (216). At this time, if the counter value is 0, the process moves to the selection of the first color temperature (219). If the counter value is 1, the process moves to the selection process of the second color temperature (221) (Step 223). If the counter value is 1 second or less, the counter value is set to CNT = 0. If the counter value is 2 to 4 seconds, the counter value is classified as CNT = 1. If the counter value is 5 seconds or more, . In the embodiment, the counter value is classified into three, but it can be classified into two or four or more. The first color temperature may be neutral white, the second color temperature may be warm white, and the third color temperature may be cool white.

For example, the first color temperature selection step may output the first color temperature data (R0, G0, B0), and the second color temperature selection step may output the second color temperature data (R1, G1, B1) And the third color temperature selecting step may output the third color temperature data (R3, G3, B3).

The control unit 510 decodes the data of the selected color temperature by referring to the lookup table 522 of the memory unit 520 at step 225, when the data of the selected color temperature is selected from the first through third color temperatures. The decoding step 225 decodes the wireless reception data or the first through third color temperature data, and controls the light source module 100 according to the decoding result (227). The selected color temperature may be output according to the control result of the light source module 100.

The embodiment can count the off time of the abnormal user signal, for example, the supply voltage, when the wireless reception module 545 is in the error state, and can select a preset color temperature according to the count value.

<Light Emitting Diode>

7 is a view illustrating an example in which a light emitting diode according to an embodiment is disposed on a circuit board.

Referring to FIG. 7, the light source module includes a circuit board 10 and a light emitting diode 40 on the circuit board 10. The light emitting diode 40 may be any one of the light emitting diodes of the light source unit described in the embodiment, for example, the first to third light emitting diodes.

The pads P1 and P2 of the circuit board 10 are electrically connected to the light emitting diode 40 by bonding members 98 and 99. [

The circuit board 10 may be a metal-core PCB having a metal layer, a resin-made substrate, or a flexible substrate, but is not limited thereto.

The circuit board 10 may include, for example, a metal layer L1, an insulating layer L2, a wiring layer L4, and a protective layer L3, but is not limited thereto. The wiring layer L4 includes the pads P1 and P2.

The light emitting diode 40 may include a body 90, a plurality of lead frames 92 and 93, a light emitting chip 94, a bonding member 95, and a molding member 97.

The body 90 may be made of an insulating material, a light transmitting material, or a conductive material. The body 90 may be made of a resin material such as polyphthalamide (PPA), silicon (Si), metal material, PSG (PCB) such as Al ₂ O ₃ , silicon, an epoxy molding compound (EMC), a polymer series, a plastic series, and the like. For example, the body 90 may be made of a resin material such as polyphthalamide (PPA), silicone or an epoxy material. The shape of the body 90 may include polygonal, circular, or curved shapes as viewed from above, but is not limited thereto.

The body 90 may include a cavity 91. The cavity 91 may have an open top and an inclined surface. A plurality of lead frames 92 and 93, for example, two or three or more lead frames may be disposed on the bottom of the cavity 91. The plurality of lead frames 92 and 93 may be spaced apart from each other at the bottom of the cavity 91. The width of the cavity 91 may be wide and the top may be narrow, but the present invention is not limited thereto.

The lead frames 92 and 93 may be made of a metal material such as titanium (Ti), copper (Cu), nickel (Ni), gold (Au), chromium (Cr), tantalum (Ta) ), Tin (Sn), silver (Ag), and phosphorous (P), and may be formed of a single metal layer or a multilayer metal layer.

The gap between the plurality of lead frames 92 and 93 may be formed of an insulating material, and the insulating material may be the same material as the body 50 or other insulating material, but is not limited thereto.

The light emitting chip 94 may be disposed on at least one of the plurality of lead frames 92, 93, bonded to the bonding member 95, or flip-bonded. The bonding member 95 may be a conductive paste material containing silver (Ag).

The plurality of lead frames 92 and 93 are electrically connected to the pads P1 and P2 of the wiring layer L4 of the circuit board 10 through the bonding members 98 and 99. [

The light emitting chip 94 can selectively emit light in a visible light band to an ultraviolet light band. For example, a red LED chip, a blue LED chip, a green LED chip, a yellow green LED chip, a UV LED chip, and white LED chips. The light emitting chip 94 includes compound semiconductors of Group III-V or / and Group II-VII elements. Although the light emitting chip 94 is disposed in a chip structure having a horizontal electrode structure, the light emitting chip 94 may be arranged in a chip structure having a vertical electrode structure in which two electrodes are arranged up and down. The light emitting chip 94 is electrically connected to a plurality of lead frames 92 and 93 by an electrical connecting member such as a wire 96.

The light emitting diode 40 may be a first light emitting diode that emits red light, and the first light emitting diode may include a red LED chip or may include a UV LED chip and a red phosphor. have.

The light emitting diode 40 may be a second light emitting diode that emits green light, and the second light emitting diode may include a green LED chip or a UV LED chip and a green phosphor. have.

The light emitting diode 40 may be a third light emitting diode that emits blue light, and the third light emitting diode may include the light emitting chip 94 as a blue LED chip or may include a UV LED chip and a blue phosphor. have. The number of LED chips of the light emitting diode 40 may be one or two or more, but is not limited thereto.

One or two or more light emitting chips 94 may be disposed in the cavity 91, and two or more light emitting chips may be connected in series or in parallel. However, the present invention is not limited thereto.

A mold member 97 made of a resin material may be formed in the cavity 91. The molding member 97 includes a light-transmitting material such as silicon or epoxy, and may be formed as a single layer or a multilayer. The upper surface of the molding member 97 may include at least one of a flat shape, a concave shape, and a convex shape. For example, the surface of the molding member 97 may be formed as a concave curved surface or a convex curved surface, Such a curved surface may be a light emitting surface of the light emitting chip 94. [

The molding member 97 may include a fluorescent material for converting the wavelength of light emitted onto the light emitting chip 94 in a transparent resin material such as silicon or epoxy. The fluorescent material may include YAG, TAG, Silicate, Nitride , And an oxy-nitride-based material. The phosphor may include at least one of a red phosphor, a yellow phosphor, and a green phosphor, but the present invention is not limited thereto. The molding member 97 may not have a phosphor and is not limited thereto.

An optical lens (not shown) may be coupled onto the molding member 97, and the optical lens may use a transparent material having a refractive index of 1.4 to 1.7. The optical lens may be formed of a transparent resin material of a polymethyl methacrylate (PMMA) having a refractive index of 1.49, a polycarbonate (PC) having a refractive index of 1.59, an epoxy resin (EP), or a transparent glass have.

The light source module and / or the illumination device having the light source module disclosed in the embodiments include devices such as an interior lamp, an outdoor lamp, a street lamp, an automobile lamp, a headlight or a tail lamp of a moving or fixing device, and an indicator lamp.

The light source module or / and the illumination device having the light source module disclosed in the embodiments can be applied to a display device. The display device may be provided as a module or unit for irradiating light from behind a panel such as a liquid crystal display panel.

The features, structures, effects and the like described in the embodiments are included in at least one embodiment of the present invention and are not necessarily limited to only one embodiment. Furthermore, the features, structures, effects and the like illustrated in the embodiments can be combined and modified by other persons skilled in the art to which the embodiments belong. Therefore, it should be understood that the present invention is not limited to these combinations and modifications.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of illustration, It can be seen that various modifications and applications are possible. For example, each component specifically shown in the embodiments can be modified and implemented. It is to be understood that all changes and modifications that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

1A: First light emitting diode 2A: Second light emitting diode
3A: Third light emitting diode 4: Light source part
5: heat sensing element 10: circuit board
100: light source module 510:
520: memory unit 530:
540: Power supply unit 545: Wireless reception module
550: wireless transmission module 570: color sensor

Claims (10)

A wireless receiving module for receiving a signal from the outside;
A power supply unit for supplying power;
A light source module having a plurality of light emitting diodes emitting different peak wavelengths;
A controller for controlling the light emitting diode to output a control signal for changing a color temperature of the light source module;
A driving unit for adjusting a current supplied to the light emitting diode of the light source module by a control signal of the control unit; And
And a memory unit in which control data of the light source module is stored,
Wherein,
A receiving module check unit for checking whether the wireless receiving module is in error;
A voltage sensing unit for sensing a voltage supplied from the power supply unit;
A counter for counting a time when the voltage sensed by the voltage sensing unit is lower than a reference level; And
And a color temperature controller for varying the color temperature of the light source module according to a count value of the counter unit. The method according to claim 1,
Wherein the light source module emits at least three different colors. 3. The method according to claim 1 or 2,
And a color sensor for detecting a color temperature of light emitted from the light source module and transmitting the color temperature to the control unit. 3. The method according to claim 1 or 2,
Wherein the controller adjusts the color temperature to Neutral White, Warm White or Cool White according to a counter value of the counter. 3. The method according to claim 1 or 2,
Wherein the control unit changes the color temperature according to a control signal received from the wireless receiving module. 3. The method according to claim 1 or 2,
And a color sensor for detecting the color temperature of the light source module and transmitting the color temperature to the control unit. Sensing a level of the supply voltage;
Detecting that the level of the supply voltage is below a reference for a predetermined time;
Counting if the level of the supply voltage is below a reference level;
Decoding the selected color temperature data according to the counted result;
Outputting a control signal to the light source module according to the decoded color temperature data; And
And driving the plurality of light emitting diodes in the light source module according to the output control signal to change the color temperature to the color temperature. 8. The method of claim 7,
Wherein the color temperature is selected from Neutral white, Warm white or Cool white. 8. The method of claim 7,
Wherein the supply voltage sensing step comprises:
And if the wireless receiving module is in error, sensing the supply voltage. 8. The method of claim 7,
Wherein the plurality of light emitting diodes emit red, green, and blue light.

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