WO2021150005A1

WO2021150005A1 - Apparatus for controlling lighting and lighting device comprising same

Info

Publication number: WO2021150005A1
Application number: PCT/KR2021/000762
Authority: WO
Inventors: 장두원; 조규원
Original assignee: 주식회사 필룩스
Priority date: 2020-01-22
Filing date: 2021-01-19
Publication date: 2021-07-29
Also published as: KR102193445B1

Abstract

Disclosed are a lighting control device and a lighting device comprising same. A lighting device according to an embodiment disclosed herein comprises: a lighting unit comprising a first light-emitting means and a second light-emitting means, each having an end electrically connected to a power supply; a first signal control unit for generating a color temperature adjustment signal for color temperature adjustment of the first light-emitting means and the second light-emitting means; a first switch which is a transistor, the first switch having a first terminal electrically connected to the first signal control unit, having a second terminal electrically connected to another end of the first light-emitting means, and having a third terminal electrically connected to a ground; a pull-up resistor having an end electrically connected to the power supply and having another end electrically connected to the second terminal of the first switch; and a second switch which is a transistor, the second switch having a first terminal electrically connected to the second terminal of the first switch, having a second terminal electrically connected to another end of the second light-emitting means, and having a third terminal electrically connected to the ground. The first terminal of the second switch is electrically connected to another end of the pull-up resistor. The color temperature adjustment signal is a pulse width modulation (PWM) signal. The PWM signal is input to the first terminal of the first switch. When the first switch is turned on, the first terminal of the second switch is electrically connected to the ground, and the second switch is accordingly turned off. When the first switch is turned off, the second switch is turned on by the pull-up resistor.

Description

Lighting control device and lighting device having same

Embodiments of the present invention relate to lighting control technology.

Recently, a light emitting diode (LED) of high efficiency and low power has been in the spotlight as a lighting means. The LED may control a correlated color temperature using a pulse width modulation (PWM) signal. The conventional correlated color temperature control technology uses two PWM signals (ie, a PWM signal for a warm series of correlated color temperatures and a PWM signal for a cool series of correlated color temperatures) to mix the light output of each LED to allow the user to Correlated color temperature is used.

However, according to the prior art, there is a problem in that the flicker index increases in a section in which two PWM signals are generated on the same time axis and the two PWM signals are combined.

An embodiment of the present invention is to provide a lighting control device capable of reducing flicker and a lighting device having the same.

A lighting device according to an embodiment of the present disclosure includes: a lighting unit including a first light emitting means and a second light emitting means each having one end electrically connected to a power source; a first signal controller for generating a color temperature control signal for adjusting the color temperature of the first light emitting means and the second light emitting means; a first switch comprising a transistor, a first terminal electrically connected to the first signal controller, a second terminal electrically connected to the other end of the first light emitting means, and a third terminal electrically connected to a ground; a pull-up resistor having one end electrically connected to the power source and the other end electrically connected to the second terminal of the first switch; and a transistor, a first terminal electrically connected to a second terminal of the first switch, a second terminal electrically connected to the other end of the second light emitting means, and a third terminal electrically connected to the ground 2 switches, wherein a first terminal of the second switch is electrically connected to the other end of the pull-up resistor, the color temperature control signal is a PWM (Pulse Width Modulation) signal, and the PWM signal is a signal of the first switch. is input to the first terminal, and when the first switch is turned on, the second switch is turned off while the first terminal of the second switch is electrically connected to the ground, and when the first switch is turned off, the pull-up resistor is by the second switch is provided to operate ON.

The lighting device may include: a second signal controller configured to generate a brightness control signal for controlling brightness of the first light emitting means and the second light emitting means; and a voltage adjusting unit electrically connected to the power source and applying the voltage to the first light emitting device and the second light emitting device by adjusting the magnitude of the voltage generated by the power according to the input brightness control signal.

The lighting device may include: a second signal controller configured to generate a brightness control signal for controlling brightness of the first light emitting means and the second light emitting means; and a brightness control unit electrically connected to the power source and configured to adjust the brightness of the first light emitting device and the second light emitting device according to the input brightness control signal.

The first switch and the second switch may be a first type transistor, and the brightness control unit may include: a driving unit to which the brightness control signal is input; and a transistor of a second type different from the first type and driven by the driving unit, a first terminal electrically connected to the driving unit, a second terminal electrically connected to the power source, and a third terminal connected to the power supply. It may include a first light emitting means, the second light emitting means, and a third switch electrically connected to the pull-up resistor, respectively.

The color temperature control signal may be a PWM signal having a first frequency, and the brightness control signal may be a PWM signal having a second frequency that is higher than the first frequency.

The lighting device may include: a second signal controller configured to generate a brightness control signal for controlling brightness of the first light emitting means and the second light emitting means; and a transistor, connected in series with the first switch between the first switch and the ground, and provided to adjust the brightness of the first light emitting element and the second light emitting element according to the input brightness control signal. 3 may further include a switch.

The first switch and the second switch are a first type transistor, the third switch is the first type transistor, a first terminal is electrically connected to the second signal control unit, and a second terminal may be electrically connected to a third terminal of the first switch, a third terminal may be electrically connected to the ground, and a third terminal of the second switch may be electrically connected to a second terminal of the third switch. .

A lighting control apparatus according to an embodiment of the present disclosure includes: a first signal controller for generating a color temperature control signal for adjusting the color temperature of the first light emitting means and the second light emitting means each having one end electrically connected to a power source; a first switch comprising a transistor, a first terminal electrically connected to the first signal controller, a second terminal electrically connected to the other end of the first light emitting means, and a third terminal electrically connected to a ground; a pull-up resistor having one end electrically connected to the power source and the other end electrically connected to the second terminal of the first switch; and a transistor, a first terminal electrically connected to a second terminal of the first switch, a second terminal electrically connected to the other end of the second light emitting means, and a third terminal electrically connected to the ground 2 switches, wherein a first terminal of the second switch is electrically connected to the other end of the pull-up resistor, the color temperature control signal is a PWM (Pulse Width Modulation) signal, and the PWM signal is a signal of the first switch. is input to the first terminal, and when the first switch is turned on, the second switch is turned off while the first terminal of the second switch is electrically connected to the ground, and when the first switch is turned off, the pull-up resistor is by the second switch is provided to operate ON.

According to the disclosed embodiment, the pull-up resistor is connected in parallel with the light emitting means between the power source and the first switch element, and the first terminal of the second switch element is electrically connected to the pull-up resistor and the second terminal of the first switch element. By doing so, when the PWM signal for color temperature control is input to the first switch element, the second switch element operates opposite to the first switch element so that the PWM signal does not overlap over the entire section, thereby minimizing the flicker effect. do.

In addition, since the color temperature control signal input to the first switch is inverted by the second switch, the color temperature of the first light emitting device and the second light emitting device can be simultaneously adjusted with one color temperature control signal.

1 is a circuit diagram of a lighting device according to an embodiment of the present invention;

2 is a graph illustrating a first channel signal and a second channel signal in a lighting device according to an embodiment of the present invention;

3 is a circuit diagram of a lighting device according to another embodiment of the present invention;

4 is a graph showing the waveform of a signal applied to each component in the lighting device according to another embodiment of the present invention;

5 is a graph illustrating color temperature control and brightness control for each channel in a lighting device according to another embodiment of the present invention;

6 is a circuit diagram of a lighting device according to another embodiment of the present invention;

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. The following detailed description is provided to provide a comprehensive understanding of the methods, apparatus, and/or systems described herein. However, this is only an example, and the present invention is not limited thereto.

In describing the embodiments of the present invention, if it is determined that the detailed description of the known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. In addition, the terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to intentions or customs of users and operators. Therefore, the definition should be made based on the content throughout this specification. The terminology used in the detailed description is for the purpose of describing embodiments of the present invention only, and should in no way be limiting. Unless explicitly used otherwise, expressions in the singular include the meaning of the plural. In this description, expressions such as “comprising” or “comprising” are intended to indicate certain features, numbers, steps, acts, elements, some or a combination thereof, and one or more other than those described. It should not be construed to exclude the presence or possibility of other features, numbers, steps, acts, elements, or any part or combination thereof.

On the other hand, directional terms such as top, bottom, one side, the other side, etc. are used in connection with the orientation of the disclosed drawings. Since components of embodiments of the present invention may be positioned in various orientations, the directional terminology is used for purposes of illustration and not limitation.

Also, terms such as first and second may be used to describe various components, but the components should not be limited by the terms. The above terms may be used for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, a first component may be referred to as a second component, and similarly, a second component may also be referred to as a first component.

1 is a circuit diagram of a lighting device according to an embodiment of the present invention.

Referring to FIG. 1 , the lighting device 100 includes a signal control module 102 , a lighting unit 104 , a switch unit 106 , a voltage adjuster 108 , and a pull-up resistor 110 . can In the disclosed embodiment, the signal control module 102, the switch unit 106, the voltage adjustment unit 108, and the pull-up (Pull Up) resistor 110 may constitute a lighting control device.

The signal control module 102 may generate a signal for controlling one or more of a color temperature and a brightness of the lighting unit 104 . In an exemplary embodiment, the signal control module 102 may include a first signal control unit 102a and a second signal control unit 102b.

The first signal control unit 102a may generate a signal (ie, a color temperature control signal) for adjusting the color temperature of the lighting unit 104 . In an exemplary embodiment, the color temperature control signal may be a pulse width modulation (PWM) signal. The first signal controller 102a may apply a color temperature control signal to the lighting unit 104 .

The second signal control unit 102b may generate a signal (ie, a brightness control signal) for adjusting the brightness of the lighting unit 104 . The brightness control signal may be a signal for adjusting the level of the voltage generated by the voltage control unit 108 . In an exemplary embodiment, the brightness control signal may be a PWM signal, but is not limited thereto, and various other types of signals (eg, an analog signal or a data signal) may be used. The second signal control unit 102b may apply a brightness control signal to the voltage control unit 108 .

The lighting unit 104 may include one or more light emitting means. In an exemplary embodiment, the lighting unit 104 may include a first light emitting means 104 - 1 and a second light emitting means 104 - 2 . The first light emitting means 104 - 1 and the second light emitting means 104 - 2 may be, for example, LEDs (Light Emitting Diodes).

The first light emitting means 104 - 1 and the second light emitting means 104 - 2 may emit light of different color temperatures. In an exemplary embodiment, any one of the first light emitting means 104-1 and the second light emitting means 104-2 has a first color temperature range (for example, a color temperature range of 1,000 to 4,000K, a warm system) color temperature range). The other of the first light emitting means 104-1 and the second light emitting means 104-2 may have a second color temperature range (for example, a color temperature range of 5,000 to 8,000K, a color temperature range of a cold system). there is. For example, the first light emitting means 104-1 may emit cool white light, and the second light emitting means 104-2 may emit warm white light, but limited thereto. it is not going to be Meanwhile, the lighting unit 104 can implement various color temperatures through color temperature control signals respectively applied to the first light emitting means 104 - 1 and the second light emitting means 104 - 2 .

The first light emitting means 104 - 1 and the second light emitting means 104 - 2 may be connected in parallel. The first light emitting means 104 - 1 and the second light emitting means 104 - 2 may be electrically connected to the voltage adjusting unit 108 , respectively.

The switch unit 106 may receive a color temperature control signal from the first signal control unit 102a to adjust the color temperature of the lighting unit 104 . In an exemplary embodiment, the switch unit 106 may include a first switch 106 - 1 and a second switch 106 - 2 . A transistor may be used as the first switch 106-1 and the second switch 106-2. Hereinafter, it will be described that the first switch 106 - 1 and the second switch 106 - 2 are metal oxide semiconductor (MOS) transistors as an example. However, the present invention is not limited thereto, and other types of switching devices, such as a field effect transistor (FET) or a bipolar transistor (BJT), may be used as the first switch 106 - 1 and the second switch 106 - 2 . .

A first terminal (ie, a gate terminal) of the first switch 106 - 1 may be electrically connected to the first signal controller 102a. That is, the color temperature control signal generated by the first signal controller 102a may be input to the first terminal of the first switch 106 - 1 . A second terminal (ie, a drain terminal) of the first switch 106 - 1 may be electrically connected to the first light emitting means 104 - 1 .

Here, one end of the first light emitting means 104 - 1 is electrically connected to the voltage adjusting unit 108 , and the other end of the first light emitting means 104 - 2 is the second terminal of the first switch 106 - 1 . can be electrically connected to. A third terminal (ie, a source terminal) of the first switch 106 - 1 may be electrically connected to a ground (ground).

A first terminal (ie, a gate terminal) of the second switch 106 - 2 may be electrically connected to a second terminal of the first switch 106 - 1 . A second terminal (ie, a drain terminal) of the second switch 106 - 2 may be electrically connected to the second light emitting means 104 - 2 . Here, one end of the second light emitting means 104 - 2 is electrically connected to the voltage adjusting unit 108 , and the other end of the second light emitting means 104 - 2 is the second terminal of the second switch 106 - 2 . can be electrically connected to. A third terminal (ie, a source terminal) of the second switch 106 - 2 may be electrically connected to a ground (ground).

The voltage control unit 108 may receive a brightness control signal from the second signal control unit 102b to adjust the brightness of the lighting unit 104 . That is, the brightness control signal generated by the second signal control unit 102b may be input to the voltage control unit 108 . The voltage adjusting unit 108 may adjust the magnitude of the voltage applied to the first light emitting means 104 - 1 and the second light emitting means 104 - 2 according to the input brightness control signal. The voltage adjuster 108 may be electrically connected to the power source Vcc, and may be provided to adjust the magnitude of the voltage by the power source Vcc according to an input brightness control signal.

One end of the pull-up resistor 110 may be electrically connected to the voltage adjuster 108 . The other end of the pull-up resistor 110 may be electrically connected to the second terminal of the first switch 106 - 1 . Also, the other end of the pull-up resistor 110 may be electrically connected to the first terminal of the second switch 106 - 2 . The pull-up resistor 110 may be connected in parallel to the first light emitting means 104 - 1 and the second light emitting means 104 - 2 .

Here, the operation of the lighting device 100 will be described as follows. Hereinafter, a case in which a PWM signal is used as a color temperature control signal will be described as an example. The PWM signal for color temperature control is input to the first terminal of the first switch 106 - 1 .

When the PWM signal of color temperature control is HIGH, the first switch 106-1 operates ON, and thus the first light emitting means 104-1 connected to the first switch 106-1 operates ON. . At this time, since the first terminal of the second switch 106-2 is electrically connected to the second terminal of the first switch 106-1, the first terminal of the second switch 106-2 is connected to the ground. While being electrically connected, the second switch 106-2 is turned OFF, and thus the second light emitting device 104-2 electrically connected to the second switch 106-2 is also turned OFF.

On the other hand, when the PWM signal of the color temperature control is LOW, the first switch 106-1 is turned off, so that the first light emitting means 104-1 electrically connected to the first switch 106-1 is also turned off. do. Here, since the first terminal of the second switch 106 - 2 is electrically connected to the other end of the pull-up resistor 110 , when a voltage is applied from the voltage adjuster 108 , the flow of current flows through the pull-up resistor 110 . ) flows to the first terminal of the second switch 106-2 to turn on the second switch 106-2, thereby turning on the second light emitting device 104-2.

Table 1 shows the operation relationship of the lighting device 100 .

	제1 스위치first switch	제1 발광소자first light emitting device	제2 스위치second switch	제2 발광소자second light emitting device
HIGHHIGH	ONON	ONON	OFFOFF	OFFOFF
LOWLOW	OFFOFF	OFFOFF	ONON	ONON

In the disclosed embodiment, the color temperature of the first light emitting device 104-1 and the second light emitting device 104-2 can be simultaneously adjusted by one color temperature control signal input to the first switch 106-1. do. That is, the first terminal of the second switch 106-2 is electrically connected to the second terminal of the first switch 106-1, and the pull-up resistor 110 is connected to the voltage adjusting unit 108 and the first switch ( By electrically connecting each of the second terminals of 106-1), it is possible to obtain an effect that the color temperature control signal input to the first switch 106-1 is inverted at the second switch 106-2. The color temperature of the first light emitting element 104-1 and the second light emitting element 104-2 can be simultaneously adjusted with the color temperature control signal of the first switch 106-1 and the second switch 106- 2), since the color temperature control signals respectively input do not overlap each other (that is, mutually inverted signals are applied), it is possible to minimize the effect of flicker in the lighting device.

2 is a graph illustrating a first channel signal and a second channel signal in a lighting device according to an embodiment of the present invention.

Here, the first channel signal is a signal applied to the first light emitting device 104 - 1 , and may be a signal for adjusting the color temperature and brightness of the first light emitting device 104 - 1 . The second channel signal is a signal applied to the second light emitting device 104 - 2 , and may be a signal for adjusting the color temperature and brightness of the second light emitting device 104 - 2 .

In this case, the color temperature control of the first light emitting device 104-1 and the second light emitting device 104-2 is performed in conjunction with the color temperature control signal generated by the first signal control unit 102a, and the first light emitting device ( 104-1) and the brightness control of the second light emitting device 104-2 is performed in conjunction with the brightness control signal generated from the second signal control unit 102b.

Referring to FIG. 2A , the first channel signal and the second channel signal may be signals having a voltage level of A (ie, the brightness control signal being voltage A). And, when the first channel signal is HIGH, the second channel signal becomes LOW, and when the first channel signal is LOW, the second channel signal becomes HIGH. That is, the second channel signal may be the same as that in which the first channel signal is inverted. In an exemplary embodiment, when the color temperature control signal is a PWM signal, the first channel signal may be the same as the PWM signal, and the second channel signal may be the same as the PWM signal inverted.

2(a) shows that the brightness control signal is voltage A, and when the voltage is reduced by 1/2 through the brightness control signal, as shown in FIG. 2(b), the first channel signal and the second channel signal The magnitude of the 2-channel signal becomes (1/2)A. In the disclosed embodiment, while adjusting the color temperature of the lighting unit 104 through the color temperature control signal, the brightness of the lighting unit 104 may also be adjusted through the brightness control signal.

3 is a circuit diagram of a lighting device according to another embodiment of the present invention. Here, a part different from the embodiment shown in FIG. 1 will be mainly described.

Referring to FIG. 3 , the lighting device 100 may include a signal control module 102 , a lighting unit 104 , a switch unit 106 , a pull-up resistor 110 , and a brightness control unit 112 . Here, the switch unit 106 includes a first switch 106-1 and a second switch 106-2, and the first switch 106-1 and the second switch 106-2 are of the first type. of a transistor (eg, an n-type MOS transistor).

In the disclosed embodiment, the brightness control unit 112 is included instead of the voltage control unit 108 . The brightness adjusting unit 112 may serve to adjust the brightness of the lighting unit 104 . The brightness control unit 112 may include a third switch 112a and a driving unit 112b.

In an exemplary embodiment, the third switch 112a may be a second type of transistor (eg, a p-type MOS transistor). That is, the third switch 112a may be a transistor of a different type from that of the first switch 106 - 1 and the second switch 106 - 2 .

A first terminal of the third switch 112a may be electrically connected to the driving unit 112b. The second terminal of the third switch 112a may be electrically connected to the power source Vcc. A third terminal of the third switch 112a may be electrically connected to one end of the pull-up resistor 110 , the first light emitting device 104 - 1 , and one end of the second light emitting device 104 - 2 , respectively. The driving unit 112b may drive the third switch 112a according to the brightness control signal of the second signal control unit 102b.

In an exemplary embodiment, both the color temperature control signal of the first signal control unit 102a and the brightness control signal of the second signal control unit 102b may be PWM signals. The PWM signal of the color temperature control may have a first frequency, and the PWM signal of the brightness control signal may have a second frequency higher than the first frequency. That is, in order to minimize the effect of flicker, the PWM signal of the brightness control signal may have a higher frequency than the PWM signal of the color temperature control signal. For example, the PWM signal of the brightness control signal may use a frequency of 4KHz or higher.

4 is a graph illustrating a waveform of a signal applied to each component in a lighting device according to another embodiment of the present invention.

Referring to FIG. 4 , the color temperature control signal may be a first PWM signal PWM 1 , and the brightness control signal may be a second PWM signal PWM 2 . Here, the frequency of the first PWM signal is 1 KHz, and the frequency of the second PWM signal is 4 KHz as an example.

The first PWM signal is input to the first switch 106 - 1 , and the second PWM signal is input to the brightness control unit 112 . The first switch 106-1 operates in correspondence with the first PWM signal (that is, the first PWM signal operates ON in the HIGH section and turns OFF in the section where the first PWM signal is LOW), and the second switch ( 106-2) may be operated to correspond to a signal in which the first PWM signal is inverted. That is, the second switch 106 - 2 may operate opposite to that of the first switch 106 - 1 . Here, the color temperature by the first PWM signal is 50% (that is, the duty ratio of the first PWM signal is 50%), and the illuminance by the second PWM signal is 50% (that is, the duty ratio of the second PWM signal is 50%) is shown as an example.

Here, according to the first PWM signal, the first light emitting device 104 - 1 is operated ON in a section in which the first PWM signal is HIGH, and is turned OFF in a section in which the first PWM signal is LOW. And, even in a section in which the first PWM signal is HIGH, ON is operated only in a section in which the second PWM signal is HIGH.

On the other hand, according to the first PWM signal, the second light emitting device 104-2 is operated ON in a section in which the first PWM signal is LOW, and is turned OFF in a section in which the first PWM signal is HIGH. And, even in the section in which the first PWM signal is LOW, the ON operation is performed only in the section in which the second PWM signal is HIGH.

Accordingly, the first light emitting device 104-1 and the second light emitting device 104-2 are turned ON at a ratio of 50:50 in the entire section to have a color temperature of 50%, and the first light emitting device 104-1 ) and the second light emitting device 104 - 2 are ON in only 50% of the entire section, so that the illuminance (brightness) becomes 50%.

5 is a graph illustrating color temperature control and brightness control for each channel in a lighting device according to another embodiment of the present invention.

First, referring to FIG. 5A , the first channel means a signal applied to the first light emitting device 104-1, and the first light emitting device 104-1 is cool white (CW). can emit light. The second channel means a signal applied to the second light emitting device 104 - 2 , and the second light emitting device 104 - 2 may emit warm white (WW) light. In addition, the PWM signal of the color temperature control may have a frequency of 1 KHz, and the PWM signal of the brightness control signal may have a frequency of 8 KHz.

Here, (b) of FIG. 5 is a view showing the first channel signal and the second channel signal when the color temperature is 100% cool white and the illuminance (brightness) is 50%, and FIG. 5 (c) is the color temperature cool white 50 %, a view showing a first channel signal and a second channel signal when the illuminance is 50% and the warm white is 50%, FIG. 5 (d) is a color temperature of 50% cool white, 50% warm white, and 100% illuminance A diagram showing the first channel signal and the second channel signal in the case of , (e) of FIG. 5 is the first channel signal and the second channel when the color temperature is 25% cool white, 75% warm white, and the illuminance is 100% It is a diagram showing signals, and FIG. 5 (f) is a diagram showing the first channel signal and the second channel signal when the color temperature is 25% cool white, 75% warm white, and the illuminance is 25%.

6 is a circuit diagram of a lighting device according to another embodiment of the present invention. Here, a part different from the embodiment shown in FIG. 1 will be mainly described.

Referring to FIG. 6 , the lighting apparatus 100 may include a signal control module 102 , a lighting unit 104 , a switch unit 106 , a pull-up resistor 110 , and a third switch 114 . Here, the switch unit 106 includes a first switch 106-1 and a second switch 106-2, and the first switch 106-1 and the second switch 106-2 are of the first type. of a transistor (eg, an n-type MOS transistor).

In the disclosed embodiment, a third switch 114 is included instead of the voltage regulator 108 . The third switch 114 may serve to adjust the brightness of the lighting unit 104 . In an exemplary embodiment, the third switch 114 may be a first type of transistor (eg, an n-type MOS transistor). That is, the third switch 114 may be the same type of transistor as the first switch 106 - 1 and the second switch 106 - 2 .

The third switch 114 may be provided between the ground and the first switch 106 - 1 and may be connected in series with the first switch 106 - 1 . Specifically, the first terminal of the third switch 114 may be electrically connected to the second signal controller 102b. That is, the brightness control signal of the second signal controller 102b may be input to the first terminal of the third switch 114 . A second terminal of the third switch 114 may be electrically connected to a third terminal of the first switch 106 - 1 . A third terminal of the third switch 114 may be electrically connected to a ground. In addition, the third terminal of the second switch 106 - 2 may be electrically connected to the second terminal of the third switch 114 .

Here, by preventing the first channel signal and the second channel signal from overlapping each other and the PWM signal of the brightness control signal having a higher frequency than the PWM signal of the color temperature control signal, the effect of flicker in the lighting device can be further reduced.

Although representative embodiments of the present invention have been described in detail above, those of ordinary skill in the art will understand that various modifications are possible without departing from the scope of the present invention with respect to the above-described embodiments. . Therefore, the scope of the present invention should not be limited to the described embodiments and should be defined by the claims described below as well as the claims and equivalents.

Claims

a lighting unit including a first light emitting means and a second light emitting means each having one end electrically connected to a power source;

a first signal controller for generating a color temperature control signal for adjusting the color temperature of the first light emitting means and the second light emitting means;

a first switch comprising a transistor, a first terminal electrically connected to the first signal controller, a second terminal electrically connected to the other end of the first light emitting means, and a third terminal electrically connected to a ground;

a pull-up resistor having one end electrically connected to the power source and the other end electrically connected to the second terminal of the first switch; and

a transistor, wherein a first terminal is electrically connected to a second terminal of the first switch, a second terminal is electrically connected to the other end of the second light emitting means, and a third terminal is electrically connected to a ground including a switch;

The first terminal of the second switch is electrically connected to the other end of the pull-up resistor,

The color temperature control signal is a PWM (Pulse Width Modulation) signal, and the PWM signal is input to a first terminal of the first switch,

During the ON operation of the first switch, the second switch is turned OFF while the first terminal of the second switch is electrically connected to the ground,

When the first switch is turned off, the second switch is turned on by the pull-up resistor.
The method according to claim 1,

The lighting device is

a second signal controller for generating a brightness control signal for adjusting the brightness of the first light emitting means and the second light emitting means; and

The lighting apparatus further comprising: a voltage adjusting unit electrically connected to the power source, adjusting the magnitude of the voltage by the power source according to the input brightness control signal, and applying the voltage to the first light emitting means and the second light emitting means.
The method according to claim 1,

The lighting device is

a second signal controller for generating a brightness control signal for adjusting the brightness of the first light emitting means and the second light emitting means; and

The lighting device further comprising: a brightness control unit electrically connected to the power source and configured to adjust the brightness of the first light emitting unit and the second light emitting unit according to the input brightness control signal.
4. The method according to claim 3,

The first switch and the second switch are transistors of a first type;

The brightness control unit,

a driving unit to which the brightness control signal is input; and

It is a transistor of a second type different from the first type and is driven by the driving unit, a first terminal is electrically connected to the driving unit, a second terminal is electrically connected to the power source, and a third terminal is electrically connected to the second terminal. A lighting device comprising a first light emitting means, the second light emitting means, and a third switch electrically connected to the pull-up resistor, respectively.
5. The method according to claim 4,

The color temperature control signal is a PWM signal having a first frequency,

wherein the brightness control signal is a PWM signal having a second frequency that is higher than the first frequency.
The method according to claim 1,

The lighting device is

a second signal controller for generating a brightness control signal for adjusting the brightness of the first light emitting means and the second light emitting means; and

A third transistor that is a transistor, is connected in series with the first switch between the first switch and the ground, and is provided to adjust the brightness of the first light emitting means and the second light emitting means according to the input brightness control signal A lighting device, further comprising a switch.
7. The method of claim 6,

The first switch and the second switch are transistors of a first type;

The third switch is a transistor of the first type,

a first terminal is electrically connected to the second signal control unit, a second terminal is electrically connected to a third terminal of the first switch, and a third terminal is electrically connected to the ground;

and a third terminal of the second switch is electrically connected to a second terminal of the third switch.
8. The method of claim 7,

The color temperature control signal is a PWM signal having a first frequency,

wherein the brightness control signal is a PWM signal having a second frequency that is higher than the first frequency.
a first signal controller for generating a color temperature control signal for adjusting the color temperature of the first light emitting means and the second light emitting means, each of which has one end electrically connected to a power source;

a first switch comprising a transistor, a first terminal electrically connected to the first signal controller, a second terminal electrically connected to the other end of the first light emitting means, and a third terminal electrically connected to a ground;

a pull-up resistor having one end electrically connected to the power source and the other end electrically connected to the second terminal of the first switch; and

a transistor, wherein a first terminal is electrically connected to a second terminal of the first switch, a second terminal is electrically connected to the other end of the second light emitting means, and a third terminal is electrically connected to a ground including a switch;

The first terminal of the second switch is electrically connected to the other end of the pull-up resistor,

The color temperature control signal is a PWM (Pulse Width Modulation) signal, and the PWM signal is input to a first terminal of the first switch,

During the ON operation of the first switch, the second switch is turned OFF while the first terminal of the second switch is electrically connected to the ground,

When the first switch is OFF, the second switch by the pull-up resistor is provided to operate ON, the lighting control device.