KR20230090813A - Led lighting fixture with toning and dimming - Google Patents

Abstract

Provided is an LED lighting device capable of color modulation using two power supply lines. The LED lighting device is connected between an LED driving circuit that generates an LED driving signal having negative and positive voltages having different phases from a power supply voltage, and a first node and a second node, and is driven by receiving the LED driving signal. A plurality of first light emitting diodes including a light emitting unit, wherein the light emitting unit has an anode connected in the direction of the first node, a cathode connected in the direction of the second node, and turned on to emit light of a first color, a cathode is connected in the direction of the first node, an anode is connected in the direction of the second node, and includes a plurality of second light emitting diodes turned on to emit light of a second color different from the first color, wherein the plurality of The first light emitting diode and the plurality of second light emitting diodes are driven alternately to be turned on by the LED driving signal.

Description

LED lighting device having a dimming function using two power lines {LED LIGHTING FIXTURE WITH TONING AND DIMMING}

The present invention relates to an LED lighting device having a dimming function using two power wires supplying positive and negative voltages, and to an LED driving circuit for driving the LED lighting device, and more specifically, to an LED lighting device in which the connection directions are opposite to each other. LED lighting device having a color modulation function with a relatively simple power connection structure and a plurality of multiple LED group lights connected without any additional device It relates to an LED driving circuit that can be used by

Light Emitting Diodes (LEDs) are used as light sources in various fields because they can provide high-intensity lighting even with low power consumption. Due to the above characteristics, LEDs are in the limelight as lighting fixtures that can replace conventional incandescent or fluorescent lights.

A recent LED lighting device is used as so-called emotional lighting having a color control function for adjusting brightness and color temperature by receiving a control signal from the outside. However, in order to implement such a color tone control function, in the case of a wired control method, three or more than four power wires connected from a power source to a light emitting portion are required. In other words, to implement emotional lighting, control signals and power are supplied to the LED lights using 2 AC power supply wires and 3 minimum signal lines, and the control signal supplied from the 3 signal lines by embedding a power supply device inside the LED light The circuit controlled by is embedded in each LED light. Alternatively, there is a method of driving the receiver LED light by embedding a control signal into a control circuit and supplying control power to the DC power supply, but this requires at least three power wires.

In addition, in the case of the wireless control method, it is necessary to mount a power supply and a separate receiving module on one LED lighting fixture in order to use a remote control or application on a smartphone, increasing the installation cost and difficulty of designing the interior space of the LED lighting fixture. may be the main cause of

A technical problem to be solved by the present invention is to provide an LED driving circuit that efficiently drives two groups of light emitting diodes capable of color modulation by alternately applying positive and negative voltages to each other using two power lines. .

A technical problem to be solved by the present invention is to provide an LED lighting fixture that performs a color modulation function by applying a negative voltage and a positive voltage to two groups of light emitting diodes alternately.

Another technical problem to be solved by the present invention is to provide an LED driving circuit incorporating a wired or wireless communication module to perform a color modulation function.

Another technical problem to be solved by the present invention is to provide an LED lighting device having the above-described LED driving circuit.

The technical problems of the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the description below.

An LED lighting device having a color modulation function according to some embodiments of the present invention for solving the above-described technical problems includes an LED driving circuit for generating an LED driving signal having a positive voltage and a negative voltage from an input power supply; And a light emitting unit connected between a first node and a second node and receiving and driving the LED driving signal, wherein the light emitting unit has an anode connected in the direction of the first node and a cathode connected in the direction of the second node. connected, a plurality of first light emitting diodes turned on to emit light of a first color, a cathode connected to the first node, an anode connected to the second node, and turned on to emit light of a first color It includes a plurality of second light emitting diodes emitting light of a different second color, and the plurality of first light emitting diodes and the plurality of second light emitting diodes are driven to emit light alternately by the LED driving signal. to be characterized

In some embodiments of the present invention, the input power supply has different positive and negative voltages, and the LED driving circuit receives a control signal from a light emitting control unit and a positive neutral voltage exists through a plurality of transistors. A voltage of and a negative voltage are alternately output, but a forward bias voltage is provided from the first node to the second node at a first time point, and a forward bias voltage is provided from the second node to the first node at a second time point. It may be characterized in providing a voltage and operating at one frequency.

In some embodiments of the present invention, the LED driving circuit receives a control signal from the light emitting control unit and outputs a neutral voltage through a plurality of transistors and alternately outputs continuous positive and negative voltages, A forward bias voltage is provided from the first node to the second node, a forward bias voltage is provided from the second node to the first node at a second time point, and a continuous positive voltage and a continuous negative voltage are provided. may be characterized in that it operates with high-frequency PWM and has a frequency of low-frequency PWM at the time of alternating with each other.

In some embodiments of the present invention, the LED driving circuit receives a control signal from the light emitting controller and alternately outputs a positive voltage and a negative voltage in which a neutral voltage exists through a plurality of transistors, and the first time point A forward bias voltage may be provided from node 1 to the second node, a forward bias voltage may be provided from the second node to the first node at a second time point, and operated at one frequency.

In some embodiments of the present invention, the LED driving circuit, a wired/wireless communication module for generating a PWM control signal from a control input provided from the outside, a light emitting control unit for generating first and second switching signals from the PWM control signal, the A first transistor turned on by a first switching signal to provide the power voltage to the plurality of first light emitting diodes to turn them on, and a first transistor turned on by the second switching signal to transmit the power voltage to the plurality of second light emitting diodes It may include a second transistor to be turned on by providing to.

In some embodiments of the present invention, the LED driving circuit may adjust the color temperature and brightness of the light of the third color emitted by the light emitting unit by adjusting the duty ratio of the first switching signal and the duty ratio of the second switching signal. .

In some embodiments of the present invention, the light emitting controller may set a dead time such that the first switching signal and the second switching signal do not become turn-on voltages at the same time.

In some embodiments of the present invention, the LED driving circuit, a wired/wireless communication module for generating a PWM control signal from a control input provided from the outside, a light emitting controller for generating first to fourth switching signals from the PWM control signal, a first A first transistor and a fourth transistor turned on by the first switching signal and the fourth switching signal at a time to provide the power supply voltage to the plurality of first light emitting diodes to turn them on, and the third switching at a second time and a second transistor and a third transistor turned on by a signal and a second switching signal to provide the power supply voltage to the plurality of second light emitting diodes to turn them on.

In some embodiments of the present invention, a first transistor turned on by the first driving control signal to provide the first LED driving signal to the first node, and a first transistor turned on by the fourth driving control signal to provide the fourth LED. A fourth transistor for providing a driving signal to the first node, a second transistor turned on by the second driving control signal and providing the second LED driving signal to the second node, and a third driving control signal A third transistor turned on to provide the third LED driving signal to the second node may be further included.

In some embodiments of the present invention, the light emitting controller adjusts a duty ratio between the first switching signal and the fourth switching signal and a duty ratio between the third switching signal and the second switching signal to adjust the plurality of light emitting diodes. It is possible to adjust the color temperature and brightness of the third color light emitted.

In some embodiments of the present invention, the light emitting controller may set a dead time so that the first switching signal, the fourth switching signal, the third switching signal, and the second switching signal do not become turn-on voltages at the same time.

An LED lighting device according to some embodiments of the present invention for solving the above-described technical problem includes an LED driving circuit generating pulse output power from a power supply voltage; and a light emitting unit connected between a first node and a second node and driven by receiving the pulse output power, wherein the light emitting unit has an anode connected in the direction of the first node and a cathode connected in the direction of the second node. connected, a plurality of first light emitting diodes turned on to emit light of a first color, a cathode connected to the first node, an anode connected to the second node, and turned on to emit light of a first color It includes a plurality of second light emitting diodes emitting light of a different second color, wherein the first light emitting diode is turned on by a forward biased pulse output power supply at a first time point to emit light, and after the first time point, the second light emitting diode emits light. The second light emitting diode is turned off by the reverse bias pulse output power at the first time, and the second light emitting diode is turned off by the reverse bias pulse output power at the first time, and by the forward bias pulse output power at the second time. turns on and emits light.

Details of other embodiments are included in the detailed description and drawings.

An LED driving circuit according to an embodiment of the present invention according to some embodiments of the present invention, and an LED lighting device including the same require only the connection of two lines connecting light emitting units to implement LED color modulation and dimming, and thus are relatively simple to install. can do. That is, there is an advantage in that the LED lighting device of the present invention can be installed without separate wiring work even when only two conventional AC power supplies are installed.

In addition, the use of raw materials and installation costs are significantly reduced by installing new wiring or using existing wiring when installing lighting, and unnecessary raw materials are used when manufacturing LED luminaires because the power supply and wired/wireless communication circuit included in the LED luminaire are not included. It can be configured simply by not doing it, and the cost of raw materials is significantly reduced, which will be useful for reducing carbon and saving energy.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description below.

1A and 1B are circuit diagrams for explaining the configuration of an LED lighting device having a color control function according to some embodiments of the present invention.
2 is a circuit diagram for explaining an exemplary configuration of an LED driving circuit included in an LED lighting device having a color modulation function according to some embodiments of the present invention.
3A is a timing diagram of LED driving signals generated by the LED driving circuit of FIG. 2 .
3b and 3c are exemplary timing diagrams of the pulsed output power supply of the LED driving circuit of FIG. 2 .
4 is a circuit diagram for explaining an exemplary configuration of an LED driving circuit included in an LED lighting device having a color modulation function according to another embodiment of the present invention.
5 is a timing diagram of LED driving signals generated by the LED driving circuit of FIG. 4 .
FIG. 6 is an enlarged view of a portion of the timing diagram of the LED driving signal of FIG. 5 .
7A and 7B are exemplary timing diagrams of the pulsed output power supply of the LED driving circuit of FIG. 4 .
8 is another embodiment of a timing diagram of an LED driving signal generated by the LED driving circuit of FIG. 4 .
9A and 9B are exemplary timing diagrams of the pulse output power of the LED driving circuit 100 of the LED driving circuit of FIG. 4 .

Advantages and features of the present invention, and methods of achieving them, will become clear with reference to the detailed description of the following embodiments taken in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various different forms, only these embodiments make the disclosure of the present invention complete, and common knowledge in the art to which the present invention belongs. It is provided to fully inform the holder of the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numbers designate like elements throughout the specification.

A component is said to be "connected to" or "coupled to" another component when it is directly connected or coupled to the other component or through another component in between. include all cases. On the other hand, when one component is referred to as “directly connected to” or “directly coupled to” another component, it indicates that another component is not intervened. “And/or” includes each and every combination of one or more of the recited items.

Terminology used herein is for describing the embodiments and is not intended to limit the present invention. In this specification, singular forms also include plural forms unless specifically stated otherwise in a phrase. As used herein, "comprises" and/or "comprising" means that a stated component, step, operation, and/or element is present in the presence of one or more other components, steps, operations, and/or elements. or do not rule out additions.

Although first, second, etc. are used to describe various constituent elements, these constituent elements are not limited by these terms, of course. These terms are only used to distinguish one component from another. Accordingly, it goes without saying that the first component mentioned below may also be the second component within the technical spirit of the present invention.

Unless otherwise defined, all terms (including technical and scientific terms) used in this specification may be used in a meaning commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, terms defined in commonly used dictionaries are not interpreted ideally or excessively unless explicitly specifically defined.

1A is a circuit diagram for explaining the configuration of an LED lighting device having a color modulation function according to some embodiments of the present invention.

Referring to FIG. 1A , an LED lighting fixture 1 according to some embodiments of the present invention may include an LED driving circuit 100 and a light emitting unit 200 .

The LED driving circuit 100 may be connected to a first light emitting unit 210 and a second light emitting unit 220 connected in parallel between the first node N1 and the second node N2. The LED driving circuit 100 may provide LED driving pulse power to drive the first light emitting unit 210 and the second light emitting unit 220 .

The first light emitting unit 210 and the second light emitting unit 220 may include a plurality of light emitting diodes having opposite connection directions. The first light emitting unit 210 includes a plurality of first light emitting diodes 215, each of which has an anode connected in the direction of the first node N1, and the second light emitting unit 220 has each anode connected to the second node ( N2) may include a plurality of second light emitting diodes 225 connected in the direction.

As shown in FIG. 1A , the light emitting unit 200 may include a plurality of first light emitting units 210 and a plurality of second light emitting units 220 , respectively. However, the present invention is not limited thereto, and a configuration in which only one each of the first light emitting part 210 and the second light emitting part 220 is connected to the LED driving circuit 100 is also possible.

Accordingly, one or more first light emitting units 210 connected in a forward direction (from top to bottom in FIG. 1A) between the first node N1 and the second node N2, and in a reverse direction (from bottom to top in FIG. 1A) At least one or more second light emitting units 220 connected to may be connected in parallel with the LED driving circuit 100 . Also, as shown in FIG. 1B , at least one first light emitting part 210 and one or more second light emitting parts 220 may be connected in series between the first node N1 and the second node N2 .

The plurality of first light emitting diodes 215 include a plurality of light emitting diodes whose anodes are serially connected in the direction of the first node N1, and can operate to emit light of a first color by being turned on by receiving pulse driving power. there is. A resistor R1 may be connected between the plurality of first light emitting diodes 215 and the first node N1, and between the plurality of first light emitting diodes 215 and the second node N2, the first light emitting diode ( A diode 216 may be connected to 215 to prevent damage due to reverse voltage.

The plurality of second light emitting diodes 225 include a plurality of light emitting diodes whose anodes are serially connected in the direction of the second node N2, and are turned on by receiving pulse driving power to emit light of a second color different from the first color. can operate to emit. A resistor R2 may be connected between the plurality of second light emitting diodes 225 and the first node N2, and between the plurality of second light emitting diodes 225 and the first node N1, the second light emitting diode ( A diode 226 may be connected to 225 to prevent damage due to reverse voltage.

Since the first light emitting unit 210 and the second light emitting unit 220 are configured as described above, the first light emitting unit 210 and the second light emitting unit 220 are driven by pulses provided from the LED driving circuit 100. Depending on the power source, they can emit light alternately.

That is, when the pulse driving power supplied from the LED driving circuit 100 applies a forward bias from the first node N1 to the second node N2, the first light emitting unit 210 is turned on and emits light. 2 The light emitting unit 220 may be turned off. Conversely, when the pulse driving power supplied from the LED driving circuit 100 applies a forward bias from the second node N2 to the first node N1, the second light emitting unit 220 is turned on to emit light, and the first The light emitting unit 210 may be turned off.

Due to the structure of the LED lighting device 1, the duty ratio of the LED driving signals provided to the first light emitting unit 210 and the second light emitting unit 220 is adjusted to adjust the color of the light emitting unit 200. Illumination can be adjusted. For example, the first light emitting unit 210 is turned on to include a warm white LED (LED) emitting light of a first color having a low color temperature, and the second light emitting unit 220 is turned on to emit light of a first color. It may be configured as a cool white LED (LED) that emits light of a second color having a high color temperature. The LED driving circuit 100 receives an external color temperature and brightness control signal for adjusting the color temperature and brightness, and determines the duty ratio of the signal for turning on the first light emitting unit 210 and the second light emitting unit 220, respectively. By adjusting, the color temperature and brightness of the light emitting unit 200 can be adjusted.

An example of the LED driving circuit 100 providing the LED driving signal to the light emitting unit 200 will be described with reference to FIGS. 2 and 3 .

2 is a circuit diagram for explaining an exemplary configuration of an LED driving circuit included in an LED lighting device having a color modulation function according to some embodiments of the present invention. However, the internal circuit configuration of the LED driving circuit 100 described using FIG. 2 is only an exemplary configuration of the LED driving circuit having the timing diagram of FIG. 3, and the present invention is not limited thereto.

Referring to FIG. 2 , the LED driving circuit 100 included in the LED lighting device having a color modulation function according to some embodiments of the present invention includes a DC-DC converter 110, a wired/wireless communication module 120, a light emitting controller ( 130), a power supply unit 140, a first transistor Q1 and a second transistor Q2.

As shown in FIG. 2, in the light emitting unit 200, at least one first light emitting unit 210 and at least one or more second light emitting units 220 may be connected in parallel. Although not separately shown, as shown in FIG. 1B The light emitting unit 200 may also be composed of one or more first light emitting units 210 and one or more second light emitting units 220 connected in series.

The DC-DC converter 110 may transform the power supply voltage provided from the power supply unit 140 and provide it to the wired/wireless communication module 120 and the light emitting controller 130 .

The wired/wireless communication module 120 may receive a control signal of the LED driving circuit 100 from a user. The wired/wireless communication module 120 may be wired from an input unit such as at least one switch through a connector to receive inputs for on/off operation, color temperature control, and brightness control of the LED driving circuit 100. there is. Alternatively, the wired/wireless communication module 120 is connected wirelessly through Wi-Fi, Bluetooth, RF signals, etc. from an input means including at least one switch to turn on/off the LED driving circuit 100, An input for color temperature control and brightness control may be provided.

The power supply unit 140 supplies power supply voltage to the DC-DC converter 110, while driving the LED to the light emitting unit 200 through the first and second transistors Q1 and Q2 by a control signal from the light emission control unit 130. power can be provided.

The power supply unit 140 may configure a power supply device having a positive voltage and a power supply device having a negative voltage in series and provide the ground voltage GND as an input power supply device of the LED driving circuit.

The wired/wireless communication module 120 may provide PWM control signals CH1 and CH2 to the light emitting controller 130 in response to input provided through wired/wireless communication. The light emitting controller 130 generates a first switching signal HO1 and a second switching signal LO1 based on the input PWM control signals CH1 and CH2, and the first transistor Q1 and the second transistor ( It can be provided as the gate terminal of Q2). Operations of the first switching signal HO1 and the second switching signal LO1 and the first and second transistors Q1 and Q2 receiving the same will be described in more detail with reference to FIGS. 3A to 3C .

3A is a timing diagram of LED driving signals generated by the LED driving circuit of FIG. 2 .

Referring to FIGS. 2 and 3A , the first switching signal HO1 and the second switching signal LO1 have phases opposite to each other and are provided to gate terminals of the first transistor Q1 and the second transistor Q2. It can be. For example, at time t ₁ , the first switching signal HO1 may rise to the turn-on voltage V _H , and the second switching signal LO1 may fall to the turn-off voltage V _L .

Here, the turn-off voltage (V _L ) may be 0V, but is not limited thereto. At time t ₁ , the first transistor Q1 is turned on by the first switching signal HO1 to provide a positive power supply voltage to the first node N1. Accordingly, a forward bias may be applied to the first light emitting unit 210 so that current may flow. At this time, the first light emitting unit 210 may be turned on to emit light of a first color. Meanwhile, since a reverse bias is applied to the second light emitting unit 220, current does not flow, and at this time, the plurality of light emitting diodes 225 included in the second light emitting unit 220 may be turned off.

Subsequently, at time t ₂ , the first switching signal HO1 may drop to the turn-off voltage V _L , and the second switching signal LO1 may rise to the turn-on voltage V _H . At time t ₂ , the second transistor Q2 is turned on by the second switching signal LO1 to provide a negative power supply voltage to the second node N2 . Accordingly, a forward bias may be applied to the second light emitting unit 220 so that current may flow, and the second light emitting unit 220 may be turned on to emit light of a second color.

In this way, when the first switching signal HO1 and the second switching signal LO1 are switched, the first transistor Q1 and the second transistor Q2 are simultaneously turned on due to the response speed of the transistor, which is a switching element. In order to prevent the first switching signal HO1 and the second switching signal LO1 from being turned on at the same time, a dead time, which is a turn-off period, may be set.

The voltage applied to the light emitting unit 200, that is, the pulse output power provided between the first node N1 and the second node N2 is taken as the input voltage V _IN of the light emitting unit 200 and is shown in the graph of FIG. 3A. indicated. The input voltage V _IN of the light emitting unit 200 may switch between the voltage V+ and the voltage V− in response to the switching period of the first switching signal HO1. As can be seen from the value of the input voltage (V _IN ) of the light emitting unit 200, the forward bias between the first node N1 and the second node N2 is between time t ₁ and t ₂ and time t ₃ and During t ₄ , the first plurality of light emitting diodes 215 of the first light emitting unit 210 are turned on, and the plurality of second light emitting diodes 225 of the second light emitting unit 220 are turned on during the remaining time. .

The first switching signal H01 and the second switching signal LO1 may be switched to have, for example, a high-frequency PWM frequency. The light emitting control unit 130 controls the color temperature and brightness of the light emitted by the light emitting unit 200 by adjusting the duty ratios of the first switching signal H01 and the second switching signal LO1, which have opposite phases. can

For example, the first light emitting unit 210 is turned on to include an LED emitting light of a first color having a lower color temperature, and the second light emitting unit 220 is turned on to include a second color temperature higher than the first color. It is assumed that a case including an LED emitting light of a color is included. The light emitting controller 130 may indicate a low color temperature of light emitted from the light emitting unit 200 by increasing the duty ratio of the first switching signal H01 (decreasing the duty ratio of the second switching signal LO1). In addition, the light emitting control unit 130 may exhibit a high color temperature of the light emitted from the light emitting unit 200 by decreasing the duty ratio of the first switching signal H01 (by increasing the duty ratio of the second switching signal LO1) can be implemented.

As described above, the LED driving circuit 100 according to an embodiment of the present invention and the LED lighting device 1 including the same include the light emitting unit 200, the first node N1, and the second node for realizing LED color modulation. Installation can be relatively simple by requiring only the connection of two lines connecting (N2). That is, for example, there is an advantage in that the LED lighting device 1 of the present invention can be installed without separate wiring work even when only two wires of general AC power are installed in the conventional track housing.

In addition, the duty ratio of the first switching signal HO1 and the second switching signal LO1 provided to the first and second transistors Q1 and Q2 is adjusted to adjust the brightness of the light emitted from the light emitting unit 200. By doing so, light control using the first light emitting unit 210 and the second light emitting unit 220 can be implemented.

In addition, the LED driving circuit 100 includes a wired/wireless communication module 120 receiving a control signal for adjusting brightness or color temperature from a user, and the light emitting unit 200 based on the control signal received from the wired/wireless communication module 120. ) can generate an LED driving signal for adjusting the color temperature of the light emitted from it. That is, since the control signal based on the user input is located on the side of the LED driving circuit 100 instead of the light emitting unit 200, there is an effect of reducing the volume and weight of the light emitting unit 200, and due to space utilization A desired design configuration may be easily achieved. In addition, a separate driving circuit for color and dimming is not required by utilizing lamps (the first light emitting part 210 and the second light emitting part 220 of FIGS. 1A and 1B) connected in series and parallel.

3B and 3C are exemplary timing diagrams of the pulsed output power supply of the LED driving circuit 100 of FIG. 2 .

Referring first to FIG. 3B, a timing diagram in which the pulse output power of the LED driving circuit 100 operates with a duty ratio of 50% by one frequency is shown, and the pulse output power is negative voltage (V-) and It is shown to fluctuate between positive voltages (V+).

Referring to FIG. 3C, a timing diagram in which the pulse output power of the LED driving circuit 100 operates with a duty ratio of 30% by one frequency is shown, and the pulse output power is a negative voltage (V-) and a positive voltage (V-). It is shown to fluctuate between the voltage (V+) of

The pulse output power supply exemplarily shown in FIGS. 3B and 3C may realize color and dimming of the light emitting unit 200 by supplying power having the same or different duty ratios at one frequency. This duty ratio may be the same or different between the case where the pulse output power has a positive voltage (V+) and the case where it has a negative voltage (V-). Of course, the timing diagrams shown in FIGS. 3B and 3C are only exemplary configurations of the pulse output power of the LED driving circuit 100, and the present invention is not limited thereto.

At this time, the pulse output power may be driven to include a dead time as illustrated in order to eliminate a section in which the switching element is simultaneously turned on due to the response speed of the switching element.

4 is a circuit diagram for explaining an exemplary configuration of an LED driving circuit included in an LED lighting device having a color modulation function according to another embodiment of the present invention.

Referring to FIG. 4 , the LED driving circuit 300 included in the lighting device 2 having a color modulation function according to some other embodiments of the present invention includes a DC-DC converter 310, a wired/wireless communication module 320, It may include a light emitting controller 330 and first to fourth transistors Q1 to Q4.

The DC-DC converter 310 may transform the power voltage provided from the power terminal 340 and provide the converted power voltage to the wired/wireless communication module 320 and the light emitting controller 330 . In FIG. 4, it is illustrated that a power supply voltage of 24V is exemplarily supplied to the LED lighting device 2, but this is exemplary, and the present invention is not limited thereto.

The wired/wireless communication module 320 may receive a control signal of the LED lighting device 2 from a user's switch operation. The wired/wireless communication module 320 may be wired from an input unit such as at least one switch through a connector to receive inputs for on/off operation, color temperature control, and brightness control of the LED lighting device 2. there is. Alternatively, the wired/wireless communication module 320 is wirelessly connected from an input unit such as at least one switch through Wi-Fi, Bluetooth, RF signals, etc. to turn on/off the LED lighting device 2, adjust color temperature, An input for adjusting brightness may be provided.

The wired/wireless communication module 320 may provide PWM control signals CH1 and CH2 to the light emitting controller 330 in response to input provided through wired/wireless communication. The PWM control signals CH1 and CH2 may include, for example, square wave signals having opposite phases to each other.

The light emitting controller 330 may generate four switching signals HO1 , LO1 , HO2 , and LO2 based on the input PWM control signals CH1 and CH2 . The first switching signal HO1 and the fourth switching signal LO2 are square wave signals having the same phase, and the third switching signal HO2 and the second switching signal LO1 are square wave signals having the same phase.

For example, the first switching signal HO1 and the fourth switching signal LO2 may perform PWM driving that repeatedly turns on/off while the first PWM control signal CH1 is in a high period. In addition, the third switching signal HO2 and the fourth switching signal LO1 may perform PWM driving that repeatedly turns on/off while the second PWM control signal CH2 is in a high period.

The first switching signal HO1 is a gate terminal of the first transistor Q1, the second switching signal LO1 is a gate terminal of the second transistor Q2, and the third switching signal HO2 is a third transistor ( As the gate terminal of Q3, the fourth switching signal LO2 may be provided to the gate terminal of the fourth transistor Q4.

The first transistor Q1 is turned on by the first switching signal HO1, and the fourth transistor Q4 is turned on by the fourth switching signal LO2 to provide the power supply voltage to the first node N1. can do. As described above, the first switching signal HO1 and the fourth switching signal LO2 have the same phase, and the first switching signal HO1 and the fourth switching signal LO2 are connected to the first node N1. A positive supply voltage may be provided to coincide with the triggering period.

The third transistor Q3 is turned on by the third switching signal HO2 and the second transistor Q2 is turned on by the second switching signal LO1 to provide the power supply voltage to the second node N2. can As described above, since the phases of the third switching signal HO2 and the second switching signal LO1 are opposite to each other, the third switching signal HO2 and the second switching signal LO1 are connected to the second node N2. A negative power supply voltage may be provided to coincide with the triggering period.

Operations of the first to fourth switching signals HO1 , LO1 , HO2 , and LO2 and the first to fourth transistors Q1 to Q4 receiving the signals will be described in more detail with reference to FIGS. 5A and 6 .

FIG. 5 is an embodiment of a timing diagram of an LED driving signal generated by the LED driving circuit of FIG. 4 , and FIG. 6 is an enlarged view of a portion of the timing diagram of the LED driving signal of FIG. 5 .

4 to 5, the first switching signal HO1 and the fourth switching signal LO2 have the same phase and are provided to the gate terminals of the first transistor Q1 and the fourth transistor Q4. can The first switching signal HO1 and the fourth switching signal LO2 maintain a positive output voltage by driving the high-frequency PWM from time t ₁ to time t ₂ , and from time t ₂ to time t ₃ the third transistor Q3 ) and the second transistor Q2 drive the high-frequency PWM to maintain a negative output voltage. PWM driving from time t ₁ to time t ₂ and from time t ₂ to time t ₃ may be driven with a duty ratio based on a dimming level corresponding to a user's input received by the wired/wireless communication module 320 . In addition, by continuously driving the high-frequency PWM from time t ₁ to t ₂ according to the duty ratio provided by the light emitting controller 330 and continuously driving the high-frequency PWM from time t ₂ to t ₃ , a positive output voltage from time t ₁ to t ₂ and maintain a negative output voltage from time t ₂ to t ₃ .

At the time when the high-frequency PWM driving of the third switching signal HO2 and the second switching signal LO1 continuously ends and the high-frequency PWM driving of the first switching signal HO1 and the fourth switching signal LO2 starts, the th A turn-off dead time may be set to prevent the first and fourth switching transistors Q1 and Q4 from being turned on at the same time.

In FIG. 6 , a graph of the first switching signal H01 and the fourth switching signal LO2 from time t1' to time t2' is shown enlarged. The first switching signal H01 and the fourth switching signal LO2 may drive high-frequency PWM based on a predetermined duty ratio. By adjusting the duty ratio of each high-frequency PWM drive, a color tone control function can be implemented.

At times t ₃ ′ and t ₄ ′, driving of the first switching signal HO1 and the fourth switching signal LO2 at times t _{1 ′} and t _{2 ′} may be repeated.

Referring back to FIGS. 4 and 5 , the third switching signal HO2 and the second switching signal LO1 have the same phase and are provided to the gate terminals of the third transistor Q3 and the second transistor Q2. can The third switching signal HO2 and the second switching signal LO1 continuously drive the high-frequency PWM from time t ₂ to time t ₃ to maintain a negative output voltage, and from time t ₃ to time t ₄ the first transistor ( Q1) and the fourth transistor Q4 are continuously driven with high-frequency PWM to maintain a positive output voltage. High-frequency PWM driving from time t ₂ to time t ₃ and from time t ₃ to time t ₄ may be driven with a duty ratio based on a dimming level corresponding to a user's input received by the wired/wireless communication module 320 . In addition, by continuously driving high-frequency PWM from time t2 to t3 according to the duty ratio provided by the light emitting controller 330 and continuously driving high-frequency PWM from time t ₃ to t ₄ , a negative output voltage is maintained from time t2 to t3, and time A positive output voltage can be maintained from t3 to t4.

As such, the point at which the high-frequency PWM driving of the third switching signal HO2 and the second switching signal LO1 ends and the high-frequency PWM driving of the first switching signal HO1 and the fourth switching signal LO2 starts. In order to prevent the first and fourth switching transistors Q1 and Q4 and the third and second switching transistors Q3 and Q2 from being turned on at the same time, a dead time for turning off may be set.

In the period from time t ₁ to time t ₂ , the first transistor Q1 and the second transistor Q4 are turned on and off by continuous high-frequency PWM according to the first switching signal HO1 and the fourth switching signal LO2. The power supply voltage, which is a positive voltage, may be repeatedly provided to the first node N1 during the low frequency period. Accordingly, a forward bias may be applied to the first light emitting unit 210 so that current may flow, and the first light emitting unit 210 may be turned on to emit light of a first color. Meanwhile, since a reverse bias is applied to the second light emitting unit 220, current does not flow, and the plurality of light emitting diodes 225 included in the second light emitting unit 220 may be turned off.

Subsequently, in the period from time t ₂ to t ₃ , the first switching signal HO1 and the fourth switching signal LO2 fall to the turn-off voltage V _L , and the third switching signal HO1 and the second switching signal LO1 ) may be repeatedly turned on and off with a continuous high-frequency PWM to provide a negative (-) power supply voltage to the second node N2 during the low-frequency period. Accordingly, a forward bias may be applied to the second light emitting unit 220 so that current may flow, and the second light emitting unit 220 may be turned on to emit light of a second color.

In this way, the first and fourth switching signals H01 and LO2 and the third and second switching signals H02 and LO1 operate, for example, as high-frequency PWM that continuously operates, and the continuously operated high-frequency PWM switching ends. By repeating, it can be driven with low-frequency PWM switching. The light emitting controller 330 may adjust the color temperature and brightness of light emitted by the light emitting unit 200 by adjusting the duty ratio of each switching signal.

For example, the first light emitting unit 210 is turned on to include an LED emitting light of a first color having a low color temperature, and the second light emitting unit 220 is turned on to include an LED emitting light of a first color having a higher color temperature than the first color. It is assumed that LEDs emitting light of two colors are included. The light emitting controller 130 increases the duty ratios of the first and fourth switching signals HO1 and LO2 and decreases the duty ratios of the third and second switching signals H02 and L01 to emit light emitted from the light emitting unit 200. The light may have a low color temperature. In addition, the light emitting controller 330 reduces the duty ratio of the first and fourth switching signals H01 and L02 and increases the duty ratio of the third and second switching signals H02 and L01 so that the light emitting unit 200 The emitted light can have a high color temperature. In addition, the light emitting controller 130 increases the brightness by increasing the duty ratio of the first to fourth switching signals HO1, LO1, HO2, and LO2, and the first to fourth switching signals HO1, LO1, HO2, and LO2 ), the brightness can be reduced by reducing the duty ratio.

7A and 7B are exemplary timing diagrams of the pulsed output power supply of the LED driving circuit 300 of FIG. 4 .

Referring to Figure 7a, it is shown that the pulse output power of the LED driving circuit 300 operates by two frequencies. The two frequencies consist of a low frequency and a high frequency, and the low frequency operates with a duty ratio of 50% and has negative voltage (V-) and positive voltage (V+) values. At this time, due to the response speed of the first to fourth transistors Q1 to Q4 for outputting pulse output power, a dead time may be included as shown in order to eliminate a section in which they are simultaneously turned on. In addition, the illustrated pulse output power supply can also operate as a high frequency power supply having a duty ratio of 50% in a positive voltage range and a negative voltage range. A dead time may be included to eliminate a period in which the first to fourth transistors Q1 to Q4 are simultaneously turned on due to the switching response speed of the first to fourth transistors Q1 to Q4 in the high frequency period.

Referring to Figure 7b, it is shown that the pulse output power of the LED driving circuit 100 operates by two frequencies. The two frequencies consist of a low frequency and a high frequency, and the low frequency operates with a duty ratio of 50% and has negative voltage (V-) and positive voltage (V+) values. At this time, due to the response speed of the first to fourth transistors Q1 to Q4 for outputting pulse output power, a dead time may be included as shown in order to eliminate a section in which they are simultaneously turned on. In addition, the illustrated pulse output power supply can also operate as a high-frequency power supply having a duty ratio of 30% in a positive voltage range and a negative voltage range. A dead time may be included to eliminate a period in which the first to fourth transistors Q1 to Q4 are simultaneously turned on due to the switching response speed of the first to fourth transistors Q1 to Q4 in the high frequency period.

Like the pulse output power having timing diagrams shown in FIGS. 7A and 7B , the color toning and dimming functions of the light emitting unit 200 may be implemented by supplying pulse power having different duty ratios by two frequencies. That is, the duty ratio of the low frequency may be fixed and implemented with a positive pulse voltage and a negative pulse voltage. At this time, the values of the positive pulse voltage and the negative pulse voltage may be the same, but are not limited thereto. In addition, a high-frequency PWM operation is performed in a low-frequency configuration to adjust a high-frequency duty ratio to implement a color modulation function of the light emitting unit 200 . The switching transistors Q1 and Q4 may implement a positive voltage by continuously performing a high-frequency PWM operation, and the switching transistors Q3 and Q2 may implement a negative voltage by continuously performing a high-frequency PWM operation.

8 is another embodiment of a timing diagram of an LED driving signal generated by the LED driving circuit of FIG. 4 .

Referring to FIGS. 4 and 8 , the first switching signal HO1 and the fourth switching signal LO2 may have the same phase and be provided to gate terminals of the first transistor Q1 and the fourth transistor Q4. there is. The first switching signal HO1 and the fourth switching signal LO2 represent a positive output voltage by performing high-frequency PWM driving from time t1 to time t2, and from time t2 to time t3, the third transistor Q3 and the second transistor (Q2) is driven with high-frequency PWM, resulting in a negative output voltage. One period of high frequency control may be performed during the turn-off voltage (VL) and turn-on voltage (VH) intervals, respectively. From time t1 to time t2 and from t2 to t3, the PWM drive may be driven with a duty ratio based on the dimming level corresponding to the user's input received by the wired/wireless communication module 320 . In addition, according to the duty ratio provided by the light emitting control unit 330, it is driven with high-frequency PWM from time t1 to t2 and driven with high-frequency PWM from t2 to t3 to maintain positive and negative voltages from time t1 to t2 and from t2 to t3, respectively. can

As such, when the first switching signal HO1 and the fourth switching signal LO2 are switched, and the first and fourth transistors Q1 and Q4 are turned on/off, the first switching signal HO1 and the fourth transistor Q4 are turned on and off. A dead time at which the fourth switching signal LO2 is simultaneously turned off may be set. In addition, at the time when the high-frequency PWM driving of the third switching signal HO2 and the second switching signal LO1 ends and the high-frequency PWM driving of the first switching signal HO1 and the fourth switching signal LO2 starts, In order to prevent the first to fourth switching transistors Q1 to Q4 from being simultaneously turned on, a dead time at which the first to fourth switching signals HO1, LO1, HO2, and LO2 are simultaneously turned off may be set. can

In FIG. 8 , the first switching signal H01 and the fourth switching signal LO2 from time t1 to time t2 may drive the high-frequency PWM based on a predetermined duty ratio. It is possible to implement color modulation by adjusting the duty ratio by driving each high-frequency PWM. At times t3 and t4 , driving of the first switching signal HO1 and the fourth switching signal LO2 at times t1 and t2 may be repeated.

The third switching signal HO2 and the second switching signal LO1 have the same phase as each other and may be provided to gate terminals of the third transistor Q3 and the second transistor Q2. The third switching signal HO2 and the second switching signal LO1 perform high-frequency PWM driving from time t2 to time t3 to indicate a negative output voltage, and from time t3 to time t4, the first transistor Q1 and the fourth transistor ( Q4) is driven by high-frequency PWM and shows a positive output voltage. High-frequency control of one cycle may be performed by maintaining the turn-off voltage VL and the turn-on voltage VH, respectively. From time t1 to time t2 and from t2 to t3, the PWM drive may be driven with a duty ratio based on the dimming level corresponding to the user's input received by the wired/wireless communication module 320 . In addition, according to the duty ratio provided by the light emitting control unit 330, it is driven with high-frequency PWM from time t1 to t2 and driven with high-frequency PWM from t2 to t3 to maintain positive and negative voltages from time t1 to t2 and from t2 to t3, respectively. can

As such, when the third switching signal HO2 and the second switching signal LO1 are switched, and the third transistor Q3 and the second transistor Q2 are turned on/off, the third switching signal HO2 and A dead time at which the second switching signal LO1 is simultaneously turned off may be set. In addition, at the time when the high-frequency PWM driving of the third switching signal HO2 and the second switching signal LO1 ends and the high-frequency PWM driving of the first switching signal HO1 and the fourth switching signal LO2 starts, In order to prevent the first to fourth switching transistors Q1 to Q4 from being simultaneously turned on, a dead time at which the first to fourth switching signals HO1, LO1, HO2, and LO2 are simultaneously turned off may be set. can

In the period from time t1 to t2, the first transistor Q1 and the fourth transistor Q4 are turned on at high frequency by the first switching signal HO1 and the fourth switching signal LO2, and the first node N1 ( +) voltage may be provided. Accordingly, a forward bias may be applied to the first light emitting unit 210 so that current may flow, and the first light emitting unit 210 may be turned on to emit light of a first color. Meanwhile, since a reverse bias is applied to the second light emitting unit 220, current does not flow, and the plurality of light emitting diodes 225 included in the second light emitting unit 220 may be turned off.

Subsequently, in the period from time t2 to t3, the first switching signal HO1 and the fourth switching signal LO2 fall to the turn-off voltage VL, and the third switching signal LO1 and the second switching signal LO1 generate a high frequency It is turned on to provide a power supply voltage (-) to the second node N1. Accordingly, a forward bias may be applied to the second light emitting unit 220 so that current may flow, and the second light emitting unit 220 may be turned on to emit light of a second color.

The first switching signal H01, the second switching signal LO1, the third switching signal HO2, and the fourth switching signal LO2 may be switched to have, for example, a high-frequency PWM frequency. The light emitting control unit 130 may adjust the color temperature and brightness of light emitted by the light emitting unit 200 by adjusting the duty ratio of each switching signal.

For example, the first light emitting unit 210 is turned on to include an LED emitting light of a first color having a low color temperature, and the second light emitting unit 220 is turned on to include an LED emitting light of a first color having a higher color temperature than the first color. It is assumed that LEDs emitting light of two colors are included. The light emitting controller 130 increases the duty ratio of the first and fourth switching signals HO1 and LO2 and decreases the duty ratio of the third and second switching signals HO2 and LO1 to emit light emitted from the light emitting unit 200. The light may have a low color temperature. In addition, the light emitting controller 330 reduces the duty ratio of the first and fourth switching signals H01 and LO2 and increases the duty ratio of the third and second switching signals H02 and LO1 to emit light from the light emitting unit 200. The light may have a high color temperature. In addition, the light emitting controller 330 increases the brightness by increasing the duty ratio of the first to fourth switching signals HO1, LO1, HO2, and LO2, and the first to fourth switching signals HO1, LO1, HO2, and LO2 ), the brightness can be reduced by reducing the duty ratio.

9A and 9B are exemplary timing diagrams of pulse output power of the LED driving circuit 100 according to another embodiment of FIG. 8 .

Referring to Figure 9a, it is shown that the output pulse power supply according to some embodiments of the present invention operates with one frequency. The PWM frequency operated at high frequency indicates operation with a 50% duty ratio, and the first and fourth transistors Q1 and Q4 are switched during the 50% period to indicate a positive voltage. After the operation of the first and fourth transistors Q1 and Q4, while the third and second transistors Q3 and Q2, which are in the negative voltage range, are driven, the PWM frequency operates at a high frequency and operates at a 50% duty ratio. indicates voltage. Thereafter, the first and fourth transistors Q1 and Q4 operate sequentially, indicating that the positive voltage and the negative voltage alternately operate.

Referring to Figure 9b, it is shown that the output pulse power supply according to some embodiments of the present invention operates with one frequency. The PWM frequency operated at high frequency indicates operation with a 30% duty ratio, and the first and fourth transistors Q1 and Q4 are switched during the 30% period to indicate a positive voltage. After the operation of the first and fourth transistors Q1 and Q4, while the third and second transistors Q3 and Q2, which are in the negative voltage range, are driven, the PWM frequency operates at a high frequency and operates at a 30% duty ratio. indicates voltage. Thereafter, the first and fourth transistors Q1 and Q4 operate sequentially, indicating that the positive voltage and the negative voltage alternately operate.

At this time, the first and fourth transistors Q1 and Q4 and the third and second transistors Q3 and Q2 for outputting the output pulse power include a dead time as shown to eliminate the simultaneous turn-on period. can do.

The example output power of FIGS. 9A and 9B supplies pulse power having different frequency duty ratios like the output pulse power, so that the LED light emitting unit 200 can be colored and dimmed. This is implemented with a positive pulse voltage and a negative pulse voltage, and the PWM frequency duty ratio of the positive voltage period and the negative voltage period may be the same or different, and it is an exemplary configuration for the output pulse power supply of the LED driving circuit. only, and this order is not limited thereto. In addition, it is possible to implement color modulation in the light emitting unit 200 by adjusting the duty ratio of high frequency, and it is only an exemplary configuration for the output pulse power supply of the LED driving circuit, and the present invention is not limited thereto.

Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art can realize that the present invention can be implemented in other specific forms without changing the technical spirit or essential features. you will be able to understand Therefore, the embodiments described above should be understood as illustrative in all respects and not limiting.

1: LED lighting device 100: LED driving circuit
110: DC-DC converter 120: wired/wireless communication module
130: light emitting control unit 140: power supply unit

Claims (11)

an LED driving circuit that generates an LED driving signal from an input power supply; and
A light emitting unit connected between a first node and a second node and receiving and driving the LED driving signal,
the light emitting part,
A plurality of first light emitting diodes having an anode connected in the direction of the first node, a cathode connected in the direction of the second node, and turned on to emit light of a first color;
A plurality of second light emitting diodes having a cathode connected in the direction of the first node and an anode connected in the direction of the second node, turned on to emit light of a second color different from the first color,
The plurality of first light emitting diodes and the plurality of second light emitting diodes,
Characterized in that it is driven to emit light alternately by the LED driving signal,
An LED lighting device with a color-modulating function. According to claim 1,
The input power supply has different positive and negative voltages;
The LED driving circuit
A positive voltage and a negative voltage in which a neutral voltage is present are alternately outputted through a plurality of transistors by receiving a control signal from the light emitting controller,
Providing a forward bias voltage from the first node to the second node at a first time point;
providing a forward bias voltage from the second node to the first node at a second time point;
Characterized in that it operates at one frequency,
An LED lighting device with a color-modulating function. According to claim 1,
The LED driving circuit receives a control signal from the light emitting control unit and outputs a neutral voltage through a plurality of transistors and alternately outputs continuous positive and negative voltages,
Providing a forward bias voltage from the first node to the second node at a first time point;
providing a forward bias voltage from the second node to the first node at a second time point;
Characterized in that the continuous positive voltage and the continuous negative voltage operate as a high-frequency PWM, and have a frequency of the low-frequency PWM at the time of alternating with each other,
An LED lighting device with a color-modulating function. According to claim 1,
The LED driving circuit receives a control signal from the light emitting control unit and alternately outputs a positive voltage and a negative voltage in which a neutral voltage exists through a plurality of transistors,
Providing a forward bias voltage from the first node to the second node at a first time point;
providing a forward bias voltage from the second node to the first node at a second time point;
Characterized in that it operates at one frequency
An LED lighting device with a color-modulating function. According to claim 2
The LED driving circuit,
A wired/wireless communication module generating a PWM control signal from a control input provided from the outside;
A light emitting controller generating first and second switching signals from the PWM control signal;
A first transistor that is turned on by the first switching signal and provides the power supply voltage to the plurality of first light emitting diodes to turn them on; and
A second transistor turned on by the second switching signal to provide the power supply voltage to the plurality of second light emitting diodes to turn them on,
An LED lighting device with a color-modulating function. According to claim 5,
The LED driving circuit controls the color temperature and brightness of the third color light emitted by the light emitting unit by adjusting the duty ratio of the first switching signal and the duty ratio of the second switching signal.
An LED lighting device with a color-modulating function. According to claim 5,
The light emitting control unit sets a dead time so that the first switching signal and the second switching signal do not become turn-on voltages at the same time,
An LED lighting device with a color-modulating function. According to claim 3 or 4,
The LED driving circuit,
A wired/wireless communication module generating a PWM control signal from a control input provided from the outside;
A light emitting controller for generating first to fourth switching signals from the PWM control signal;
A first transistor and a fourth transistor turned on by the first switching signal and the fourth switching signal at a first point in time to provide the power supply voltage to the plurality of first light emitting diodes to turn them on;
A second transistor and a third transistor turned on by the third switching signal and the second switching signal at a second time to provide the power supply voltage to the plurality of second light emitting diodes to turn them on,
An LED lighting device with a color-modulating function. According to claim 8,
The light emitting controller adjusts the duty ratio between the first switching signal and the fourth switching signal and the duty ratio between the third switching signal and the second switching signal, so that the light of the third color emitted from the plurality of light emitting diodes is controlled. Adjust color temperature and brightness,
An LED lighting device with a color-modulating function. According to claim 8,
The light emitting control unit sets a dead time so that the first switching signal, the fourth switching signal, the third switching signal, and the second switching signal do not become turn-on voltages at the same time,
An LED lighting device with a color-modulating function. an LED driving circuit that generates a pulsed output power from the power supply voltage; and
A light emitting unit connected between a first node and a second node and receiving and driving the pulse output power,
the light emitting part,
A plurality of first light emitting diodes having an anode connected in the direction of the first node, a cathode connected in the direction of the second node, and turned on to emit light of a first color;
A plurality of second light emitting diodes having a cathode connected in the direction of the first node and an anode connected in the direction of the second node, turned on to emit light of a second color different from the first color,
The first light emitting diode is turned on by a forward bias pulse output power supply at a first time point to emit light, and is turned off by a reverse bias pulse output power source at a second time point after the first time point point,
The second light emitting diode is turned off by the reverse bias pulse output power at the first time point and turned on by the forward bias pulse output power source at the second time point to emit light.
LED lighting device.

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