LED control device and lighting device comprising the same

Abstract

Disclosed are a light emitting diode (LED) control device and a lighting device. The LED control device includes a power supply connected to a first driving node and a second driving node of an LED driver configured to provide driving power to a light source including a plurality of LEDs, a controller configured to operate by a first internal power voltage output from the power supply and receive a control command from an external controller, and a switching device connected to the second driving node and configured to operate by a second internal power voltage output from the power supply and control brightness of the light source based on a control signal output from the controller in response to the control command.

Description

[0001] Cross-references to related applications

[0002] This application claims the benefit of priority to Korean Patent Application No. 10-2021-0010169, filed with the Korean Intellectual Property Office on January 25, 2021, the disclosure of which is incorporated herein by reference in its entirety. Technical Field

[0003] Embodiments of this disclosure relate to an LED control device and a lighting device including the LED control device. Background Technology

[0004] Light-emitting diodes (LEDs) offer low power consumption and long lifespan, and have rapidly replaced conventional fluorescent and incandescent lamps. Recently, various types of lighting devices using LEDs as the light source have been developed and marketed, and research is actively underway into lighting devices with functions beyond simple illumination. For example, functions such as controlling the color temperature and / or brightness of light, or monitoring the operating status of the LEDs installed as the light source, can be included in the lighting device. Summary of the Invention

[0005] Embodiments of this disclosure provide an LED control device and a lighting device including the LED control device, which can reduce the frequency of replacement and / or upgrade of components included in the lighting device and can realize various functions.

[0006] According to an embodiment, an LED control device is provided, which may include: a power supply connected to a first driving node and a second driving node of an LED driver, the LED driver being configured to provide driving power to a light source comprising a plurality of LEDs; a controller configured to operate by means of a first internal power voltage output from the power supply and to receive control commands from an external controller; and a switching device connected to the second driving node and configured to operate by means of a second internal power voltage output from the power supply and to control the brightness of the light source based on a control signal output from the controller in response to the control commands.

[0007] According to an embodiment, a lighting device is provided, which may include: an LED driver configured to generate driving power for driving LEDs using AC power, and output the driving power through a first driving node and a second driving node; a light source including at least one LED string, the at least one LED string including the LEDs, and the light source being connected between the first driving node and the at least one LED node; and an LED control device connected between the LED driver and the light source to the first driving node, the second driving node, and the LED node, wherein the LED control device includes a controller, a switching device, and a power supply, the controller being connected to communicate with an external controller, the switching device being connected between the LED node and the second driving node and configured to control the LED string in response to a control signal output from the controller, and the power supply being connected to the first driving node and the second driving node and configured to output an internal power voltage for operation of the controller and the switching device.

[0008] According to an embodiment, an LED control device is provided, which may include: a power supply connected to a first output terminal and a second output terminal among a plurality of output terminals included in the output harness of an LED driver, and configured to generate a first internal power voltage and a second internal power voltage using driving power output by the LED driver; a controller configured to operate via the first internal power voltage based on a control command received from an external controller and to generate a pulse width modulation (PWM) signal as a control signal; and a switching device connected to the second output terminal, configured to operate via the second internal power voltage and to adjust the brightness of at least one of a plurality of LEDs operated by the driving power based on the control signal. Attached Figure Description

[0009] Various aspects, features, and advantages of this disclosure will become clearer from the following detailed description taken in conjunction with the accompanying drawings, in which:

[0010] Figure 1 This is a block diagram illustrating a lighting device according to an embodiment;

[0011] Figure 2 This is a block diagram illustrating an LED control device and a light source according to an embodiment;

[0012] Figure 3 and Figure 4 References are shown according to embodiments. Figure 1 and Figure 2 Circuit diagram of the switch and light source;

[0013] Figure 5This is a block diagram illustrating an LED control device and a light source according to an embodiment;

[0014] Figure 6 This is a block diagram illustrating an LED driver according to an embodiment;

[0015] Figure 7 This is a circuit diagram illustrating a converter circuit included in an LED driver according to an embodiment;

[0016] Figure 8 A graph relating to the dimming function of the LED control device according to an embodiment is shown;

[0017] Figure 9 This is a block diagram illustrating an LED control device and a light source according to an embodiment;

[0018] Figures 10 to 12 The illustration shows the reference according to the embodiment. Figure 9 The operation-related curves of the LED control device;

[0019] Figure 13 This is a block diagram illustrating an LED control device and a light source according to an embodiment;

[0020] Figures 14 to 16 References are shown according to embodiments. Figure 13 The circuit diagram of the switches included in the light source and LED control device, and Figure 17 The illustration shows the relationship with the embodiment. Figures 14 to 16 The graphs showing the operation-related curves of the LED control device are shown.

[0021] Figure 18 This is a block diagram illustrating a lighting device according to an embodiment; and

[0022] Figure 19 and Figure 20 A lighting device according to an embodiment is shown. Detailed Implementation

[0023] In the following description, embodiments of the present disclosure will be described with reference to the accompanying drawings. The embodiments described herein are exemplary embodiments, and therefore the inventive concept is not limited thereto, and may be implemented in various other forms. Each embodiment provided in the following description is not excluded from being associated with one or more features of another example or another embodiment also provided herein or not provided herein but consistent with the inventive concept. For example, unless otherwise mentioned in the description of a particular example, even if something described in a particular example is not described in a different example, it may be understood to be related to or combined with that different example.

[0024] Figure 1This is a block diagram illustrating a lighting device according to an embodiment.

[0025] Reference Figure 1 The lighting device 10 in this embodiment may include an LED driver 20 connected to a power supply 1, a light source 30, and an LED control device 40. The LED driver 20 may receive alternating current (AC) power V output from the power supply 1. AC It can also output driving power V for driving the LEDs included in the light source 30. DRV For example, LED driver 20 can output a drive current I for driving the LED. LED As a constant current, the LED driver 20 can output driving power V through the first driving node 21 and the second driving node 22. DRV .

[0026] LED driver 20 may include AC power V output from power supply 1. AC A rectifier circuit for rectifying direct current (DC) power, and a circuit for generating drive power V using the rectified DC power. DRV The converter circuit. In this embodiment, an electromagnetic interference (EMI) filter may be further connected between the power supply 1 and the rectifier circuit. The structure and operation of the LED driver 20 will be described later.

[0027] The light source 30 may include a plurality of LEDs, and the plurality of LEDs may provide at least one LED string. In an embodiment, the plurality of LEDs may include a first LED configured to emit light having a first color temperature and a second LED configured to emit light having a second color temperature different from the first color temperature. For example, the first LED may output cool white light, and the second LED may output warm white light. The first LED may provide at least one first LED string, and the second LED may provide at least one second LED string. The first LED string and the second LED string may be connected in parallel with each other. The number of LED strings included in the light source 30 is not limited to two.

[0028] LED control device 40 may include a power supply, a controller, and a switching device. The controller may be connected to an external controller and can generate predetermined control signals, and the switching device may operate in response to the control signals. For example, the switching device may be directly connected to the light source 30 and can control multiple LEDs included in the light source 30 in response to the control signals. The power supply may use drive power V. DRV This generates the internal power voltage required for operating the controller and switching devices.

[0029] Figure 2 This is a block diagram illustrating an LED control device and a light source according to an embodiment.

[0030] Reference Figure 2The LED control device 100 in this embodiment may include a power supply 110, a controller 120, and a switching device 130. The LED control device 100 can be connected to... Figure 1 The LED control device 40 shown is the same. The power supply 110 can use the drive power V output from the LED driver. DRV The internal power voltage V required to generate the operation of the controller 120 and the switching device 130 INT1 and V INT2 In this embodiment, the operating voltage of the controller 120 may differ from the operating voltage of the switching device 130, and the power supply 110 can supply the first internal power voltage V. INT1 Supply to controller 120, and can supply the second internal power voltage V INT2 Supply to switching device 130. Power supply 110 may include methods for generating a first internal electrical voltage V. INT1 The first regulator, and the one used to generate the second internal power voltage V INT2 The second regulator.

[0031] The controller 120 can receive a first internal power voltage V INT1 The controller 120 operates and can generate a control signal CTR for controlling the switching device 130. For example, the control signal CTR can be a pulse width modulation (PWM) signal. The controller 120 can be connected to communicate with an external controller and can adjust the duty cycle and / or frequency of the control signal CTR in response to control commands transmitted from the external controller. For example, the controller 120 can adjust the duty cycle of the control signal CTR in response to a dimming command included in the control command. When the dimming command is a brightness increase command, the controller 120 can increase the duty cycle of the control signal CTR, and when the dimming command is a brightness decrease command, the controller 120 can decrease the duty cycle of the control signal CTR.

[0032] In this embodiment, controller 120 can be connected to an external controller via wired or wireless communication and can receive control commands. For example, controller 120 can be connected to an external controller wirelessly via technologies such as Bluetooth, Zigbee, Wi-Fi, Li-Fi, and infrared communication. Alternatively, controller 120 can be connected to an external controller via wired communication such as a Digital Addressable Lighting Interface (DALI) or Digital Multiplexing (DMX). Controller 120 may include a microcontroller unit (MCU), communication circuitry, an antenna, and an oscillator to operate via various wired and wireless connections to an external controller.

[0033] The microcontroller unit of controller 120 can generate a control signal CTR using control commands received from an external controller via a communication circuit. As described above, the duty cycle and / or frequency of the control signal CTR can be changed according to the control command.

[0034] Switching device 130 may be connected to light source 105. According to an embodiment, light source 105 may include two or more LED strings connected in parallel with each other, and at least one of the two or more LED strings may be connected to switching device 130. In an embodiment, switching device 130 may include a switch connected to light source 105 and a switch driver for controlling the switch to be turned on / off. In an embodiment, the number of switches and the number of switch drivers included in switching device 130 may vary. Reference will be made later. Figure 3 and Figure 4 The detailed structure of the switching device 130 is described.

[0035] exist Figure 2 In the illustrated embodiment, the LED control device 100 and the light source 105 can be implemented on different packaging substrates. Therefore, the LED control device 100 can be selectively added to an existing lighting device implemented by the LED driver and the light source 105, and the additional functions provided by the LED control device 100 can be implemented in the lighting device using components of the existing lighting device.

[0036] Figure 3 and Figure 4 References are shown according to embodiments. Figure 1 and Figure 2 The circuit diagram of the switch and the light source.

[0037] exist Figure 3 and Figure 4 In the illustrated embodiment, the light source 105 may include a first LED string 106 and a second LED string 107 connected in parallel between the first driving node 101 and the LED node 103. The first LED string 106 may include a first LED LED1, and the second LED string 107 may include a second LED LED2. The first LED string 106 and the second LED string 107 may be connected between the first driving node 101 and the second driving node 102, and may receive driving power V. DRV And it can be driven by the drive current I input via the first drive node 101. LED It shines.

[0038] Reference Figure 3 The switching device 130 may include a switch SW connected to the second LED string 107 and a switch driver SDV. The switch driver SDV can be operated by a control signal CTR, and the control signal CTR may be a PWM signal generated by a controller, as referenced above. Figure 2 As described.

[0039] exist Figure 3 In the illustrated embodiment, the on-time and off-time of switch SW can be determined by the duty cycle of control signal CTR. As the duty cycle of control signal CTR increases, the on-time of switch SW can increase compared to the off-time, and the brightness of light source 105 can increase. When the duty cycle of control signal CTR decreases, the brightness of light source 105 can decrease.

[0040] In this embodiment, a dimming function can be implemented to control the brightness of the light source 105 by adjusting the duty cycle of the control signal CTR input to the switching device 130. In other words, according to this embodiment, a dimming-enabled lighting device can be provided by additionally connecting the LED control device to a lighting device that may not provide dimming functionality. Furthermore, since the switching device 130 includes only a single switch SW and a single switch driver SDV, the production cost and power consumption of the LED control device can be reduced.

[0041] Reference Figure 4 The switching device 130A may include a first switch SW1 and a second switch SW2, as well as a first switch driver SDV1 and a second switch driver SDV2. The first switch SW1 may be connected between the first LED string 106 and the second drive node 102, and the second switch SW2 may be connected between the second LED string 107 and the second drive node 102.

[0042] exist Figure 4 In the illustrated embodiment, the first switch SW1 can be controlled by a first switch driver SDV1, and the second switch SW2 can be controlled by a second switch driver SDV2. The first switch driver SDV1 can receive a first control signal CTR1 and control the first switch SW1, and the second switch driver SDV2 can receive a second control signal CTR2 and control the second switch SW2. Therefore, the brightness of each of the first LED string 106 and the second LED string 107 can be controlled independently.

[0043] As an example, the first LED (LED1) and the second LED (LED2) can output light with different color temperatures or different colors. For example, in... Figure 4 In the illustrated embodiment, by independently controlling the brightness of each of the first LED string 106 and the second LED string 107 using the first switch SW1 and the second switch SW2 via the first LED node 103 and the second LED node 104 respectively, the user can adjust the color, brightness, and color temperature of the light output from the light source 105.

[0044] In this embodiment, the first LED string 106 can output cool white light, and the second LED string 107 can output warm white light. As an example, assuming that the first color temperature of the light output from the first LED string 106 is 6000K (which can be cool white), and the second color temperature of the light output from the second LED string 107 is 2700K (which can be warm white), the color temperature CCT of the light output from the light source 105 can be determined as shown in Table 1, based on the duty cycle of the first control signal CTR1 that determines whether the first switch SW1 is on or off, and the duty cycle of the second control signal CTR2 that determines whether the second switch SW2 is on or off.

[0045] [Table 1]

[0046] 100％ 0％ 6000K 75％ 25％ 5175K 50％ 50％ 4350K 25％ 75％ 3525K 0％ 100％ 2700K

[0047] It can be used as a reference Figure 4 The described embodiments use switching devices with different configurations to implement the operations in Table 1 as examples. As an example, the operations described with reference to Table 1 can be implemented by implementing the first switch SW1 as an NMOS transistor and the second switch SW2 as a PMOS transistor, and by connecting the output terminal of a single switch driver to the gates of the first switch SW1 and the second switch SW2. In this case, the operations described with reference to Table 1 can be implemented with a single control signal.

[0048] Figure 5 This is a block diagram illustrating an LED control device and a light source according to an embodiment.

[0049] Reference Figure 5 The LED control device 200 in this embodiment may include a power supply 210, a controller 220, and a switching device 230, and can be connected to an external LED driver via a first driving node 201 and a second driving node 202. The LED control device 200 can be coupled with... Figure 1 The LED control device 40 shown is or Figure 2 The LED control device 100 shown is the same. Figure 5 In the illustrated embodiment, the light source 205 and the switching device 230 can be constructed similarly to those shown in the reference diagram. Figure 3 or Figure 4 Example of the description.

[0050] For example, the light source 205 may include at least one LED string. The switching device 230 may include a switch SW connected to the LED string and a switch driver SDV. The switch driver SDV may control the switch SW to turn on / off in response to a control signal CTR received from the controller 220, and may control the brightness of the light source 205 according to the duty cycle of the control signal CTR.

[0051] Power supply 210 may include a first regulator 211 and a second regulator 212. Each of the first regulator 211 and the second regulator 212 may include an input terminal IN and an output terminal OUT, as well as a resistor terminal ADJ connected to a resistor. For example, a first internal power voltage V output to the output terminal OUT. INT1 Second internal power voltage V INT2 The size of each of them can vary depending on the resistance value connected to the resistor terminal ADJ.

[0052] The input terminal IN of each of the first regulator 211 and the second regulator 212 can be connected to the node between the first diode D1 and the first capacitor C1, and the first diode D1 can be connected to the first drive node 201. Therefore, the drive power V... DRV Input can be made via the IN terminal. The OUT terminal of each of the first regulator 211 and the second regulator 212 can be connected to the second capacitor C2 or the third capacitor C3, which serves as the output capacitor.

[0053] In the first regulator 211, a first resistor R1 and a second resistor R2 can be connected to the output terminal OUT. The node between the first resistor R1 and the second resistor R2 can be connected to the resistor terminal ADJ of the first regulator 211, and the first internal power voltage V can be determined based on the resistance value of each of the first resistor R1 and the second resistor R2. INT1 The magnitude of the voltage. Similarly, the second internal power voltage V can be determined based on the resistance values ​​of each of the third resistor R3 and the fourth resistor R4. INT2 Size.

[0054] In the embodiment, the first internal power voltage V INT1 It can be the power voltage required for the operation of controller 220, and the second internal power voltage V INT2 This could be the electrical voltage required for the operation of the switching device 230. For example, the first internal electrical voltage V. INT1 The size can be smaller than the second internal power voltage V INT2 The size. However, its embodiments are not limited to this, and the first internal power voltage V INT1 Second internal power voltage V INT2 The size of each of them may vary depending on the embodiment.

[0055] Controller 220 can generate a control signal CTR as a PWM signal and can output the control signal CTR to the switch driver SDV. Controller 220 can be connected to external controller 240 via various wired / wireless communication methods. For example, external controller 240 can be a mobile device such as a smartphone or tablet PC, or a lighting controller installed and fixed in a space adjacent to LED control device 200.

[0056] As an example, controller 220 can recognize a user's voice commands via external controller 240 and generate a control signal CTR based on the command. In this case, external controller 240 can be implemented as an AI speaker instead of a mobile device or lighting controller. When the user sends a command via voice using the voice recognition function of the AI ​​speaker, controller 220 can generate a control signal CTR in response to the command, and can turn the light source 205 on / off or adjust the brightness of the light source 205.

[0057] The user can monitor the status of the light source 205 included in the LED device 200 via an external controller 240, and can also monitor the driving power V. DRV The status of the LED driver supplied to the LED control device 200. For example, when at least one of the LEDs included in the light source 205 fails, the voltage applied to the entire light source 205 may become different. The LED control device 200 can monitor the voltage and / or current output from the LED driver, thereby monitoring whether the LED is damaged and monitoring power consumption.

[0058] Supply drive power V to light source 205 DRV The power consumption of an LED driver can be determined by the maximum value of the rated voltage and the rated current of the LED driver, and can be defined by the LED driver's specifications. When the forward voltage of the LED included in the light source 205 is similar to the minimum voltage of the rated voltage range of the LED driver, there may be a difference between the power consumption described in the LED driver's specifications and the actual power consumed by the light source 205. In an embodiment, by further including a voltage / current detection circuit connected to the light source 205, the controller 220 can calculate the actual power consumption of the light source 205, and can send the actual power consumption to an external controller 240, and can notify the user of the power consumption.

[0059] Furthermore, the LED control device 200 in the embodiment can determine whether flickering occurs in the light source 205. As described above, the LED control device 200 may include a voltage / current detection circuit that can detect the voltage and current of the light source 205 and transmit this voltage and current to the controller 220. In this case, the controller 220 can use the detected drive current I input to the light source 205.LED The ripple component of the sensed voltage is used to determine whether flickering has occurred, and the determined result can be sent to an external controller 240. Alternatively, an optical sensor for detecting the light output from the light source 205 can be added to the LED control device 200, and the controller 220 can calculate a precise flicker index. The flicker index can be determined as a value between 0 and 1, and the more flickering occurs, the higher the value can be. When flickering is determined to occur, the controller 220 can adjust the frequency of the control signal CTR and can minimize the flickering of the light source 205.

[0060] Figure 6 This is a block diagram illustrating an LED driver according to an embodiment.

[0061] Reference Figure 6 The LED driver 300 in this embodiment may include an electromagnetic interference (EMI) filter 310, a rectifier circuit 320, and a converter circuit 330. The LED driver 300 can be compared with the LED driver described in the preceding embodiments (including...). Figure 1 The LED driver 20 is the same. The EMI filter 310 can accept AC power V. AC And it can be included in AC power V AC The electromagnetic waves in the circuit are filtered. The rectifier circuit 320 can filter the AC power V filtered by the EMI filter 310. AC It is converted to DC power. In an embodiment, rectifier circuit 320 may include a diode bridge.

[0062] Converter circuit 330 can supply drive power V to multiple LEDs DRV The converter circuit 330 can be configured in various ways according to embodiments. For example, the converter circuit 330 may include a power factor correction (PFC) converter and a DC-DC converter, the PFC converter improving the power factor and increasing the voltage. AC The rectified power V generated by rectification REC To generate the driving power V for driving multiple LEDs DRV The drive power V can be determined by the characteristics of multiple LEDs connected to the output terminals of the converter circuit 330 (e.g., the forward voltage of each LED). DRV The magnitude of the voltage. In this embodiment, the LED driver 300 can output an LED current I, which is a constant current for driving the LED. LED .

[0063] Figure 7 This is a circuit diagram illustrating a converter circuit included in an LED driver according to an embodiment.

[0064] Figure 7 It shows that it includes Figure 6 The converter circuit 330 in the LED driver 300 of the illustrated embodiment. (Refer to...) Figure 7 as well as Figure 6 The converter circuit 330 may include a power factor correction (PFC) converter 331, a DC-DC converter 332, and a controller 333. The PFC converter 331 can operate as a boost converter circuit, which can convert voltage from... Figure 6 The rectified power V output by the rectifier circuit 320 shown is... REC The voltage is boosted and may include a first inductor L1, a first diode D1, a first capacitor C1, and a first converter switch Q1.

[0065] When the first converter switch Q1 is turned on by the first signal CON1 output from controller 333, the rectified power V REC The resulting current can flow to the switched resistor R. S Furthermore, energy can be charged into the first inductor L1. When the controller 333 outputs the first signal CON1 to open the first converter switch Q1, the energy charged into the first inductor L1 can be released, and a rectified power V greater than that input to the PFC converter 331 can be generated. REC The voltage. In this case, the high-frequency component can be removed by the first capacitor C1 connected to the first diode D1.

[0066] The DC-DC converter 332, connected in series with the PFC converter 331, can operate as a buck converter circuit and may include a second inductor L2, a second diode D2, a second capacitor C2, and a second converter switch Q2. Similar to the first converter switch Q1, the second converter switch Q2 may be controlled by the controller 333.

[0067] When controller 333 outputs the second signal CON2 to turn on the second converter switch Q2, current can flow to the second inductor L2, and energy can be charged into the second inductor L2. When controller 333 outputs the second signal CON2 to turn off the second converter switch Q2, the current caused by the energy charged into the second inductor L2 can flow, and drive power V can be output. DRV The second diode D2 provides a path for current to flow when the second converter switch Q2 is open, and the second capacitor C2 can be used as a rectifier capacitor.

[0068] The LED current I output from the LED driver 300 to the multiple LEDs included in the light source. LEDIt can have a fixed value. Furthermore, the LED driver 300 can have a rated voltage within a predetermined rated range, and the power consumption of the LED driver 300 can be determined by the maximum value of the rated voltage and the LED current I. LED Confirmed. LED current I of LED driver 300. LED Rated voltage and power consumption can be provided as specifications for LED driver 300.

[0069] However, when the sum of the forward voltages of the multiple LEDs connected to the LED driver 300 drops below an intermediate voltage within the rated voltage range due to a fault such as damage to at least some of the LEDs, the power consumption of the multiple LEDs connected to the LED driver 300 as a load may decrease. Therefore, there may be a difference between the power consumption described in the specifications of the LED driver 300 and the power actually consumed by the LED driver 300 during operation.

[0070] In this embodiment, an LED control device connected between a light source comprising multiple LEDs and an LED driver 300 can be used to address the aforementioned problems. The LED control device can monitor the actual power consumption of the LED driver 300 by detecting the voltage applied to the multiple LEDs and the current flowing through them. For example, when multiple LEDs provide multiple LED strings, and a relatively small voltage is detected being applied to one of the LED strings, it can be determined that a portion of the LEDs included in the corresponding LED string may have failed. Therefore, the power consumption of the LED driver 300 and the status of the LED strings connected to the LED driver 300 can be monitored.

[0071] Figure 8 A graph relating to the dimming function of an LED control device according to an embodiment is shown.

[0072] Figure 8 The waveform of the control signal output from the controller of the LED control device to the switching device is shown. Reference will be made to the following description. Figure 1 , Figure 2 , Figure 5 and Figure 6 To describe the operation of the LED control device 200.

[0073] Reference Figure 8 In the first curve, the control signal CTR can have a 10% duty cycle. Therefore, the on-time T of the control signal CTR... ON1 It can be 10% of the period TD of the control signal CTR. Figure 8 In the second curve, the control signal CTR can have a 30% duty cycle, and in the third curve, the duty cycle of the control signal CTR can be 60%. Figure 8In the fourth curve diagram, the control signal CTR can have a 90% duty cycle.

[0074] The drive current I output from LED driver 300 LED It is possible to only apply the control signal CTR during its on-time T. ON1 T ON2 T ON3 and T ON4 The light source 205 is supplied with a current that is 30%. As the duty cycle of the control signal CTR increases, the brightness of the light source 205 can increase, and as the duty cycle decreases, the brightness of the light source 205 can decrease. For example, when the duty cycle of the control signal CTR is 30%, only 30% of the rated current can be supplied to the light source 205.

[0075] For reference Figure 8 As stated above, when the brightness of the light source 205 is adjusted using the duty cycle of the control signal CTR, flickering may occur in the light source 205. In an embodiment, when flickering occurs in the light source 205, the flickering of the light source 205 can be reduced by increasing or decreasing the frequency of the control signal CTR.

[0076] Figure 9 This is a block diagram illustrating an LED control device and a light source according to an embodiment.

[0077] Reference Figure 9 The LED control device 400 in this embodiment can be connected to a first driving node 401 and a second driving node 402, and can also be connected to a light source 405. The LED control device 400 may include a power supply 410, a controller 420, a switching device 430, and a current sensing circuit 440. The operation of the power supply 410, the controller 420, and the switching device 430 may be similar to the corresponding elements of the LED control device described in the previous embodiments.

[0078] exist Figure 9 In the illustrated embodiment, the LED control device 400 may use a current sensing circuit 440 to determine whether flickering occurs in the light source 405. When flickering is determined to occur in the light source 405, the controller 420 may increase or decrease the frequency of the control signal CTR. Therefore, the operating frequency of the switch included in the switching device 430 and connected to the second drive node 402 may be increased or decreased.

[0079] As an example, the current sensing circuit 440 can be connected to the first driving node 401 and can detect the driving current I input to the light source 405 through the first driving node 401. LEDA sensing voltage is generated. Controller 420 can determine whether flickering has occurred in light source 405 by comparing the fluctuation of the sensing voltage with a reference value. In an embodiment, controller 420 can compare the difference between the maximum and minimum values ​​of the sensing voltage over a predetermined time period with a reference value, and when the difference between the maximum and minimum values ​​is greater than the reference value, controller 420 can determine that flickering has occurred in light source 405.

[0080] When flickering is detected in the light source 405, the controller 420 can increase or decrease the frequency of the control signal CTR. Subsequently, when the switching device 430 operates with the control signal CTR at the changed frequency, the controller 420 can again compare the fluctuation of the sensed voltage with a reference value. When the fluctuation of the sensed voltage is less than the reference value, the controller 420 can continuously output the control signal CTR at the changed frequency to the switching device 430, and when the fluctuation of the sensed voltage is greater than the reference value, the controller 420 can change the frequency of the control signal CTR.

[0081] In the following description, reference will be made to Figures 10 to 12 The operation of the LED control device 400 is described in more detail.

[0082] Figures 10 to 12 The illustration shows the reference according to the embodiment. Figure 9 The graph shows the operation-related curves of the LED control device.

[0083] Figure 10 The method shown is that the controller 420 uses a sensed voltage generated by the current sensing circuit 440 to determine whether flickering has occurred. Figure 10 The first graph in the figure shows the sensed voltage generated by the current sensing circuit 440 when no flickering occurs in the light source 405. Figure 10 In the first curve, the sensed voltage can increase or decrease within a first fluctuation amount ΔV1 within a predetermined time period.

[0084] The first fluctuation amount ΔV1 can be less than the reference value used by the controller 420 to determine whether flickering has occurred. In this case, although no flickering occurs in the light source 405 or flickering actually occurs in the light source 405, the flickering may not be perceived by the human eye. Therefore, based on Figure 10 In the embodiment of the first graph, the controller 420 can determine that no flickering has occurred in the light source 405.

[0085] As an example, the reference value can be determined to be proportional to the magnitude of the sensed voltage. For instance, controller 420 can determine the reference value by multiplying the intermediate value of the sensed voltage by a predetermined coefficient. Therefore, considering the drive current I... LEDThe size of the light source 405 and the load of the light source 405 can be used to determine the reference value as the optimal voltage for determining whether flickering occurs.

[0086] Figure 10 The second graph shows the sensed voltage generated by the current sensing circuit 440 when flickering occurs in the light source 405. Figure 10 In the second curve, the sensed voltage can increase and decrease within a predetermined time period within a second fluctuation amount ΔV2, which is greater than the first fluctuation amount ΔV1. The second fluctuation amount ΔV2 can be greater than the reference value used by the controller 420 to determine whether flickering has occurred. Therefore, based on... Figure 10 In the embodiment of the second graph, the controller 420 can determine that flickering occurs in the light source 405.

[0087] When flickering is detected in light source 405, controller 420 can adjust the frequency of control signal CTR to reduce the amount of fluctuation in the sensed voltage. For example, refer to Figure 11 The controller 420 can reduce the frequency of the control signal CTR.

[0088] exist Figure 11 In the illustrated embodiment, the duty cycle of the control signal CTR output from the controller 420 can be 30%. The controller 420 can increase the period of the control signal CTR from an initial period TD0 to a first period TD1. When the control signal CTR has the first period TD1, the controller 420 can compare the fluctuation of the sensed voltage with a reference value. When the fluctuation of the sensed voltage is less than or equal to the reference value, the controller 420 can maintain the period of the control signal CTR at the first period TD1. When the fluctuation of the sensed voltage exceeds the reference value, the controller 420 can further increase the period of the control signal CTR to a second period TD2. When the fluctuation of the sensed voltage exceeds the reference value while the control signal CTR has the second period TD2, the controller 420 can increase the period of the control signal CTR to a third period TD3. As described above, the controller 420 can compare the fluctuation of the sensed voltage output from the current sensing circuit 440 with a reference value while reducing the frequency of the control signal CTR, and can output the control signal CTR at a frequency that does not flicker or minimizes flicker.

[0089] Reference Figure 12 The controller 420 can increase the frequency of the control signal CTR to suppress flickering. (See above reference.) Figure 11 As mentioned above, in Figure 12 In the embodiment shown, the duty cycle of the control signal CTR output from the controller 420 can be 30%.

[0090] The controller 420 can reduce the period of the control signal CTR from the initial period TD0 to the fourth period TD4. When the control signal CTR has the fourth period TD4, the controller 420 can compare the fluctuation of the sensed voltage with a reference value, and when the fluctuation of the sensed voltage is less than the reference value, the controller 420 can maintain the period of the control signal CTR at the fourth period TD4. When the fluctuation of the sensed voltage exceeds the reference value, the controller 420 can further reduce the period of the control signal CTR to the fifth period TD5. When the fluctuation of the sensed voltage exceeds the reference value while the control signal CTR has the fifth period TD5, the controller 420 can reduce the period of the control signal CTR to the sixth period TD6. As described above, the controller 420 can compare the fluctuation of the sensed voltage output from the current sensing circuit 440 with a reference value while increasing the frequency of the control signal CTR, and can output the control signal CTR at a frequency that does not flicker or minimizes flicker.

[0091] References can be executed sequentially. Figure 11 and Figure 12 Operation in the described embodiments. For example, controller 420 can find the optimal frequency for the control signal CTR while increasing or decreasing the frequency. When flicker is not suppressed during the operation of increasing the frequency of the control signal CTR, controller 420 can determine whether flicker has occurred while decreasing the frequency of the control signal CTR. In an embodiment, when flicker is not completely suppressed by adjusting the frequency of the control signal CTR, controller 420 can generate the control signal CTR at a frequency corresponding to the frequency with the minimum fluctuation of the sensed voltage.

[0092] Figure 13 This is a block diagram illustrating an LED control device and a light source according to an embodiment.

[0093] Reference Figure 13 In this embodiment, the LED control device 500 can be connected to the first driving node 501 and the second driving node 502, and can also be connected to the light source 505. The LED control device 500 may include a power supply 510, a controller 520, and a switching device 530, and the switching device 530 may include a bleeder circuit 535.

[0094] Power supply 510 can use drive power V DRV The first internal power voltage V INT1 Supply to controller 520, and can supply the second internal power voltage V INT2The power supply is provided to the switching device 530. The controller 520 can generate a control signal CTR and transmit the control signal CTR to the switching device 530, and the switching device 530 can control the light source 505 based on the control signal CTR.

[0095] As described above, the control signal CTR can be a PWM signal with a predetermined period and duty cycle, and the control signal CTR can have a first level during the on-time and a second level less than the first level during the off-time. For example, the first level can be a level at which the switch included in the switching device 530 can be turned on, and the second level can be a level at which the switch is turned off. As described above, in an embodiment, the second level can be ground voltage.

[0096] The on and off times of the control signal CTR are extremely short, and during the off time, the signal from LED driver 300 ( Figure 6 The output drive current I LED It may not be supplied to the light source 505. However, due to the extremely short off-time, the LED driver 300 may not be completely turned off during the off-time, and therefore, the drive current I at the on-time after the off-time is greater than the rated current. LED It may be supplied to light source 505.

[0097] In an embodiment, to address the aforementioned problems, the switching device 530 may include a discharge circuit 535. The discharge circuit 535 can be used to maintain a predetermined load impedance even during the off-time. In other words, through the discharge circuit 535, current can flow to the light source 505 even during the off-time of the control signal CTR. The current flowing to the light source 505 during the off-time can be less than the drive current I supplied to the light source 505 during the on-time. LED In the following description, reference will be made to... Figures 14 to 17 The operation of the switching device 530, including the discharge circuit 535, is described in more detail.

[0098] Figures 14 to 16 References are shown according to embodiments. Figure 13 The circuit diagram of the switches included in the light source and LED control device. Figure 17 The illustration shows the relationship with the embodiment. Figures 14 to 16 The graph shown is related to the operation of the LED control device.

[0099] Reference Figures 14 to 16 Describe the operation of the switching device 530. (Refer to...) Figure 14The light source 505 may include a first LED string 506 having a first LED LED1 and a second LED string 507 having a second LED LED2, and can be driven by a drive current I input to the drive node 501. LED To perform the operation.

[0100] The switching device 530 can be connected between the light source 505 and the second drive node 502, and may include a first switch SW1, a second switch SW2, a first switch driver SDV1, and a second switch driver SDV2. The first switch SW1 and the second switch SW2 can be connected in parallel with each other, and can be connected together to the first LED string 506 and the second LED string 507. The first switch SW1 can be turned on / off by a first control signal CTR1, and the second switch SW2 can be turned on / off by a second control signal CTR2.

[0101] exist Figure 14 In the illustrated embodiment, the first switch SW1 and the second switch SW2 can be alternately turned on. For example, the first switch SW1 can be turned on during the time when the light source 505 is emitting light, and the second switch SW2 can be turned on during the time when the light source 505 is not emitting light. Therefore, the second switch SW2 and the second switch driver SDV2 can form the above-mentioned reference. Figure 13 The described bleeder circuit is 535.

[0102] In this embodiment, the second control signal CTR2 can be a complementary signal to the first control signal CTR1, and the first switch SW1 and the second switch SW2 can have different characteristics. For example, when the first switch SW1 is turned on, the first on-state current flowing through the first switch SW1 can be greater than the second on-state current flowing through the second switch SW2 when the second switch SW2 is turned on. Therefore, when the second switch SW2 is turned on, the light source 505 may not actually emit light.

[0103] Alternatively, the first switch SW1 and the second switch SW2 may have the same characteristics, and the first control signal CTR1 and the second control signal CTR2 may have different levels. For example, the level of the first control signal CTR1 during the on-time of the first switch SW1 may be greater than the level of the second control signal CTR2 during the on-time of the second switch SW2. Therefore, the second on-current may be less than the first on-current.

[0104] exist Figure 15 In the illustrated embodiment, impedance device 536 may be connected between the second switch SW2 and the light source 505. Impedance device 536 may include a high-power bleed resistor and / or a bleed inductor. Therefore, when the second switch SW2 is turned on, the voltage applied to the light source 505 can be reduced. Figure 15In the illustrated embodiment, the discharge circuit 535 may include a second switch SW2, a second switch driver SDV2, and an impedance device 536. Since the impedance device 536 is connected between the second switch SW2 and the light source 505, the second switch SW2 may have the same characteristics as the first switch SW1, and the second control signal CTR2 may be a complementary signal to the first control signal CTR1.

[0105] exist Figure 16 In the illustrated embodiment, the first switch SW1 and the second switch SW2 can be controlled by a single control signal CTR. To control the first switch SW1 and the second switch SW2 using a single control signal CTR, the second switch driver SDV2 can use a complementary signal of the control signal CTR to control the second switch SW2. (See reference...) Figure 15 As mentioned above, in Figure 16 In the illustrated embodiment, the discharge circuit 535 may include a second switch SW2, a second switch driver SDV2, and an impedance device 536.

[0106] Figure 17 The waveform of the control signal CTR is shown. (Refer to...) Figure 17 The control signal CTR can have a first level V during the on-time of the light source 505. ON And it can have a second level V during the off-time of the light source 505. OFF Second level V OFF It can be greater than the ground voltage.

[0107] exist Figure 17 In the illustrated embodiment, the second switch SW2 included in the discharge circuit 535 can be implemented to be controlled by the first level V. ON The gate voltage is turned off and can be switched on via the second level V. OFF The device that turns on the gate voltage. The current path can be provided by the second switch SW2, which is turned on during the off-time of the light source 505, and the impedance device 536 connected to the second switch SW2, and a predetermined load impedance can be provided to the LED driver. Therefore, during the on-time after the off-time of the light source 505, the drive current I can be prevented. LED Increasing the current beyond the rated current can improve the stability of the lighting fixture.

[0108] Figure 18 This is a block diagram illustrating a lighting device according to an embodiment.

[0109] Figure 18 A lighting device 600 providing dimming functionality is shown. (See reference...) Figure 18 The lighting device 600 may include a light source 610, an LED driver 620, and an LED control device 630. The LED driver 620 can receive AC power V.AC And can generate driving power V DRV The light source 610 may include at least one LED string, and the LED string can be driven by power V. DRV This is used for operation. A driving current I can be supplied to the light source 610 through the first driving node 601. LED Furthermore, the LED control device 630 can be connected to the first drive node 601 and the second drive node 602.

[0110] exist Figure 18 In the illustrated embodiment, the LED control device 630 may include a power supply 631, a controller 632, a switching device 633, and a dimming switch 634. The power supply 631 may output a first internal power voltage V. INT1 Second internal power voltage V INT2 and the third internal power voltage V INT3 And the controller 632 can operate at the first internal power voltage V INT1 The operation is performed under the second internal power voltage V, and the switching device 633 can operate under the second internal power voltage V. INT2 The controller 632 can output a control signal CTR for controlling the switching device 633 and a dimming control signal CTR for controlling the dimming switching device 634. DIM And the control signal CTR and the dimming control signal CTR DIM Each of these can be a PWM signal. The specific operation of the power supply 631, controller 632, and switching device 633 can be understood by referring to the other embodiments described above.

[0111] The dimming switch device 634 can operate at a third internal power voltage V INT3 It can operate in response to the dimming control signal CTR. DIM Generate dimming control voltage. Figure 18 In the illustrated embodiment, the LED driver 620 can provide dimming functionality and therefore may include dimming control terminals DIM+ and DIM-, such as Figure 18 As shown. The dimming switch device 634 can respond to the dimming control signal CTR. DIM The generated dimming control voltage is output to the dimming control terminals DIM+ and DIM-.

[0112] As an example, the dimming control signal CTR DIM It can be a PWM signal, and the dimming switch device 634 can be based on the dimming control signal CTR. DIM The duty cycle is used to determine the magnitude of the dimming control voltage. For example, assuming the dimming control voltage for maximum output brightness is 3V and the dimming control signal CTR... DIMWhen the duty cycle is 50%, the dimming control voltage can be 1.5V. Furthermore, when the dimming control signal CTR... DIM When the duty cycle is 30%, the dimming control voltage can be 0.9V, and when the dimming control signal CTR... DIM When the duty cycle is 80%, the dimming control voltage can be 2.4V. The LED current I output from the LED driver 620... LED The size can be changed according to the magnitude of the dimming control voltage, and therefore, the brightness of the light output from the light source 610 can be adjusted. Figure 18 In the illustrated embodiment, since the dimming function is implemented by the dimming switch device 634, the duty cycle of the control signal CTR output from the controller 632 to the switch device 633 can be a constant value.

[0113] Figure 19 and Figure 20 A lighting device according to an embodiment is shown.

[0114] Figure 19 An LED driver 710, a light source 720, and an LED control device 730 providing dimming functionality are shown. (See reference...) Figure 19 The LED driver 710 can be connected to an input harness 711 and an output harness 715. The input harness 711 may include multiple input terminals 712 to 714 for receiving AC power, and the output harness 715 may include multiple output terminals 716 to 719 for transmitting drive power generated by the LED driver 710 to a light source 720 comprising multiple LEDs. Among the multiple input terminals, a first input terminal 712 may be connected to the live wire terminal of the AC power, a second input terminal 713 may be connected to the PE terminal of the AC power, and a third input terminal 714 may be connected to the neutral wire terminal of the AC power. Among the multiple output terminals 716 to 719, a first output terminal 716 and a second output terminal 717 may be terminals for outputting drive power. For example, the voltage output to the first output terminal 716 may be greater than the voltage output to the second output terminal 717.

[0115] The LED driver 710 can generate drive power using AC power input through the input wiring harness 711. The LED driver 710 may include an EMI filter, a rectifier circuit, a converter circuit, and a controller. The rectifier circuit converts AC power to DC power, and the converter circuit can use the DC power to generate drive power. Depending on the application of the lighting device 700, the LED driver 710 may have waterproof and dustproof properties. In an embodiment, the LED driver 710 can be sealed with a sealing member to prevent the penetration of moisture and dust.

[0116] In one embodiment, the LED driver 710 can output a constant current to drive an LED connected to the output harness 715, and the magnitude of the constant current can be determined by a controller of the LED driver 710. The controller can provide a dimming function for adjusting the magnitude of the constant current output from the LED driver 710 within a rated current range. The controller can be configured according to the above reference... Figure 18 The dimming control terminals DIM+ and DIM- are described as inputs to dimming control signals to adjust the magnitude of a constant current.

[0117] Reference Figure 19 The light source 720 and LED control device 730 can be connected to the output harness 715. The LED control device 730 may include a power supply 731, a controller 732, a switching device 733, and a dimming controller 734. When the controller 732 receives a control command, including a dimming command for changing the brightness of the light output from the light source 720, from an external controller via wired / wireless communication, the controller 732 can convert the dimming command into a dimming control signal as a PWM signal and send the dimming control signal to the dimming controller 734. The dimming controller 734 can determine the level of the dimming control voltage based on the duty cycle of the dimming control signal and can output the dimming control voltage to the dimming control terminals DIM+ and DIM-. The magnitude of the constant current output from the LED driver 710 can be increased or decreased according to the magnitude of the dimming control voltage received through the dimming control terminals DIM+ and DIM-.

[0118] Figure 20 A lighting device 800 is shown, including an LED driver 810 that does not provide dimming functionality. (See reference...) Figure 20 The LED driver 810 may include an input harness 811 and an output harness 815. The input harness 811 may include a plurality of input terminals 812 to 814 for receiving AC power, and the output harness 815 may include a plurality of output terminals 816 and 817 for transmitting drive power generated by the LED driver to the LED. The output harness 815 may be connected to the light source 820 and the LED control device 830.

[0119] exist Figure 20 In the illustrated embodiment, the LED driver 810 may not provide a dimming function, and therefore, a dimming control terminal may not be provided in the LED driver 810. Therefore, in Figure 20 In the illustrated embodiment, the dimming function can be implemented by a controller 832 and a switching device 833. For example, the controller 832 can implement the dimming function by adjusting the duty cycle of a control signal used to turn on / off a switch included in the switching device 833.

[0120] According to the above embodiments, by connecting the LED control device to a drive node that can connect the LED driver and the light source, communication and dimming functions with an external controller can be achieved without replacing or upgrading the LED driver included in the existing lighting installation. Therefore, a lighting installation that reduces waste from already installed devices and increases user convenience can be realized.

[0121] According to an example embodiment, at least one of the components, elements, modules, or units (collectively referred to as "components" in this paragraph) indicated by the blocks in the accompanying drawings can be embodied as various numbers of hardware, software, and / or firmware structures performing the functions described above. These components may include, but are not limited to, an LED driver 20, a power supply 110, a controller 120, a switch driver SDV, and a dimming controller 734. According to an embodiment, at least one of these components may use a direct circuit structure such as a memory, processor, logic circuitry, lookup table, etc., which can perform the functions under the control of one or more microprocessors or other control devices. Furthermore, at least one of these components may be specifically embodied as a portion of a module, program, or code containing one or more executable instructions for performing a specified logical function, and at least one of these components may be executed by one or more microprocessors or other control devices. Additionally, at least one of these components may include a processor such as a central processing unit (CPU), microprocessor, etc., performing the functions, or may be implemented by a processor such as a central processing unit (CPU), microprocessor, etc., performing the functions. Two or more of these components may be combined into a single component, which performs all the operations or functions of the combined two or more components. Furthermore, at least a portion of the functionality of at least one of these components can be performed by another component. The functional aspects of the above embodiments can be implemented using algorithms that execute on one or more processors.

[0122] Although embodiments have been shown and described above, it will be apparent to those skilled in the art that modifications and variations may be made without departing from the scope of this disclosure as defined by the appended claims.

Claims

1. A light-emitting diode control device, comprising: A power supply is connected to a first drive node and a second drive node of a light-emitting diode driver, the light-emitting diode driver being configured to provide driving power to a light source comprising a plurality of light-emitting diodes; The controller is configured to operate by a first internal power voltage output from the power source and to receive control commands from an external controller. as well as A switching device, connected to the second drive node, is configured to operate via a second internal power voltage output from the power supply, and to control the brightness of the light source based on a control signal output from the controller in response to the control command. The power supply includes a first regulator configured to generate the first internal power voltage and a second regulator configured to generate the second internal power voltage. The first internal power voltage and the second internal power voltage have different magnitudes.

2. The LED control device according to claim 1, wherein, The switching device includes a switch connected between the light source and the second driving node and a switch driver configured to control the switch in response to the control signal.

3. The LED control device according to claim 2, wherein, The switch driver is configured to output a pulse width modulated signal to the switch having a frequency and duty cycle determined by the control signal.

4. The light-emitting diode control device according to claim 2, wherein, The controller is configured to adjust the duty cycle of the pulse width modulation signal output from the switch driver to the switch in response to a dimming command included in the control command.

5. The LED control device according to claim 4, wherein, The controller is configured to increase the duty cycle of the pulse width modulation signal based on the dimming command being a brightness increase command, and to decrease the duty cycle of the pulse width modulation signal based on the dimming command being a brightness decrease command.

6. The light-emitting diode control device of claim 1 further includes a current sensing circuit connected to the first driving node and configured to generate a sensing voltage by detecting the driving current input to the light source. in, The controller is configured to determine whether flickering occurs in the light source by comparing the amount of fluctuation in the sensed voltage with a reference value.

7. The light-emitting diode control device according to claim 6, wherein, The controller is configured to change the operating frequency of the switch included in the switching device and connected to the second drive node when the fluctuation of the sensed voltage exceeds the reference value.

8. The light-emitting diode control device according to claim 1, wherein, The first internal power voltage is less than the second internal power voltage.

9. The light-emitting diode control device according to claim 1, wherein, The switching device includes a first switch and a second switch connected in parallel between the second drive node and the light source, and Specifically, when the first switch is turned on, the second switch is turned off, and when the second switch is turned on, the first switch is turned off.

10. The light-emitting diode control device according to claim 9, wherein, The switching device includes a discharge circuit connected between the second switch and the second drive node or between the second switch and the light source.

11. The light-emitting diode control device according to claim 10, wherein, The first switch and the second switch are configured to be controlled by a single pulse width modulation signal.

12. The light-emitting diode control device according to claim 9, wherein, The first switch is configured to be controlled by a first pulse width modulation signal, and the second switch is configured to be controlled by a second pulse width modulation signal, the second pulse width modulation signal having a phase opposite to that of the first pulse width modulation signal and having a magnitude different from that of the first pulse width modulation signal.

13. The light-emitting diode control device according to claim 1, further comprising a dimming switch device, the dimming switch device being connected to the dimming control terminal of the light-emitting diode driver and configured to output a dimming control voltage to the dimming control terminal. in, The dimming switch is configured to convert the control signal generated by the controller into the dimming control voltage and output the dimming control voltage to the dimming control terminal.

14. A lighting device, comprising: A light-emitting diode driver is configured to generate driving power for driving a light-emitting diode using AC power, and to output the driving power through a first driving node and a second driving node; A light source comprising at least one string of light-emitting diodes, the at least one string of light-emitting diodes comprising the light-emitting diodes, and the light source being connected between the first driving node and the at least one light-emitting diode node; as well as A light-emitting diode (LED) control device, which is connected between the LED driver and the light source to the first driving node, the second driving node, and the at least one LED node. The LED control device includes a controller, a switching device, and a power supply. The controller is connected to communicate with an external controller. The switching device is connected between the at least one LED node and the second driving node and is configured to control the at least one LED string in response to a control signal output from the controller. The power supply is connected to the first driving node and the second driving node and is configured to output an internal power voltage for the operation of the controller and the switching device. The controller is configured to operate via a first internal power voltage output from the power supply, and the switching device is configured to operate via a second internal power voltage output from the power supply. The power supply includes a first regulator configured to generate the first internal power voltage and a second regulator configured to generate the second internal power voltage. The first internal power voltage and the second internal power voltage have different magnitudes.

15. The lighting device according to claim 14, wherein, The LED driver includes a rectifier circuit and a converter circuit, the rectifier circuit being configured to rectify the AC power and the converter circuit being configured to use the output of the rectifier circuit to generate the drive power.

16. The lighting device according to claim 14, wherein, The LED driver includes a first dimming control terminal and a second dimming control terminal, which are different from the first driving node and the second driving node, and is configured to adjust the magnitude of the current output to the first driving node based on the dimming control voltage input to the first dimming control terminal and the second dimming control terminal. The light-emitting diode control device further includes a dimming switch device configured to output the dimming control voltage in response to the control signal.

17. The lighting device according to claim 14, wherein, The switching device includes a first switch and a second switch connected in parallel between the at least one light-emitting diode node and the second driving node, and The controller is configured to alternately turn on the first switch and the second switch while the light source is operating.

18. The lighting device according to claim 17, wherein, The first switch is directly connected to the at least one LED node and the second driver node, and The second switch is connected to at least one of the at least one light-emitting diode node and the second driving node via a resistor or an inductor.

19. A light-emitting diode control device, comprising: A power supply, which is connected to a first output terminal and a second output terminal among a plurality of output terminals included in the output harness of the LED driver, and is configured to use the drive power output by the LED driver to generate a first internal power voltage and a second internal power voltage. The controller is configured to operate based on control commands received from an external controller, via the first internal power voltage, and generate a pulse width modulation signal as a control signal. as well as A switching device, connected to the second output terminal, is configured to operate via the second internal power voltage and to adjust the brightness of at least one of a plurality of light-emitting diodes operated by the drive power based on the control signal. The power supply includes a first regulator configured to generate the first internal power voltage and a second regulator configured to generate the second internal power voltage. The first internal power voltage and the second internal power voltage have different magnitudes.

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