WO2022100730A1 - Procédé et appareil de commande de del, et appareil d'éclairage de del - Google Patents

Procédé et appareil de commande de del, et appareil d'éclairage de del Download PDF

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Publication number
WO2022100730A1
WO2022100730A1 PCT/CN2021/130612 CN2021130612W WO2022100730A1 WO 2022100730 A1 WO2022100730 A1 WO 2022100730A1 CN 2021130612 W CN2021130612 W CN 2021130612W WO 2022100730 A1 WO2022100730 A1 WO 2022100730A1
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WO
WIPO (PCT)
Prior art keywords
driving unit
led driving
led
control signal
brightness
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PCT/CN2021/130612
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English (en)
Chinese (zh)
Inventor
孙胜利
陈明
魏巍
郭宗渗
Original Assignee
青岛易来智能科技股份有限公司
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Publication of WO2022100730A1 publication Critical patent/WO2022100730A1/fr

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/32—Pulse-control circuits
    • H05B45/325—Pulse-width modulation [PWM]
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/10—Controlling the intensity of the light
    • H05B45/14—Controlling the intensity of the light using electrical feedback from LEDs or from LED modules
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H05B47/105—Controlling the light source in response to determined parameters
    • H05B47/14—Controlling the light source in response to determined parameters by determining electrical parameters of the light source

Definitions

  • Embodiments of the present invention relate to the field of smart homes, and in particular, to an LED control method, a device, and an LED lighting device.
  • the light-emitting diode (Light Emitting Diode, LED for short) driving dimming depth is not high enough to provide stable low-brightness lighting, and cannot meet the increasing demand of consumers for lighting.
  • Embodiments of the present invention provide an LED control method, a device, and an LED lighting device, so as to at least solve the problem of low LED driving dimming depth in the related art.
  • an LED control device including: an MCU (Microcontroller Unit, micro control unit), a first LED driving unit, and a second LED driving unit, wherein the MCU is respectively connected with the first LED driving unit. an LED driving unit, the second LED driving unit is connected,
  • the MCU is configured to, when receiving an adjustment instruction, control the first LED driving unit and/or the second LED driving unit according to the adjustment instruction, and control the first LED driving unit and/or the second LED driving unit through the first LED driving unit and/or the The second LED driving unit controls the brightness of the LED load;
  • the first LED driving unit for controlling the brightness of the LED load
  • the second LED driving unit is used to control the brightness of the LED load.
  • the MCU is further configured to send a first control signal to the first LED driving unit according to the adjustment instruction when receiving the adjustment instruction; and/or, after receiving the adjustment instruction , sending a second control signal to the second LED driving unit;
  • the first LED driving unit is further configured to control the brightness of the LED load according to the first control signal; and/or the second LED driving unit is further configured to control the LED load according to the second control signal. the brightness of the LED load.
  • the MCU is further configured to, when receiving the adjustment instruction, adjust the first duty cycle of the first control signal according to the brightness parameter carried in the adjustment instruction, and send the first LED to the first LED.
  • the driving unit sends a first control signal carrying the first duty cycle; and/or, when receiving the adjustment instruction, adjusts the second control signal of the second control signal according to the brightness parameter carried in the adjustment instruction a duty cycle, sending a second control signal carrying the second duty cycle to the second LED driving unit;
  • the first LED driving unit is further configured to control the brightness of the LED load according to the first duty cycle carried in the first control signal; and/or the second LED driving unit is further configured to use The brightness of the LED load is controlled according to the second duty cycle carried in the second control signal.
  • the MCU is further configured to, when receiving the adjustment instruction, if the brightness parameter is greater than 0 and less than a first preset value, send a message carrying the second LED driving unit to the second LED driving unit. the second control signal of the duty cycle;
  • the first control signal carrying the first duty cycle to the first LED driving unit and send the first control signal to the first LED driving unit.
  • the second LED driving unit sends the second control signal carrying the second duty cycle, wherein the first preset value is less than or equal to the second preset value;
  • the first control signal carrying the first duty cycle is sent to the first LED driving unit.
  • the device further includes: a power supply and an upper-end sampling resistor, wherein one end of the upper-end sampling resistor is respectively connected to the positive pole of the power supply and the output end of the first LED driving unit, and the other end of the upper-end sampling resistor is connected. One end is connected to the LED load, and the DC bus current of the power supply passes through the upper sampling resistor, passes through the LED load, and flows through the second LED drive unit to ground.
  • the upper sampling resistor includes at least a first resistor and a second resistor connected in parallel.
  • the first LED driving unit includes a constant current LED driving chip U2;
  • the second LED driving unit at least includes an N-channel MOS transistor Q4 and a triode Q2.
  • the second LED driving unit further includes a resistor R51, a resistor R52, a resistor R53, a resistor R54 and a diode, wherein,
  • the first end of the resistor R53 is connected to the MCU, the second end of the resistor R53 is respectively connected to the first end of the resistor R54 and the C pole of the transistor Q2, and the second end of the resistor R54 is connected to the first end of the resistor R54 respectively.
  • the terminal is connected to the E pole of the transistor Q2, the resistor R52 is connected in parallel with the resistor R51 and then connected to the E pole and B pole of the transistor Q2 in parallel, and the resistor R51 is connected to the N-channel MOS transistor Q4, all The diodes are connected in series.
  • an LED lighting device including the above-mentioned LED control device and an LED load, wherein the LED load is connected to the first LED driving unit and the second LED driving unit respectively. unit connection.
  • an LED control method comprising:
  • the first LED driving unit and/or the second LED driving unit are controlled according to the adjustment instruction, and the brightness of the LED load is controlled by the first LED driving unit and/or the second LED driving unit.
  • a computer-readable storage medium is also provided, where a computer program is stored in the storage medium, wherein the computer program is configured to execute any one of the above method embodiments when running steps in .
  • an electronic device comprising a memory and a processor, wherein the memory stores a computer program, the processor is configured to run the computer program to execute any of the above Steps in Method Examples.
  • an adjustment instruction is received; the first LED driving unit and/or the second LED driving unit are controlled according to the adjustment instruction, and the first LED driving unit and/or the second LED driving unit are controlled by the first LED driving unit and/or the second LED driving unit Controlled by the LED drive unit, so as to complete the dimming or dimming of the LED load, which can solve the problem of low dimming depth of the LED drive in the related art.
  • the first LED drive unit and/or the second LED drive unit controls and adjusts the LED load. The brightness increases the LED driver dimming depth.
  • FIG. 1 is a flowchart of an LED control method according to an embodiment of the present invention.
  • FIG. 2 is a block diagram 1 of an LED control device according to an embodiment of the present invention.
  • FIG. 3 is a block diagram of an LED control device according to an alternative embodiment of the present invention.
  • FIG. 4 is a block diagram of an LED lighting device according to an embodiment of the present invention.
  • FIG. 5 is a schematic diagram of an LED lamp control circuit according to an embodiment of the present invention.
  • FIG. 6 is a schematic diagram of the corresponding relationship between current and PWM according to an embodiment of the present invention.
  • FIG. 7 is a second block diagram of an LED control apparatus according to an embodiment of the present invention.
  • FIG. 1 is a flowchart of an LED control method according to an embodiment of the present invention. As shown in FIG. 1 , the flowchart includes the following steps:
  • Step S102 receiving an adjustment instruction
  • Step S104 controlling the first LED driving unit and/or the second LED driving unit according to the adjustment instruction, and controlling the brightness of the LED load through the first LED driving unit and/or the second LED driving unit.
  • steps S102 to S104 receive an adjustment instruction; control the first LED driving unit and/or the second LED driving unit according to the adjustment instruction, and control the first LED driving unit and/or the second LED driving unit through the first LED driving unit and/or the second LED driving unit
  • Two LED drive units control the brightness of the LED load, so as to complete the dimming or dimming of the LED load, which can solve the problem of the low dimming depth of the LED drive in the related art.
  • the first LED drive unit drives and/or the second LED drive unit Controlling and adjusting the brightness of the LED load improves the dimming depth of the LED driver.
  • step S104 may specifically include:
  • the brightness parameter carried in the instruction adjusts the first duty cycle of the first control signal; sends the first control signal carrying the first duty cycle to the first LED driving unit;
  • the brightness of the LED load is controlled according to the first control signal within the first brightness range, specifically, according to the first duty carried in the first control signal within the first brightness range than controls the brightness of the LED load.
  • step S106 may specifically include:
  • the brightness of the LED load is controlled according to the second control signal within the second brightness range, and specifically, the brightness of the LED load is controlled according to the second duty cycle carried in the second control signal within the second brightness range
  • the brightness parameter in this embodiment may be used to characterize the first brightness range and the second brightness range, and may be the same numerical value or proportional relationship.
  • sending a first control signal to the first LED driving unit, and/or sending a second control signal to the second LED driving unit may further include: if the brightness parameter is greater than 0 , and is less than the first preset value, send the second control signal carrying the second duty cycle to the second LED driving unit; if the brightness parameter is greater than the first preset value and less than For the second preset value, sending the first control signal carrying the first duty cycle to the first LED driving unit and sending the second LED driving unit the first control signal carrying the second duty cycle The second control signal, wherein, the first preset value is less than or equal to the second preset value; if the brightness parameter is greater than the second preset value, send a carry to the first LED driving unit the first control signal of the first duty cycle.
  • the maximum value of the first brightness range is greater than the maximum value of the second brightness range, and the minimum value of the first brightness range is greater than the minimum value of the second brightness range; optionally, the first brightness range The minimum value of is less than or equal to the maximum value of the second luminance range.
  • FIG. 2 is a block diagram 1 of an LED control device according to an embodiment of the present invention. As shown in FIG. 2 , it includes: an MCU22, a first LED driving unit 23, a Two LED driving units 24, wherein the MCU 22 is connected to the first LED driving unit 23 and the second LED driving unit 24, respectively,
  • the MCU 22 is configured to control the first LED drive unit 23 and/or the second LED drive unit 24 according to the adjustment instruction when receiving the adjustment instruction, and control the first LED drive unit 23 and/or the second LED drive unit 24 according to the adjustment instruction. /or the second LED driving unit 24 controls the brightness of the LED load;
  • the first LED driving unit 23 is used to control the brightness of the LED load
  • the second LED driving unit 24 is used to control the brightness of the LED load.
  • FIG. 3 is a block diagram of an LED control device according to an optional embodiment of the present invention.
  • the system further includes a power supply 21 , wherein the power supply 21 is connected to the MCU 22 and the first LED driving unit 23 respectively. , the second LED driving unit 24 is connected, and the power supply 21 is used for supplying power to the MCU 22 and the LED load.
  • the MCU 22 is further configured to send a first control signal to the first LED driving unit 23 when receiving the adjustment instruction; and/or, when receiving the adjustment instruction, send a first control signal to the first LED driving unit 23
  • the second LED driving unit 24 sends a second control signal
  • the first LED driving unit 23 is further configured to control the brightness of the LED load according to the first control signal; and/or the second LED driving unit 24 is further configured to control the brightness of the LED load according to the second control signal Control the brightness of the LED load.
  • the MCU22 is further configured to, when receiving the adjustment instruction, adjust the first duty cycle of the first control signal according to the brightness parameter carried in the adjustment instruction, and send the first LED to the first LED.
  • the driving unit 23 sends a first control signal carrying the first duty cycle; and/or, when receiving the adjustment instruction, adjusts the first control signal of the second control signal according to the brightness parameter carried in the adjustment instruction.
  • Two duty cycles sending a second control signal carrying the second duty cycle to the second LED driving unit 24;
  • the first LED driving unit 23 is further configured to control the brightness of the LED load according to the first duty cycle carried in the first control signal; and/or, the second LED driving unit 24, It is also used for controlling the brightness of the LED load according to the second duty cycle carried in the second control signal.
  • the MCU 22 is further configured to, when receiving the adjustment instruction, if the brightness parameter is greater than 0 and less than a first preset value, send a message to the second LED driving unit 24 that carries the the second control signal with two duty cycles;
  • the second LED driving unit 24 sends the second control signal carrying the second duty cycle, wherein the first preset value is less than or equal to the second preset value;
  • the first control signal carrying the first duty cycle is sent to the first LED driving unit 23 .
  • the device further includes: a power supply and an upper sampling resistor, wherein one end of the upper sampling resistor is connected to the positive pole of the power supply 21 and the output end of the first LED driving unit 23 respectively, and the other end is connected to the LED load.
  • the DC bus current of the power supply 21 passes through the upper sampling resistor, passes through the LED load, and flows through the second LED driving unit 24 to ground.
  • the upper sampling resistor includes at least a first resistor and a second resistor connected in parallel.
  • the first LED driving unit 23 includes a constant current LED driving chip U2;
  • the second LED driving unit 24 at least includes an N-channel MOS transistor Q4 and a triode Q2.
  • the second LED driving unit 24 further includes a resistor R51, a resistor R52, a resistor R53, a resistor R54 and a diode, wherein,
  • the first end of the resistor R53 is connected to the MCU22, the second end of the resistor R53 is respectively connected to the first end of the resistor R54 and the C pole of the transistor Q2, and the second end of the resistor R54 is connected to the first end of the resistor R54 respectively.
  • the terminal is connected to the E pole of the transistor Q2, the resistor R52 is connected in parallel with the resistor R51 and then connected to the E pole and B pole of the transistor Q2 in parallel, and the resistor R51 is connected to the N-channel MOS transistor Q4, all The diodes are connected in series.
  • FIG. 4 is a block diagram of an LED lighting device according to an embodiment of the present invention. As shown in FIG. 4 , it includes the above-mentioned LED control device and an LED load, wherein , the LED loads are respectively connected to the first LED driving unit 23 and the second LED driving unit 24 .
  • the LED loads include cool-color LED loads and/or warm-color LED loads.
  • FIG. 5 is a schematic diagram of an LED lamp control circuit according to an embodiment of the present invention. As shown in FIG. 5 , it includes two independent LED driving units (ie, the above-mentioned first LED driving unit and second LED driving unit) and LED loads.
  • the first drive is a constant current LED driver chip U2;
  • the second drive is a linear LED drive composed of Q4 and Q2;
  • PWM_WW Pulse Width Modulation, pulse width modulation
  • PWM_NL is: a linear drive Control signal; among them, WW+ and WW- connect the light board, that is, the LED load;
  • PWM_WW controls the size of the constant current of U2, and PWM_NL controls the size of the linear drive current.
  • the U2 constant current drive controls the LED light from 100% brightness to 10% brightness, and the linear drive light adjustment range is from 12% brightness to the lowest brightness (one thousandth or even one thousandth of the brightness); if the U2 constant current is used alone The driver cannot achieve deep dimming. If the linear driver is used alone, it cannot meet the driving requirements of medium and high brightness.
  • the brightness is driven by U2 constant current driver, and from 12% to lower brightness, the linear driver composed of Q4 and Q2 is used for driving.
  • the constant current driver and the linear driver are driven at the same time.
  • Two independent LED drivers work together to achieve two-stage dimming, which can not only meet the needs of high brightness, but also achieve deep dimming at low brightness.
  • the U2 current sampling adopts the upper end sampling.
  • the DC bus current first flows through the sampling resistor, and then the two ends of the LED load or the sampling resistor are not directly connected to GND.
  • the sampling resistor in the embodiment of the present invention adopts upper sampling, that is, an upper sampling resistor.
  • the current on the sampling resistor is the sum of the currents flowing through the two drivers.
  • FIG. 6 is a schematic diagram of the corresponding relationship between current and PWM according to an embodiment of the present invention. As shown in FIG. 6 , the minimum output current of the constant current drive U2 is less than or equal to the maximum current of the linear drive, so that the two drives are effectively connected to avoid the dimming process. The LED flashes in the middle.
  • the linear drive When dimming from 100% to low brightness, the linear drive can be turned on at the same time at any time when the constant current drive current of U2 is greater than the maximum current of the linear drive; in this way, the brightness of the lamp will not change because one linear drive is turned on.
  • the upper-end sampling reflects the sum of the output currents of the two drivers, one output current increases, and the other output current decreases, so the total current flowing through the load always follows the current of the sampling resistor; but if it is the lower-end sampling, Because the lower-end sampling does not reflect the output current of the linear drive, when working at the same time, the total current flowing through the load will change, becoming the sum of the current through U2 and the current through the linear drive, and the brightness of the LED changes is not smooth enough. During the adjustment process Brightness jumps will appear.
  • the PWM control signal is sent by the MCU to control the size of the LED drive current. Specifically, the duty cycle of PWM_WW decreases continuously, and the brightness of the lamp gradually dims at this time, while the duty cycle of PWM_NL is always 100%. The duty cycle of PWM_WW is reduced. When the two drive currents are coincident, turn off PWM_WW directly, which is 0%; start to reduce the duty cycle of PWM_NL for linear drive until it reaches the lowest brightness; thus, the brightness from 100% to 1/10,000 brightness seamless connection.
  • the embodiment of the present invention can realize the seamless connection from the lowest brightness of linear driving to 100% brightness.
  • PWM_NL gradually increases, when the two driving currents overlap, the duty cycle corresponding to PWM_WW is started, and then the PWM_WW is gradually increased.
  • the duty cycle is up to 100% or when the duty cycle of PWM_NL is adjusted from the minimum to 100%, then the corresponding current PWM_WW corresponding to a large duty cycle is started.
  • the duty cycle of PWM_NL is 100%, the current of the single night light and the single use
  • the PWM_WW duty cycle is 12%, the current driven by that LED is the same.
  • the embodiment of the present invention may be one output, specifically DC-DC constant current drive circuit + linear drive circuit + LED load, and in an optional embodiment, may also be DC-DC constant current drive circuit + pull-up sampling resistor +Linear drive circuit+LED load.
  • the embodiment of the present invention may also include two or more outputs of cold and warm, specifically, DC-DC constant current drive circuit + cool color LED load, DC-DC constant current drive circuit + linear drive circuit + warm color LED load; linear
  • the drive circuit can be connected to a cool-colored load and/or a warm-colored LED load, usually a warm-colored LED load, because warm-colored LEDs are more suitable for use in the night mode of lamps at low brightness.
  • a pull-up sampling resistor is also added.
  • the RGB color light LED load can also be increased. Since the color light is generally used as an ambient light, the need for deep dimming is not strong.
  • an LED control device is also provided, and the device is used to realize the above-mentioned embodiments and preferred implementation manners, and what has been described will not be repeated.
  • the term "module” may be a combination of software and/or hardware that implements a predetermined function.
  • the apparatus described in the following embodiments is preferably implemented in software, implementations in hardware, or a combination of software and hardware, are also possible and contemplated.
  • FIG. 7 is a second block diagram of an LED control device according to an embodiment of the present invention, as shown in FIG. 7 , including:
  • a receiving module 72 configured to receive an adjustment instruction
  • the control module 74 is configured to control the first LED driving unit and/or the second LED driving unit according to the adjustment instruction, and is controlled by the first LED driving unit and/or the second LED driving unit.
  • control module 74 includes:
  • a sending sub-module configured to send a first control signal to the first LED driving unit according to the adjustment instruction, where the first control signal is used to instruct the first LED driving unit to control the brightness of the LED load; and /or send a second control signal to the second LED driving unit, where the second control signal is used to instruct the second LED driving unit to control the brightness of the LED load.
  • the sending sub-module is further configured to adjust the first duty ratio of the first control signal according to the brightness parameter carried in the adjustment instruction, and send a message carrying the first control signal to the first LED driving unit.
  • the second control signal of two duty cycles.
  • the sending sub-module is further configured to, if the brightness parameter is greater than 0 and less than a first preset value, send the second LED driving unit carrying the second duty cycle to the second LED driving unit.
  • the first control signal carrying the first duty cycle to the first LED driving unit and send the first control signal to the first LED driving unit.
  • the second LED driving unit sends the second control signal carrying the second duty cycle, wherein the first preset value is less than or equal to the second preset value;
  • the first control signal carrying the first duty cycle is sent to the first LED driving unit.
  • the above modules can be implemented by software or hardware, and the latter can be implemented in the following ways, but not limited to this: the above modules are all located in the same processor; or, the above modules can be combined in any combination The forms are located in different processors.
  • Embodiments of the present invention further provide a computer-readable storage medium, where a computer program is stored in the storage medium, wherein the computer program is configured to execute the steps in any of the above method embodiments when running.
  • the above-mentioned storage medium may be configured to store a computer program for executing the following steps:
  • the above-mentioned storage medium may include but is not limited to: a USB flash drive, a read-only memory (Read-Only Memory, referred to as ROM), a random access memory (Random Access Memory, referred to as RAM), Various media that can store computer programs, such as removable hard disks, magnetic disks, or optical disks.
  • ROM Read-Only Memory
  • RAM Random Access Memory
  • An embodiment of the present invention further provides an electronic device, comprising a memory and a processor, where a computer program is stored in the memory, and the processor is configured to run the computer program to execute the steps in any of the above method embodiments.
  • the above-mentioned electronic device may further include a transmission device and an input-output device, wherein the transmission device is connected to the above-mentioned processor, and the input-output device is connected to the above-mentioned processor.
  • the above-mentioned processor may be configured to execute the following steps through a computer program:
  • modules or steps of the present invention can be implemented by a general-purpose computing device, which can be centralized on a single computing device, or distributed in a network composed of multiple computing devices Alternatively, they may be implemented in program code executable by a computing device, such that they may be stored in a storage device and executed by the computing device, and in some cases, in a different order than here
  • the steps shown or described are performed either by fabricating them separately into individual integrated circuit modules, or by fabricating multiple modules or steps of them into a single integrated circuit module.
  • the present invention is not limited to any particular combination of hardware and software.

Abstract

La présente invention concerne un procédé et un appareil de commande de DEL, et un appareil d'éclairage de DEL. Le procédé comprend les étapes consistant à : recevoir une instruction d'ajustement (S102) ; et commander une première unité d'entraînement de DEL et/ou une seconde unité d'entraînement de DEL en fonction de l'instruction d'ajustement, et commander la luminosité d'une charge de DEL au moyen de la première unité d'entraînement de DEL et/ou de la seconde unité d'entraînement de DEL (S104), de telle sorte que le problème dans l'état de la technique associé de la profondeur de gradation d'un dispositif d'entraînement de DEL n'étant pas élevé peut être résolu. La luminosité de la charge de DEL est commandée et ajustée au moyen de la première unité de commande de DEL et/ou de la seconde unité de commande de DEL, ce qui permet d'améliorer la profondeur de gradation du dispositif d'entraînement de DEL.
PCT/CN2021/130612 2020-11-13 2021-11-15 Procédé et appareil de commande de del, et appareil d'éclairage de del WO2022100730A1 (fr)

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CN202011273322.5A CN112188668A (zh) 2020-11-13 2020-11-13 Led控制方法、装置及led照明装置

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CN112188668A (zh) * 2020-11-13 2021-01-05 青岛易来智能科技股份有限公司 Led控制方法、装置及led照明装置

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CN107567131A (zh) * 2017-08-28 2018-01-09 盐城莱廷绍工业技术有限公司 一种led色温调节驱动装置
CN108419331A (zh) * 2018-02-06 2018-08-17 欧普照明股份有限公司 Led调光电路和调光方法
CN111542148A (zh) * 2020-04-27 2020-08-14 深圳深爱半导体股份有限公司 Led驱动模块
CN112188668A (zh) * 2020-11-13 2021-01-05 青岛易来智能科技股份有限公司 Led控制方法、装置及led照明装置

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