WO2013017010A1 - 亮度和色温可调的led灯具 - Google Patents

亮度和色温可调的led灯具 Download PDF

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Publication number
WO2013017010A1
WO2013017010A1 PCT/CN2012/078514 CN2012078514W WO2013017010A1 WO 2013017010 A1 WO2013017010 A1 WO 2013017010A1 CN 2012078514 W CN2012078514 W CN 2012078514W WO 2013017010 A1 WO2013017010 A1 WO 2013017010A1
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WIPO (PCT)
Prior art keywords
led
module
tube group
constant current
lighting tube
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Application number
PCT/CN2012/078514
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English (en)
French (fr)
Inventor
黄喜荣
张斌
李晓宁
Original Assignee
北京同步科技有限公司
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Application filed by 北京同步科技有限公司 filed Critical 北京同步科技有限公司
Publication of WO2013017010A1 publication Critical patent/WO2013017010A1/zh

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Classifications

    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30Driver circuits
    • H05B45/37Converter circuits
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/10Controlling the intensity of the light

Definitions

  • LED lamp with adjustable brightness and color temperature This application claims priority from the Chinese application filed on August 2, 2011, with the application number 201110220321.9, and the invention titled "LED lamp with adjustable brightness and color temperature". The citations are incorporated herein by reference.
  • TECHNICAL FIELD The present invention relates to the field of lighting technologies, and more particularly to an LED (Light Emitting Diode) lamp with adjustable brightness and color temperature. Background technique
  • LED lamps capable of adjusting the color temperature have also come out.
  • LED lights with adjustable color temperature are realized by LED light-emitting tube sets of red, green and blue colors, and some are added with white LED light-emitting tube sets for enhancing brightness, and each color light-emitting tube group is A power supply and an LED lighting tube driving circuit and a color brightness controller are sequentially connected.
  • the four LED lighting tube group driving circuits are respectively controlled by the color brightness controller to output one signal to control the brightness and working state of the LED lighting tube groups of various colors, thereby realizing the adjustment of the color temperature of the LED lamps.
  • the main object of the present invention is to provide an LED lamp with adjustable brightness and color temperature, which can solve the problems of high production cost and high failure rate existing in the prior art.
  • the technical solution of the present invention is achieved as follows:
  • the invention provides an LED lamp with adjustable brightness and color temperature, comprising: a DC power supply module; an instruction receiving module, configured to receive a control instruction; and a control driving module, configured to output a first instruction according to the instruction received by the instruction receiving module
  • the PWM signal and the second PWM signal ; the first LED lighting tube group and the second LED lighting tube group having different color temperatures, the LEDs in the first LED lighting tube group and the second LED lighting tube group are all white LEDs, and the same LED
  • the color temperature of the LEDs in the LED group is the same;
  • the first dimming module is configured to control the working state and brightness of the first LED tube group according to the first PWM signal; and the second dimming module is configured to be used according to the second PWM The signal controls the operating state and brightness of the second LED tube group.
  • the PWM signal controls the working state and brightness of the two sets of LEDs of different color temperatures one-to-one. Because the color temperature is different, the working state and brightness of the two sets of white LEDs are respectively changed, so that the adjustment of the mixing ratio of the two different color temperatures can be realized. Thereby achieving the effect of changing the brightness and color temperature. In addition, since only two PWM signals are required to control two sets of white LEDs with different color temperatures one-to-one, the circuit is greatly simplified, thereby reducing production cost and failure rate, and reducing the occupation of system resources.
  • FIG. 1 is a schematic view showing an LED lamp with adjustable brightness and color temperature according to a first embodiment of the present invention
  • FIG. 2 is a schematic view showing an LED lamp with adjustable brightness and color temperature according to a second embodiment of the present invention
  • FIG. 3 is a circuit diagram showing a first (or second) LED lighting tube set, a first (or second) dimming module, and a first (or second) constant current module according to a third embodiment of the present invention
  • FIG. 4 is a circuit diagram showing an LED illuminator with adjustable brightness and color temperature according to a third embodiment of the present invention
  • Figure 5 is a circuit diagram showing an LED luminaire with adjustable brightness and color temperature in accordance with a fourth embodiment of the present invention.
  • the LED lamp includes: a DC power module 10, an instruction receiving module 20, a control driving module 30, and a first An LED lighting tube set 40, a second LED lighting tube set 50, a first dimming module 60 and a second dimming module 70, the connection relationship and functions of each module are as follows:
  • the DC power module 10 is configured to provide an operating voltage for controlling the driving module 30, the first LED tube group 40, and the second LED tube group 50;
  • the instruction receiving module 20 is configured to receive a control command, for example, a control command issued by the user by operating the remote controller or a control command issued by other means, which is not limited by the embodiment of the present invention;
  • the control driving module 30, and the DC power module 10 is connected to the instruction receiving module 20, and is configured to output two PWM (Pulse-Width Modulation) signals according to the control command received by the instruction receiving module 20, respectively: the first PWM signal and the second PWM signal. ;
  • the first LED lighting tube group 40 and the second LED lighting tube group 50 are respectively connected to the DC power module 10, wherein the LEDs in the first LED lighting tube group 40 and the second LED lighting tube group 50 are all white light. LED, and the color temperature of the LED in the same LED tube group is the same;
  • the first dimming module 60 is connected to the first LED lighting tube group 40 and the control driving module 30 for controlling the working state of the first LED lighting tube group 40 according to the first PWM signal (including turning on (ie, lighting or opening) ) and cutoff (ie no light or off) and brightness;
  • the first PWM signal including turning on (ie, lighting or opening)
  • cutoff ie no light or off
  • the second dimming module 70 is connected to the second LED lighting tube group 50 and the control driving module 30 for controlling the working state of the second LED lighting tube group 50 according to the second PWM signal (including turning on (ie, lighting or opening) ) and cutoff (ie no light or off) and brightness.
  • the second PWM signal including turning on (ie, lighting or opening)
  • cutoff ie no light or off
  • brightness a different color temperature mixing ratios can be realized. Adjust to achieve the effect of changing brightness and color temperature.
  • the circuit is greatly simplified, thereby reducing production cost and failure rate, and reducing the occupation of system resources.
  • the second embodiment of the present invention adds two constant current modules to the LED lamps:
  • the module 80 and the second constant current module 90 realize power supply for the two sets of LED lighting tubes in a linear constant current manner.
  • the first constant current module 80 is connected to the first dimming module 60, and the first constant current module 80 is configured to flow through the first LED when the first LED arc tube assembly 40 is operated (ie, turned on).
  • the current value of the LEDs in the LED lighting tube group 40 is maintained as the rated operating current value of the LEDs in the first LED lighting tube group 40; and the second constant current module 90 is connected to the second dimming module 70, the second constant current The module 90 is configured to maintain the current value of the LED flowing through the second LED lighting tube group 50 as the LED rating of the second LED lighting tube group 50 when the second LED lighting tube group 50 is operated (ie, turned on).
  • Working current value is configured to maintain the current value of the LED flowing through the second LED lighting tube group 50 as the LED rating of the second LED lighting tube group 50 when the second LED lighting tube group 50 is operated (ie, turned on).
  • the working characteristic of LEDs is that they need to be powered by constant current, so that they work in the best light efficiency and longest life. If the current flowing through the LED exceeds the rated current of the LED, the LED will be severely heated, which will greatly shorten the life of the LED. If it is less than the rated current, it will affect the luminous efficacy of the LED.
  • a constant current module is connected in series for the two sets of LEDs, and the constant current module can maintain the current value of the LED flowing through the LED lighting tube group when the LED lighting tube group connected in series is turned on. The rated working current value of the LED, so that the LED can work in an optimal state when it is turned on, effectively extending the life of the LED.
  • the constant current module can use a constant current diode (CRD, which is a two-stage junction field effect constant current device, can output a constant current over a wide voltage range, and has a high dynamic impedance), Constant current integrated circuits or other devices that can maintain a constant current are implemented. LED on When a constant current diode or constant current integrated circuit or other device that can maintain a constant current ensures that it works optimally, it can effectively extend the life of the LED.
  • the command receiving module may be an infrared receiving head or the like, as long as the control command can be received, which is not limited by the embodiment of the present invention.
  • FIG. 3 shows a first (or second) LED lighting tube set, a first (or second) dimming module, and a first (or second) constant current module in an LED lamp according to Embodiment 3 of the present invention.
  • Circuit diagram As shown in FIG. 3, in the third embodiment, any one of the LED lighting tubes of the first embodiment and the second embodiment may be composed of one or more LEDs connected in series, and any one of the dimming modules may be used. The effect tube is implemented. Any one of the constant current modules in the second embodiment can be implemented by using a constant current diode, and the constant current value of the constant current diode is equal to the rated working current value of the LED.
  • a plurality of LEDs are connected in a forward series manner, wherein the forward series means that the cathode of the previous LED is connected to the next LED.
  • the anode of the uppermost LED is connected to the positive pole of the DC power module (indicated by VCC in Figure 3), and the cathode of the lowermost LED is connected to the drain of the FET.
  • the source of the field effect transistor is connected to the anode of the constant current diode, and the cathode of the constant current diode is grounded.
  • the LED lamp of the third embodiment of the present invention is as shown in FIG. 4, and includes: VCC (ie, a DC power module), a white LED 1 with a high color temperature (ie, a first LED tube group), and a white LED 2 with a low color temperature (ie, Second LED tube group), constant current diode D3 (ie, first constant current module), D4 (ie, second constant current module), N-channel FET Q3 (ie, first dimming module), Q4 (ie, The second dimming module) controls a drive module (not shown) and an instruction receiving module (not shown).
  • VCC ie, a DC power module
  • a white LED 1 with a high color temperature ie, a first LED tube group
  • a white LED 2 with a low color temperature
  • ie, Second LED tube group ie, Second LED tube group
  • constant current diode D3 ie, first constant current module
  • D4 ie, second constant current module
  • the cathode of the last LED of LED1 is connected to the drain of the N-channel FET Q3 (or Q4), and the anode of the first LED is connected to the anode of the DC power module (VCC);
  • the source of Q3 (or Q4) is connected to the anode of constant current diode D3 (or D4), and the cathode of constant current diode D3 (or D4) is grounded to form a series circuit that controls current by a constant current diode.
  • the control driving module After the instruction receiving module receives the control instruction, the control driving module outputs two PWM signals having a certain duty ratio according to the control instruction: PWM1 having the first duty ratio (ie, the first PWM signal) and having the second duty The ratio of PWM2 (ie the second PWM signal). According to different control fingers Therefore, the duty ratios of the two PWM signals may be the same (ie, the first duty ratio is equal to the second duty ratio), or may be different (ie, the first duty ratio is not equal to the second duty ratio).
  • the control driving module outputs PWM1 to the gate of the FET Q3, and outputs PWM2 to the gate of the FET Q4 to respectively control the on and off of the two FETs, thereby controlling the conduction of the LED1 and the LED2.
  • the PWM signal has a certain duty ratio, which can control the on and off time of the FET, and thereby control the on and off time of the LED tube group (ie, the duty ratio of the current flowing through the LED).
  • the brightness of the LEDs 1 and 2 can be individually adjusted by changing the on and off times of the LEDs 1 and 2, respectively.
  • the color temperature of the two sets of LEDs of LED1 and LED2 is different, the color temperature of LED1 is recorded as Kl, the color temperature of LED2 is recorded as K2, and K1>K2), respectively, the brightness of LED1 and LED2 can be changed to achieve the effect of changing the color temperature, ie, The color temperature of the LED luminaire can vary between the highest color temperature K1 and the lowest color temperature K2.
  • the LED group LED1 (or LED2)
  • the FET Q3 drain, source
  • Q4 drain, source
  • the constant current diode D3 or D4
  • LED1 when PWM1 (or PWM2) is high voltage, LED1 (or LED2) is turned on (ie, illuminates), and when it is low voltage, LED1 (or LED2) is turned off (ie, it does not emit light). Therefore, the operating states of LED1 and LED2 can be controlled one-to-one by PWM1 having the first duty ratio and PWM2 having the second duty ratio, respectively, and due to the ratio of the on and off times of the LEDs (or LEDs) The duty cycle of the current determines the brightness of the LED. Therefore, the duty cycle of PWM1 (or PWM2) also determines the brightness of LED1 (or LED2).
  • the duty ratios of the currents of LED1 and LED2 are controlled one-to-one, and the operating states and brightness of LED1 and LED2 can be separately controlled, and the mixing ratio of two different color temperatures can be adjusted, thereby changing the brightness and The effect of color temperature.
  • the duty ratio of PWM1 is equal to the duty ratio of PWM2 (ie, the first duty ratio is equal to the second duty ratio)
  • the brightness of LED1 and LED2 are the same, and the color temperature of the LED lamp is the intermediate color temperature effect
  • PWM1 When the duty ratio is larger than the duty ratio of PWM2, the more LED1 is brighter than LED2, the higher the color temperature of the LED lamp, and the lower the color temperature of the LED lamp.
  • a voltage stabilizing circuit composed of resistors (R1 and R2) and Zener diodes (D1 and D2) and an NPN transistor (Q1 and Q2) are added. ). At this time, as shown in FIG. 5, in the fourth embodiment, based on the circuit of the third embodiment, a voltage stabilizing circuit composed of resistors (R1 and R2) and Zener diodes (D1 and D2) and an NPN transistor (Q1 and Q2) are added. ). At this time, as shown in FIG.
  • the LED lamp includes: VCC (ie, DC power module), white LED1 with high color temperature (ie, the first LED tube group), and white LED 2 with low color temperature (ie, the second LED tube group) ), the first of the constant current diode D3 (ie, the first constant current module), the D4 (ie, the second constant current module), the insulated gate N-channel FET Q3, the resistor R1, the Zener diode D1, and the NPN transistor Q1 a dimming module, a second dimming module composed of an insulated gate type N-channel field effect transistor Q4, a resistor R2, a Zener diode D2 and an NPN transistor Q2, a control driving module (not shown) and an instruction receiving module (not shown) .
  • VCC ie, DC power module
  • white LED1 with high color temperature ie, the first LED tube group
  • white LED 2 with low color temperature
  • the first of the constant current diode D3 ie, the first constant current module
  • the D4
  • the cathode of the last LED in LED1 is connected to the drain of N-channel FET Q3 (or Q4), the anode of the first LED and the DC power module (VCC)
  • the positive electrode is connected;
  • the source of the FET Q3 (or Q4) is connected to the anode of the constant current diode D3 (or D4), and the cathode of the constant current diode D3 (or D4) is grounded to form a series circuit for controlling the current by the constant current diode. .
  • PWM1 (ie the first PWM signal) and PWM2 (ie the second PWM signal) are the two PWM signals output by the drive control module, which are respectively output to the bases of the two transistors of Q1 and Q2;
  • D1 and R1 form a voltage regulator circuit, Q1 provides a constant voltage for the gate of Q3;
  • D2 and R2 form a voltage regulator circuit that provides a constant voltage to the gate of Q4 when Q2 is turned off; the emitter of Q1 is connected to the gate of Q3, and Q3 is controlled to conduct. And the cutoff; the emitter of Q2 is connected to the gate of Q4 to control the turn-on and turn-off of Q4.
  • the control driving module outputs two PWM signals having a certain duty ratio according to the control instruction: PWM1 having a first duty ratio and PWM2 having a second duty ratio, according to different The control command, the duty ratio of the two PWM signals may be the same (ie, the first duty ratio is equal to the second duty ratio), or may be different (ie, the first duty ratio is not equal to the second duty ratio).
  • the control driving module outputs PWM1 to the base of the NPN transistor Q1, and outputs PWM2 to the base of the NPN transistor Q2, and controls the two field effects one-to-one by controlling the conduction and the off of the two NPN transistors respectively.
  • the turn-on and turn-off of the tube which in turn controls the turn-on and turn-off of LED1 and LED2.
  • the PWM signal has a certain duty ratio, which can control the conduction and cut-off time of the FET, thereby controlling the conduction and turn-off time of the LED tube group, and realizing the brightness adjustment of the LED tube group. By individually changing the on and off times of LED1 and LED2, the brightness of LED1 and LED2 can be individually adjusted.
  • the color temperature of the two sets of LEDs of LED1 and LED2 is different (assuming that the color temperature of LED1 is K1, the color temperature of LED2 is K2, and K1>K2), changing the brightness of LED1 and LED2 respectively can achieve the effect of changing the color temperature, ie, The color temperature of the LED luminaire can vary between the highest color temperature K1 and the lowest color temperature K2.
  • the color temperature of the LED lamp is the intermediate color temperature fruit.
  • the constant current diode D3 (or D4) is connected in series, so the current flowing through the LED group LED 1 (or LED2) also coincides with the set current.
  • the voltage across the constant current diode D3 (or D4) increases. Because the gate voltage of Q3 (or Q4) is controlled by Zener diode D1 (or D2) and held at a constant voltage, the increase in voltage across constant current diode D3 (or D4) will drop the Q3 (or Q4) gate. The voltage between the source and the source increases the resistance between the drain and the source to protect the constant current diode D3 (or D4).
  • PWM1 or PWM2
  • the specific voltage value only needs to be greater than or equal to the turn-on voltage of the NPN transistor, for example, greater than 0.7V
  • Q1 or Q2
  • Q3 or Q4
  • the gate is low and Q3 (or Q4) is off.
  • the LED group LED1 or LED2 is turned off (no light).
  • LED1 when PWM1 (or PWM2) is high voltage, LED1 (or LED2) is turned off (ie, no light is emitted), and when it is low voltage, LED1 (or LED2) is turned on (ie, emits light). Therefore, the operating states of LED1 and LED2 can be controlled one-to-one by PWM1 having a first duty ratio and PWM2 having a second duty ratio, and, due to the on and off times of LEDs (or LED current) The duty cycle determines the brightness of the LED, so the duty cycle of PWM1 (or PWM2) also determines the brightness of LED1 (or LED2).
  • the duty ratios of the currents of LED1 and LED2 are controlled one-to-one, and the operating states and brightness of LED1 and LED2 can be separately controlled, and the mixing ratio of two different color temperatures can be adjusted, thereby changing the brightness and Color temperature effect fruit.
  • the duty ratio of PWM1 is equal to the duty ratio of PWM2 (ie, the first duty ratio is equal to the second duty ratio)
  • the brightness of LED1 and LED2 are the same, and the color temperature of the LED lamp is the intermediate color temperature effect
  • PWM2 When the duty ratio is larger than the duty ratio of PWM1, the more LED1 is brighter than LED2, the higher the color temperature of the LED lamp, and the lower the color temperature of the LED lamp.
  • the specific circuits of the first dimming module and the second dimming module in the third embodiment and the fourth embodiment may be arbitrarily combined. That is, in actual implementation, the first dimming module includes: a field effect transistor Q3, and the second dimming module includes: a field effect transistor Q4, a resistor R2, a Zener diode D2, and an NPN transistor Q2; or, first The dimming module comprises: a field effect transistor Q3, a resistor R1, a Zener diode D1 and an NPN transistor Q1, and the second dimming module comprises: a field effect transistor Q4.
  • the number of LEDs included in each LED lighting tube group can be determined according to actual needs and the output voltage of the DC power source. Specifically, when the output voltage Vc of the DC power module is determined, the number of LEDs in the LED tube group can be determined by the output voltage Vc of the DC power module according to the following formula (1):
  • max ⁇ number of LEDs ⁇ indicates the maximum number of LEDs in the LED tube group
  • Vc is the output voltage of the DC power module
  • VI indicates the conduction voltage of the constant current diode
  • V2 is the operating voltage of the LED.
  • the actual number N of LEDs in each LED tube group is less than or equal to the max ⁇ LED number ⁇ .
  • the efficiency is the highest; when the actual number of LEDs in each LED group is less than the number of max ⁇ LEDs ⁇ , the FET is added.
  • the power consumption reduces the energy-saving efficiency; when the actual number N of LEDs in each LED tube group is greater than the max ⁇ LED number ⁇ , the LED can not be fully turned on, reducing the luminous efficiency.
  • the output voltage Vc of the DC power module can also be determined by the number N of LEDs in the LED tube group according to the following formula (2):
  • Vc ⁇ ⁇ V2+V1 ( 2 )
  • N is the actual number of LEDs in the LED tube group
  • Vc is the DC power module.
  • the output voltage, VI represents the on-voltage of the constant current diode
  • V2 is the operating voltage of the LED.
  • the DC power supply is independently powered.
  • the DC power supply module can include two DC power supplies with different output voltages, one for powering the control drive module and the other for two LED lighting groups; or, DC power supply
  • the module can also be a DC power supply that can output two different voltages, respectively controlling the drive module and the two LED lighting tubes.
  • the LED lighting tube group can be powered by a higher voltage.
  • the difference in color temperature between the two may be different.
  • LED lamps of the above-described embodiments of the present invention having adjustable brightness and color temperature can be widely applied to daily lighting and ambient lighting.
  • a constant current module is connected in series for the two sets of LEDs, and the constant current module can maintain the current value of the LED flowing through the LED light-emitting tube group at the rated working current of the LED when the LED light-emitting tube group connected in series is turned on. The value, so that the LED can work in an optimal state when it is turned on, effectively extending the life of the LED.
  • modules or steps of the present invention described above can be implemented with a general purpose computing device, which can be centralized on a single computing device, or distributed. Alternatively, on a network of computing devices, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device, or they may be separately Each integrated circuit module, or a plurality of modules or steps thereof, are fabricated as a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software.

Abstract

本发明公开了一种亮度和色温可调的LED灯具,包括:直流电源模块;指令接收模块,用于接收控制指令;控制驱动模块,用于根据指令接收模块接收到的控制指令,输出第一PWM信号和第二PWM信号;色温不同的第一LED发光管组和第二LED发光管组,第一LED发光管组和第二LED发光管组中的LED均为白光LED,且同一个LED发光管组中的LED的色温相同;第一调光模块,用于根据第一PWM信号来控制第一LED发光管组的工作状态和亮度;以及第二调光模块,用于根据第二PWM信号来控制第二LED发光管组的工作状态和亮度。本发明的LED灯具降低了生产成本和故障率,减少了对系统资源的占用。

Description

亮度和色温可调的 LED灯具 本申请要求了 2011年 8月 2日提交的, 申请号为 201110220321.9, 发明 名称为 "亮度和色温可调的 LED灯具" 的中国申请的优先权, 其全部内容通 过引用结合在本申请中。 技术领域 本发明涉及照明技术领域, 更具体地, 涉及一种亮度和色温可调的 LED ( Light Emitting Diode, 发光二极管)灯具。 背景技术
近年来, 随着节能技术的推广, 节能型照明设计已成为照明灯具领域的 研究重点。 LED 由于其具有发光效率高、 节能效果好等优点, 在节能型照明 设计上受到了人们的重视。 使用 LED做照明灯来取代传统的照明灯, 是当今 照明技术领域的发展趋势。
为了满足不同的人在色温上的不同喜好, 能够调节色温的 LED灯具也陆 续问世。 目前, 可调节色温的 LED灯多釆用红、 绿、 蓝三种颜色的 LED发光 管组来实现, 有的为了加强亮度还加入了白色的 LED发光管组, 每种颜色的 发光管组均依次连接有电源和 LED发光管组驱动电路、 色彩亮度控制器。 由 色彩亮度控制器控制 4个 LED发光管组驱动电路分别输出 1路信号, 来控制 各种颜色的 LED发光管组的发光亮度及工作状态,实现 LED灯具的色温的调 节。
但是,上述现有技术的 LED灯具中,需要由色彩亮度控制器控制 4个 LED 发光管组驱动电路分别输出 1路信号, 由这 4路信号分别一对一地控制 4种 颜色的 LED发光管组, 电路十分复杂, 增加了生产的成本和故障率。 发明内容
有鉴于此,本发明的主要目的在于提供一种亮度和色温可调的 LED灯具, 能够解决现有技术中存在的生产成本和故障率高的问题。 为达到上述目的, 本发明的技术方案是这样实现的:
本发明提供了一种亮度和色温可调的 LED灯具, 包括: 直流电源模块; 指令接收模块, 用于接收控制指令; 控制驱动模块, 用于根据指令接收模块 接收到的控制指令, 输出第一 PWM信号和第二 PWM信号; 色温不同的第一 LED发光管组和第二 LED发光管组, 第一 LED发光管组和第二 LED发光管 组中的 LED均为白光 LED, 且同一个 LED发光管组中的 LED的色温相同; 第一调光模块, 用于根据第一 PWM信号来控制第一 LED发光管组的工作状 态和亮度; 以及第二调光模块, 用于根据第二 PWM信号来控制第二 LED发 光管组的工作状态和亮度。 路 PWM信号分别一对一地控制这两组不同色温的 LED的工作状态和亮度, 由于色温不同, 分别改变两组白色 LED的工作状态和亮度, 即可实现两种不 同色温混合比的调节, 从而达到改变亮度和色温的效果。 另外, 由于仅需两 路 PWM信号来一对一地控制两组色温不同的白色 LED, 大大简化了电路, 从而降低了生产成本和故障率, 减少了对系统资源的占用。 附图说明
此处所说明的附图用来提供对本发明的进一步理解, 构成本申请的一部 分, 本发明的示意性实施例及其说明用于解释本发明, 并不构成对本发明的 不当限定。 在附图中:
图 1 示出了根据本发明实施例一的亮度和色温可调的 LED 灯具的示意 图;
图 2 示出了根据本发明实施例二的亮度和色温可调的 LED 灯具的示意 图;
图 3示出了根据本发明实施例三的第一(或第二) LED发光管组、 第一 (或第二)调光模块和第一(或第二) 恒流模块的电路图;
图 4 示出了根据本发明实施例三的亮度和色温可调的 LED 灯具的电路 图; 图 5 示出了根据本发明实施例四的亮度和色温可调的 LED 灯具的电路 图。 具体实施方式
下面将参考附图并结合实施例, 来详细说明本发明。
实施例一
图 1 示出了根据本发明实施例一的亮度和色温可调的 LED 灯具的示意 图, 如图 1所示, 该 LED灯具包括: 直流电源模块 10、 指令接收模块 20、 控制驱动模块 30、 第一 LED发光管组 40、 第二 LED发光管组 50、 第一调光 模块 60和第二调光模块 70, 各个模块的连接关系和功能如下:
直流电源模块 10, 用于为控制驱动模块 30、 第一 LED发光管组 40和第 二 LED发光管组 50提供工作电压;
指令接收模块 20, 用于接收控制指令, 比如, 用户通过操作遥控器发出 的控制指令或者通过其他方式发出的控制指令, 本发明实施例对此不做限定; 控制驱动模块 30, 与直流电源模块 10和指令接收模块 20连接, 用于根 据指令接收模块 20 接收到的控制指令, 输出两路 PWM ( Pulse-Width Modulation, 脉冲宽度调制)信号, 分别称为: 第一 PWM信号和第二 PWM 信号;
色温不同的第一 LED发光管组 40和第二 LED发光管组 50,分别与直流 电源模块 10连接, 其中, 第一 LED发光管组 40和第二 LED发光管组 50中 的 LED均为白光 LED , 且同一个 LED发光管组中的 LED的色温相同;
第一调光模块 60, 与第一 LED发光管组 40和控制驱动模块 30连接, 用 于根据第一 PWM信号来控制第一 LED发光管组 40的工作状态(包括导通(即 发光或打开)和截止(即不发光或关闭))和亮度; 以及
第二调光模块 70, 与第二 LED发光管组 50和控制驱动模块 30连接, 用 于根据第二 PWM信号来控制第二 LED发光管组 50的工作状态(包括导通(即 发光或打开)和截止(即不发光或关闭))和亮度。 使用两路 PWM信号分别一对一地控制这两组不同色温的 LED的工作状态和 亮度, 由于色温不同, 分别改变两组白色 LED的工作状态和亮度, 即可实现 两种不同色温混合比的调节, 从而达到改变亮度和色温的效果。 另外, 由于 仅需两路 PWM信号来一对一地控制两组色温不同的白色 LED, 大大简化了 电路, 从而降低了生产成本和故障率, 减少了对系统资源的占用。
实施例二
如图 2所示, 为了保证两组 LED发光管组中的 LED在 LED导通时能够 工作在最佳状态, 本发明实施例二在 LED灯具中增设了两个恒流模块: 第一 恒流模块 80和第二恒流模块 90, 从而实现了以线性恒流方式为两组 LED发 光管组供电。
如图 2所示, 第一恒流模块 80与第一调光模块 60连接, 第一恒流模块 80用于在第一 LED发光管组 40工作(即导通)时, 将流经第一 LED发光管 组 40中的 LED的电流值维持为第一 LED发光管组 40中的 LED的额定工作 电流值; 以及, 第二恒流模块 90与第二调光模块 70连接, 第二恒流模块 90 用于在第二 LED发光管组 50工作 (即导通) 时, 将流经第二 LED发光管组 50中的 LED的电流值维持为第二 LED发光管组 50中的 LED的额定工作电 流值。
LED 的工作特点是需要釆用恒流供电的方式, 使其工作在最佳光效和最 长寿命的状态。 若流经 LED的电流超过了 LED的额定电流, 则 LED就会严 重发热, 进而会大大缩短 LED的寿命; 而若小于额定电流, 则会影响到 LED 的发光光效。 本发明实施例通过为两组 LED分别串联了一个恒流模块, 该恒 流模块能够在与其串联的 LED发光管组导通时,将流经该 LED发光管组中的 LED的电流值维持在 LED的额定工作电流值, 从而使得 LED在导通时能够 工作在最佳状态, 有效延长 LED的寿命。
在具体实施时, 恒流模块可以釆用恒流二极管 (CRD, 属于两端结型场 效应恒流器件, 能在很宽的电压范围内输出恒定的电流, 并具有很高的动态 阻抗)、 恒流集成电路或其他可以保持电流恒定的器件来实现。 在 LED 导通 时, 恒流二极管或恒流集成电路或其他可以保持电流恒定的器件保证其工作 在最佳状态, 能够有效地延长 LED的寿命。 指令接收模块可以是红外线接收 头等, 只要能够接收控制指令即可, 本发明实施例对此不做限定。
实施例三
图 3示出了根据本发明实施例三的 LED灯具中的第一(或第二) LED发 光管组、 第一(或第二)调光模块和第一(或第二) 恒流模块的电路图。 如 图 3所示, 在本实施例三中, 实施例一和实施例二中的任意一个 LED发光管 组可以由顺向串联的一个或多个 LED组成, 任意一个调光模块可以釆用场效 应管来实现, 实施例二中的任意一个恒流模块可以釆用恒流二极管来实现, 且恒流二极管的恒流值与 LED的额定工作电流值相等。
如图 3所示, 在第一 LED发光管组或第二 LED发光管组中, 多个 LED 釆用顺向串联的方式连接, 其中, 顺向串联是指上一个 LED的阴极连接下一 个 LED的阳极, 以此类推。 最上面的 LED的阳极连接直流电源模块(在图 3 中用 VCC表示) 的正极, 最下面的 LED的阴极连接场效应管的漏极。 而场 效应管的源极与恒流二极管的阳极连接, 恒流二极管的阴极接地。
则此时, 本发明实施例三的 LED灯具如图 4所示, 包括: VCC (即直流 电源模块 ),高色温的白色 LED1(即第一 LED发光管组 ),低色温的白色 LED2 (即第二 LED发光管组 ), 恒流二极管 D3 (即第一恒流模块 )、 D4 (即第二 恒流模块) , N沟道场效应管 Q3 (即第一调光模块 )、 Q4 (即第二调光模块 ), 控制驱动模块(未示出 )以及指令接收模块(未示出)。其中, LED1 (或 LED2 ) 中最后一只 LED的阴极与 N沟道场效应管 Q3 (或 Q4 )的漏极连接, 第一只 LED的阳极与直流电源模块(VCC ) 的正极连接; 场效应管 Q3 (或 Q4 ) 的 源极与恒流二极管 D3 (或 D4 )的阳极连接, 恒流二极管 D3 (或 D4 )的阴极 接地, 形成一个由恒流二极管控制电流的串联回路。
当指令接收模块接收到控制指令后, 控制驱动模块根据该控制指令输出 两路具有一定占空比的 PWM信号: 具有第一占空比的 PWM1 (即第一 PWM 信号)和具有第二占空比的 PWM2 (即第二 PWM信号)。 根据不同的控制指 令, 两路 PWM信号的占空比可以相同 (即第一占空比等于第二占空比), 也 可以不同(即第一占空比不等于第二占空比 )。控制驱动模块将 PWM1输出给 场效应管 Q3的栅极,将 PWM2输出给场效应管 Q4的栅极, 来分别控制这两 个场效应管的导通和截止, 进而控制 LED1和 LED2的导通和关断。 而且, PWM信号具有一定的占空比, 可以控制场效应管的导通和截止时间, 进而控 制 LED发光管组的导通和关断时间 (即流经 LED的电流的占空比), 实现了 LED发光管组的亮度调整。 通过分别改变 LED1和 LED2的导通、 截止时间 , 可以实现 LED1、 LED2的亮度的分别调整。 因为 LED1 与 LED2 两组发光管 的色温不同 叚设 LED1的色温记为 Kl , LED2的色温记为 K2,并且 K1>K2 ), 分别改变 LED1和 LED2的亮度就可以实现改变色温的效果, 即, LED灯具 的色温可以在最高色温 K1和最低色温 K2之间变化。 例如:
( 1 ) 当 LED1发光、 LED2不发光时, 此时 LED灯具的色温最高, 为
K1 ;
( 2 ) 当 LED2发光、 LED1 不发光时, 此时 LED灯具的色温最低, 为
K2;
( 3 )当 LED1和 LED2的亮度相同时, 此时 LED灯具色温为中间色温效 果。
具体地, 如图 4所示, 当 PWM1 (或 PWM2 )为高电压 (具体电压值大 于或等于场效应管的导通电压即可)时, 场效应管 Q3 (或 Q4 )导通。 Q3 (或 Q4 )导通后, 其漏极和源极之间的电阻受栅极的电压的控制。 因为 Q3 (或 Q4 ) 的导通, 恒流二极管 D3 (或 D4 )工作, 确保流过恒流二极管 D3 (或 D4 )的电流的值为设定的电流值(即为 D3 (或 D4 )的恒流值, 也即 LED的 额定工作电流值)。 因为发光二极管组 LED1 (或 LED2 )、 场效应管 Q3 (漏、 源极)(或 Q4 (漏、 源极))和恒流二极管 D3 (或 D4 )为串联连接, 所以流 过发光二极管组 LED1 (或 LED2 ) 的电流的值也与上述设定的电流值一致。
反之, 当 PWM1 (或 PWM2 )为低电压 (具体电压值小于场效应管的导 通电压即可) 时, 场效应管 Q3 (或 Q4 )进入截止状态, 则此时, 发光二极 管 LED1 (或 LED2 )截止(不发光)。
由上可知, PWM1 (或 PWM2 )为高电压时, LED1 (或 LED2 )导通(即 发光), 而为低电压时, LED1 (或 LED2 )截止(即不发光)。 因此, 可以通 过具有第一占空比的 PWM1和具有第二占空比的 PWM2来分别一对一地控制 LED1和 LED2的工作状态, 并且, 由于 LED的导通和截止时间的比例 (或 LED电流的占空比)会决定 LED的亮度, 因此, PWM1 (或 PWM2 )的占空 比也会决定 LED1 (或 LED2 ) 的亮度。 故, 通过 PWM1和 PWM2来分别一 对一地控制 LED1和 LED2的电流的占空比,能够分别控制 LED1和 LED2的 工作状态和亮度, 实现两种不同色温混合比的调节, 从而达到改变亮度和色 温的效果。 例如: 当 PWM1的占空比与 PWM2的占空比相等(即第一占空比 等于第二占空比 ) 时, LED1和 LED2的亮度相同, 此时 LED灯具色温为中 间色温效果; PWM1的占空比比 PWM2的占空比大得越多时, LED1比 LED2 亮得越多, 此时 LED灯具的色温越高, 相反, LED灯具的色温越低。
实施例四
如图 5 所示, 本实施例四在上述实施例三的电路基础上, 增加了由电阻 ( R1和 R2 )和稳压二极管( D1和 D2 )组成的稳压电路以及 NPN三极管( Q1 和 Q2 )。 则此时, 如图 5所示, LED灯具包括: VCC (即直流电源模块), 高 色温的白色 LED1 (即第一 LED发光管组 ),低色温的白色 LED2(即第二 LED 发光管组), 恒流二极管 D3 (即第一恒流模块)、 D4 (即第二恒流模块), 绝 缘栅型 N沟道场效应管 Q3、 电阻 R1、 稳压二极管 D1和 NPN三极管 Q1组 成的第一调光模块, 绝缘栅型 N沟道场效应管 Q4、 电阻 R2、 稳压二极管 D2 和 NPN三极管 Q2组成的第二调光模块, 控制驱动模块(未示出) 以及指令 接收模块(未示出)。 其中, 稳压二极管 Dl、 D2的稳压值为 6 ~ 10V; D3、 D4 为大电流恒流二极管 , 恒流值与 LED 的额定工作电流相同; 电阻 R1=R2=VCC/10000。
如图 5所示, LED1 (或 LED2 )中最后一只 LED的阴极与 N沟道场效应 管 Q3 (或 Q4 ) 的漏极连接, 第一只 LED的阳极与直流电源模块( VCC ) 的 正极连接; 场效应管 Q3 (或 Q4 )的源极与恒流二极管 D3 (或 D4 )的阳极连 接, 恒流二极管 D3 (或 D4 ) 的阴极接地, 形成一个由恒流二极管控制电流 的串联回路。 PWM1 (即第一 PWM信号 )和 PWM2 (即第二 PWM信号 )为 驱动控制模块输出的两路 PWM信号,分别输出到 Q1、Q2两只三极管的基极; D1与 R1组成稳压电路, 在 Q1截止时为 Q3的栅极提供一个恒定电压; D2 与 R2组成稳压电路, 在 Q2截止时为 Q4的栅极提供一个恒定电压; Q1的发 射极与 Q3的栅极相连,控制 Q3导通和截止; Q2的发射极与 Q4的栅极相连, 控制 Q4导通和截止。
则, 在指令接收模块接收到控制指令之后, 控制驱动模块根据控制指令 输出两路具有一定占空比的 PWM信号: 具有第一占空比的 PWM1和具有第 二占空比的 PWM2, 根据不同的控制指令, 两路 PWM信号的占空比可以相 同 (即第一占空比等于第二占空比), 也可以不同 (即第一占空比不等于第二 占空比)。 控制驱动模块将 PWM1输出给 NPN三极管 Q1的基极, 将 PWM2 输出给 NPN三极管 Q2的基极,通过分别控制这两个 NPN三极管的导通和截 止,来分别一对一地控制两个场效应管的导通和截止,进而控制 LED1和 LED2 的导通和关断。 而且, PWM信号具有一定的占空比, 可以控制场效应管的导 通和截止时间,进而控制 LED发光管组的导通和关断时间, 实现了 LED发光 管组的亮度调整。 通过分别改变 LED1和 LED2的导通、截止时间, 可以实现 LED1、 LED2的亮度的分别调整。 因为 LED1 与 LED2 两组发光管的色温不 同 (假设 LED1的色温记为 Kl , LED2的色温记为 K2, 并且 K1>K2 ), 分别 改变 LED1和 LED2的亮度就可以实现改变色温的效果, 即, LED灯具的色 温可以在最高色温 K1和最低色温 K2之间变化。 例如:
( 1 ) 当 LED1发光、 LED2不发光时, 此时 LED灯具的色温最高, 为
K1 ;
( 2 ) 当 LED2发光、 LED1 不发光时, 此时 LED灯具的色温最低, 为
K2;
( 3 )当 LED1和 LED2的亮度相同时, 此时 LED灯具色温为中间色温效 果。
具体地, 如图 5所示, 当 PWM1 (或 PWM2 )为低电平 (具体电压值小 于 NPN三极管的导通电压即可, 例如为 0 ) 时, Q1 (或 Q2 )截止, Q3 (或 Q4 ) 的栅极受稳压二极管 D1 (或 D2 )控制, 其电压为高电平, Q3 (或 Q4 ) 导通。 (^3 (或(^4 )导通后, 其漏极和源极之间的电阻受栅极电压的控制。 因 为 Q3 (或 Q4 )的导通, 恒流二极管 D3 (或 D4 )工作, 确保流过恒流二极管 D3 (或 D4 ) 的电流为设定的电流。 因为发光二极管组 LED1 (或 LED2 ) 与 场效应管 Q3 (漏、 源极)(或 Q4 (漏、 源极 ) )和恒流二极管 D3 (或 D4 )属 于串联连接, 所以流过发光二极管组 LED 1 (或 LED2 ) 的电流也与设定的电 流一致。
如果恒流二极管 D3 (或 D4 )的功耗加大, 则恒流二极管 D3 (或 D4 )两 端的电压会增加。 因为 Q3 (或 Q4 )的栅极电压由稳压二极管 D1 (或 D2 )控 制, 保持在一个恒定电压, 恒流二极管 D3 (或 D4 ) 两端的电压的增加会降 氐 Q3 (或 Q4 )栅极和源极之间的电压, 使其漏极和源极之间的电阻增大, 起到保护恒流二极管 D3 (或 D4 ) 的作用。
反之, 当 PWM1 (或 PWM2 )为高电平(具体电压值只需大于或等于 NPN 三极管的导通电压即可, 例如大于 0.7V )时, Q1 (或 Q2 )导通, Q3 (或 Q4 ) 的栅极为低电平, Q3 (或 Q4 )进入截止状态。 此时发光二极管组 LED1 (或 LED2 )截止(不发光)。
由上可知, PWM1 (或 PWM2 )为高电压时, LED1 (或 LED2 )截止 (即 不发光), 而为低电压时, LED1 (或 LED2 )导通(即发光)。 因此, 可以通 过具有第一占空比的 PWM1和具有第二占空比的 PWM2来分别一对一地控制 LED1和 LED2的工作状态, 并且, 由于 LED的导通和截止时间 (或 LED电 流的占空比)会决定 LED的亮度, 因此, PWM1 (或 PWM2 ) 的占空比也会 决定 LED1 (或 LED2 ) 的亮度。 故, 通过 PWM1和 PWM2来分别一对一地 控制 LED1和 LED2的电流的占空比,能够分别控制 LED1和 LED2的工作状 态和亮度, 实现两种不同色温混合比的调节, 从而达到改变亮度和色温的效 果。 例如: 当 PWM1的占空比与 PWM2的占空比相等(即第一占空比等于第 二占空比) 时, LED1和 LED2的亮度相同, 此时 LED灯具色温为中间色温 效果; PWM2的占空比比 PWM1的占空比大得越多时, LED1比 LED2亮得 越多, 此时 LED灯具的色温越高, 相反, LED灯具的色温越低。
显然, 上述实施例三和实施例四中的第一调光模块和第二调光模块的具 体电路, 可以任意组合。 也就是说, 在实际实施时, 第一调光模块包括: 场 效应管 Q3 , 而第二调光模块包括: 场效应管 Q4、 电阻 R2、 稳压二极管 D2 和 NPN三极管 Q2; 或者, 第一调光模块包括: 场效应管 Q3、 电阻 Rl、 稳 压二极管 D1和 NPN三极管 Q1 , 而第二调光模块包括: 场效应管 Q4。
在上述实施例三和实施例四中,每个 LED发光管组包含的 LED的数量可 以根据实际需求以及直流电源的输出电压来确定。 具体地, 在直流电源模块 的输出电压 Vc确定时, 可以按照以下公式( 1 ) 来通过直流电源模块的输出 电压 Vc来确定 LED发光管组中 LED的数量 N:
max{LED数量 }= ( Vc-Vl ) /V2 ( 1 )
其中, max{LED数量 }表示 LED发光管组中的 LED的数量最大值, Vc 为直流电源模块的输出电压, VI表示恒流二极管的导通电压, V2为 LED的 工作电压。 这样, 每个 LED 发光管组中的 LED 实际数量 N 小于或等于 max{LED 数量 }即可。 当每个 LED 发光管组中的 LED 实际数量 N 等于 max{LED数量 }时, 效率最高; 当每个 LED发光管组中的 LED实际数量 N 小于 max{LED数量 }时,会增加场效应管的功耗,降低节能效率; 当每个 LED 发光管组中的 LED实际数量 N大于 max{LED数量 }时,会使发光管不能完全 导通, 降低发光效率。
同样, 在 LED发光管组中的 LED的数量 N确定时, 也可以按照以下公 式( 2 )来通过 LED发光管组中 LED的数量 N来确定直流电源模块的输出电 压 Vc:
Vc =Ν χ V2+V1 ( 2 )
其中, N表示 LED发光管组中的 LED的实际数量, Vc为直流电源模块 的输出电压, VI表示恒流二极管的导通电压, V2为 LED的工作电压。 压的直流电源独立地供电, 此时, 直流电源模块中可以包括两个具有不同输 出电压的直流电源, 其中一个为控制驱动模块供电, 另一个为两个 LED发光 管组供电; 或者, 直流电源模块也可以为一个直流电源, 其能够输出两种不 同的电压,分别为控制驱动模块、以及两个 LED发光管组供电。另外, 当 LED 发光管组中的 LED的数量较多时,对 LED发光管组可以釆用更高的电压供电。
此外 ,在上述实施例一至实施例四中,只要第一 LED发光管组和第二 LED 发光管组的色温不同即可, 不过在实际应用中, 两者的色温的差距可以相差 得大一些, 色温差距越大, LED灯具的色温调节范围越大, 而且, 两个 LED 发光管组中色温较高的那组的色温越高, 色温较低的那组的色温越低, LED 灯具的色温调节效果越明显。
本发明上述实施例的亮度和色温可调的 LED灯具可以广泛地应用于日常 照明和环境照明。
从以上的描述中, 可以看出, 本发明上述的实施例实现了如下技术效果: ( 1 )釆用了两种色温不同的白色 LED发光管组, 并使用两路 PWM信号 分别一对一地控制这两组不同色温的 LED的工作状态和亮度,由于色温不同, 分别改变两组白色 LED的工作状态和亮度, 即可实现两种不同色温混合比的 调节, 从而达到改变亮度和色温的效果;
( 2 )由于仅需两路 PWM信号来一对一地控制两组色温不同的白色 LED, 大大简化了电路, 从而降低了生产成本和故障率, 减少了对系统资源的占用; ( 3 )通过为两组 LED 分别串联了一个恒流模块, 该恒流模块能够在与 其串联的 LED发光管组导通时, 将流经该 LED发光管组中的 LED的电流值 维持在 LED的额定工作电流值,从而使得 LED在导通时能够工作在最佳状态, 有效延长 LED的寿命。
显然, 本领域的技术人员应该明白, 上述的本发明的各模块或各步骤可 以用通用的计算装置来实现, 它们可以集中在单个的计算装置上, 或者分布 在多个计算装置所组成的网络上, 可选地, 它们可以用计算装置可执行的程 序代码来实现, 从而, 可以将它们存储在存储装置中由计算装置来执行, 或 者将它们分别制作成各个集成电路模块, 或者将它们中的多个模块或步骤制 作成单个集成电路模块来实现。 这样, 本发明不限制于任何特定的硬件和软 件结合。
以上所述仅为本发明的优选实施例而已, 并不用于限制本发明, 对于本 领域的技术人员来说, 本发明可以有各种更改和变化。 凡在本发明的精神和 原则之内, 所作的任何修改、 等同替换、 改进等, 均应包含在本发明的保护 范围之内。

Claims

权 利 要求 书
1、 一种亮度和色温可调的发光二极管 LED灯具, 其特征在于, 包括: 直流电源模块;
指令接收模块, 用于接收控制指令;
控制驱动模块, 用于根据所述指令接收模块接收到的控制指令, 输出第一 PWM信号和第二 PWM信号;
色温不同的第一 LED发光管组和第二 LED发光管组, 所述第一 LED发光 管组和第二 LED发光管组中的 LED均为白光 LED, 且同一个 LED发光管组中 的 LED的色温相同;
第一调光模块, 用于根据所述第一 PWM信号来控制所述第一 LED发光管 组的工作状态和亮度; 以及
第二调光模块, 用于根据所述第二 PWM信号来控制所述第二 LED发光管 组的工作状态和亮度。
2、 根据权利要求 1所述的 LED灯具, 其特征在于, 还包括:
第一恒流模块,用于在所述第一 LED发光管组工作时,将所述第一 LED发 光管组中的 LED的电流值维持为 LED的额定工作电流值; 以及
第二恒流模块,用于在所述第二 LED发光管组工作时,将所述第二 LED发 光管组中的 LED的电流值维持为 LED的额定工作电流值。
3、 根据权利要求 2所述的 LED灯具, 其特征在于,
所述第一恒流模块为恒流二极管 D3 , 所述恒流二极管 D3的阳极与所述第 一调光模块连接, 阴极接地, 且所述恒流二极管 D3 的恒流值与所述第一 LED 发光管组中的 LED的额定工作电流值相等; 以及
所述第二恒流模块为恒流二极管 D4, 所述恒流二极管 D4的阳极与所述第 二调光模块连接, 阴极接地, 且所述恒流二极管 D4 的恒流值与所述第二 LED 发光管组中的 LED的额定工作电流值相等。
4、 根据权利要求 1至 3中任一项所述的 LED灯具, 其特征在于, 所述第 一 LED发光管组和所述第二 LED发光管组中的每个 LED发光管组包含有顺向 串联的至少一个 LED, 并且, 所述每个 LED发光管组中一端的 LED的阳极与 所述直流电源模块的正极连接, 另一端的 LED的阴极与对应的调光模块连接。
5、根据权利要求 3所述的 LED灯具, 其特征在于, 所述第一调光模块为 N 沟道场效应管 Q3 , 所述场效应管 Q3的源极与所述恒流二极管 D3的阳极连接, 漏极与所述第一 LED发光管组连接, 栅极与所述控制驱动模块连接、 用于接收 所述第一 PWM信号。
6、根据权利要求 5所述的 LED灯具, 其特征在于, 所述第二调光模块为 N 沟道场效应管 Q4 , 所述场效应管 Q4的源极与所述恒流二极管 D4的阳极连接, 漏极与所述第二 LED发光管组连接, 栅极与所述控制驱动模块连接、 用于接收 所述第二 PWM信号。
7、 根据权利要求 6所述的 LED灯具, 其特征在于, 所述第一调光模块中 包含有: N沟道场效应管 Q3、 电阻 R1、 稳压二极管 D1和 NPN三极管 Q1; 其 中:
所述 N沟道场效应管 Q3的源极与所述恒流二极管 D3的阳极连接,漏极与 所述第一 LED发光管组连接,栅极与所述稳压二极管 D1的阴极和所述 NPN三 极管 Q1的发射极连接;
所述稳压二极管 D1的阳极接地;
所述电阻 R1 的一端与所述直流电源模块的正极连接, 另一端与所述 NPN 三极管 Q1的发射极和所述稳压二极管 D1的阴极连接;
所述 NPN三极管 Q1的基极与所述控制驱动模块连接、 用于接收所述第一 PWM信号, 集电极接地。
8、 根据权利要求 5或 7所述的 LED灯具, 其特征在于, 所述第二调光模 块中包含有: N沟道场效应管 Q4、 电阻 R2、稳压二极管 D2和 NPN三极管 Q2; 其中:
所述 N沟道场效应管 Q4的源极与所述恒流二极管 D4的阳极连接,漏极与 所述第二 LED发光管组连接,栅极与所述稳压二极管 D2的阴极和所述 NPN三 极管 Q2的发射极连接; 所述稳压二极管 D2的阳极接地;
所述电阻 R2的一端与所述直流电源模块的正极连接, 另一端与所述 NPN 三极管 Q2的发射极和所述稳压二极管 D2的阴极连接;
所述 NPN三极管 Q2的基极与所述控制驱动模块连接、 用于接收所述第二 PWM信号, 集电极接地。
9、 根据权利要求 1-3、 5-7中任一项所述的 LED灯具, 其特征在于, 所述 控制驱动模块为单片机, 所述单片机用于根据所述指令接收模块接收到的控制 指令,输出具有第一占空比的第一 PWM信号和具有第二占空比的第二 PWM信 号。
PCT/CN2012/078514 2011-08-02 2012-07-11 亮度和色温可调的led灯具 WO2013017010A1 (zh)

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