WO2016074110A1 - 利用慢衰减磷光体以减少闪烁的发光二极管照明模块 - Google Patents

利用慢衰减磷光体以减少闪烁的发光二极管照明模块 Download PDF

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WO2016074110A1
WO2016074110A1 PCT/CN2014/001008 CN2014001008W WO2016074110A1 WO 2016074110 A1 WO2016074110 A1 WO 2016074110A1 CN 2014001008 W CN2014001008 W CN 2014001008W WO 2016074110 A1 WO2016074110 A1 WO 2016074110A1
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led
phosphor
emitting diode
light
lighting unit
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PCT/CN2014/001008
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French (fr)
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朱弘琦
沈毓仁
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钰瀚科技股份有限公司
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Publication of WO2016074110A1 publication Critical patent/WO2016074110A1/zh

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S2/00—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof

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  • the present invention relates to light emitting diode (LED) based illumination devices, and more particularly to an LED based illumination module that is driven by an alternating current (AC) voltage and has low light flicker.
  • LED light emitting diode
  • AC alternating current
  • LED-based lighting devices have been developed to replace conventional incandescent bulbs and fluorescent bulbs.
  • a plurality of LEDs are usually connected in series to form a LED-based illumination unit, and a plurality of LED-based illumination units can be further connected in series to form an illumination.
  • the operating voltage required for each luminaire is usually dependent on the forward voltage of the LEDs in the lighting unit, how many LEDs are in each lighting unit, how each lighting unit is connected to each other, and each lighting unit How to receive the voltage from the power supply in the lighting device.
  • some type of supply voltage conversion device is needed to convert a generally more common high voltage power supply to a lower voltage for providing one or more light emitting diode based lighting units. Because such a voltage conversion component is required, the efficiency of the LED-based lighting device is reduced, the cost is increased, and it is difficult to reduce its volume.
  • the lighting device can use a typical 120 volt or 240 volt AC power source without the need for a voltage conversion component.
  • the light-emitting diodes in the illumination device are divided into a plurality of light-emitting diode segments, each of which can be selectively turned on or off by a corresponding switch or current source, and operated by a controller. These switches or current sources are controlled by the rise or fall of the AC voltage.
  • LED-based lighting modules that operate from AC power and utilizes various control switches or circuits is that the brightness of the lighting module is proportional to the rectified voltage of the rectified AC voltage source. Because the brightness of the LED changes significantly from zero to the maximum voltage with the rectified AC voltage, the light of the LED has a strong flicker.
  • the light is emitted at a frequency of 100 Hz / 120 Hz
  • the brightness of the light of the diode can vary significantly.
  • the high flash of light is not only visible, but also causes people's anxiety about health issues.
  • 1 shows an LED-based illumination device powered by a rectified AC voltage source 101 and employing a switch mode drive circuit 102.
  • large capacitor C1 or C2 is used to improve voltage regulation.
  • FIG. 2 shows another LED-based illumination device powered by a rectified AC voltage source 201.
  • the LED-based illumination device has a linear LED drive unit 202 whose brightness varies with voltage.
  • a large capacitor 203 is used to reduce the voltage ripple of the rectified AC voltage source 201.
  • One disadvantage of using large capacitors is that LED-based lighting devices are therefore not durable because of the short life of large capacitors.
  • the present invention provides an LED-based lighting device that does not use a large capacitor, has low light flicker and high power factor.
  • the illuminating device according to the present invention supplies power from a rectified AC power source and cooperates with a screen cover or panel containing a slow-attenuating phosphor to cover all or part of the light output path of the illuminating device.
  • a screen or panel containing a slow-attenuating phosphor can be applied to a light-emitting diode-based lighting module that utilizes a linear drive circuit or a switch mode drive circuit. It is especially suitable for simple and low cost linear drive circuits for high efficiency and high power factor.
  • Figure 1 shows a conventional LED based illumination device with a switch mode drive circuit.
  • Figure 2 shows a conventional LED-based lighting device with a linear drive circuit.
  • FIG. 3 shows a light-emitting diode-based lighting module in accordance with the present invention, with a screen cover containing a slow-attenuating phosphor, completely covering its light output path.
  • FIG. 4 shows a light-emitting diode-based lighting module in accordance with the present invention, partially covering its light output path with a panel containing a slow-attenuating phosphor.
  • Figure 3 shows a light-emitting diode based illumination module powered by an alternating current source, having a brightness varying with voltage of the LED lighting unit 301.
  • the light output of the LED has a large brightness change and a high flicker.
  • the screen cover 302 is disposed to cover all paths of the light output of the LED lighting unit 301.
  • the screen cover 302 is made of a material containing a slow decaying phosphor to reduce variations in brightness.
  • the path of the light output of the light-emitting diode can also be covered only partially.
  • 4 shows an LED-based illumination module in which a partial path of the light output of the LED illumination unit 401 with varying brightness as a function of voltage is covered by a panel 402 comprising a slow attenuating phosphor.
  • the attenuation of the afterglow of the first-order phosphor can be expressed as:
  • ⁇ is the time constant of the decay and I 0 is the light intensity of the initial afterglow.
  • I 0 is the light intensity of the initial afterglow.
  • the effect of a slow decaying phosphor is similar to a low pass filter with a low frequency pole of 1/ ⁇ .
  • a change in brightness of at least 5% is a preferred effect.
  • the decay time constant should satisfy:
  • the 10% decay time of the phosphor can be calculated as:
  • the slow-attenuating phosphor is used to reduce flicker, as long as it is disposed on the output path of the light based on the LED lighting module, the phosphor can be placed anywhere in it to completely or partially cover the light output path.
  • Figures 3 and 4 show a screen or panel containing a slow decaying phosphor that can be placed in an LED based illumination module.
  • the slow decaying phosphor can also be applied directly to the light emitting diode or included in other optical components based on the LED lighting module.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

一种基于发光二极管的照明模块，包含一亮度随电压变化的发光二极管照明单元（301），以及安置于发光二极管照明单元（301）的光输出路径上的屏盖（302），来覆盖一部分或全部的输出光。屏盖（302）含有慢衰减的磷光体，可以抑制发光二极管照明单元（301）的亮度变化，以减少闪烁而不牺牲功率因子。

Description

利用慢衰减磷光体以减少闪烁的发光二极管照明模块 技术领域
本发明有关基于发光二极管(LED)的照明装置，尤其是一种以交流(AC)电压驱动并具有低灯光闪烁的基于发光二极管的照明模块。
背景技术
近年来，使用高电压的基于发光二极管的照明设备已被开发来取代传统的白热灯泡和荧光灯泡。为了提高基于发光二极管的照明装置的亮度，通常是将多个发光二极管串联在一起，形成一个基于发光二极管的照明单元，而且多个基于发光二极管的照明单元可以更进一步串联在一起，形成一个照明装置。每个照明装置所需要的工作电压通常是取决于照明单元里的发光二极管的正向电压，每个照明单元里有多少个发光二极管，每个照明单元是如何相互连接的，以及每个照明单元在照明装置里是如何接收来自电源的电压。
因此，在大多数的应用中，都需要某种类型的电源电压转换装置，来将一般较普遍的高电压电源转换成较低的电压，以提供给一个或多个基于发光二极管的照明单元。因为需要这样的一个电压转换组件，造成基于发光二极管的照明设备效率减低，成本增高，也难以减小其体积。
为了提高基于发光二极管的照明装置的效率和减小其体积，有许多技术已经被开发，以便照明装置不需要电压转换组件即可使用一般120伏或240伏的交流电源。一般而言，照明装置里的发光二极管被分隔成数个发光二极管段，每一发光二极管段可以由相对应的开关或电流源来选择性的接通或关闭，并且由一控制器随着操作交流电压的上升或下降，而控制这些开关或电流源。
使用交流电源供电，并利用各种控制开关或电路的基于发光二极管的照明模块，有一个主要缺点在于照明模块的亮度与经整流的交流电压源的整流电压成正比。因为发光二极管亮度随着经整流的交流电压从零到最大电压有显著的变化，从而使发光二极管的光有很强的闪烁。
如果没有良好的电压调节时，在100赫兹/120赫兹的频率下，发光 二极管的光的亮度会显著地变化。亮光的高闪烁不只是可见的，而且也造成人们对健康问题的忧虑。图1显示由整流的交流电压源101供电，并应用开关模式驱动电路102的基于发光二极管的照明装置。为了降低闪烁，如图1所示，大电容器C1或C2被用来改良电压调节。
图2显示由整流的交流电压源201供电的另一基于发光二极管的照明装置。该基于发光二极管的照明装置具有线性的发光二极管驱动单元202，其亮度随电压变化。一个大电容器203被用来降低经整流的交流电压源201的电压纹波。采用大电容器的一个缺点是，因为大电容器的寿命较短，基于发光二极管的照明装置也因此不能耐久。
使用大电容来降低灯光闪烁，也带来对基于发光二极管的照明装置的减少闪烁和提高功率因子之间的设计造成挑战。美国专利申请公开2014/0015441，2014/0042925和2014/0125238提供功率因子和闪烁之间进行折中的几个技巧。在基于发光二极管的照明产业里，对于降低照明装置的闪烁，而不牺牲它的寿命和功率因子的技术，有强烈需求。
发明内容
本发明提供一种不使用大电容器，具有低灯光闪烁及高功率因素的基于发光二极管的照明装置。根据本发明的照明装置，是由整流的交流电源供给电力，并配合一含慢衰减磷光体的屏盖或屏板，以覆盖照明装置的全部或部分的光输出路径。
根据本发明，因为照明装置的亮度变化在发光二极管的光经过含慢衰减磷光体的屏盖或屏板后减小了，于是由亮度变化造成的高闪烁被降低。含慢衰减磷光体的屏盖或屏板可以应用于利用线性驱动电路或开关模式驱动电路的基于发光二极管的发光模块。它特别适用于简单和低成本的线性驱动电路，以实现高效率和高功率因子。
附图说明
图1显示一传统的具开关模式驱动电路的基于发光二极管的照明装置。
图2显示一传统的具线性驱动电路的基于发光二极管的照明装置。
图3显示根据本发明的基于发光二极管的照明模块，以一含有慢衰减的磷光体的屏盖，完全覆盖其光的输出路径。
图4显示根据本发明的基于发光二极管的照明模块，以一含有慢衰减的磷光体的屏板，部分的覆盖其光的输出路径。
其中，附图标记说明如下：
101、201 整流的交流电源
102 开关模式驱动电路
202 亮度随电压变化的线性发光二极管驱动单元
203 电容器
301、401 亮度随电压变化的发光二极管照明单元
302 含有慢衰减的磷光体的屏盖
402 含有慢衰减的磷光体的屏板
具体实施方式
本说明书提供附图，使本发明更能进一步的被理解，同时附图也构成本说明书的一部分。该附图显示出了本发明的实施例，并与说明书一起，用来解释本发明原理。
图3显示由交流电源供电，具有亮度随电压变化的发光二极管照明单元301的基于发光二极管的照明模块。发光二极管的光输出有大的亮度变化及很高的闪烁。如图3所示，屏盖302被设置来覆盖该发光二极管照明单元301的光输出的所有路径。屏盖302以包含慢衰减磷光体的材料制成，来降低亮度的变化。
根据本发明，该发光二极管光输出的路径也可仅部分地被覆盖。图4显示一个基于发光二极管的照明模块，其中以包含慢衰减磷光体的屏板402覆盖亮度随电压变化的发光二极管照明单元401的光输出的部分路径。
根据磷光体的特性，一阶型磷光体的余辉的光强度的衰减可以表示为：
I(t)＝I0 x e-t/τ，
其中τ是衰减的时间常数，I0为初始余辉的光强度。为简单起见，我 们将使用上面的表达式作为近似的表述。但是应当注意的是，其它类型的磷光体也可以使用在本发明中。
从上面的表达式可以看出，慢衰减的磷光体的效果类似于一低频极点为1/τ的低通滤波器。为有效地减少闪烁，在120赫兹的频率下，亮度变化至少要降低5％才是较佳的效果。换句话说，在上述表达式中，衰减时间常数应当满足：
Figure PCTCN2014001008-appb-000001
也就是衰减时间常数τ≥0.436毫秒。根据此优选的衰减时间常数，磷光体的10％的衰减时间可以计算为：
ln10 x τ≥1.004毫秒。
根据本发明，慢衰减的磷光体是用来减少闪烁，只要是设置在基于发光二极管照明模块的光的输出路径上，磷光体可以设置于其中任何地方，使其完全或部分地覆盖光输出路径。图3和图4显示出一个含有慢衰减的磷光体的屏盖或屏板，可以被设置于基于发光二极管照明模块中。慢衰减的磷光体也可以直接涂覆在发光二极管上，或包含在基于发光二极管照明模块中的其它光学组件里。
虽然以上只藉由几个实施范例来描述本发明，然而熟悉本技术领域的人很明显的可以了解，仍有许多未描述的变通及修改，都在不偏离以下所定义的本发明的权利要求之内。

Claims (9)

  1. 一种基于发光二极管的照明模块，其特征在于，包括：
    一亮度随电压变化的发光二极管照明单元；和
    一安置于上述发光二极管照明单元的光输出路径上的慢衰减的磷光体；
    其中上述慢衰减的磷光体的10％的衰减时间大于1毫秒。
  2. 如权利要求1所述的基于发光二极管的照明模块，其特征在于，上述发光二极管照明单元所有光输出路径的一部分被上述慢衰减的磷光体覆盖。
  3. 如权利要求1所述的基于发光二极管的照明模块，其特征在于，上述发光二极管照明单元所有光输出路径全部被上述慢衰减的磷光体覆盖。
  4. 如权利要求1所述的基于发光二极管的照明模块，其特征在于，上述慢衰减的磷光体涂覆在上述发光二极管照明单元里的发光二极管上。
  5. 如权利要求1所述的基于发光二极管的照明模块，其特征在于，上述慢衰减的磷光体包含在安置于上述光输出路径上的一光学组件。
  6. 如权利要求1所述的基于发光二极管的照明模块，其特征在于，上述发光二极管照明单元包含一开关模式驱动电路。
  7. 如权利要求1所述的基于发光二极管的照明模块，其特征在于，上述发光二极管照明单元包含一线性驱动电路。
  8. 如权利要求1所述的基于发光二极管的照明模块，其特征在于，上述慢衰减的磷光体包含在覆盖上述发光二极管照明单元所有光输出路径的一屏盖。
  9. 如权利要求1所述的基于发光二极管的照明模块，其特征在于，上述慢衰减的磷光体包含在安置于上述发光二极管照明单元前方的一屏板。
PCT/CN2014/001008 2014-11-13 2014-11-13 利用慢衰减磷光体以减少闪烁的发光二极管照明模块 WO2016074110A1 (zh)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101208813A (zh) * 2005-06-28 2008-06-25 首尔Opto仪器股份有限公司 用于交流电力操作的发光装置
US20100096977A1 (en) * 2008-10-21 2010-04-22 Seoul Opto Device Co., Ltd. Ac light emitting device with long-persistent phosphor and light emitting device module having the same
CN101809355A (zh) * 2007-09-24 2010-08-18 奥斯兰姆有限公司 带有光缓冲器的照明装置
CN102237476A (zh) * 2010-04-29 2011-11-09 璨圆光电股份有限公司 交流式发光元件
CN202580715U (zh) * 2012-03-16 2012-12-05 叶军 一种无纹波闪烁的led灯具

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101208813A (zh) * 2005-06-28 2008-06-25 首尔Opto仪器股份有限公司 用于交流电力操作的发光装置
CN101809355A (zh) * 2007-09-24 2010-08-18 奥斯兰姆有限公司 带有光缓冲器的照明装置
US20100096977A1 (en) * 2008-10-21 2010-04-22 Seoul Opto Device Co., Ltd. Ac light emitting device with long-persistent phosphor and light emitting device module having the same
CN102237476A (zh) * 2010-04-29 2011-11-09 璨圆光电股份有限公司 交流式发光元件
CN202580715U (zh) * 2012-03-16 2012-12-05 叶军 一种无纹波闪烁的led灯具

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