WO2012139310A1 - Led组件及采用led组件的led灯串 - Google Patents

Led组件及采用led组件的led灯串 Download PDF

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Publication number
WO2012139310A1
WO2012139310A1 PCT/CN2011/073343 CN2011073343W WO2012139310A1 WO 2012139310 A1 WO2012139310 A1 WO 2012139310A1 CN 2011073343 W CN2011073343 W CN 2011073343W WO 2012139310 A1 WO2012139310 A1 WO 2012139310A1
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Prior art keywords
led
resistor
switch
turned
standby
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PCT/CN2011/073343
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English (en)
French (fr)
Inventor
俞刚
郭东胜
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TCL China Star Optoelectronics Technology Co Ltd
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Shenzhen China Star Optoelectronics Technology Co Ltd
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Application filed by Shenzhen China Star Optoelectronics Technology Co Ltd filed Critical Shenzhen China Star Optoelectronics Technology Co Ltd
Priority to US13/143,131 priority Critical patent/US8669710B2/en
Priority to DE112011105147.6T priority patent/DE112011105147B4/de
Publication of WO2012139310A1 publication Critical patent/WO2012139310A1/zh
Anticipated expiration legal-status Critical
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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]
    • H05B45/40—Details of LED load circuits
    • H05B45/44—Details of LED load circuits with an active control inside an LED matrix

Definitions

  • the present invention relates to an LED assembly, and more particularly to an LED assembly that provides a reliable light source and an LED light string that employs the LED assembly.
  • the light source of the backlight module is mainly divided into a light emitting diode (LED) and a cold cathode fluorescent tube (CCFL). Because LEDs have the advantage of low power consumption, replacing cold cathode fluorescent tubes with light emitting diodes is the mainstream trend of the current backlight module industry.
  • LED light emitting diode
  • CCFL cold cathode fluorescent tube
  • a light string in which a plurality of light-emitting diodes are connected in series is used as a light source. Since the backlight module must provide a stable and uniform surface light source, once one of the LEDs is blown, it must be replaced immediately to maintain the uniformity of the surface light source. Therefore, the maintenance frequency or durability of the backlight module string is bound to be limited by the working life of each LED.
  • the invention provides an LED assembly and an LED light string using the LED assembly to solve the problem of insufficient durability of the backlight module light string.
  • An LED component is characterized in that: the LED component comprises an input end, an output end, a main LED, a standby LED and a switching module, and the switching module controls when the main LED is turned on The standby LED is turned off; when the main LED is blown, the standby LED is controlled to be turned on; the switching module includes a first FET, a second FET, a first resistor and a second resistor, a source of the first field effect transistor is connected to the cathode of the main LED and is grounded via a first resistor and a second resistor in sequence, a drain is connected to the output terminal, and a gate is grounded via the second resistor; a source of the second field effect transistor is connected to a cathode of the standby LED, a drain is connected to the output end, a gate is connected to a gate of the first switch, and a threshold voltage Vth1 and a second field of the first field effect transistor are The threshold voltage Vth2 of the effect transistor satisfies the following condition: Vth
  • An LED assembly includes an input end, an output end, a main LED, a standby LED and a switching module, an anode of the main LED is connected to the input end, and a cathode is connected to the cathode via the switching module
  • the output end, the anode of the standby LED is connected to the input end, and the cathode is connected to the output end via the switching module, the switching module controls the standby LED to be turned off when the main LED is turned on; the main LED is burned When it is off, the standby LED is turned on.
  • the switching module includes a first switch and a second switch, the first switch is connected to the cathode of the main LED and the output end, and the second switch is connected The cathode of the standby LED and the output end, when the main LED is turned on, the first switch is turned on, and the second switch is turned off; when the main LED is blown, the first switch is turned off, and the second switch is turned on.
  • the switching module further includes a first resistor and a second resistor, and the cathode of the main LED is grounded via the first resistor and the second resistor in sequence.
  • the switching module includes a first FET, a second FET, a first resistor and a second resistor, and the source of the first FET is connected.
  • the cathode of the main LED is grounded in sequence via a first resistor and a second resistor, the drain is connected to the output terminal, the gate is grounded via the second resistor; and the source of the second field effect transistor is connected.
  • the cathode of the standby LED is connected to the output terminal, and the gate is connected to the gate of the first switch.
  • the first and second field effect transistors are all P-channel metal oxide semiconductor field effect transistors.
  • the threshold voltage Vth1 of the first FET and the threshold voltage Vth2 of the second FET satisfy the following condition: Vth1>-(Vs1-Vf)R1/(R1+R2)> Vth2>-(Vs1-Vf), where Vs1 is the input voltage of the input terminal, Vf is the conduction voltage drop of the main LED and the standby LED, R1 is the resistance value of the first resistor, and R2 is the resistance of the second resistor. value.
  • An LED light string comprising a plurality of LED components connected in series, each LED component comprising an input end, an output end, a main LED, a standby LED and a switching module, and an anode connection of the main LED
  • the cathode is connected to the output end via the switching module
  • the anode of the standby LED is connected to the input end
  • the cathode is connected to the output end via the switching module
  • the switching module is in the main LED guide
  • the switching module includes a first switch and a second switch, the first switch is connected to the cathode of the main LED and the output end, and the second switch is connected The cathode of the standby LED and the output end, when the main LED is turned on, the first switch is turned on, and the second switch is turned off; when the main LED is blown, the first switch is turned off, and the second switch is turned on.
  • the switching module further includes a first resistor and a second resistor, and the cathode of the main LED is grounded via the first resistor and the second resistor in sequence.
  • the switching module includes a first FET, a second FET, a first resistor and a second resistor, and the source of the first FET is connected.
  • the cathode of the main LED is grounded in sequence via a first resistor and a second resistor, the drain is connected to the output terminal, the gate is grounded via the second resistor; and the source of the second field effect transistor is connected.
  • the cathode of the standby LED is connected to the output terminal, and the gate is connected to the gate of the first switch.
  • the first and second field effect transistors are all P-channel metal oxide semiconductor field effect transistors.
  • the plurality of LED components are L1, L2, ..., Li, ..., Ln, wherein n ⁇ 2, 1 ⁇ i ⁇ n, the first of each LED component Li
  • the threshold voltage Vth1 of the field effect transistor and the threshold voltage Vth2 of the second field effect transistor satisfy the following condition: Vth1>-(Vs1-i*Vf)R1/(R1+R2)>VTh2>-(Vs1-i*Vf), Wherein, Vs1 is the input voltage of the input terminal, Vf is the conduction voltage drop of the main LED and the standby LED, R1 is the resistance value of the first resistor, and R2 is the resistance value of the second resistor, Vs1-(n*Vf) >0.
  • the LED assembly of the present invention comprises a main LED, a standby LED and a switching module.
  • the switching module controls the standby LED to be turned off; until the main LED is blown. , control the standby LED to conduct. Therefore, the LED string using the LED assembly can continue to provide a stable light source when one of the main LEDs is blown, and has better durability.
  • the LED assembly of the present invention comprises a main LED, a standby LED and a switching module.
  • the switching module controls the standby LED to be turned off; until the main LED is blown, the standby LED is controlled to be turned on. Therefore, the LED string using the LED assembly can continue to provide a stable light source when one of the main LEDs is blown, and has better durability.
  • Figure 1 is a circuit diagram of a preferred embodiment of an LED assembly of the present invention.
  • Figure 2 is a circuit diagram of a preferred embodiment of the LED light string of the present invention.
  • FIG. 1 is a circuit diagram of a preferred embodiment of the LED assembly of the present invention.
  • the LED assembly L includes an input end (not labeled), an output end (not labeled), and an active LED 1.
  • the input receives an input voltage Vs1.
  • the output terminal outputs a voltage Vs2.
  • the anode of the primary LED 1 and the anode of the standby LED 2 are commonly connected to the input.
  • the main LED The conduction voltage drop between 1 and the standby LED 2 is Vf.
  • the switching module S is connected to the cathode of the main LED 1 and the cathode of the standby LED 2, and is used for the main LED 1 When the conduction is on, the standby LED 2 is turned off; when the main LED 1 is blown, the standby LED is controlled. 2 turns on.
  • the switching module S includes a first switch Q1 and a second switch Q1, and the first switch Q1 is connected to the cathode of the main LED 1 and the output end.
  • the first switch Q1 is kept turned on.
  • the first switch Q1 is disconnected due to a circuit interruption.
  • the second switch Q2 is connected to the standby LED
  • the cathode of the second electrode and the output terminal are turned on when the main LED 1 is blown, and the standby LED 2 is turned on.
  • the switching module S further includes a first resistor R1 and a second resistor R2.
  • the first switch Q1 is a first field effect transistor, preferably a P-channel metal oxide semiconductor field effect transistor (MOSFET), having a threshold voltage of Vth1.
  • MOSFET metal oxide semiconductor field effect transistor
  • the source of the first switch Q1 is connected to the main LED
  • the cathode of 1 is also grounded via the first resistor 103 and the second resistor 104 in sequence; the drain of the first switch Q1 is connected to the output terminal; the gate of the first switch Q1 is via the above
  • the second resistor 104 is grounded.
  • the second switch Q2 is a second field effect transistor, preferably a P-channel metal oxide semiconductor field effect transistor (MOSFET) having a threshold voltage of Vth2.
  • the source of the second switch Q2 is connected to the standby LED a cathode of 2; a drain of the second switch Q2 is connected to the output; a gate of the second switch Q2 is connected to a
  • the resistance value of the first resistor 103 is set to R1, and the resistance value of the second resistor 104 is R2.
  • the threshold voltage Vth1 of the first switch Q1 satisfies: Vth1>-(Vs1-Vf)R1/(R1+R2); the threshold voltage of the second switch Q2 satisfies: -(Vs1-Vf)R1/(R1+ R2)>Vth2>-(Vs1-Vf);
  • the node voltage of the source of the first switch Q1 is Va;
  • the node voltage of the source of the second switch Q2 is Vb;
  • the first switch Q1 and the The node voltage of the gate of the second switch Q2 is Vc.
  • Va Vs1 - Vf
  • Vc (Vs1 - Vf) R2 / (R1 + R2).
  • Vgs1 Vc - Va
  • Vgs1 - (Vs1 - Vf) R1/(R1 + R2). Since Vth1>-(Vs1-Vf)R1/(R1+R2), Vgs1 ⁇ Vth1 satisfies the ON condition of the first switch Q1, so the first switch Q1 is turned on.
  • Vb Vs1-Vf
  • Vgs2 Vc-Vb
  • the control method of the LED light string is individually performed by the switching module S of each LED component.
  • FIG. 2 is a circuit diagram of a preferred embodiment of the LED light string of the present invention.
  • the LED light string described above includes a plurality of LED assemblies L1, ..., Li, ..., Ln shown in Fig. 1 connected in series. Where n ⁇ 2, 1 ⁇ i ⁇ n.
  • Each LED component Li includes an input (not labeled), an output (not labeled), a primary LED 1, and a standby LED. 2 and a switching module S.
  • the input receives an input voltage Vsi.
  • the output then outputs a voltage Vs(i+1).
  • the turn-on voltage drop of 2 is Vf
  • the input voltage of the first LED component L1 is Vs1.
  • the input voltage Vsi Vs1-(i-1)Vf of the LED component Li
  • the input voltage Vs1 of the first LED component L1 satisfies the following condition: Vs1-(n*Vf)>0.
  • the resistance value of the first resistor 103 of each LED component Li is set to R1, and the resistance value of the second resistor 104 is R2.
  • the node voltage of the source of the first switch Q1 is Vai; the node voltage of the source of the second switch Q2 is Vbi; the node voltage of the gate of the first switch Q1 and the second switch Q2 is Vci.
  • the control method of the above LED string is as follows:
  • Vbi Vsi - Vf.
  • the LED component Li of the LED light string of the present invention comprises a main LED 1, a standby LED 2 and a switching module S.
  • the switching module S controls the standby LED 2 to be turned off; when the main LED 1 is blown, the switching module S controls the standby LED 2 to be turned on. Therefore, the LED light string using the LED component can continue to provide a stable light source when one of the main LEDs is blown, and has better durability, and relatively reduces maintenance frequency and cost.

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Description

LED组件及采用LED组件的LED灯串 技术领域
本发明是有关于一种LED组件，特别是有关于一种提供可靠光源的LED组件及采用所述LED组件的LED灯串。
 背景技术
目前背光模组的光源主要分为发光二极管(LED)及冷阴极荧光管(CCFL)。由于发光二极管具有低功耗的优势，因此以发光二极管取代冷阴极荧光管已是目前背光模组产业发展的主流趋势。
基于模组化的概念，不论是直下型或是侧入型的背光模组，皆采用以多个发光二极管串接成的灯串来做为其光源。由于背光模组必须提供稳定且均匀的面光源，一旦其中一颗发光二极管烧断，就必须立刻进行更换以维持面光源的均匀性。因此，背光模组灯串的维修频率或耐用度势必受制于每一发光二极管的工作寿命。
故，有必要提供一种LED组件及采用LED组件的LED灯串，以解决现有技术所存在的问题。
 技术问题
本发明提供一种LED组件及采用LED组件的LED灯串，以解决背光模组灯串耐用度不足的问题。
 技术解决方案
一种LED组件，其特征在于：所述LED组件包括一输入端、一输出端、一主用LED、一备用LED和一切换模组，所述切换模组在主用LED导通时，控制备用LED截止；在主用LED烧断时，控制备用LED导通；所述切换模组包括一第一场效应管、一第二场效应管、一第一电阻和一第二电阻，所述第一场效应管的源极连接所述主用LED的阴极并依序经由第一电阻和第二电阻接地，漏极连接所述输出端，栅极经由所述第二电阻接地；所述第二场效应管的源极连接所述备用LED的阴极，漏极连接所述输出端，栅极连接所述第一开关的栅极，所述第一场效应管的阈值电压Vth1和第二场效应管的阈值电压Vth2满足如下条件：Vth1＞-(Vs1-Vf)R1/(R1+R2)＞Vth2＞-(Vs1-Vf)，其中，Vs1为所述输入端的输入电压，Vf为主用LED及备用LED的导通压降，R1为第一电阻的电阻值，R2为第二电阻的电阻值。
一种LED组件，包含一输入端、一输出端、一主用LED、一备用LED和一切换模组，所述主用LED的阳极连接所述输入端，阴极经由所述切换模组连接到输出端，所述备用LED的阳极连接所述输入端，阴极经由所述切换模组连接到输出端，所述切换模组在主用LED导通时，控制备用LED截止；在主用LED烧断时，控制备用LED导通。
在本发明的一实施例中，所述切换模组包括一第一开关和一第二开关，所述第一开关连接所述主用LED的阴极与所述输出端，所述第二开关连接所述备用LED的阴极与所述输出端，当主用LED导通时，第一开关导通，第二开关断开；当主用LED烧断时，第一开关断开，第二开关导通。
在本发明的一实施例中，所述切换模组进一步包括一第一电阻和一第二电阻，所述主用LED的阴极依序经由所述第一电阻和第二电阻接地。
在本发明的一实施例中，所述切换模组包括一第一场效应管、一第二场效应管、一第一电阻和一第二电阻，所述第一场效应管的源极连接所述主用LED的阴极并依序经由第一电阻和第二电阻接地，漏极连接所述输出端，栅极经由所述第二电阻接地；所述第二场效应管的源极连接所述备用LED的阴极，漏极连接所述输出端，栅极连接所述第一开关的栅极。
在本发明的一实施例中，所述第一、第二场效应管均为P沟道金属氧化物半导体场效应管。
在本发明的一实施例中，所述第一场效应管的阈值电压Vth1和第二场效应管的阈值电压Vth2满足如下条件：Vth1＞-(Vs1-Vf)R1/(R1+R2)＞Vth2＞-(Vs1-Vf)，其中，Vs1为所述输入端的输入电压，Vf为主用LED及备用LED的导通压降，R1为第一电阻的电阻值，R2为第二电阻的电阻值。
一种LED灯串，包括多个串联的LED组件，每一LED组件包括一输入端、一输出端、一主用LED、一备用LED和一切换模组，所述主用LED的阳极连接所述输入端，阴极经由所述切换模组连接到输出端，所述备用LED的阳极连接所述输入端，阴极经由所述切换模组连接到输出端，所述切换模组在主用LED导通时，控制备用LED截止；在主用LED烧断时，控制备用LED导通。
在本发明的一实施例中，所述切换模组包括一第一开关和一第二开关，所述第一开关连接所述主用LED的阴极与所述输出端，所述第二开关连接所述备用LED的阴极与所述输出端，当主用LED导通时，第一开关导通，第二开关断开；当主用LED烧断时，第一开关断开，第二开关导通。
在本发明的一实施例中，所述切换模组进一步包括一第一电阻和一第二电阻，所述主用LED的阴极依序经由所述第一电阻和第二电阻接地。
在本发明的一实施例中，所述切换模组包括一第一场效应管、一第二场效应管、一第一电阻和一第二电阻，所述第一场效应管的源极连接所述主用LED的阴极并依序经由第一电阻和第二电阻接地，漏极连接所述输出端，栅极经由所述第二电阻接地；所述第二场效应管的源极连接所述备用LED的阴极，漏极连接所述输出端，栅极连接所述第一开关的栅极。
在本发明的一实施例中，所述第一、第二场效应管均为P沟道金属氧化物半导体场效应管。
在本发明的一实施例中，所述多个LED组件依次为L1、L2、……Li，……，Ln，其中，n≥2，1≤i≤n，每一LED组件Li的第一场效应管的阈值电压Vth1和第二场效应管的阈值电压Vth2满足如下条件：Vth1＞-(Vs1-i*Vf)R1/(R1+R2)>VTh2>-(Vs1-i*Vf)，其中，Vs1为所述输入端的输入电压，Vf为主用LED及备用LED的导通压降，R1为第一电阻的电阻值，R2为第二电阻的电阻值，Vs1-(n*Vf)＞0。
相较于现有技术，本发明的LED组件包括主用LED、备用LED和切换模组，当主用LED导通时，所述切换模组控制备用LED截止；直到所述主用LED烧断时，控制备用LED导通。因此，采用此LED组件的LED灯串在其中一颗主用LED烧断时，仍可持续提供稳定的光源，而具有较佳的耐用度。
 有益效果
本发明的LED组件包括主用LED、备用LED和切换模组，当主用LED导通时，所述切换模组控制备用LED截止；直到所述主用LED烧断时，控制备用LED导通。因此，采用此LED组件的LED灯串在其中一颗主用LED烧断时，仍可持续提供稳定的光源，，而具有较佳的耐用度。
 附图说明
图1是本发明LED组件一较佳实施例的电路图。
图2是本发明LED灯串一较佳实施例的电路图。
 本发明的最佳实施方式
为让本发明上述目的、特征及优点更明显易懂，下文特举本发明较佳实施例，并配合附图，作详细说明如下。再者，本发明所提到的方向用语，例如「上」、「下」、「前」、「后」、「左」、「右」、「内」、「外」、「侧面」等，仅是参考附加图式的方向。因此，使用的方向用语是用以说明及理解本发明，而非用以限制本发明。
请参考图1所示，图1是本发明LED组件一较佳实施例的电路图。所述LED组件L包含一输入端(未标号)、一输出端(未标号)、一主用LED 1、一备用LED 2以及一切换模组S。所述输入端接收一输入电压Vs1。所述输出端输出一电压Vs2。
所述主用LED 1的阳极与所述备用LED 2的阳极共同连接所述输入端。所述主用LED 1与所述备用LED 2的导通压降为Vf。
所述切换模组S连接所述主用LED 1的阴极及备用LED 2的阴极，并于主用LED 1导通时，控制备用LED 2截止；于主用LED 1烧断时，控制备用LED 2导通点亮。更详细地，所述切换模组S包含一第一开关Q1与一第二开关Q2，所述第一开关Q1连接所述主用LED 1的阴极与所述输出端。于所述主用LED 1导通点亮时，所述第一开关Q1维持导通。而当所述主用LED 1烧断时，所述第一开关Q1则因回路中断而断开。所述第二开关Q2连接所述备用LED 2的阴极与所述输出端，于所述主用LED1烧断时导通，使所述备用LED 2导通点亮。
本实施例中，所述切换模组S进一步包括一第一电阻R1和一第二电阻R2。所述第一开关Q1是一第一场效应管，优选为P沟道金属氧化物半导体场效应管(MOSFET)，其阈值电压为Vth1。其中所述第一开关Q1的源极连接所述主用LED 1的阴极，也依序经由所述第一电阻103和所述第二电阻104接地；所述第一开关Q1的漏极连接所述输出端；所述第一开关Q1的栅极则经由上述第二电阻104接地。所述第二开关Q2是一第二场效应管，优选为P沟道金属氧化物半导体场效应管(MOSFET)，其阈值电压为Vth2。所述第二开关Q2的源极连接所述备用LED 2的阴极；所述第二开关Q2的漏极连接所述输出端；所述第二开关Q2的栅极连接所述第一开关Q1的栅极。
设定所述第一电阻103的电阻值为R1，而第二电阻104的电阻值为R2。所述第一开关Q1的阈值电压Vth1满足：Vth1＞-(Vs1-Vf)R1/(R1+R2)；所述第二开关Q2的阈值电压满足：-(Vs1-Vf)R1/(R1+R2)＞Vth2＞-(Vs1-Vf)；所述第一开关Q1的源极的节点电压为Va；所述第二开关Q2的源极的节点电压为Vb；所述第一开关Q1与所述第二开关Q2的栅极的节点电压为Vc。
本实施例的LED组件L的控制原理说明如下：
当主用LED 1正常工作时，Va=Vs1-Vf，Vc=(Vs1-Vf)R2/(R1+R2)。又所述第一开关Q1的栅极与源极之间的电压差Vgs1=Vc-Va，因此，Vgs1=-(Vs1-Vf)R1/(R1+R2)。由于Vth1＞-(Vs1-Vf)R1/(R1+R2)，因此Vgs1＜Vth1，满足所述第一开关Q1的导通条件，故第一开关Q1导通。
此时，假设备用LED2也导通，则Vb=Vs1-Vf，所述第二开关Q2的栅极与源极之间的电压差Vgs2=Vc-Vb，因此，Vgs2=-(Vs1-Vf)R1/(R1+R2)。由于Vth2＜-(Vs1-Vf)R1/(R1+R2)，因此，Vgs2＞Vth2，不满足所述第二开关Q2的导通条件，故假设不成立，备用LED2此时截止。
当主用LED 1烧断时，Vc=0，所述第一开关Q1的Vgs1=0，故所述第一开关Q1是断开的。此时，假设备用LED 2导通而正常工作，则Vb=Vs1-Vf，所述第二开关Q2的栅极与源极之间的电压差Vgs2=Vc-Vb=-(Vs1-Vf)。由Vth2＞-(Vs1-Vf)可知，Vgs2＜Vth2，满足所述第二开关Q2的导通条件，故备用LED 2导通。
当多个所述LED组件L应用于组成LED灯串时，所述LED灯串的控制方法即是由各个LED组件的切换模组S个别执行。
进一步参考图2，图2是本发明LED灯串一较佳实施方式的电路图。上述LED灯串包括多个串联的图1所示的LED组件L1、……、Li、……、Ln。其中，n≥2，1≤i≤n。
每一个LED组件Li包括一输入端(未标号)、一输出端(未标号)、一主用LED 1、一备用LED 2以及一切换模组S。所述输入端接收一输入电压Vsi。所述输出端则输出一电压Vs(i+1)。
设定每一LED组件Li的主用LED 1和备用LED 2的导通压降均为Vf，第一个LED组件L1的输入电压为Vs1。所述LED组件Li的输入电压Vsi=Vs1-(i-1)Vf，第一个LED组件L1的输入电压Vs1满足如下条件：Vs1-(n*Vf)＞0。设定每一LED组件Li的第一电阻103的电阻值为R1，第二电阻104的电阻值为R2。
设定每个LED组件Li的第一开关Q1的阈值电压Vth1满足如下条件：Vth1＞-(Vsi-Vf)R1/(R1+R2)=-(Vs1-i*Vf)R1/(R1+R2)。设定每个LED组件Li的第二开关Q2的阈值电压Vth2满足如下条件：-(Vs1-i*Vf)= -(Vsi-Vf)<VTh2<-(Vs1-i*Vf)R1/(R1+R2)。所述第一开关Q1的源极的节点电压为Vai；所述第二开关Q2的源极的节点电压为Vbi；所述第一开关Q1与所述第二开关Q2的栅极的节点电压为Vci。
上述LED灯串的控制方法如下：
对每个LED组件Li而言，当主用LED 1正常工作时，Vai=Vsi-Vf，Vci=(Vsi-Vf)R2/(R1+R2)，所述第一开关Q1的栅极与源极之间的电压差Vgs1=Vci-Vai=-(Vsi-Vf)R1/(R1+R2)。由于Vth1＞-(Vsi-Vf)R1/(R1+R2)，因此Vgs1＜Vth1，满足所述第一开关Q1的导通条件，故第一开关Q1导通。
此时，假设所述备用LED2也导通，Vbi=Vsi-Vf。又所述第二开关Q2的栅极与源极之间的电压差Vgs2=Vci-Vbi，故Vgs2= -(Vsi-Vf)R1/(R1+R2)=-(Vs1-i*Vf)R1/(R1+R2)。由于Vth2＜-(Vsi-Vf)R1/(R1+R2)，因此，Vgs2＞Vth2，不满足所述第二开关Q2的导通条件，故假设不成立，备用LED 2此时截止。
当主用LED 1烧断时，Vci=0，所述第一开关Q1的Vgs1=0，故所述第一开关Q1是断开的。此时，假设备用LED 2导通而正常工作，则Vbi=Vsi-Vf，所述第二开关Q2的栅极与源极之间的电压差Vgs2=Vci-Vbi=-(Vsi-Vf)。由Vth2＞-(Vsi-Vf)可知，Vgs2＜Vth2，满足所述第二开关Q2的导通条件，故此时所述备用LED 2呈导通状态。
相较于现有技术，本发明LED灯串的LED组件Li包括主用LED1、备用LED2以及切换模组S。当主用LED1正常工作时，所述切换模组S控制备用LED2截止；当主用LED1烧断时，所述切换模组S控制备用LED2导通。因此，采用此LED组件的LED灯串在其中一颗主用LED烧断时，仍可持续提供稳定的光源，而具有较佳的耐用度，相对减少维修频率与成本。
本发明已由上述相关实施例加以描述，然而上述实施例仅为实施本发明的范例。必需指出的是，已公开的实施例并未限制本发明的范围。相反地，包含于权利要求书的精神及范围的修改及均等设置均包括于本发明的范围内。
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Claims (13)

  1. 一种LED组件，其特征在于：所述LED组件包括一输入端、一输出端、一主用LED、一备用LED和一切换模组，所述切换模组在主用LED导通时，控制备用LED截止；在主用LED烧断时，控制备用LED导通；所述切换模组包括一第一场效应管、一第二场效应管、一第一电阻和一第二电阻，所述第一场效应管的源极连接所述主用LED的阴极并依序经由第一电阻和第二电阻接地，漏极连接所述输出端，栅极经由所述第二电阻接地；所述第二场效应管的源极连接所述备用LED的阴极，漏极连接所述输出端，栅极连接所述第一开关的栅极，所述第一场效应管的阈值电压Vth1和第二场效应管的阈值电压Vth2满足如下条件：Vth1＞-(Vs1-Vf)R1/(R1+R2)＞Vth2＞-(Vs1-Vf)，其中，Vs1为所述输入端的输入电压，Vf为主用LED及备用LED的导通压降，R1为第一电阻的电阻值，R2为第二电阻的电阻值。
  2. 一种LED组件，其特征在于：所述LED组件包括一输入端、一输出端、一主用LED、一备用LED和一切换模组，所述主用LED的阳极连接所述输入端，阴极经由所述切换模组连接到输出端，所述备用LED的阳极连接所述输入端，阴极经由所述切换模组连接到输出端，所述切换模组在主用LED导通时，控制备用LED截止；在主用LED烧断时，控制备用LED导通。
  3. 如权利要求2所述的LED组件，其特征在于：所述切换模组包括一第一开关和一第二开关，所述第一开关连接所述主用LED的阴极与所述输出端，所述第二开关连接所述备用LED的阴极与所述输出端，当主用LED导通时，第一开关导通，第二开关断开；当主用LED烧断时，第一开关断开，第二开关导通。
  4. 如权利要求3所述的LED组件，其特征在于：所述切换模组进一步包括一第一电阻和一第二电阻，所述主用LED的阴极依序经由所述第一电阻和第二电阻接地。
  5. 如权利要求2所述的LED组件，其特征在于：所述切换模组包括一第一场效应管、一第二场效应管、一第一电阻和一第二电阻，所述第一场效应管的源极连接所述主用LED的阴极并依序经由第一电阻和第二电阻接地，漏极连接所述输出端，栅极经由所述第二电阻接地；所述第二场效应管的源极连接所述备用LED的阴极，漏极连接所述输出端，栅极连接所述第一开关的栅极。
  6. 如权利要求5所述的LED组件，其特征在于：所述第一、第二场效应管均为P沟道金属氧化物半导体场效应管。
  7. 如权利要求6所述的LED组件，其特征在于：所述第一场效应管的阈值电压Vth1和第二场效应管的阈值电压Vth2满足如下条件：Vth1＞-(Vs1-Vf)R1/(R1+R2)＞Vth2＞-(Vs1-Vf)，其中，Vs1为所述输入端的输入电压，Vf为主用LED及备用LED的导通压降，R1为第一电阻的电阻值，R2为第二电阻的电阻值。
  8. 一种LED灯串，其特征在于：所述LED灯串包括多个串联的LED组件，每一LED组件包括一输入端、一输出端、一主用LED、一备用LED和一切换模组，所述主用LED的阳极连接所述输入端，阴极经由所述切换模组连接到输出端，所述备用LED的阳极连接所述输入端，阴极经由所述切换模组连接到输出端，所述切换模组在主用LED导通时，控制备用LED截止；在主用LED烧断时，控制备用LED导通。
  9. 如权利要求8所述的LED灯串，其特征在于：所述切换模组包括一第一开关和一第二开关，所述第一开关连接所述主用LED的阴极与所述输出端，所述第二开关连接所述备用LED的阴极与所述输出端，当主用LED导通时，第一开关导通，第二开关断开；当主用LED烧断时，第一开关断开，第二开关导通。
  10. 如权利要求9所述的LED灯串，其特征在于：所述切换模组进一步包括一第一电阻和一第二电阻，所述主用LED的阴极依序经由所述第一电阻和第二电阻接地。
  11. 如权利要求8所述的LED灯串，其特征在于：所述切换模组包括一第一场效应管、一第二场效应管、一第一电阻和一第二电阻，所述第一场效应管的源极连接所述主用LED的阴极并依序经由第一电阻和第二电阻接地，漏极连接所述输出端，栅极经由所述第二电阻接地；所述第二场效应管的源极连接所述备用LED的阴极，漏极连接所述输出端，栅极连接所述第一开关的栅极。
  12. 如权利要求11所述的LED灯串，其特征在于：所述第一、第二场效应管均为P沟道金属氧化物半导体场效应管。
  13. 如权利要求12所述的LED灯串，其特征在于：所述多个LED组件依次为L1、L2、……Li，……，Ln，其中，n≥2，1≤i≤n，每一LED组件Li的第一场效应管的阈值电压Vth1和第二场效应管的阈值电压Vth2满足如下条件：Vth1＞-(Vs1-i*Vf)R1/(R1+R2)>VTh2>-(Vs1-i*Vf)，其中，Vs1为所述输入端的输入电压，Vf为主用LED及备用LED的导通压降，R1为第一电阻的电阻值，R2为第二电阻的电阻值，Vs1-(n*Vf)＞0。
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CN201715366U (zh) * 2010-03-26 2011-01-19 秦皇岛国安电力电子技术有限公司 一种电梯专用照明灯
CN201636622U (zh) * 2010-04-06 2010-11-17 吴全华 数字式可控光交流直驱集成led照明灯

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DE112011105147T5 (de) 2014-01-09
US8669710B2 (en) 2014-03-11
CN102252226B (zh) 2013-01-09
CN102252226A (zh) 2011-11-23
DE112011105147B4 (de) 2019-03-28
US20120274212A1 (en) 2012-11-01

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