WO2015013960A1 - 一种 led 保护装置 - Google Patents

一种 led 保护装置 Download PDF

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Publication number
WO2015013960A1
WO2015013960A1 PCT/CN2013/080644 CN2013080644W WO2015013960A1 WO 2015013960 A1 WO2015013960 A1 WO 2015013960A1 CN 2013080644 W CN2013080644 W CN 2013080644W WO 2015013960 A1 WO2015013960 A1 WO 2015013960A1
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WIPO (PCT)
Prior art keywords
led
current
operational amplifier
power supply
protection device
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PCT/CN2013/080644
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English (en)
French (fr)
Inventor
杨子明
鲁建
赖东强
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深圳市日上光电股份有限公司
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Publication of WO2015013960A1 publication Critical patent/WO2015013960A1/zh

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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]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
    • H05B45/56—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits involving measures to prevent abnormal temperature of the LEDs
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Definitions

  • the present invention relates to the field of LED lighting technology, and in particular to an LED protection device for avoiding over-current and over-temperature of a circuit.
  • the lamp has the characteristics of high light conversion efficiency, low energy consumption, small size and long life. It is gradually used in various lighting fields, especially in advertising signs such as letter lights, signs, advertising light boxes. Such occasions are widely used.
  • the long life of LED lamps is based on a safe working environment. When LEDs are exposed to electrical shock or overheating damage, LED lamps will fail and affect their service life. Over-current shock, that is, the current applied to the LED exceeds the Maximum rated current on the LED technical data sheet, including over-current surges due to overcurrent and overvoltage. Overheat damage refers to the failure of components in an LED luminaire in the event of overheating, usually in LEDs.
  • LED lighting design nearly 80% of the energy is converted into heat, and LED The performance and lifetime are closely related to its operating temperature. Usually, when the temperature inside the LED chip rises by 10 degrees, the luminous flux is attenuated by 1% and the lifetime of the LED is reduced by 50%. So in the LED In lighting design, it is necessary to ensure that the LED lamp circuit is designed with over-current protection or overheat protection circuits or devices.
  • the LED protection device In the design of the LED protection device, usually only the LED power supply is directly connected to multiple LED lights in series, and in the LED A protection circuit is provided in the power circuit, and when the circuit is abnormal, the protection point of the power circuit is activated to start protection.
  • Such a circuit design is short in the LED power supply line, ie load LED When the number of lamps is small, it can play a very good protection role.
  • the external load line of the LED power supply is long, that is, when multiple LED lights are connected, the short circuit power does not reach the LED.
  • the protection point of the power circuit cannot protect itself, causing the LED lamp circuit to overheat and burn under continuous high current.
  • the output power of the LED power supply is LED
  • the power of the lamp is not matched, it is more difficult to touch the protection point of the LED power circuit during overcurrent.
  • the 200W power supply overcurrent protection point reaches 300W or higher, the load power of the lamp is only 100W. Even less, because the wiring is too long, it is difficult to achieve automatic protection of the power protection point. In the long-term overcurrent, the component may overheat and even cause fire, which may cause a safety hazard.
  • the technical problem to be solved by the present invention lies in the LEDs present in the related LED lighting technology. If the external load line of the power supply is too long, it will not touch the protection point of the LED power circuit and damage the entire LED lighting circuit, which will affect the LED. Insufficient lamp life provides an LED protection device to avoid over- or over-temperature of the LED circuit.
  • an LED protection device for accessing LED power supply and LED Between the light groups including:
  • a current detecting unit is connected in series between the LED power source and the LED lamp group to detect an energizing current between the LED power source and the LED lamp group;
  • a switch control unit is connected in series between the LED power source and the LED lamp group to control on and off between the LED power source and the LED lamp group;
  • control unit respectively connected to the current detecting unit and the switch control unit, configured to control the switch control unit according to an energization current detected by the current detecting unit
  • the LED lamp group is turned on and off with the LED power source.
  • the control unit includes a self-locking unlocking component for self-locking and unlocking the circuit and a driving control component for driving the switch control unit;
  • the drive control component is connected to the current detecting unit and the switch control unit, and receives an energization current detected by the current detecting unit, and controls the driving control component to drive the current when the energizing current exceeds a protection point.
  • the switch control unit disconnects the power supply of the LED power supply and the LED light group;
  • the self-locking unlocking component is connected to the current detecting unit and the driving control component, and receives an energizing current detected by the current detecting unit, and controls the driving control component when the energizing current does not exceed a protection point.
  • the switch control unit is driven to restore power supply of the LED power source and the LED light group.
  • the current detecting unit includes A current detecting resistor, a polymer positive temperature thermistor or an overcurrent identifying circuit for detecting a passing current between the LED power source and the LED lamp group is connected.
  • the switch control unit is a MOS tube.
  • the LED protection device further includes a housing electrically connected to the LED power source and the LED lamp group via wires, respectively.
  • the LED protection device housing is provided with heat dissipation fins.
  • the LED protection device includes a resistor R1 for detecting an energizing current, a switching transistor Q1 for controlling a circuit to be turned on, an operational amplifier U1, an operational amplifier U2, a diode D1, and a diode D2;
  • the input terminal 3 is used for positive feedback of the current to achieve the purpose of self-locking and unlocking;
  • the output terminal 1 of the operational amplifier U1 is connected to the inverting input terminal 6 of the operational amplifier U2 through the diode D1, and the non-inverting input terminal 5 of the operational amplifier U2 is connected to the LED power supply.
  • the positive terminal, the output end of the operational amplifier U2 is electrically connected to the switch tube Q1 for controlling the on and off of the switch tube Q1.
  • the LED protection device further includes current limiting resistors R8, R9, R2, R7;
  • the current flows from the positive pole of the LED power source through the current limiting resistor R8 and the current limiting resistor R9 to the inverting input terminal 2 of the operational amplifier U1; the negative pole of the LED power supply is connected to the resistor R1 and the current limiting resistor R2 to the non-inverting input terminal 3 of the operational amplifier U1; The anode of the LED power supply is connected to the non-inverting input terminal 5 of the operational amplifier U2 through a current limiting resistor R8 and a current limiting resistor R7.
  • the present invention has the following advantages: the LED protection device provided by the present invention is used for connecting LED power supply and LED Between the lamp groups, when the over-current occurs in the circuit, the circuit can be controlled to be turned on and off without the need to reach the protection point of the LED power circuit to start the circuit protection, and the protection can be provided in time to avoid causing the lighting device to overheat and ignite. Make the entire LED circuit safer.
  • Figure 1 is a schematic view of the structure of the present invention.
  • 2 is a circuit diagram of an LED protection device of the present invention.
  • the invention discloses an LED protection device 3, which can be connected to an LED power source 1 and an LED formed by connecting several LED lamps in series. Between the lamp group 2, when the LED circuit is over-current or overheated due to excessive load line or other external environmental reasons, the current output can be stopped and locked in time, and the circuit can be restored after the fault is eliminated, thereby realizing the LED The purpose of circuit protection.
  • the LED protection device 3 includes: Connecting the current detecting unit 3a between the LED power source 1 and the LED lamp group 2 for detecting the energizing current thereof; connecting the LED power source 1 and the LED lamp group 2 in series to control the on and off of the energizing circuit
  • the switch control unit 3d ; the control unit respectively connected to the current detecting unit 3a and the switch control unit 3d, for the energizing current detected by the current detecting unit 3a, to control the switch control unit 3d to control LED
  • the lamp group 2 is turned on and off with the LED power source 1.
  • the control unit includes a self-locking unlocking assembly 3b for self-locking and unlocking the circuit and a drive control assembly 3c for driving the switch control unit 3d.
  • the drive control unit 3c is connected to the current detecting unit 3a and the switch control unit 3d, and receives the energization current detected by the current detecting unit 3a. When the energizing current exceeds the protection point of the power circuit, the drive control unit 3c is controlled to drive the switch control unit 3d. Turn on the power supply of LED power supply 1 and LED light group 2.
  • the self-locking unlocking component 3b is connected to the current detecting unit 3a and the driving control component 3c, and receives the energizing current detected by the current detecting unit 3a. When the energizing current does not exceed the protection point of the power circuit, the driving control component 3c is controlled to drive the switch control unit.
  • the switch control unit 3d in this scheme selects the MOS tube because it has good temperature characteristics and is not susceptible to temperature changes in the circuit environment.
  • the current detecting unit 3a may be a current detecting resistor, a polymer positive temperature thermistor or an overcurrent identifying circuit.
  • the protection device 3 can include a casing for the electronic circuit to be disposed therein and connected between the LED power source and the LED lamp group 2 by wires to function as an overcurrent protection.
  • the heat-dissipating fins are arranged on the outer casing of the protection device 3 to reduce the temperature of the protection device 3, to prevent the temperature from being too high to initiate protection, and to affect the normal operation of the circuit between the LED power source 1 and the LED lamp group 2.
  • the current detecting unit 3a connected between the LED power source 1 and the LED lamp group 2 for detecting the passing current is a current detecting resistor
  • the drive control component 3c receives the current detected by the current detecting unit 3a beyond the protection point of the power circuit, the drive control component 3c outputs a low potential, and the MOS transistor is turned off at a low potential.
  • the circuit between the LED power supply and the LED lamp group 2 is turned on, so as to avoid the phenomenon that the circuit is overheated and the lighting device is ignited due to continuous high current impact.
  • the over-current identification circuit can also be selected as the current detecting unit 3a.
  • the over-current identification circuit is selected as the current detecting unit 3a of the protection device, the working principle is the same as the current detecting resistor, and the direct detecting by the over-current identification circuit is mainly used. Abnormal current in the circuit.
  • the current detecting unit 3a connected between the LED power source 1 and the LED lamp group 2 is a polymer positive temperature thermistor
  • the control driving control component 3c outputs a high potential to the MOS transistor to make the MOS transistor at a high potential.
  • the drive control component 3c receives the current.
  • the energization current detected by the detecting unit 3a exceeds the protection point of the power supply circuit, the driving control component 3c outputs a low potential, and the MOS transistor is turned off at a low potential, and the circuit between the LED power source 1 and the LED lamp group 2 is turned off, thereby Avoid continuous high current surges that cause the circuit to overheat and be damaged.
  • the polymer positive temperature thermistor When the overcurrent or high temperature state in the circuit is removed, the polymer positive temperature thermistor returns to normal; the polymer positive temperature thermistor is small in size, low in cost, and has obvious reaction to temperature changes in the environment, which is beneficial to avoid overheating in the circuit. Damage and damage the circuit.
  • FIG. 2 discloses a circuit diagram of one embodiment of an LED protection device of the present invention.
  • the circuit diagram of the LED protection device 3 mainly includes a resistor R1 for detecting an energizing current, a switching transistor Q1 for controlling the switching of the control circuit, an operational amplifier U1, an operational amplifier U2, a diode D1, a diode D2, and a current limiting resistor R8, R9, R2, and R7.
  • Etc. can also include some auxiliary circuit devices, such as capacitors C1-C4, resistors R3-R6, diodes D3, and so on.
  • the LED protection device 3 can include a casing, and the circuit device can be disposed on a circuit board and installed in the casing, and then connected between the LED power source 1 and the LED lamp group 2 through a wire to serve The role of overcurrent protection.
  • the current flows from the positive pole of the LED power source 1 through the current limiting resistor R8 and the current limiting resistor R9 to the inverting input terminal 2 of the operational amplifier U1; the negative terminal of the LED power source 1 is connected to the resistor R1 and the current limiting resistor R2 to the non-inverting input terminal of the operational amplifier U1.
  • the output terminal 1 of the operational amplifier U1 is connected to the diode D2 to the non-inverting input terminal 3 of the operational amplifier U1 for positive current feedback to achieve the purpose of self-locking and unlocking; the output terminal 1 of the operational amplifier U1 is connected to the operational amplifier U2 through the diode D1.
  • the inverting input terminal 6, the anode of the LED power supply 1 is connected to the non-inverting input terminal 5 of the operational amplifier U2 through the current limiting resistor R8 and the current limiting resistor R7, and the output terminal of the operational amplifier U2 is electrically connected with the switching transistor Q1 for controlling the switching tube The continuity of Q1.
  • the resistor R1 When an abnormal current passes or is short-circuited in the circuit, the resistor R1 generates a detection voltage and is connected to the operational amplifier U1 through the current limiting resistor R2. At this time, the operational amplifier U1 operates on the voltage flowing into the inverting input terminal 2 and the non-inverting input terminal 3. The output voltage is amplified by the output terminal 1 and connected to the inverting input terminal 6 of the operational amplifier U2 through the diode D1. The output terminal 1 of the operational amplifier U1 is also connected to the non-inverting input terminal 3 of the operational amplifier U1 through the diode D2 to realize positive current feedback. It is used to limit the energizing current and realize the self-locking function.
  • the inverting input terminal 6 of the operational amplifier U2 receives the amplified detection voltage from the operational amplifier U1, and compares with the voltage of the non-inverting input terminal 5 connected to the positive pole of the LED power supply 1 through the resistor R7 and the resistor R8, and passes through the output terminal 7 to the switching transistor Q1.
  • the output low potential causes the switching transistor Q1 to be in an off state, so that the current branch is broken, thereby preventing the circuit from being damaged by overheating or even igniting due to continuous large current.
  • the resistor R1 When the circuit returns to normal, the resistor R1 does not generate the detection voltage, the output terminal 1 of the operational amplifier U1 does not output the amplified detection voltage to the arithmetic processor U2, and the arithmetic processor U2 inputs a high potential to the switch Q1 to drive its conduction, and restores the Current branch current path.
  • the arithmetic processor U1 When the arithmetic processor U1 does not output the amplified detection voltage, the diode D2 is unlocked.

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  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

一种LED保护装置（3），用于接入LED电源（1）与LED灯组（2）之间，包括电流检测单元（3a），串联接入LED电源（1）与LED灯组（2）之间，用于检测通电电流；开关控制单元（3d），串联接入LED电源（1）与LED灯组（2）之间，用以控制LED电源（1）与LED灯组（2）之间的通断；控制单元，分别与电流检测单元（3a）和开关控制单元（3d）相连，用于根据电流检测单元（3a）检测到的通电电流，来控制开关控制单元（3d）控制LED电源（1）与LED灯组（2）的通断。该LED保护装置（3）可直接接入LED电源（1）与LED灯组（2）之间，在电路中出现过电或短路时即可控制电路的通断而无需待其达到LED电源电路的保护点才启动电路保护，能够及时提供保护，避免引发照明设备过热起火现象，使得整个LED电路更加安全。

Description

一种 LED 保护装置 技术领域
本发明涉及 LED 照明技术领域，具体涉及用于避免电路过电与过温的一种 LED 保护装置。
背景技术
LED 灯作为新型绿色照明技术，具有光转换效率高、能耗低、体积小、寿命长的特点，逐渐被应用于各种照明领域，尤其是在广告标识灯，如字母灯、标志牌、广告灯箱等场合得到广泛应用。 LED 灯的寿命长是基于安全的工作环境，当 LED 在面临过电冲击或过热损伤时会导致 LED 灯失效，影响其使用寿命。过电冲击即在 LED 上施加的电流超过该 LED 技术数据手册上的最大额定电流，包括过电流和过电压引起的过电冲击。过热损伤是指 LED 灯具中的元器件在过热情况下导致失效，通常在 LED 灯遭遇过电冲击时也会使其中的元器件受到过热损伤，影响 LED 的工作寿命。在 LED 照明设计中，有接近 80% 的电能会转化为热能，而且 LED 的性能和寿命与其工作温度密切相关，通常当 LED 芯片内温度升高 10 度，其光通量就会衰减 1% ， LED 的寿命减少 50% 。因此，在 LED 照明设计中，必须保证 LED 灯电路中设计有过电保护或过热保护电路或装置。
在 LED 保护装置设计过程中，通常只 LED 电源直接串联接入多个 LED 灯，并在 LED 电源电路中设置保护电路，当电路出现异常即触动电源电路的保护点而启动保护。这样的电路设计在 LED 电源负载线短，即负载 LED 灯数量少时能起到很好防护作用，但在 LED 电源外接负载线长，即外接多个 LED 灯时会出现在电路短路时，短路的功率还没有达到 LED 电源电路的保护点而无法起保护作用，使 LED 灯电路在持续的大电流下产生过热而燃烧的情况。而且当 LED 电源的输出功率与 LED 灯的功率不匹配时，在过电流时更难触动 LED 电源电路的保护点，如在 200W 的电源过流保护点达到 300W 甚至更高时，灯的负载功率却只有 100W 甚至更少，由于接线太长，难以达到电源保护点无法进行自动保护，在长时间过电流容易引起元器件过热操作甚至导致起火，造成安全隐患。
发明内容
本发明要解决的技术问题在于针对相关 LED 照明技术中存在的由于 LED 电源外接负载线过长，导致其受到过电冲击或过热损伤时并不动触动 LED 电源电路的保护点而损毁整个 LED 照明电路，影响 LED 灯的使用寿命的不足，提供一种用于避免 LED 电路过电或过温的 LED 保护装置。
本发明解决其技术问题所采用的技术方案是： 一种LED保护装置， 用于接入 LED 电源与 LED 灯组之间，包括：
电流检测单元，串联接入在所述LED电源与LED灯组之间，用以检测所述LED电源与LED灯组之间的通电电流；
开关控制单元，串联接入在所述LED电源与LED灯组之间，用以控制所述LED电源与LED灯组之间的通断；
控制单元，分别与所述电流检测单元和所述开关控制单元相连，用于根据所述电流检测单元检测到的通电电流，来控制所述开关控制单元控制 所述LED灯组与所述LED电源的通断。
在本发明所述的LED保护装置中， 所述控制单元包括用于对电路实现自锁与解锁的自锁解锁组件和用于驱动开关控制单元的驱动控制组件；
所述驱动控制组件与所述电流检测单元和所述开关控制单元连接，接收所述电流检测单元检测到的通电电流，当所述通电电流超出保护点时，控制所述驱动控制组件来驱动所述开关控制单元断开所述LED电源与所述LED灯组的供电；
所述自锁解锁组件与所述电流检测单元和所述驱动控制组件连接，接收所述电流检测单元检测到的通电电流，当所述通电电流未超出保护点时，控制所述驱动控制组件来驱动所述开关控制单元恢复所述LED电源与所述LED灯组的供电。
在本发明所述的LED保护装置中， 所述的电流检测单元包括 连接在所述LED电源和LED灯组之间检测通过电流的 电流侦测电阻、高分子正温热敏电阻或过电流识别电路。
在本发明所述的LED保护装置中， 所述的开关控制单元为MOS管。
在本发明所述的LED保护装置中， 所述LED保护装置还包括外壳，分别通过导线与所述LED电源和LED灯组导电连接。
在本发明所述的LED保护装置中，所述LED保护装置外壳上设有散热鳍片。
在本发明所述的LED保护装置中， 所述LED保护装置包括用于检测通电电流的电阻R1、控制电路通断的开关管Q1、运算放大器U1、运算放大器U2、二极管D1和二极管D2；
电流从所述LED电源正极流入运算放大器U1的反相输入端2，LED电源负极连接电阻R1到运算放大器U1的同相输入端3，运算放大器U1的输出端1连接二极管D2到运算放大器U1的同相输入端3，用以实现电流正反馈，以达到自锁解锁目的；运算放大器U1的输出端1通过二极管D1连接运算放大器U2的反相输入端6，运算放大器U2的同相输入端5连接LED电源正极，运算放大器U2的输出端与开关管Q1电连接,用以控制开关管Q1的通断。
在本发明所述的LED保护装置中， 所述的LED保护装置还包括限流电阻R8、R9、R2、R7；
电流从所述LED电源正极流经限流电阻R8、限流电阻R9流入运算放大器U1的反相输入端2；LED电源负极连接电阻R1、限流电阻R2到运算放大器U1的同相输入端3；LED电源正极通过限流电阻R8、限流电阻R7连接到运算放大器U2的同相输入端5。
本发明与现有技术相比具有如下优点：本发明所提供的 LED 保护装置，用以接入 LED 电源与 LED 灯组之间，在电路中出现过电时即可控制电路的通断而无需待其达到 LED 电源电路的保护点才启动电路保护， 能够 及时提供保护，避免引发照明设备过热起火现象， 使得整个 LED 电路更加安全。
附图说明
下面将结合附图及实施例对本发明作进一步说明，附图中：
[根据细则91更正 22.09.2013]　
图 1 是本发明的结构示意图。
图2是本发明LED保护装置的电路图。
图中： 1 、LED电源；2、LED灯组；3、LED保护装置；3a、电流检测单元；3ｂ、自锁解锁组件；3c、驱动控制组件；3d、开关控制单元。
具体实施方式
为了对本发明的技术特征、目的和效果有更加清楚的理解，现对照附图详细说明本发明的具体实施方式。
本发明公开一种 LED 保护装置 3 ，可 接入 LED 电源 1 与由若干 LED 灯串联而成的 LED 灯组 2 之间，在 LED 电路因负载线过长或其他外部环境原因而出现过流或过热时能及时停止电流输出并锁定，故障消除后可恢复电路，从而实现对 LED 电路保护的目的。
该 LED 保护装置 3 包括： 串联接入在LED电源1与LED灯组2之间的用以检测其通电电流的电流检测单元3a；串联接入在LED电源1与LED灯组2之间的用以控制通电电路的通断的开关控制单元3d；分别与电流检测单元3a和开关控制单元3d相连的控制单元，用于电流检测单元3a检测到的通电电流，来控制开关控制单元3d控制 LED 灯组2与LED电源1的通断。控制单元包括用于对电路实现自锁与解锁的自锁解锁组件3b和用于驱动开关控制单元3d的驱动控制组件3c。驱动控制组件3c与电流检测单元3a和开关控制单元3d连接，接收电流检测单元3a检测到的通电电流，当通电电流超出电源电路的保护点时，控制驱动控制组件3c来驱动开关控制单元3d断开LED电源1与LED灯组2的供电。自锁解锁组件3b与电流检测单元3a和驱动控制组件3c连接，接收电流检测单元3a检测到的通电电流，当通电电流未超出电源电路的保护点时，控制驱动控制组件3c来驱动开关控制单元3d恢复LED电源1与LED灯组2的供电。该方案中的开关控制单元3d选择MOS管，是由于其温度特性好，不易受电路环境中的温度变化的影响。其中的电流检测单元3a可以为电流侦测电阻、高分子正温热敏电阻或过电流识别电路。
可以理解的，该保护装置3可以包括一个外壳，以供电子电路设置于其中，并通过导线连接在LED电源与LED灯组2之间，以起到过流保护的作用。保护装置3的外壳上设有散热鳍片，用以降低保护装置3的温度，避免因温度过高而启动保护，影响LED电源1与LED灯组2之间电路正常工作。
当连接在LED电源1与LED灯组2之间用于检测通过电流的电流检测单元3a为电流侦测电阻时，当电路中有异常电流通过或短路时，电流侦测电阻的电压升高，说明该LED电源的负载过高，驱动控制组件3c接收电流检测单元3a检测到的通电电流超出电源电路的保护点，驱动控制组件3c输出一个低电位，MOS管在低电位时处于截止状态，断开LED电源与LED灯组2之间的电路，从而避免持续大电流冲击导致电路过热而引起照明设备起火现象。当电路故障消除且通电电流正常时，电流侦测电阻的电压正常，自锁解锁组件3b接收电流检测单元3a检测到的通电电流未超出电源电路的保护点时，控制驱动控制组件3c给MOS管输出一个高电位，来驱动开关控制单元3d恢复LED电源1与LED灯组2的供电,使LED灯组2正常使用；电流侦测电阻对电路中电流变化反映灵敏，有利于避免电路中出现过电冲击而损毁电路。方案中还可以选择过电识别电路作为其电流检测单元3a，选择过电识别电路作为该保护装置的电流检测单元3a时，其工作原理与电流侦测电阻一样，主要利用过电识别电路直接检测电路中电流异常情况。
当 连接在LED电源1与LED灯组2之间的电流检测单元3a为高分子正温热敏电阻时，在电路正常工作电流通过或电路中各元器件处于正常环境温度时，高分子正温热敏电阻处于低阻状态，自锁解锁组件3b接收电流检测单元3a检测到的通电电流未超出电源电路的保护点时，控制驱动控制组件3c给MOS管输出一个高电位，使MOS管在高电位时下处于导通状态，LED灯组2正常工作。当电路中有异常电流或环境温度升高时，大电流或环境升高所产生的热量使该高分子正温热敏电阻迅速膨胀，处于高阻状态，电压升高，驱动控制组件3c接收电流检测单元3a检测到的通电电流超出电源电路的保护点，驱动控制组件3c输出一个低电位，MOS管在低电位时处于截止状态，断开LED电源1与LED灯组2之间的电路，从而避免持续大电流冲击导致电路过热而损毁。当电路中过电流或高温状态排除后，高分子正温热敏电阻恢复正常；高分子正温热敏电阻体积小、成本低、而且对于环境中温度变化反应明显，有利于避免电路中出现过热损伤而损毁电路。
图2公开了本发明LED保护装置的一个具体实施方式的电路图。LED保护装置3的电路图主要包括用于检测通电电流的电阻R1、控制电路通断的开关管Q1、运算放大器U1、运算放大器U2、二极管D1、二极管D2和限流电阻R8、R9、R2、R7等；当然，还可以包括一些辅助电路器件，如电容C1-C4、电阻R3-R6、二极管D3等。可以理解的，该LED保护装置3可以包括一个外壳，上述电路器件可以设置在一电路板上，并安装在该外壳中，再通过导线连接LED电源1和LED灯组2之间，以起到过流保护的作用。
电流从所述LED电源1正极流经限流电阻R8、限流电阻R9流入运算放大器U1的反相输入端2；LED电源1负极连接电阻R1、限流电阻R2到运算放大器U1的同相输入端3；运算放大器U1的输出端1连接二极管D2到运算放大器U1的同相输入端3，用以实现电流正反馈，以达到自锁解锁目的；运算放大器U1的输出端1通过二极管D1连接运算放大器U2的反相输入端6，LED电源1正极通过限流电阻R8、限流电阻R7连接到运算放大器U2的同相输入端5，运算放大器U2的输出端与开关管Q1电连接,用以控制开关管Q1的通断。
当电路中有异常电流通过或短路时，电阻R1产生检测电压并通过限流电阻R2接入运算放大器U1中，此时运算放大器U1对流入反相输入端2与同相输入端3的电压进行运算，通过输出端1放大检测电压并通过二极管D1连接运算放大器U2的反相输入端6，运算放大器U1的输出端1还通过二极管D2连接到运算放大器U1的同相输入端3，实现电流正反馈，用于对通电电流进行限制，实现自锁功能。运算放大器U2的反相输入端6接收来自运算放大器U1的放大检测电压，与通过电阻R7、电阻R8连接LED电源1正极的同相输入端5的电压进行比对，通过输出端7向开关管Q1输出低电位，使开关管Q1处于截止状态，使该电流支路断路，从而避免电路中通过持续大电流导致过热甚至起火而损毁电路。当电路恢复正常时，电阻R1没有产生检测电压，运算放大器U1的输出端1并没有向运算处理器U2输出放大检测电压，运算处理器U2向开关管Q1输入高电位驱动其导通，恢复该电流支路电流通路。当运算处理器U1没有输出放大检测电压时，二极管D2实现解锁。
本发明是通过几个具体实施例进行说明的，本领域技术人员应当明白，在不脱离本发明范围的情况下，还可以对本发明进行各种变换和等同替代。另外，针对特定情形或具体情况，可以对本发明做各种修改，而不脱离本发明的范围。因此，本发明不局限于所公开的具体实施例，而应当包括落入本发明权利要求范围内的全部实施方式。

Claims (8)

  1. 一种 LED 保护装置，用于接入 LED 电源（ 1 ）与 LED 灯组（ 2 ）之间，其特征在于：包括：
    电流检测单元（3a），串联接入在所述LED电源（1）与LED灯组（2）之间，用以检测所述LED电源（1）与LED灯组（2）之间的通电电流；
    开关控制单元（3d），串联接入在所述LED电源（1）与LED灯组（2）之间，用以控制所述LED电源（1）与LED灯组（2）之间的通断；
    控制单元，分别与所述电流检测单元（3a）和所述开关控制单元（3d）相连，用于根据所述电流检测单元（3a）检测到的通电电流，来控制所述开关控制单元（3d）控制 所述LED灯组（2）与所述LED电源（1）的通断。
  2. 根据权利要求1所述的 LED 保护装置，其特征在于：所述控制单元包括用于对电路实现自锁与解锁的自锁解锁组件（3b）和用于驱动开关控制单元的驱动控制组件（3c）；
    所述驱动控制组件（3c）与所述电流检测单元（3a）和所述开关控制单元（3d）连接，接收所述电流检测单元（3a）检测到的通电电流，当所述通电电流超出保护点时，控制所述驱动控制组件（3c）来驱动所述开关控制单元（3d）断开所述LED电源（1）与所述LED灯组（2）的供电；
    所述自锁解锁组件（3b）与所述电流检测单元（3a）和所述驱动控制组件（3c）连接，接收所述电流检测单元（3a）检测到的通电电流，当所述通电电流未超出保护点时，控制所述驱动控制组件（3c）来驱动所述开关控制单元（3d）恢复所述LED电源（1）与所述LED灯组（2）的供电。
  3. 根据权利要求1或2所述的LED保护装置，其特征在于：所述的电流检测单元（3a）包括 连接在所述LED电源和LED灯组之间检测通过电流的 电流侦测电阻、高分子正温热敏电阻或过电流识别电路。
  4. 根据权利要求2或3所述的LED保护装置，其特征在于：所述的开关控制单元（3d）为MOS管。
  5. 根据权利要求1-4任一项所述的LED保护装置，其特征在于，所述LED保护装置（3）还包括外壳，分别通过导线与所述LED电源（1）和LED灯组（2）导电连接。
  6. 根据权利要求5所述的LED照明独立式控制系统，其特征在于：所述LED保护装置（3）外壳上设有散热鳍片。
  7. 根据权利要求1-4任一项所述的LED保护装置，其特征在于: 所述LED保护装置（3）包括用于检测通电电流的电阻R1、控制电路通断的开关管Q1、运算放大器U1、运算放大器U2、二极管D1和二极管D2；
    电流从所述LED电源（1）正极流入运算放大器U1的反相输入端2，LED电源（1）负极连接电阻R1到运算放大器U1的同相输入端3，运算放大器U1的输出端1连接二极管D2到运算放大器U1的同相输入端3，用以实现电流正反馈，以达到自锁解锁目的；运算放大器U1的输出端1通过二极管D1连接运算放大器U2的反相输入端6，运算放大器U2的同相输入端5连接LED电源（1）正极，运算放大器U2的输出端与开关管Q1电连接,用以控制开关管Q1的通断。
  8. 根据权利要求7所述的LED保护装置，其特征在于：所述的LED保护装置（3）还包括限流电阻R8、R9、R2、R7；
    电流从所述LED电源（1）正极流经限流电阻R8、限流电阻R9流入运算放大器U1的反相输入端2；LED电源（1）负极连接电阻R1、限流电阻R2到运算放大器U1的同相输入端3；LED电源（1）正极通过限流电阻R8、限流电阻R7连接到运算放大器U2的同相输入端5。
PCT/CN2013/080644 2013-07-29 2013-08-01 一种 led 保护装置 WO2015013960A1 (zh)

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