WO2018210161A1 - 一种可吸收金属基板漏电流的led照明线性恒流驱动电路 - Google Patents

一种可吸收金属基板漏电流的led照明线性恒流驱动电路 Download PDF

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WO2018210161A1
WO2018210161A1 PCT/CN2018/086016 CN2018086016W WO2018210161A1 WO 2018210161 A1 WO2018210161 A1 WO 2018210161A1 CN 2018086016 W CN2018086016 W CN 2018086016W WO 2018210161 A1 WO2018210161 A1 WO 2018210161A1
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metal substrate
protection circuit
driving circuit
led
constant current
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PCT/CN2018/086016
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English (en)
French (fr)
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邵蕴奇
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上海路傲电子科技有限公司
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Publication of WO2018210161A1 publication Critical patent/WO2018210161A1/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]
    • H05B45/30—Driver circuits
    • H05B45/395—Linear regulators
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/395—Linear regulators
    • H05B45/397—Current mirror circuits
    • 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
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/20—Responsive to malfunctions or to light source life; for protection
    • H05B47/24—Circuit arrangements for protecting against overvoltage
    • 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 invention relates to a linear constant current driving circuit and an LED lighting product using the linear constant current driving circuit, which is suitable for LED lighting, and is particularly suitable for lighting products of metal casings.
  • Linear constant current drive schemes are widely used in LED lighting products.
  • components of the linear constant current driving circuit and LED particles are soldered on a metal substrate, and heat generated by the LED and the linear constant current driving circuit is conducted to the outer casing via the metal substrate.
  • the metal substrate is composed of a conductive layer, a metal layer and an insulating layer sandwiched between the conductive layer and the metal layer.
  • the insulating layer is usually thin, which makes the conductive layer and the metal layer have a better relationship. Large parasitic capacitance.
  • This leakage is particularly severe when the metal layer of the metal substrate is electrically insulated from the outer casing.
  • the mains VAC2 is connected to the input end of the rectifier BD2, and the LED2 is connected in series with the linear current source I2 and connected in parallel across the output of the rectifier BD2 to form a basic functional circuit of the linear constant current driving LED illumination scheme.
  • the electrical signal VS2, the parasitic capacitance C2A, the LED2 and the linear current source I2 constitute the first leakage circuit; the electrical signal VS2, the parasitic capacitance C2B and the linear current source I2 constitute a second leakage circuit.
  • the leakage current of the leakage circuit is sufficiently large, the LED 2 and the linear current source I2 will be damaged.
  • the second leakage loop formed by the electrical signal VS2, the parasitic capacitance C2B, and the linear current source I2 causes the linear current source I2 to be damaged.
  • the usual countermeasure is to connect a capacitor across the linear current source I2 to suppress the voltage peak across the linear current source I2, but this countermeasure is likely to cause LED2 to be defective, for example, when an external disturbance causes a mains transient, the flow A pulsed current across the capacitor at both ends of I2 can cause LED 2 to be damaged.
  • the invention provides an LED illumination linear constant current driving circuit capable of absorbing leakage current of a metal substrate, thereby overcoming the defects of the prior art and solving the above technical problems.
  • the invention provides an LED illumination linear constant current driving circuit capable of absorbing leakage current of a metal substrate, comprising: a metal substrate and an LED illumination linear constant current driving circuit; the metal substrate comprises a conductive layer, a metal layer and a sandwiched between the conductive layer and the metal layer Insulation layer; parasitic capacitance between conductive layer and metal layer, leakage current flowing through parasitic capacitance; LED illumination linear constant current driving circuit is all or partially soldered on the conductive layer of metal substrate; LED illumination linear constant current driving circuit,
  • the utility model comprises a rectifier, an LED, a linear current source, an overvoltage protection circuit and a diode; the rectifier comprises two inputs and two outputs; one end of the LED is connected to one output of the rectifier, and the other end is connected with a linear current source.
  • One end of the linear current source is connected to the other output of the rectifier; the overvoltage protection circuit is connected in parallel to the two output terminals of the rectifier; one end of the diode is connected to the intersection of the LED and the linear current source, and the other end is connected To the intersection of the LED and the rectifier.
  • the present invention provides an LED illumination linear constant current driving circuit capable of absorbing a leakage current of a metal substrate, and has the following characteristics: when the leakage current causes the voltage across the linear current source to exceed the voltage across the overvoltage protection circuit, the diode is turned on. When the leakage current causes the voltage across the linear current source to not exceed the voltage across the overvoltage protection circuit, the diode is turned off.
  • the present invention provides an LED illumination linear constant current driving circuit capable of absorbing a leakage current of a metal substrate, and has the following feature: when the leakage current causes the LED to be subjected to back pressure at both ends, the diode is turned on.
  • the present invention provides an LED illumination linear constant current driving circuit capable of absorbing a leakage current of a metal substrate, and has the following feature: the overvoltage protection circuit has an overvoltage threshold, and the voltage amplitude across the overvoltage protection circuit exceeds the overvoltage gate In a limited time, the current flowing through the overvoltage protection circuit increases.
  • the present invention provides an LED illumination linear constant current driving circuit capable of absorbing leakage current of a metal substrate, and has the following features: the overvoltage protection circuit is one or more of a Zener diode, a transient suppression diode, and a varistor. combination.
  • the present invention provides an LED illumination linear constant current driving circuit capable of absorbing a leakage current of a metal substrate, and has the following feature: the overvoltage protection circuit is a capacitor.
  • the present invention provides an LED illumination linear constant current driving circuit capable of absorbing a leakage current of a metal substrate, and further characterized by: a first lightning protection circuit and a second lightning protection circuit, the first lightning protection circuit comprising two inputs The two ends are connected to the mains, the two inputs are connected to the mains, and the two outputs are connected to the input of the rectifier; the second lightning protection circuit comprises three terminals, wherein the first terminal and the second terminal are respectively connected to the mains, The three terminals are connected to the metal layer of the metal substrate.
  • the present invention provides an LED illumination linear constant current driving circuit capable of absorbing leakage current of a metal substrate, and has the following features: a first lightning protection circuit for absorbing lightning energy at both ends of the commercial power, and a second lightning protection circuit for absorbing Lightning strike energy between the mains and the metal layer.
  • the present invention provides an LED illumination linear constant current driving circuit capable of absorbing a leakage current of a metal substrate, and has the following feature: the first lightning protection circuit includes at least one varistor.
  • the present invention provides an LED illumination linear constant current driving circuit capable of absorbing a leakage current of a metal substrate, and has the following features: the second lightning protection circuit includes at least two varistor and one gas discharge tube, and two varistor After being connected in series, the first terminal and the second terminal of the second lightning protection circuit are connected in parallel, and the intersection of the two varistor is connected to one end of the gas discharge tube, and the other end of the gas discharge tube is connected to the third terminal.
  • Figure 1 is a conventional LED lighting linear constant current driving circuit.
  • Figure 2 is a schematic view showing the structure of a metal substrate.
  • FIG. 3 is a schematic diagram of an LED illumination linear constant current driving circuit for draining current of an absorbable metal substrate of the present invention.
  • FIG. 4 is a circuit diagram of an LED illumination linear constant current driving circuit for absorbing current leakage of a metal substrate according to Embodiment 1.
  • FIG. 5 is a circuit diagram of a linear illumination driving circuit for LED illumination of an absorbable metal substrate according to a second embodiment.
  • FIG. 6 is a circuit diagram of a linear illumination driving circuit for LED illumination of an absorbable metal substrate according to a third embodiment.
  • FIG. 7 is a second lightning protection circuit diagram of the third embodiment.
  • Figure 2 is a schematic view showing the structure of a metal substrate.
  • FIG. 3 is a schematic diagram of an LED illumination linear constant current driving circuit for draining current of an absorbable metal substrate of the present invention.
  • the LED illumination linear constant current driving circuit for absorbing current leakage of the metal substrate of the present invention comprises a metal substrate and a linear constant current driving circuit for LED illumination.
  • the metal substrate comprises a conductive layer, a metal layer and an insulating layer sandwiched between the conductive layer and the metal layer; a parasitic capacitance between the conductive layer and the metal layer, and a leakage current flowing through the parasitic capacitance.
  • LED lighting linear constant current driving circuit including: rectifier BD3, LED3, linear current source I3, overvoltage protection circuit SPD3, diode D3.
  • the rectifier BD3 comprises two inputs and two outputs. One end of the LED 3 is connected to one output of the rectifier BD3, the other end is connected to one end of the linear current source I3, and the other end of the linear current source I3 is connected to the other output of the rectifier BD3.
  • a linear current source I3 is used to limit the current flowing through the LED 3.
  • the overvoltage protection circuit SPD3 is connected in parallel to the two outputs of the rectifier BD3.
  • One end of the diode D3 is connected to the intersection of the LED 3 and the linear current source I3, and the other end is connected to the intersection of the LED 3 and the rectifier BD3.
  • the diode D3 When the leakage current causes the voltage across the linear current source I3 to exceed the voltage across the overvoltage protection circuit SPD3, the diode D3 is turned on, releasing the overcurrent energy to the overvoltage protection circuit SPD3, thereby avoiding the breakdown of the linear current source I3. When the leakage current causes the LED3 to bear the back pressure at both ends, the diode D3 is turned on to avoid reverse breakdown of the LED3.
  • FIG. 4 is a circuit diagram of an LED illumination linear constant current driving circuit for absorbing current leakage of a metal substrate according to Embodiment 1.
  • the LED illumination linear constant current driving circuit of the leakage current of the absorbing metal substrate of the first embodiment includes a metal substrate and a linear constant current driving circuit for LED illumination.
  • LED lighting linear constant current driving circuit including: rectifier BD4, LED4, linear current source I4, overvoltage protection circuit SPD4, diode D4.
  • the rectifier BD4 comprises two inputs and two outputs, the two outputs being divided into a positive pole and a negative pole.
  • the anode of the LED 4 is connected to the positive output of the rectifier BD4, the cathode is connected to the anode of the linear current source I4, and the cathode of the linear current source I4 is connected to the negative output of the rectifier BD4.
  • a linear current source I4 is used to limit the current flowing through the LED 4.
  • the overvoltage protection circuit SPD4 is a transient suppression diode or a varistor or a Zener diode connected in parallel on the two output ends of the rectifier BD4.
  • the anode of diode D4 is connected to the junction of LED4 and linear current source I4, and the cathode is connected to the intersection of LED4 and rectifier BD4.
  • the diode D4 When the leakage current causes the voltage across the linear current source I4 to exceed the voltage across the overvoltage protection circuit SPD4, the diode D4 is turned on, releasing the overcurrent energy to the overvoltage protection circuit SPD4, thereby avoiding the breakdown of the linear current source I4. When the leakage current causes the LED4 to bear the back pressure at both ends, the diode D4 is turned on to avoid reverse breakdown of the LED4.
  • Fig. 5 is a circuit diagram showing the LED illumination linear constant current driving circuit of the leakage current of the absorbable metal substrate of the second embodiment.
  • the LED illumination linear constant current driving circuit of the absorbing metal substrate leakage current of the second embodiment comprises a metal substrate and an LED illumination linear constant current driving circuit.
  • LED lighting linear constant current driving circuit including: rectifier BD5, LED5, linear current source I5, overvoltage protection circuit SPD5, diode D5.
  • the rectifier BD5 includes two input terminals and two output terminals, and the two output terminals are a positive electrode and a negative electrode, respectively.
  • the cathode of the LED 5 is connected to the negative output of the rectifier BD5, the anode is connected to the cathode of the linear current source I5, and the anode of the linear current source I5 is connected to the positive output of the rectifier BD5.
  • a linear current source I5 is used to limit the current flowing through the LED 5.
  • the overvoltage protection circuit SPD5 is a capacitor, the cathode of the diode D5 is connected to the intersection of the LED 5 and the linear current source I5, and the anode is connected to the intersection of the LED 5 and the rectifier BD5.
  • the diode D5 When the leakage current causes the voltage across the linear current source I5 to exceed the voltage across the overvoltage protection circuit SPD5, the diode D5 is turned on, releasing the overcurrent energy to the overvoltage protection circuit SPD5, thereby avoiding the breakdown of the linear current source I5. When the leakage current causes the LED 5 to bear the back pressure at both ends, the diode D5 is turned on to avoid reverse breakdown of the LED 5.
  • the voltage across the overvoltage protection circuit SPD5 rises when the diode D5 is turned on, and the capacity of the capacitor needs to be large enough to ensure that the maximum voltage across the diode does not exceed the breakdown voltage of the linear current source I5 during the conduction of the diode.
  • FIG. 6 is a circuit diagram of a linear illumination driving circuit for LED illumination of an absorbable metal substrate according to a third embodiment.
  • the LED illumination linear constant current driving circuit of the leakage current of the absorbing metal substrate of the third embodiment includes a metal substrate and a linear constant current driving circuit for LED illumination.
  • the LED illumination linear constant current driving circuit comprises: a rectifier BD6, an LED6, a linear current source I6, an overvoltage protection circuit SPD6, a diode D6, a first lightning protection circuit SPD7 and a second lightning protection circuit second lightning protection circuit SPD8.
  • the rectifier BD6 comprises two inputs and two outputs. One end of the LED 6 is connected to one output of the rectifier BD6, the other end is connected to one end of the linear current source I6, and the other end of the linear current source I6 is connected to the other output of the rectifier BD6.
  • a linear current source I6 is used to limit the current flowing through the LED 6.
  • the overvoltage protection circuit SPD6 is connected in parallel to the two outputs of the rectifier BD6. One end of the diode D6 is connected to the intersection of the LED 6 and the linear current source I6, and the other end is connected to the intersection of the LED 6 and the rectifier BD6.
  • the first lightning protection circuit SPD7 comprises two input terminals 1, 2 and two output terminals 3, 4, two input terminals 1, 2 connected to the mains, and two output terminals 3, 4 connected to the input of the rectifier BD6.
  • FIG. 7 is a second lightning protection circuit diagram of the third embodiment.
  • the second lightning protection circuit SPD8 includes three terminals 5, 6, and 7; wherein the first terminal 5 and the second terminal 6 are respectively connected to the commercial power, and the terminal 7 is connected to the metal layer E of the metal substrate.
  • the first lightning protection circuit SPD7 is used to absorb the lightning strike energy between the commercial power L and N
  • the second lightning protection circuit SPD8 is used to absorb the lightning strike energy between the commercial power and the metal layer E.
  • the first lightning protection circuit SPD7 includes at least one varistor.
  • the second lightning protection circuit SPD8 includes two varistor M1, M2 and a gas discharge tube GT1.
  • the two varistor M1, M2 are connected in series and then connected in parallel to the first terminal 5 and the second terminal 6 of the second lightning protection circuit SPD8, and the intersection of the two varistor M1, M2 is connected to one end of the gas discharge tube GT1.
  • the other end of the gas discharge tube GT1 is connected to the third terminal 7.
  • the diode D6 When the leakage current causes the voltage across the linear current source I6 to exceed the voltage across the overvoltage protection circuit SPD6, the diode D6 is turned on, releasing the leakage current energy to the overvoltage protection circuit SPD6, thereby avoiding the breakdown of the linear current source I6. When the leakage current causes the LED 6 to bear the back pressure at both ends, the diode D6 is turned on to avoid reverse breakdown of the LED 6.
  • the varistor in the SPD 7 breaks down, so that the voltage flowing into the rectifier BD6 is within a safe range.
  • the varistor and/or the gas discharge tube in the SPD 8 breaks down, so that the voltage between the metal layer E of the metal substrate and the conductive layer is safe. In the range, the insulation layer of the metal substrate is prevented from being broken down.
  • the present invention provides a bleed passage for the leakage current of the metal substrate, and the LED and the linear constant current driving circuit on the metal substrate are prevented from being broken by the leakage energy, so that the LED lighting product based on the present invention is no longer correct.
  • the parasitic capacitance of the metal substrate is sensitive, which improves product stability.

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Abstract

本发明提供一种可吸收金属基板漏电流的LED照明线性恒流驱动电路，包括：金属基板和LED照明线性恒流驱动电路；金属基板包括导电层，金属层和夹在导电层和金属层之间的绝缘层；导电层和金属层之间具有寄生电容，寄生电容上流过漏电流；LED照明线性恒流驱动电路全部或者部分焊接在金属基板的导电层上；LED照明线性恒流驱动电路，包括一整流器、一LED、一线性电流源、一过压保护电路和一二极管。其优点在于当漏电流导致线性电流源两端的电压超过过压保护电路两端的电压时，二极管导通，释放过电流能量到过压保护电路上，避免线性电流源击穿；当漏电流导致两端承受反压时，二极管导通，避免反向击穿。

Description

一种可吸收金属基板漏电流的LED照明线性恒流驱动电路 技术领域
本发明涉及一种线性恒流驱动电路和利用该线性恒流驱动电路的LED照明产品，适用于LED照明，尤其适用于金属外壳的照明产品。
背景技术
在LED照明产品上，线性恒流驱动方案被广泛采用。通常，在线性恒流驱动的LED照明设备上，线性恒流驱动电路的元件和LED颗粒均焊接在金属基板上，LED和线性恒流驱动电路产生的热量经由金属基板传导到外壳上。
金属基板由导电层，金属层和夹在导电层和金属层之间的绝缘层构成，为确保金属基板具有良好的导热性能，绝缘层通常很薄，这使得导电层和金属层之间具有较大的寄生电容。
在对LED照明产品进行耐压测试、雷击测试或其他抗扰度测试时，会在市电和外壳之间施加电信号，这导致金属基板的金属层和导电层之间的寄生电容上流过漏电流，该漏电流会在线性恒流驱动电路各元件上和LED上产生漏电电压，当该漏电电压超过线性恒流驱动电路各元件和LED的极限参数时，LED照明驱动电路或LED将损坏。
当金属基板的金属层与外壳为非绝缘电气连接时，该漏电尤为严重。
下面结合图1做原理性说明。
图1中，市电VAC2与整流器BD2的输入端相连，LED2与线性电流源I2串联后并联在整流器BD2的输出两端,构成了线性恒流驱动的LED照明方案的基本功能电路。
电信号VS2、寄生电容C2A、LED2和线性电流源I2构成第一个漏电回路；电信号VS2、寄生电容C2B和线性电流源I2构成第二个漏电回路。当漏电回路的漏电流足够大时，LED2和线性电流源I2将会损坏。
实际应用中，电信号VS2、寄生电容C2B和线性电流源I2构成的第二个漏电回路导致线性电流源I2损坏较常见。为改善该问题，通常的对策是在线性电流源I2两端并联电容，以抑制线性电流源I2两端的电压峰值，但该对策容易导致LED2不良，例如在外部扰动导致市电瞬变时，流过并联在I2两端电容的脉冲电流会导致LED2损坏。
因此，需要一种可以吸收漏电流的线性恒流驱动电路。
发明内容
本发明提供了一种可吸收金属基板漏电流的LED照明线性恒流驱动电路，从而克服现有技术的缺陷，解决上述技术问题。
本发明提供一种可吸收金属基板漏电流的LED照明线性恒流驱动电路，包括：金属基板和LED照明线性恒流驱动电路；金属基板包括导电层，金属层和夹在导电层和金属层之间的绝缘层；导电层和金属层之间具有寄生电容，寄生电容上流过漏电流；LED照明线性恒流驱动电路全部或者部分焊接在金属基板的导电层上；LED照明线性恒流驱动电路，包括一整流器、一LED、一线性电流源、一过压保护电路和一二极管；整流器包含两个输入端和两个输出端；LED的一端与整流器的一个输出端相连，另一端与线性电流源的一端相连，线性电流源的另一端连接到整流器的另一个输出端；过压保护电路并联在整流器的两个输出端上；二极管的一端连接到LED与线性电流源的交汇处，另一端连接到LED与 整流器的交汇处。
进一步，本发明提供一种可吸收金属基板漏电流的LED照明线性恒流驱动电路，还具有以下特征：当漏电流导致线性电流源两端的电压超过过压保护电路两端的电压时，二极管导通；当漏电流导致线性电流源两端的电压未超过过压保护电路两端的电压时，二极管截止。
进一步，本发明提供一种可吸收金属基板漏电流的LED照明线性恒流驱动电路，还具有以下特征：当漏电流导致LED两端承受反压时，二极管导通。
进一步，本发明提供一种可吸收金属基板漏电流的LED照明线性恒流驱动电路，还具有以下特征：过压保护电路具有一过压门限，当过压保护电路两端的电压幅度超过过压门限时，流过过压保护电路的电流增加。
进一步，本发明提供一种可吸收金属基板漏电流的LED照明线性恒流驱动电路，还具有以下特征：过压保护电路为齐纳二极管、瞬态抑制二极管、压敏电阻中的一个或多个组合。
进一步，本发明提供一种可吸收金属基板漏电流的LED照明线性恒流驱动电路，还具有以下特征：过压保护电路为一电容。
进一步，本发明提供一种可吸收金属基板漏电流的LED照明线性恒流驱动电路，还具有以下特征：还包括第一防雷电路和第二防雷电路，第一防雷电路包含两个输入端和两个输出端，两个输入端连接市电，两个输出端与整流器的输入端相连；第二防雷电路包含三个端子，其中第一端子、第二端子分别连接市电，第三端子与金属基板的金属层相连。
进一步，本发明提供一种可吸收金属基板漏电流的LED照明线性恒流驱动电路，还具有以下特征：第一防雷电路用以吸收市电两端的雷击能量，第二防雷电路用以吸收市电与金属层之间的雷击能量。
进一步，本发明提供一种可吸收金属基板漏电流的LED照明线性恒流驱动电路，还具有以下特征：第一防雷电路至少包含一压敏电阻。
进一步，本发明提供一种可吸收金属基板漏电流的LED照明线性恒流驱动电路，还具有以下特征：第二防雷电路至少包含两个压敏电阻和一气体放电管，两个压敏电阻串联后并联在第二防雷电路的第一端子和第二端子，两个压敏电阻的交汇点与气体放电管的一端相连，气体放电管的另一端与第三端子相连。
附图说明
图1是传统的LED照明线性恒流驱动电路。
图2金属基板的结构示意图。
图3是本发明的可吸收金属基板漏电流的LED照明线性恒流驱动电路的原理图。
图4是实施例一的可吸收金属基板漏电流的LED照明线性恒流驱动电路图。
图5是实施例二的可吸收金属基板漏电流的LED照明线性恒流驱动电路图。
图6是实施例三的可吸收金属基板漏电流的LED照明线性恒流驱动电路图。
图7是实施例三的第二防雷电路图。
具体实施方式：
以下结合附图和具体实施例，对本发明做进一步说明。
图2金属基板的结构示意图。
图3是本发明的可吸收金属基板漏电流的LED照明线性恒流驱动电路的原理图。
如图2和图3所示，本发明的可吸收金属基板漏电流的LED照明线性恒流驱动电路，包括金属基板和LED照明线性恒流驱动电路。金属基板包括导电层，金属层和夹在导电层和金属层之间的绝缘层；导电层和金属层之间具有寄生电容，寄生电容上流过漏电流。
LED照明线性恒流驱动电路，包括：整流器BD3、LED3,线性电流源I3、过压保护电路SPD3、二极管D3。整流器BD3包含两个输入端和两个输出端。LED3的一端与整流器BD3的一个输出端相连，另一端与线性电流源I3的一端相连，线性电流源I3的另一端连接到整流器BD3的另一个输出端。线性电流源I3用以限制流过LED3的电流。过压保护电路SPD3并联在整流器BD3的两个输出端上。二极管D3的一端连接到LED3与线性电流源I3的交汇处，另一端连接到LED3与整流器BD3的交汇处。
其工作原理为：
当漏电流导致线性电流源I3两端的电压超过过压保护电路SPD3两端的电压时，二极管D3导通，释放过电流能量到过压保护电路SPD3上，避免线性电流源I3击穿。当漏电流导致LED3两端承受反压时，二极管D3导通，避免LED3反向击穿。
实施例一
图4是实施例一的可吸收金属基板漏电流的LED照明线性恒流驱动电路图。
如图2和图4所示，实施例一的可吸收金属基板漏电流的LED照明线性恒流驱动电路，包括金属基板和LED照明线性恒流驱动电路。
LED照明线性恒流驱动电路，包括：整流器BD4、LED4、线性电流源I4、过压保护电路SPD4、二极管D4。整流器BD4包含两个输入端和两个输出端，两个输出端分为正极和负极。
LED4的阳极与整流器BD4的正极输出端相连，阴极与线性电流源I4的正极相连，线性电流源I4的负极连接到整流器BD4的负极输出端。线性电流源I4用以限制流过LED4的电流。本实施例中，过压保护电路SPD4为一瞬态抑制二极管或者压敏电阻或者齐纳二极管，并联在整流器BD4的两个输出端上。二极管D4的阳极连接到LED4与线性电流源I4的交汇处，阴极连接到LED4与整流器BD4的交汇处。
其工作原理为：
当漏电流导致线性电流源I4两端的电压超过过压保护电路SPD4两端的电压时，二极管D4导通，释放过电流能量到过压保护电路SPD4上，避免线性电流源I4击穿。当漏电流导致LED4两端承受反压时，二极管D4导通，避免LED4反向击穿。
实施例二
图5是实施例二的可吸收金属基板漏电流的LED照明线性恒流驱动 电路图。
如图2和图4所示，实施例二的可吸收金属基板漏电流的LED照明线性恒流驱动电路，包括金属基板和LED照明线性恒流驱动电路。
LED照明线性恒流驱动电路，包括：整流器BD5、LED5,线性电流源I5、过压保护电路SPD5、二极管D5。整流器BD5包含两个输入端和两个输出端，两个输出端分别为正极和负极。
LED5的阴极与整流器BD5的负极输出端相连，阳极与线性电流源I5的负极相连，线性电流源I5的正极连接到整流器BD5的正极输出端。线性电流源I5用以限制流过LED5的电流。本实施例中，过压保护电路SPD5为一电容，二极管D5的阴极连接到LED5与线性电流源I5的交汇处，阳极连接到LED5与整流器BD5的交汇处。
其工作原理为：
当漏电流导致线性电流源I5两端的电压超过过压保护电路SPD5两端的电压时，二极管D5导通，释放过电流能量到过压保护电路SPD5上，避免线性电流源I5击穿。当漏电流导致LED5两端承受反压时，二极管D5导通，避免LED5反向击穿。
过压保护电路SPD5两端电压在二极管D5导通时会上升，电容的容量需要足够大，确保在二极管导通期间，其两端电压的最大值不超过线性电流源I5的击穿电压。
实施例三
图6是实施例三的可吸收金属基板漏电流的LED照明线性恒流驱动电路图。
如图2和图6所示，实施例三的可吸收金属基板漏电流的LED照明线性恒流驱动电路，包括金属基板和LED照明线性恒流驱动电路。
LED照明线性恒流驱动电路，包括：整流器BD6、LED6,线性电流源I6、过压保护电路SPD6、二极管D6、第一防雷电路SPD7和第二防雷电路第二防雷电路SPD8。
整流器BD6包含两个输入端和两个输出端。LED6的一端与整流器BD6的一个输出端相连，另一端与线性电流源I6的一端相连，线性电流源I6的另一端连接到整流器BD6的另一个输出端。线性电流源I6用以限制流过LED6的电流。过压保护电路SPD6并联在整流器BD6的两个输出端上。二极管D6的一端连接到LED6与线性电流源I6的交汇处，另一端连接到LED6与整流器BD6的交汇处。
第一防雷电路SPD7包含两个输入端1、2和两个输出端3、4，两个输入端1、2连接市电，两个输出端3、4与整流器BD6的输入端相连。
图7是实施例三的第二防雷电路图。
如图7所示，第二防雷电路SPD8包含三个端子5、6、7；其中第一端子5、第二端子6分别连接市电，端子7与金属基板的金属层E相连。第一防雷电路SPD7用以吸收市电L、N之间的雷击能量，第二防雷电路SPD8用以吸收市电与金属层E之间的雷击能量。第一防雷电路SPD7至少包含一压敏电阻。第二防雷电路SPD8包含两个压敏电阻M1、M2和一气体放电管GT1。两个压敏电阻M1、M2串联后并联在所述第二防雷电路SPD8的第一端子5和第二端子6，两个压敏电阻M1、M2的交汇点与气体放电管GT1的一端相连，气体放电管GT1的另一端与第三端子7相连。
其工作原理为：
当漏电流导致线性电流源I6两端的电压超过过压保护电路SPD6两端的电压时，二极管D6导通，释放漏电流能量到过压保护电路SPD6上，避免线性电流源I6击穿。当漏电流导致LED6两端承受反压时，二极管D6导通，避免LED6反向击穿。
当市电两端L-N之间有雷击能量时，SPD7内的压敏电阻击穿，使流入整流器BD6的电压在安全范围内。当市电L或N任一端与金属层E之间有雷击能量时，SPD8内的压敏电阻和/或气体放电管击穿，使金属基板的金属层E与导电层之间的电压在安全范围内，避免金属基板的绝缘层被击穿。
由上述实施例可知，本发明为金属基板的漏电流提供了泄放通道，避免了金属基板上的LED和线性恒流驱动电路被漏电能量击穿，使得基于本发明的LED照明产品不再对金属基板的寄生电容敏感，提高了产品稳定性。
以上具体实施例仅描述了本方案的主要特征和创新点。本领域的技术人员应该了解，本方案不受上述实施例的限制。在不脱离本创新点和保护范围的前提下，本方案还会有各种变化，这些变化和改进都将落入本方案要求保护的范围内。本方案要求保护的范围由所附的权利要求书及其等效物限定。
应当注意，上述实施例是为了说明而不是限制本发明，那些本领域技术人员将能够在不背离所附权利要求的范围的条件下设计许多可选实施例。词语“包含”不排除那些与权利要求中列出的元件或步骤不同的 元件或步骤的存在。元件前的词语“一”或“一个”不排除多个这种元件的存在，在列举几种电路权利要求中，这些装置中的几个可以由一个来表现，硬件项也是同样，仅仅因为某些方法是在不同的从属权利要求中描述的，并不说明这些方法的组合不能用来获利。
需要说明的是，在本文中，诸如第一和第二等的关系术语仅仅用来将一个实体或者操作与另一个实体或操作区分开来，而不一定要求或者暗示这些实体或操作之间存在任何这种实际的关系或者顺序，而且，术语“包含”、“包括”或者任何其他变体意在涵盖非排他性的包含，从而使得包含一系列要素的过程、方法、物品或者设备不仅包括那些要素，而且还包括那些明确列出的其他要素，或者是还包括为这种过程、方法、物品或者设备所固有的要素，术语“相连”、“连接”、“连接到”或者其他变体，不仅仅包括将两个实体直接相连接，也包括通过具有有益改善效果的其他实体间接相连接。

Claims (10)

  1. 一种可吸收金属基板漏电流的LED照明线性恒流驱动电路，其特征在于：包括金属基板和LED照明线性恒流驱动电路；
    所述金属基板包括导电层，金属层和夹在所述导电层和所述金属层之间的绝缘层；所述导电层和金属层之间具有寄生电容，所述寄生电容上流过漏电流；
    所述LED照明线性恒流驱动电路全部或者部分焊接在所述金属基板的导电层上；
    所述LED照明线性恒流驱动电路，包括一整流器、一LED、一线性电流源、一过压保护电路和一二极管；
    所述整流器包含两个输入端和两个输出端；
    所述LED的一端与所述整流器的一个输出端相连，另一端与所述线性电流源的一端相连，所述线性电流源的另一端连接到所述整流器的另一个输出端；
    所述过压保护电路并联在所述整流器的两个输出端上；
    所述二极管的一端连接到所述LED与所述线性电流源的交汇处，另一端连接到所述LED与所述整流器的交汇处。
  2. 根据权利要求1所述的可吸收金属基板漏电流的LED照明线性恒流驱动电路，其特征在于：
    当所述漏电流导致所述线性电流源两端的电压超过所述过压保护电路两端的电压时，所述二极管导通；
    当所述漏电流导致所述线性电流源两端的电压未超过所述过压 保护电路两端的电压时，所述二极管截止。
  3. 根据权利要求1所述的可吸收金属基板漏电流的LED照明线性恒流驱动电路，其特征在于：当所述漏电流导致LED两端承受反压时，所述二极管导通。
  4. 根据权利要求1所述的可吸收金属基板漏电流的LED照明线性恒流驱动电路，其特征在于：所述过压保护电路具有一过压门限，当所述过压保护电路两端的电压幅度超过所述过压门限时，流过所述过压保护电路的电流增加。
  5. 根据权利要求1所述的可吸收金属基板漏电流的LED照明线性恒流驱动电路，其特征在于：所述过压保护电路为齐纳二极管、瞬态抑制二极管、压敏电阻中的一个或多个组合。
  6. 根据权利要求1所述的可吸收金属基板漏电流的LED照明线性恒流驱动电路，其特征在于：所述过压保护电路为一电容。
  7. 根据权利要求1至6中任意一项所述的可吸收金属基板漏电流的LED照明线性恒流驱动电路，其特征在于：还包括第一防雷电路和第二防雷电路，所述第一防雷电路包含两个输入端和两个输出端，两个输入端连接市电，两个输出端与所述整流器的输入端相连；所述 第二防雷电路包含三个端子，其中第一端子、第二端子分别连接市电，第三端子与所述金属基板的金属层相连。
  8. 根据权利要求7所述的可吸收金属基板漏电流的LED照明线性恒流驱动电路，其特征在于：所述第一防雷电路用以吸收所述市电两端的雷击能量，所述第二防雷电路用以吸收所述市电与金属层之间的雷击能量。
  9. 根据权利要求7所述的可吸收金属基板漏电流的LED照明线性恒流驱动电路，其特征在于：所述第一防雷电路至少包含一压敏电阻。
  10. 根据权利要求7所述的可吸收金属基板漏电流的LED照明线性恒流驱动电路，其特征在于：所述第二防雷电路至少包含两个压敏电阻和一气体放电管，所述两个压敏电阻串联后并联在所述第二防雷电路的第一端子和第二端子，所述两个压敏电阻的交汇点与所述气体放电管的一端相连，所述气体放电管的另一端与第三端子相连。
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