WO2020024892A1 - 一种线性恒流驱动芯片及多芯片并联led照明驱动电路 - Google Patents

一种线性恒流驱动芯片及多芯片并联led照明驱动电路 Download PDF

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WO2020024892A1
WO2020024892A1 PCT/CN2019/098104 CN2019098104W WO2020024892A1 WO 2020024892 A1 WO2020024892 A1 WO 2020024892A1 CN 2019098104 W CN2019098104 W CN 2019098104W WO 2020024892 A1 WO2020024892 A1 WO 2020024892A1
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linear constant
constant current
pin
chip
output
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PCT/CN2019/098104
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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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    • 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]
    • 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
    • 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]

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  • the invention relates to an LED lighting driving circuit, in particular to a linear constant current driving chip and a multi-chip parallel LED lighting driving circuit.
  • Chips and peripheral circuits are usually used in linear constant current LED lighting driver circuits.
  • the chip includes a control circuit and a current source; a variety of peripheral circuits are common, such as a current setting circuit, a loop compensation circuit, a filter circuit, a detection circuit, and an abnormal protection circuit.
  • peripheral circuits corresponding to multiple groups of chips also need to be used together, which results in very complicated peripheral circuits.
  • FIG. 1 is an existing LED lighting driving circuit with three chips connected in parallel, including a power supply unit, an LED array, three chips, and three peripheral circuits.
  • Each chip includes a control circuit and a current source. One end of the control circuit is connected to one end of the current source, the other end of the control circuit is connected to the input pin MI, and the other end of the current source is connected to the current terminal pin MOUT.
  • the three peripheral circuits are respectively connected to the input pins MI of the three chips, the current terminal pins MOUT of the three chips are all connected to the same end of the LED array, and the other end of the LED array is connected to the power supply unit.
  • each chip needs to be connected to a corresponding peripheral circuit, so that there are many circuit devices and the circuit connection is complicated.
  • An object of the present invention is to provide a linear constant current driving chip and a multi-chip parallel LED lighting driving circuit, so as to solve the problems raised in the background art described above.
  • a linear constant current driving chip having current terminal pins, input pins, and output pins;
  • the linear constant current driving chip includes a power conversion unit, and the power conversion The unit controls the current flowing through the LED array through the current terminal pin;
  • the input pin is used to detect various external signals and react to the output pin, and the state of the output pin is subject to the input Pin control.
  • the linear constant current driving chip further includes an input buffer circuit and an output buffer circuit; an output terminal of the output buffer circuit is connected to the output pin, and an output terminal of the input buffer circuit is connected to the output buffer circuit.
  • An input terminal, an input terminal of the input buffer circuit is connected to the input pin: an output terminal of the current conversion circuit is connected to the current terminal pin, and an input terminal is connected to an output terminal of the input buffer circuit.
  • the output pin generates a current signal with an equal value.
  • the output pin generates a voltage signal with an equal value.
  • the output pin generates the same logic signal.
  • the invention also provides a multi-chip parallel LED lighting driving circuit, which includes peripheral circuits, a power supply unit, an LED array, and a plurality of linear constant current driving chips as claimed in claim 1; the peripheral circuits are connected to one of the The input pin of the linear constant current driving chip is described, and the output pin of the linear constant current driving chip is in turn the next linear
  • One end of the LED array is connected to a power supply unit, and the other end is respectively connected to a current terminal pin of the linear constant current driving chip.
  • the input pin of the first linear constant current driving chip detects the
  • peripheral end signals are sent to all the linear constant current chips, and the power conversion units in all the linear constant current chips are controlled to synchronously control the current flowing through the LED array.
  • the linear constant current drive chip has at least one of the input pins; the output pins of the linear constant current drive chip are sequentially connected to corresponding input pins on the next linear constant current drive chip, respectively.
  • peripheral circuits are partially or completely integrated into any one or more of the linear constant current driving chips.
  • the present invention has the beneficial effects that the multi-chip parallel LED lighting driving circuit of the present invention only needs a set of various peripheral circuits, which reduces the cost and simplifies the structure.
  • 1 is a schematic structural diagram of an existing multi-chip parallel LED lighting driving circuit
  • FIG. 2 is a schematic structural diagram of a first embodiment of a multi-chip parallel LED lighting driving circuit according to the present invention
  • FIG. 3 is a schematic structural diagram of a second embodiment of a multi-chip parallel LED lighting driving circuit according to the present invention.
  • linear constant current driving chip 2. peripheral circuit; 21; control circuit; 22. detection circuit; 3. LED array; 31. first LED array; 32; second LED array; Power supply unit.
  • the multi-chip parallel LED lighting driving circuit in this embodiment includes a peripheral circuit 2, an LED array 3, a power supply unit 4, and three linear constant current driving chips 1.
  • the power supply unit 4 is connected to one end of the LED array 3.
  • the peripheral circuit 2 has a peripheral terminal 1SEXT, and includes a current source 1IR and a resistor 1R.
  • the negative pole of the current source 1IR is grounded, and the positive pole is connected to the peripheral end 1SEXT and the other end of the resistor 1R.
  • the other end of the resistor 1R is connected to the end of the LED array 3 that is not connected to the power supply unit 4, and is used to detect the voltage amplitude of the power supply unit 4.
  • the current source lIR and the resistor 1R constitute a current reference that is affected by the magnitude of the mains voltage.
  • the current reference is output through the peripheral terminal lSEXT. When the mains voltage increases, the current reference current decreases. When the mains voltage decreases, the current reference decreases. The current reference current increases.
  • the linear constant current driving chip 1 has an input pin SI, an output pin SO, and a current terminal pin IO, and includes an input buffer circuit IA, an output buffer circuit IB, and a current conversion circuit IC.
  • the input buffer circuit IA, the output buffer circuit IB, and the current conversion circuit IC are all current sources.
  • the negative pole of the input buffer circuit IA is connected to the input pin SI; the negative pole of the output buffer circuit IB is grounded, and the positive pole is connected to the output pin SO; the negative pole of the current conversion circuit IC is grounded, and the positive pole is connected to the current terminal pin IO.
  • the input buffer circuit IA and the output buffer circuit IB constitute a current mirror; the input buffer circuit IA and the current conversion circuit IC constitute another current mirror. If the effective input signal of the input pin SI of the linear constant current driving chip 1 is a pull-down current, the output signal of the output pin SO is also a pull-down current and is equal to the pull-down current amplitude of the input pin SI.
  • the linear constant current driver chips 1 are arranged in sequence.
  • the input pin SI of each linear constant current driver chip 1 is connected in sequence with the output pin SO of the previous linear constant current driver chip 1.
  • the input pin SI is connected to the peripheral end lSEXT of the peripheral circuit 2, and the output pin SO of the last linear constant current driving chip 1 is left empty.
  • the current terminal pins IO of the linear constant current driving chip 1 are all connected to the LED array 3 that is not connected to the power supply unit 4.
  • the peripheral end lSEXT of the peripheral circuit 2 sets an electric signal at the input pin SI of the first linear constant current driving chip 1.
  • the electric signal generates a set current to drive the LED array 3 through the input buffer circuit IA and the current conversion circuit IC. On the other hand, it is output to the output pin SO via the output buffer circuit IB.
  • the output pin SO of the linear constant current drive chip 1 sets the electric signal at the input pin SI of the next linear constant current drive chip 1, and so on, so that the current terminal pins IO of the three linear constant current drive chips 1 are generated.
  • the set current drives the LED array 3.
  • the multi-chip parallel LED lighting driving circuit only needs a set of peripheral circuits 2, which reduces the cost and simplifies the structure.
  • the linear constant current driving chips in the multi-chip parallel LED lighting driving circuit of the present invention are sequentially connected, the structure is simple and convenient for wiring, and the external circuits of the chip do not cross, which improves the stability of the circuit.
  • the multi-chip parallel LED lighting driving circuit in this embodiment includes a peripheral circuit 2, an LED array 3, a power supply unit 4, and three linear constant current driving chips 1.
  • the LED array includes a first LED array 31 and a second LED array 32.
  • the first LED array 31 and the second LED array 32 have two color temperatures of warm white and cool white, respectively.
  • the output end of the power supply unit 4 is connected to one end of the first LED array 31 and the second LED array 32.
  • the peripheral circuit 2 has a first peripheral terminal EXTA and a second peripheral terminal EXTB, and includes a control circuit 21 and a detection circuit 22. One end of the detection circuit 22 is connected to the control circuit 21 and the other end is connected to the power supply unit 4 to detect the switching state of the power supply unit. This state is processed by the control circuit and fed to the peripheral terminals EXTA and EXTB as the brightness control signals of LEDA and LEDB, respectively.
  • the two output terminals of the control circuit are respectively connected to the first peripheral terminal EXTA and the second peripheral terminal EXTB.
  • the linear constant current driving chip 1 has a first input pin SIA, a second input pin SIB, a first output pin SOA, a second output pin SOB, a first current terminal pin IOA, and a second current terminal pin IOB. It includes a first input buffer circuit BIA, a second input buffer circuit BIB, a first output buffer circuit BOA, a second output buffer circuit BOB, a first current conversion circuit IA, and a second current conversion circuit IB.
  • the first input buffer circuit BIA, the second input buffer circuit BIB, the first output buffer circuit BOA, and the second output buffer circuit BOB are all voltage followers or logic followers. The voltage followers or logic followers can enable the followers.
  • the output terminal copies the voltage signal or logic signal of the input terminal; the input terminal of the first input buffer circuit BIA is connected to the first input pin SIA, the output terminal is connected to the input terminal of the first output buffer circuit BOA; the input terminal of the second input buffer circuit BIB Connected to the second input pin SIB, the output is connected to the input of the second output buffer circuit BOB; the output of the first output buffer circuit BOA is connected to the first output pin SOA; the output of the second output buffer circuit BOB is connected to the second Output pin SOB.
  • the first current conversion circuit IA and the second current conversion circuit IB are adjustable constant current sources with a control terminal; the positive electrode of the first current conversion circuit IA is connected to the first current terminal pin IOA, the negative electrode is grounded, and the control terminal is connected to the first The output terminal of the input buffer circuit BIA; the positive electrode of the second current conversion circuit IB is connected to the second current terminal pin IOB, the negative electrode is grounded, and the control terminal is connected to the output terminal of the second input buffer circuit BIB.
  • the linear constant current driver chips 1 are arranged in sequence.
  • the first input pin SIA of each linear constant current driver chip 1 is connected in sequence with the first output pin SOA of the previous linear constant current driver chip 1 and the second input pin SIB is sequentially.
  • the first current terminal pins IOA of the three linear constant current driving chips 1 are all connected to the end of the first LED array 31 that is not connected to the power supply unit 4, and the second current terminal pins IOA are connected to the second LED array 32 and are not connected to the power supply unit. 4 connected end.
  • the signal received by the first constant input pin SIA and the second constant input pin SIB of the linear constant current drive chip 1 is a voltage signal or a logic signal, so that the first output pin SOA and the second output pin SOB of the linear constant current drive chip 1 The same voltage signal or logic signal is output correspondingly.
  • the first peripheral end EXTA and the second peripheral end EXTB of the peripheral circuit 2 respectively set a set of electrical signals on the first input pin SIA and the second input pin SIB of the first linear constant current driving chip 1.
  • the first current conversion circuit IA and the second current conversion circuit IB are controlled to generate a set of currents to drive the first LED array 31 and the second LED.
  • the array 32 is output to the first output pin SOA and the second output pin SOB via the first output buffer circuit BOA and the second output buffer circuit BOB, respectively.
  • the first output pin SOA and the second output pin SOB of the linear constant current drive chip 1 set a set of electrical signals on the input terminals SIA and SIB of the next linear constant current drive chip 2, and so on, so that three linear
  • the first current terminal pin IOA and the second current terminal pin IOB of the constant current driving chip 1 each generate a set of electrical signals to drive the first LED array 31 and the second LED array 32.
  • the multi-chip parallel LED lighting driving circuit of this embodiment only needs one set of peripheral circuits 2 and can drive the first LED array 31 and the second LED array 32 at the same time, which reduces the cost and simplifies the structure.
  • the peripheral circuit 2 in the present invention may be partially or fully integrated into one or more linear constant current driving chips, so that one or more linear constant current driving chips and other linear constant current driving chips are integrated. It's different, but it achieves the same technical effect.

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Abstract

本发明公开了一种线性恒流驱动芯片及多芯片并联LED照明驱动电路，涉及LED照明驱动电路，多芯片并联LED照明驱动电路包括供电单元、LED阵列、外围电路、线性恒流驱动芯片；线性恒流驱动芯片具有电流端引脚、输入引脚及输出号引脚；线性恒流驱动芯片的输入引脚依次连接上一个线性恒流驱动芯片的输出引脚，且第一个线性恒流驱动芯片的输入引脚连接外围电路；本发明多芯片并联LED照明驱动电路只需要一套各种外围电路，简化了结构，节省了成本，由第一个线性恒流芯片检测外围电路信号，并将信号送至所有的线性恒流芯片，控制所有的线性恒流芯片内的自电源转换单元同步控制流经LED阵列的电流。

Description

一种线性恒流驱动芯片及多芯片并联LED照明驱动电路
本申请要求申请日为2018年7月31日的中国专利申请CN201810857123.5的优先权。本申请引用上述中国专利申请的全文。
技术领域
本发明涉及LED照明驱动电路，具体为一种线性恒流驱动芯片及多芯片并联LED照明驱动电路。
背景技术
线性恒流LED照明驱动电路中通常会用到芯片和外围电路。芯片包括控制电路和电流源；外围电路多种多样，常见的如：电流设定电路、环路补偿电路、滤波电路、检测电路和异常保护电路等。当前，在功率较大的应用中，往往需要多个芯片并联以扩展功率和分担功耗，相应地，多组芯片对应的外围电路也需要一起使用，这导致外围电路非常复杂。
图1是现有的3个芯片并联的LED照明驱动电路，包括供电单元、LED阵列、3个芯片、及3个外围电路。每个芯片均包括1个控制电路和1个电流源，控制电路的一端连接电流源的一端，控制电路的另一端连接输入引脚MI，电流源的另一端连接电流端引脚MOUT。3个外围电路分别连接3个芯片的输入引脚MI，3个芯片的电流端引脚MOUT均连接LED阵列的同一端，LED阵列的另一端连接供电单元。
现有的多芯片并联LED照明驱动电路中，每个芯片均需要连接对应的外围电路，使的电路器件多，电路连接复杂。
发明内容
本发明的目的在于提供一种线性恒流驱动芯片及多芯片并联LED照明 驱动电路，以解决上述背景技术中提出的问题。
为实现上述目的，本发明提供如下技术方案:一种线性恒流驱动芯片，具有电流端引脚、输入引脚及输出引脚；所述线性恒流驱动芯片包括电源转换单元，所述电源转换单元通过所述电流端引脚控制流经LED阵列的电流；所述输入引脚用以检测各类外部信号并使之反应到所述输出引脚，所述输出引脚的状态受到所述输入引脚控制。
进一步的，所述线性恒流驱动芯片还包括输入缓冲电路及输出缓冲电路；所述输出缓冲电路的输出端连接所述输出引脚，所述输入缓冲电路的输出端连接所述输出缓冲电路的输入端，所述输入缓冲电路的输入端连接所述输入引脚:所述电流转换电路的输出端连接所述电流端引脚，输入端连接所述输入缓冲电路的输出端。
进一步的，若所述输入引脚用于接收电流信号，则所述输出引脚产生数值相等的电流信号。
进一步的，若所述输入引脚用于接收电压信号，则所述输出引脚产生数值相等的电压信号。
进一步的，若所述输入引脚用于接收逻辑信号，则所述输出引脚产生相同的逻辑信号。
本发明还提出了一种多芯片并联LED照明驱动电路，包括外围电路、供电单元、LED阵列、及若干个如权利要求1中所述的线性恒流驱动芯片；所述外围电路连接其中一个所述线性恒流驱动芯片的输入引脚，所述线性恒流驱动芯片的输出引脚依次与下一个所述线性
恒流驱动芯片的输入引脚相连，且最后一个所述线性恒流驱动芯片的输出引脚空置:所述
LED阵列的一端连接供电单元，另一端分别连接所述线性恒流驱动芯片的电流端引脚。
进一步的，由第一个所述线性恒流驱动芯片的所述输入引脚检测所述外 围电路的
外围端信号，并将信号送至所有的所述线性恒流芯片，控制所有的所述线性恒流芯片内的所述电源转换单元同步控制流经所述LED阵列的电流。
进一步的，所述线性恒流驱动芯片具有至少1个所述输入引脚；所述线性恒流驱动芯片的输出引脚分别依次与下一个所述线性恒流驱动芯片上对应的输入引脚相连。
进一步的所述外围电路部分或者全部集成到任意一或多个所述线性恒流驱动芯片内部。
与现有技术相比，本发明的有益效果是：本发明多芯片并联LED照明驱动电路只需要一套各种外围电路，降低了成本，简化了结构。
附图说明
图1是现有的多芯片并联LED照明驱动电路的结构示意图；
图2是本发明多芯片并联LED照明驱动电路实施例一的结构示意图；
图3是本发明多芯片并联LED照明驱动电路实施例二的结构示意图；
附图标记中:：1、线性恒流驱动芯片；2、外围电路；21、控制电路；22、检测电路；3、LED阵列；31、第一LED阵列；32、第二LED阵列；4、供电单元。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
实施例1
如图2所示，本实施例多芯片并联LED照明驱动电路包括外围电路2、 LED阵列3、供电单元4及三个线性恒流驱动芯片1。
供电单元4连接LED阵列3的一端。
外围电路2具有外围端lSEXT，包括电流源lIR及电阻1R。电流源lIR负极接地，正极连接外围端lSEXT及电阻1R的另一端。电阻1R的另一端连接LED阵列3不与供电单元4相连的一端，用来检测供电单元4的电压幅值。电流源lIR和电阻1R构成了一个受市电电压幅值影响的电流基准，该电流基准经外围端lSEXT输出，当市电升高时，该电流基准电流减小，当市电降低时，该电流基准电流增大。
线性恒流驱动芯片1具有一个输入引脚SI、一个输出引脚SO及一个电流端引脚IO，包括输入缓冲电路IA、输出缓冲电路IB及电流转换电路IC。输入缓冲电路IA、输出缓冲电路IB及电流转换电路IC均为电流源。输入缓冲电路IA的负极连接输入引脚SI；输出缓冲电路IB的负极接地，正极连接输出引脚SO；电流转换电路IC的负极接地，正极连接电流端引脚IO。输入缓冲电路IA和输出缓冲电路IB构成了一个电流镜；输入缓冲电路IA和电流转换电路IC构成了另一个电流镜。若线性恒流驱动芯片1的输入引脚SI的有效输入信号为下拉电流，输出引脚SO的输出信号也是下拉电流，且与输入引脚SI的下拉电流幅值相等。
线性恒流驱动芯片1依次排列，每个线性恒流驱动芯片1的输入引脚SI依次与上一个线性恒流驱动芯片1的输出引脚SO连接，且第一个线性恒流驱动芯片1的输入引脚SI连接外围电路2的外围端lSEXT，最后一个线性恒流驱动芯片1的输出引脚SO空置。线性恒流驱动芯片1的电流端引脚IO均连接LED阵列3不与供电单元4相连的一端。
本实施例的工作原理如下：
外围电路2的外围端lSEXT在第一个线性恒流驱动芯片1的输入引脚SI设定电信号，该电信号一方面经输入缓冲电路IA和电流转换电路IC产生设定电流驱动LED阵列3，另一方面经输出缓冲电路IB输出至输出引脚SO。 线性恒流驱动芯片1的输出引脚SO在下一个线性恒流驱动芯片1的输入引脚SI设定电信号，以此类推，使三个线性恒流驱动芯片1的电流端引脚IO均产生设定电流驱动LED阵列3。
本实施例多芯片并联LED照明驱动电路只需要一套外围电路2，降低了成本的同时简化了结构。且本发明多芯片并联LED照明驱动电路中的线性恒流驱动芯片依次连接，结构简单便于走线，且芯片外部电路连线不交叉，提高了电路的稳定性。
实施例2
如图3所示，本实施例多芯片并联LED照明驱动电路包括外围电路2、LED阵列3、供电单元4及三个线性恒流驱动芯片1。LED阵列包括第一LED阵列31及第二LED阵列32。第一LED阵列31及第二LED阵列32分别为暖白和冷白两种色温。
供电单元4的输出端连接第一LED阵列31及第二LED阵列32的一端。
外围电路2具有第一外围端EXTA及第二外围端EXTB，包括一个控制电路21及一个检测电路22。检测电路22一端连接控制电路21，另一端连接供电单元4，检测供电单元的开关状态，该状态经控制电路处理后馈送至外围端EXTA和EXTB，分别作为LEDA和LEDB的亮度控制信号。控制电路的两个输出端分别连接第一外围端EXTA及第二外围端EXTB。
线性恒流驱动芯片1具有第一输入引脚SIA、第二输入引脚SIB、第一输出引脚SOA、第二输出引脚SOB、第一电流端引脚IOA及第二电流端引脚IOB，包括第一输入缓冲电路BIA、第二输入缓冲电路BIB、第一输出缓冲电路BOA、第二输出缓冲电路BOB、第一电流转换电路IA及第二电流转换电路IB。第一输入缓冲电路BIA、第二输入缓冲电路BIB、第一输出缓冲电路BOA、第二输出缓冲电路BOB均为电压跟随器或者逻辑跟随器，该电压 跟随器或者逻辑跟随器能够使跟随器的输出端复制输入端的电压信号或者逻辑信号；第一输入缓冲电路BIA的输入端连接第一输入引脚SIA，输出端连接第一输出缓冲电路BOA的输入端；第二输入缓冲电路BIB的输入端连接第二输入引脚SIB，输出端连接第二输出缓冲电路BOB的输入端；第一输出缓冲电路BOA的输出端连接第一输出引脚SOA；第二输出缓冲电路BOB的输出端连接第二输出引脚SOB。第一电流转换电路IA及第二电流转换电路IB均为可调节带有控制端的恒流源；第一电流转换电路IA的正极连接第一电流端引脚IOA，负极接地，控制端连接第一输入缓冲电路BIA的输出端；第二电流转换电路IB的正极连接第二电流端引脚IOB，负极接地，控制端连接第二输入缓冲电路BIB的输出端。
线性恒流驱动芯片1依次排列，每个线性恒流驱动芯片1的第一输入引脚SIA依次与上一个线性恒流驱动芯片1的第一输出引脚SOA连接，第二输入引脚SIB依次与上一个线性恒流驱动芯片1的第二输出引脚SOB连接；且第一个线性恒流驱动芯片1的第一输入引脚SIA连接外围电路2的第一外围端EXTA，第二输入引脚S1B连接外围电路2的第二外围端EXTB；最后一个线性恒流驱动芯片1的第一输出引脚SOA及第二输出引脚SOB空置。三个线性恒流驱动芯片1的第一电流端引脚IOA均连接第一LED阵列31不与供电单元4相连的一端，第二电流端引脚IOA均连接第二LED阵列32不与供电单元4相连的一端。
线性恒流驱动芯片1第一输入引脚SIA、第二输入引脚SIB接收的信号为电压信号或逻辑信号，使线性恒流驱动芯片1的第一输出引脚SOA、第二输出引脚SOB分别对应地输出相同的电压信号或逻辑信号。
本实施例的工作原理如下:
外围电路2的第一外围端EXTA及第二外围端EXTB分别在第一个线性恒流驱动芯片1的第一输入引脚SIA及第二输入引脚SIB上设定一组电信号，该电信号分别经第一输入缓冲电路BIA及第二输入缓冲电路BIB后， 一方面控制第一电流转换电路IA、第二电流转换电路IB产生一组设定电流驱动第一LED阵列31及第二LED阵列32，另一方面分别经第一输出缓冲电路BOA及第二输出缓冲电路BOB输出至第一输出引脚SOA及第二输出引脚SOB。线性恒流驱动芯片1的第一输出引脚SOA及第二输出引脚SOB在下一个线性恒流驱动芯片2的输入端SIA，SIB上设定一组电信号，以此类推，使3个线性恒流驱动芯片1的第一电流端引脚IOA及第二电流端引脚IOB均产生一组电信号驱动第一LED阵列31及第二LED阵列32。
本实施例多芯片并联LED照明驱动电路只需要一套外围电路2，能够同时驱动第一LED阵列31及第二LED阵列32，降低了成本的同时简化了结构。
根据不同的技术人员的设计思路，本发明中的外围电路2可以部分或者全部集成到一个或者多个线性恒流驱动芯片内部，使一个或者多个线性恒流驱动芯片与其他线性恒流驱动芯片有所不同，但实现相同的技术效果。
尽管已经示出和描述了本发明的实施例，对于本领域的普通技术人员而言，可以理解在不脱离本发明的原理和精神的情况下可以对这些实施例进行多种变化、修改、替换和变型，本发明的范围由所附权利要求及其等同物限定。

Claims (9)

  1. 一种线性恒流驱动芯片，其特征在于：具有电流端引脚、输入引脚及输出引脚；所述线性恒流驱动芯片包括电源转换单元，所述电源转换单元通过所述电流端引脚控制流经LED阵列的电流；所述输入引脚用以检测各类外部信号并使之反应到所述输出引脚，所述输出引脚的状态受到所述输入引脚控制。
  2. 根据权利要求1所述的一种线性恒流驱动芯片，其特征在于：所述线性恒流驱动芯片还包括输入缓冲电路及输出缓冲电路；所述输出缓冲电路的输出端连接所述输出引脚，所述输入缓冲电路的输出端连接所述输出缓冲电路的输入端，所述输入缓冲电路的输入端连接所述输入引脚；所述电流转换电路的输出端连接所述电流端引脚，输入端连接所述输入缓冲电路的输出端。
  3. 根据权利要求1所述的一种线性恒流驱动芯片，其特征在于：若所述输入引脚用于接收电流信号，则所述输出引脚产生数值相等的电流信号。
  4. 根据权利要求1所述的一种线性恒流驱动芯片，其特征在于：若所述输入引脚用于接收电压信号，则所述输出引脚产生数值相等的电压信号。
  5. 根据权利要求1所述的一种线性恒流驱动芯片，其特征在于:若所述输入引脚用于接收逻辑信号，则所述输出引脚产生相同的逻辑信号。
  6. 一种多芯片并联LED照明驱动电路，其特征在于：包括外围电路、供电单元、LED阵列、及若干个如权利要求1中所述的线性恒流驱动芯片；所述外围电路连接其中一个所述线性恒流驱动芯片的输入引脚，所述线性恒流驱动芯片的输出引脚依次与下一个所述线性恒流驱动芯片的输入引脚相连，且最后一个所述线性恒流驱动芯片的输出引脚空置；所述LED阵列的一端连接供电单元，另一端分别连接所述线性恒流驱动芯片的电流端引脚。
  7. 根据权利要求6所述的一种多芯片并联LED照明驱动电路，其特征 在于：由第一个所述线性恒流驱动芯片的所述输入引脚检测所述外围电路的外围端信号，并将信号送至所有的所述线性恒流芯片，控制所有的所述线性恒流芯片内的所述电源转换单元同步控制流经所述LED阵列的电流。
  8. 根据权利要求6所述的一种多芯片并联LED照明驱动电路，其特征在于：所述线性恒流驱动芯片具有至少1个所述输入引脚；所述线性恒流驱动芯片的输出引脚分别依次与下一个所述线性恒流驱动芯片上对应的输入引脚相连。
  9. 根据权利要求6所述的一种多芯片并联LED照明驱动电路，其特征在于：所述外围电路部分或者全部集成到任意一或多个所述线性恒流驱动芯片内部。
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