CN102938952A - Current setting circuit of a plurality of light-emitting diode (LED) strings and method thereof - Google Patents

Current setting circuit of a plurality of light-emitting diode (LED) strings and method thereof Download PDF

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CN102938952A
CN102938952A CN 201210249900 CN201210249900A CN102938952A CN 102938952 A CN102938952 A CN 102938952A CN 201210249900 CN201210249900 CN 201210249900 CN 201210249900 A CN201210249900 A CN 201210249900A CN 102938952 A CN102938952 A CN 102938952A
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current
led
circuit
mirror
communication
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CN 201210249900
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Chinese (zh)
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司徒道明
吴允栋
孙建波
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上海新进半导体制造有限公司
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00Energy efficient lighting technologies
    • Y02B20/40Control techniques providing energy savings
    • Y02B20/42Control techniques providing energy savings based on timing means or schedule

Abstract

The invention discloses a current setting circuit of a plurality of light-emitting diode (LED) strings and a method thereof. The circuit comprises a current generation circuit, a current mirror with a plurality of output ends and used for receiving current generated by the current generation circuit and a selection switching module. The selection switching module conducts one-to-one communication between the output ends of the current mirror and the LED strings and switches the one-to-one communication in non-repeated mode to enable each LED string to conduct one-to-one communication with the output ends of the current mirror in set time. The circuit can achieve the effect that the LED string have identical current and further achieves even brightness of an LED lamp.

Description

—种多个LED串的电流设定电路及方法 - a plurality of kinds of LED strings current setting circuit and method

技术领域 FIELD

[0001] 本发明涉及LED灯亮度的控制技术领域,更具体地说,涉及一种多个LED串的电流设定电路及方法。 [0001] Technical Field The present invention relates to controlling the brightness of the LED lamp, and more particularly, relates to an LED strings of the plurality of current setting circuit and method.

背景技术 Background technique

[0002]目前,随着半导体技术的不断发展,LED灯的应用范围也越来越广。 [0002] At present, with the continuous development of semiconductor technology, the scope of application of LED lights more widely. 通常每个LED灯由多个LED串并联组成,各个LED串分别与电流镜的其中一个输出端相连,以获得驱动电流。 Typically, each LED lamp by a plurality of LED strings connected in parallel, each LED string, respectively, and wherein a current mirror connected to the output terminal, to obtain a drive current. [0003] 但是,由于半导体工艺存在漂移,电流镜各个输出端的半导体器件将会存在失配。 [0003] However, due to the presence of a drift semiconductor process, the semiconductor device of the respective outputs of the current mirror there will be a mismatch. 因此,电流镜各个输出端的电流将会不相同,与电流镜各个输出端相连的各个LED串通道之间获得的电流也不相同。 Thus, the current output of each current mirror will not be the same, the current is obtained between the respective channel and the respective LED collude output of the current mirror is connected is not the same.

[0004] 由于LED串各个通道获得的电流各不相同,因此会造成各个LED灯的亮度不均匀。 [0004] Since the current through all LED strings obtained vary, thus causing uneven brightness of each LED lamp. 发明内容 SUMMARY

[0005] 有鉴于此,本发明提供一种多个LED串的电流设定电路及方法,以实现各个LED串获得的驱动电流相同,进而实现LED灯的亮度均匀。 [0005] Accordingly, the present invention provides an LED strings plurality of current setting circuit and method to achieve the same driving current of the LED strings obtained, thus achieving uniform brightness of the LED lamp.

[0006] 为解决上述技术问题,本发明采用的技术方案为:一种多个LED串的电流设定电路,包括:电流产生电路、具有多个输出端并且接收所述电流产生电路产生电流的电流镜、以及选择切换模块;其中: [0006] To solve the above problems, the present invention adopts the technical solution as follows: one of a plurality of LED strings current setting circuit, comprising: a current generating circuit, having a plurality of outputs and receiving the current generating circuit generates a current a current mirror, and a selection switch module; wherein:

[0007] 所述选择切换模块在所述电流镜的输出端与LED串之间进行一对一连通,并且在设定时间内将所述一对一连通进行不重复的切换,使得在该设定时间内每个LED串与电流镜的所有输出端都进行过一对一连通。 [0007] The switching module select one to one communication between the output terminal of the current mirror with the LED string, and the set time of said one non-repeated switching of communication, provided that the All given time each LED string and an output terminal of the current mirror have been one communication.

[0008] 优选地,所述选择切换模块包括控制电路和多个多路选择器: [0008] Preferably, the selection control circuit and a switching module comprises a plurality of multiplexers:

[0009] 所述控制电路用于生成实时控制信号,并将所述实时控制信号发送至每个与所述控制电路相连的多路选择器; [0009] The control circuit for generating a control signal in real time, and the real-time control signals to each multiplexer connected to the control circuit;

[0010] 每个所述多路选择器具有与电流镜输出端数量相同的输入端且两者一对一连通;同时各多路选择器之间,每个输入端与电流镜输出端之间的一对一连接都不相同。 [0010] each of said multiplexer output terminal of the current mirror having the same number of input terminals and one of both communication; selector simultaneously between each input terminal and the output terminal of the current mirror each multiplexer one to one connections are not the same.

[0011] 优选地,所述控制电路包括脉冲发生器和计数器;其中: [0011] Preferably, the control circuit comprises a pulse generator and a counter; wherein:

[0012] 所述计数器的输入端与所述脉冲发生器相连,输出端与所述多路选择器相连,用于对所述脉冲发生器产生的时钟脉冲进行计数,并根据所计数目输出所述控制信号。 [0012] The input of the counter and the pulse generator is connected to the output terminal of said multiplexer, a clock pulse to the pulse generator is counted, and the counted number of outputs in accordance with the said control signal.

[0013] 优选地,所述电路还包括连接于所述选择切换模块与LED串之间的电流倍增电路。 [0013] Preferably, the circuit further comprises a switch connected between the current module and the LED string selection multiplier circuit.

[0014] 优选地,所述在设定时间内将所述一对一连通进行不重复的切换是按照设定频率进行的。 [0014] Preferably, the said one communication within a set time for switching is not repeated in accordance with the set frequency.

[0015] 优选地,所述设定频率是快于人眼做出判断的频率。 [0015] Preferably, the set is a frequency faster than the human eye to make judgment.

[0016] 一种多个LED串的电流设定方法,用于多个LED串的电流设定电路中,所述电流设定电路至少包括电流产生电路,以及具有多个输出端并且接收所述电流产生电路产生电流的电流镜,其中电流镜的输出端数量与LED串数量相同,该方法包括: [0016] An LED current setting method of a plurality of strings, the current setting circuit for multiple LED strings, the current setting circuit comprises at least a current generating circuit, and a plurality of outputs and receiving the current generation circuit generates a current mirror current, wherein the same number of output terminals of the current mirror with the LED string, the method comprising:

[0017] 将LED串与电流镜的输出端进行一对一连通,并且在设定时间内将所述一对一连通进行不重复的切换,使得在该设定时间内每个LED串与电流镜的所有输出端都进行过一对一连通; [0017] The output terminal of the current mirror LED string communicates one to one, and within a set time of said one non-repeated switching of communication, so that the current in each LED string within the set time all outputs have been mirror-one communication;

[0018] 重复所述设定时间内LED串与电流镜输出端的一对一的切换连通。 [0018] repeating the communication setting switching time one LED string and the current mirror output.

[0019] 优选地,所述方法还包括将电流镜的输出电流进行倍增后传送至LED串。 [0019] Preferably, the method further comprising transmitting to the LED string is output current of the current mirror is doubled. [0020] 优选地,所述在设定时间内将所述一对一连通进行不重复的切换是按照设定频率进行的。 [0020] Preferably, the said one communication within a set time for switching is not repeated in accordance with the set frequency.

[0021] 优选地,所述设定频率是快于人眼做出判断的频率。 [0021] Preferably, the set is a frequency faster than the human eye to make judgment.

[0022] 从上述的技术方案可以看出,本发明公开的一种多个LED串的电流设定电路及方法,通过选择切换模块在电流镜的输出端与LED串之间进行一对一连通,并且在设定时间内将所述一对一连通进行不重复的切换,使得在该设定时间内每个LED串与电流镜的所有输出端都进行过一对一连通,实现了每个LED串在设定的时间内获得的电流均为电流镜所有输出端电流的平均值,进而实现了由多个LED串组成的LED灯的亮度均匀。 [0022] As can be seen from the above technical solution, an LED strings of the plurality of current invention disclosure setting circuit and method, one to one communication between the output terminal of the current mirror through the LED string selection switching module and the one non-repeated switching of communication within a set time, such that within the set time for each LED string and all the outputs of the current mirror have been one communication, each realized current of the LED strings obtained within the set times are the average of all of the current output of the current mirror, thereby achieving uniform brightness of multiple LED strings of the LED lamp.

附图说明 BRIEF DESCRIPTION

[0023] 为了更清楚地说明本发明实施例或现有技术中的技术方案,下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍,显而易见地,下面描述中的附图仅仅是本发明的一些实施例,对于本领域普通技术人员来讲,在不付出创造性劳动的前提下,还可以根据这些附图获得其他的附图。 [0023] In order to more clearly illustrate the technical solutions in the embodiments or the prior art embodiment of the present invention, briefly introduced hereinafter, embodiments are described below in the accompanying drawings or described in the prior art needed to be used in describing the embodiments the drawings are only some embodiments of the present invention, those of ordinary skill in the art is concerned, without creative efforts, can derive from these drawings other drawings.

[0024] 图I为本发明实施例公开的一种多个LED串的电流设定电路的结构示意图; Structure of the current one of a plurality of LED strings to the disclosed embodiments [0024] Figure I is a schematic view of the present disclosure setting circuit;

[0025] 图2为本发明另一实施例公开的一种多个LED串的电流设定电路的结构示意图; [0025] FIG. 2 is a structural diagram of a current one of a plurality of LED strings according to another disclosed embodiment of the invention the setting circuit;

[0026] 图3为本发明公开的一种多个LED串的电流设定方法的流程图; [0026] Figure 3 discloses a flow chart of a method of setting the current of a plurality of LED strings of the present invention;

[0027] 图4为现有技术公开的一种16个LED串的电流设定电路的电路图; [0027] FIG 4 is a prior art disclosed a circuit diagram of a LED string 16 current setting circuit;

[0028] 图5为本发明另一实施例公开的一种16个LED串的电流设定电路的电路图; [0028] Figure 5 a circuit diagram of a 16-LED strings of the current setting circuit according to another embodiment of the disclosed invention;

[0029] 图6为本发明公开的16路多路选择器的一种实现电路图。 [0029] FIG. 6 a 16-channel multiplexer circuit diagram of the implementation of the present invention is disclosed.

具体实施方式 detailed description

[0030] 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的一部分实施例,而不是全部的实施例。 [0030] below in conjunction with the present invention in the accompanying drawings, technical solutions in the embodiments will be apparent to the present invention, completely described, obviously, the described embodiments are merely part of embodiments of the present invention, but not all Example. 基于本发明中的实施例,本领域普通技术人员在没有作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。 Based on the embodiments of the present invention, those of ordinary skill in the art to make all other embodiments without creative work obtained by, it falls within the scope of the present invention.

[0031] 本发明实施例公开了一种多个LED串的电流设定电路及方法,以实现各个LED串获得的驱动电流相同,进而实现LED灯的亮度均匀。 Current embodiment [0031] The present invention discloses a plurality of strings of an LED setting circuit and method to achieve the same driving current of the LED strings obtained, thus achieving uniform brightness of the LED lamp.

[0032] 如图I所示,一种多个LED串的电流设定电路,包括:电流产生电路11、具有多个输出端并且接收所述电流产生电路产生电流的电流镜12、以及选择切换模块13 ;其中: [0032] As shown in FIG I, a plurality of strings of an LED current setting circuit, comprising: a current generating circuit 11, having a plurality of outputs and receiving the current generating circuit 12 generates a current of a current mirror, and a selection switch module 13; wherein:

[0033] 选择切换模块13在电流镜12的输出端与LED串之间进行一对一连通,并且在设定时间内将所述一对一连通进行不重复的切换,使得在该设定时间内每个LED串与电流镜12的所有输出端都进行过一对一连通。 [0033] The switching module 13 for selecting one communication between the output terminal of the current mirror 12 of the LED string, and the set time of said one non-repeated switching of communication, so that the setting time each LED string and all the outputs of the current mirror 12 have been one communication.

[0034] 具体的,在设定时间内将所述一对一连通进行不重复的切换是按照快于人眼做出判断的频率进行的。 [0034] Specifically, the set time for the communication do not overlap one switching is performed at a frequency faster than the human eye to make judgment.

[0035] 具体的,选择切换模块13包括控制电路和多路选择器; [0035] Specifically, the selection switching module includes a control circuit 13 and a multiplexer;

[0036] 控制电路用于生成实时控制信号,并将所述实时控制信号发送至每个与所述控制电路相连的多路选择器; [0036] The control circuit for generating a control signal in real time, and the real-time control signals to each multiplexer connected to the control circuit;

[0037] 每个多路选择器具有与电流镜12输出端数量相同的输入端且两者一对一连通;同时各多路选择器之间,每个输入端与电流镜12输出端之间的一对一连接都不相同。 [0037] Each multiplexer has a number of current mirror 12 the output of both the same and one input terminal of communication; selector simultaneously between each input terminal and the output terminal of the current mirror 12 of each multiplexer one to one connections are not the same.

[0038] 具体的,控制电路包括脉冲发生器和计数器;其中: [0038] Specifically, the control circuit includes a pulse generator and counter; wherein:

[0039] 计数器的输入端与脉冲发生器相连,输出端与多路选择器相连,用于对脉冲发生器产生的时钟脉冲进行计数,并根据所计数目输出控制信号。 [0039] An input terminal of the counter pulse generator connected to the output terminal of the multiplexer, a clock pulse generator for counting the pulses, and outputs a control signal according to the number counted.

[0040] 在上述实施例中,通过选择切换模块13在电流镜12的输出端与LED串之间进行一对一连通,并且在设定时间内将所述一对一连通进行不重复的切换,使得在该设定时间内每个LED串与电流镜的所有输出端都进行过一对一连通,实现了每个LED串在设定的时间内获得的电流均为电流镜所有输出端电流的平均值,进而实现了由多个LED串组成的LED灯的亮度均匀。 [0040] In the above embodiment, the switching module 13 is performed by selecting between the output terminal of the current mirror of one of the LED strings 12 communicates, and said one non-repeated switching of communication within a set time such that within the set time for each LED string and all the outputs of the current mirror have been one communication, to achieve the current in each LED string obtained in the set time all outputs are current mirror current the average value, and thus achieving uniform brightness of multiple LED strings of the LED lamp.

[0041] 本发明的另一实施例还公开了一种多个LED串的电流设定电路,如图2所示,包括: [0041] Another embodiment of the present invention also discloses a plurality of strings of an LED current setting circuit, shown in Figure 2, comprising:

[0042] 电流产生电路21、具有多个输出端并且接收所述电流产生电路产生电流的电流镜22、选择切换模块23、以及电流倍增电路24 ;其中: [0042] The current generating circuit 21, having a plurality of outputs and receiving the current generating circuit 22 generates a current in the current mirror, the selection switching module 23, and a current multiplying circuit 24; wherein:

[0043] 选择切换模块23在电流镜22的输出端与LED串之间进行一对一连通,并且在设定时间内将所述一对一连通进行不重复的切换,使得在该设定时间内每个LED串与电流镜22的所有输出端都进行过一对一连通; [0043] The switching module 23 for selecting one communication between the output of current mirror 22 and the LED array, and the set time of said one non-repeated switching of communication, so that the setting time each LED string and all the outputs of the current mirror 22 have been in communication one;

[0044] 电流倍增电路24连接于选择切换模块23与LED串之间,用于将电流镜22输出端的电流倍增后提供给LED串。 [0044] The current multiplying circuit 24 is connected to a selection switch module 23 and the LED strings, for the current output of current mirror 22 to the LED string is multiplied.

[0045] 如图3所示,一种多个LED串的电流设定方法,包括: [0045] As shown, a current-setting method of a plurality of LED strings 3, comprising:

[0046] SlOlj^LED串与电流镜的输出端进行一对一连通,并且在设定时间内将所述一对一连通进行不重复的切换,使得在该设定时间内每个LED串与所有电流镜的所有输出端都进行过一对一连通; [0046] SlOlj ^ LED string output of the current mirror of one to one communication, and the set time of said one non-repeated switching of communication, so that each LED string within the set time and All outputs of all of the current mirror have been one of the communication;

[0047] S102、重复所述设定时间内LED串与电流镜输出端的一对一的切换连通。 [0047] S102, the setting is repeated one time within the LED string switching communication with the current mirror output.

[0048] 具体的,还可以将电流镜的输出电流进行倍增后传送至LED串; [0048] Specifically, the output may also be current mirror will be transmitted to the multiplier LED string;

[0049] 在设定时间内将所述一对一连通进行不重复的切换是按照快于人眼做出判断的频率进行的。 [0049] within a set time communicating said one non-repeated switching is performed at a frequency faster than the human eye to make judgment.

[0050] 为了能够更加清楚的说明本发明公开的LED灯电流设定电路及方法,下面结合现有技术中16个LED灯串电流设定的电路图和本发明公开的16个LED串的电流设定的电路图进行详细描述。 [0050] In order to more clearly illustrate the present invention, an LED lamp current setting circuit and method disclosed below in connection with the prior art LED string 16 a circuit diagram and a current set of the present invention disclosed in the current LED string 16 is provided given a circuit diagram described in detail.

[0051] 如图4所示,为现有技术中16个LED串的电流设定的电路图,通过将16个LED串分别连接在电流镜的其中一个输出端上,以获得该输出端的电流。 [0051] As shown in FIG 4, it is a circuit diagram of a prior art LED string 16 to set the current through the LED string 16 which are connected to the output of a current mirror to obtain the current output terminal.

[0052] 电流镜输出端的电流由下式给出: [0052] The output terminal of the current mirror is given by:

Figure CN102938952AD00061

[0055]其中: [0055] wherein:

Figure CN102938952AD00062

为运放cpl的等效输入失调; Op amp equivalent input offset of cpl;

[0058] ε 2为电流镜中MOS管尺寸失配及沟道调制效应引起的误差百分比; [0058] ε 2 as a percentage of the size mismatch error MOS transistor and the channel modulation effect caused by the current mirror;

Figure CN102938952AD00063

; Vosi为运放opi的等效输入失调,i=l, 2......16 ; ; Opi VOSI op amp equivalent input offset, i = l, 2 ...... 16;

[0060] 4为电阻失配造成的误差。 [0060] 4 is the resistance of the mismatch errors.

[0061] 由于在现有技术中可通过斩波技术来降低运算放大器的失调,使得ε I和ε 3保持在O. 5%以下,在现有的半导体工艺中可使ε保持在O. 5%以下,因此电流镜输出端的电流可为: [0061] Since in the prior art the offset of the operational amplifier can be reduced by the chopper technique, such that ε I and ε 3 is maintained at O. 5% or less, can remain in O. 5 [epsilon] In the conventional semiconductor process % or less, and therefore the output of the current mirror may be:

Figure CN102938952AD00064

[0063] 由此可见,电流镜输出端的电流误差主要由电流镜中MOS管尺寸失配及沟道调制效应引起的误差百分比ε2造成。 [0063] Thus, the percentage of error ε2 current mirror output terminal of the current error is mainly caused by the size of current mirror MOS transistor and the channel modulation effect mismatch caused.

[0064] 为了解决由于电流镜中MOS管尺寸失配及沟道调制效应引起的电流镜各个输出端的电流误差,本发明另一实施例公开了16个LED串的电流设定电路的电路图。 [0064] In order to solve the current error due to the respective output terminal of the current mirror MOS transistor due to the size mismatch and the channel modulation effect of the current mirror, a further embodiment of the present invention discloses a circuit diagram of a LED string 16 current setting circuit.

[0065] 如图5所示,通过计数器的输入端与脉冲发生器的输出端相连,输出端与各个16路多路选择器相连,每个计数器与16路多路选择器的的实现方式如图6所示;如图5所示,第一个多路选择器的第一个输入与电流镜的第一个输出端连接,该多路选择器的第二个输入与电流镜的第二个输出端连接,依次下去,该多路选择器的第16个输入端与电流镜的第16个输出端连接;第二个多路选择器的第一个输入端与电流镜的第二个输出端连接,该多路选择器的第二个输入端与电流镜的第三个输出端连接,依次下去,该多路选择器的第16个输入端与电流镜的第一个输出端连接。 [0065] As shown in FIG. 5, an input terminal connected to an output terminal by the pulse generator and the counter, connected to the output terminal of each multiplexer 16, 16 with each counter multiplexer implementation of such As shown in FIG. 6; FIG., the first input terminal of a first current mirror output the first multiplexer 5 is connected, the second multiplexer and a second input of the current mirror output terminal is connected sequentially down, the multiplexer 16 outputs the first input terminal 16 of the current mirror is connected; second second multiplexer a first input terminal of the current mirror an output terminal connected to a third output terminal of the second multiplexer input of the current mirror is connected, in turn continues, the multiplexer output terminal of the first input terminal 16 is connected to the current mirror . 按照这样的规律:各多路选择器之间,每个输入端与电流镜输出端之间的一对一连接都不相同。 According to this rule: between the multiplexer, one connected between each input terminal and the output terminal of the current mirror is not the same.

[0066] 当然,在其他实施例中,也可以是每个多路选择器与电流镜的输出端连接方式都一样,即都是:第一个多路选择器的第一个输入与电流镜的第一个输出端连接,该多路选择器的第二个输入与电流镜的第二个输出端连接,依次下去;第二个也是这样。 [0066] Of course, in other embodiments, may be selected for each multiplexer and the output terminal of the current mirror connections are the same, i.e. are: a first multiplexer a first input of the current mirror a first output terminal connected to a second output terminal of the multiplexer and a second input connected to a current mirror, turn down; the second well. 而“在设定时间内将所述一对一连通进行不重复的切换,使得在该设定时间内每个LED串与所有电流镜的输出端都进行过一对一连通”,则依靠控制这些多路选择器输出的控制信号完成,只要这些多路选择器输入能够实现上述功能的控制信号即可。 The "set time communicating said one non-repeated switching, such that within the set time of each LED string with all the outputs of the current mirror have been one communication", the control relied the multiplexer control signal output of the selector is completed, as long as the control signal input multiplexer can realize the above functions.

[0067] 计数器在一个周期内对脉冲发生器所产生的时钟脉冲进行计数,并根据所计数目生成16次不同的控制信号,每次不同的控制信号控制16路多路选择器接通电流镜的其中一个输出端,计数器的输出和16路选择器的输出之间的关系如表I所不; [0067] counter in a cycle of the clock pulses generated by the pulse generator counted, and generates a different control signal 16 according to the counted number each time a different control signal multiplexer 16 is switched on current mirror wherein an output, relationship between the output and the output of the counter selector 16 are not shown in table I;

[0068] 表I计数器的输出和16路选择器的输出之间的关系 [0068] The relationship between the output and the output of the counter 16 in Table I MUX

[0069] [0069]

Figure CN102938952AD00071

[0070] 在一个周期内,16个LED串在电流镜的(Γ16路输出端之间均匀切换,因此,在一个周期内各个LED串获得的驱动电流为: [0070] In one cycle, 16 uniformly switch between LED strings (Γ16 output terminal of the current mirror, and therefore, the driving current in a cycle of each of the LED strings is obtained by:

Figure CN102938952AD00072

[0072] 由于多路选择器在每次接收到控制信号后的切换速度很快,人眼具有滤波功能,不会察觉出各个LED串的电流瞬间变换带来的LED灯亮度的不同,因此实现了LED灯的亮度均匀。 [0072] Since the multiplexer quickly, the human eye has filtering after each switching speed control signal is received, current will not notice instantly transform different respective LED strings bring brightness LED lamp, thus achieving uniformity of brightness of the LED lamp.

[0073] 本说明书中各个实施例采用递进的方式描述,每个实施例重点说明的都是与其他实施例的不同之处,各个实施例之间相同相似部分互相参见即可。 [0073] In the present specification, the various embodiments described in a progressive manner, differences from the embodiment and the other embodiments each of which emphasizes embodiment, the same or similar portions between the various embodiments refer to each other.

[0074] 对所公开的实施例的上述说明,使本领域专业技术人员能够实现或使用本发明。 [0074] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. 对这些实施例的多种修改对本领域的专业技术人员来说将是显而易见的,本文中所定义的一般原理可以在不脱离本发明的精神或范围的情况下,在其它实施例中实现。 Various modifications to these professionals skilled in the art of the present embodiments will be apparent, and the generic principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. 因此,本发明将不会被限制于本文所示的这些实施例,而是要符合与本文所公开的原理和新颖特点相一致的最宽的范围。 Accordingly, the present invention will not be limited to the embodiments shown herein but is to be accorded herein consistent with the principles and novel features disclosed widest scope.

Claims (10)

  1. 1. 一种多个LED串的电流设定电路,其特征在于,包括:电流产生电路、具有多个输出端并且接收所述电流产生电路产生电流的电流镜、以及选择切换模块;其中: 所述选择切换模块在所述电流镜的输出端与LED串之间进行一对一连通,并且在设定时间内将所述一对一连通进行不重复的切换,使得在该设定时间内每个LED串与电流镜的所有输出端都进行过一对一连通。 1. An LED strings of the plurality of current setting circuit, characterized by comprising: a current generating circuit, having a plurality of outputs and receiving the current generating circuit generates a current mirror current, and a selection switch module; wherein: the selecting one of said communication switching module between the output terminal of the current mirror with the LED string, and the set time for the communication do not overlap one switch, such that in each of the set time all LED strings with an output terminal of the current mirror have been one communication.
  2. 2.根据权利要求I所述的电路,其特征在于,所述选择切换模块包括控制电路和多个多路选择器; 所述控制电路用于生成实时控制信号,并将所述实时控制信号发送至每个与所述控制电路相连的多路选择器; 每个所述多路选择器具有与电流镜输出端数量相同的输入端且两者一对一连通;同时各多路选择器之间,每个输入端与电流镜输出端之间的一对一连接都不相同。 The circuit according to claim I, wherein said selection switching module includes a control circuit and a plurality of multiplexers; said control circuit for generating a control signal in real time, and real-time control of the transmitted signal to each of the multiplexer control circuit is connected; simultaneously between the respective multiplexer; each of said multiplexers having the same number of current mirror output terminal and the input terminal of one of both communication , one connected between each input terminal and the output terminal of the current mirror is not the same.
  3. 3.根据权利要求2所述的电路,其特征在于,所述控制电路包括脉冲发生器和计数器;其中: 所述计数器的输入端与所述脉冲发生器相连,输出端与所述多路选择器相连,用于对所述脉冲发生器产生的时钟脉冲进行计数,并根据所计数目输出所述控制信号。 The circuit according to claim 2, characterized in that the control circuit comprises a pulse generator and a counter; wherein: said counter is connected to an input terminal of the pulse generator, the output of the multiplexer It is connected, for the clock pulses generated by the pulse generator is counted, and the control signal output in accordance with the counted number.
  4. 4.根据权利要求I所述的电路,其特征在于,还包括连接于所述选择切换模块与LED串之间的电流倍增电路。 4. The circuit according to claim I, characterized by further comprising a switch connected between the current module and the LED string selection multiplier circuit.
  5. 5.根据权利要求I所述的电路,其特征在于,所述在设定时间内将所述一对一连通进行不重复的切换是按照设定频率进行的。 The circuit according to claim I, wherein said communication of said one non-repeated switching is performed according to the set frequency within a set time.
  6. 6.根据权利要求5所述的电路,其特征在于,所述设定频率是快于人眼做出判断的频率。 The circuit according to claim 5, characterized in that the set frequency is faster than the frequency of the human eye to make judgment.
  7. 7. —种多个LED串的电流设定方法,用于多个LED串的电流设定电路中,所述电流设定电路至少包括电流产生电路,以及具有多个输出端并且接收所述电流产生电路产生电流的电流镜,其中电流镜的输出端数量与LED串数量相同,其特征在于,该方法包括: 将LED串与电流镜的输出端进行一对一连通,并且在设定时间内将所述一对一连通进行不重复的切换,使得在该设定时间内每个LED串与电流镜的所有输出端都进行过一对一连通; 重复所述设定时间内LED串与电流镜输出端的一对一的切换连通。 7. - The method of setting the current seed plurality of LED strings, the LED current setting circuit for a plurality of strings, at least the current setting circuit includes a current generating circuit, and a plurality of outputs and receiving the current current generation circuit generates a current mirror, wherein the output of the same number of the number of LED strings of the current mirror, wherein, the method comprising: an output terminal of the LED string with one to one communication with a current mirror, and the set time the one non-repeated switching of communication, so that within the set time for each LED string and all the outputs of the current mirror have been one communication; repeating the set time and the current LED string switching one communication mirror output.
  8. 8.根据权利要求7所述的方法,其特征在于,还包括将电流镜的输出电流进行倍增后传送至LED串。 8. The method according to claim 7, wherein further comprising transmitting to the LED string after the output current of the current mirror is doubled.
  9. 9.根据权利要求7所述的方法,其特征在于,所述在设定时间内将所述一对一连通进行不重复的切换是按照设定频率进行的。 9. The method according to claim 7, wherein the set time for the communication do not overlap one switching is performed in accordance with the set frequency.
  10. 10.根据权利要求9所述的方法,其特征在于,所述设定频率是快于人眼做出判断的频率。 10. The method according to claim 9, characterized in that the set frequency is faster than the frequency of the human eye to make judgment.
CN 201210249900 2012-07-18 2012-07-18 Current setting circuit of a plurality of light-emitting diode (LED) strings and method thereof CN102938952A (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070046660A1 (en) * 2005-08-24 2007-03-01 Sharp Kabushiki Kaisha Power supply circuit and electronic appliance therewith
CN102455732A (en) * 2010-11-03 2012-05-16 华润矽威科技(上海)有限公司 Circuit capable of improving matching degree of multi-path large current

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070046660A1 (en) * 2005-08-24 2007-03-01 Sharp Kabushiki Kaisha Power supply circuit and electronic appliance therewith
CN102455732A (en) * 2010-11-03 2012-05-16 华润矽威科技(上海)有限公司 Circuit capable of improving matching degree of multi-path large current

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