WO2018023486A1 - Drive circuit for use in led device - Google Patents

Drive circuit for use in led device Download PDF

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Publication number
WO2018023486A1
WO2018023486A1 PCT/CN2016/093049 CN2016093049W WO2018023486A1 WO 2018023486 A1 WO2018023486 A1 WO 2018023486A1 CN 2016093049 W CN2016093049 W CN 2016093049W WO 2018023486 A1 WO2018023486 A1 WO 2018023486A1
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voltage
low
boosting
output
driving circuit
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PCT/CN2016/093049
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French (fr)
Chinese (zh)
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袁志贤
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袁志贤
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Priority to PCT/CN2016/093049 priority Critical patent/WO2018023486A1/en
Publication of WO2018023486A1 publication Critical patent/WO2018023486A1/en

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    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05FSYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10Regulating voltage or current
    • G05F1/46Regulating voltage or current wherein the variable actually regulated by the final control device is dc
    • G05F1/56Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices

Abstract

A drive circuit for use in an LED device, comprising a low dropout regulating device (210), a step-up device (220), and a feedback device (230); the low dropout regulating device comprises a first input pin (211) for use in coupling with an external input voltage (Vin) to produce a first output voltage (V1) that has a low current and is stable; the step-up device (220) is coupled with the low dropout regulating device (210) to boost the first output voltage (V1) by a certain factor, so as to obtain a drive voltage (Vd) required to drive the LED device, which is then outputted by an output pin (221); the feedback device (230) is coupled with the output pin (221) of the step-up device (220) and a second input pin (212) of the low dropout regulating device (210) to feed the outputted drive voltage (Vd) back to the low dropout regulating device (210).

Description

用于LED设备的驱动电路Drive circuit for LED devices 技术领域Technical field
本实用新型涉及一种驱动电路,特别涉及一种用于LED设备的驱动电路。The utility model relates to a driving circuit, in particular to a driving circuit for an LED device.
背景技术Background technique
请参考图1所示,现有的LED驱动系统包含升压装置110及低压差稳压装置(low dropout regulator)120,该升压装置110连接至输入电压Vin,以将该输入电压Vin升压至升压电压Vb,该低压差稳压装置120连接至该升压装置110,以对该升压电压Vb进行调整,以得到电流较小且稳定的输出电压Vo,该输出电压Vo则用于驱动发光二极管工作。Referring to FIG. 1 , the existing LED driving system includes a boosting device 110 and a low dropout regulator 120 connected to the input voltage Vin to boost the input voltage Vin. Up to the boosting voltage Vb, the low-dropout voltage stabilizing device 120 is connected to the boosting device 110 to adjust the boosting voltage Vb to obtain a smaller and stable output voltage Vo, and the output voltage Vo is used for Drive the LED to work.
但是在现有的手持式设备上,其所能提供的输入电压Vin一般约为3.6V,而发光二极管则需要4.5V的电压才能被驱动。如将该升压装置110使用1.5倍率来调升该输入电压Vin,则该升压电压Vb则为5.4V,由于该低压差稳压装置120会有一些电压降,故此时该输出电压Vo往往低于4.5V,而难以驱动该发光二极管。如此,现有的手持式设备中只能将该升压装置110使用2倍率调升该输入电压Vin,而获得约为7.2V的升压电压Vb,再通过该低压差稳压装置120输出4.5V的输出电压Vo,以驱动该发光二极管。此种方式,虽可驱动该发光二极管,但是该低压差稳压装置120将该升压电压Vb由7.2V转换成4.5V,其转换效率太低。However, in existing handheld devices, the input voltage Vin can be generally about 3.6V, while the LED requires 4.5V to be driven. If the boosting device 110 is used to increase the input voltage Vin by a factor of 1.5, the boosting voltage Vb is 5.4V. Since the low-dropout voltage regulator 120 has some voltage drop, the output voltage Vo is often Below 4.5V, it is difficult to drive the LED. Thus, in the existing handheld device, only the boosting device 110 can be used to increase the input voltage Vin by a factor of 2 to obtain a boosting voltage Vb of about 7.2V, and then output 4.5 through the low-dropout regulator 120. The output voltage Vo of V is to drive the light emitting diode. In this manner, although the light emitting diode can be driven, the low drop voltage regulator 120 converts the boosted voltage Vb from 7.2 V to 4.5 V, and the conversion efficiency is too low.
实用新型内容Utility model content
本实用新型实施例所要解决的技术问题在于提供了一种可将输 入电压转换至适合LED设备的电压且转换效率高的驱动电路。The technical problem to be solved by the embodiments of the present invention is to provide a kind of The input voltage is converted to a driving circuit suitable for the voltage of the LED device and having high conversion efficiency.
本实用新型提供了一种用于LED设备的驱动电路,包括一低压差稳压装置、一升压装置及一反馈装置,所述低压差稳压装置包括一第一输入接脚,用以耦合至外部的输入电压,以产生一低电流且稳定的第一输出电压;所述升压装置耦合至该低压差稳压装置,以将该第一输出电压依据一定倍率进行升压,以获得一可驱动该LED设备所需的驱动电压,并由一输出接脚输出;所述反馈装置耦合至该升压装置的输出接脚及该低压差稳压装置的第二输入接脚,以将输出的驱动电压反馈至该低压差稳压装置。The utility model provides a driving circuit for an LED device, comprising a low-dropout voltage regulator device, a boosting device and a feedback device, wherein the low-dropout voltage stabilizing device comprises a first input pin for coupling An external input voltage to generate a low current and stable first output voltage; the boosting device is coupled to the low dropout voltage regulator to boost the first output voltage according to a certain ratio to obtain a Driving voltage required for driving the LED device, and outputting by an output pin; the feedback device is coupled to an output pin of the boosting device and a second input pin of the low dropout regulator to output The driving voltage is fed back to the low drop voltage regulator.
其中,所述升压装置的调升倍率为1.5倍、2.0倍、2.5倍或3.0倍。Wherein, the boosting device has a magnification ratio of 1.5 times, 2.0 times, 2.5 times or 3.0 times.
其中,所述反馈装置包括串联连接的第一电阻及第二电阻。Wherein, the feedback device comprises a first resistor and a second resistor connected in series.
其中,所述第一电阻的第一端连接至该升压装置的输出接脚,第二端连接至该低压差稳压装置的第二输入接脚及该第二电阻的第一端,该第二电阻的第二端连接至一低电位。The first end of the first resistor is connected to the output pin of the boosting device, and the second end is connected to the second input pin of the low-dropout voltage regulator and the first end of the second resistor. The second end of the second resistor is connected to a low potential.
其中,该低压差稳压装置包括一运算放大器及一晶体管。Wherein, the low dropout voltage regulator comprises an operational amplifier and a transistor.
其中,所述晶体管为PMOS晶体管。Wherein, the transistor is a PMOS transistor.
本实用新型通过该反馈装置,而使得该驱动电压能稳定输出,同时由使用该升压装置的输出端的驱动电压当作反馈电压,相比现有的驱动电路,本实用新型所述的驱动电路更能反应出负载的状况,而进行该驱动电压的自动调整。The utility model enables the driving voltage to be stably outputted by the feedback device, and the driving voltage of the output terminal of the boosting device is used as a feedback voltage, and the driving circuit of the present invention is compared with the existing driving circuit. It is more able to reflect the condition of the load and perform automatic adjustment of the driving voltage.
附图说明DRAWINGS
为了更清楚地说明本实用新型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实用新型的一些实施例,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;In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set forth in the drawings Other drawings may be obtained from these drawings without paying creative labor;
图1是现有的用于LED设备的驱动电路的方框图。1 is a block diagram of a conventional drive circuit for an LED device.
图2是本实用新型用于LED设备的驱动电路的较佳实施方式的方框图。2 is a block diagram of a preferred embodiment of a drive circuit for an LED device of the present invention.
图3是图2中升压装置的电路图。Figure 3 is a circuit diagram of the boosting device of Figure 2.
图4是图2中驱动电路的电路图。4 is a circuit diagram of the driving circuit of FIG. 2.
具体实施方式detailed description
下面将结合本实用新型实施例中的附图,对本实用新型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实用新型一部分实施例,而不是全部的实施例。基于本实用新型中的实施例,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,都属于本实用新型保护的范围。The technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. example. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.
首先,在对实施例进行描述之前,有必要对本文中出现的一些术语进行解释。例如:First, it is necessary to explain some of the terms appearing in this article before describing the embodiments. E.g:
本文中若出现使用“第一”、“第二”等术语来描述各种元件,但是这些元件不应当由这些术语所限制。这些术语仅用来区分一个元件和另一个元件。因此,“第一”元件也可以被称为“第二”元件而不偏离本实用新型的教导。The terms "first", "second", and the like are used herein to describe various elements, but these elements should not be limited by these terms. These terms are only used to distinguish one element from another. Thus, a "first" element may also be referred to as a "second" element without departing from the teachings of the invention.
另外,应当理解的是,当提及一元件“连接”或者“联接”到另一元件时,其可以直接地连接或直接地联接到另一元件或者也可以存 在中间元件。相反地,当提及一元件“直接地连接”或“直接地联接”到另一元件时,则不存在中间元件。In addition, it should be understood that when an element is "connected" or "coupled" to another element, it can be directly connected or directly coupled to another element or In the middle of the component. In contrast, when an element is referred to as “directly connected” or “directly connected” to another element, the.
在本文中出现的各种术语仅仅用于描述具体的实施方式的目的而无意作为对本实用新型的限定。除非上下文另外清楚地指出,则单数形式意图也包括复数形式。The various terms appearing herein are merely used to describe the specific embodiments and are not intended to limit the invention. Unless the context clearly indicates otherwise, the singular forms are intended to include the plural.
当在本说明书中使用术语“包括”和/或“包括有”时,这些术语指明了所述特征、整体、步骤、操作、元件和/或部件的存在,但是也不排除一个以上其他特征、整体、步骤、操作、元件、部件和/或其群组的存在和/或附加。When the terms "include" and/or "include" are used in the specification, the terms are used to indicate the presence of the features, integers, steps, operations, components and/or components, but do not exclude one or more other features, The existence and/or addition of the whole, steps, operations, elements, components and/or groups thereof.
关于实施例:About the embodiment:
请参见图2,图2是本实用新型用于LED设备的驱动电路的方框图,所述用于LED设备的驱动电路用于将一输入电压转换至适合驱动LED设备的电压,以驱动所述LED设备。所述驱动电路包括低压差稳压装置210、升压装置220及反馈装置230。Referring to FIG. 2, FIG. 2 is a block diagram of a driving circuit for an LED device for converting an input voltage to a voltage suitable for driving an LED device to drive the LED. device. The driving circuit includes a low dropout voltage regulator 210, a boosting device 220, and a feedback device 230.
所述低压差稳压装置210包括第一输入接脚211,用以耦合至外部的输入电压Vin,以产生一低电流且稳定的第一输出电压V1。该升压装置220耦合至该低压差稳压装置210,以将该第一输出电压V1依据一定倍率进行升压,以获得一可驱动该LED设备所需要的驱动电压Vd,并由一输出接脚221输出,该升压装置220的调升倍率可为1.5倍、2.0倍、2.5倍、3.0倍。该反馈装置230耦合至该升压装置220的输出接脚221及该低压差稳压装置210的第二输入接脚212,以将该输出的驱动电压Vd反馈至该低压差稳压装置210。The low dropout voltage regulator 210 includes a first input pin 211 for coupling to an external input voltage Vin to generate a low current and stable first output voltage V1. The boosting device 220 is coupled to the low-dropout voltage regulator 210 to boost the first output voltage V1 according to a certain ratio to obtain a driving voltage Vd required to drive the LED device, and is connected by an output. The foot 221 is output, and the boosting magnification of the boosting device 220 can be 1.5 times, 2.0 times, 2.5 times, and 3.0 times. The feedback device 230 is coupled to the output pin 221 of the boost device 220 and the second input pin 212 of the low drop voltage regulator 210 to feed the output drive voltage Vd to the low drop regulator device 210.
请继续参考图3所示,本实施方式中,所述升压装置220由七个 场效应晶体管S1-S7组成,具体方式不再赘述。Please continue to refer to FIG. 3, in the embodiment, the boosting device 220 is composed of seven The field effect transistors S1-S7 are composed, and the specific manner is not described again.
请继续参考图4所示,为本实用新型驱动电路的电路图,其中,该低压差稳压装置210包括运算放大器213及PMOS晶体管214,该运算放大器213的第一输入接脚211(反相端输入接脚)连接至输入电压Vin,其第二输入接脚212(非反相端输入接脚)连接至该反馈装置230的一端点,其输出端连接至该PMOS晶体管214的栅极,该PMOS晶体管214的源极连接至高电位Vdd,其漏极连接至该升压装置220。Please refer to FIG. 4 again, which is a circuit diagram of the driving circuit of the present invention, wherein the low-dropout voltage regulator 210 includes an operational amplifier 213 and a PMOS transistor 214, and the first input pin 211 of the operational amplifier 213 (inverting terminal) The input pin is connected to the input voltage Vin, and the second input pin 212 (the non-inverting terminal input pin) is connected to an end of the feedback device 230, and the output end thereof is connected to the gate of the PMOS transistor 214. The source of the PMOS transistor 214 is connected to the high potential Vdd, and the drain thereof is connected to the boosting device 220.
所述反馈装置230包括第一电阻231及第二电阻232,所述第一电阻231与第二电阻232串联连接,所述第一电阻231的第一端连接至该升压装置220的输出接脚221,第二端连接至该低压差稳压装置210的第二输入接脚212及该第二电阻232的第一端,该第二电阻212的第二端连接至一低电位。The feedback device 230 includes a first resistor 231 and a second resistor 232. The first resistor 231 is connected in series with the second resistor 232. The first end of the first resistor 231 is connected to the output of the boosting device 220. The second end is connected to the second input pin 212 of the low-dropout voltage regulator 210 and the first end of the second resistor 232. The second end of the second resistor 212 is connected to a low potential.
下面给将对本实用新型驱动电路的工作原理进行简单的描述:The following briefly describes the working principle of the driving circuit of the present invention:
所述驱动电路先将3.6V的输入电压Vin通过低压差稳压装置210,而获得一稳定3V的第一输出电压V1,该稳定3V的第一输出电压V1经过该升压装置220而获得一调升至4.5V的驱动电压Vd。当该驱动电压Vd因为负载或其他因素而下降时,由于存在反馈装置230,该运算放大器213的第二输入接脚212上的电压Va亦跟着降低,而使该运算放大器213的输出电压亦降低,而使得跨在该PMOS晶体管上的电压减少,故该第一输出电压V1上升,经过该升压装置220而使得该驱动电压Vd上升。The driving circuit first passes the input voltage Vin of 3.6V through the low-dropout voltage regulator 210 to obtain a first output voltage V1 that is stable at 3V, and the first output voltage V1 that stabilizes 3V passes through the boosting device 220 to obtain a The drive voltage Vd is raised to 4.5V. When the driving voltage Vd drops due to load or other factors, due to the presence of the feedback device 230, the voltage Va on the second input pin 212 of the operational amplifier 213 is also decreased, and the output voltage of the operational amplifier 213 is also lowered. The voltage across the PMOS transistor is reduced, so that the first output voltage V1 rises, and the driving voltage Vd rises through the boosting device 220.
当该驱动电压Vd因为负载或其他因素而上升时,由于该反馈装置230之故,该运算放大器213的第二输入接脚212上的电压Va亦 跟着上升,而使该运算放大器213的输出电压亦上升,而使得跨在该PMOS晶体管上的电压增加,故该第一输出电压V1下降,经过该升压装置220而使得该驱动电压Vd下降。When the driving voltage Vd rises due to a load or other factors, due to the feedback device 230, the voltage Va on the second input pin 212 of the operational amplifier 213 is also Following the rise, the output voltage of the operational amplifier 213 also rises, so that the voltage across the PMOS transistor increases, so that the first output voltage V1 falls, and the boosting voltage is lowered by the boosting device 220.
由上述说明可知,本实用新型通过该反馈装置230,而使得该驱动电压Vd能稳定输出,同时由使用该升压装置220的输出端的驱动电压Vd当作反馈电压,相比现有的驱动电路,本实用新型所述的驱动电路更能反应出负载的状况,而进行该驱动电压Vd的自动调整。另外,本实用新型先将3.6V的输入电压Vin经过该低压差稳压装置210,而获得一稳定3V的第一输出电压V1,其转换效率大于现有技术中将7.2V转换成4.5V。As can be seen from the above description, the present invention enables the driving voltage Vd to be stably outputted by the feedback device 230, and the driving voltage Vd at the output end of the boosting device 220 is used as a feedback voltage, compared to the existing driving circuit. The driving circuit of the present invention is more capable of reflecting the condition of the load, and automatically adjusting the driving voltage Vd. In addition, the utility model firstly passes the input voltage Vin of 3.6V through the low-dropout voltage regulator 210 to obtain a stable first output voltage V1 of 3V, and the conversion efficiency thereof is greater than that of the prior art, which converts 7.2V into 4.5V.
以上仅为本实用新型的实施方式,并非因此限制本实用新型的专利范围,凡是利用本实用新型说明书及附图内容所作的等效结构或等效流程变换,或直接或间接运用在其他相关的技术领域,均同理包括在本实用新型的专利保护范围内。 The above is only the embodiment of the present invention, and thus does not limit the scope of the patent of the present invention. Any equivalent structure or equivalent process transformation made by using the specification and the drawings of the present invention, or directly or indirectly applied to other related The technical field is equally included in the scope of patent protection of the present invention.

Claims (6)

  1. 一种用于LED设备的驱动电路,其特征在于:所述驱动电路包括一低压差稳压装置、一升压装置及一反馈装置,所述低压差稳压装置包括一第一输入接脚,用以耦合至外部的输入电压,以产生一低电流且稳定的第一输出电压;所述升压装置耦合至该低压差稳压装置,以将该第一输出电压依据一定倍率进行升压,以获得一可驱动该LED设备所需的驱动电压,并由一输出接脚输出;所述反馈装置耦合至该升压装置的输出接脚及该低压差稳压装置的第二输入接脚,以将输出的驱动电压反馈至该低压差稳压装置。A driving circuit for an LED device, characterized in that: the driving circuit comprises a low-dropout voltage stabilizing device, a boosting device and a feedback device, and the low-dropout voltage stabilizing device comprises a first input pin. An input voltage coupled to the outside to generate a low current and stable first output voltage; the boosting device is coupled to the low dropout regulator to boost the first output voltage according to a certain ratio, Obtaining a driving voltage required for driving the LED device, and outputting by an output pin; the feedback device is coupled to an output pin of the boosting device and a second input pin of the low drop voltage regulator device, The output driving voltage is fed back to the low drop voltage regulator.
  2. 如权利要求1所述的驱动电路,其特征在于:所述升压装置的调升倍率为1.5倍、2.0倍、2.5倍或3.0倍。A driving circuit according to claim 1, wherein said boosting device has a magnification ratio of 1.5 times, 2.0 times, 2.5 times or 3.0 times.
  3. 如权利要求2所述的驱动电路,其特征在于:所述反馈装置包括串联连接的第一电阻及第二电阻。A driving circuit according to claim 2, wherein said feedback means comprises a first resistor and a second resistor connected in series.
  4. 如权利要求3所述的驱动电路,其特征在于:所述第一电阻的第一端连接至该升压装置的输出接脚,第二端连接至该低压差稳压装置的第二输入接脚及该第二电阻的第一端,该第二电阻的第二端连接至一低电位。The driving circuit of claim 3, wherein the first end of the first resistor is connected to the output pin of the boosting device, and the second end is connected to the second input of the low dropout voltage regulator The first end of the second resistor and the second end of the second resistor are connected to a low potential.
  5. 如权利要求1所述的驱动电路,其特征在于:该低压差稳压装置包括一运算放大器及一晶体管。The driving circuit of claim 1 wherein the low dropout voltage stabilizing device comprises an operational amplifier and a transistor.
  6. 如权利要求5所述的驱动电路,其特征在于:所述晶体管为PMOS晶体管。 A driving circuit according to claim 5, wherein said transistor is a PMOS transistor.
PCT/CN2016/093049 2016-08-03 2016-08-03 Drive circuit for use in led device WO2018023486A1 (en)

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Citations (9)

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CN102931842A (en) * 2012-10-12 2013-02-13 华为技术有限公司 Chip dynamic voltage regulating circuit and terminal equipment
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CN103376816A (en) * 2012-04-30 2013-10-30 英飞凌科技奥地利有限公司 Low-dropout voltage regulator
CN103677038A (en) * 2012-09-18 2014-03-26 株式会社理光 Low-dropout regulator
EP2806329A2 (en) * 2013-05-21 2014-11-26 Nxp B.V. Circuit for voltage regulation
US20150229160A1 (en) * 2014-02-07 2015-08-13 Panasonic Asia Pacific Pte. Ltd. Power failure prevention system and circuits
CN106163006A (en) * 2016-08-03 2016-11-23 袁志贤 Drive circuit for LED device
CN205847681U (en) * 2016-08-03 2016-12-28 袁志贤 Drive circuit for LED device

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120139620A1 (en) * 2007-10-24 2012-06-07 Cypress Semiconductor Corporation Supply regulated charge pump system
US8547135B1 (en) * 2009-08-28 2013-10-01 Cypress Semiconductor Corporation Self-modulated voltage reference
CN103376816A (en) * 2012-04-30 2013-10-30 英飞凌科技奥地利有限公司 Low-dropout voltage regulator
CN103677038A (en) * 2012-09-18 2014-03-26 株式会社理光 Low-dropout regulator
CN102931842A (en) * 2012-10-12 2013-02-13 华为技术有限公司 Chip dynamic voltage regulating circuit and terminal equipment
EP2806329A2 (en) * 2013-05-21 2014-11-26 Nxp B.V. Circuit for voltage regulation
US20150229160A1 (en) * 2014-02-07 2015-08-13 Panasonic Asia Pacific Pte. Ltd. Power failure prevention system and circuits
CN106163006A (en) * 2016-08-03 2016-11-23 袁志贤 Drive circuit for LED device
CN205847681U (en) * 2016-08-03 2016-12-28 袁志贤 Drive circuit for LED device

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