WO2022007137A1 - 智能笔红外驱动电路 - Google Patents

智能笔红外驱动电路 Download PDF

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Publication number
WO2022007137A1
WO2022007137A1 PCT/CN2020/110943 CN2020110943W WO2022007137A1 WO 2022007137 A1 WO2022007137 A1 WO 2022007137A1 CN 2020110943 W CN2020110943 W CN 2020110943W WO 2022007137 A1 WO2022007137 A1 WO 2022007137A1
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infrared
smart pen
resistor
capacitor
drive circuit
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PCT/CN2020/110943
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English (en)
French (fr)
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卢启伟
陈方圆
卢炀
陈鹏宇
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深圳市鹰硕教育服务有限公司
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Publication of WO2022007137A1 publication Critical patent/WO2022007137A1/zh

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
    • G06F3/0354—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor with detection of 2D relative movements between the device, or an operating part thereof, and a plane or surface, e.g. 2D mice, trackballs, pens or pucks
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
    • G06F3/038—Control and interface arrangements therefor, e.g. drivers or device-embedded control circuitry

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  • the utility model relates to the technical field of a smart pen, in particular to an infrared driving circuit of a smart pen.
  • a smart pen can print a layer of invisible dot pattern on ordinary paper.
  • the high-speed camera at the front of the digital pen captures the movement trajectory of the pen tip at any time, and the pressure sensor transmits the pressure data back to the data processor. Finally, the information is transmitted out through Bluetooth or USB cable. Synchronize the handwriting recording process with the writing process.
  • the dot matrix digital pen stores the words or pictures written on the paper in the computer in the form of bitmaps to form documents.
  • the smart pen In the process of writing, the smart pen needs to emit infrared signals and collect the reflected infrared light signals in real time.
  • the smart pen considering its small size, a brand-new simple structure, easy to maintain and easy to maintain is urgently needed.
  • a high-efficiency smart pen infrared drive circuit solution is urgently needed.
  • the embodiments of the present invention provide a smart pen infrared drive circuit, which is used to provide a smart pen infrared drive circuit with a simple structure, easy maintenance and high work efficiency by means of hardware structure and hardware structure combination.
  • the smart pen infrared drive circuit includes:
  • the embodiment of the present utility model provides an infrared driving circuit of a smart pen, including:
  • the interface terminal includes a first port and a second port, the first port is used to provide a high-level power signal, and the first port is sequentially connected with the first resistor and the first inductor to form a high-level a supply point, the second port provides a ground connection signal, and the second port is connected to the ground through a second inductor;
  • a voltage transformation conversion chip which performs level conversion on the high-level power supply signal at the high-level supply point to form a conversion voltage
  • the pressure sensor receives the conversion voltage generated by the voltage conversion conversion chip, and generates a smart pen activation signal based on the pressing action of the smart pen;
  • the base terminal of the switching triode is connected to the output terminal of the pressure sensor, so as to generate a switching operation for the conversion voltage based on the activation signal, the emitter of the switching triode is connected to the output of the voltage conversion chip end connection;
  • An infrared transceiver circuit the input end of the infrared transceiver circuit is connected to the collector of the switching transistor, so that after the pressure sensor generates an activation signal, the infrared transceiver circuit generates infrared light and collects the reflected infrared light.
  • the infrared transceiver circuit includes an infrared emission module.
  • the infrared emission module includes an infrared light-emitting diode and a fourth resistor connected in series, the first end of the infrared light-emitting diode is connected to the collector of the switching transistor, and the The second end of the infrared light emitting diode is connected to the first end of the fourth resistor, and the second end of the fourth resistor is grounded.
  • the infrared transceiver circuit includes an infrared acquisition module.
  • the infrared acquisition module includes a second resistor, a third resistor, an infrared induction triode and a fifth capacitor;
  • the first end of the second resistor is connected to the collector of the switching transistor, and the second end of the second resistor is connected to the emitter of the infrared induction transistor;
  • the first end of the third resistor is connected to the second end of the second resistor, and the second end of the third resistor is connected to the base end of the infrared induction triode;
  • the first end of the fifth capacitor is connected to the base end of the infrared sensing triode, and the second end of the fifth capacitor is connected to the infrared signal collection end of the smart pen processor.
  • the voltage transformation circuit includes a voltage conversion chip, and the voltage conversion chip converts the 5V voltage at the high-level supply point into a 3.3V voltage.
  • the input terminal of the voltage conversion chip is connected to the first terminal of the first capacitor and the second capacitor, and the second terminal of the first capacitor and the second capacitor is grounded.
  • the output end of the voltage conversion chip is connected to the first ends of the third capacitor and the fourth capacitor, and the second ends of the third capacitor and the fourth capacitor are grounded.
  • the first end of the first resistor is connected to the first end of the first electrostatic discharge diode, and the second end of the first electrostatic discharge diode is connected to the ground.
  • the pressure sensor is disposed at the tip of the smart pen.
  • the smart pen infrared drive circuit includes an interface terminal, wherein the interface terminal includes a first port and a second port, the first port is used to provide a high-level power supply signal, and the first ports are sequentially It is connected with the first resistor and the first inductor to form a high-level supply point, the second port provides a ground connection signal, and the second port is connected to the ground through the second inductor; a voltage conversion conversion chip, the voltage conversion conversion conversion The chip performs level conversion on the high-level power supply signal at the high-level supply point to form a conversion voltage; the pressure sensor receives the conversion voltage generated by the voltage conversion conversion chip, and based on the pressing action of the smart pen, Generating a smart pen activation signal; a switching triode, the base end of the switching triode is connected to the output end of the pressure sensor, so as to generate a switching operation for the conversion voltage based on the activation signal, and the emitter of the switching triode is connected to the output end of the pressure sensor.
  • the output end of the voltage conversion chip is connected; the infrared transceiver circuit, the input end of the infrared transceiver circuit is connected to the collector of the switching transistor, so that after the pressure sensor generates an activation signal, the infrared transceiver circuit generates infrared light, and The reflected infrared light is collected.
  • the infrared signals of the smart pen can be sent and received quickly and effectively.
  • FIG. 1 is a schematic structural diagram of an infrared driving circuit for a smart pen provided by an embodiment of the present invention
  • FIG. 2 is a schematic diagram of an assembly structure of an infrared sensor on a smart pen provided by an embodiment of the present invention.
  • an embodiment of the present invention provides an infrared driving circuit for a smart pen, including: an interface terminal, a voltage transformation chip, a pressure sensor, a switching transistor, and an infrared transceiver circuit.
  • the interface terminal is used to receive the power signal
  • the interface terminal includes a first port and a second port
  • the first port is used to provide a high-level power signal
  • the first port is sequentially connected with the first resistor R1 and the first inductor L1 is connected to form a high-level supply point
  • the second port provides a ground connection signal
  • the second port is connected to ground through a second inductor L2.
  • the voltage transformation chip is used to perform voltage conversion on the high-level power supply signal. It is a voltage of 12V or 5V, and the conversion voltage can be a voltage of 3.3V.
  • the pressure sensor is arranged with the position of the pen tip of the smart pen, and is used for detecting whether the smart pen produces a writing action, and generates a pressure sensing signal based on the writing action of the smart pen.
  • the pressure sensor receives the conversion voltage generated by the voltage conversion conversion chip, and generates a smart pen activation signal based on the pressing action of the smart pen.
  • the switch transistor Q1 is used to control the switch of the power supply on the infrared transceiver circuit, and the base terminal of the switch transistor Q1 is connected to the output terminal of the pressure sensor, so as to generate a switch operation for the conversion voltage based on the activation signal, the switch
  • the emitter of the transistor Q1 is connected to the output end of the voltage conversion chip.
  • the input end of the infrared transceiver circuit is connected to the collector of the switching transistor Q1, so that after the pressure sensor generates an activation signal, the infrared transceiver circuit generates infrared light and collects the reflected infrared light.
  • the infrared transceiver circuit includes an infrared emission module.
  • the infrared emission module includes an infrared light-emitting diode D2 and a fourth resistor R4 connected in series, and the first end of the infrared light-emitting diode D2 is connected to the collector of the switching transistor Q1. connected, the second end of the infrared light-emitting diode D2 is connected to the first end of the fourth resistor R4, and the second end of the fourth resistor R4 is grounded.
  • the infrared transceiver circuit includes an infrared acquisition module.
  • the infrared acquisition module includes a second resistor R2, a third resistor R3, an infrared sensing transistor Q2 and a fifth capacitor C5;
  • the first end of the second resistor R2 is connected to the collector of the switching transistor Q1, and the second end of the second resistor R2 is connected to the emitter of the infrared sensing transistor Q2;
  • the first end of the third resistor R3 is connected to the second end of the second resistor R2, and the second end of the third resistor R3 is connected to the base end of the infrared sensing transistor Q2;
  • the first end of the fifth capacitor C5 is connected to the base end of the infrared sensing transistor Q2, and the second end of the fifth capacitor C5 is connected to the infrared signal collecting end of the smart pen processor.
  • the voltage transformation circuit includes a voltage conversion chip, and the voltage conversion chip converts the 5V voltage at the high-level supply point into a 3.3V voltage.
  • the input terminal of the voltage conversion chip is connected to the first terminals of the first capacitor C1 and the second capacitor C2, and the first capacitor C1 and the second capacitor C2 Both ends are grounded.
  • the output end of the voltage conversion chip is connected to the first ends of the third capacitor C3 and the fourth capacitor C4, and the third capacitor C3 and the fourth capacitor C4 Both ends are grounded.
  • the first end of the first resistor R1 is connected to the first end of the first electrostatic discharge diode, and the second end of the first electrostatic discharge diode is connected to the ground.
  • the pressure sensor is disposed at the tip of the smart pen.
  • the terms “installed”, “connected” and “connected” should be understood in a broad sense, for example, it may be a fixed connection or a connectable connection.
  • Detachable connection, or integral connection may be mechanical connection or electrical connection; may be direct connection, or indirect connection through an intermediate medium, or internal communication between two components.
  • the specific meanings of the above terms in the present invention can be understood in specific situations.

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Abstract

一种智能笔红外驱动电路，属于智能笔技术领域，包括：接口端子、变压转换芯片、压力传感器、开关三极管，该开关三极管的基端与该压力传感器的输出端连接，以便于基于该激活信号生成针对转换电压的开关操作，该开关三极管的发射极与该电压转换芯片的输出端连接；红外收发电路，该红外收发电路的输入端与该开关三极管的集电极连接，以使得压力传感器产生激活信号之后，该红外收发电路发生红外光线，并采集反射回来的红外光，该智能笔红外驱动电路能够基于压力信号快速开启红外发射和信号采集操作。

Description

智能笔红外驱动电路 技术领域
本实用新型涉及智能笔技术领域，尤其涉及一种智能笔红外驱动电路。
背景技术
书写是一种很奇妙的体验，在纸上书写永远有着一种魅力，即便是在信息化时代，人们总是渴望保存手写笔记的愿望。特别是在智慧教育方面，当电磁书写识别、红外点阵识别、超声波识别等黑科技融入到书写之中，便有了各式各样的智能书写笔。
智能笔作为智能笔的一种类型，可以在普通纸张上印刷一层不可见的点阵图案，数码笔前端的高速摄像头随时捕捉笔尖的运动轨迹，同时压力传感器将压力数据传回数据处理器，最终将信息通过蓝牙或者USB线向外传输。做到笔迹记录过程与书写过程同步。当书写时，点阵数码笔将纸张上书写的文字或者图片以位图的形式存储在电脑中，形成文档。
智能笔在书写的过程中，需要发射红外信号，并实时的采集反射回来的红外光信号，对于智能笔而言，考虑到其自身体积较小，亟需一种全新的结构简单、易维护且工作效率高的智能笔红外驱动电路解决方案。
实用新型内容
有鉴于此，本实用新型实施例提供了一种智能笔红外驱动电路，用以通过硬件结构及硬件结构组合的方式，提供一种结构简单、易维护且工作效率高的智能笔红外驱动电路解决方案，该智能笔红外驱动电路包括：
本实用新型实施例提供了一种智能笔红外驱动电路，包括：
接口端子，所述接口端子包括第一端口和第二端口，所述第一端口用于提供高电平电源信号，所述第一端口依次与第一电阻和第一电感连接，形成高电平供应点，所述第二端口提供地连接信号，所述第二端口通过第二电感与地连接；
变压转换芯片，所述变压转换芯片将高电平供应点处的高电平电源信号 进行电平转换，形成转换电压；
压力传感器，所述压力传感器接收所述变压转换芯片产生的转换电压，并基于智能笔的按压动作，生成智能笔激活信号；
开关三极管，所述开关三极管的基端与所述压力传感器的输出端连接，以便于基于所述激活信号生成针对转换电压的开关操作，所述开关三极管的发射极与所述电压转换芯片的输出端连接；
红外收发电路，所述红外收发电路的输入端与所述开关三极管的集电极连接，以使得压力传感器产生激活信号之后，所述红外收发电路发生红外光线，并采集反射回来的红外光。
根据本实用新型实施例的一种具体实现方式，所述红外收发电路包括红外发射模块。
根据本实用新型实施例的一种具体实现方式，所述红外发射模块包括串联的红外发光二极管和第四电阻，所述红外发光二极管的第一端与所述开关三极管的集电极连接，所述红外发光二极管的第二端与所述第四电阻的第一端连接，所述第四电阻的第二端接地。
根据本实用新型实施例的一种具体实现方式，所述红外收发电路包括红外采集模块。
根据本实用新型实施例的一种具体实现方式，所述红外采集模块包括第二电阻、第三电阻、红外感应三极管和第五电容；
所述第二电阻的第一端与所述开关三极管的集电极连接，所述第二电阻的第二端与所述红外感应三极管的发射极连接；
所述第三电阻的第一端与所述第二电阻的第二端连接，所述第三电阻的第二端与所述红外感应三极管的基端连接；
所述第五电容的第一端与所述红外感应三极管的基端连接，所述第五电容的第二端与智能笔处理器的红外信号采集端连接。
根据本实用新型实施例的一种具体实现方式，所述变压电路包括电压转换芯片，所述电压转换芯片将高电平供应点处的5V电压转换成3.3V电压。
根据本实用新型实施例的一种具体实现方式，所述电压转换芯片的输入端与第一电容和第二电容的第一端连接，所述第一电容和第二电容的第二端接地。
根据本实用新型实施例的一种具体实现方式，所述电压转换芯片的输出端与第三电容和第四电容的第一端连接，所述第三电容和第四电容的第二端接地。
根据本实用新型实施例的一种具体实现方式，所述第一电阻的第一端与第一静电放电二极管的第一端连接，所述第一静电放电二极管的第二端与地连接。
根据本实用新型实施例的一种具体实现方式，所述压力传感器设置在所述智能笔的笔尖处。
本实用新型实施例提供的智能笔红外驱动电路，包括接口端子，所述接口端子包括第一端口和第二端口，所述第一端口用于提供高电平电源信号，所述第一端口依次与第一电阻和第一电感连接，形成高电平供应点，所述第二端口提供地连接信号，所述第二端口通过第二电感与地连接；变压转换芯片，所述变压转换芯片将高电平供应点处的高电平电源信号进行电平转换，形成转换电压；压力传感器，所述压力传感器接收所述变压转换芯片产生的转换电压，并基于智能笔的按压动作，生成智能笔激活信号；开关三极管，所述开关三极管的基端与所述压力传感器的输出端连接，以便于基于所述激活信号生成针对转换电压的开关操作，所述开关三极管的发射极与所述电压转换芯片的输出端连接；红外收发电路，所述红外收发电路的输入端与所述开关三极管的集电极连接，以使得压力传感器产生激活信号之后，所述红外收发电路发生红外光线，并采集反射回来的红外光。通过本公开的方案，能够快速有效的对智能笔的红外信号进行收发操作。
附图说明
为了更清楚地说明本实用新型实施例的技术方案，下面将对实施例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它的附图。
图1为本实用新型实施例提供的一种智能笔红外驱动电路的结构示意图；
图2为本实用新型实施例提供的一种红外传感器在智能笔上的装配结构示意图。
具体实施方式
下面结合附图对本实用新型实施例进行详细描述。
应当明确，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作出创造性劳动前提下所获得的所有其它实施例，都属于本实用新型保护的范围。
参见图1-2，本实用新型实施例提供了一种智能笔红外驱动电路，包括：接口端子、变压转换芯片、压力传感器、开关三极管以及红外收发电路。
接口端子用于接收电源信号，所述接口端子包括第一端口和第二端口，所述第一端口用于提供高电平电源信号，所述第一端口依次与第一电阻R1和第一电感L1连接，形成高电平供应点，所述第二端口提供地连接信号，所述第二端口通过第二电感L2与地连接。
变压转换芯片用于对高电平电源信号进行电压转换，所述变压转换芯片将高电平供应点处的高电平电源信号进行电平转换，形成转换电压，例如高电平电压可以是12V或5V的电压，转化电压可以是3.3V的电压。
压力传感器设置与所述智能笔的笔尖位置，用于检测智能笔是否产生书写动作，并基于智能笔的书写动作产生压力感应信号。所述压力传感器接收所述变压转换芯片产生的转换电压，并基于智能笔的按压动作，生成智能笔激活信号。
开关三极管Q1用于控制红外收发电路上电源的开关，所述开关三极管Q1的基端与所述压力传感器的输出端连接，以便于基于所述激活信号生成针对转换电压的开关操作，所述开关三极管Q1的发射极与所述电压转换芯片的输出端连接。
红外收发电路，所述红外收发电路的输入端与所述开关三极管Q1的集电极连接，以使得压力传感器产生激活信号之后，所述红外收发电路发生红外光线，并采集反射回来的红外光。
根据本实用新型实施例的一种具体实现方式，所述红外收发电路包括红外发射模块。
根据本实用新型实施例的一种具体实现方式，所述红外发射模块包括串联的红外发光二极管D2和第四电阻R4，所述红外发光二极管D2的第一端与所述开关三极管Q1的集电极连接，所述红外发光二极管D2的第二端与所述第四电阻R4的第一端连接，所述第四电阻R4的第二端接地。
根据本实用新型实施例的一种具体实现方式，所述红外收发电路包括红外采集模块。
根据本实用新型实施例的一种具体实现方式，所述红外采集模块包括第二电阻R2、第三电阻R3、红外感应三极管Q2和第五电容C5；
所述第二电阻R2的第一端与所述开关三极管Q1的集电极连接，所述第二电阻R2的第二端与所述红外感应三极管Q2的发射极连接；
所述第三电阻R3的第一端与所述第二电阻R2的第二端连接，所述第三电阻R3的第二端与所述红外感应三极管Q2的基端连接；
所述第五电容C5的第一端与所述红外感应三极管Q2的基端连接，所述第五电容C5的第二端与智能笔处理器的红外信号采集端连接。
根据本实用新型实施例的一种具体实现方式，所述变压电路包括电压转换芯片，所述电压转换芯片将高电平供应点处的5V电压转换成3.3V电压。
根据本实用新型实施例的一种具体实现方式，所述电压转换芯片的输入端与第一电容C1和第二电容C2的第一端连接，所述第一电容C1和第二电容C2的第二端接地。
根据本实用新型实施例的一种具体实现方式，所述电压转换芯片的输出端与第三电容C3和第四电容C4的第一端连接，所述第三电容C3和第四电容C4的第二端接地。
根据本实用新型实施例的一种具体实现方式，所述第一电阻R1的第一端与第一静电放电二极管的第一端连接，所述第一静电放电二极管的第二端与地连接。
根据本实用新型实施例的一种具体实现方式，所述压力传感器设置在所述智能笔的笔尖处。
在本实用新型的描述中，需要说明的是，术语“中心”、“上”、“下”、“左”、“右”、“竖直”、“水平”、“内”、“外”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本实用新型和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本实用新型的限制。此外，术语“第一”、“第二”、“第三”仅用于描述目的，而不能理解为指示或暗示相对重要性。
在本实用新型的描述中，需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通。对于本领域的普通技术人员而言，可以具体情况理解上述术语在本实用新型中的具体含义。
以上所述，仅为本实用新型的具体实施方式，但本实用新型的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本实用新型揭露的技术范围内，可轻易想到的变化或替换，都应涵盖在本实用新型的保护范围之内。因此，本实用新型的保护范围应以权利要求的保护范围为准。
工业实用性
通过本方案，能够基于压力信号快速开启红外发射和信号采集操作。

Claims (10)

  1. 一种智能笔红外驱动电路，其特征在于，包括：
    接口端子，所述接口端子包括第一端口和第二端口，所述第一端口用于提供高电平电源信号，所述第一端口依次与第一电阻和第一电感连接，形成高电平供应点，所述第二端口提供地连接信号，所述第二端口通过第二电感与地连接；
    变压转换芯片，所述变压转换芯片将高电平供应点处的高电平电源信号进行电平转换，形成转换电压；
    压力传感器，所述压力传感器接收所述变压转换芯片产生的转换电压，并基于智能笔的按压动作，生成智能笔激活信号；
    开关三极管，所述开关三极管的基端与所述压力传感器的输出端连接，以便于基于所述激活信号生成针对转换电压的开关操作，所述开关三极管的发射极与所述电压转换芯片的输出端连接；
    红外收发电路，所述红外收发电路的输入端与所述开关三极管的集电极连接，以使得压力传感器产生激活信号之后，所述红外收发电路发生红外光线，并采集反射回来的红外光。
  2. 根据权利要求1所述的智能笔红外驱动电路，其特征在于：
    所述红外收发电路包括红外发射模块。
  3. 根据权利要求2所述的智能笔红外驱动电路，其特征在于：
    所述红外发射模块包括串联的红外发光二极管和第四电阻，所述红外发光二极管的第一端与所述开关三极管的集电极连接，所述红外发光二极管的第二端与所述第四电阻的第一端连接，所述第四电阻的第二端接地。
  4. 根据权利要求1所述的智能笔红外驱动电路，其特征在于：
    所述红外收发电路包括红外采集模块。
  5. 根据权利要求4所述的智能笔红外驱动电路，其特征在于：
    所述红外采集模块包括第二电阻、第三电阻、红外感应三极管和第五电容；
    所述第二电阻的第一端与所述开关三极管的集电极连接，所述第二电阻的第二端与所述红外感应三极管的发射极连接；
    所述第三电阻的第一端与所述第二电阻的第二端连接，所述第三电阻的第二端与所述红外感应三极管的基端连接；
    所述第五电容的第一端与所述红外感应三极管的基端连接，所述第五电容的第二端与智能笔处理器的红外信号采集端连接。
  6. 根据权利要求1所述的智能笔红外驱动电路，其特征在于：
    所述变压电路包括电压转换芯片，所述电压转换芯片将高电平供应点处的5V电压转换成3.3V电压。
  7. 根据权利要求6所述的智能笔红外驱动电路，其特征在于：
    所述电压转换芯片的输入端与第一电容和第二电容的第一端连接，所述第一电容和第二电容的第二端接地。
  8. 根据权利要求7所述的智能笔红外驱动电路，其特征在于：
    所述电压转换芯片的输出端与第三电容和第四电容的第一端连接，所述第三电容和第四电容的第二端接地。
  9. 根据权利要求1所述的智能笔红外驱动电路，其特征在于：
    所述第一电阻的第一端与第一静电放电二极管的第一端连接，所述第一静电放电二极管的第二端与地连接。
  10. 根据权利要求1所述的智能笔红外驱动电路，其特征在于：
    所述压力传感器设置在所述智能笔的笔尖处。
PCT/CN2020/110943 2020-07-07 2020-08-25 智能笔红外驱动电路 WO2022007137A1 (zh)

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