WO2022000739A1 - Smart pen pressure sensor drive circuit - Google Patents

Smart pen pressure sensor drive circuit Download PDF

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Publication number
WO2022000739A1
WO2022000739A1 PCT/CN2020/110941 CN2020110941W WO2022000739A1 WO 2022000739 A1 WO2022000739 A1 WO 2022000739A1 CN 2020110941 W CN2020110941 W CN 2020110941W WO 2022000739 A1 WO2022000739 A1 WO 2022000739A1
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Prior art keywords
pressure sensor
smart pen
voltage
port
capacitor
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PCT/CN2020/110941
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French (fr)
Chinese (zh)
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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 WO2022000739A1 publication Critical patent/WO2022000739A1/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers

Definitions

  • the utility model relates to the technical field of a smart pen, in particular to a driving circuit of a pressure sensor of the 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 order to save energy, the smart pen needs to be in a dormant state when it is not working, and once the smart pen is in a working state, it needs to trigger the smart pen to be in a working state in time.
  • the smart pen pressure sensor driver circuit solution In order to save energy, the smart pen needs to be in a dormant state when it is not working, and once the smart pen is in a working state, it needs to trigger the smart pen to be in a working state in time.
  • the embodiments of the present invention provide a smart pen pressure sensor driving circuit, which is used to provide a smart pen pressure sensor driving circuit with a simple structure, easy maintenance and high work efficiency by means of hardware structure and hardware structure combination.
  • the circuit solution, the smart pen pressure sensor driving circuit includes:
  • the embodiment of the present utility model provides a driving circuit for a pressure sensor 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 and 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 inverting terminal of the operational amplifier is connected to the ground through a third resistor, and the non-inverting terminal of the operational amplifier is connected to the output terminal of the transformer chip;
  • the collector of the switching triode is connected to the output terminal of the operational amplifier through a second resistor, and the base of the switching triode is connected to the inverting terminal of the operational amplifier;
  • the input end of the pressure sensor is connected to the emitter of the switching transistor for receiving the input voltage
  • a processor pressure signal interface, the processor power supply pressure signal interface is used to receive the pressure signal output by the output end of the pressure sensor.
  • the voltage signal formed by the high-level supply point is a 5V voltage signal.
  • 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 first port and the second port are arranged in parallel in the form of USB interfaces.
  • the smart pen pressure sensor driving circuit includes an interface terminal, 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 Connect to the first resistor and the first inductor in sequence 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;
  • the conversion chip performs level conversion on the high-level power supply signal at the high-level supply point to form a conversion voltage; an operational amplifier, the inverting terminal of the operational amplifier is connected to the ground through a third resistor, and the non-inverting terminal of the operational amplifier is connected to the ground.
  • switch triode Connect with the output end of the voltage transformer conversion chip; switch triode, the collector of the switch triode is connected to the output end of the operational amplifier through the second resistor, and the base of the switch triode is inverting the phase of the operational amplifier terminal connection; pressure sensor, the input terminal of the pressure sensor is connected to the emitter of the switching transistor for receiving the input voltage; processor pressure signal interface, the processor power supply pressure signal interface is used to receive the pressure sensor The pressure signal output by the output terminal.
  • FIG. 1 is a schematic structural diagram of a smart pen pressure sensor driving circuit according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of an assembly structure of a pressure sensor on a smart pen provided by an embodiment of the present invention.
  • an embodiment of the present invention provides a smart pen pressure sensor drive circuit, including: an interface terminal, a voltage transformation chip, an operational amplifier, a switching transistor, a pressure sensor, and a processor pressure signal interface.
  • the interface terminal is used to receive a power signal from the outside, 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 high-level power signal can be 5V or 12V voltage signal, the first port is connected to the first resistor R1 and the first inductor L1 in sequence 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 L2 .
  • the voltage transformation chip is used to convert the voltage signal input by the interface terminal.
  • the voltage input is converted into a conversion voltage of 3.3V.
  • the operational amplifier N is used to amplify the signal, the inverting terminal of the operational amplifier N is connected to the ground through the third resistor R3, and the non-inverting terminal of the operational amplifier N is connected to the output terminal of the voltage transformation chip;
  • the switching transistor M is used for switching the input voltage, the collector of the switching transistor M is connected to the output end of the operational amplifier N through the second resistor R2, and the base of the switching transistor M is connected to the operational amplifier N The inverting terminal is connected;
  • the user of the pressure sensor senses the writing pressure on the smart pen, and the input end of the pressure sensor is connected to the emitter of the switching transistor M for receiving the input voltage.
  • the processor pressure signal interface is used to receive the pressure signal by means of I/O, and the processor power supply pressure signal interface is used to receive the pressure signal output from the output end of the pressure sensor.
  • the voltage signal formed by the high-level supply point is a 5V voltage signal.
  • the transformer 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 is connected to the first end of the first electrostatic discharge diode D1, and the second end of the first electrostatic discharge diode D1 is connected to the ground .
  • the pressure sensor is disposed at the tip of the smart pen.
  • the first port and the second port are arranged in parallel in the form of USB interfaces.
  • 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.
  • pressure detection sensing can be provided for the smart pen.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Measuring Fluid Pressure (AREA)

Abstract

A smart pen pressure sensor drive circuit, relating to the technical field of smart pens. The smart pen pressure sensor drive circuit comprises: an interface terminal; a voltage transformation and conversion chip; an operational amplifier (N), an inverse-phase end of the operational amplifier (N) being connected to the ground by means of a third resistor (R3), and an in-phase end of the operational amplifier (N) being connected to an output end of the voltage transformation and conversion chip; a switch triode (M), a collector of the switch triode (M) being connected to an output end of the operational amplifier (N) by means of a second resistor (R2), and a base of the switch triode (M) being connected to the inverse-phase end of the operational amplifier (N); a pressure sensor, an input end of the pressure sensor being connected to an emitter of the switch triode (M) for receiving an input voltage; and a processor pressure signal interface used for receiving a pressure signal outputted by an output end of the pressure sensor. The smart pen pressure sensor drive circuit can provide pressure measurement and sensing for smart pens.

Description

智能笔压力传感器驱动电路Smart Pen Pressure Sensor Driver Circuit 技术领域technical field
本实用新型涉及智能笔技术领域，尤其涉及一种智能笔压力传感器驱动电路。The utility model relates to the technical field of a smart pen, in particular to a driving circuit of a pressure sensor of the smart pen.
背景技术Background technique
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。Writing is a wonderful experience. Writing on paper always has a charm. Even in the information age, people are always eager to save handwritten notes. Especially in the field of smart education, when electromagnetic writing recognition, infrared dot matrix recognition, ultrasonic recognition and other black technologies are integrated into writing, there are all kinds of smart writing pens.
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。As a type of 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. When writing, 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.
为了节省能源，智能笔在不工作的时候需要处于休眠状态，而一旦智能笔处于工作状态，就需要及时的触发智能笔处于工作状态，亟需一种全新的结构简单、易维护且工作效率高的智能笔压力传感器驱动电路解决方案。In order to save energy, the smart pen needs to be in a dormant state when it is not working, and once the smart pen is in a working state, it needs to trigger the smart pen to be in a working state in time. The smart pen pressure sensor driver circuit solution.
实用新型内容Utility model content
有鉴于此，本实用新型实施例提供了一种智能笔压力传感器驱动电路，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压力传感器驱动电路解决方案，该智能笔压力传感器驱动电路包括：In view of this, the embodiments of the present invention provide a smart pen pressure sensor driving circuit, which is used to provide a smart pen pressure sensor driving circuit with a simple structure, easy maintenance and high work efficiency by means of hardware structure and hardware structure combination. The circuit solution, the smart pen pressure sensor driving circuit includes:
本实用新型实施例提供了一种智能笔压力传感器驱动电路，包括：The embodiment of the present utility model provides a driving circuit for a pressure sensor of a smart pen, including:
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；an interface terminal, 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;
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；a voltage transformation and conversion chip, which performs level conversion on the high-level power supply signal at the high-level supply point to form a conversion voltage;
运算放大器，所述运算放大器的反相端通过第三电阻与地连接，所述运算放大器的同相端与变压转换芯片的输出端进行连接；an operational amplifier, the inverting terminal of the operational amplifier is connected to the ground through a third resistor, and the non-inverting terminal of the operational amplifier is connected to the output terminal of the transformer chip;
开关三极管，所述开关三极管的集电极通过第二电阻与所述运算放大器的输出端连接，所述开关三极管的基极与所述运算放大器的反相端连接；a switching triode, the collector of the switching triode is connected to the output terminal of the operational amplifier through a second resistor, and the base of the switching triode is connected to the inverting terminal of the operational amplifier;
压力传感器，所述压力传感器的输入端与所述开关三极管的发射极连接，用于接收输入电压；a pressure sensor, the input end of the pressure sensor is connected to the emitter of the switching transistor for receiving the input voltage;
处理器压力信号接口，所述处理器电源压力信号接口用于接收所述压力传感器输出端输出的压力信号。A processor pressure signal interface, the processor power supply pressure signal interface is used to receive the pressure signal output by the output end of the pressure sensor.
根据本实用新型实施例的一种具体实现方式，所述高电平供应点形成的电压信号为5V电压信号。According to a specific implementation manner of the embodiment of the present invention, the voltage signal formed by the high-level supply point is a 5V voltage signal.
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。According to a specific implementation of the embodiment of the present invention, 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.
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。According to a specific implementation of the embodiment of the present invention, 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.
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。According to a specific implementation manner of the embodiment of the present invention, 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.
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。According to a specific implementation of the embodiment of the present invention, 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.
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。According to a specific implementation manner of the embodiment of the present invention, the pressure sensor is disposed at the tip of the smart pen.
根据本实用新型实施例的一种具体实现方式，所述第一端口、所述第二端口以USB接口的形式平行设置。According to a specific implementation manner of the embodiment of the present invention, the first port and the second port are arranged in parallel in the form of USB interfaces.
本实用新型实施例提供的智能笔压力传感器驱动电路，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；运算放大器，所述运算放大器的反相端通过第三电阻与地连接，所述运算放大器的同相端与变压转换芯片的输出端进行连接；开关三极管，所述开关三极管的集电极通过第二电阻与所述运算放大器的输出端连接，所述开关三极管的基极与所述运算放大器的反相端连接；压力传感器，所述压力传感器的输入端与所述开关三极管的发射极连接，用于接收输入电压；处理器压力信号接口，所述处理器电源压力信号接口用于接收所述压力传感器输出端输出的压力信号。通过本公开的方案，能够快速有效的对智能笔的压力信号进行检测。The smart pen pressure sensor driving circuit provided by the embodiment of the present invention includes an interface terminal, 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 Connect to the first resistor and the first inductor in sequence 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; The conversion chip performs level conversion on the high-level power supply signal at the high-level supply point to form a conversion voltage; an operational amplifier, the inverting terminal of the operational amplifier is connected to the ground through a third resistor, and the non-inverting terminal of the operational amplifier is connected to the ground. Connect with the output end of the voltage transformer conversion chip; switch triode, the collector of the switch triode is connected to the output end of the operational amplifier through the second resistor, and the base of the switch triode is inverting the phase of the operational amplifier terminal connection; pressure sensor, the input terminal of the pressure sensor is connected to the emitter of the switching transistor for receiving the input voltage; processor pressure signal interface, the processor power supply pressure signal interface is used to receive the pressure sensor The pressure signal output by the output terminal. Through the solution of the present disclosure, the pressure signal of the smart pen can be detected quickly and effectively.
附图说明Description of drawings
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。In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the accompanying drawings required in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.
图1为本实用新型实施例提供的一种智能笔压力传感器驱动电路的结构示意图；1 is a schematic structural diagram of a smart pen pressure sensor driving circuit according to an embodiment of the present invention;
图2为本实用新型实施例提供的一种压力传感器在智能笔上的装配结构示意图。FIG. 2 is a schematic diagram of an assembly structure of a pressure sensor on a smart pen provided by an embodiment of the present invention.
具体实施方式detailed description
下面结合附图对本实用新型实施例进行详细描述。The embodiments of the present utility model will be described in detail below with reference to the accompanying drawings.
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。It should be clear that the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.
参见图1-2，本实用新型实施例提供了一种智能笔压力传感器驱动电路，包括：接口端子、变压转换芯片、运算放大器、开关三极管、压力传感器以及处理器压力信号接口。1-2, an embodiment of the present invention provides a smart pen pressure sensor drive circuit, including: an interface terminal, a voltage transformation chip, an operational amplifier, a switching transistor, a pressure sensor, and a processor pressure signal interface.
接口端子用于从外部接收电源信号，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，该高电平电源信号可以是5V或12V电压的信号，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。The interface terminal is used to receive a power signal from the outside, 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 high-level power signal can be 5V or 12V voltage signal, the first port is connected to the first resistor R1 and the first inductor L1 in sequence 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 L2 .
变压转换芯片用于对接口端子输入的电压信号进行转化，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，可以将5V的电压输入转化成3.3V的转换电压。The voltage transformation chip is used to convert the voltage signal input by the interface terminal. The voltage input is converted into a conversion voltage of 3.3V.
运算放大器N用于信号进行放大操作，所述运算放大器N的反相端通过第三电阻R3与地连接，所述运算放大器N的同相端与变压转换芯片的输出端进行连接；The operational amplifier N is used to amplify the signal, the inverting terminal of the operational amplifier N is connected to the ground through the third resistor R3, and the non-inverting terminal of the operational amplifier N is connected to the output terminal of the voltage transformation chip;
开关三极管M用于对输入电压进行开关操作，所述开关三极管M的集电极通过第二电阻R2与所述运算放大器N的输出端连接，所述开关三极管M的基极与所述运算放大器N的反相端连接；The switching transistor M is used for switching the input voltage, the collector of the switching transistor M is connected to the output end of the operational amplifier N through the second resistor R2, and the base of the switching transistor M is connected to the operational amplifier N The inverting terminal is connected;
压力传感器用户感知智能笔上的书写压力，所述压力传感器的输入端与所述开关三极管M的发射极连接，用于接收输入电压。The user of the pressure sensor senses the writing pressure on the smart pen, and the input end of the pressure sensor is connected to the emitter of the switching transistor M for receiving the input voltage.
处理器压力信号接口用来通过I/O的方式来接收压力信号，所述处理器电源压力信号接口用于接收所述压力传感器输出端输出的压力信号。The processor pressure signal interface is used to receive the pressure signal by means of I/O, and the processor power supply pressure signal interface is used to receive the pressure signal output from the output end of the pressure sensor.
根据本实用新型实施例的一种具体实现方式，所述高电平供应点形成的电压信号为5V电压信号。According to a specific implementation manner of the embodiment of the present invention, the voltage signal formed by the high-level supply point is a 5V voltage signal.
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。According to a specific implementation manner of the embodiment of the present invention, the transformer 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.
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。According to a specific implementation of the embodiment of the present invention, 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.
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。According to a specific implementation of the embodiment of the present invention, 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.
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D1的第一端连接，所述第一静电放电二极管D1的第二端与地连接。According to a specific implementation of the embodiment of the present invention, the first end of the first resistor is connected to the first end of the first electrostatic discharge diode D1, and the second end of the first electrostatic discharge diode D1 is connected to the ground .
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。According to a specific implementation manner of the embodiment of the present invention, the pressure sensor is disposed at the tip of the smart pen.
根据本实用新型实施例的一种具体实现方式，所述第一端口、所述第二端口以USB接口的形式平行设置。According to a specific implementation manner of the embodiment of the present invention, the first port and the second port are arranged in parallel in the form of USB interfaces.
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。In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner" and "outer" The orientation or positional relationship indicated by etc. is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, with a specific orientation. Therefore, it should not be construed as a limitation on the present invention. Furthermore, the terms "first", "second", and "third" are used for descriptive purposes only and should not be construed to indicate or imply relative importance.
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。In the description of the present invention, it should be noted that, unless otherwise expressly specified and limited, 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. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.
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。The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art who is familiar with the technical field of the present invention can easily think of changes within the technical scope disclosed by the present invention. Or replacement should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.
工业实用性Industrial Applicability
通过本方案，能够为智能笔提供压力检测感应。Through this solution, pressure detection sensing can be provided for the smart pen.

Claims (8)

  1. 一种智能笔压力传感器驱动电路，其特征在于，包括：A smart pen pressure sensor drive circuit, characterized in that it includes:
    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；an interface terminal, 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;
    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；a voltage transformation and conversion chip, which performs level conversion on the high-level power supply signal at the high-level supply point to form a conversion voltage;
    运算放大器，所述运算放大器的反相端通过第三电阻与地连接，所述运算放大器的同相端与变压转换芯片的输出端进行连接；an operational amplifier, the inverting terminal of the operational amplifier is connected to the ground through a third resistor, and the non-inverting terminal of the operational amplifier is connected to the output terminal of the transformer chip;
    开关三极管，所述开关三极管的集电极通过第二电阻与所述运算放大器的输出端连接，所述开关三极管的基极与所述运算放大器的反相端连接；a switching triode, the collector of the switching triode is connected to the output terminal of the operational amplifier through a second resistor, and the base of the switching triode is connected to the inverting terminal of the operational amplifier;
    压力传感器，所述压力传感器的输入端与所述开关三极管的发射极连接，用于接收输入电压；a pressure sensor, the input end of the pressure sensor is connected to the emitter of the switching transistor for receiving the input voltage;
    处理器压力信号接口，所述处理器电源压力信号接口用于接收所述压力传感器输出端输出的压力信号。A processor pressure signal interface, the processor power supply pressure signal interface is used for receiving the pressure signal output by the output end of the pressure sensor.
  2. 根据权利要求1所述的智能笔压力传感器驱动电路，其特征在于：The smart pen pressure sensor drive circuit according to claim 1, wherein:
    所述高电平供应点形成的电压信号为5V电压信号。The voltage signal formed by the high-level supply point is a 5V voltage signal.
  3. 根据权利要求2所述的智能笔压力传感器驱动电路，其特征在于：The smart pen pressure sensor drive circuit according to claim 2, wherein:
    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。The transformer circuit includes a voltage conversion chip that converts the 5V voltage at the high-level supply point into a 3.3V voltage.
  4. 根据权利要求3所述的智能笔压力传感器驱动电路，其特征在于：The smart pen pressure sensor drive circuit according to claim 3, wherein:
    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。The input terminal of the voltage conversion chip is connected to the first terminals of the first capacitor and the second capacitor, and the second terminals of the first capacitor and the second capacitor are grounded.
  5. 根据权利要求4所述的智能笔压力传感器驱动电路，其特征在于：The smart pen pressure sensor driving circuit according to claim 4, wherein:
    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。The output terminal of the voltage conversion chip is connected to the first terminals of the third capacitor and the fourth capacitor, and the second terminals of the third capacitor and the fourth capacitor are grounded.
  6. 根据权利要求1所述的智能笔压力传感器驱动电路，其特征在于：The smart pen pressure sensor drive circuit according to claim 1, wherein:
    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。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.
  7. 根据权利要求6所述的智能笔压力传感器驱动电路，其特征在于：The smart pen pressure sensor driving circuit according to claim 6, wherein:
    所述压力传感器设置在所述智能笔的笔尖处。The pressure sensor is provided at the tip of the smart pen.
  8. 根据权利要求7所述的智能笔压力传感器驱动电路，其特征在于：所述第一端口、所述第二端口以USB接口的形式平行设置。The driving circuit of the smart pen pressure sensor according to claim 7, wherein the first port and the second port are arranged in parallel in the form of a USB interface.
PCT/CN2020/110941 2020-07-02 2020-08-25 Smart pen pressure sensor drive circuit WO2022000739A1 (en)

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US5974558A (en) * 1994-09-02 1999-10-26 Packard Bell Nec Resume on pen contact
CN201445986U (en) * 2009-06-04 2010-05-05 周小兴 Shredder touch detection circuit
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