Capacitance pen
By introducing a starter device into the capacitor pen and connecting it to the interrupt end of the charging chip, the capacitor pen is triggered to directly supply power to power on, which solves the problem of cumbersome startup of the capacitor pen and improves the user experience.
Patent Information
- Application Number
- CN202422384075.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-29
- Publication Date
- 2025-08-26
- Estimated Expiration
- 2034-09-29
AI Technical Summary
The capacitor pen is turned off when it leaves the factory, and the user needs to charge before turning on the computer, which leads to a cumbersome boot process and affects the user experience.
A capacitor pen is designed to connect to the interrupt end of the charging chip through the starter device, triggering the interrupt end to the first level state, so that the output end of the charging chip is turned on, thereby directly supplying power to power on, simplifying the startup process.
The capacitor pen is enabled to directly turn on, avoid charging waiting, and improve user convenience and efficiency.
Smart Images
Figure CN223272867U_ABST
Abstract
Description
Technical Field
[0001] The present application belongs to the field of capacitive stylus technology, and specifically relates to a capacitive stylus. Background Art
[0002] Currently, capacitive pens equipped with electronic devices such as tablets or smartphones are turned off at the factory. After users receive the capacitive pens, they need to charge them and wait for a while before they can be activated and turned on. The boot process is relatively cumbersome, which brings certain inconveniences to users and affects their user experience. Utility Model Content
[0003] In response to the above problems, the present application provides a capacitive stylus that solves the technical problem of the complicated startup process of the capacitive stylus.
[0004] A capacitive stylus pen comprises: a battery; a charging chip comprising a battery terminal, an interrupt terminal, and a first output terminal, wherein the battery terminal is connected to the battery; a power supply chip connected to the first output terminal; and a starting device connected to the interrupt terminal, the starting device being used to output a first electrical level to the interrupt terminal, wherein the first output terminal is configured to be turned on when the interrupt terminal is at the first electrical level, so that the battery supplies power to the power supply chip via the charging chip.
[0005] In some embodiments, the capacitive stylus further includes: a main control device including a first input terminal connected to the interrupt terminal.
[0006] In some embodiments, the main control device also includes a second output terminal and a third input terminal, the charging chip also includes a second input terminal, the second output terminal is connected to the second input terminal, the third input terminal is configured to receive a shutdown signal, the second output terminal is configured to output a shutdown signal to the second input terminal, and the first output terminal is configured to be turned off when the second input terminal receives the shutdown signal, so as to disconnect the charging chip from the power supply chip.
[0007] In some embodiments, the capacitive stylus further comprises: a battery protection device comprising a first terminal, a second terminal, and a fourth input terminal, wherein the first terminal is connected to the positive terminal of the battery and the second terminal is connected to the negative terminal of the battery; the main control device further comprises a third output terminal, which is connected to the fourth input terminal. In some embodiments, the capacitive stylus further comprises: a charging device, wherein the charging chip further comprises a fifth input terminal, which is connected to the charging device, and the charging device is configured to supply power to the power chip via the first output terminal when powered on.
[0008] In some embodiments, the charging device is configured to charge the battery through the battery terminal in a powered state.
[0009] In some embodiments, the battery protection device further includes: a first TVS tube and a second TVS tube, one end of the first TVS tube is connected to the first end, one end of the second TVS tube is connected to the second end, and the other end of the first TVS tube and the other end of the second TVS tube are both grounded.
[0010] In some embodiments, the capacitive pen further includes: a first capacitor and a second capacitor, one end of the first capacitor and one end of the second capacitor are both connected to the fifth input terminal, and the other end of the first capacitor and the other end of the second capacitor are both grounded.
[0011] In some embodiments, the starting device includes a triggering device, and the triggering device is used to trigger the first level.
[0012] In some embodiments, the touch device is one of a button, a photoelectric sensor, a touch sensor, and a pressure sensor.
[0013] Correspondingly, the present application also provides an electronic device assembly, including: an electronic device, the electronic device including a display screen, and a capacitive stylus as in the above embodiment.
[0014] The beneficial effect of the present application is that the present application provides a capacitive stylus, comprising a battery, a charging chip, a power chip, and a starting device. The starting device is connected to the interrupt terminal of the charging chip, so that the starting device triggers the interrupt terminal to be in a first level state. The first output terminal is configured to be turned on when the interrupt terminal is in the first level state, so that the battery supplies power to the power chip through the charging chip, thereby achieving the purpose of turning on the capacitive stylus. The present application triggers the interrupt terminal to be in a first level state by the starting device, so that the first output terminal of the charging chip is turned on to start the power supply. The purpose of powering on can be achieved by directly starting the power supply through the starting device, avoiding the process of the capacitive stylus needing to charge and wait before activating the power on, simplifying the process of turning on the capacitive stylus, allowing users to start the power on more conveniently, and improving the convenience and efficiency of use. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.
[0016] Figure 1 A schematic diagram of the overall structure of a capacitive stylus provided in an embodiment of the present application;
[0017] Figure 2 A schematic diagram of an exemplary structure of a capacitive stylus provided in an embodiment of the present application;
[0018] Figure 3A schematic diagram of another exemplary structure of a capacitive stylus provided in an embodiment of the present application;
[0019] Figure 4 A schematic diagram of another exemplary structure of a capacitive stylus provided in an embodiment of the present application;
[0020] Figure 5 A schematic diagram of another exemplary structure of a capacitive stylus provided in an embodiment of the present application;
[0021] Figure 6 A circuit diagram of the circuit surrounding the charging chip provided in an embodiment of the present application;
[0022] Figure 7 A circuit diagram of a battery protection device provided in an embodiment of the present application;
[0023] Description of reference numerals:
[0024] 10-battery, 20-charging chip, 21-battery end, 22-interrupt end, 23-first output end, 24-second input end, 25-fifth input end, 30-power chip, 40-starting device, 50-main control device, 51-first input end, 52-second output end, 53-third input end, 54-third output end, 60-battery protection device, 61-first end, 62-second end, 63-fourth input end, 70-charging device. DETAILED DESCRIPTION
[0025] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.
[0026] In the description of this application, it should be understood that the terms "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features.
[0027] The present application provides a capacitive stylus, which is described in detail below. It should be noted that the order in which the following embodiments are described does not limit the preferred order of the embodiments of the present application. In the following embodiments, the description of each embodiment has its own emphasis. For parts not described in detail in one embodiment, please refer to the relevant description of other embodiments.
[0028] Currently, capacitive styluses that come with electronic devices such as tablets and smartphones are often powered off when they leave the factory. This is to ensure that the battery power is not consumed during transportation and storage, ensuring that the user can use the stylus normally upon receipt. Furthermore, after the stylus is produced at the factory, it is shut down. Specifically, upon receiving the shutdown command, the main control device pulls up a designated pin on the lithium battery protection chip in the stylus, causing the lithium battery protection chip to disconnect the battery power supply circuit, thereby putting the stylus into the power-off state. The lithium battery protection chip is the lithium battery protection chip. However, after receiving the stylus, if the user wants to turn it on and use it, they need to charge it. The charging process activates the lithium battery protection chip, causing it to conduct the battery power supply circuit, allowing the stylus to turn on. This cumbersome startup process brings certain inconveniences to the user, affecting the user experience.
[0029] In view of this, an embodiment of the present application provides a capacitive pen, in which a starting device is designed to activate and turn on the capacitive pen, and by controlling the on and off of the first output terminal in the charging chip, that is, controlling the on and off of the external power supply circuit of the charging chip, the capacitive pen is turned on and off through the charging chip; in the present application, the starting device triggers the interrupt terminal in the charging chip to be in the first level state, so that when the capacitive pen is in the off state, the first output terminal of the charging chip is turned on to start the power supply, and the purpose of powering on can be achieved by directly starting the power supply through the starting device, avoiding the process that the capacitive pen needs to be charged and waited before it can be activated and turned on, simplifying the process of turning on the capacitive pen, allowing users to start the power more conveniently, and improving the convenience and efficiency of use.
[0030] See also Figure 1 , Figure 1 A schematic diagram of the overall structure of a capacitive stylus provided in an embodiment of the present application. The capacitive stylus includes: a battery 10; a charging chip 20, comprising a battery terminal 21, an interrupt terminal 22, and a first output terminal 23, with the battery terminal 21 connected to the battery 10; a power chip 30, connected to the first output terminal 23; and a starting device 40, connected to the interrupt terminal 22 and configured to output a first electrical level to the interrupt terminal 22. The first output terminal 23 is configured to conduct when the interrupt terminal 22 is at the first electrical level, thereby enabling the battery 10 to supply power to the power chip 30 via the charging chip 20.
[0031] In this application, the battery 10 supplies power to the power supply chip 30 via the charging chip 20. The functions of the charging chip 20 in the circuit include monitoring and controlling the charging process and preventing abnormalities in the charger or charging circuit. In addition, the charging chip 20 also has a communication function and can communicate with other devices to realize intelligent monitoring and control of the charging and discharging process. The power supply chip 30 is an integrated circuit used for power conversion and management. It can convert one form of power into another form of power to meet the power supply requirements of different electronic devices, such as DC-DC conversion, AC-DC conversion, and voltage regulation.
[0032] Specifically, the battery terminal 21 of the charging chip 20 is connected to the positive pole of the battery 10. The battery terminal 21 is the BATT port of the charging chip 20, which is used to charge the battery 10 and receive power from the battery 10; the interrupt terminal 22 of the charging chip 20 is connected to the starting device 40. The interrupt terminal 22 is the INT port of the charging chip. On the one hand, the interrupt terminal 22 is configured to output an interrupt signal to output the corresponding charging status, and on the other hand, it is configured to be associated with the conduction state of the first output terminal 23; the first output terminal 23 of the charging chip 20 is used to control the power output switch of the charging chip 20. The first output terminal 23 is the SYS port of the charging chip 20. By controlling the conduction and shutdown of the SYS port, the start-up and shutdown operations of the charging chip 20 supplying power to the power chip 30 can be realized, that is, the conduction and shutdown of the first output terminal 23 are controlled.
[0033] In some embodiments, the first level state is configured as a low level state, and the first output terminal 23 of the charging chip 20 is configured to be turned on under the low level signal of the interrupt terminal 22 when in the off state, that is, the charging chip can be activated by pulling the interrupt pin of the charging chip 20 low, so that the first output terminal 23 of the charging chip 20 is turned on, that is, the charging chip 20 is started to supply power to the power chip 30 to achieve the purpose of turning on the capacitive pen. After the first output terminal 23 of the charging chip 20 is turned on, the battery 10 supplies power to each device module in the capacitive pen through the charging chip 20 and the power chip 30.
[0034] In some embodiments, the starting device 40 includes a trigger device that is used to trigger the first electrical level. Specifically, the trigger device is an electronic device that detects or senses an external physical quantity or event and converts it into an electrical signal or control signal. In this application, by controlling the trigger device to output the first electrical level to the interrupt terminal 22, the first output terminal 23 of the charging chip 20 is turned on, thereby achieving the purpose of turning on the capacitive stylus.
[0035] In some embodiments, the capacitive stylus comprises a housing, and an activation device 40 is disposed on the outer wall of the housing. The activation device 40 disposed on the outer wall of the housing makes power-on operation more convenient. Simply by triggering the activation device 40, the first electrical level is quickly triggered, thereby activating the capacitive stylus. This avoids the need to search for the activation device 40 during use, providing a more direct and efficient operation method.
[0036] In some embodiments, the touch device can be one of a button, a photoelectric sensor, a touch sensor, and a pressure sensor; it can also be other touch devices, which can be specifically set according to actual design conditions, and this application does not impose any restrictions on this.
[0037] For example, taking the trigger device as a button, the button is installed on the outer wall of the pen housing of the capacitive stylus. When the button is pressed, a first electrical level is output to the interrupt terminal 22, thereby turning on the first output terminal 23 of the charging chip 20. The button can be a two-pin button, one pin connected to one contact of the button, and the other pin connected to another contact of the button. When the button is pressed, a conductive path is formed between the two contacts, thereby changing the state of the circuit. One pin is grounded, and the other pin is connected to the interrupt terminal 22, so that when the button is pressed, the first electrical level is output to the interrupt terminal 22, thereby turning on the first output terminal 23 of the charging chip 20, that is, starting the power supply and thus achieving the purpose of turning on the capacitive stylus. Similarly, other trigger devices are used based on the device startup method, so that the trigger device outputs a first electrical level to the interrupt terminal 22, thereby turning on the first output terminal 23 of the charging chip 20, thereby starting the power supply and thus achieving the purpose of turning on the capacitive stylus.
[0038] Through the above technical solution, the capacitive stylus is connected to the interrupt terminal 22 of the charging chip 20 via the starting device 40, so that the starting device 40 triggers the interrupt terminal 22 to the first level state. The first output terminal 23 is configured to conduct when the interrupt terminal 22 is in the first level state. In this way, the battery 10 supplies power to the power chip 30 through the charging chip 20, thereby turning on the capacitive stylus. By triggering the first level state of the interrupt terminal 22 by the starting device 40, the power supply function of the charging chip 20 can be directly activated without waiting for the charging process. This simplifies the startup process of the capacitive stylus, making it more convenient for users to start the device, improving convenience and efficiency. In addition, the starting device 40 is located on the pen housing of the capacitive stylus, and the user can directly activate the startup by triggering the starting device 40. This means that the user can quickly start the power supply without performing additional operations such as plugging in or unplugging the charging cable, making the capacitive stylus immediately usable.
[0039] See also Figure 2 , Figure 2A schematic diagram of an exemplary structure of a capacitive stylus provided in an embodiment of the present application. In some embodiments, the capacitive stylus further includes: a main control device 50 including a first input terminal 51 connected to the interrupt terminal 22 .
[0040] In the present application, the main control device 50 may adopt a main control chip, which may be used for the overall control and management of the entire charging process, and may coordinate the operation of various device modules in the charging system, such as the charging chip 20, to ensure that the charging process is carried out in accordance with predetermined procedures and safety specifications; the main control device 50 may also support various communication interfaces for data exchange or connection with other devices.
[0041] Specifically, the first input terminal 51 of the main control device 50 is connected to the interrupt terminal 22. The first input terminal 51 of the main control device 50 is used to receive signals. In this application, the interrupt terminal 22 of the charging chip 20 transmits the charging status signal to the main control device 50 through the first input terminal 51. The interrupt terminal of the charging chip 20 can send the charging status signal to the main control device 50. By connecting to the interrupt terminal, the main control device 50 can monitor the working status of the charging chip 20 in real time, including charging start, charging completion, charging abnormalities, etc.
[0042] See also Figure 3 , Figure 3 Another example structural diagram of a capacitive stylus provided in an embodiment of the present application. In some embodiments, the main control device 50 further includes a second output terminal 52 and a third input terminal 53, and the charging chip 20 further includes a second input terminal 24. The second output terminal 52 is connected to the second input terminal 24, and the third input terminal 53 is configured to receive a shutdown signal. The second output terminal 52 is configured to output a shutdown signal to the second input terminal 24. The first output terminal 23 is configured to shut down when the second input terminal 24 receives the shutdown signal, thereby disconnecting the charging chip 20 from the power chip 30.
[0043] In this application, the second output terminal 52 of the master control device 50 is connected to the second input terminal 24 via the SCL port of the master control device 50 and the SCL port of the charging chip 20. In this application, the master control device 50 and the charging chip 20 connect the second output terminal 52 and the second input terminal 24 via the I2C (Inter-IC) bus. Furthermore, in I2C communication, the SDA port of the master control device 50 is also connected to the SDA port of the charging chip 20, and the master control device 50 and the charging chip 20 communicate via two lines (SCL and SDA). The SCL line is used to transmit the clock signal, while the SDA line is used to transmit data. This communication method allows data to be transmitted from the master device to the slave device, and also allows the slave device to transmit data back to the master device, achieving bidirectional communication. Furthermore, in this application, the interrupt terminal 22 of the charging chip 20 transmits the charging status signal to the master control device 50 via the first input terminal 51. The master control device 50 can control the charging chip 20 through I2C communication to ensure that the charging process is carried out according to the predetermined procedures and safety specifications. The third input terminal 53 of the main control device 50 is an input pin for receiving a shutdown signal, which is a power-off signal. This shutdown signal can come from a host computer or other device module, such as a trigger device providing a shutdown signal. After receiving the shutdown signal, the third input terminal 53 transmits it to the charging chip 20 via I2C communication. The charging chip 20 then shuts off the first output terminal 23, stopping power supply and thus shutting down the capacitive stylus.
[0044] Through the above technical solution, a mechanism for shutting down a capacitive stylus is provided. By inputting a shutdown signal to the third input terminal 53 of the main control device 50, the charging chip 20 is turned off the first output terminal 23, thereby stopping the power supply. The shutdown signal received by the third input terminal 53 can come from a host computer or other device module, such as a trigger device providing a trigger shutdown signal, etc., and the shutdown operation can be performed based on demand, increasing the safety of use. For the shutdown mechanism of the capacitive stylus, an efficient and flexible operation method is provided, which enhances the convenience of use and the safety of the device. Users can choose to send a remote shutdown command through the host computer software or use a device (such as a physical button, touch sensor, etc.) to directly trigger the shutdown signal according to actual needs. This flexibility not only improves the user experience, but also ensures that a quick and safe shutdown operation can be achieved in different usage scenarios. In addition, when the device is not needed or needs to stop working urgently, the user can quickly cut off the power supply, effectively preventing safety hazards such as power waste, overheating, and even short circuit caused by long standby or accidental triggering. In addition, by controlling the on and off of the first output terminal 23 of the charging chip 20, the capacitive pen is turned on and off, so that the present application can trigger the output of the first level to the interrupt terminal 22 through the starting device 40, so that the first output terminal 23 of the charging chip 20 is turned on when the interrupt terminal 22 is in the first level state, which simplifies the process of starting the capacitive pen, allowing users to start it more conveniently, thereby improving the convenience and efficiency of use.
[0045] See also Figure 4 , Figure 4 This is another exemplary structural diagram of a capacitive stylus provided in an embodiment of the present application. In some embodiments, the capacitive stylus further includes: a battery protection device 60 comprising a first terminal 61, a second terminal 62, and a fourth input terminal 63, wherein the first terminal 61 is connected to the positive electrode of the battery 10, and the second terminal 62 is connected to the negative electrode of the battery 10; and a main control device 50 further including a third output terminal 54, which is connected to the fourth input terminal 63.
[0046] In the present application, the battery can be a lithium battery, and the battery protection device 60 can include a lithium battery protection chip. The lithium battery protection chip is used to ensure the safety and stability of the lithium battery during the charging and discharging process, and prevent problems such as overcharging, over-discharging, overcurrent, short circuit and abnormal temperature of the battery, thereby extending the battery life, improving battery performance, and ensuring the safety of the user. The VDD port of the lithium battery protection chip is configured to be connected to the first end 61, the GND port of the lithium battery protection chip is configured to be connected to the second end 62, and the VM port of the lithium battery protection chip is configured to be connected to the fourth input end 63. The third output end 54 of the main control device 50 is an output port. The third output end 54 of the main control device 50 can output a shutdown command. By pulling up the SM port of the lithium battery protection chip, the GND port and the VM port in the lithium battery protection chip are disconnected, thereby disconnecting the battery power supply path and stopping the power supply, thereby achieving the purpose of shutting down the capacitive stylus. The specific situation in which the main control device 50 shuts down through the battery protection device 60 can be set based on actual needs.
[0047] In some embodiments, the battery protection device 60 further includes: a first TVS tube and a second TVS tube. One end of the first TVS tube is connected to the first end 61, and one end of the second TVS tube is connected to the second end 62. The other ends of the first TVS tube and the second TVS tube are both grounded. Since the first end 61 is connected to the positive electrode of the battery 10 and the second end 62 is connected to the negative electrode of the battery 10, one end of the first TVS tube is connected to the positive electrode of the battery 10, and one end of the second TVS tube is connected to the negative electrode of the battery 10. If the battery protection device is touched during welding, there may be a risk of static electricity, which may damage the chip in the battery protection device. The TVS tube is connected to the circuit to provide anti-static protection. When electrostatic discharge occurs, the TVS tube will quickly turn on and direct the overvoltage to ground, improving the reliability and quality of the welding process. Please refer to Figure 7 , Figure 7The circuit diagram of the battery protection device provided in the embodiment of the present application. For example, the battery protection device 60 includes a lithium battery protection chip U1, a resistor R5, a resistor R6, a capacitor C6, a capacitor C7, a capacitor C8, a bidirectional TVS diode D2, and a bidirectional TVS diode D3, wherein the first TVS tube is a bidirectional TVS diode D2, the second TVS tube is a bidirectional TVS diode D3, the positive electrode VBAT+ of the battery 10 is respectively connected to one end of the bidirectional TVS diode D2 and one end of the resistor R5, the other end of the resistor R5 is respectively connected to one end of the capacitor C6 and the VDD port of the lithium battery protection chip U1, and the other end of the bidirectional TVS diode D2 is connected to The negative electrode VBAT- of the battery 10 is respectively connected to one end of the bidirectional TVS diode D3, the other end of the capacitor C6, one end of the capacitor C7, and the GND port of the lithium battery protection chip U1. The other end of the bidirectional TVS diode D3 is grounded, and the other end of the capacitor C7 is respectively connected to the EPAD port of the lithium battery protection chip U1, the VM port of the lithium battery protection chip U1, one end of the capacitor C8, one end of the resistor R6, and ground. The SM port of the lithium battery protection chip U1 is respectively connected to the other end of the capacitor C8, the other end of the resistor R6, and the third output terminal 54 of the main control device 50.
[0048] Through the above technical solution, the battery protection device 60 is used to ensure the safety and stability of the lithium battery during the charging and discharging process, preventing problems such as battery overcharging, over-discharging, overcurrent, short circuit, and abnormal temperature, thereby extending the battery life, improving battery performance, and ensuring user safety. In addition, the main control device 50 controls the battery protection device 60 through the fourth input terminal 63. Then, the main control device 50 can control the battery power supply path to disconnect and stop power supply based on the monitored status, thereby achieving the purpose of shutting down the capacitive stylus. Furthermore, the coordinated operation of the battery protection device 60 and the main control device 50 can effectively protect the lithium battery, provide a safe and stable power supply during the charging and discharging process, extend the battery life, improve the battery performance, and ensure user safety.
[0049] See also Figure 5 , Figure 5 This is another exemplary structural diagram of a capacitive stylus provided in an embodiment of the present application. In some embodiments, the capacitive stylus further includes a charging device 70, and the charging chip 20 further includes a fifth input terminal 25, the fifth input terminal 25 being connected to the charging device 70. The charging device 70 is configured to supply power to the power chip 30 through the first output terminal 23 when powered on.
[0050] Specifically, the charging device 70 can be a charging device such as a Type-C or wireless charging device for connecting to an external power source. Specifically, the charging chip 20 also includes a fifth input terminal 25 for connecting to the charging device 70, thereby allowing the external power source to supply power to the charging chip 20. The fifth input terminal 25 is the IN terminal of the charging chip 20 for receiving power input. When the charging device 70 is powered on, the capacitive stylus is in the charging state. During the charging process, power is supplied to the power chip 30 through the charging chip 20. The power supply is used to supply power to various device modules in the capacitive stylus through the power chip 30, including powering the main control device 50. Among them, when the charging device 70 is powered on, the first output terminal 23 of the charging chip 20 is in the on state.
[0051] In some embodiments, the charging device 70 is configured to charge the battery 10 through the battery terminal 21 when in a powered-on state.
[0052] Through the above technical solution, when the charging device 70 is powered on, power is supplied to the charging chip 20, and then two power supplies are output through the charging chip 20. One power supply is supplied to each device module in the capacitive pen through the power chip 30, so as to ensure that each functional module in the capacitive pen works normally and provides the required power; the other power supply is supplied to the battery 10, so as to ensure that the battery 10 is fully charged when the charging device 70 is powered on. It should be noted that when the charging device 70 is not powered on, the battery 10 supplies power to the charging chip 20 through the battery terminal 21. When the charging device 70 is powered on, the battery 10 is charged through the battery terminal 21, and the battery 10 does not supply power to the charging chip 20. Furthermore, when the charging device 70 is powered on, that is, the fifth input terminal 25 is connected to the power supply, the charging chip 20 transmits the charging status to the main control device 50 through the interrupt terminal 22, so that the main control device 50 can understand the charging status in real time, which helps the main control device 50 make corresponding control and management decisions.
[0053] Furthermore, the present application can achieve the purpose of shutting down the capacitive stylus by adopting a variety of methods and mechanisms. One of the methods is to input a shutdown signal to the third input terminal 53 of the main control device 50, thereby causing the charging chip 20 to shut down the first output terminal 23, thereby stopping the power supply; in addition, the battery protection device 60 can also be used to disconnect the power supply path of the battery 10 to stop the power supply. When the battery protection device 60 or the main control device 50 detects an abnormal state or the main control device 50 sends a corresponding instruction, it will cut off the battery power supply path, thereby stopping the power supply. This mechanism provides another reliable shutdown method to ensure the safety and stability of the battery. Through the above two methods, various design requirements can be met and multiple shutdown modes can be provided. According to specific needs, a suitable shutdown method can be selected to realize the shutdown operation of the capacitive stylus. In addition, when the charging chip 20 turns off the first output terminal 23, the starting device 40 can be used to turn on the first output terminal 23 and start the power supply. This method can provide convenience when it is necessary to restart the power supply. By operating the starting device 40, the power supply of the capacitive pen can be restarted; in addition, when the charging chip 20 turns off the first output terminal 23 and the battery power supply path is disconnected by the battery protection device 60, the charging device 70 can be powered on, so that the power supply in the capacitive pen is started to achieve the purpose of starting up. This mechanism provides multiple startup modes to meet the needs of different design solutions.
[0054] In some embodiments, the capacitive stylus further includes: a first capacitor and a second capacitor, wherein one end of the first capacitor and one end of the second capacitor are both connected to the fifth input terminal 25, and the other end of the first capacitor and the other end of the second capacitor are both grounded. Based on the connection between the fifth input terminal 25 and the charging device 70, one end of the first capacitor and one end of the second capacitor are both connected to the charging device 70. By grounding the first and second capacitors, the circuit's withstand voltage can be improved and the impact of interference current can be reduced, thereby improving system reliability and reducing interference.
[0055] See also Figure 6 , Figure 6The circuit diagram of the peripheral circuit of the charging chip provided in the embodiment of the present application. Exemplarily, the peripheral circuit of the charging chip 20 includes capacitor C1, capacitor C2, capacitor C3, capacitor C4, capacitor C5, resistor R1, resistor R2, resistor R3, variable resistor R4, and diode D1, wherein the first capacitor is capacitor C1, the second capacitor is capacitor C2, the fifth input terminal 25 of the charging chip 20 is respectively connected to one end of capacitor C1, one end of capacitor C2, and the charging device 70, the other end of capacitor C1 and the other end of capacitor C2 are both grounded, the power supply terminal VDD of the charging chip 20 is respectively connected to one end of capacitor C3, one end of resistor R1, and one end of resistor R3, the power supply terminal of the charging chip 20 is the VDD port, the other end of capacitor C3 is grounded, the other end of resistor R3 is respectively connected to the battery temperature detection terminal of the charging chip 20 and a fixed port of the variable resistor R4, the other fixed port of the variable resistor R4 is grounded, and the battery temperature detection terminal of the charging chip 20 is NT C port, the interrupt terminal 22 of the charging chip 20 is respectively connected to the other end of the resistor R1, one end of the resistor R2, and the negative electrode of the diode D1. The interrupt terminal 22 of the charging chip 20 is the INT port. The other end of the resistor R2 is connected to the starting device 40. The positive electrode of the diode D1 is connected to the first input terminal 51 of the main control device 50. The ground terminal of the charging chip 20, namely the GND port, is grounded. The second input terminal 24 of the charging chip 20 is connected to the second output terminal 52 of the main control device 50. The second input terminal 24 of the charging chip 20 is the SDA port. The battery terminal 21 of the charging chip 20 is respectively connected to the positive electrode of the battery and one end of the capacitor C4. The battery terminal 21 of the charging chip 20 is the BATT port. The other end of the capacitor C4 is grounded. The first output terminal 23 of the charging chip 20 is respectively connected to one end of the capacitor C5 and the power chip 30. The other end of the capacitor C5 is grounded. The first output terminal 23 of the charging chip 20 is the SYS port. Among them, the second output terminal 52 of the main control device 50 communicates with the second input terminal 24 through the I2C bus. It should be understood that this bus uses two signal lines for data transmission, namely SDA (serial data line) and SCL (serial clock line), and then the SCL port of the charging chip 20 is connected to the main control device 50.
[0056] Accordingly, this application also proposes an electronic device assembly, comprising: an electronic device including a display screen, and the capacitive stylus of the above embodiment. Therefore, this electronic device assembly includes all the technical features and beneficial effects of the capacitive stylus, which will not be further elaborated in this application.
[0057] For example, the capacitive stylus according to the embodiment of the present application can be applied to electronic devices such as smart phones, tablet computers, touch-screen laptops, and e-readers.
[0058] The above is a detailed introduction to a capacitive stylus provided by the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of the present application. At the same time, for those skilled in the art, based on the idea of the present application, there may be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.
Claims
1. A capacitive stylus, characterized in that: include: Battery; A charging chip, comprising a battery terminal, an interrupt terminal, and a first output terminal, wherein the battery terminal is connected to the battery; a power chip connected to the first output end; A starting device is connected to the interrupt end, and the starting device is used to output a first electrical level to the interrupt end. The first output end is configured to be turned on when the interrupt end is in the first electrical level state, so that the battery supplies power to the power chip through the charging chip.
2. The capacitive stylus according to claim 1, wherein: Also includes: The main control device includes a first input terminal connected to the interrupt terminal.
3. The capacitive stylus according to claim 2, wherein: The main control device also includes a second output end and a third input end, the charging chip also includes a second input end, the second output end is connected to the second input end, the third input end is configured to receive a shutdown signal, the second output end is configured to output the shutdown signal to the second input end, and the first output end is configured to be turned off when the second input end receives the shutdown signal, so as to disconnect the charging chip from the power chip.
4. The capacitive stylus according to claim 2, wherein: Also includes: A battery protection device, comprising a first end, a second end, and a fourth input end, wherein the first end is connected to the positive electrode of the battery, and the second end is connected to the negative electrode of the battery; The main control device further includes a third output end, and the third output end is connected to the fourth input end.
5. The capacitive stylus according to claim 1, wherein: Also includes: Charging device, The charging chip further includes a fifth input terminal connected to the charging device. The charging device is configured to supply power to the power chip through the first output terminal when powered on.
6. The capacitive stylus according to claim 5, characterized in that: The charging device is configured to charge the battery through the battery terminal in a power-on state.
7. The capacitive stylus according to claim 4, characterized in that: The battery protection device further includes: a first TVS tube and a second TVS tube, one end of the first TVS tube is connected to the first end, one end of the second TVS tube is connected to the second end, and the other ends of the first TVS tube and the second TVS tube are both grounded.
8. The capacitive stylus according to claim 5, wherein: Also includes: A first capacitor and a second capacitor, one end of the first capacitor and one end of the second capacitor are both connected to the fifth input terminal, and the other end of the first capacitor and the other end of the second capacitor are both grounded.
9. The capacitive stylus according to claim 1, wherein: The starting device includes a triggering device, and the triggering device is used to trigger the first level.
10. The capacitive stylus according to claim 9, characterized in that: The touch device is one of a button, a photoelectric sensor, a touch sensor, and a pressure sensor.