Capacitance pen

Abstract

The utility model discloses a capacitance pen, and relates to the technical field of capacitance pens, the capacitance pen comprises a shell, and the interior of the shell is hollow; the circuit board is fixedly arranged in the shell, and a main control module and a first processor are arranged on the circuit board; the power supply module is fixedly arranged in the shell, and the power supply module is connected with the first processor and used for providing first voltage for the first processor; the main control module is connected with the first processor and is used for sending a modulation signal to the first processor; the first processor is used for boosting the first voltage into second voltage and processing the second voltage through the modulation signal so as to output working voltage used for driving a pen core of the capacitance pen. The capacitive pen aims to drive the refill of the capacitive pen, reduce circuit components and save the internal space of the capacitive pen.

Description

Technical Field

[0001] This application relates to the field of capacitive pen technology, and more particularly to a capacitive pen. Background Technology

[0002] In related technologies, the high-frequency modulation signal used to drive the pen tip of a capacitive pen is implemented by using a boost circuit plus a high-frequency modulation circuit. The boost circuit plus the high-frequency modulation circuit requires a large number of discrete components, making the circuit complex and space-consuming. Utility Model Content

[0003] The purpose of this application is to at least solve one of the technical problems existing in the prior art, and to provide a capacitive pen that aims to reduce the number of circuit components and save internal space of the capacitive pen while driving the pen tip.

[0004] This application provides a capacitive pen, including a housing, a circuit board, and a power supply module:

[0005] The shell is hollow inside;

[0006] The circuit board is fixedly disposed inside the housing, and the circuit board is provided with a main control module and a first processor;

[0007] The power supply module is fixedly disposed inside the housing, and the power supply module is connected to the first processor to provide a first voltage to the first processor.

[0008] The main control module is connected to the first processor and is used to send a modulation signal to the first processor; the first processor is used to boost the first voltage to a second voltage and process the second voltage through the modulation signal to output an operating voltage for driving the pen tip of the capacitive pen.

[0009] According to the technical solution of the embodiments of this application, at least the following beneficial effects are achieved: the power supply module provides a first voltage to the first processor, and the main control module also sends a modulation signal to the first processor. That is, both the first voltage and the modulation signal are sent to the first processor, and a single first processor device can complete the operation including boosting the first voltage to a second voltage and processing the second voltage through the modulation signal, without the need for boosting and modulation through a boost circuit containing a large number of components and a high-frequency modulation circuit. This greatly reduces the number of circuit components that need to be set on the circuit board, making the circuit board simpler and reducing its size, thereby saving internal space of the capacitive pen, reducing the overall weight of the capacitive pen, and allowing the battery inside the capacitive pen to have increased capacity, thereby improving the battery life of the capacitive pen.

[0010] According to some embodiments of this application, the power supply module includes a switching circuit and an energy storage unit. The switching circuit is connected to the energy storage unit, the main control module, and the first processor, respectively. The main control module is used to send a switching signal to the switching circuit to control the switching circuit to turn on and off, so that when the switching circuit is turned on, the energy storage unit provides a first voltage to the first processor through the switching circuit.

[0011] According to some embodiments of this application, the switching circuit includes a first resistor and a first transistor, one end of the first resistor is connected to the control pin of the first transistor, the other end of the first resistor is connected to the first switch pin of the first transistor, and the second switch pin of the first transistor is connected to the first processor.

[0012] According to some embodiments of this application, the main control module includes a first interface and a second interface. The main control module is connected to the first processor through the first interface and the second interface to send a first modulation signal to the first processor through the first interface and a second modulation signal to the first processor through the second interface. The modulation signal includes a first modulation signal and a second modulation signal with different frequencies.

[0013] According to some embodiments of this application, the main control module further includes a third interface, through which the main control module is connected to the first processor to send a voltage setting signal to the first processor for setting the output voltage amplitude of the first processor.

[0014] According to some embodiments of this application, the first modulation signal is a PWM square wave signal with a frequency of 471kHz and a duty cycle of 50%, and the second modulation signal is a PWM square wave signal with a frequency of 485kHz and a duty cycle of 50%.

[0015] According to some embodiments of this application, when the first modulation signal and the second modulation signal are low-level signals, the operating voltage output by the first processor is a positive voltage, and when the first modulation signal and the second modulation signal are high-level signals, the operating voltage output by the first processor is a negative voltage.

[0016] According to some embodiments of this application, the energy storage unit is a lithium battery, and the output voltage of the power supply module is in the range of 3V to 4.2V.

[0017] According to some embodiments of this application, a charging interface is provided on the housing, the charging interface is located away from the pen refill, and the charging interface is electrically connected to the power supply module.

[0018] According to some embodiments of this application, in the housing, the power supply module is disposed away from the battery cell, and the circuit board is disposed between the power supply module and the pen refill.

[0019] Other features and advantages of this application will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the application. The objectives and other advantages of this application may be realized and obtained by means of the structures particularly pointed out in the description, claims and drawings. Attached Figure Description

[0020] The accompanying drawings are used to provide a further understanding of the technical solutions of this application and constitute a part of the specification. They are used together with the embodiments of this application to explain the technical solutions of this application and do not constitute a limitation on the technical solutions of this application.

[0021] The present application will be further described below with reference to the accompanying drawings and embodiments;

[0022] Figure 1 This is a schematic block diagram of the structure of a capacitive pen provided in one embodiment of this application;

[0023] Figure 2 This is a circuit diagram of the boost circuit for a capacitive pen in the prior art;

[0024] Figure 3 This is a circuit diagram of the modulation circuit of a capacitive pen in the prior art;

[0025] Figure 4 This is a schematic block diagram of the structure of a capacitive pen provided in another embodiment of this application;

[0026] Figure 5 This is a circuit diagram of the power supply module in a capacitive pen provided in another embodiment of this application;

[0027] Figure 6 This is a schematic diagram showing the connection between the main control module and the first processor in a capacitive pen provided in another embodiment of this application. Detailed Implementation

[0028] This section will describe in detail the specific embodiments of this application. Preferred embodiments of this application are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of this application, but they should not be construed as limiting the scope of protection of this application.

[0029] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0030] In the description of this application, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If the terms "first" and "second" are used, they are merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly specifying the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0031] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0032] The present application will be further described below with reference to the accompanying drawings.

[0033] like Figure 1 As shown, Figure 1 This is a schematic block diagram of a capacitive pen provided in one embodiment of this application. The capacitive pen includes a housing, a circuit board, and a power supply module.

[0034] The shell is hollow inside;

[0035] The circuit board is fixedly installed inside the housing, and the main control module and the first processor are mounted on the circuit board.

[0036] The power supply module is fixedly installed inside the housing and is connected to the first processor to provide the first voltage to the first processor;

[0037] The main control module is connected to the first processor and is used to send a modulation signal to the first processor; the first processor is used to boost the first voltage to a second voltage and process the second voltage through the modulation signal to output the working voltage for driving the pen tip of the capacitive pen.

[0038] As is understandable, the working principle of a capacitive stylus is based on the touch mechanism of a capacitive screen. It changes the screen's electric field by simulating the conductivity of human fingers, thus being recognized as a touch signal. A capacitive stylus typically uses an internal circuit board with a drive control circuit to output the operating voltage for driving the stylus tip. This drive control circuit usually includes a boost circuit and a modulation circuit. The boost circuit raises the low voltage of the battery to a high voltage sufficient to drive the stylus tip and generate a strong electric field, while the modulation circuit modulates the signal at a high frequency to avoid interference with other electronic devices (such as display noise). Through the combination of the boost and modulation circuits, the capacitive stylus's drive control circuit can output the operating voltage to drive the stylus tip.

[0039] In addition, the boost circuit and modulation circuit of a capacitive pen typically include multiple components; for example, refer to Figure 2 , Figure 2 This is a circuit diagram of a boost circuit for a capacitive pen in the prior art. It includes a boost chip U4, capacitors C11, C19, C2, and C4, an inductor L1, resistors R4 and R14, and a voltage regulator module D5 with multiple Zener diodes. In other words, the boost circuit contains nine different components. (Reference) Figure 3 , Figure 3 This is a circuit diagram of the modulation circuit of a capacitive pen in the prior art. It includes a modulation module Q3 with multiple transistors, resistors R18 and R17, capacitors C5 and C13. That is to say, the modulation circuit contains 5 different components. It can be seen that the combination of boost circuit and modulation circuit includes 14 different components, resulting in a large number of components, complex circuit and large space occupation of the capacitive pen circuit board.

[0040] In this embodiment, the circuit board inside the capacitive pen's casing includes a drive control circuit. This drive control circuit comprises a main control module and a first processor. The first processor boosts a first voltage to a second voltage and processes the second voltage through a modulation signal to output a working voltage for driving the pen's core. In other words, the first processor can boost the first voltage from the power supply module to obtain the second voltage, and then modulate the second voltage through a modulation signal to create a working voltage for driving the pen's core, which is then output to the pen's core. Thus, the first processor integrates boost and modulation functions. Therefore, the functions of a boost circuit and modulation circuit, comprising 14 different components, can be achieved with just this single device. This significantly reduces the number of circuit components required on the pen's circuit board, making the board simpler and smaller, saving internal space and reducing the overall weight of the pen. This allows for increased battery capacity and improved battery life. In this embodiment, the working voltage for driving the pen's core has the same frequency and duty cycle as the modulation signal.

[0041] It is understandable that the working voltage of the pen tip used to drive the capacitive pen refers to the voltage sent by the first processor to the pen tip to generate a strong electric field at the pen tip. In this embodiment, the working voltage of the pen tip can be between 5V and 20V. The power supply module of the capacitive pen usually includes a 1.5V alkaline battery or a 3.7V lithium battery. The voltage of the power supply module is not enough to directly drive the pen tip to generate a sufficiently strong electric field. Therefore, it is necessary to boost the first voltage of the power supply module to a second voltage suitable for touch control.

[0042] In this embodiment, the first processor integrates boost and modulation functions. The first processor can be a highly integrated driver control chip, which may include a boost converter, a signal modulation module, a logic control unit, and possible communication interfaces. Through the various units or modules in the highly integrated driver control chip, the low voltage of the power supply module can be boosted to a second voltage suitable for driving the pen tip via the built-in boost converter, and the second voltage can be modulated into an operating voltage with the same frequency and duty cycle as the modulation signal via the signal modulation module, ensuring that the output electric field can be stably recognized by the capacitive screen. In one embodiment, the driver control chip may also integrate modules such as touch detection, power management, or pressure sensor interfaces to support more complex functions, such as tilt recognition or wireless charging.

[0043] In this embodiment, the main control module of the capacitive pen can be a microcontroller (MCU). The main control module may include a signal generation unit, a communication interface, a timer, etc. The main control module is mainly used to generate a modulation signal and send it to the first processor through a digital or analog interface. The first processor then boosts and modulates the signal to drive the pen tip. In one embodiment, the main control module may also integrate Bluetooth functionality for synchronizing data with paired devices or implementing additional control.

[0044] In some embodiments of the capacitive pen provided in this application, such as Figure 4 As shown, Figure 4 This is a schematic block diagram of the structure of a capacitive pen provided in another embodiment of this application. The power supply module includes a switching circuit and an energy storage unit. The switching circuit is connected to the energy storage unit, the main control module and the first processor respectively. The main control module is used to send a switching signal to the switching circuit to control the switching circuit to turn on and off, so that when the switching circuit is on, the energy storage unit provides a first voltage to the first processor through the switching circuit.

[0045] Understandably, the power supply module is mainly used to provide a first voltage to the first processor when the capacitive pen is powered on, so that the first processor can output the working voltage to drive the pen tip, enabling the capacitive pen to work normally. Based on this, the power supply module includes a switching circuit and an energy storage unit. The energy storage unit serves as a power supply unit, while the switching circuit serves as a circuit to control the on / off state of the power supply module's output. It enables the energy storage unit to supply power to the first processor normally when the capacitive pen is powered on, and stops the energy storage unit from supplying power to the first processor when the capacitive pen is powered off.

[0046] In this embodiment, the switching circuit is connected to the energy storage unit, the main control module, and the first processor, respectively. The two ends of the switching circuit are connected to the energy storage unit and the first processor, respectively. Therefore, when the switching circuit is in the ON state, the power transmission path between the energy storage unit and the first processor is open, and the voltage of the energy storage unit can be sent to the first processor through the switching circuit. When the switching circuit is in the OFF state, the power transmission path between the energy storage unit and the first processor is closed, and the voltage of the energy storage unit cannot be sent to the first processor. Here, the switching state of the switching circuit is controlled by the main control module, which connects to the switching circuit through an interface different from the interface connected to the first processor. When the main control module receives a power-on command from the capacitive pen, it can control the switching circuit to be turned on.

[0047] In this embodiment, the command to power on the capacitive pen received by the main control module can come from a physical button connected to the main control module. By pressing and holding the physical button, a command to power on or power off the capacitive pen can be sent to the main control module.

[0048] In some embodiments of the capacitive pen provided in this application, such as Figure 5 As shown, Figure 5 This is a circuit diagram of the power supply module in a capacitive pen provided in another embodiment of this application. The switching circuit includes a first resistor R10 and a first transistor Q10. One end of the first resistor R10 is connected to the control pin of the first transistor Q10, and the other end of the first resistor R10 is connected to the first switch pin of the first transistor Q10. The second switch pin of the first transistor Q10 is connected to the first processor.

[0049] In this embodiment, the switching circuit includes a first resistor R10 and a first transistor Q10. One end of the first resistor R10 is connected to the control pin of the first transistor Q10 and the main control module. That is, the control pin of the first transistor Q10 is connected to the main control module, and the main control module can control the first transistor Q10 through the control pin. For example, by setting the level at the control pin of the first transistor Q10, the switching on and off of the first transistor Q10 is controlled, thereby controlling the switching circuit. The other end of the first resistor R10 is connected to the first switch pin of the first transistor Q10 and the energy storage unit. The second switch pin of the first transistor Q10 is connected to the first processor. In other words, the energy storage unit and the first processor are connected through the first switch pin and the second switch pin of the first transistor Q10. When the first transistor Q10 is in the on state, the power path between the first switch pin and the second switch pin of the first transistor Q10 is conducted, thereby conducting the power path between the energy storage unit and the first processor.

[0050] In this embodiment, reference Figure 5 The first transistor can be a P-type field-effect transistor (FET). The gate of the P-type FET Q10 is connected to the VB_EN interface of the main control module, the drain of the P-type FET Q10 is connected to the power supply terminal VBAT of the energy storage unit, and the source of the P-type FET Q10 is connected to the voltage input terminal VBAT_OUT of the first processor. After the capacitive pen is powered on, the main control module receives a power-on command and can control VB_EN to be low, so that the P-type FET Q10 is turned on. The VBAT_OUT signal, i.e., the first voltage, is output through the source of the P-type FET Q10. If the main control module does not receive a power-on command, it can control VB_EN to be high, so that the P-type FET Q10 is not turned on, and the VBAT_OUT signal will not be output through the source of the P-type FET Q10. Since the first processor does not receive the first voltage, it will not output the working voltage used to drive the pen tip of the capacitive pen.

[0051] In some embodiments of the capacitive pen provided in this application, such as Figure 6 As shown, Figure 6This is a schematic diagram of the connection between the main control module and the first processor in a capacitive pen according to another embodiment of this application. The main control module includes a first interface HV_TIP and a second interface HV_RING. The main control module is connected to the first processor through the first interface HV_TIP and the second interface HV_RING, so as to send a first modulation signal to the first processor through the first interface HV_TIP and send a second modulation signal to the first processor through the second interface HV_RING. The modulation signals include the first modulation signal and the second modulation signal with different frequencies.

[0052] Understandably, a capacitive stylus tip can output two different frequencies of voltage to more accurately simulate finger touch and enhance anti-interference capabilities. This is because capacitive screens recognize touch by detecting changes in the electric field. In other words, the capacitive screen detects changes in the electric field at a specific frequency during scanning. Different frequency signals help the screen distinguish between the input from the capacitive stylus and ambient noise. Therefore, the capacitive stylus tip can output two different frequencies of voltage. One frequency can be used for basic touch positioning to ensure that the screen can stably detect the position of the stylus tip. The other frequency may be used to transmit additional information, such as pressure or tilt angle, allowing the screen to recognize more complex writing states. At the same time, the dual-frequency design can also avoid interference with the display refresh rate or other electronic devices, resulting in smoother writing and lower latency.

[0053] Based on this, in this embodiment, the main control module can send two modulation signals of different frequencies to the first processor. The first processor can perform signal modulation using the two different modulation signals, thereby outputting two different frequencies of working voltage for driving the pen core of the capacitive pen.

[0054] In this embodiment, the main control module includes a first interface HV_TIP and a second interface HV_RING. The main control module is connected to the first processor through the first interface HV_TIP and the second interface HV_RING. Both the first interface HV_TIP and the second interface HV_RING are used to provide modulation signals to the first processor. Specifically, the main control module sends a first modulation signal to the first processor through the first interface HV_TIP and a second modulation signal to the first processor through the second interface HV_RING. After receiving the first modulation signal and the second modulation signal, the first processor can process a second voltage based on the first modulation signal and the second modulation signal, respectively, so that the operating voltage output by the first processor includes an operating voltage based on the first modulation signal and an operating voltage based on the second modulation signal. In addition, it can be understood that the first processor also includes a first port TX1 and a second port TX2 corresponding to the first interface HV_TIP and the second interface HV_RING, respectively. The first interface HV_TIP is connected to the first port TX1, and the second interface HV_RING is connected to the second port TX2.

[0055] In some embodiments of the capacitive pen provided in this application, such as Figure 6 As shown, the main control module also includes a third interface, through which the main control module connects to the first processor to send a voltage setting signal to the first processor for setting the output voltage amplitude of the first processor.

[0056] Understandably, the output voltage amplitude of a capacitive stylus tip needs to be precisely set to balance touch sensitivity and power consumption. A higher voltage amplitude creates a stronger electric field at the tip, making it easier for the capacitive screen to detect the signal, thus improving touch accuracy and response speed. However, excessively high voltage increases power consumption, shortens battery life, and may even interfere with the normal operation of the screen. Conversely, a voltage amplitude that is too low will result in a weak signal, and the screen may not be able to stably recognize the pen touch, leading to touch drops or delays. Therefore, it is necessary to adjust the voltage amplitude appropriately to ensure that the capacitive stylus works stably on different devices and optimizes power consumption.

[0057] In this embodiment, the main control module further includes a third interface GPIO. The main control module includes multiple third interface GPIOs, and correspondingly, the first processor also includes multiple third ports corresponding to the multiple third interface GPIOs. In this embodiment, the third ports of the first processor include the SCL_RV port, the SDIO port, the CS port, and the RTS port. The main control module includes four third interface GPIOs, which correspond to the four third ports of the first processor respectively. Through the third interface of the main control module and the third ports of the first processor, the main control module can send a voltage setting signal to the first processor to set the output voltage amplitude of the first processor.

[0058] In some embodiments of the capacitive pen provided in this application, the first modulation signal is a PWM square wave signal with a frequency of 471kHz and a duty cycle of 50%, and the second modulation signal is a PWM square wave signal with a frequency of 485kHz and a duty cycle of 50%.

[0059] Understandably, the two similar but different frequencies of 471kHz and 485kHz can cover the operating frequency band of most capacitive screens, ensuring that the pen tip signal can be stably recognized by devices from different manufacturers and avoiding touch failure caused by differences in screen scanning frequency; a duty cycle of 50% can make the square wave signal symmetrical, reduce harmonic interference and optimize electric field coupling efficiency, making it easier for the screen to accurately resolve the pen touch position.

[0060] In some embodiments of the capacitive pen provided in this application, when the first modulation signal and the second modulation signal are low-level signals, the operating voltage output by the first processor is a positive voltage, and when the first modulation signal and the second modulation signal are high-level signals, the operating voltage output by the first processor is a negative voltage.

[0061] Understandably, in order for the tip of the capacitive stylus to generate a sufficiently strong electric field to trigger the response of the capacitive screen, an AC voltage is usually required. That is, the tip of the capacitive stylus needs to output positive and negative voltages at specific frequencies, which can be more effectively coupled to the sensing layer of the capacitive screen to simulate the electric field changes when a finger touches it.

[0062] In this embodiment, the main control module can send two different frequency modulation signals, namely a first modulation signal and a second modulation signal, to the first processor. When the first modulation signal and the second modulation signal are low-level signals, the operating voltage output by the first processor is a positive voltage, and when the first modulation signal and the second modulation signal are high-level signals, the operating voltage output by the first processor is a negative voltage. In this way, the operating voltage output by the first processor to drive the pen tip of the capacitive pen includes both positive and negative voltages, thereby generating a sufficiently strong electric field at the tip of the capacitive pen.

[0063] In some embodiments of the capacitive pen provided in this application, the energy storage unit is a lithium battery, and the output voltage of the power supply module ranges from 3V to 4.2V.

[0064] In this embodiment, the energy storage unit can be a lithium battery. Considering the small size of the capacitive pen, the energy storage unit can be a single lithium battery, and the voltage range of the lithium battery is 3V to 4.2V.

[0065] In some embodiments of the capacitive pen provided in this application, a charging interface is provided on the shell, the charging interface is located away from the pen tip, and the charging interface is electrically connected to the power supply module.

[0066] It is understood that, in addition to providing the first voltage to the first processor, the power supply module can also be used to power the main control module and other electronic components in the capacitive pen. In one embodiment, the power supply module may include energy storage components such as batteries, which power the capacitive pen. The power supply module may also include a charging circuit, which powers the capacitive pen through an external charger and charging circuit. Thus, the capacitive pen can be powered by the energy storage components such as batteries in the power supply module, or by an external charger and charging circuit, and the energy storage components such as batteries in the power supply module can also be charged through an external charger and charging circuit.

[0067] In this embodiment, a charging interface may be provided on the housing. The charging interface is electrically connected to the power supply module. The user can power the capacitive pen through an external charger and the charging interface. In one embodiment, the power supply module includes an energy storage unit. The user can also charge the energy storage unit in the power supply module through an external charger and the charging interface.

[0068] It is important to note that the charging port of a capacitive pen is located away from the pen tip to reduce electromagnetic interference during charging that could affect the stability of the pen tip's signal transmission. This also prevents users from touching the metal interface while holding the pen, which could cause discomfort. The charging port is usually located near the end or side of the pen.

[0069] In some embodiments of the capacitive pen provided in this application, the power supply module is disposed away from the battery cell in the housing, and the circuit board is disposed between the power supply module and the pen cell.

[0070] In this embodiment, the power supply module is located away from the battery cell, which reduces electromagnetic interference from the power supply module to the pen tip signal and ensures the touch accuracy and stability of the capacitive pen. The circuit board is located between the power supply module and the pen tip, which can play a certain role in shielding. At the same time, it optimizes the internal space layout, making the center of gravity of the pen closer to the grip area and improving the writing feel.

[0071] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application.

[0072] In the several embodiments provided in this application, it should be understood that the disclosed systems, instruments, and methods can be implemented in other ways. For example, the instrument embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the shown or discussed mutual couplings, direct couplings, or communication connections may be through some interfaces; indirect couplings or communication connections between instruments or units may be electrical, mechanical, or other forms. Units described as separate components may or may not be physically separate, and components shown as units may or may not be physical units, i.e., they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0073] It should also be understood that the various implementation methods provided in this application can be combined arbitrarily to achieve different technical effects.

[0074] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application.

Claims

1. A capacitive pen, characterized in that, include: A housing, wherein the interior of the housing is hollow; A circuit board is fixedly disposed inside the housing, and the circuit board is provided with a main control module and a first processor; A power supply module is fixedly disposed inside the housing. The power supply module is connected to the first processor and is used to provide a first voltage to the first processor. The main control module is connected to the first processor and is used to send a modulation signal to the first processor; the first processor is used to boost the first voltage to a second voltage and process the second voltage through the modulation signal to output an operating voltage for driving the pen tip of the capacitive pen.

2. The capacitive stylus according to claim 1, characterized in that, The power supply module includes a switching circuit and an energy storage unit. The switching circuit is connected to the energy storage unit, the main control module, and the first processor. The main control module is used to send a switching signal to the switching circuit to control the switching circuit to turn on and off, so that when the switching circuit is on, the energy storage unit provides a first voltage to the first processor through the switching circuit.

3. The capacitive stylus according to claim 2, characterized in that, The switching circuit includes a first resistor and a first transistor. One end of the first resistor is connected to the control pin of the first transistor, and the other end of the first resistor is connected to the first switch pin of the first transistor. The second switch pin of the first transistor is connected to the first processor.

4. The capacitive stylus according to claim 1, characterized in that, The main control module includes a first interface and a second interface. The main control module is connected to the first processor through the first interface and the second interface to send a first modulation signal to the first processor through the first interface and a second modulation signal to the first processor through the second interface. The modulation signal includes a first modulation signal and a second modulation signal with different frequencies.

5. The capacitive stylus according to claim 4, characterized in that, The main control module also includes a third interface, through which the main control module is connected to the first processor to send a voltage setting signal to the first processor for setting the output voltage amplitude of the first processor.

6. The capacitive stylus according to claim 4, characterized in that, The first modulation signal is a PWM square wave signal with a frequency of 471kHz and a duty cycle of 50%, and the second modulation signal is a PWM square wave signal with a frequency of 485kHz and a duty cycle of 50%.

7. The capacitive stylus according to claim 6, characterized in that, When the first modulation signal and the second modulation signal are low-level signals, the operating voltage output by the first processor is a positive voltage; when the first modulation signal and the second modulation signal are high-level signals, the operating voltage output by the first processor is a negative voltage.

8. The capacitive stylus according to claim 2, characterized in that, The energy storage unit is a lithium battery, and the output voltage of the power supply module ranges from 3V to 4.2V.

9. The capacitive stylus according to claim 1, characterized in that, The housing has a charging interface, which is located away from the pen refill and is electrically connected to the power supply module.

10. The capacitive pen according to claim 1, characterized in that, Within the housing, the power supply module is positioned away from the battery cell, and the circuit board is disposed between the power supply module and the pen refill.

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