Stylus

Abstract

The present application discloses a stylus, which includes a charging circuit, a battery, a power management integrated circuit, and a reset circuit; the charging port of the charging circuit and the battery are both electrically connected to the power management integrated circuit through the reset circuit; wherein, the reset circuit is configured to, when the charging port is powered on, disconnect the path between the charging port and the power management integrated circuit and the path between the battery and the power management integrated circuit, and after a certain period of time, conduct the path between the charging port and the power management integrated circuit and the path between the battery and the power management integrated circuit. The above solution can solve the problem that the stylus cannot be automatically reset.

Description

Technical Field

[0001] This application belongs to the field of device terminals, and particularly relates to a stylus pen. Background Art

[0002] With the continuous update and iteration of electronic technologies, touch screen technologies are also constantly evolving. To improve the touch screen experience of users, stylus pens have started to appear as auxiliary input devices in various terminal devices. A stylus pen can accurately click on the screen area of an electronic device to implement various intelligent interaction functions, thereby increasing the user's usage interest and convenience.

[0003] In current stylus pens, a complete set of small system electronic circuits is included inside the stylus pen. Thus, during the specific working process, the stylus pen is prone to crashing, resulting in the failure of the stylus pen. Regarding this problem, although a reset program can be installed in the stylus pen for resetting, when the reset program has problems or the internal firmware of the power management integrated circuit (IC) is abnormal, the stylus pen cannot perform automatic reset. As a result, the user needs to power off the system or the power management IC and perform a deep hard reset to solve the problem. Summary of the Invention

[0004] The purpose of the embodiments of this application is to provide a stylus pen that can solve the problem of the stylus pen being unable to perform automatic reset.

[0005] To solve the above technical problems, this application is implemented as follows:

[0006] The embodiments of this application disclose a stylus pen, including a charging circuit, a battery, a power management integrated circuit, and a reset circuit; the charging port of the charging circuit and the battery are both electrically connected to the power management integrated circuit through the reset circuit; wherein, the reset circuit is configured to, when the charging port is powered on, disconnect the path between the charging port and the power management integrated circuit and the path between the battery and the power management integrated circuit, and after a certain period of time, conduct the path between the charging port and the power management integrated circuit and the path between the battery and the power management integrated circuit.

[0007] The technical solution adopted by this application can achieve the following beneficial effects:

[0008] The stylus disclosed in the embodiments of the present application includes a charging circuit, a battery, a power management integrated circuit, and a reset circuit; the charging port of the charging circuit and the battery are both electrically connected to the power management integrated circuit through the reset circuit; wherein, the reset circuit is electrically connected between the charging circuit and the power management integrated circuit, and the reset circuit is used to disconnect or conduct the path between the charging circuit and the power management integrated circuit. When the charging port is powered on, the path between the charging port and the power management integrated circuit and the path between the battery and the power management integrated circuit are disconnected, and after a certain period of time, the path between the charging port and the power management integrated circuit and the path between the battery and the power management integrated circuit are conducted. Thus, in the case of abnormal operation of the stylus, the path between the charging circuit and the power management integrated circuit can be disconnected first through the reset circuit, so that the power management integrated circuit and other modules in the stylus are powered off, and then the path between the charging circuit and the power management integrated circuit is conducted through the reset circuit, so that the power management integrated circuit and other modules in the stylus are powered on, thereby enabling the stylus to automatically reset, thus solving the problem that the stylus cannot automatically reset and requires the user to perform a deep hard reset to solve, and further enabling the stylus to continue to work normally. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 is a schematic structural diagram of a stylus disclosed in the embodiments of the present application;

[0010] Figure 2 is a schematic circuit diagram of a stylus disclosed in the embodiments of the present application;

[0011] Figure 3 is another schematic circuit diagram of a stylus disclosed in the embodiments of the present application;

[0012] Figure 4 is a schematic diagram of a capacitive discharge of a stylus disclosed in the embodiments of the present application;

[0013] Figure 5 is a schematic external structure diagram of a stylus disclosed in the embodiments of the present application;

[0014] Figure 6 is another schematic circuit diagram of a stylus disclosed in the embodiments of the present application;

[0015] Figure 7 is another schematic diagram of a capacitive discharge of a stylus disclosed in the embodiments of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0017] The terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present application can be implemented in an order different from those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of the same category, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the description and claims means at least one of the connected objects, and the character " / " generally indicates an "or" relationship between the associated objects before and after.

[0018] The stylus provided in the embodiments of the present application will be described in detail below with reference to the accompanying drawings through specific embodiments and their application scenarios.

[0019] Figure 1 The structural schematic diagram of a stylus disclosed in the embodiments of the present application is shown as Figure 1 shown. The stylus 100 may include: a charging circuit 110, a battery 120, a power management integrated circuit 130, and a reset circuit 140.

[0020] In an embodiment of the present application, the charging circuit 110 is used to provide power for the stylus 100 to ensure that the stylus 100 can work properly. The charging port of the charging circuit 110 and the battery 120 are both electrically connected to the power management integrated circuit 130 through the reset circuit 140. Among them, the reset circuit 140 is electrically connected between the charging circuit 110 and the power management integrated circuit 130, and the reset circuit 140 is used to disconnect or conduct the path between the charging circuit 110 and the power management integrated circuit 130. When the charging port is powered on, the path between the charging port and the power management integrated circuit 130 and the path between the battery 120 and the power management integrated circuit 130 are disconnected, and after a certain period of time, the path between the charging port and the power management integrated circuit 130 and the path between the battery 120 and the power management integrated circuit 130 are conducted. Thus, in the case where the stylus 100 has a working abnormality, the stylus 100 can be inserted into the charging port to power on the charging port of the charging circuit 110. The reset circuit 140 first disconnects the path between the charging circuit 110 and the power management integrated circuit 130, so that the power management integrated circuit 130 and other modules in the stylus 100 are powered off. Then, the reset circuit 140 conducts the path between the charging circuit 110 and the power management integrated circuit 130, so that the power management integrated circuit 130 and other modules in the stylus 100 are powered on, thereby enabling the stylus 100 to be automatically reset, thus solving the problem that the stylus cannot be automatically reset and requires the user to perform a deep hard reset to solve, and further enabling the stylus to continue to work properly.

[0021] In a possible implementation manner of the embodiment of the present application, the reset circuit 140 may include a first on-off module 141 and a second on-off module 142. Among them, the first on-off module 141 is electrically connected between the charging port and the power management integrated circuit 130, and is used to disconnect the first path between the charging port and the power management integrated circuit 130 when the charging port is powered on, and conduct the first path after a certain period of time. The second on-off module 142 is electrically connected between the battery 120 and the power management integrated circuit 130, and is used to disconnect the second path between the battery 120 and the power management integrated circuit 130 when the charging port is powered on, and conduct the second path after a certain period of time.

[0022] In this way, when the stylus 100 malfunctions, the first switching module 141 and the second switching module 142 respectively disconnect the path between the charging circuit 110 and the power management integrated circuit 130 and the path between the battery 120 and the power management integrated circuit 130, so that each circuit module of the stylus 100 is powered off. Then, the first switching module 141 and the second switching module 142 respectively conduct the path between the charging circuit 110 and the power management integrated circuit 130 and the path between the battery 120 and the power management integrated circuit 130, so that each circuit module of the stylus 100 is powered on, realizing the automatic reset circuit of the stylus 100.

[0023] In a possible solution, the reset circuit 140 may further include a capacitive element and a first resistive element. The first switching module 141 may include a first field effect transistor, and the second switching module 142 may include a second field effect transistor. Wherein, the drain of the first field effect transistor is electrically connected to the charging port, the source of the first field effect transistor is electrically connected to the power management integrated circuit 130, and the gate of the first field effect transistor is electrically connected to the first end of the capacitor. The drain of the second field effect transistor is electrically connected to the positive electrode of the battery 120, the source of the second field effect transistor is electrically connected to the power management integrated circuit 130, and the gate of the second field effect transistor is electrically connected to the first end of the capacitive element. The second end of the capacitive element is electrically connected to the charging port of the charging circuit 110, that is, the voltage of the gates of the first field effect transistor and the second field effect transistor can be pulled up to the voltage of the charging port of the charging circuit 110 through the capacitive element. One end of the first resistive element is electrically connected to the gates of the first field effect transistor, the second field effect transistor and the first end of the capacitive element respectively, and the other end of the first resistive element and the negative electrode of the battery 120 are both grounded.

[0024] In the above possible implementation, the first field effect transistor and the second field effect transistor may both be enhancement-mode P-type field effect transistors (PMOS). For example, in Figure 2 In the shown circuit structure, the first field effect transistor is PMOS1, the second field effect transistor is PMOS2. The gates of PMOS1 and PMOS2 are electrically connected to the charging port of the charging circuit 110 through a capacitor C (i.e., the capacitive element). In addition, the gates of PMOS1 and PMOS2 are electrically connected to the negative electrode of the battery 120 through a resistor R (i.e., the first resistive element). The first path (i.e., the path between the charging port of the charging circuit 110 and the power management integrated circuit 130) and the second path (i.e., the path between the positive electrode of the battery and the power management integrated circuit 130) can be respectively controlled to be turned on and off through the first field effect transistor and the second field effect transistor.

[0025] In another possible implementation, the reset circuit 140 may further include a second resistor element. The first switching module 141 may include a path switching switch, and the second switching module 142 may include a third field effect transistor. The reset circuit 140 may further include a second resistor element. Wherein, the first end of the path switching switch is electrically connected to the charging port, the second end of the path switching switch is electrically connected to the power management integrated circuit 130, the third end of the path switching switch is electrically connected to the gate of the third field effect transistor, and the path switching switch is controlled to connect the path between the first end and the second end (i.e., the above-mentioned first path) or connect the path between the first end and the third end; the drain of the third field effect transistor is electrically connected to the positive electrode of the battery 120, and the source of the third field effect transistor is electrically connected to the power management integrated circuit; one end of the second resistor element is electrically connected to the gate of the third field effect transistor and the third end of the path switching switch respectively, and the other end of the second resistor element and the negative electrode of the battery 120 are both grounded. That is to say, in this possible implementation, the path switching switch is a selection switch, which can select to connect the path between its first end and the second end, disconnect the path between the first end and the third end, or select to connect the path between its first end and the third end, disconnect the path between the first end and the first end, so as to control the voltage of the gate of the third field effect transistor, and further control the third field effect transistor to conduct or cut off, that is, control the conduction or disconnection of the above-mentioned second path. For example, in Figure 3 In the circuit structure of the stylus shown, the path switching switch is the button S, and the third field effect transistor is a PMOS transistor.

[0026] In a possible implementation, the charging circuit 110 may include a charging feed point and a ground feed point, and the first path is the path between the charging feed point and the power management integrated circuit 130. The ground feed point is electrically connected to the negative electrode of the battery 120.

[0027] For example, in Figure 2 , PMOS1 is used to control the on-off of the first path between the VBUS charging feed point and the PMIC, and PMOS2 is used to control the on-off of the second path between the positive electrode of the battery 120 and the PMIC. In a specific application, when the stylus 100 has a functional abnormality and cannot communicate, the terminal connected to the stylus 100 can prompt the user to insert the stylus 100 into the charging slot. After the stylus 100 is inserted, the charging feed point of the stylus 100 contacts the VBUS output elastic piece of the terminal, the charging feed point is powered on, the capacitive element C is charged, and after a period of time, the capacitor C discharges, and then VBUS is output.

[0028] Among them, in the initial state (i.e., when the stylus 100 is just connected to the charging slot), the capacitive element C is not charged, the voltage difference between the first end and the second end of the capacitive element is 0, the gate voltages of PMOS1 and PMOS2 are VBUS, and the gate-source voltage VGS of PMOS1 and PMOS2 is greater than 0. According to the conduction principle of the field effect transistor, PMOS1 and PMOS2 are cut off, disconnecting the first path and the second path, and the subsequent circuit module of the stylus 100 (for example, Figure 2 the PMIC, MCU, and peripherals therein) is powered off and reset. As the charge of the capacitive element C accumulates continuously, a voltage difference appears between the first end and the second end of the capacitive element C (i.e., between the positive and negative plates), and the gate voltages of PMOS1 and PMOS2 decrease. When the gate voltages of PMOS1 and PMOS2 decrease to the gate-source voltage VGS less than the minimum turn-on voltage VGS(th), according to the conduction principle of the field effect transistor, PMOS1 and PMOS2 conduct, thereby making the first path and the second path conduct, and the subsequent circuit module of the stylus 100 (for example, Figure 2 the PMIC, MCU, and peripherals therein) resumes power supply, and the stylus 100 continues to work normally.

[0029] In the case where the stylus 100 is inserted into the charging slot of the stylus again after use, the VBUS charging feed point will remain grounded for a period of time, as Figure 4 shown, the capacitor C can be fully discharged through the VBUS charging feed point, the ground feed point, and the resistor R. When the VBUS charging feed point is powered on, the reset circuit 140 can implement the reset operation again.

[0030] In the above possible implementation, by adding a power-off reset logic in the stylus 100, the stylus 100 can implement the function of deep hard reset in the charging state. Moreover, in this possible implementation, there is no need to add an external interface to the stylus 100 additionally. By adding a hard reset circuit on the basis of the original structure, when the stylus 100 has a function failure, the user is guided to insert the stylus 100 into the charging slot, and the charging feed contacts the VBUS output elastic piece of the intelligent terminal, and after completing the reset action, the normal function of the stylus 100 can be restored.

[0031] For another example, in the circuit structure of the stylus 100 shown in Figure 3 , an enhanced PMOS is added between the battery 120 and the PMIC of the stylus 100 respectively. The gate of this PMOS is pulled down to GND through a resistor R, and a path switching switch is added to the path between the VBUS charging feed point and the PMIS. Among them, the path switching switch can be manifested as a multi-functional button structure on the stylus 100 (this multi-functional button can reuse the original structure of the stylus). When the button is not pressed, the path switching remains in path 1, and when pressed, it switches to path 2.

[0032] When the stylus 100 malfunctions and cannot communicate properly, the terminal connected to the stylus 100 can prompt the user to insert the stylus 100 back into the stylus storage slot (i.e., the charging slot). When the stylus 100 is not in the charging position, the charging feed point of the terminal is not powered and is connected to GND to prevent corrosion. When it is detected that the stylus 100 is inserted / in place, the charging feed point of the terminal outputs VBUS; after VBUS is output, pressing the path switching switch can switch the path from 1 to 2, disconnecting the power supply from the VBUS charging feed point to the PMIC; at the same time, the gate voltage of the PMOS is VBUS, so that VGS>0, the PMOS transistor is turned off, disconnecting the power supply from the positive electrode (VBAT) of the battery 120 to the PMIC, so that each lower-level circuit module of the stylus 100 is powered off and reset. After releasing the button, the path switching switch rebounds to path 1, the PMOS conducts, the power supply of the stylus 100 is restored, and the circuit works normally.

[0033] In the above possible implementation, when the stylus 100 is pulled out from the charging slot and the stylus 100 can work normally, there is no input to the VBUS charging feed point. Therefore, the multifunctional button externally represented by the path switching switch can be freely configured for other functions, and switching the path to 2 when pressing will not affect the power supply of the system by the VBAT path.

[0034] Such as Figure 5 shown, the above multifunctional button can be set at the pen tip of the stylus 100 to save the space occupied by the stylus 100 in the radial direction.

[0035] In another possible implementation, the charging circuit 110 may include an electromagnetic induction coil and a rectifying circuit. In this possible implementation, the input end of the rectifying circuit is electrically connected to the electromagnetic induction coil, and the output end of the rectifying circuit is the above charging port. The rectifying circuit can rectify the input alternating current to output direct current. That is to say, in this possible implementation, the stylus 100 can be charged through the electromagnetic induction coil, that is, the stylus 100 is charged in a wireless charging manner.

[0036] In the above possible implementation, the rectifying circuit can be any rectifying circuit, for example, a bridge rectifying circuit or a zero rectifying circuit, etc. Specifically, the embodiments of the present application do not make limitations.

[0037] In the above possible implementation manners, when the stylus 100 is charged by wireless charging, if the first on-off module 141 includes a first field-effect transistor and the second on-off module 142 includes a second field-effect transistor, the reset circuit 140 may further include a diode. The negative electrode of the diode is electrically connected to the gate of the first field-effect transistor, the gate of the second field-effect transistor, and the first end of the capacitive element respectively, and the anode of the diode and the negative electrode of the battery 120 are both grounded, that is, the diode and the first resistive element are connected in parallel between the connection point and the ground. The connection point is the connection point of the gate of the first field-effect transistor, the gate of the second field-effect transistor, and the first end of the capacitive element. According to the principle that the forward resistance of the diode is small and the reverse resistance is large, a way can be provided for discharging the capacitive element.

[0038] For example, in Figure 6 , an enhanced PMOS1 and PMOS2 are respectively added between the rectifying circuit and the battery of the stylus 100 and the PMIC. The gate voltages of PMOS1 and PMOS2 can be pulled up to the VBUS charging feed point through a capacitor C and pulled down to GND through a resistor R. A diode D is connected in parallel with the resistor R. When the stylus 100 has a functional abnormality and cannot communicate, the terminal connected to the stylus 100 can prompt the user to insert the stylus 100 into the charging slot. When the stylus 100 is not in the charging position, the charging coil of the terminal does not output to save power consumption. When it is detected that the stylus 100 is in position, the terminal outputs, and the stylus end is converted and output as VBUS through the rectifying circuit. Therefore, after the stylus 100 is inserted, VBUS is powered on, the capacitor C is charged, and the capacitor C is discharged after a period of time, and then VBUS is output.

[0039] Among them, after the stylus 100 is inserted, in the initial state, the capacitor C is not charged, the voltage difference between the positive and negative plates is 0, the gate voltages of the two PMOS transistors are VBUS, and VGS>0. The two PMOS transistors are turned off to realize the power-down reset of all subsequent circuits. As the charge of the capacitor accumulates continuously, a voltage difference appears between the positive and negative plates of the capacitor C, and the gate voltages of the two PMOS transistors decrease. When VGS<VGS(th) is satisfied, PMOS1 and PMOS2 are turned on, and the subsequent system resumes power supply.

[0040] After the stylus 100 is pulled out and used, the electromagnetic coil does not receive electric energy, the output of the rectifying circuit is floating, and the capacitor C can be fully discharged through the Figure 7 shown path, and the reset action can be realized again after VBUS is powered on.

[0041] The embodiments of the present application have been described above in conjunction with the accompanying drawings. However, the present application is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present application, those of ordinary skill in the art can also make many forms without departing from the purpose of the present application and the scope protected by the claims, and all of them belong to the protection scope of the present application.

Claims

1. A stylus pen, characterized in that, it includes a charging circuit, a battery, a power management integrated circuit, and a reset circuit; the charging port of the charging circuit and the battery are both electrically connected to the power management integrated circuit through the reset circuit; wherein, the reset circuit is used to disconnect the path between the charging port and the power management integrated circuit and the path between the battery and the power management integrated circuit when the charging port is powered on, and after a certain time, conduct the path between the charging port and the power management integrated circuit and the path between the battery and the power management integrated circuit; the reset circuit includes a first on-off module and a second on-off module, wherein, the first on-off module is electrically connected between the charging port and the power management integrated circuit, and is used to disconnect the first path between the charging port and the power management integrated circuit when the charging port is powered on, and conduct the first path after a certain time; the second on-off module is electrically connected between the battery and the power management integrated circuit, and is used to disconnect the second path between the battery and the power management integrated circuit when the charging port is powered on, and conduct the second path after a certain time; wherein, the reset circuit further includes a capacitor element and a first resistor element; the first on-off module includes a first field effect transistor; the second on-off module includes a second field effect transistor; wherein, the drain of the first field effect transistor is electrically connected to the charging port, the source of the first field effect transistor is electrically connected to the power management integrated circuit, and the gate of the first field effect transistor is electrically connected to the first end of the capacitor; the drain of the second field effect transistor is electrically connected to the positive electrode of the battery, the source of the second field effect transistor is electrically connected to the power management integrated circuit, and the gate of the second field effect transistor is electrically connected to the first end of the capacitor element; the second end of the capacitor element is electrically connected to the charging port of the charging circuit; one end of the first resistor element is electrically connected to the gate of the first field effect transistor, the gate of the second field effect transistor, and the first end of the capacitor element respectively, and the other end of the first resistor element and the negative electrode of the battery are both grounded; or, The reset circuit further includes a second resistor element; the first on-off module includes a path switching switch; the second on-off module includes a third field-effect transistor; wherein, a first end of the path switching switch is electrically connected to the charging port, a second end of the path switching switch is electrically connected to the power management integrated circuit, a third end of the path switching switch is electrically connected to a gate of the third field-effect transistor, and the path switching switch is controlled to connect a path between the first end and the second end or connect a path between the first end and the third end; a drain of the third field-effect transistor is electrically connected to a positive electrode of the battery, a source of the third field-effect transistor is electrically connected to the power management integrated circuit; one end of the second resistor element is electrically connected to both the gate of the third field-effect transistor and the third end of the path switching switch, and the other end of the second resistor element and the negative electrode of the battery are both grounded.

2. The stylus according to claim 1, wherein, when the first on-off module includes a path switching switch, the path switching switch is a button.

3. The stylus according to claim 1 or 2, wherein, the charging circuit includes: a charging feed point and a ground feed point, the charging port is the charging feed point, and the ground feed point is electrically connected to the negative electrode of the battery.

4. The stylus according to claim 1 or 2, wherein, the charging circuit includes: an electromagnetic induction coil and a rectifying circuit, an input end of the rectifying circuit is electrically connected to the electromagnetic induction coil, and an output end of the rectifying circuit is the charging port.

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