CN115549230A

CN115549230A - Charging control circuit and terminal

Info

Publication number: CN115549230A
Application number: CN202210088744.8A
Authority: CN
Inventors: 马柏杰; 张武甲
Original assignee: Honor Device Co Ltd
Current assignee: Honor Device Co Ltd
Priority date: 2022-01-25
Filing date: 2022-01-25
Publication date: 2022-12-30
Anticipated expiration: 2042-01-25
Also published as: CN115549230B

Abstract

A charge control circuit and a terminal. Under the condition of reducing the manufacturing cost of the wireless control circuit, the wireless charging circuit IC can be closed when the terminal does not charge other equipment ₂ And the battery leakage cannot be caused.

Description

Charging control circuit and terminal

Technical Field

The application relates to the technical field of circuits, in particular to a charging control circuit and a terminal.

Background

With the development of intelligent terminals, the tablet, the mobile phone and other terminals can be provided with a handwriting pen. Wherein, the flat panel can also be provided with other devices such as a keyboard and the like. At present, a terminal can charge other devices such as a stylus pen or a keyboard in a wireless charging mode.

In recent years, a technology of wirelessly charging other devices such as a stylus pen and a keyboard by a terminal is favored by users, and the terminal can realize a function of wirelessly charging other devices by a charging control circuit. How to achieve the purpose of wireless charging and reduce the cost of the charging control circuit is a direction worthy of research.

Disclosure of Invention

The application provides a charging control circuit and terminal, under the condition that wireless control circuit's cost of manufacture has been reduced for the terminal can close wireless charging circuit IC when not charging for other equipment ₂ Without causing battery leakageAnd (4) electricity.

In a first aspect, the present application provides a charging control circuit, including power supply and enabling control circuit, wireless charging circuit in the charging control circuit, including BOOST circuit in the power supply and enabling control circuit, wherein: the input end of the wireless charging circuit is connected with the output end of the BOOST circuit; the BOOST circuit is used for transmitting the electric energy in the battery to the input end of the wireless charging circuit; the enabling end of the wireless charging circuit is connected with the power supply and enabling control circuit; the power supply and enabling control circuit is used for inputting a first control voltage to an enabling end of the wireless charging circuit when the terminal is in a state of charging other equipment, wherein the first control voltage is less than or equal to the enabling voltage of the wireless charging circuit; the power supply and enabling control circuit is also used for inputting a second control voltage to the enabling end of the wireless charging circuit when the terminal is not in a state of charging other equipment, and the second control voltage is greater than the enabling voltage of the wireless charging circuit; under the condition that the enabling end of the wireless charging circuit receives the first control voltage and the second control voltage, the enabling end of the wireless charging circuit and the power supply and enabling control circuit are in a conducting state.

In the above embodiment, the wireless charging circuit is enabled by a low voltage, and when the control voltage received by the wireless charging circuit is the first control voltage, the control voltage indicates that the wireless charging circuit is a low voltage, so that the wireless charging circuit can enter an operating state, and thus the terminal can wirelessly charge other devices. When the control voltage received by the wireless charging circuit is the second control voltage, the wireless charging circuit is indicated to be high voltage, so that the wireless charging circuit can be turned off, the terminal can not wirelessly charge other equipment, the electric energy transmitted by the battery can not be received, and electric leakage can not be caused.

With reference to the first aspect, in an implementation manner, the charging control circuit further includes a first resistor, and an input end of the wireless charging circuit is connected to an output end of the BOOST circuit, specifically including: the input end of the wireless charging circuit is connected with the output end of the BOOST circuit through the first resistor.

In the above-mentioned implementationIn one example, the first resistor may be R in the exemplary charge control circuit provided in fig. 4 of the embodiments ₃ The first resistor is used to replace the MOS transistor M in the original scheme ₁₁ The cost of the first resistor is less than that of the MOS transistor M ₁₁ The cost of the MOS transistor can save one MOS transistor while achieving the same beneficial effect.

With reference to the first aspect, in an implementation manner, the power supply and enable control circuit further includes a second resistor, a third resistor, a fourth resistor, and a MOS transistor, where: the grid electrode of the MOS tube and the enabling end of the BOOST circuit are connected with a voltage input end; the second source electrode of the MOS tube is grounded; the drain electrode of the MOS tube is connected with the first end of the second resistor; the second end of the second resistor is connected with the first end of the third resistor and the first end of the fourth resistor; the first end of the third resistor is connected with the first end of the fourth resistor; the second end of the third resistor is connected with the output end of the BOOST circuit; the second end of the fourth resistor is connected with the enabling end of the wireless charging circuit.

In the above embodiments, the second resistor may be R in the exemplary charge control circuit provided in fig. 4 in the embodiments ₂ The third resistor may be R in the exemplary charge control circuit provided in fig. 4 in the embodiment ₁ The fourth resistor may be R in the exemplary charge control circuit provided in fig. 4 in the embodiment ₄ . When the enabling voltage of the wireless charging circuit is less than or equal to 0.3V, the resistor R ₁ Is divided by the resistance R ₂ When the resistance value of (3) is in the range of 20 to 45, the resistor R can be used when the MOS tube is conducted ₁ And a resistance R ₂ The voltage of the point A is less than or equal to that of the wireless charging circuit IC through serial voltage division ₂ The enable voltage of (2) is sufficient. The resistor R can be used when the MOS tube is not conducted ₁ And a resistance R ₂ The voltage of the point A is larger than that of the wireless charging circuit IC through serial partial pressure ₂ The enable voltage of (2) is sufficient.

With reference to the first aspect, in one embodiment, the wireless charging circuit is connected with a wireless charging coil; when the terminal is in a state of charging other equipment through the wireless charging coil, the enable end of the BOOST circuit receives a third control voltage provided by the voltage input end, and the third control voltage is greater than or equal to the enable voltage of the BOOST circuit; the terminal is not in a state of charging other devices through the wireless charging coil, the enabling end of the BOOST circuit receives a fourth control voltage provided by the voltage input end, and the fourth control voltage is smaller than the enabling voltage of the BOOST circuit.

In the above embodiment, the terminal may transmit the electric energy in the battery to other devices through the wireless charging coil to wirelessly charge the other devices, and when the terminal detects that the other devices are wirelessly charged through the terminal, the terminal may provide a third control voltage to the voltage input terminal, where the third control voltage is a high voltage, and then the voltage input terminal transmits the third control voltage to the enable terminal of the BOOST circuit, so that the BOOST circuit may be in an operating state, and the wireless charging circuit is also in an operating state, so that the terminal may charge the other devices. When the terminal does not detect that other equipment is wirelessly charged through the terminal, a fourth control voltage can be provided for the voltage input end, the fourth control voltage is low voltage, then, the voltage input end transmits the fourth control voltage to the enabling end of the BOOST circuit, the BOOST circuit can be in a non-working state, the wireless charging circuit is closed, the terminal can be charged for other equipment, and electric leakage can not be caused.

With reference to the first aspect, in an embodiment, the turn-on voltage of the MOS transistor is the same as the voltage value of the enable voltage of the BOOST circuit; under the condition that the voltage received by the grid electrode of the MOS tube is greater than or equal to the enabling voltage of the BOOST circuit, the MOS tube is conducted; and under the condition that the voltage received by the grid electrode of the MOS tube is less than the enabling voltage of the BOOST circuit, the MOS tube is not conducted.

With reference to the first aspect, in an implementation manner, the charge control circuit further includes N resistors, and a set of the N resistors is connected in series with the third resistor to divide voltage, where N is a positive integer greater than or equal to 1.

In the above embodiments, the example where N is 1 is describedObviously, referring to fig. 7 in the embodiment, the charge control circuit may further include a resistor R ₅ The resistance R ₅ Is arranged between point C and point A, and a resistor R ₁ The voltage division is performed in series to adjust the voltage at the point A.

With reference to the first aspect, in one embodiment, the first resistor has a resistance equal to 0 ohm or close to 0 ohm; the first resistor has a resistance of 50m omega-100 m omega in the case where the resistance is close to 0 ohm.

In the above embodiment, the first resistor is used to connect the input terminal Vin of the wireless charging circuit and the output terminal Vout of the BOOST circuit, and meanwhile, when the resistance value of the first resistor is 50m Ω -100m Ω, the power loss will not be too large due to too large resistance value. The smaller the resistance of the first resistor is, the smaller the loss of electric energy is. For example, near 0, there is little loss.

With reference to the first aspect, in one embodiment, the fourth resistor has a resistance equal to or close to 0 ohm; in the case where the first resistor has a resistance value close to 0 ohm, the resistance value is 50m omega-10 omega.

In the above embodiment, the control circuit is used for connecting the enable terminal Vin of the wireless charging circuit with the power supply and enable control circuit. The fourth resistor may be replaced by other components, such as a wire for a jumper like a resistor, which functions the same as the fourth resistor.

In a second aspect, the present application provides a terminal comprising a processor and a charge control circuit, wherein: the processor is used for inputting a control voltage to the charging control circuit; the control voltage may be the third control voltage or the fourth control voltage as described in any of the previous aspects; the charge control circuit is the charge control circuit as described in any of the preceding aspects.

In the above embodiment, the processor may be connected to a voltage input terminal (e.g., GPIO in fig. 4) of the charge control circuit to provide a control voltage thereto.

With reference to the second aspect, in one embodiment, when the processor inputs the third control voltage to the charging control circuit, the terminal may wirelessly charge other devices; when the processor inputs the fourth control voltage to the charging control circuit, the terminal cannot wirelessly charge other devices.

In the above embodiment, when the terminal detects that another device is wirelessly charged through the terminal, a third control voltage may be provided to the voltage input terminal, where the third control voltage is a high voltage, so that the terminal may wirelessly charge the other device. When the terminal does not detect that other devices are wirelessly charged through the terminal, a fourth control voltage can be provided to the voltage input end, the fourth control voltage is low voltage, and the terminal cannot wirelessly charge other devices.

Drawings

FIG. 1 is an exemplary scenario in which a terminal wirelessly charges a stylus;

FIG. 2 is a schematic diagram of the principles involved in the wireless charging process;

FIG. 3 is a schematic diagram of a charge control circuit involved in an arrangement;

FIG. 4 is a schematic diagram of a charge control circuit according to an embodiment of the present application;

FIG. 5 is a voltage analysis diagram related to an embodiment of the present application;

FIG. 6 is another voltage analysis diagram referred to in the examples of the present application;

fig. 7 is another schematic diagram of a charge control circuit according to an embodiment of the present application;

fig. 8 is a schematic structural diagram of a terminal according to an embodiment of the present application.

Detailed Description

The terminology used in the following embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. As used in the specification of the present application and the appended claims, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the listed items.

In the following, the terms "first", "second" are used for descriptive purposes only and are not to be construed as implying or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature, and in the description of embodiments of the application, unless stated otherwise, "plurality" means two or more.

The embodiment of the application provides a charging control circuit and a terminal, which can be applied to the process that the terminal wirelessly charges other equipment. The terminal is a device for supplying power, and may also be referred to as a transmitting end device (i.e., TX device). For example, the terminal may be a tablet, a mobile phone, or the like. The other devices are devices that receive electrical energy and may also be referred to as receiving end devices (i.e., RX devices). For example, the other device may be a stylus or a keyboard or the like.

In the embodiment of the present application, the description will be given by taking other devices as a stylus pen as an example. It should be understood that no limitation with respect to the embodiments of the disclosure is intended thereby.

Fig. 1 is an exemplary scenario in which a terminal wirelessly charges a stylus.

Fig. 2 is a schematic diagram of the principle involved in the wireless charging process.

For ease of understanding, the principle of charging other devices by the terminal will be described with reference to fig. 1 and 2.

As shown in fig. 1, a wireless charging coil 201 is provided in the stylus pen 200. The top 101 of the terminal 100 is provided with a wireless charging coil (not shown in the drawing). The user may attach stylus 200 to top 101 of terminal 100. Furthermore, the wireless charging coil of terminal 100 can perform energy interaction with the wireless charging coil of stylus pen 200, so as to transmit the electric energy of terminal 100 to stylus pen 200, i.e. to charge stylus pen 200. During the process of charging the stylus pen by the terminal 100, a charging icon 102 may be displayed in a user interface in the terminal 100. The charge icon 102 may be used to prompt the user to: the terminal 100 is currently charging the stylus pen 200.

As shown in fig. 2, the terminal 100 may include a battery 110, a charge control circuit 111, and a wireless charging coil 112. Stylus 200 may include a battery 210, a charge control circuit 211, and a wireless charging coil 212.

In some possible cases, the aforementioned related wireless charging coil may also be referred to as a charging coil. Wireless charging coil 112 may also be referred to as a transmitting coil, and wireless charging coil 212 may also be referred to as a receiving coil, among others.

When the terminal 100 wirelessly charges the stylus pen 200, the charging control circuit 111 of the terminal 100 may obtain a corresponding direct current signal from the battery 110. Further, the charge control circuit 111 may convert the direct current signal into an alternating electrical signal and then input the alternating electrical signal to the wireless charging coil 112. The wireless charging coil 112 may generate an alternating electromagnetic field in response to the alternating electrical signal.

Accordingly, stylus pen 200 may induce an alternating electromagnetic field emitted by wireless charging coil 112 through wireless charging coil 212, thereby generating an alternating electrical signal, and input the alternating electrical signal to charge control circuit 211. The charging control circuit 211 may rectify the alternating current signal into a direct current signal, and input the direct current signal to the battery 210 to charge the battery 210, thereby implementing wireless charging.

In the embodiments of the present application, the dc electrical signal and the alternating electrical signal are collectively referred to as an electrical signal, and may also be referred to as an electric current, an electric energy, or the like.

The battery in the following embodiments is represented as a terminal battery without specific description, the charge control circuit is represented as a terminal charge control circuit without specific description, and the wireless charging coil is represented as a terminal wireless charging coil without specific description.

As can be seen from the foregoing, in order to implement wireless charging for the handwriting pen, the terminal needs to transmit an electrical signal in the battery to the wireless charging coil through the charging control circuit.

Fig. 3 is a schematic diagram of a charge control circuit involved in an arrangement.

In one possible implementation, as shown in fig. 3, the charge control circuit may include a BOOST circuit IC ₁ Wireless charging circuit IC ₂ Resistance R ₁₁ Resistance R ₁₂ Resistance R ₁₃ MOS transistor M ₁₁ And MOS transistor M ₁₂ . BOOST circuit IC ₁ Is at the output end V _out Through walking line and wireless charging circuit IC ₂ Input terminal V of _in And (4) connecting. Wireless charging circuit IC ₂ Is enabled at a low level, i.e. when the wireless charging circuit IC is in operation ₂ Is received by the enable terminal nEN ₁₁ ) When the voltage is low, the wireless charging circuit IC can be enabled ₂ And is in a working state. BOOST circuit IC ₁ When not in operation, its output terminal V _out Is approximately equal to the system voltage (3.5V-4.4V). Wireless charging circuit IC ₂ Input terminal V of _in The Under Voltage Lock Out (UVLO) voltage of (1) is less than the system voltage, and may be between 2.75V and 2.95V.

It should be understood here that the wireless charging circuit IC ₂ The control voltage of the enable terminal nEN is defaulted to be low voltage, namely the wireless charging circuit IC ₂ The low enable state is always satisfied. The realization mode is as follows: resistance R ₁₃ One terminal of and wireless charging circuit IC ₂ Is connected to the enable terminal nEN, the resistor R ₁₃ Is connected to a first chip in a System On Chip (SOC) of the terminal, which may be a wireless charging circuit IC ₂ The enable terminal nEN of (a) provides a low voltage so that it can be in an active state. The first chip may be a Central Processing Unit (CPU) of the terminal.

MOS transistor M is not included in the circuit ₁₁ Due to BOOST circuit IC ₁ Output terminal V of _out Voltage of the wireless charging circuit IC is always greater than that of the wireless charging circuit IC ₂ Input terminal V of _in The under-voltage locking voltage, and a wireless charging circuit IC ₂ The control voltage of the enable terminal nEN is low voltage, so that the wireless charging circuit IC can be enabled ₂ And is in a standby state. Without charging other devices at the terminalIn the case of when the wireless charging circuit IC ₂ In the standby state, the battery can still pass through the BOOST circuit IC ₁ To wireless charging circuit IC ₂ The electrical signal is transmitted, resulting in electrical leakage. In this scheme, to solve the leakage problem, a MOS transistor M is added ₁₁ So that the MOS transistor M is closed under the condition that the terminal does not charge other equipment ₁₁ . The specific implementation mode is as follows: MOS transistor M ₁₁ Source (which may correspond to point S in fig. 3) of (a) and BOOST circuit IC ₁ Is at the output end V _out Connected, MOS transistor M ₁₁ And the drain (which may correspond to point D in fig. 3) of the wireless charging circuit IC ₂ Input terminal V of _in Connected, MOS transistor M ₁₁ Gate (which may correspond to point G in fig. 3) and resistor R ₁₂ And a resistance R ₁₂ Is connected at one end. Can pass through the resistor R ₁₁ And a resistance R ₁₂ Control MOS tube M ₁₁ So that the MOS transistor M is driven by the voltage of the gate ₁₁ The gate-source voltage of the MOS transistor M does not meet the conduction condition of the MOS transistor M, so that the MOS transistor M is connected with the gate-source voltage of the MOS transistor M ₁₁ And is not conductive. Wherein, the gate-source voltage is the difference between the voltage of the gate and the voltage of the source. Generally, in this scheme, the resistance R ₁₂ And a resistance R ₁₂ The resistance value of (c) may be 10 kilo ohms (K Ω) to satisfy the above description.

Thus, the BOOST circuit IC can be disconnected ₁ Output terminal V of _out And wireless charging circuit IC ₂ Input terminal V of _in Connected, the battery can not pass through the BOOST circuit IC ₁ To wireless charging circuit IC ₂ Transmit electric signal to make wireless charging circuit IC ₂ May be turned off.

In the embodiment of the present application, other components are used in the charge control circuit instead of the MOS transistor M described above ₁₁ . Under the condition of reducing the manufacturing cost of the wireless control circuit, the terminal can close the wireless charging circuit IC when not charging other equipment ₂ And the battery leakage cannot be caused.

Fig. 4 is a schematic diagram of a charge control circuit according to an embodiment of the present application.

As shown in fig. 4, the charge control circuit may includeTo include a BOOST circuit IC ₁ Wireless charging circuit IC ₂ Resistance R ₁ Resistance R ₂ Resistance R ₃ And a resistor R ₄ And a MOS transistor M. Wherein, the resistance R ₃ For connecting BOOST circuits IC ₁ Is at the output end V _out And wireless charging circuit IC ₂ Input terminal V of _in . Resistance R ₄ And a wireless charging circuit IC ₂ Is connected to the enable terminal nEN, resistor R ₄ And the other end (may also be referred to as the second end) of (c) and a resistor R ₁ And a resistance R ₂ Is connected at one end. Resistance R ₁ And the other end of (1) and a BOOST circuit IC ₁ Output terminal V of _out And (4) connecting. Resistance R ₂ And the other end of the transistor M is connected to the drain of the MOS transistor M (which may correspond to point D in fig. 4). The source (which may correspond to point S in fig. 4) of the MOS transistor M is grounded, and the gate (which may correspond to point G in fig. 4) of the MOS transistor M is used for inputting the control voltage V ₁ . Grid electrode of MOS (Metal oxide semiconductor) transistor M and BOOST circuit IC ₁ Is connected to a voltage input terminal (corresponding to GPIO in fig. 4), which may be provided by a second chip in the SOC of the terminal, which may supply the gate of the MOS transistor M and the BOOST circuit IC through the voltage input terminal GPIO ₁ Is input with a control voltage V ₁ . The second chip may be the same as or different from the first chip described above. For example, the second chip may be a CPU.

Wherein, the BOOST circuit IC ₁ For high voltage enabling, i.e. the control voltage V received by the enable terminal EN of the BOOST circuit IC1 ₁ When the voltage is high, the wireless charging circuit IC can be enabled ₂ Is in a working state. Wireless charging circuit IC ₂ For low-voltage enabling, i.e. wireless charging circuits IC ₂ When the control voltage of the enable terminal nEN is low voltage, the wireless charging circuit IC can be enabled ₂ And is in a working state.

It should be understood that the wireless charging circuit IC ₂ When the control voltage received by the enable terminal nEN of (1) is less than or equal to the first threshold voltage, the control voltage is a low voltage. Wireless charging circuit IC ₂ Enable terminal nEN of receiveIs greater than or equal to the second threshold voltage, then the control voltage is a high voltage (not a low voltage). Wherein the first threshold voltage is less than the wireless charging circuit IC ₂ The second voltage threshold is greater than or equal to the wireless charging circuit IC ₂ The enable voltage of (2). BOOST circuit IC ₁ Is greater than or equal to the third threshold voltage, the control voltage is a high voltage. BOOST circuit IC ₁ Is less than or equal to a fourth voltage threshold, the control voltage is a low voltage (not a high voltage), wherein the third threshold voltage is greater than or equal to the BOOST circuit IC ₁ The fourth voltage threshold is less than the BOOST circuit IC ₁ Is detected. In one possible case, the wireless charging circuit IC ₂ The enable voltage of (1.8V) BOOST circuit IC ₁ Can be 0.3V, less than BOOST circuit IC ₁ Is at the output end V _out The voltage of (c).

The charge control circuit provided in fig. 4 differs from the charge control circuit referred to in the previous solution in two ways:

(1) Compared with the charging control circuit shown in fig. 3, the charging control circuit according to the embodiment of the present application does not include the MOS transistor M ₁₁ But through a resistor R ₄ Connecting BOOST circuits IC ₁ Is at the output end V _out And a wireless charging circuit IC ₂ Input terminal V of _in . Thus, the battery can pass through the BOOST circuit IC ₁ To wireless charging circuit IC ₂ An electrical signal is input.

(2) In contrast to the charging control circuit shown in fig. 3, the charging control circuit referred to in the embodiment of the present application does not provide the wireless charging circuit IC with the first chip (e.g., processor) ₂ The enable terminal nEN of (a) inputs a default low voltage as a control voltage (e.g., V in fig. 3 as described above) ₁₁ ) To control the wireless charging circuit IC ₂ The operating state of (c). In the embodiment of the application, the wireless charging circuit IC ₂ The enable terminal nEN is connected with the power supply and enable control circuit and is used for receiving the control of the output of the power supply and enable control circuitVoltage V _B . Thus, the wireless charging circuit IC can be adjusted by the power supply and enabling control circuit ₂ Enable terminal nEN of the wireless charging circuit IC, so that the wireless charging circuit IC ₂ May be in an active state or in an inactive state.

It should be understood that the resistance R ₁ Cost ratio of MOS transistor M ₁₁ Is lower in cost, and it can be seen from fig. 3 and 4 that the resistor R is used ₁ Replace MOS tube M ₁₁ Can practice thrift the cost of manufacture of the control circuit that charges, make the terminal wirelessly charge for other equipment simultaneously, but when the terminal does not charge for other equipment, can close wireless charging circuit IC ₂ And the battery leakage cannot be caused.

Wherein, the power supply and enable control circuit comprises a resistor R ₄ And a resistor R ₁ Resistance R ₂ And a MOS transistor M. Wherein, the resistance R ₄ Resistance R ₁ Resistance R ₂ And the connection relationship of the MOS transistor M can refer to the foregoing description of the charging control circuit, and will not be described herein again. The power supply and enable control circuit is used for adjusting the wireless charging circuit IC ₂ The enable terminal nEN. Wherein, the wireless charging circuit IC ₂ The control voltage of the enable terminal nEN of (1) corresponds to the voltage at point B in the figure.

The resistor R ₄ One terminal of and wireless charging circuit IC ₂ Is connected to the enable terminal nEN, the resistor R ₄ The other end of which corresponds to point a. Note that the voltage at point A is V _A Note that the voltage at point B is V _B Here, it is understood that V _A ＝V _B . Voltage V at point A is discussed subsequently _A Instead of discussing the voltage V at point B _B . When the voltage at the point A is low and the voltage at the point B is also low, the wireless charging circuit IC ₂ Is received by the enable terminal nEN _B ) At a low voltage, the wireless charging circuit IC ₂ May be in an active state or a standby state. When the voltage at the point A is high and the voltage at the point B is also high, the wireless charging circuit IC ₂ Is received by the enable terminal nEN _B ) At high voltage, at this time, noneLine charging circuit IC ₂ May be in an off state.

The wireless charging circuit IC mentioned above ₂ The terminal can be in a working state, namely, the terminal can wirelessly charge the handwriting pen, and the conditions required to be met comprise the following two conditions:

condition 1: wireless charging circuit IC ₂ Input terminal Vin and BOOST circuit IC ₁ The output terminal Vout is conductive and can receive power from the battery (i.e., can receive power from the battery). And wireless charging circuit IC ₂ The voltage of the input terminal Vin is greater than or equal to a first working voltage, and the value of the first working voltage is greater than that of the BOOST circuit IC ₁ When in the closed state, the BOOST circuit IC ₁ Voltage of the output terminal Vout.

Condition 2: wireless charging circuit IC ₂ The enable terminal nEN receives a low control voltage.

The wireless charging circuit IC mentioned above ₂ The terminal can be in an off state, that is, the terminal can wirelessly charge the stylus pen, and the condition to be met may be at least one of the following conditions 3 or 4:

condition 3: the aforementioned condition 2 is not satisfied, that is, the wireless charging circuit IC ₂ The enable terminal nEN receives a high voltage.

Condition 4: wireless charging circuit IC ₂ Input terminal Vin and BOOST circuit IC ₁ Are not conductive.

The wireless charging circuit IC mentioned above ₂ The terminal can be in a standby state, which means that the terminal cannot wirelessly charge the handwriting pen, but consumes the electric quantity in the battery, and the standby state is a state to be avoided by the embodiment of the application. Wireless charging circuit IC ₂ The description of the standby state may refer to the description of fig. 3, and will not be repeated here.

In the embodiment of the application, the terminal is not required to be in the state of charging the handwriting pen, so that the wireless charging circuit IC is enabled to be in the state of charging the handwriting pen ₂ Can be in a closed state, thus enabling the wireless charging circuit IC ₂ Cannot receive the electric signal in the battery and cannot causeThe battery leaks electricity.

It should be understood that, in the charge control circuit shown in fig. 4, the aforementioned condition 4 may not be satisfied at all times regardless of whether the terminal is in a state of charging the stylus pen, because: wireless charging circuit IC ₂ Is at the output end V _out Is approximately equal to the system voltage (3.5V-4.4V), but the wireless charging circuit IC ₂ Input terminal V of _in The under-voltage lockout voltage (which may be between 2.75V-2.95V) is less than the system voltage. BOOST circuit IC ₁ Output terminal V of _out And a wireless charging circuit IC ₂ Input terminal V of _in Through a resistance R ₃ And (4) connecting. This represents the BOOST circuit IC ₁ Is at the output end V _out And wireless charging circuit IC ₂ Input terminal V of _in There is a voltage difference between them and is a path. In such a case, when the terminal is not in a state of charging the stylus pen, the wireless charging circuit IC can be caused to be in a state of charging the stylus pen by causing condition 3 to be established ₂ Can be turned off without causing current leakage.

It should be understood that the situation in which the terminal is in a state of charging the stylus includes, but is not limited to, the following scenarios:

scene 1: as shown in fig. 1, the handwriting pen is attached to the terminal, which indicates that the terminal is in a state of charging the handwriting pen. One possible way is for the terminal to charge the stylus through a wireless charging coil.

Scene 2: the terminal can be provided with a containing device, the containing device can be used for containing the handwriting pen, and when a user places the handwriting pen in the containing device, the terminal is in a state of charging the handwriting pen. One possible way is for the terminal to charge the stylus through a wireless charging coil.

It should be understood that in the charge control circuit as shown in fig. 4, the state that the terminal is in the state of charging the stylus pen may be a state that the terminal charges the stylus pen through a wireless charging coil.

The following describes, in conjunction with the charging control circuit shown in fig. 4, that the terminal can turn off the wireless charging circuit IC when the terminal is not charging other devices ₂ Will notThe principle of causing the battery leakage and the operation principle of the terminal when the stylus pen is charged by the charging control circuit are described.

When the terminal does not charge other equipment, the wireless charging circuit IC can be closed ₂ The principle of not causing the leakage of electricity from the battery can be described as follows.

When the terminal is not in the state of charging the stylus pen, the wireless charging circuit IC can be turned off only by making the aforementioned condition 3 (i.e. the condition 2 is not satisfied) ₂ . Wherein the condition 3 is to immediately make the wireless charging circuit IC ₂ The enable terminal nEN receives a control voltage that is not a low voltage (is a high voltage).

In the control circuit referred to in fig. 4, a wireless charging circuit IC is caused to be provided ₂ The principle that the control voltage received by the enable terminal nEN is not a low voltage can be referred to as follows.

In one possible implementation, the MOS transistor M may be an NMOS transistor. The conduction condition of the NMOS tube is as follows: the MOS tube M is conducted when the grid-source voltage is larger than or equal to the conducting voltage. Wherein, the gate-source voltage is the difference between the voltage of the gate and the voltage of the source. The condition that the MOS transistor M is turned on can be expressed as:

V _gs (M)>V _th (M) formula (1)

Wherein, in the formula (1), V _gs And (M) represents the grid source voltage of the MOS tube M. Wherein, V _gs (M)＝V _g (M)-V _s (M)，V _g (M) represents the gate voltage, V, of the MOS transistor M _s And (M) represents the source voltage of the MOS transistor M. V _th (M) represents the conduction voltage of the MOS transistor M. The voltage value of the turn-on voltage can be set to be equal to the BOOST circuit IC ₁ The voltage values of the enable voltages of (1) are the same.

In the case that the terminal does not charge other devices, the SOC of the terminal may input a low voltage (which may also be referred to as a first voltage) to the voltage input terminal GPIO connected to the gate of the MOS transistor M, so that the gate voltage of the MOS transistor M is the first voltage. The first voltage is less than or equal to BOOST circuit IC ₁ Due to the BOOST circuit IC ₁ Is equal to MOS transistor MOn voltage of V _g (M)<V _th (M). At this time, since the source of the MOS transistor M is grounded, the source voltage of the MOS transistor M is 0V, and V is _s (M) =0V. Therefore, the gate-source voltage of the MOS transistor M is smaller than the turn-on voltage, i.e. V _gs (M)<V _th (M), the MOS transistor M is not conducted. The voltage V at point A at this time _A Equal to BOOST circuit IC ₁ Is at the output end V _out Of the voltage of (c). In combination with the above, the wireless charging circuit IC ₂ Is received by the enable terminal nEN (i.e. the voltage V at point B) _B ) Voltage V equal to point A _A Then wireless charging circuit IC ₂ Is equal to the BOOST circuit IC ₁ Is at the output end V _out The voltage of (c). Thus, the wireless charging circuit IC ₂ Is greater than or equal to the second threshold voltage (i.e., the control voltage is a high voltage, condition 2 does not hold), so that the wireless charging circuit IC receives the control voltage at the enable terminal nEN, which is greater than or equal to the second threshold voltage ₂ Can be in a closed state and cannot cause electric leakage.

In a possible implementation manner, the manner in which the SOC of the terminal may input the first voltage to the voltage input terminal GPIO connected to the gate of the MOS transistor M includes: the gate of the MOS transistor M is connected to a voltage input GPIO, which may be provided by a second chip in the SOC of the terminal. When the terminal is not in a wireless charging state for the stylus pen, the second chip may input a first voltage to the gate of the MOS transistor M through the voltage input terminal GPIO.

Wherein, the voltage V of point B _B Equal to BOOST circuit IC ₁ Is at the output end V _out The analysis process of the voltage of (2) can refer to the following description.

BOOST Circuit IC, as illustrated in FIG. 5 ₁ Is at the output end V _out The grounding point to which the drain of the MOS transistor M is connected corresponds to a point D in fig. 5 corresponding to a point C in fig. 5, and points a and B in the charge control circuit shown in fig. 4 correspond to points a and B in fig. 5, respectively.

Under the condition that the MOS tube M is not conducted, a circuit from a point C to a point D through a point A is in an open circuit state, a circuit from the point C to a point B through the point A is in a conducting state, and the voltage of the point A is controlled by the voltage of the point CThe point is determined by the circuit from point a to point B. The resistor R is connected with the point C and the point B through a resistor R, and the voltage difference is not generated between the point C and the point B ₁ And a resistor R ₄ Will not divide the pressure, then V _B And V _A Equal to voltage V at point C _C Equal, V _C For BOOST circuit IC ₁ Is at the output end V _out May be referred to as Vout'.

For the working principle that the terminal charges the stylus pen through the charging control circuit, the following description may be referred to.

When the terminal is in a state of charging the stylus pen, the stylus pen may be charged only when the aforementioned condition 1 and condition 2 are both satisfied.

Here, the description of making the condition 1 be satisfied can refer to the following description.

When BOOST circuit IC ₁ When the circuit is in the working state, the condition 1 is satisfied, wherein, the BOOST circuit IC ₁ The working state refers to a BOOST circuit IC ₁ Can reach a high voltage (also referred to as a second voltage), so that the BOOST circuit IC ₁ The voltage of the output terminal Vout can be raised from the system voltage (3.5V-4.4V) to a second working voltage, which is greater than the wireless charging circuit IC ₂ When the resistance of the resistor R3 is 0 Ω or close to 0 Ω, for example, 50m Ω -100m Ω, the first operating voltage at the input terminal Vin can make the wireless charging circuit IC have a high voltage ₂ The voltage of the input terminal Vin is approximately equal to the second operating voltage (greater than the first operating voltage), so that the condition 1 is satisfied. Wherein, the resistance R ₃ The resistance value of the wireless charging circuit is 0 omega or close to 0 omega, the wireless charging circuit is used for connecting the input end Vin of the wireless charging circuit with the output end Vout of the BOOST circuit, meanwhile, the phenomenon that the loss of an electric signal is overlarge due to too large resistance value is avoided, and therefore the terminal can be in a wireless charging state for the handwriting pen, and the wireless charging circuit IC is used for charging the handwriting pen ₂ Is closer to the BOOST circuit IC ₁ So that the wireless charging circuit IC can be reached ₂ To the input terminal Vin, so that the wireless charging circuit IC is charged ₂ Entering into working state, and transmitting the received electric signal of the batteryTo the wireless charging coil.

Wherein the condition 2 is to immediately make the wireless charging circuit IC ₂ The enable terminal nEN receives a low control voltage. The description for making the condition 2 be established can refer to the following description.

In the charge control circuit referred to in fig. 4, a wireless charging circuit IC is caused to be provided ₂ The principle that the control voltage received by the enable terminal nEN is a low voltage can be referred to as follows.

The MOS transistor M in the charge control circuit shown in fig. 4 is an NMOS transistor as described above. The description of the NMOS transistor is the same as that described above, and reference may be made to the foregoing description, which is not repeated herein.

In a possible implementation manner, a hall sensor may be disposed in the terminal, and in response to the operation of attaching the stylus pen to the terminal, the hall sensor may input a high voltage (which may also be referred to as a second voltage) to the voltage input terminal GPIO connected to the gate of the MOS transistor M through the SOC, so that the gate voltage of the MOS transistor M is the second voltage. The second voltage is greater than or equal to BOOST circuit IC ₁ Due to the BOOST circuit IC ₁ Is equal to the turn-on voltage of MOS transistor M, then V _g (M)>V _th (M). At this time, since the source of the MOS transistor M is grounded, the source voltage of the MOS transistor M is 0V, and V is _s (M) =0V. Therefore, the gate-source voltage of the MOS transistor M is larger than the turn-on voltage, i.e. V _gs (M)>V _th (M), the MOS transistor M is conducted. The voltage V at point A at this time _A Can be less than or equal to the wireless charging circuit IC ₂ The enable terminal nEN. In combination with the above, the wireless charging circuit IC ₂ Is received by the enable terminal nEN (i.e. the voltage V at point B) _B ) Voltage V equal to point A _A Then wireless charging circuit IC ₂ The enable terminal nEN receives a control voltage less than or equal to the wireless charging circuit IC ₂ Is detected. Thus, the wireless charging circuit IC ₂ Is less than or equal to the first threshold voltage (i.e. the control voltage is a low voltage, and the condition 2 holds), so that the wireless charging circuit IC receives the control voltage at the enable terminal nEN, and the wireless charging circuit IC is enabled to operate in a charging mode ₂ Can be in working stateThen, both the condition 1 and the condition 2 are satisfied, and the terminal can charge the stylus pen.

In a possible implementation manner, the manner in which the SOC of the terminal may input the second voltage to the voltage input terminal GPIO connected to the gate of the MOS transistor M includes: the gate of the MOS transistor M is connected to a voltage input GPIO, which may be provided by a second chip in the SOC of the terminal. When the terminal is in a wireless charging state for the stylus pen, the second chip can input a second voltage to the gate of the MOS transistor M through the voltage input terminal GPIO.

Wherein, the voltage V of point B _B Less than or equal to wireless charging circuit IC ₂ The analysis process of the enable voltage of (2) can refer to the following description.

BOOST Circuit IC, as illustrated in FIG. 6 ₁ Is at the output end V _out The grounding point to which the drain of the MOS transistor M is connected corresponds to a point D in fig. 6 corresponding to a point C in fig. 6, and points a and B in the charge control circuit shown in fig. 4 correspond to points a and B in fig. 6, respectively.

When the MOS tube M is conducted, the circuit from the point C to the point B through the point A is in a conducting state but has no voltage difference, but the circuit from the point C to the point D through the point A is in a conducting state and has a voltage difference, and the voltage magnitude of the point A is determined by the circuit from the point C to the point D through the point A. Voltage V at point C _C For BOOST circuit IC ₁ Is at the output end V _out Can be designated as Vout', i.e. V _C ＝V _out . Grounding point D, the voltage V of point D _D =0V. In the circuit from point C to point D through point A, there is a resistor R ₁ And a resistance R ₂ If the voltages are divided in series, the voltage at point a can be referred to the following equation (2).

In the above formula (2), vout' represents the BOOST circuit IC ₁ Is at the output end V _out Voltage of R' ₁ Represents the resistance R ₁ Of resistance value, R' ₂ Represents the resistance R ₂ Resistance value ofSize.

Referring to equation (2), it can be known that the resistor R can be configured ₁ Resistance value of (2) and resistance R ₂ The resistance value of the wireless charging circuit IC is used for adjusting the voltage of the point B to be less than or equal to that of the wireless charging circuit IC ₂ Enabling voltage of, for example, R' ₁ ＝150KΩ，R′ ₂ =4.7K Ω. Resistance R ₁ Resistance value of and resistance R ₂ The magnitude of resistance of (1) can also have other configuration values, for example, R' ₁ ＝160KΩ，R′ ₂ =5K Ω, and for example, when the enable voltage of the wireless charging circuit is less than or equal to 0.3V, the resistance R ₁ Is divided by the resistance R ₂ May range between 20 and 45. Can realize the resistance R ₁ And a resistance R ₂ The voltage of the point A is less than or equal to that of the wireless charging circuit IC through serial voltage division ₂ The enable voltage of (2) is sufficient. The embodiment of the application is to the resistance R ₁ Resistance value of and resistance R ₂ The resistance value of (3) is not limited as long as the resistor R can be switched on when the MOS transistor M is switched on ₁ And a resistance R ₂ The voltage of the point A is less than or equal to that of the wireless charging circuit IC through serial voltage division ₂ The enable voltage of (2) is sufficient.

In one possible implementation, the wireless charging circuit IC ₂ Can be set to 0.5V at R' ₁ ＝150KΩ，R′ ₂ In the case of =4.7K Ω, the voltage at the point a may be 0.15V, and since the voltage at the point B is equal to the voltage at the point a, the wireless charging circuit IC is caused to operate ₂ The received control voltage (0.15V) is less than the wireless charging circuit IC ₂ Is enabled (0.5V), then the wireless charging circuit IC ₂ And when the handwriting pen is in a working state, the handwriting pen can receive the electric signal transmitted by the battery to charge the handwriting pen.

It should be understood that the wireless charging circuit IC ₂ The enable voltage of (2) may be set to 0.5V for illustration, and should not be limited to the embodiment of the present application, and may be set to other values, for example, 0.4V, and the like, which are not limited to the embodiment of the present application.

It should be understood that the hall sensor mentioned above is only an example for detecting whether the terminal is in a state of charging the stylus pen, and in other cases, other components may be used instead of the hall sensor, such as a pressure sensor, which can detect the change of gravity when the stylus pen is attached to the terminal, so that the pressure sensor can input a second voltage to the voltage input terminal GPIO connected to the gate of the MOS transistor M through the SOC. Other components are also possible, and the embodiments of the present application are not limited thereto.

It should be understood that the charge control circuit shown in fig. 4 is merely an exemplary illustration, and that other examples are possible, and that one or more of the components may be replaced by other components that serve the same purpose. A plurality of components in the charge control circuit may also be combined. Other examples of the charge control circuit may refer to the following description:

other examples 1: the MOS transistor M in the charge control circuit shown in fig. 4 may be other components besides the NMOS transistor. For example, it can be a single-pole double-throw switch, which acts in concert with the MOS transistor M to control the resistance R ₂ And whether the D point is connected. Wherein, the control voltage received by the single-pole double-throw switch can be set to be greater than or equal to the BOOST circuit IC ₁ When the voltage is enabled, the resistor R is enabled ₂ Connected with the D point, the control voltage received by the single-pole double-throw switch is less than the BOOST circuit IC ₁ When the voltage is enabled, the resistor R is enabled ₂ Not connected to point D.

Other examples 2: the aforementioned FIG. 4 shows that between point C and point A, in addition to possibly including resistor R ₁ In addition, other N resistors can be included, and the N resistors can be connected with the resistor R ₁ The voltage division is performed in series to adjust the voltage at the point a. Wherein N is a positive integer greater than or equal to 1. Taking N as an example for explanation, referring to fig. 7, the charge control circuit may further include a resistor R ₅ The resistance R ₅ Is arranged between point C and point A, and a resistor R ₁ The voltage division is performed in series to adjust the voltage at the point A. In one possible implementation, if in the charge control circuit shown in fig. 4, the resistor R is ₁ Is M, is shown in FIG. 5In the output charge control circuit, then R ₁ Resistance value of plus R ₂ The resistance value of (b) is equal to M, the charging control circuit shown in fig. 5 can be made to have the same function as the charging control circuit shown in fig. 4.

Other examples 3: the aforementioned resistor R referred to in FIG. 4 ₃ May be other parts, e.g. conductors for making jumpers like resistors, acting in conjunction with the resistor R ₃ The wireless charging circuit is used for connecting the input end Vin of the wireless charging circuit with the output end Vout of the BOOST circuit, and meanwhile, the electric signal loss cannot be too large due to too large resistance. For another example, the input terminal Vin of the wireless charging circuit may be directly connected to the output terminal Vout of the BOOST circuit through a wire, and no other component is connected therebetween.

Other examples 4: the aforementioned resistor R referred to in FIG. 4 ₄ Has a resistance of 0 omega or close to 0 omega, for example 50m omega-10 omega, and may have a higher resistance than the resistor R ₃ And is larger. Resistance R ₄ The wireless charging circuit is used for connecting an enabling terminal Vin of the wireless charging circuit with a power supply and enabling control circuit. R ₄ Other parts may be substituted, e.g. conductors for making jumpers, like resistors, acting in conjunction with the resistor R ₄ The same is true.

In the embodiment of the application, the BOOST circuit IC ₁ It may also be called a BOOST circuit, and similarly, other nouns including english after chinese may be replaced by only the preceding chinese. For example, a wireless charging circuit IC ₂ May also be referred to as a wireless charging circuit, the voltage input terminal GPIO may also be referred to as a voltage input terminal, etc. Resistance R ₁ Also referred to as a third resistor, resistor R ₂ Also referred to as a second resistance, resistor R ₃ Which may also be referred to as a first resistance, resistor R ₄ Which may also be referred to as a fourth resistor. One end of any resistor may be referred to as a first end of the resistor, and an end other than the first end may be referred to as a second end. For example, the second resistance (R) ₂ ) May be referred to as a first terminal, and the other end of the second resistor may be referred to as a second terminal. The first threshold voltage may also be referred to as a first control voltage, the second threshold voltage may also be referred to as a second control voltage, and the third threshold voltageThe control voltage may also be referred to as a third control voltage and the fourth threshold voltage may also be referred to as a fourth control voltage.

The terminal may use the charging control circuit in the embodiment of the present application when charging the stylus pen, and may use the charging control circuit in the embodiment of the present application when charging other devices. For example, the other device may be a keyboard.

An exemplary terminal provided by the embodiments of the present application is described below.

The following describes embodiments in detail by taking a terminal as an example. It should be understood that a terminal may have more or fewer components than shown, may combine two or more components, or may have a different configuration of components. The various components shown in the figures may be implemented in hardware, software, or a combination of hardware and software, including one or more signal processing and/or application specific integrated circuits.

The terminal may include: the mobile phone includes a processor 110, an external memory interface 120, an internal memory 121, a Universal Serial Bus (USB) interface 130, a charging management module 140, a battery 142, an antenna 1, an antenna 2, a mobile communication module 150, a wireless communication module 160, an audio module 170, a speaker 170A, a receiver 170B, a microphone 170C, an earphone interface 170D, a sensor module 180, a button 190, a motor 191, an indicator 192, a camera 193, a display screen 194, a Subscriber Identity Module (SIM) card interface 195, and the like.

It is to be understood that the illustrated structure of the embodiments of the present application does not constitute a specific limitation to the terminal. In other embodiments of the present application, the terminal may include more or fewer components than shown, or some components may be combined, some components may be split, or a different arrangement of components may be used. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

Processor 110 may include one or more processing units, such as: the processor 110 may include an Application Processor (AP), a modem processor, a Graphics Processing Unit (GPU), an Image Signal Processor (ISP), a controller, a memory, a video codec, a Digital Signal Processor (DSP), a baseband processor, and/or a neural-Network Processing Unit (NPU), etc. Wherein, the different processing units may be independent devices or may be integrated in one or more processors.

Wherein, the controller can be the neural center and the command center of the terminal. The controller can generate an operation control signal according to the instruction operation code and the timing signal to complete the control of instruction fetching and instruction execution.

A memory may also be provided in processor 110 for storing instructions and data. In some embodiments, the memory in the processor 110 is a cache memory. The memory may hold instructions or data that have just been used or recycled by the processor 110. If the processor 110 needs to use the instruction or data again, it can be called directly from the memory. Avoiding repeated accesses reduces the latency of the processor 110, thereby increasing the efficiency of the system.

In some embodiments, processor 110 may include one or more interfaces. The interface may include an integrated circuit (I2C) interface, an integrated circuit built-in audio (I2S) interface, a Pulse Code Modulation (PCM) interface, a Subscriber Identity Module (SIM) interface, and/or a Universal Serial Bus (USB) interface, etc.

It should be understood that the interface connection relationship between the modules illustrated in the embodiments of the present application is only an exemplary illustration, and does not form a limitation on the structure of the terminal. In other embodiments of the present application, the terminal may also adopt different interface connection manners or a combination of multiple interface connection manners in the foregoing embodiments.

The charging management module 140 is configured to receive charging input from a charger. The charger can be a wireless charger or a wired charger.

The charging management module 140 includes a charging control circuit 140A, a wireless charging coil 140B, and the like.

The charging control circuit 140A may be connected to the battery 142 and the wireless charging coil 140B, and configured to wirelessly charge other devices.

The wireless communication function of the terminal can be realized by the antenna 1, the antenna 2, the mobile communication module 150, the wireless communication module 160, the modem processor, the baseband processor, and the like.

The antennas 1 and 2 are used for transmitting and receiving electromagnetic wave signals. Each antenna in a terminal may be used to cover a single or multiple communication bands. Different antennas can also be multiplexed to improve the utilization of the antennas.

The mobile communication module 150 may provide a solution including 2G/3G/4G/5G wireless communication and the like applied on the terminal. The mobile communication module 150 may include at least one filter, a switch, a power amplifier, a Low Noise Amplifier (LNA), and the like.

The modem processor may include a modulator and a demodulator. The modulator is used for modulating a low-frequency baseband signal to be transmitted into a medium-high frequency signal. The demodulator is used for demodulating the received electromagnetic wave signal into a low-frequency baseband signal.

The wireless communication module 160 may provide applications on the terminal, including a Wireless Local Area Network (WLAN) (e.g., a wireless fidelity (Wi-Fi) network), a Bluetooth (BT), and so on.

In some embodiments, the antenna 1 of the terminal is coupled with the mobile communication module 150 and the antenna 2 is coupled with the wireless communication module 160 so that the terminal can communicate with a network and other devices through a wireless communication technology. The wireless communication technology may include global system for mobile communications (GSM), general Packet Radio Service (GPRS), and the like.

The terminal implements the display function through the GPU, the display screen 194, and the application processor, etc. The GPU is a microprocessor for image processing, and is connected to the display screen 194 and an application processor. The GPU is used to perform mathematical and geometric calculations for graphics rendering. The processor 110 may include one or more GPUs that execute program instructions to generate or alter display information.

The display screen 194 is used to display images, video, and the like. The display screen 194 includes a display panel.

The terminal can implement a shooting function through the ISP, the camera 193, the video codec, the GPU, the display screen 194, the application processor, and the like.

The ISP is used to process the data fed back by the camera 193.

The camera 193 is used to capture still images or video. The object generates an optical image through the lens and projects the optical image to the photosensitive element. The photosensitive element may be a Charge Coupled Device (CCD) or a complementary metal-oxide-semiconductor (CMOS) phototransistor.

The digital signal processor is used for processing digital signals, and can process digital image signals and other digital signals. For example, when the terminal selects a frequency point, the digital signal processor is used for performing fourier transform and the like on the frequency point energy.

Video codecs are used to compress or decompress digital video. The terminal may support one or more video codecs. In this way, the terminal can play or record video in a plurality of coding formats, such as: moving Picture Experts Group (MPEG) 1, MPEG2, MPEG3, MPEG4, and the like.

The NPU is a neural-network (NN) computing processor, which processes input information quickly by referring to a biological neural network structure, for example, by referring to a transfer mode between neurons of a human brain, and can also learn by itself continuously.

The internal memory 121 may include one or more Random Access Memories (RAMs) and one or more non-volatile memories (NVMs).

The random access memory may include static random-access memory (SRAM), dynamic random-access memory (DRAM), synchronous dynamic random-access memory (SDRAM), double data rate synchronous dynamic random-access memory (DDR SDRAM), such as fifth generation DDR SDRAM generally referred to as DDR5 SDRAM, and the like;

the nonvolatile memory may include a magnetic disk storage device, a flash memory (flash memory).

The FLASH memory may include NOR FLASH, NAND FLASH, 3D NAND FLASH, etc. according to the operation principle, the FLASH memory may include single-level cell (SLC), multi-level cell (MLC), etc. according to the level order of the storage unit, and the FLASH memory may include universal FLASH memory (UFS), embedded multimedia memory Card (eMMC), etc. according to the storage specification.

The random access memory may be read and written directly by the processor 110, may be used to store executable programs (e.g., machine instructions) of an operating system or other programs in operation, and may also be used to store data of users and applications, etc.

The nonvolatile memory may also store executable programs, data of users and application programs, and the like, and may be loaded into the random access memory in advance for the processor 110 to directly read and write.

The external memory interface 120 may be used to connect an external nonvolatile memory, so as to expand the storage capability of the terminal.

The terminal can implement an audio function through the audio module 170, the speaker 170A, the receiver 170B, the microphone 170C, the earphone interface 170D, and the application processor. Such as music playing, recording, etc.

The audio module 170 is used to convert digital audio information into an analog audio signal output and also to convert an analog audio input into a digital audio signal. The audio module 170 may also be used to encode and decode audio signals.

The speaker 170A, also called a "horn", is used to convert the audio electrical signal into an acoustic signal. The terminal can listen to music through the speaker 170A or listen to a hands-free call.

The receiver 170B, also called "earpiece", is used to convert the electrical audio signal into an acoustic signal. When the terminal answers a call or voice information, it can answer a voice by placing the receiver 170B close to the human ear.

The microphone 170C, also referred to as a "microphone," is used to convert sound signals into electrical signals.

The earphone interface 170D is used to connect a wired earphone.

The sensor module 180 may include sensors such as a pressure sensor, a magnetic sensor, a fingerprint sensor, and a touch sensor.

The pressure sensor can be used for sensing a pressure signal and converting the pressure signal into an electric signal.

The magnetic sensor includes a hall sensor. The magnetic sensor may be configured to input a high voltage (which may also be referred to as a second voltage) to the voltage input terminal GPIO connected to the gate of the MOS transistor M through the SOC in response to the stylus pen being attached to the terminal.

The fingerprint sensor is used for collecting fingerprints. The terminal can utilize the collected fingerprint characteristics to realize fingerprint unlocking, access to an application lock, fingerprint photographing, fingerprint incoming call answering and the like.

Touch sensors, also known as "touch panels". The touch sensor 180K may be disposed on the display screen 194, and the touch sensor 180K and the display screen 194 form a touch screen, which is also called a "touch screen".

The keys 190 include a power-on key, a volume key, and the like. The keys 190 may be mechanical keys. Or may be touch keys. The terminal may receive a key input, and generate a key signal input related to user setting and function control of the terminal.

The motor 191 may generate a vibration cue.

Indicator 192 may be an indicator light that may be used to indicate a state of charge, a change in charge, or a message, missed call, notification, etc.

The SIM card interface 195 is used to connect a SIM card.

In some embodiments, the aforementioned charge control circuit may be coupled to the processor, and may be configured to input a control voltage to a voltage input GPIO of the charge control circuit. In one possible implementation, the control voltage may be the third threshold voltage (high voltage) mentioned above when the terminal is in a state of charging for other devices, so that the terminal can wirelessly charge for other devices. In a state where the terminal is not charged for another device, the control voltage may be the fourth threshold voltage (low voltage) referred to above, so that the terminal cannot wirelessly charge for another device.

It should be understood that the charging control circuit provided in the embodiment of the present application may be disposed in other charging devices besides the terminal, so as to implement wireless charging, and may not cause the problem of current leakage of the wireless charging circuit.

The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.

As used in the above embodiments, the term "when …" may be interpreted to mean "if …" or "after …" or "in response to determination …" or "in response to detection of …", depending on the context. Similarly, the phrase "in determining …" or "if a (stated condition or event) is detected" may be interpreted to mean "if … is determined" or "in response to …" or "upon detection of (stated condition or event)" or "in response to detection of (stated condition or event)" depending on the context.

In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the application to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by wire (e.g., coaxial cable, fiber optic, digital subscriber line) or wirelessly (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid state disk), among others.

One of ordinary skill in the art will appreciate that all or part of the processes in the methods of the above embodiments may be implemented by hardware related to instructions of a computer program, which may be stored in a computer-readable storage medium, and when executed, may include the processes of the above method embodiments. And the aforementioned storage medium includes: various media capable of storing program codes, such as ROM or RAM, magnetic or optical disks, etc.

Claims

1. A charging control circuit is characterized in that the charging control circuit comprises a power supply and enable control circuit and a wireless charging circuit, the power supply and enable control circuit comprises a BOOST circuit, wherein:

the input end of the wireless charging circuit is connected with the output end of the BOOST circuit; the BOOST circuit is used for transmitting electric energy in a battery to the input end of the wireless charging circuit;

the enabling end of the wireless charging circuit is connected with the power supply and enabling control circuit;

the power supply and enabling control circuit is used for inputting a first control voltage to an enabling end of the wireless charging circuit when the terminal is in a state of charging other equipment, wherein the first control voltage is less than or equal to the enabling voltage of the wireless charging circuit; the power supply and enabling control circuit is further used for inputting a second control voltage to an enabling end of the wireless charging circuit when the terminal is not in a state of charging other equipment, and the second control voltage is greater than the enabling voltage of the wireless charging circuit;

and under the condition that the enabling end of the wireless charging circuit receives the first control voltage and the second control voltage, the enabling end of the wireless charging circuit and the power supply and enabling control circuit are in a conducting state.

2. The method according to claim 1, wherein the charging control circuit further includes a first resistor, and an input terminal of the wireless charging circuit is connected to an output terminal of the BOOST circuit, specifically including:

the input end of the wireless charging circuit is connected with the output end of the BOOST circuit through the first resistor.

3. The charging control circuit according to claim 1 or 2, further comprising a second resistor, a third resistor, a fourth resistor and a MOS transistor, wherein:

the grid electrode of the MOS tube and the enabling end of the BOOST circuit are connected with a voltage input end; a second source electrode of the MOS tube is grounded; the drain electrode of the MOS tube is connected with the first end of the second resistor;

the second end of the second resistor is connected with the first end of the third resistor and the first end of the fourth resistor; the first end of the third resistor is connected with the first end of the fourth resistor;

a second end of the third resistor is connected with an output end of the BOOST circuit;

and the second end of the fourth resistor is connected with the enabling end of the wireless charging circuit.

4. The charge control circuit of claim 3, wherein:

the wireless charging circuit is connected with the wireless charging coil;

when the terminal is in a state of charging other devices through the wireless charging coil, the enable end of the BOOST circuit receives a third control voltage provided by the voltage input end, and the third control voltage is greater than or equal to the enable voltage of the BOOST circuit; and the enabling end of the BOOST circuit receives a fourth control voltage provided by the voltage input end when the terminal is not in a state of charging other equipment through a wireless charging coil, wherein the fourth control voltage is less than the enabling voltage of the BOOST circuit.

5. The charge control circuit of claim 4, wherein:

the conduction voltage of the MOS tube is the same as the voltage value of the enabling voltage of the BOOST circuit;

under the condition that the voltage received by the grid electrode of the MOS tube is greater than or equal to the enabling voltage of the BOOST circuit, the MOS tube is conducted; and under the condition that the voltage received by the grid electrode of the MOS tube is less than the enabling voltage of the BOOST circuit, the MOS tube is not conducted.

6. The charging control circuit according to any one of claims 3 to 5, further comprising N resistors, wherein a set of the N resistors is connected in series with the third resistor to divide the voltage, and wherein N is a positive integer greater than or equal to 1.

7. The method according to any one of claims 2 to 6, characterized in that the first resistor has a value equal to 0 ohm or close to 0 ohm; and under the condition that the resistance value of the first resistor is close to 0 ohm, the resistance value is 50m omega-100 m omega.

8. The method according to any of claims 3-7, characterized in that the fourth resistor has a resistance equal to 0 ohm or close to 0 ohm; and under the condition that the resistance value of the first resistor is close to 0 ohm, the resistance value is 50m omega-10 omega.

9. A terminal, comprising a processor and a charge control circuit, wherein:

the processor is used for inputting a control voltage to the charging control circuit;

the control voltage may be a third control voltage or a fourth control voltage as described in any of the preceding claims 4 to 8;

the charge control circuit is as described in any one of the preceding claims 1 to 8.

10. The terminal of claim 9, wherein when the processor inputs the third control voltage to the charging control circuit, the terminal can wirelessly charge another device; when the processor inputs the fourth control voltage to the charging control circuit, the terminal cannot wirelessly charge other devices.