CN115549230B

CN115549230B - Charging control circuit and terminal

Info

Publication number: CN115549230B
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: 2023-06-23
Anticipated expiration: 2042-01-25
Also published as: CN115549230A

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 is not 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, handwriting pens can be arranged on terminals such as a tablet, a mobile phone and the like. The tablet may be equipped with other devices such as a keyboard. Currently, a terminal can charge other devices such as a handwriting pen or a keyboard in a wireless charging mode.

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

Disclosure of Invention

The application provides a charging control circuit and a terminal, which can close a wireless charging circuit IC when the terminal is not used for charging other equipment under the condition of reducing the manufacturing cost of the wireless control circuit ₂ And the battery leakage is not caused.

In a first aspect, the present application provides a charging control circuit, including a power supply and enable control circuit and a wireless charging circuit, including 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 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 smaller 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 larger 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.

In the above embodiment, the wireless charging circuit is enabled with a low voltage, and when the control voltage received by the wireless charging circuit is the first control voltage, the wireless charging circuit is enabled to be in a low voltage state, so that the terminal can perform wireless charging for other devices. When the control voltage received by the wireless charging circuit is the second control voltage, the control voltage is high, so that the wireless charging circuit can be closed, the terminal can not wirelessly charge other equipment, and the terminal can not receive electric energy transmitted by the battery, so that electric leakage can not be caused.

With reference to the first aspect, in one 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, and specifically includes: 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 embodiment, the first resistor may be R in the exemplary charge control circuit provided in fig. 4 in the embodiment ₃ The MOS tube M in the original scheme is replaced by a first resistor ₁₁ The cost of the first resistor is smaller than that of the MOS tube M ₁₁ The cost of the MOS transistor can be saved while achieving the same beneficial effect.

With reference to the first aspect, in one 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 the voltage input end; the first 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 embodiment, the second resistor may be R in the exemplary charge control circuit provided in fig. 4 in the embodiment ₂ The third resistor may be R in the exemplary charge control circuit provided in FIG. 4 in an embodiment ₁ The fourth resistor may be R in the exemplary charge control circuit provided in FIG. 4 in an embodiment ₄ . When the enabling voltage of the wireless charging circuit is less than or equal to 0.3V, the resistor R ₁ Divided by resistance R ₂ The resistance value of (2) can be in the range of 20 to 45, and the resistance R can be when the MOS tube is conducted ₁ Resistor R ₂ The voltage at the point A is smaller than or equal to 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 Resistor R ₂ The voltage at the point A is larger than that of the wireless charging circuit IC by series voltage division ₂ The enable voltage of (2) is sufficient.

With reference to the first aspect, in one implementation manner, the wireless charging circuit is connected with a wireless charging coil; the terminal receives a third control voltage provided by the voltage input end from the enabling end of the BOOST circuit in a state of charging other equipment through the wireless charging coil, wherein the third control voltage is larger than or equal to the enabling voltage of the BOOST circuit; the terminal is not in a state of charging other devices through the wireless charging coil, and the enabling end of the BOOST circuit receives a fourth control voltage provided by the voltage input end, wherein 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 the other device through the wireless charging coil to perform wireless charging on the other device, when the terminal detects that the other device performs wireless charging through the terminal, a third control voltage may be provided 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 enabling terminal of the BOOST circuit, so that the BOOST circuit may be in a working state, and the wireless charging circuit is also in a working state, so that the terminal may perform charging on 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 for the voltage input end, the fourth control voltage is low, and then the voltage input end transmits the fourth control voltage to the enabling end of the BOOST circuit, so that the BOOST circuit can be in a non-working state, and the wireless charging circuit is closed, so that the terminal can charge other devices, and electric leakage cannot be caused.

With reference to the first aspect, in one implementation manner, 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 larger 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 smaller than the enabling voltage of the BOOST circuit, the MOS tube is not conducted.

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

In the above embodiment, taking N as 1 as an example, referring to fig. 7 in the embodiment, the charging control circuit may further include a resistor R ₅ The resistance R ₅ Is arranged between the point C and the point A and is connected with the resistor R ₁ The voltage division is serially connected to adjust the voltage at point a.

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

In the above embodiment, the first resistor is used to connect the input terminal Vin of the wireless charging circuit with the output terminal Vout of the BOOST circuit, and meanwhile, when the resistance of the first resistor is 50mΩ -100mΩ, the electric energy loss is not too large because the resistance is too large. Wherein, the smaller the resistance value of the first resistor, the smaller the loss of electric energy. For example, near 0 there is little loss.

With reference to the first aspect, in one embodiment, the resistance of the fourth resistor is equal to 0 ohm or close to 0 ohm; in the case where the resistance value of the first resistor is close to 0 ohm, the resistance value thereof is 50mΩ -10Ω.

In the above embodiments, the enabling terminal Vin for connecting the wireless charging circuit with the power supply and enabling control circuit is provided. The fourth resistor may be replaced by other components, such as wires like resistors for jumper wires, etc., which function 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 preceding aspects; the charge control circuit is a charge control circuit as described in any one of the preceding first 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 perform wireless charging for other devices; when the processor inputs the fourth control voltage to the charge control circuit, the terminal may not wirelessly charge other devices.

In the above embodiment, when the terminal detects that other devices are 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 devices. 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 terminal, the fourth control voltage is low, and the terminal cannot wirelessly charge the 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 a wireless charging process;

FIG. 3 is a schematic diagram of a charge control circuit involved in one approach;

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

FIG. 5 is a graph of voltage analysis involved in an embodiment of the present application;

FIG. 6 is another voltage analysis diagram involved in an embodiment 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 provided in an embodiment of the present application.

Detailed Description

The terminology used in the following embodiments of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the specification 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 to the contrary. It should also be understood that the term "and/or" as used in this application refers to and encompasses any or all possible combinations of one or more of the listed items.

The terms "first," "second," and the like, are used below 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 defining "a first" or "a second" may explicitly or implicitly include one or more such feature, and in the description of embodiments of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.

The embodiment of the application provides a charging control circuit and a terminal, which can be applied to the process of wireless charging of other equipment by the terminal. The terminal is a device for providing power, and may also be referred to as a transmitting 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 power 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.

In the embodiment of the present application, other devices are taken as an example of a handwriting pen. It should be understood that no limitation with respect to the embodiments of the present application is thereby intended.

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 a wireless charging process.

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

As shown in fig. 1, a wireless charging coil 201 is disposed in the stylus pen 200. The top 101 of the terminal 100 is provided with a wireless charging coil (not shown in the figures). The user may attach stylus 200 to top 101 of terminal 100. Further, the wireless charging coil of the terminal 100 may interact with the wireless charging coil of the stylus 200 to transmit the electric energy of the terminal 100 to the stylus 200, i.e. to charge the stylus 200. During the process of charging the stylus 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: the terminal 100 is currently charging the stylus 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.

The wireless charging coil referred to above may also be referred to as a charging coil, where possible. The wireless charging coil 112 may also be referred to as a transmitting coil, and the wireless charging coil 212 may also be referred to as a receiving coil.

When the terminal 100 wirelessly charges the handwriting pen 200, the charging control circuit 111 of the terminal 100 may obtain a corresponding direct current signal from the battery 110. Further, the charging 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, the stylus 200 may induce an alternating electromagnetic field emitted from the wireless charging coil 112 through the wireless charging coil 212, thereby generating an alternating electrical signal, and input the alternating electrical signal to the charging control circuit 211. The charging control circuit 211 may rectify the alternating electric signal into a direct current electric signal, and input the direct current electric signal to the battery 210 to charge the battery 210, thereby realizing wireless charging.

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

The battery according to the following embodiments is referred to as a battery of a terminal when not specifically described, and the charging control circuit is referred to as a charging control circuit of the terminal when not specifically described, and the wireless charging coil is referred to as a wireless charging coil of the terminal when not specifically described.

From the foregoing, it is known that to implement wireless charging for a handwriting pen, the terminal is required 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 one approach.

In one possible implementation, as shown in FIG. 3, a BOOST circuit IC may be included in the charge control circuit ₁ Wireless charging circuit IC ₂ Resistance R ₁₁ Resistance R ₁₂ Resistance R ₁₃ MOS tube M ₁₁ MOS tube M ₁₂ . BOOST circuit IC ₁ Output terminal V of (2) _out Through wiring and wireless charging circuit IC ₂ Input terminal V of (2) _in And (5) connection. Wireless charging circuit IC ₂ Is enabled at a low level, i.e. when the wireless charging circuit IC ₂ Control voltage (V) received by enable terminal nEN ₁₁ ) At low voltage, the wireless charging circuit IC can be enabled ₂ Is in an operating 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 (2) _in Is less than the system electrical voltageThe pressure may be between 2.75V and 2.95V.

It should be understood herein that wireless charging circuit IC ₂ The control voltage of the enable terminal nEN defaults to a low voltage, i.e. the wireless charging circuit IC ₂ Always satisfying this state of low level enable. The realization method comprises the following steps: resistor R ₁₃ One end of (a) a wireless charging circuit IC ₂ Enable terminal nEN connection, 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 low voltage provided by enable terminal nEN allows it to be in an operational state. Wherein the first chip may be a processor (central processing unit, CPU) of the terminal.

In which the circuit does not include MOS transistor M ₁₁ In the case of (2) due to the BOOST circuit IC ₁ Output terminal V of (2) _out Is always larger than the wireless charging circuit IC ₂ Input terminal V of (2) _in Is locked by the undervoltage of the battery, and the wireless charging circuit IC ₂ The control voltage of the enable terminal nEN is low, so that the wireless charging circuit IC can be enabled ₂ In a standby state. When the terminal is not charging other devices, the wireless charging circuit IC ₂ While in standby state, the battery still passes through the BOOST circuit IC ₁ Wireless charging circuit IC ₂ An electrical signal is transmitted, resulting in leakage. In the scheme, in order to solve the leakage problem, a MOS tube M is added ₁₁ So that the MOS tube M is closed under the condition that the terminal does not charge other equipment ₁₁ . The specific implementation mode is as follows: MOS tube M ₁₁ Source (which may correspond to point S in fig. 3) and BOOST circuit IC ₁ Output terminal V of (2) _out Connection, MOS tube M ₁₁ Drain of (may correspond to point D in fig. 3) and wireless charging circuit IC ₂ Input terminal V of (2) _in Connection, MOS tube M ₁₁ A gate (which may correspond to point G in FIG. 3) and a resistor R ₁₂ Resistor R ₁₂ Is connected to one end of the connecting rod. Can pass through the resistor R ₁₁ Resistor R ₁₂ Control MOS tube M ₁₁ The voltage of the grid electrode of the MOS tube M ₁₁ Is not equal to the gate-source voltage of (C)Meeting the conduction condition, the MOS tube M is enabled to be ₁₁ Is not conductive. The gate-source voltage is the difference between the voltage of the gate and the voltage of the source. In general, in this scheme, the resistor R ₁₂ Resistor R ₁₂ The above description can be satisfied by a resistance value of 10 kiloohms (kΩ).

Thus, the BOOST circuit IC can be disconnected ₁ Output terminal V of (2) _out With wireless charging circuit IC ₂ Input terminal V of (2) _in Connected, the battery cannot pass through the BOOST circuit IC ₁ Wireless charging circuit IC ₂ Transmitting an electrical signal to enable the wireless charging circuit IC ₂ Can be closed.

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 wireless charging circuit IC can be closed when the terminal does not charge other equipment ₂ And the battery leakage is not 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 include a BOOST circuit IC ₁ Wireless charging circuit IC ₂ Resistance R ₁ Resistance R ₂ Resistance R ₃ Resistance R ₄ And a MOS tube M. Wherein the resistance R ₃ For connecting BOOST circuit IC ₁ Output terminal V of (2) _out With wireless charging circuit IC ₂ Input terminal V of (2) _in . Resistor R ₄ May also be referred to as a first terminal) and a wireless charging circuit IC ₂ Enable terminal nEN connection, resistor R ₄ The other end (also called the second end) of (a) and a resistor R ₁ Resistor R ₂ Is connected to one end of the connecting rod. Resistor R ₁ And the other end of the (B) and the BOOST circuit IC ₁ Output terminal V of (2) _out And (5) connection. Resistor R ₂ The other end of the transistor is connected with the drain electrode (which can correspond to the point D in fig. 4) of the MOS transistor M. The source electrode (corresponding to the point S in FIG. 4) of the MOS transistor M is grounded, and the gate electrode (corresponding to the point G in FIG. 4) of the MOS transistor M is used for inputting the control voltage V ₁ . Grid electrode of MOS tube M and BOOST-circuit IC ₁ The enable terminals EN of (a) are connected with voltage input terminals (corresponding to GPIO in FIG. 4), the voltage input terminals GPIO can be provided by a second chip in the SOC of the terminal, and the second chip can supply voltage to the grid of the MOS transistor M and the BOOST circuit IC through the voltage input terminals GPIO ₁ Enable terminal EN of (a) inputs 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, BOOST circuit IC ₁ Is enabled by high voltage, i.e. control voltage V received by enable terminal EN of BOOST circuit IC1 ₁ At high voltage, the wireless charging circuit IC can be enabled ₂ Is in an operating state. Wireless charging circuit IC ₂ Is enabled by low voltage, i.e. wireless charging circuit IC ₂ When the control voltage of the enable terminal nEN is low, the wireless charging circuit IC can be enabled ₂ Is in an operating state.

It should be appreciated that the wireless charging circuit IC ₂ When the control voltage received by the enable terminal nEN is less than or equal to the first threshold voltage, the control voltage is low. Wireless charging circuit IC ₂ When the control voltage received by the enable terminal nEN is greater than or equal to the second threshold voltage, the control voltage is high (not low). Wherein the first threshold voltage is smaller than the wireless charging circuit IC ₂ The second voltage threshold is greater than or equal to the enable voltage of the wireless charging circuit IC ₂ Is set to the enable voltage of (1). BOOST circuit IC ₁ When the control voltage received by the enable end EN is greater than or equal to the third threshold voltage, the control voltage is a high voltage. BOOST circuit IC ₁ When the control voltage received by the enable end EN of (i) is less than or equal to the fourth voltage threshold, the control voltage is low (not high), wherein the third threshold voltage is greater than or equal to the BOOST circuit IC ₁ The fourth voltage threshold is smaller than the BOOST circuit IC ₁ Is set to the enable voltage of (1). In one possible case, a wireless charging circuit IC ₂ The enable voltage of (a) may be 1.8V, BOOST circuit IC ₁ The enable voltage of (2) may be 0.3V, less than the BOOST circuit IC ₁ Output terminal V of (2) _out Voltage of (2)。

The charge control circuit provided in fig. 4 differs from the charge control circuit referred to in the foregoing scheme in two points:

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

(2) In contrast to the charge control circuit shown in fig. 3, in the charge control circuit according to the embodiment of the present application, the wireless charge circuit IC is not connected to the first chip (e.g., processor) ₂ The enable terminal nEN of (a) inputs a default low voltage as the control voltage (e.g., V in fig. 3 ₁₁ ) To control wireless charging circuit IC ₂ Is not in the operating state. In the embodiment of the application, the wireless charging circuit IC ₂ The enable terminal nEN of (1) is connected with the power supply and enable control circuit for receiving the control voltage V output by the power supply and enable control circuit _B . Thus, the wireless charging circuit IC can be regulated by the power supply and enable control circuit ₂ The enable terminal nEN of the wireless charging circuit IC ₂ Can be in an operating state or an inactive state.

It should be understood that the resistor R ₁ Cost ratio MOS tube M ₁₁ As can be seen from the lower cost of (3) and (4), the resistor R is used ₁ Substitute MOS tube M ₁₁ The manufacturing cost of the charging control circuit can be saved, meanwhile, the terminal can perform wireless charging on other equipment, and when the terminal does not charge the other equipment, the wireless charging circuit IC can be turned off ₂ And the battery leakage is not caused.

Wherein the power supply and enable control circuit comprises a resistor R ₄ Resistance R ₁ Resistance R ₂ And a MOS tube M. Wherein the resistance R ₄ Resistance R ₁ Resistance R ₂ Connection of MOS tube MThe relationship may refer to the foregoing description of the charge control circuit, and will not be repeated here. The power supply and enable control circuit is used for adjusting the wireless charging circuit IC ₂ Control voltage of enable terminal nEN. Wherein, wireless charging circuit IC ₂ The control voltage of the enable terminal nEN corresponds to the voltage at point B in the graph.

The resistor R ₄ One end of (a) a wireless charging circuit IC ₂ The enable terminal nEN of the resistor R ₄ The other end of (2) corresponds to the point A. The voltage of point A is recorded as V _A The voltage at point B is recorded as V _B It will be appreciated herein that V _A ＝V _B . Subsequent discussion of voltage V at point A _A Instead of the voltage V at point B _B . When the voltage at the point A is low, the voltage at the point B is also low, and the wireless charging circuit IC ₂ Control voltage (V) received by enable terminal nEN _B ) At the time of low voltage, the wireless charging circuit IC ₂ Can be in an operating state or a standby state. When the voltage at the point A is high, the voltage at the point B is also high, and the wireless charging circuit IC ₂ Control voltage (V) received by enable terminal nEN _B ) At this time, the wireless charging circuit IC is high voltage ₂ May be in a closed state.

The wireless charging circuit IC according to the foregoing aspect ₂ The terminal can be in a working state, namely, the terminal can charge the handwriting pen wirelessly, and the conditions to be met include the following two conditions:

condition 1: wireless charging circuit IC ₂ Input terminal Vin and BOOST circuit IC of (a) ₁ Is conductive and receives the power output from the battery (i.e., receives the power from the battery). And wireless charging circuit IC ₂ The voltage of the input end Vin of the voltage regulator is larger than or equal to a first working voltage, and the value of the first working voltage is larger than that of the BOOST circuit IC ₁ When in the off state, the BOOST circuit IC ₁ Is provided, the voltage at the output terminal Vout of (a).

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

The wireless charging of the foregoing aspectElectric circuit IC ₂ The terminal may be in an off state, that is, the terminal may perform wireless charging for the handwriting pen, and the condition to be satisfied may be at least one of the following condition 3 or condition 4:

condition 3: condition 2 described above is not satisfied, that is, the wireless charging circuit IC ₂ The enable terminal nEN of (a) receives a control voltage of high voltage.

Condition 4: wireless charging circuit IC ₂ Input terminal Vin and BOOST circuit IC of (a) ₁ Is not conductive.

The wireless charging circuit IC according to the foregoing aspect ₂ The state of standby refers to a state that the terminal cannot wirelessly charge the handwriting pen, but consumes the electric quantity in the battery, and is to be avoided in 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 this embodiment of the present application, it is necessary to make the terminal not in a state of charging the handwriting pen, so that the wireless charging circuit IC ₂ Can be in an off state, thus enabling the wireless charging circuit IC ₂ The electric signal in the battery can not be received, and the electric leakage of the battery can not be caused.

It should be understood that in the charge control circuit shown in fig. 4, the condition 4 referred to above is not satisfied all the time regardless of whether the terminal is charging the handwriting pen, because: wireless charging circuit IC ₂ Output terminal V of (2) _out Is approximately equal to the system voltage (3.5V-4.4V), but the wireless charging circuit IC ₂ Input terminal V of (2) _in The undervoltage lockout voltage (which may be between 2.75V-2.95V) is less than the system voltage. BOOST circuit IC ₁ Output terminal V of (2) _out With wireless charging circuit IC ₂ Input terminal V of (2) _in Through resistance R ₃ And (5) connection. This represents a BOOST circuit IC ₁ Output terminal V of (2) _out With wireless charging circuit IC ₂ Input terminal V of (2) _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, it is possible to make no by making condition 3 holdWire charging circuit IC ₂ Can be closed and can not cause electric leakage.

It should be understood that the following scenarios are included, but not limited to, when the terminal is in a state of charging a stylus:

scene 1: as shown in fig. 1, the stylus being attracted to the terminal indicates that the terminal is in a state of charging the stylus. One possible way is for the terminal to charge the stylus via a wireless charging coil.

Scene 2: the terminal may be provided with a housing means in which the stylus is accommodated, the housing means being operable to indicate to a user that the terminal is in a state of charging the stylus when the user places the stylus in the housing means. One possible way is for the terminal to charge the stylus via a wireless charging coil.

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

The following describes, in conjunction with the charge control circuit shown in fig. 4, that the terminal may turn off the wireless charging circuit IC when not charging other devices, respectively ₂ The principle that the battery is not leaked is described by the working principle that the terminal charges the handwriting pen through the charging control circuit.

When the terminal is not charging other devices, the wireless charging circuit IC can be turned off ₂ The principle of not causing battery leakage may be referred to as follows.

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

In the control circuit referred to in fig. 4, a wireless charging circuit IC is made ₂ The principle that the control voltage received by the enable terminal nEN is not a low voltage can be described 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 transistor M is conducted when the gate-source voltage is greater than or equal to the conducting voltage. 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 formula (1), V _gs (M) represents the gate-source voltage of the MOS transistor M. Wherein V is _gs (M)＝V _g (M)-V _s (M)，V _g (M) represents the gate voltage of MOS transistor M, V _s (M) represents the source voltage of MOS transistor M. V (V) _th (M) represents the on voltage of the MOS transistor M. The voltage value of the on-voltage can be set to be the same as that of the BOOST circuit IC ₁ The voltage values of the enable voltages of (a) are the same.

Under the condition that the terminal does not charge other devices, the SOC of the terminal may input a low voltage (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 the BOOST circuit IC ₁ Due to the BOOST circuit IC ₁ The enable voltage of (a) is equal to the turn-on voltage of the MOS transistor M, 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, V _s (M) =0v. From this, 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 turned on. Then the voltage at point A is V _A Equal to BOOST circuit IC ₁ Output terminal V of (2) _out Is set in the above-described voltage range. In combination with the above, the wireless charging circuit IC ₂ Control voltage received by enable terminal nEN (i.e. voltage V at point B _B ) Voltage V equal to point A _A Wireless charging circuit IC ₂ The enable terminal nEN of (a) receives a control voltage equal to the BOOST circuit IC ₁ Output terminal V of (2) _out Is set in the above-described voltage range. Thus, the wireless charging circuit IC ₂ The enable terminal nEN of (1) receives a control voltage greater than or equal to the second threshold voltage (i.e. the control voltage is high, condition 2 is not satisfied), so that the wireless charging circuit IC ₂ Can be in a closed stateNo leakage is caused.

In one possible implementation manner, the manner in which the SOC of the terminal may input a 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 state of wirelessly charging the stylus pen, the second chip can input a first voltage to the grid electrode of the MOS tube M through the voltage input end GPIO.

Wherein the voltage V at the point B _B Equal to BOOST circuit IC ₁ Output terminal V of (2) _out The analysis of the voltage of (a) can be described below.

As shown in fig. 5, the BOOST circuit IC ₁ Output terminal V of (2) _out Corresponding to point C in fig. 5, the ground point to which the drain electrode of the MOS transistor M is connected corresponds to point D 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 the point C to the point D is in an off state, and a circuit from the point C to the point B is in a conducting state, so that the voltage of the point A is determined by the circuit from the point C to the point B. Since there is no voltage difference between C and B, the resistor R ₁ Resistance R ₄ Will not divide pressure, V _B And V is equal to _A Equal to voltage V at point C _C Equal, V _C Is a BOOST circuit IC ₁ Output terminal V of (2) _out Which may be referred to as Vout'.

For the working principle of the terminal for charging the handwriting pen through the charging control circuit, reference may be made to the following description.

In a state where the terminal is charging the stylus pen, it is necessary to make both the condition 1 and the condition 2 mentioned above true to realize charging the stylus pen.

Among them, the description that makes condition 1 satisfied may refer to the following description.

When BOOST circuit IC ₁ Condition 1 may be satisfied if in an operational state, where a BOOST circuit IC ₁ In an operating state ofFinger BOOST circuit IC ₁ Can be brought to a high voltage (also referred to as a second voltage) such that the BOOST circuit IC ₁ The voltage of the output terminal Vout of the wireless charging circuit IC can be raised from the system voltage (3.5V-4.4V) to a second working voltage which is larger than the wireless charging circuit IC ₂ When the resistance of the resistor R3 is 0Ω or is close to 0Ω, such as 50mΩ -100deg.mΩ, the wireless charging circuit IC can be made to ₂ The voltage at the input Vin of (a) is approximately equal to the second operating voltage (greater than the first operating voltage), so that condition 1 is satisfied. Wherein the resistance R ₃ The resistance value of the circuit is 0 omega or is close to 0 omega, the 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 overlarge electric signal loss caused by overlarge resistance value cannot be caused, so that the terminal is in a state of wirelessly charging the handwriting pen, and the wireless charging circuit IC can be used for charging the handwriting pen ₂ Is closer to the BOOST circuit IC ₁ A second operating voltage of the wireless charging circuit IC ₂ A first operating voltage of the input terminal Vin of (a) such that the wireless charging circuit IC ₂ And entering a working state, and transmitting the received electric signals of the battery to the wireless charging coil.

Wherein condition 2 is immediately to make the wireless charging circuit IC ₂ The enable terminal nEN of (a) receives a control voltage of low voltage. The description that makes condition 2 satisfied may refer to the following description.

In the charge control circuit referred to in fig. 4, a wireless charge circuit IC is made ₂ The principle that the enable terminal nEN receives the control voltage of low voltage can be described as follows.

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

In one possible implementation, a hall sensor may be disposed in the terminal, and in response to the operation of adsorbing the stylus pen to the terminal, the hall sensor may input a high voltage to the voltage input terminal GPIO connected to the gate of the MOS transistor M through the SOC (may also be referred to asSecond voltage) so that the gate voltage of the MOS transistor M is the second voltage. The second voltage is greater than or equal to the BOOST circuit IC ₁ Due to the BOOST circuit IC ₁ The enable voltage of (a) is equal to the turn-on voltage of the MOS transistor M, 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, V _s (M) =0v. From this, the gate-source voltage of the MOS transistor M is greater than the turn-on voltage, i.e., V _gs (M)>V _th (M), the MOS transistor M is turned on. Then the voltage at point A is V _A May be smaller than or equal to the wireless charging circuit IC ₂ An enable voltage of an enable terminal nEN of (a). In combination with the above, the wireless charging circuit IC ₂ Control voltage received by enable terminal nEN (i.e. voltage V at point B _B ) Voltage V equal to point A _A Wireless charging circuit IC ₂ The enable terminal nEN of (a) receives a control voltage less than or equal to the wireless charging circuit IC ₂ Is set to the enable voltage of (1). Thus, the wireless charging circuit IC ₂ The enable terminal nEN of (1) receives a control voltage less than or equal to the first threshold voltage (i.e. the control voltage is low, condition 2 is true), so that the wireless charging circuit IC ₂ If the terminal can be in a working state, both the condition 1 and the condition 2 are satisfied, and the terminal can charge the handwriting pen.

In one 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 state of wirelessly charging the stylus pen, the second chip can input a second voltage to the grid electrode of the MOS tube M through the voltage input end GPIO.

Wherein the voltage V at the point B _B Less than or equal to a wireless charging circuit IC ₂ The process of analyzing the enabling voltage of (a) may be described below.

As shown in fig. 6, the BOOST circuit IC ₁ Output terminal V of (2) _out Corresponding to point C in FIG. 6, the ground point to which the drain of MOS transistor M is connected corresponds to point D in FIG. 6, in the charge control circuit shown in FIG. 4Points a and B correspond to points a and B, respectively, in fig. 6.

Under the condition that the MOS tube M is conducted, a circuit from the point C to the point B is in a conducting state, but no voltage difference exists, however, a circuit from the point C to the point D is in a conducting state, and the voltage of the point A is determined by the circuit from the point C to the point D. Voltage V at point C _C Is a BOOST circuit IC ₁ Output terminal V of (2) _out The voltage of (2) may be noted as Vout', i.e., V _C ＝V _out . The point D is grounded, the voltage V of the point D _D =0v. In the circuit from point C to point D, there is a resistor R ₁ Resistor R ₂ The voltage at point a can be referred to as the following equation (2) by dividing the voltage in series.

In the above formula (2), vout' represents a BOOST circuit IC ₁ Output terminal V of (2) _out Voltage of R' ₁ Representing the resistance R ₁ Resistance value of R' ₂ Representing the resistance R ₂ Resistance value of (2).

As can be seen by referring to equation (2), the resistor R can be configured ₁ Resistance value of (2) and resistance R ₂ The voltage of the point B is regulated to be smaller than or equal to the voltage of the wireless charging circuit IC ₂ For example, R' ₁ ＝150KΩ，R′ ₂ =4.7kΩ. Resistor R ₁ Resistance value of (2) and resistance R ₂ Other configurations of the resistance value of (C) are also possible, e.g., R' ₁ ＝160KΩ，R′ ₂ =5kΩ, for example, when the enable voltage of the wireless charging circuit is less than or equal to 0.3V, resistor R ₁ Divided by resistance R ₂ The resistance of (c) may range between 20 and 45. Can realize the resistance R ₁ Resistor R ₂ The voltage at the point A is smaller than or equal to the wireless charging circuit IC through serial voltage division ₂ The enable voltage of (2) is sufficient. The embodiment of the application is to resistor R ₁ Resistance value of (2) and resistance R ₂ Resistance value of (2)The size is not limited, so long as the resistor R can be used when the MOS tube M is conducted ₁ Resistor R ₂ The voltage at the point A is smaller than or equal to the wireless charging circuit IC through serial voltage division ₂ The enable voltage of (2) is sufficient.

In one possible implementation, a wireless charging circuit IC ₂ Can be set to 0.5V at R' ₁ ＝150KΩ，R′ ₂ In the case of =4.7kΩ, the voltage at point a may be 0.15V, and since the voltage at point B is equal to the voltage at point a, the wireless charging circuit IC ₂ The received control voltage (0.15V) is smaller than the wireless charging circuit IC ₂ An enable voltage (0.5V) of the wireless charging circuit IC ₂ In the working state, the battery can receive the electric signal transmitted by the battery and charge the handwriting pen.

It should be appreciated that the wireless charging circuit IC ₂ The enabling voltage of (a) may be set to 0.5V by way of example, and should not be construed as limiting the embodiments of the present application, but may be set to other values, such as 0.4V, etc., which are not limited by the embodiments of the present application.

It should be understood that the foregoing hall sensor is merely illustrative for detecting whether the terminal is in a state of charging the stylus pen, and in other cases, other components may be substituted for the hall sensor, for example, a pressure sensor, which may detect a change in gravity when the stylus pen is adsorbed to the terminal, so that the pressure sensor may 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 in this regard.

It should be understood that the foregoing charge control circuit shown in fig. 4 is merely an exemplary illustration, and that other examples are possible, and that other components that achieve the same purpose may be used in place of one or more of the components. Multiple components in the charge control circuit may also be combined. Other examples of such charge control circuits may be referred to the following description:

Other examples 1: MOS tube in the charge control circuit shown in FIG. 4M can be other components besides NMOS tubes. For example, the single pole double throw switch can be used for controlling the resistor R, and the function of the switch is consistent with that of the MOS tube M ₂ Whether to connect with point D. Wherein, the control voltage received by the single-pole double-throw switch can be set to be more than or equal to the BOOST circuit IC ₁ Enable voltage of (1) to make resistor R ₂ Is connected with the point D, and the control voltage received by the single-pole double-throw switch is smaller than that received by the BOOST circuit IC ₁ Enable voltage of (1) to make resistor R ₂ Is not connected with the point D.

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

Other examples 3: the resistor R referred to in FIG. 4 ₃ Other components, e.g. conductors like resistors for jumper wires, which function as resistors R ₃ The same is used for connecting the input end Vin of the wireless charging circuit and the output end Vout of the BOOST circuit, and meanwhile, the electric signal loss is not overlarge because of overlarge resistance value. For another example, the input terminal Vin of the wireless charging circuit and the output terminal Vout of the BOOST circuit may be directly connected through a wire, and other components are not connected in the middle.

Other examples 4: the resistor R referred to in FIG. 4 ₄ The resistance of (C) is 0 Ω or near 0 Ω, for example 50mΩ -10Ω, and the resistance may be higher than the resistance R ₃ Larger. Resistor R ₄ The wireless charging circuit is used for connecting an enabling end Vin of the wireless charging circuit with a power supply and enabling control circuit. R is R ₄ Other parts may be substituted, e.g. conductors like resistors for jumper wires, which function as resistors R ₄ The same applies.

In the embodiment of the application, the BOOST circuit IC ₁ And the method can also be called a BOOST circuit, and similarly, other Chinese and English-containing nouns can be replaced by the former Chinese. For example, wireless charging circuit IC ₂ The voltage input terminal GPIO may also be referred to as a voltage input terminal, etc., and may also be referred to as a wireless charging circuit. Resistor R ₁ May also be referred to as a third resistor, resistor R ₂ May also be referred to as a second resistor, resistor R ₃ May also be referred to as a first resistor, resistor R ₄ 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, a second resistor (R ₂ ) The other end of the second resistor may be referred to as the second end. 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, the third 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, except when charging the stylus pen, and may use the charging control circuit in the embodiment of the present application when charging other devices, and the embodiment of the present application is only exemplified by the stylus pen, and should not be construed as limiting the embodiment of the present application. For example, the other device may be a keyboard.

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

The embodiments are specifically described below with reference to a terminal. It should be understood that the terminal may have more or less components than those shown in the figures, may combine two or more components, or may have different configurations 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: processor 110, external memory interface 120, internal memory 121, universal serial bus (universal serial bus, USB) interface 130, charge management module 140, battery 142, antenna 1, antenna 2, mobile communication module 150, wireless communication module 160, audio module 170, speaker 170A, receiver 170B, microphone 170C, headset interface 170D, sensor module 180, keys 190, motor 191, indicator 192, camera 193, display 194, and subscriber identity module (subscriber identification module, SIM) card interface 195, etc.

It should be understood that the structure illustrated in the embodiments of the present application does not constitute a specific limitation on the terminal. In other embodiments of the present application, the terminal may include more or less components than illustrated, or certain components may be combined, or certain components may be split, or different arrangements of components. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

The processor 110 may include one or more processing units, such as: the processor 110 may include an application processor (application processor, AP), a modem processor, a graphics processor (graphics processing unit, GPU), an image signal processor (image signal processor, ISP), a controller, a memory, a video codec, a digital signal processor (digital signal processor, DSP), a baseband processor, and/or a neural network processor (neural-network processing unit, NPU), etc. Wherein the different processing units may be separate devices or may be integrated in one or more processors.

The controller can be a neural center and a command center of the terminal. The controller can generate operation control signals according to the instruction operation codes and the time sequence signals to finish the control of instruction fetching and instruction execution.

A memory may also be provided in the 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 the processor 110 has just used or recycled. If the processor 110 needs to reuse the instruction or data, it can be called directly from the memory. Repeated accesses are avoided and the latency of the processor 110 is reduced, thereby improving the efficiency of the system.

In some embodiments, the processor 110 may include one or more interfaces. The interfaces may include an integrated circuit (inter-integrated circuit, I2C) interface, an integrated circuit built-in audio (inter-integrated circuit sound, I2S) interface, a pulse code modulation (pulse code modulation, PCM) interface, a subscriber identity module (subscriber identity module, SIM) interface, and/or a universal serial bus (universal serial bus, USB) interface, among others.

It should be understood that the connection relationship between the modules illustrated in the embodiments of the present application is only illustrative, and does not limit the structure of the terminal. In other embodiments of the present application, the terminal may also use different interfacing manners in the foregoing embodiments, or a combination of multiple interfacing manners.

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

The charge management module 140 includes a charge 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, for wirelessly charging other devices.

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

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

The mobile communication module 150 may provide a solution for wireless communication including 2G/3G/4G/5G or the like applied on the terminal. The mobile communication module 150 may include at least one filter, switch, power amplifier, low noise amplifier (low noise amplifier, LNA), etc.

The modem processor may include a modulator and a demodulator. The modulator is used for modulating the 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 wireless local area networks (wireless local area networks, WLAN), such as wireless fidelity (wireless fidelity, wi-Fi) networks, bluetooth (BT), etc.

In some embodiments, the terminal's antenna 1 is coupled to the mobile communication module 150 and the antenna 2 is coupled to the wireless communication module 160 so that the terminal can communicate with the network and other devices through wireless communication techniques. The wireless communication technology may include the global system for mobile communications (global system for mobile communications, GSM), general packet radio service (general packet radio service, GPRS), etc.

The terminal implements display functions 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 194 and the application processor. The GPU is used to perform mathematical and geometric calculations for graphics rendering. Processor 110 may include one or more GPUs that execute program instructions to generate or change display information.

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

The terminal may implement photographing functions through an ISP, a camera 193, a video codec, a GPU, a display 194, an application processor, and the like.

The ISP is used to process 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 onto the photosensitive element. The photosensitive element may be a charge coupled device (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 other digital signals besides digital image signals. For example, when the terminal selects a frequency bin, the digital signal processor is used to fourier transform the frequency bin energy, etc.

Video codecs are used to compress or decompress digital video. The terminal may support one or more video codecs. In this way, the terminal may play or record video in multiple encoding formats, such as: dynamic picture experts group (moving picture experts group, MPEG) 1, MPEG2, MPEG3, MPEG4, etc.

The NPU is a neural-network (NN) computing processor, and can rapidly process input information by referencing a biological neural network structure, for example, referencing a transmission mode between human brain neurons, and can also continuously perform self-learning.

The internal memory 121 may include one or more random access memories (random access memory, RAM) and one or more non-volatile memories (NVM).

The random access memory may include a static random-access memory (SRAM), a dynamic random-access memory (dynamic random access memory, DRAM), a synchronous dynamic random-access memory (synchronous dynamic random access memory, SDRAM), a double data rate synchronous dynamic random-access memory (double data rate synchronous dynamic random access memory, DDR SDRAM, such as fifth generation DDR SDRAM is commonly referred to as DDR5 SDRAM), etc.;

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

The FLASH memory may include NOR FLASH, NAND FLASH, 3D NAND FLASH, etc. divided according to an operation principle, may include single-level memory (SLC), multi-level Memory (MLC), etc. divided according to a memory cell potential order, and may include universal FLASH memory (english: universal FLASH storage, UFS), embedded multimedia memory card (embedded multi media Card, eMMC), etc. divided according to a memory specification.

The random access memory may be read directly from and written to by the processor 110, may be used to store executable programs (e.g., machine instructions) for an operating system or other on-the-fly programs, may also be used to store data for users and applications, and the like.

The nonvolatile memory may store executable programs, store data of users and applications, 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 to realize expansion of the memory capability of the terminal.

The terminal may implement audio functions through an audio module 170, a speaker 170A, a receiver 170B, a microphone 170C, an earphone interface 170D, an application processor, and the like. 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 referred to as a "horn," is used to convert audio electrical signals into sound signals. The terminal can listen to music through the speaker 170A or to hands-free conversations.

A receiver 170B, also referred to as a "earpiece", is used to convert the audio electrical signal into a sound signal. When the terminal picks up a call or voice message, the voice can be picked up by placing the receiver 170B close to the human ear.

Microphone 170C, also referred to as a "microphone" or "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 pressure sensors, magnetic sensors, fingerprint sensors, and touch sensors.

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 used to input a high voltage (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 operation of the stylus pen to be attracted to the terminal.

The fingerprint sensor is used for collecting fingerprints. The terminal can utilize the fingerprint characteristic of gathering to realize fingerprint unblock, visit application lock, fingerprint is photographed, fingerprint answer incoming call etc..

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, etc. The keys 190 may be mechanical keys. Or may be a touch key. The terminal may receive key inputs, generating key signal inputs related to user settings of the terminal as well as function controls.

The motor 191 may generate a vibration cue.

The indicator 192 may be an indicator light, may be used to indicate a state of charge, a change in charge, a message indicating a missed call, a 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 aforementioned third threshold voltage (high voltage) while the terminal is in a state of charging the other device, so that the terminal may wirelessly charge the other device. In a state in which the terminal is not charged for other devices, the control voltage may be the fourth threshold voltage (low voltage) as mentioned above, so that the terminal may not wirelessly charge other devices.

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

The above embodiments are merely for illustrating the technical solution 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 scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions 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 …" depending on the context. Similarly, the phrase "at the time of determination …" or "if detected (a stated condition or event)" may be interpreted to mean "if determined …" or "in response to determination …" or "at the time of detection (a stated condition or event)" or "in response to detection (a stated condition or event)" depending on the context.

In the above embodiments, it may be implemented in whole or in part 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, produces a flow or function in accordance with embodiments of the present application, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. 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 a wired (e.g., coaxial cable, fiber optic, digital subscriber line), or wireless (e.g., infrared, wireless, microwave, etc.). The computer readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that contains an integration of one or more 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), etc.

Those of ordinary skill in the art will appreciate that implementing all or part of the above-described method embodiments may be accomplished by a computer program to instruct related hardware, the program may be stored in a computer readable storage medium, and the program may include the above-described method embodiments when executed. And the aforementioned storage medium includes: ROM or random access memory RAM, magnetic or optical disk, etc.

Claims

1. The charging control circuit is characterized by comprising a power supply and enabling control circuit and a wireless charging circuit, wherein the power supply and enabling control circuit comprises a BOOST circuit, and the BOOST circuit comprises a power supply circuit, a BOOST circuit and a BOOST circuit, wherein the power supply circuit is connected with the BOOST circuit, and the BOOST circuit is connected with the BOOST circuit.

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 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 adjusting the control voltage of the enabling end of the wireless charging 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 in a state that the terminal charges other equipment, and the first control voltage is smaller 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 the enabling end of the wireless charging circuit in a state that the terminal is not used for charging other equipment, and the second control voltage is larger 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; whether the wireless charging circuit enters an operating state is determined based on a control voltage received by the enabling terminal.

2. The charge control circuit of claim 1, further comprising a first resistor, wherein an input of the wireless charge circuit is connected to an output of the BOOST circuit, and specifically comprising:

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

3. The charge control circuit of claim 2, wherein the power supply and enable control circuit further comprises 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 the voltage input end; the first 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;

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

4. A charge control circuit according to claim 3, wherein:

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

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

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

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

when the voltage received by the grid electrode of the MOS tube is larger 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 smaller than the enabling voltage of the BOOST circuit, the MOS tube is not conducted.

6. The charge control circuit according to claim 4 or 5, further comprising N resistors, wherein the set of N resistors is divided in series with the third resistor, and wherein N is a positive integer greater than or equal to 1.

7. The charge control circuit of claim 4 or 5, wherein the first resistor has a resistance value equal to 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 of the first resistor is 50mΩ -100mΩ.

8. The charge control circuit according to claim 4 or 5, wherein a resistance value of the fourth resistor is 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 of the first resistor is 50mΩ -10Ω.

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

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

10. The terminal of claim 9, wherein the terminal wirelessly charges other devices when the processor inputs the third control voltage to the charge control circuit; and when the processor inputs the fourth control voltage to the charging control circuit, the terminal does not wirelessly charge other equipment.