CN115549230A - Charging control circuit and terminal - Google Patents

Abstract

A charging control circuit and terminal. In the case of reducing the production cost of the wireless control circuit, the terminal can turn off the wireless charging circuit IC ₂ when it is not charging other devices, so as not to cause battery leakage.

Description

A charging control circuit and terminal

technical field

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

Background technique

With the development of smart terminals, terminals such as tablets and mobile phones can be equipped with stylus pens. Wherein, the tablet can also be equipped with other devices such as a keyboard. Currently, the terminal can charge other devices such as a stylus or a keyboard through wireless charging.

In recent years, the technology of wirelessly charging other devices such as stylus pens or keyboards through the terminal has been favored by users. The terminal can realize the function of wirelessly charging other devices through the 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.

Contents of the invention

The present application provides a charging control circuit and a terminal. In the case of reducing the production cost of the wireless control circuit, the terminal can turn off the wireless charging circuit IC ₂ when not charging other devices, without causing battery leakage.

In the first aspect, the present application provides a charging control circuit, the charging control circuit includes a power supply and enabling control circuit, and a wireless charging circuit, and the power supply and enabling control circuit includes a boost BOOST circuit, wherein: the wireless charging The input terminal of the circuit is connected to the output terminal of the BOOST circuit; the BOOST circuit is used to transmit the electric energy in the battery to the input terminal of the wireless charging circuit; the enabling terminal of the wireless charging circuit is connected to the power supply and enabling control circuit; The power supply and enabling control circuit is used to input a first control voltage to the enabling terminal of the wireless charging circuit when the terminal is charging other devices, and the first control voltage is less than or equal to the enabling terminal of the wireless charging circuit. voltage; the power supply and enable control circuit is also used to input a second control voltage to the enable terminal of the wireless charging circuit when the terminal is not charging the other device, and the second control voltage is greater than the wireless charging The enable voltage of the circuit; when the enable end of the wireless charging circuit receives the first control voltage and the second control voltage, between the enable end of the wireless charging circuit and the power supply and enable control circuit are in the conduction state.

In the above embodiment, the wireless charging circuit is enabled for low voltage. When the control voltage received by the wireless charging circuit is the first control voltage, it indicates that it is a low voltage, which can make the wireless charging circuit enter the working state, so that the terminal can be Other devices are charged wirelessly. When the control voltage received by the wireless charging circuit is the second control voltage, it means that it is a high voltage, and the wireless charging circuit can be turned off, so that the terminal cannot wirelessly charge other devices, and will not receive the power transmitted by the battery. It will cause electric leakage.

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

In the above embodiment, the first resistor can be R ₃ in the exemplary charging control circuit provided in Figure 4 in the embodiment, and the MOS tube M ₁₁ in the original solution is replaced by the first resistor, and the cost of the first resistor is less than that of the MOS The cost of tube _M11 can save one MOS tube 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, wherein: the gate of the MOS transistor and the gate of the BOOST circuit The enable end is connected to the voltage input end; the first source of the MOS transistor is grounded; the drain of the MOS transistor is connected to the first end of the second resistor; the second end of the second resistor is connected to the first end of the third resistor One end is connected to the first end of the fourth resistor; the first end of the third resistor is connected to the first end of the fourth resistor; the second end of the third resistor is connected to the output end of the BOOST circuit; the The second terminal of the fourth resistor is connected with the enabling terminal of the wireless charging circuit.

In the above embodiment, the second resistor can be R ₂ in the exemplary charging control circuit provided in FIG. 4 in the embodiment, and the third resistor can be R in the exemplary charging control circuit provided in FIG. 4 in the embodiment. _1. The fourth resistor may be R ₄ in the exemplary charging control circuit provided in FIG. 4 in the embodiment. When the enabling voltage of the wireless charging circuit is less than or equal to 0.3V, when the resistance value _of the resistor R1 divided by the resistance value of the resistor R2 can range from ₂₀ to 45, then the resistor can be turned on when the MOS tube is turned on. R ₁ and resistor R ₂ divide the voltage in series so that the voltage at point A is less than or equal to the enabling voltage of the wireless charging circuit IC ₂ . When the MOS tube is not turned _on , resistor R1 and resistor R2 can divide the voltage in series so that the voltage at point _A is greater _than the enable voltage of the wireless charging circuit IC2.

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

In the above embodiment, the terminal can transmit the electric energy in the battery to other devices to wirelessly charge other devices through the wireless charging coil. When the terminal detects that other devices are wirelessly charging through the terminal, it can provide a first Three control voltages, 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 can be in the working state, and the wireless charging circuit is also in the working state, So that the terminal can charge other devices. When the terminal does not detect that there are other devices performing wireless charging through the terminal, it can provide a fourth control voltage to the voltage input terminal, the fourth control voltage is a low voltage, and then, the voltage input terminal transmits a The fourth control voltage enables the BOOST circuit to be in a non-working state, and the wireless charging circuit is turned off, so that the terminal can charge other devices without causing leakage.

In combination with the first aspect, in an 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; the voltage received at the gate of the MOS transistor is greater than or equal to the voltage of the BOOST circuit In the case of the enabling voltage, the MOS transistor is turned on; when the voltage received by the gate of the MOS transistor is lower than the enabling voltage of the BOOST circuit, the MOS transistor is not turned on.

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

In the above-mentioned embodiment, take N as 1 as an example for illustration. Referring to FIG. ₇ in the embodiment, the charging control circuit may further include a resistor R ₅ , which is set between point C and point A, and is connected to the resistor R ₁ is divided in series to adjust the voltage at point A.

With reference to the first aspect, in an implementation manner, the resistance of the first resistor is equal to or close to 0 ohm; when the resistance of the first resistor is close to 0 ohm, its resistance is 50mΩ-100mΩ.

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. At the same time, when the resistance value of the first resistor is 50mΩ-100mΩ, it will not cause the Power loss is too large. Wherein, the smaller the resistance value of the first resistor is, the smaller the loss of electric energy is. For example, close to 0, there is almost no loss.

With reference to the first aspect, in an implementation manner, the resistance of the fourth resistor is equal to or close to 0 ohm; when the resistance of the first resistor is close to 0 ohm, its resistance is 50mΩ-10Ω.

In the above embodiments, it is used to connect the enable terminal Vin of the wireless charging circuit with the power supply and enable control circuit. The fourth resistor can be replaced by other components, such as a wire used as a jumper similar to a resistor, and its function is the same as that of the fourth resistor.

In a second aspect, the present application provides a terminal, the terminal includes a processor and a charging control circuit, wherein: the processor is used to input a control voltage to the charging control circuit; the control voltage can be any one of the aforementioned first aspects The third control voltage or the fourth control voltage described in Item 1; the charging control circuit is the charging control circuit described in any one of the first aspects.

In the above embodiments, the processor may be connected to the voltage input terminal (such as the GPIO in FIG. 4 ) of the charging control circuit to provide it with a control voltage.

With reference to the second aspect, in an implementation manner, when the processor inputs the third control voltage to the charging control circuit, the terminal can perform wireless charging for other devices; when the processor inputs the third control voltage to the charging control circuit When the fourth control voltage is used, the terminal cannot wirelessly charge other devices.

In the above embodiment, when the terminal detects that other devices are wirelessly charged through the terminal, it can provide a third control voltage to the voltage input terminal, and the third control voltage is a high voltage, so that the terminal can wirelessly charge other devices. Charge. When the terminal does not detect that other devices are wirelessly charged through the terminal, it can provide a fourth control voltage to the voltage input terminal, the fourth control voltage is a low voltage, and the terminal cannot perform wireless charging for other devices.

Description of drawings

FIG. 1 is an exemplary scenario in which a terminal performs wireless charging for 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 charging control circuit involved in a solution;

Fig. 4 is a schematic diagram of the charging control circuit involved in the embodiment of the present application;

Fig. 5 is a voltage analysis diagram involved in the embodiment of the present application;

Fig. 6 is another voltage analysis diagram involved in the embodiment of the present application;

FIG. 7 is another schematic diagram of the charging control circuit involved in the embodiment of the present application;

FIG. 8 is a schematic structural diagram of a terminal provided by an embodiment of the present application.

detailed description

The terms used in the following embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. As used in the specification and appended claims of this application, the singular expressions "a", "an", "said", "above", "the" and "this" are intended to also Plural expressions are included unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used in this application refers to and includes any and all possible combinations of one or more of the listed items.

Hereinafter, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as implying or implying relative importance or implicitly specifying the quantity of indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the embodiments of the present application, unless otherwise specified, the "multiple" The meaning is two or more.

Embodiments of the present application provide a charging control circuit and a terminal, which can be applied to a process in which a terminal wirelessly charges other devices. Wherein, the terminal is a device that provides power, and may also be referred to as a transmitter device (ie, a TX device). For example, the terminal may be a device such as a tablet or a mobile phone. Other devices are devices that receive electric energy, and may also be referred to as receiving end devices (that is, RX devices). For example, the other device may be a device such as a stylus or a keyboard.

In the embodiment of the present application, the other device is a stylus as an example for description. It should be understood that this should not constitute a limitation to the embodiment of the present application.

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

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

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

As shown in FIG. 1 , a wireless charging coil 201 is disposed in the stylus 200 . The top 101 of the terminal 100 is provided with a wireless charging coil (not shown in the figure). The user can attach the stylus 200 to the top 101 of the terminal 100 . Furthermore, the wireless charging coil of the terminal 100 can perform energy interaction with the wireless charging coil of the stylus 200 , and transmit the electric energy of the terminal 100 to the stylus 200 , that is, charge the stylus 200 . When the terminal 100 is charging the stylus, a charging icon 102 may be displayed on the user interface of the terminal 100 . The charging icon 102 can 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 charging control circuit 111 and a wireless charging coil 112 . The stylus 200 may include a battery 210 , a charging control circuit 211 and a wireless charging coil 212 .

In some possible cases, the aforementioned wireless charging coil may also be referred to as a charging coil. Wherein, the wireless charging coil 112 may also be called a transmitting coil, and the wireless charging coil 212 may also be called a receiving coil.

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

Correspondingly, the stylus 200 can induce the alternating electromagnetic field emitted by the wireless charging coil 112 through the wireless charging coil 212 to generate an alternating electric signal, and input the alternating electric signal to the charging control circuit 211 . The charging control circuit 211 can rectify the AC signal into a DC signal, and input the DC signal to the battery 210 to charge the battery 210 to realize wireless charging.

In the embodiments of the present application, direct current signals and alternating electric signals are collectively referred to as electric signals, and may also be referred to as current or electric energy.

The battery involved in the following embodiments is referred to as the battery of the terminal unless otherwise specified, the charging control circuit is referred to as the charging control circuit of the terminal unless otherwise specified, and the wireless charging coil is referred to as the wireless charging coil of the terminal unless otherwise specified.

It can be known from the foregoing that, in order for the terminal to implement wireless charging for the stylus, the terminal needs to transmit the electrical signal in the battery to the wireless charging coil through the charging control circuit.

FIG. 3 is a schematic diagram of a charging control circuit involved in a scheme.

In a possible implementation, as shown in Figure 3, the charging control circuit may include a boost boost circuit IC ₁ , a wireless charging circuit IC ₂ , a resistor R ₁₁ , a resistor R ₁₂ , a resistor R ₁₃ , and a MOS tube M ₁₁ and MOS tube M ₁₂ . The output terminal V _out of the BOOST circuit IC ₁ is connected to the input terminal V _in of the wireless charging circuit IC ₂ through wiring. The working condition of the wireless charging circuit IC ₂ is low-level enable, that is, when the control voltage (V ₁₁ ) received by the enable terminal nEN of the wireless charging circuit IC ₂ is a low voltage, the wireless charging circuit IC ₂ can be made to work state. When the BOOST circuit IC ₁ is not working, the voltage of its output terminal V _out is approximately equal to the system voltage (3.5V-4.4V). The under voltage lockout (under voltage lockout, UVLO) voltage of the input terminal V _in of the wireless charging circuit IC ₂ is lower than the system voltage, which can be between 2.75V-2.95V.

It should be understood here that the control voltage of the enable terminal nEN of the wireless charging circuit IC ₂ is a low voltage by default, that is, the wireless charging circuit IC ₂ always satisfies the state of enabling at a low level. The implementation method is as follows: one end of the resistor R ₁₃ is connected to the enable terminal nEN of the wireless charging circuit IC ₂ , and the other end of the resistor R ₁₃ is connected to the first chip in the system-on-chip (SOC) of the terminal. The first chip can provide a low voltage for the enable terminal nEN of the wireless charging circuit IC ₂ so that it can be in a working state. Wherein, the first chip may be a processor (central processing unit, CPU) of the terminal.

_In the case that the MOS transistor M11 is not included in the circuit, since the voltage of the output terminal V _out of the BOOST circuit IC ₁ is always greater than the undervoltage lockout voltage of the input terminal V _in of the wireless charging circuit IC ₂ , and the wireless charging circuit IC ₂ If the control voltage of the enabling terminal nEN is low, the wireless charging circuit IC ₂ can be in a standby state. When the terminal is not charging other devices, when the wireless charging circuit IC ₂ is in the standby state, the battery will still transmit electrical signals to the wireless charging circuit IC ₂ through the BOOST circuit IC ₁ , resulting in power leakage. In this solution, in order to solve the leakage problem, the MOS transistor M ₁₁ is added so that the MOS transistor M ₁₁ is turned off when the terminal is not charging other devices. The specific implementation method is: the source of MOS transistor M11 (which can correspond to point S in Figure ₃ ) is connected to the output terminal V _out of BOOST circuit IC ₁ , and the drain of MOS transistor _M11 (which can correspond to point D in Figure 3 ) is connected to the input terminal V _in of the wireless charging circuit IC ₂ , and the gate of the MOS transistor M ₁₁ (which may correspond to point G in FIG. 3 ) is connected to the resistor R ₁₂ and one end of the resistor R ₁₂ . The voltage of the gate of the MOS transistor _M11 can be controlled through the resistor R11 and the resistor _R12 , so that the gate-source voltage of the MOS transistor _M11 does not meet its conduction condition, so that the MOS transistor _M11 is not turned _on . Wherein, the gate-source voltage is the difference between the voltage of the gate and the voltage of the source. Generally speaking, in this solution, the resistor R ₁₂ and the resistance value of the resistor R ₁₂ can be 10 kilo-ohms (KΩ) to meet the above description.

In this way, the output terminal V _out of the BOOST circuit IC ₁ can be disconnected from the input terminal V _in of the wireless charging circuit IC ₂ , and the battery cannot transmit electrical signals to the wireless charging circuit IC ₂ through the BOOST circuit IC ₁ , so that the wireless charging circuit IC ₂ can be turned off.

In the embodiment of the present application, other components are used in the charging control circuit to replace the aforementioned MOS transistor M ₁₁ . In the case of reducing the manufacturing cost of the wireless control circuit, the terminal can turn off the wireless charging circuit IC ₂ when it is not charging other devices, so as not to cause battery leakage.

FIG. 4 is a schematic diagram of the charging control circuit involved in the embodiment of the present application.

As shown in FIG. 4 , the charging control circuit may include a BOOST circuit IC ₁ , a wireless charging circuit IC ₂ , a resistor R ₁ , a resistor R ₂ , a resistor R ₃ , a resistor R ₄ and a MOS transistor M. Wherein, the resistor R ₃ is used to connect the output terminal V _out of the BOOST circuit IC ₁ and the input terminal V _in of the wireless charging circuit IC ₂ . One end of the resistor R4 (also referred to as the first end) is connected to the enable terminal _nEN of the wireless charging circuit IC ₂ , and the other end _of the resistor R4 ₍ also referred to as the second end) is connected to the resistor R1 and the resistor _One end of R2 is connected. The other end of the resistor R ₁ is connected to the output terminal V _out of the BOOST circuit IC ₁ . _The other end of the resistor R2 is connected to the drain of the MOS transistor M (which may correspond to point D in FIG. 4 ). The source of the MOS transistor M (which may correspond to point S in FIG. 4 ) is grounded, and the gate of the MOS transistor M (which may correspond to point G in FIG. 4 ) is used to input the control voltage V ₁ . The gate of the MOS transistor M and the enable terminal EN of the BOOST circuit IC ₁ are both connected to the voltage input terminal (corresponding to the GPIO in FIG. 4 ), and the voltage input terminal GPIO can be provided by the second chip in the SOC of the terminal. The second chip can input the control voltage V ₁ to the gate of the MOS transistor M and the enable terminal EN of the BOOST circuit IC ₁ through the voltage input terminal GPIO. Wherein, the second chip may be the same as or different from the aforementioned first chip. For example, the second chip can be a CPU.

Wherein, the BOOST circuit IC ₁ is enabled for high voltage, that is, when the control voltage V ₁ received by the enable terminal EN of the BOOST circuit IC1 is a high voltage, the wireless charging circuit IC ₂ can be in the working state. The wireless charging circuit IC ₂ is low-voltage enabled, that is, when the control voltage of the enable terminal nEN of the wireless charging circuit IC ₂ is a low voltage, the wireless charging circuit IC ₂ can be in a working state.

It should be understood that when the control voltage received by the enable terminal nEN of the wireless charging circuit IC ₂ is less than or equal to the first threshold voltage, the control voltage is a low voltage. When the control voltage received by the enable terminal nEN of the wireless charging circuit IC ₂ is greater than or equal to the second threshold voltage, the control voltage is a high voltage (not a low voltage). Wherein, the first threshold voltage is lower than the enabling voltage of the wireless charging circuit IC ₂ , and the second voltage threshold is greater than or equal to the enabling voltage of the wireless charging circuit IC ₂ . When the control voltage received by the enable terminal EN of the BOOST circuit IC ₁ is greater than or equal to the third threshold voltage, the control voltage is a high voltage. When the control voltage received by the enable terminal EN of the BOOST circuit IC ₁ is less than or equal to the 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 that of the BOOST circuit IC ₁ The enable voltage, the fourth voltage threshold is less than the enable voltage of the BOOST circuit IC ₁ . In a possible situation, the enabling voltage of the wireless charging circuit IC ₂ can be 1.8V, and the enabling voltage of the BOOST circuit IC ₁ can be 0.3V, which is lower than the voltage of the output terminal V _out of the BOOST circuit IC ₁ .

Compared with the charging control circuit involved in the previous solution, the charging control circuit provided in Figure 4 has the following two differences:

(1) Compared with the aforementioned charging control circuit shown in FIG. 3 , the charging control circuit involved in the embodiment of the present application does not include a MOS transistor M ₁₁ , but is connected to the output terminal of the BOOST circuit IC ₁ through a resistor R ₄ V _out and the input terminal V _in of the wireless charging circuit IC ₂ . In this way, the battery can input electric signals to the wireless charging circuit IC ₂ through the BOOST circuit IC ₁ .

(2) Compared with the aforementioned charging control circuit shown in FIG. 3 , in the charging control circuit involved in the embodiment of the present application, the first chip (such as a processor) is no longer used to send the wireless charging circuit to the enabling terminal of IC ₂ . nEN inputs a default low voltage as a control voltage (such as V ₁₁ in FIG. 3 ) to control the working state of the wireless charging circuit IC ₂ . In the embodiment of the present application, the enable terminal nEN of the wireless charging circuit IC ₂ is connected to the power supply and enable control circuit for receiving the control voltage V _B output by the power supply and enable control circuit. In this way, the control voltage of the enable terminal nEN of the wireless charging circuit IC ₂ can be adjusted through the power supply and enabling control circuit, so that the wireless charging circuit IC ₂ can be in a working state or a non-working state.

It should be understood that the cost of the resistor R1 is lower _than that _of the MOS transistor _M11 . Compared with FIG. ₃ and FIG. Wireless charging can be performed for other devices, but when the terminal is not charging other devices, the wireless charging circuit IC ₂ can be turned off to avoid battery leakage.

Wherein, the power supply and enabling control circuit includes a resistor R ₄ , a resistor R ₁ , a resistor R ₂ and a MOS transistor M. Wherein, the connection relationship of the resistor R ₄ , the resistor R ₁ , the resistor R ₂ and the MOS transistor M can refer to the foregoing description of the charging control circuit, and will not be repeated here. The power supply and enable control circuit is used to adjust the control voltage of the enable terminal nEN of the wireless charging circuit IC ₂ . Wherein, the control voltage of the enable terminal nEN of the wireless charging circuit IC ₂ corresponds to the voltage at point B in the figure.

_One end of the resistor R4 is connected to the enable terminal _nEN of the wireless charging circuit _IC2 , and the other end of the resistor R4 corresponds to point A. Record the voltage at point _A as VA, and record the voltage at point _B as V _B . It can be understood here that VA = V _B . Subsequent discussion of the voltage V _{A at the point A} will replace the voltage V _B at the point B. When the voltage at point A is low voltage, the voltage at point B is also low voltage, then the control voltage (V _B ) received by the enable terminal nEN of wireless charging circuit IC ₂ is low voltage, at this time, wireless charging The circuit IC ₂ can be in a working state or a standby state. When the voltage at point A is a high voltage, the voltage at point B is also a high voltage, and the control voltage (V _B ) received by the enable terminal nEN of the wireless charging circuit IC ₂ is a high voltage. At this time, wireless charging Circuit IC ₂ may be in an off state.

The wireless charging circuit IC ₂ mentioned above can be in the working state, which means that the terminal can wirelessly charge the stylus, and the conditions to be met include the following two conditions:

Condition 1: The input terminal Vin of the wireless charging circuit IC ₂ is connected to the output terminal Vout of the BOOST circuit IC ₁ , and can receive power from the battery output (that is, can receive battery power). And the voltage of the input terminal Vin of the wireless charging circuit IC ₂ is greater than or equal to the first working voltage, and the value of the first working voltage is greater than the voltage of the output terminal Vout of the BOOST circuit IC ₁ when the BOOST circuit IC ₁ is in the off state.

Condition 2: The control voltage received by the enable terminal nEN of the wireless charging circuit IC ₂ is a low voltage.

The wireless charging circuit IC ₂ mentioned above can be in the closed state, which means that the terminal can wirelessly charge the stylus, and the conditions to be met can be at least one of the following conditions 3 or 4:

Condition 3: the aforementioned condition 2 is not satisfied, that is, the control voltage received by the enable terminal nEN of the wireless charging circuit IC ₂ is a high voltage.

Condition 4: The input terminal Vin of the wireless charging circuit IC ₂ is not connected to the BOOST circuit IC ₁ .

The wireless charging circuit IC ₂ mentioned above can be in the standby state, which means that the terminal cannot wirelessly charge the stylus, but it will consume the power in the battery, which is the state to be avoided in the embodiment of the present application. For the description of the wireless charging circuit IC ₂ being in the standby state, reference may be made to the foregoing description of FIG. 3 , which will not be repeated here.

In the embodiment of this application, it is necessary to make the terminal not in the state of charging the stylus, so that the wireless charging circuit IC ₂ can be in the off state, so that the wireless charging circuit IC ₂ can not receive the electrical signal in the battery, and will not cause The battery is leaking.

It should be understood that, in the charging control circuit shown in FIG. 4 , regardless of whether the terminal is charging the stylus, the aforementioned condition 4 cannot always be satisfied because the wireless charging circuit IC ₂ The voltage of the output terminal V _out of the wireless charging circuit IC 2 is approximately equal to the system voltage (3.5V-4.4V), but the undervoltage lockout voltage of the input terminal V _in of the wireless charging circuit IC ₂ (can be between 2.75V-2.95V) is less than the system voltage . The output terminal V _out of the BOOST circuit IC ₁ is connected to the input terminal V _in of the wireless charging circuit IC ₂ through a resistor R ₃ . This means that there is a voltage difference between the output terminal V _out of the BOOST circuit IC ₁ and the input terminal V _in of the wireless charging circuit IC ₂ and is a path. In such a case, when the terminal is not in the state of charging the stylus, the wireless charging circuit IC ₂ can be turned off by making condition 3 true, without causing leakage.

It should be understood that the state where the terminal is charging the stylus includes but is not limited to the following scenarios:

Scenario 1: As shown in Figure 1 above, if the stylus is attached to the terminal, it means that the terminal is charging the stylus. One possible way is that the terminal charges the stylus through the wireless charging coil.

Scenario 2: The terminal can be provided with a storage device, which can be used to accommodate a stylus, and when the user places the stylus in the storage device, it means that the terminal is in a state of charging the stylus. One possible way is that the terminal charges the stylus through the wireless charging coil.

It should be understood that, in the charging control circuit shown in FIG. 4 , the state where the terminal is charging the stylus may be the state where the terminal is charging the stylus through the wireless charging coil.

The following describes the principle that the terminal can turn off the wireless charging circuit IC ₂ without causing battery leakage when the terminal is not charging other devices, and the terminal charges the stylus through the charging control circuit. The working principle is described.

For the principle that the wireless charging circuit IC ₂ can be turned off when the terminal is not charging other devices without causing battery leakage, please refer to the following description.

When the terminal is not in the state of charging the stylus, it is only necessary to make the aforementioned condition 3 (that is, the condition 2 not satisfied) be satisfied and the wireless charging circuit IC ₂ can be turned off immediately. Wherein, when the condition 3 is met, the control voltage received by the enable terminal nEN of the wireless charging circuit IC ₂ is not a low voltage (is a high voltage).

In the control circuit involved in FIG. 4 , the principle of making the control voltage received by the enable terminal nEN of the wireless charging circuit IC ₂ not be a low voltage can refer to the following description.

In a possible implementation manner, the MOS transistor M may be an NMOS transistor. The condition for the NMOS transistor to be turned on is: the MOS transistor M will be turned on when the gate-source voltage is greater than or equal to the conduction voltage. Wherein, the gate-source voltage is the difference between the voltage of the gate and the voltage of the source. Then the condition for the conduction of the MOS transistor M can be expressed as:

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

Wherein, in the formula (1), V _gs (M) represents the gate-source voltage of the MOS transistor M. Wherein, V _gs (M)=V _g (M)−V _s (M), V _g (M) represents the gate voltage of the MOS transistor M, and V _s (M) represents the source voltage of the MOS transistor M. V _th (M) represents the turn-on voltage of the MOS transistor M. The voltage value of the turn-on voltage can be set to be the same as the voltage value of the enable voltage of the BOOST circuit IC ₁ .

When the terminal is not charging other devices, the SOC of the terminal can input a low voltage (also referred to as the first voltage) to the voltage input terminal GPIO connected to the gate of the MOS transistor M, so that the gate of the MOS transistor M The pole voltage is the first voltage. The first voltage is less than or equal to the enable voltage of BOOST circuit IC ₁ , since the enable voltage of 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 _s (M)=0V. It can be seen that, if the gate-source voltage of the MOS transistor M is lower than the turn-on voltage, that is, V _gs (M)<V _th (M), the MOS transistor M is not turned on. Then the voltage V _A at point A at this time is equal to the voltage of the output terminal V _out of the BOOST circuit IC ₁ . In combination with the foregoing, it can be seen that the control voltage received by the enabling terminal nEN of the wireless charging circuit IC ₂ (ie, the voltage V _{B at point B} ) is equal to the voltage VA at point _A , then the control voltage received by the enabling terminal nEN of the wireless charging circuit IC ₂ It is equal to the voltage of the output terminal V _out of the BOOST circuit IC ₁ . In this way, the control voltage received by the enable terminal nEN of the wireless charging circuit IC ₂ is greater than or equal to the second threshold voltage (that is, the control voltage is a high voltage, and condition 2 is not established), so that the wireless charging circuit IC ₂ can be in the off state, and will not cause leakage.

In a possible implementation manner, the SOC of the terminal can input a first voltage to the voltage input terminal GPIO connected to the gate of the MOS transistor M, including: the gate of the MOS transistor M is connected to the voltage input terminal GPIO, the The voltage input terminal GPIO can be provided by the second chip in the SOC of the terminal. When the terminal is not in the state of wirelessly charging the stylus, the second chip can input the first voltage to the gate of the MOS transistor M through the voltage input terminal GPIO.

Wherein, the analysis process of the voltage V _B at point B being equal to the voltage of the output terminal V _out of the BOOST circuit IC ₁ can refer to the following description.

As shown in Figure 5, the output terminal V _out of the BOOST circuit IC ₁ corresponds to point C in Figure 5, the ground point connected to the drain of the MOS transistor M corresponds to point D in Figure 5, and the charging control shown in Figure 4 Point A and point B in the circuit correspond to point A and point B in FIG. 5 , respectively.

When the MOS transistor M is not turned on, the circuit from point C passing through point A to point D is in an open circuit state, and the circuit passing through point A to point B at point C is in a conducting state, then the voltage at point A passes through point C The circuit from point A to point B is determined. Since there is no voltage difference between point C and point B, the resistors R ₁ and R ₄ will not divide the voltage, then V _B is equal to VA and the voltage V _C at point _C , and V _C is the BOOST circuit IC ₁ The voltage at the output terminal V _out , which can be denoted as Vout'.

For the working principle of charging the stylus by the terminal through the charging control circuit, reference may be made to the following description.

When the terminal is in the state of charging the stylus, the stylus can be charged only when the aforementioned conditions 1 and 2 are satisfied.

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

When the BOOST circuit IC ₁ is in the working state, the condition 1 can be established. Wherein, the BOOST circuit IC ₁ is in the working state, which means that the enabling terminal EN of the BOOST circuit IC ₁ can reach a high voltage (also referred to as the second voltage ), so that the voltage of the output terminal Vout of the BOOST circuit IC ₁ can be raised from the system voltage (3.5V-4.4V) to a second working voltage, which is greater than the first working voltage of the input terminal Vin of the wireless charging circuit IC ₂ voltage, when the resistance value of the resistor R3 is 0Ω or close to 0Ω, such as 50mΩ-100mΩ, the voltage at the input terminal Vin of the wireless charging circuit IC ₂ can be approximately equal to the second operating voltage (greater than the first operating voltage), so that condition 1 holds. Among them, the resistance value of the resistor _R3 is 0Ω or close to 0Ω, and its function is to connect the input terminal Vin of the wireless charging circuit and the output terminal Vout of the BOOST circuit. In this way, the terminal can be in the state of wireless charging for the stylus, and the voltage of the input terminal Vin of the wireless charging circuit IC ₂ is closer to the second working voltage of the BOOST circuit IC ₁ , so that the voltage of the input terminal Vin of the wireless charging circuit IC ₂ can be reached. The first working voltage makes the wireless charging circuit IC ₂ enter the working state, and transmits the received electric signal of the battery to the wireless charging coil.

Wherein, when condition 2 is met, the control voltage received by the enable terminal nEN of the wireless charging circuit IC ₂ is a low voltage. The description of making condition 2 hold can refer to the following description.

In the charging control circuit involved in FIG. 4 , the principle of making the control voltage received by the enable terminal nEN of the wireless charging circuit IC ₂ a low voltage can be referred to the following description.

The MOS transistor M in the charging control circuit shown in FIG. 4 is the aforementioned NMOS transistor. The introduction about the NMOS transistor is the same as the foregoing description, and reference may be made to the foregoing description, which will not be repeated here.

In a possible implementation, a Hall sensor can be set in the terminal, and in response to the operation of attaching the stylus to the terminal, the Hall sensor can send the voltage input terminal GPIO connected to the gate of the MOS transistor M through the SOC. A high voltage (also referred to as a second voltage) is input so that the gate voltage of the MOS transistor M is the second voltage. The second voltage is greater than or equal to the enabling voltage of the BOOST circuit IC ₁ , since the enabling voltage of the BOOST circuit IC ₁ is equal to the conduction voltage of the 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 _s (M)=0V. It can be seen from this that the gate-source voltage of the MOS transistor M is greater than the turn-on voltage, that is, V _gs (M)>V _th (M), then the MOS transistor M is turned on. Then the voltage V _A at point A at this time may be less than or equal to the enable voltage of the enable terminal nEN of the wireless charging circuit IC ₂ . In combination with the foregoing, it can be seen that the control voltage received by the enabling terminal nEN of the wireless charging circuit IC ₂ (ie, the voltage V _{B at point B} ) is equal to the voltage VA at point _A , then the control voltage received by the enabling terminal nEN of the wireless charging circuit IC ₂ Less than or equal to the enabling voltage of the wireless charging circuit IC ₂ . In this way, the control voltage received by the enable terminal nEN of the wireless charging circuit IC ₂ is less than or equal to the first threshold voltage (that is, the control voltage is a low voltage, and condition 2 is satisfied), so that the wireless charging circuit IC ₂ can be in the working state, then the condition 1 and condition 2 are both satisfied, the terminal can charge the stylus.

In a possible implementation, the SOC of the terminal can input a second voltage to the voltage input terminal GPIO connected to the gate of the MOS transistor M, including: the gate of the MOS transistor M is connected to the voltage input terminal GPIO, the The voltage input terminal GPIO can be provided by the second chip in the SOC of the terminal. When the terminal is in the state of wirelessly charging the stylus, the second chip can input a second voltage to the gate of the MOS transistor M through the voltage input terminal GPIO.

Wherein, the analysis process that the voltage V _B at point B is less than or equal to the enable voltage of the wireless charging circuit IC ₂ can refer to the following description.

As shown in Figure 6, the output terminal V _out of the BOOST circuit IC ₁ corresponds to point C in Figure 6, the ground point connected to the drain of the MOS transistor M corresponds to point D in Figure 6, and the charging control shown in Figure 4 Point A and point B in the circuit correspond to point A and point B in FIG. 6 , respectively.

When the MOS tube M is turned on, the circuit from point C passing through point A to point B is in a conducting state but there is no voltage difference, but the circuit from point C passing through point A to point D is in a conducting state and there is a voltage difference. Then the voltage at point A is determined by the circuit from point C through point A to point D. The voltage V _C at point C is the voltage of the output terminal V _out of the BOOST circuit IC ₁ , and this voltage can be denoted as Vout′, that is, V _C =V _out . Point D is grounded, and the voltage at point D is V _D =0V. In the circuit from point C through point _A to point D, there is resistor R1 and resistor R2 in series to divide the voltage, then the voltage at point A can refer to the following formula ( ₂ ).

In the above formula ( ₂ ), Vout' represents the voltage _of the output terminal V _out of the BOOST circuit IC1, _R'1 represents the resistance value _of the resistor R1, and _R'2 represents the resistance value of the resistor R2.

Referring to the formula ( ₂ ), it can be seen that the voltage at point B can be adjusted by configuring the resistance value _of the resistor R1 and the resistance value of the resistor R2 so that it is less _than or equal to the enabling voltage of the wireless charging circuit IC2, for example, R ' ₁ =150KΩ, R' ₂ =4.7KΩ. The resistance value of the resistor R ₁ and the resistance value of the resistor R ₂ can also have other configuration values, for example, R′ ₁ =160KΩ, R′ ₂ =5KΩ, and for example, when the enabling voltage of the wireless charging circuit is less than or When it is equal to 0.3V, the resistance value _of the resistor R1 divided by the resistance value of the resistor R2 may range from ₂₀ to 45. It can be achieved that the resistor R1 and the resistor R2 can divide the voltage in series so that the voltage at point _A is less _than or equal to the enable voltage of the wireless charging circuit _IC2 . _The embodiment of the present application does not limit the resistance value _of the resistor R1 and the resistance value _of the resistor R2, as long as the resistor R1 and the resistor R2 can divide the voltage in series so that the voltage at point _A is less than Or equal to the enabling voltage of the wireless charging circuit IC ₂ .

In a possible implementation, the enabling voltage of the wireless charging circuit IC ₂ can be set to 0.5V, and in the case of R' ₁ =150KΩ, R' ₂ =4.7KΩ, the voltage at point A can be 0.15V, Since the voltage at point B is equal to the voltage at point A, the control voltage (0.15V) received by the wireless charging circuit IC ₂ is less than the enabling voltage (0.5V) of the wireless charging circuit IC ₂ , and the wireless charging circuit IC ₂ is in operation state, it can receive the electrical signal transmitted by the battery to charge the stylus.

It should be understood that the enabling voltage of the wireless charging circuit IC ₂ can be set to 0.5V as an example, which should not be construed as limiting the embodiment of the present application, and can also be set to other values, such as 0.4V, etc. This is not limited.

It should be understood that the aforementioned Hall sensor is only an example for detecting whether the terminal is in the state of charging the stylus. In other cases, the Hall sensor can also be replaced by other components, such as a pressure sensor. When the stylus is attached to the terminal, the pressure sensor can detect the change of gravity, 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. It may also be other components, which are not limited in this embodiment of the present application.

It should be understood that the charging control circuit shown in FIG. 4 is just an example, and there may be other examples, and one or more components may be replaced by other components that can achieve the same purpose. Multiple components in the charging control circuit can also be combined. Other examples of the charging control circuit can refer to the following description:

Other Example 1: The MOS transistor M in the charging 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, whose function is consistent with that of the MOS tube M, and is used to control whether the resistor R ₂ is connected to point D. Wherein, it can be set that when the control voltage received by the SPDT switch is greater than or equal to the enabling voltage of BOOST circuit IC ₁ , the resistor R ₂ is connected to point D, and the control voltage received by the SPDT switch is lower than that of BOOST circuit IC ₁ When the enabling voltage is enabled, the resistor _R2 is not connected to point D.

Other example 2: As shown in Figure 4 above, between point C and point A, in addition to the resistor R ₁ , other N resistors can be included, and the N resistors can be divided in series with the resistor R ₁ to adjust the voltage of A point voltage. Wherein, N is a positive integer greater than or equal to 1. Taking N as ₁ as an example for illustration, referring to Figure ₇ , the charging control circuit may also include a resistor R5, which is set between point C and point _A , and is connected in series with resistor R1 to divide the voltage to adjust the voltage of point A. Voltage. In a possible implementation, if in the charging control circuit shown in FIG. ₄ , the resistance value of resistor R1 is M, then in the charging control circuit shown in FIG. ₅ , the resistance value of R1 is Adding that the resistance value of R ₂ is equal to M, the charging control circuit shown in FIG. 5 can have the same function as the charging control circuit shown in FIG. 4 .

Other example 3: the resistor R ₃ involved in the aforementioned Figure 4 can be other components, such as a wire used as a jumper similar to a resistor, etc., which has the same function as the resistor R ₃ and is used to connect to the input terminal Vin of the wireless charging circuit At the same time as the output terminal Vout of the BOOST circuit, the electrical signal loss will not be too large due to the resistance value being too large. 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 wiring without connecting other components in between.

Other example 4: the resistance value of the resistor R ₄ involved in the foregoing FIG. 4 is 0Ω or close to 0Ω, for example, 50mΩ-10Ω, and its resistance value may be greater than that of the resistor R ₃ . _The resistor R4 is used to connect the enable terminal Vin of the wireless charging circuit with the power supply and enable control circuit. R ₄ can be replaced by other components, such as wires used as jumpers similar to resistors, and its function is the same as that of resistor R ₄ .

In the embodiment of the present application, the BOOST circuit IC ₁ can also be called a BOOST circuit. Similarly, other Chinese terms including English can also be replaced by only the preceding Chinese. For example, the wireless charging circuit IC ₂ may also be called a wireless charging circuit, and the voltage input terminal GPIO may also be called a voltage input terminal. _The resistor R1 can also be called the third resistor, the resistor R2 can also be called the _second resistor, the resistor _R3 can also be called the first resistor, and the resistor R4 can also be called the _fourth resistor. One end of any resistor may be referred to as a first end of the resistor, and the end different from the first end may be referred to as a second end. For example, one end of the second resistor (R ₂ ) may be referred to as a first end, and the other end of the second resistor may be referred to as a 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 is the fourth control voltage.

In addition to charging the stylus, the terminal can use the charging control circuit involved in the embodiment of the present application, and can use the charging control circuit involved in the embodiment of the present application when charging other devices. The embodiment of the present application only uses the stylus as the Examples are used for illustration and should not be construed as limiting the embodiments of the present application. For example, the other device may be a keyboard.

An exemplary terminal provided by the embodiment of the present application is introduced below.

FIG. 8 is a schematic structural diagram of a terminal provided by an embodiment of the present application.

The following uses a terminal as an example to describe the embodiment in detail. It should be understood that a terminal may have more or fewer components than shown in the figures, 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: a processor 110, an external memory interface 120, an internal memory 121, a universal serial bus (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, Wireless communication module 160, audio module 170, speaker 170A, receiver 170B, microphone 170C, earphone jack 170D, sensor module 180, button 190, motor 191, indicator 192, camera 193, display screen 194 and subscriber identification module (subscriber identification module , SIM) card interface 195 etc.

It can be understood that, the structure shown in the embodiment of the present application does not constitute a specific limitation on the terminal. In some other embodiments of the present application, the terminal may include more or fewer components than shown in the figure, or combine certain components, or separate certain components, or arrange different components. The illustrated components can be realized in hardware, software or a combination of software and hardware.

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

Wherein, the controller may be the nerve center and command center of the terminal. The controller can generate an operation control signal according to the instruction opcode and timing signal, and complete the control of fetching and executing the instruction.

A memory may also be provided in the processor 110 for storing instructions and data. In some embodiments, the memory in 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 use the instruction or data again, it can be called directly from the memory. Repeated access is avoided, and the waiting time of the processor 110 is reduced, thereby improving the efficiency of the system.

In some embodiments, processor 110 may include one or more interfaces. The interface may include an integrated circuit (inter-integrated circuit, I2C) interface, an integrated circuit built-in audio (inter-integrated circuitsound, 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, etc.

It can be understood that the interface connection relationship between the modules shown in the embodiment of the present application is only a schematic illustration, and does not constitute a structural limitation of the terminal. In other embodiments of the present application, the terminal may also adopt different interface connection modes in the above embodiments, or a combination of multiple interface connection modes.

The charging management module 140 is configured to receive a charging input from a charger. Wherein, the charger may be a wireless charger or a wired charger.

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

Wherein, the charging control circuit 140A can be connected with the battery 142 and the wireless charging coil 140B for wireless charging for 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 and the baseband processor.

Antenna 1 and Antenna 2 are used to transmit and receive electromagnetic wave signals. Each antenna in the terminal can be used to cover single or multiple communication frequency bands. Different antennas can also be multiplexed to improve the utilization of the antennas.

The mobile communication module 150 can provide wireless communication solutions including 2G/3G/4G/5G 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) and the like.

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

The wireless communication module 160 can provide applications on the terminal including wireless local area networks (wireless local area networks, WLAN) (such as wireless fidelity (wireless fidelity, Wi-Fi) network), bluetooth (bluetooth, BT) and so on.

In some embodiments, the antenna 1 of the terminal 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 technology. The wireless communication technology may include global system for mobile communications (global system for mobile communications, GSM), general packet radio service (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. The GPU is a microprocessor for image processing, and is connected to the display screen 194 and the application processor. GPUs are 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 screen 194 includes a display panel.

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

The ISP is used for processing the data fed back by the camera 193 .

Camera 193 is used to capture still images or video. The object generates an optical image through the lens and projects it to the photosensitive element. The photosensitive element may be a charge coupled device (charge coupled device, CCD) or a complementary metal-oxide-semiconductor (complementary metal-oxide-semiconductor, CMOS) phototransistor.

Digital signal processors are used to process digital signals. In addition to digital image signals, they can also process other digital signals. For example, when the terminal selects a frequency point, the digital signal processor is used to perform Fourier transform on the energy of the frequency point.

Video codecs are used to compress or decompress digital video. An endpoint can support one or more video codecs. In this way, the terminal can play or record videos in various encoding formats, for example: moving picture experts group (moving picture experts group, MPEG) 1, MPEG2, MPEG3, MPEG4, and so on.

The NPU is a neural-network (NN) computing processor. By referring to the structure of biological neural networks, such as the transfer mode between neurons in the human brain, it can quickly process input information and continuously learn by itself.

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

Random access memory may include static random-access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (synchronous dynamic random access memory, SDRAM), double data rate synchronous Dynamic random access memory (double data rate synchronous dynamic random access memory, DDR SDRAM, such as the fifth generation DDR SDRAM is generally called DDR5 SDRAM), etc.;

Non-volatile memory may include magnetic disk storage devices, flash memory (flash memory).

According to the operating principle, flash memory can include NOR FLASH, NAND FLASH, 3D NAND FLASH, etc. According to the potential order of storage cells, it can include single-level storage cells (single-level cell, SLC), multi-level storage cells (multi-level cell, MLC), etc., which may include universal flash storage (English: universal flash storage, UFS), embedded multimedia memory card (embedded multi media Card, eMMC) etc. according to storage specifications.

The random access memory can be directly read and written by the processor 110, and can be used to store executable programs (such as machine instructions) of an operating system or other running programs, and can also be used to store data of users and application programs.

The non-volatile memory can also store executable programs and data of users and application programs, etc., and can 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 non-volatile memory, so as to expand the storage capacity of the terminal.

The terminal can implement audio functions 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 playback, recording, etc.

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

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 listen to hands-free calls.

Receiver 170B, also called "earpiece", is used to convert audio electrical signals into sound signals. When the terminal answers a phone call or a voice message, the receiver 170B can be placed close to the human ear to listen to the voice.

The microphone 170C, also called "microphone" or "microphone", is used to convert sound signals into electrical signals.

The earphone interface 170D is used for connecting wired earphones.

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

Among them, the pressure sensor can be used to sense the pressure signal, and can convert the pressure signal into an electrical signal.

Magnetic sensors include Hall sensors. The magnetic sensor can be used to input a high voltage (also 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 attaching the stylus to the terminal.

The fingerprint sensor is used to collect fingerprints. The terminal can use the collected fingerprint features to unlock fingerprints, access application locks, take pictures with fingerprints, answer incoming calls with fingerprints, etc.

Touch sensor, also known as "touch panel". The touch sensor 180K can be disposed on the display screen 194, and the touch sensor 180K and the display screen 194 form a touch screen, also called a “touch screen”.

The keys 190 include a power key, a volume key and the like. The key 190 may be a mechanical key. It can also be a touch button. The terminal can receive key input and generate key signal input related to user settings and function control of the terminal.

The motor 191 can generate a vibrating reminder.

The indicator 192 can be an indicator light, and can be used to indicate charging status, power change, and can also be used to indicate messages, missed calls, notifications, and the like.

The SIM card interface 195 is used for connecting a SIM card.

In some embodiments, the charging control circuit mentioned above can be coupled with the processor, and can be used to input the control voltage to the voltage input terminal GPIO of the charging control circuit. In a possible implementation, when the terminal is charging other devices, the control voltage may be the aforementioned third threshold voltage (high voltage), so that the terminal can wirelessly charge other devices. When the terminal is not charging other devices, the control voltage may be the aforementioned fourth threshold voltage (low voltage), so that the terminal cannot wirelessly charge other devices.

It should be understood that the charging control circuit provided in the embodiment of the present application can be installed in other charging devices in addition to being installed in the terminal, so as to realize wireless charging without causing leakage of the wireless charging circuit. .

As mentioned above, the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still understand the foregoing The technical solutions described in each embodiment are modified, or some of the technical features are replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the various embodiments of the application.

As used in the above embodiments, depending on the context, the term "when" may be interpreted to mean "if" or "after" or "in response to determining..." or "in response to detecting...". Similarly, depending on the context, the phrases "in determining" or "if detected (a stated condition or event)" may be interpreted to mean "if determining..." or "in response to determining..." or "on detecting (a stated condition or event)" or "in response to detecting (a stated condition or event)".

In the above embodiments, all or part of them may be implemented by software, hardware, firmware or any combination thereof. When implemented using software, it 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 the computer program instructions are loaded and executed on the computer, the processes or functions according to the embodiments of the present application will be generated in whole or in part. The computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable devices. The computer instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from a website, computer, server or data center Transmission to another website site, computer, server, or data center by wired (eg, coaxial cable, optical fiber, DSL) or wireless (eg, infrared, wireless, microwave, etc.) means. 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 or a data center integrated with one or more available media. The available media may be magnetic media (eg, floppy disk, hard disk, magnetic tape), optical media (eg, DVD), or semiconductor media (eg, solid state hard disk), etc.

Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments are realized. The processes can be completed by computer programs to instruct related hardware. The programs can be stored in computer-readable storage media. When the programs are executed , may include the processes of the foregoing method embodiments. The aforementioned storage medium includes: ROM or random access memory RAM, magnetic disk or optical disk, and other various media that can store program codes.

Claims (10)

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.

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