CN111884303A - Charging control circuit, charging control method and electronic device - Google Patents

Abstract

The invention provides a charging control circuit, a charging control method and electronic equipment, and relates to the field of charging. The circuit includes a microprocessor, a voltage detection circuit, a battery, an adapter interface, a charging management chip and a power supply circuit. The charging management chip includes a charging module and a switch module. The microprocessor is electrically connected to the voltage detection circuit, the switch module and the power supply circuit. The input end of the module is electrically connected with the adapter interface, the output end of the charging module is electrically connected with the load and the power supply circuit, and the switch module is electrically connected with the output end of the charging module and the battery. The charging module outputs the power supply voltage according to the input power provided by the adapter interface to supply power to the load, the microprocessor and charge the battery. The voltage detection module detects the voltage value of the battery in real time, and the microprocessor detects the voltage value when the voltage value reaches the preset charging completion threshold. , the control switch module is disconnected. When the user forgets to unplug the adapter for a long time, the battery will not be charged and discharged frequently, thus prolonging the battery life.

Description

Charging control circuit, charging control method and electronic device

technical field

The present invention relates to the field of charging, in particular, to a charging control circuit, a charging control method and an electronic device.

Background technique

At present, the charging solutions for electronic products are usually divided into two types: those that support path management and those that do not support path management.

For the charging scheme that does not support path management, the system power supply terminal VSYS and the battery terminal are the same node. The charging IC (Integrated Circuit) provides power to the load while charging the battery. When the battery is fully charged, the charging IC internally cuts off the charging. Link, the load can not continue to obtain current from the adapter input, the load is powered by the battery, which accelerates the consumption of battery power. When the battery voltage drops to the threshold Vrecharge set inside the charging IC, the charging link is opened again to continue charging the battery. For the charging solution that supports path management, although the system power supply terminal VSYS and the battery terminals are distributed independently, after the battery is fully charged, the charging IC stops charging the battery. At this time, the load is supported by the system power supply terminal VSYS and the battery. When the current is large and exceeds the maximum capacity provided by the adapter, the battery supplies power to the load in reverse, which accelerates the consumption of battery power. At the same time, some circuits inside the charging IC will also consume battery power. When the threshold Vrecharge is reached, the charging link is turned on again to continue charging the battery.

In the above two charging schemes, when the user forgets to pull out the adapter for a long time, the battery will be charged and discharged frequently, thus causing irreversible impact on the battery life.

SUMMARY OF THE INVENTION

In view of this, the purpose of the present invention is to provide a charging control circuit, a charging control method and an electronic device, so as to solve the problem that when a user forgets to pull out the adapter for a long time in the prior art, the battery will be frequently charged and discharged, thereby shortening the battery life. lifespan issue.

In order to achieve the above purpose, the technical solutions adopted in the embodiments of the present invention are as follows:

In a first aspect, an embodiment of the present invention provides a charging control circuit, including a microprocessor, a voltage detection circuit, a battery, an adapter interface, a charging management chip, and a power supply circuit, where the charging management chip includes a charging module and a switch module, and the The microprocessor is electrically connected to the voltage detection circuit, the switch module and the power supply circuit, the input end of the charging module is electrically connected to the adapter interface, the output end of the charging module is electrically connected to the load, the The power supply circuits are all electrically connected, and the switch module is also electrically connected to the output end of the charging module and the battery;

The adapter interface is used to provide input power for the charging module when an adapter is inserted;

The charging module is used for outputting a power supply voltage according to the input power supply; the power supply voltage is used for supplying power to the load, and is output to the battery through the switch module to charge the battery and output to the microprocessor through the power supply circuit power supply;

The voltage detection circuit is used to detect the voltage value of the battery in real time, and output the voltage value of the battery to the microprocessor;

The microprocessor is configured to control the switch module to turn off when the voltage value of the battery reaches a preset charging completion threshold, so that the charging management chip is in a power saving mode.

In an optional implementation manner, the microprocessor is further configured to control the switch if the voltage value of the battery drops to an overdischarge voltage of the battery when the charge management chip is in a power saving mode The module is closed so that the supply voltage continues to charge the battery through the switch module output.

In an optional embodiment, the charging control circuit further includes a button module, the charging management chip further includes a button detection module, the button module is electrically connected to the button detection module, and the button detection module is connected to the button detection module. The switch module is electrically connected;

The button module is configured to output a button signal to the button detection module according to a user's pressing operation;

The key detection module is configured to control the switch module to close according to the key signal, so that the charging management chip exits the power saving mode.

In an optional implementation manner, the key detection module is configured to distinguish between the user's menu operation and the charging management chip exiting the power saving mode according to the duration of the key signal, and when the duration of the key signal reaches a set value When the time is long, the switch module is controlled to be closed, so that the charging management chip exits the power saving mode.

In an optional embodiment, the switch module includes a bidirectional controlled MOS transistor.

In a second aspect, an embodiment of the present invention provides a charging control method, which is applied to a charging control circuit, where the charging control circuit includes a microprocessor, a voltage detection circuit, a battery, an adapter interface, a charging management chip, and a power supply circuit. The management chip includes a charging module and a switch module, the microprocessor is electrically connected to the voltage detection circuit, the switch module and the power supply circuit, and the input end of the charging module is electrically connected to the adapter interface, so The output end of the charging module is electrically connected to the load and the power supply circuit, and the switch module is also electrically connected to the output end of the charging module and the battery; the method includes:

The adapter interface provides input power for the charging module when an adapter is inserted;

The charging module outputs a power supply voltage according to the input power supply; the power supply voltage is used to supply power to the load, output to charge the battery through the switch module, and output power to the microprocessor through the power supply circuit ;

The voltage detection circuit detects the voltage value of the battery in real time, and outputs the voltage value of the battery to the microprocessor;

When the voltage value of the battery reaches a preset charging completion threshold, the microprocessor controls the switch module to turn off, so that the charging management chip is in a power saving mode.

In an optional embodiment, the method further includes:

When the charge management chip is in the power saving mode, the microprocessor controls the switch module to close if the voltage value of the battery decreases to the over-discharge voltage of the battery, so that the power supply voltage continues to pass through. The switch module output charges the battery.

In an optional embodiment, the charging control circuit further includes a button module, the charging management chip further includes a button detection module, the button module is electrically connected to the button detection module, and the button detection module is connected to the button detection module. The switch module is electrically connected; the method further includes:

The button module outputs a button signal to the button detection module according to the user's pressing operation;

The key detection module controls the switch module to close according to the key signal, so that the charging management chip exits the power saving mode.

In an optional implementation manner, the button detection module controls the switch module to close according to the button signal, so that the charging management chip exits the power saving mode, including:

The button detection module distinguishes between the user's menu operation and the charging management chip exiting the power saving mode according to the duration of the button signal, and controls the switch module to close when the duration of the button signal reaches the set duration, Thus, the charging management chip exits the power saving mode.

In a third aspect, an embodiment of the present invention provides an electronic device, including a load and the charging control circuit according to any one of the foregoing embodiments.

The charging control circuit, charging control method, and electronic device provided by the embodiments of the present invention include a microprocessor, a voltage detection circuit, a battery, an adapter interface, a charging management chip, and a power supply circuit, and the charging management chip includes a charging module and a switch. The module, the microprocessor is electrically connected with the voltage detection circuit, the switch module and the power supply circuit, the input end of the charging module is electrically connected with the adapter interface, the output end of the charging module is electrically connected with the load and the power supply circuit, and the switch module is also electrically connected with the charging module The output terminal and the battery are all electrically connected. The adapter interface provides input power for the charging module when an adapter is inserted, and the charging module outputs a power supply voltage according to the input power supply. The power supply voltage is used to supply power to the load, output to the battery through the switch module, and output to the microprocessor through the power supply circuit The voltage detection module detects the voltage value of the battery in real time, and outputs the voltage value of the battery to the microprocessor. When the voltage value of the battery reaches the preset charging completion threshold, the microprocessor controls the switch module to turn off, so that the The charge management chip is in power saving mode. In this way, after it is detected that the charging of the battery is completed, the switch module is controlled to be disconnected, so that the path between the battery and the output end of the charging module is cut off, so that the power supply voltage output by the charging module cannot charge the battery, and the battery cannot pass through. The switch module reverses power supply to the load, which effectively reduces the power consumption speed of the battery. When the user forgets to unplug the adapter for a long time, the battery power is effectively preserved, and the battery will not be charged and discharged frequently, thereby prolonging the battery life.

In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below, and are described in detail as follows in conjunction with the accompanying drawings.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore do not It should be regarded as a limitation of the scope, and for those of ordinary skill in the art, other related drawings can also be obtained according to these drawings without any creative effort.

1 shows a structural block diagram of an electronic device provided by an embodiment of the present invention;

FIG. 2 shows another structural block diagram of an electronic device provided by an embodiment of the present invention;

FIG. 3 shows a schematic diagram of a circuit structure of a charging chip;

Figure 4 shows a schematic diagram of a BATFET MOS tube parameter table;

FIG. 5 shows a schematic flowchart of a charging control method provided by an embodiment of the present invention;

FIG. 6 shows another schematic flowchart of a charging control method provided by an embodiment of the present invention;

FIG. 7 shows another schematic flowchart of a charging control method provided by an embodiment of the present invention.

Icon: 10-electronic equipment; 100-charging control circuit; 200-load; 110-microprocessor; 120-voltage detection circuit; 130-battery; 140-adapter interface; 150-charging management chip; 160-power supply circuit; 170 -Key module; 151-Charging module; 152-Switch module; 153-Key detection module.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only These are some embodiments of the present invention, but not all embodiments. The components of the embodiments of the invention generally described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations.

Thus, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present invention.

It should be noted that relational terms such as the terms "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any relationship between these entities or operations. any such actual relationship or sequence exists. Moreover, the terms "comprising", "comprising" or any other variation thereof are intended to encompass a non-exclusive inclusion such that a process, method, article or device that includes a list of elements includes not only those elements, but also includes not explicitly listed or other elements inherent to such a process, method, article or apparatus. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in a process, method, article or apparatus that includes the element.

Please refer to FIG. 1 , which is a structural block diagram of an electronic device 10 according to an embodiment of the present invention. The electronic device 10 may be a wearable device such as a wristband, a watch, or a smart phone, a tablet computer, a Personal Computer (PC), a Mobile Internet Device (MID), a Personal Digital Assistant (Personal Digital Assistant, PDA) and other electronic products.

As shown in FIG. 1 , the electronic device 10 includes a charging control circuit 100 and a load 200 , and the charging control circuit 100 can supply power to the load 200 . The charging control circuit 100 includes a microprocessor 110, a voltage detection circuit 120, a battery 130, an adapter interface 140, a charging management chip 150, and a power supply circuit 160. The charging management chip 150 includes a charging module 151 and a switch module 152. The microprocessor 110 and The voltage detection circuit 120 , the switch module 152 and the power supply circuit 160 are all electrically connected, the input end of the charging module 151 is electrically connected to the adapter interface 140 , the output end of the charging module 151 is electrically connected to the load 200 and the power supply circuit 160 , and the switch module 152 is also electrically connected to the adapter interface 140 . The output end of the charging module 151 and the battery 130 are both electrically connected.

The adapter interface 140 is used to provide input power for the charging module 151 when an adapter is inserted.

In this embodiment, when the electronic device 10 needs to be charged, an adapter can be connected to the adapter interface 140 , and the adapter is inserted into the adapter interface 140 to provide input power for the charging module 151 .

The charging module 151 is used for outputting a supply voltage according to the input power supply; the supply voltage is used for supplying power to the load 200 , charging the battery 130 through the switch module 152 , and supplying power to the microprocessor 110 through the power supply circuit 160 .

In this embodiment, the charging module 151 is used to rectify the input power to obtain a preset power supply voltage and current. Since the input end of the charging module 151 is electrically connected to the adapter interface 140 and the output end of the charging module 151 is electrically connected to the load 200 of the electronic device 10 , the switch module 152 , and the power supply circuit 160 , the input power provided by the adapter interface 140 passes through the charging module 151 The rectified power supply voltage is provided to the load 200 to make the load 200 work normally. The power supply voltage is provided to the battery 130 through the switch module 152 so that the battery 130 can be charged to a fully charged state. The power supply voltage can also be output to the microprocessor through the power supply circuit 160 The controller 110 is used to ensure the normal operation of the microprocessor 110.

It should be noted that the load 200 of the electronic device 10 includes, but is not limited to, an external memory, a power module, a sensor, an audio device, a radio frequency module, and the like.

The voltage detection circuit 120 is used to detect the voltage value of the battery 130 in real time, and output the voltage value of the battery 130 to the microprocessor 110 .

In this embodiment, during the whole process of inserting an adapter into the adapter interface 140 , the voltage value of the battery 130 can be collected in real time by the voltage detection circuit 120 and output to the microprocessor 110 .

The microprocessor 110 is configured to control the switch module 152 to turn off when the voltage value of the battery 130 reaches a preset charging completion threshold, so that the charging management chip 150 is in a power saving mode.

In this embodiment, the charging completion threshold indicates that the battery 130 is in a fully charged state and charging is completed. After receiving the voltage value of the battery 130 fed back by the voltage detection circuit 120, the microprocessor 110 determines whether the battery 130 is fully charged according to the voltage value of the battery 130. When the battery 130 is fully charged, the control switch module 152 is turned off, and the At this time, the charge management chip 150 is in a ship mode. In the power saving mode, the power supply voltage output by the charging module 151 can also be supplied to the microprocessor 110 through the power supply circuit 160 while supplying power to the load 200 to ensure the normal operation of the microprocessor 110, while the battery 130 and the charging module The path between the output terminals of 151 is cut off, the power supply voltage output by the charging module 151 cannot charge the battery 130, and the battery 130 cannot reverse power supply to the load 200 through the switch module 152, and the power consumption rate of the battery 130 itself is greatly reduced. When the user forgets to pull out the adapter for a long time, the power of the battery 130 is effectively preserved, and the battery 130 is not frequently charged and discharged, thereby prolonging the life of the battery 130 .

It can be understood that when the electronic device 10 is in a charging state (that is, the charging of the battery 130 is not completed), the switch module 152 is in a closed state, and the power supply voltage rectified and output by the charging module 151 supplies power to the load 200 and also provides power through the switch module 152. Charge the battery 130 to a fully charged state, and supply it to the microprocessor 110 through the power supply circuit 160 to ensure the normal operation of the microprocessor 110; when the electronic device 10 is in a non-charging state (no adapter is inserted into the adapter interface) 140), or when the current required by the load 200 in the charging state is greater than the maximum capability that the adapter can provide, the switch module 152 is in a closed state, so that the battery 130 can provide power to the load 200 of the electronic device 10 through the switch module 152; when When the electronic device 10 changes from the charging state to the charging completion state (that is, the voltage value of the battery 130 reaches the preset charging completion threshold), the switch module 152 connecting the battery 130 and the load 200 is controlled to be disconnected, so that the battery 130 is not in either state. The charging state is also not in the discharging state, and the power consumption rate of the battery 130 is significantly reduced, which effectively prevents the battery 130 from frequently entering the charging and discharging cycle.

In practical applications, by cutting off the path between the battery 130 and the output end of the charging module 151 , the power supply voltage output by the charging module 151 cannot charge the battery 130 , and the battery 130 cannot reversely supply power to the load 200 through the switch module 152 . Although the power consumption speed of the battery 130 can be effectively reduced, the switch module 152 connected to the battery 130 will inevitably consume a small amount of power, so the voltage value of the battery 130 will also decrease with time. Based on this, the microprocessor 110 can also be used to control the switch module 152 to close when the charge management chip 150 is in the power saving mode, if the voltage value of the battery 130 drops to the over-discharge voltage of the battery 130 , so that the power supply voltage continues The battery 130 is charged through the output of the switch module 152 .

That is to say, when the charge management chip 150 is in a low power consumption state (ie, the power saving mode), the voltage value across the battery 130 is detected in real time by the voltage detection circuit 120 and fed back to the microprocessor 110. When the over-discharge voltage (eg, 3.0V) of the battery 130 is reduced, the microprocessor 110 sends a control signal to control the switch module 152 inside the charging management chip 150 to close, so that the input power provided by the adapter interface 140 is rectified and output by the charging module 151 . , while supplying power to the load 200 , the battery 130 can also be charged through the switch module 152 inside the charge management chip 150 to prevent the battery 130 from being over-discharged and affecting the life of the battery 130 . In the traditional charging scheme, the power consumption of the battery 130 is accelerated because the battery 130 and the output terminal of the charging module 151 are in a connected state, and the voltage value of the battery 130 is directly detected by the charging management chip 150. For 4.35V high-voltage lithium For the ion battery, generally, when the voltage value of the battery 130 drops to 4.23V or 4.14V (ie, the threshold Vrecharge set inside the charge management chip 150 ), the charge management chip 150 will automatically start charging. Since the over-discharge voltage of the battery 130 is lower than the threshold Vrecharge set inside the charge management chip 150 , in this embodiment of the present invention, the microprocessor 110 determines that the voltage value of the battery 130 is reduced to the over-discharge voltage of the battery 130 , and controls the switch module. 152 is closed so that the battery 130 is in a charging state, which can effectively prevent the battery 130 from being frequently turned on for charging and discharging, thereby further prolonging the life of the battery 130 .

Optionally, please refer to FIG. 2 , in order to facilitate the user to control the charging management chip 150 to exit the power saving mode, the charging control circuit 100 may further include a button module 170 , the charging management chip 150 may further include a button detection module 153 , and the button module 170 It is electrically connected to the key detection module 153 , and the key detection module 153 is electrically connected to the switch module 152 .

The button module 170 is configured to output a button signal to the button detection module 153 according to the user's pressing operation.

For example, an operation button is provided on the electronic device 10. When the operation button is not pressed, the pin of the button module 170 connected to the button detection module 153 in the charging management chip 150 is pulled up to a high level; when the operation button is pressed When the button module 170 is connected to the button detection module 153 in the charging management chip 150, the pin is pulled to a low level (ie, a button signal), and the button detection module 153 can identify the button signal.

The key detection module 153 is used to control the switch module 152 to close according to the key signal, so that the charging management chip 150 exits the power saving mode.

For example, after the key detection module 153 recognizes the key signal, it performs a specific control operation on the switch module 152, so that the switch module 152 is closed, the battery 130 and the output terminal of the charging module 151 are in a connected state, and the charging management chip 150 Exit power saving mode. At this time, if the user pulls out the adapter, the system power supply of the electronic device 10 will remain normal, and will not be powered off or restarted, thus ensuring the continuity of use.

Optionally, in order to avoid increasing the cost of additional BOM (Bill of Material, bill of materials) components and effectively save the layout area of PCB (Printed Circuit Board, printed circuit board), the existing physical operation buttons on the electronic device 10 can be used, Distinguish the user's menu operation and exit the power-saving mode according to the user's pressing time on the physical operation button, that is, by distinguishing the scene definition of the operation button under different pressing time, realize the exit of the power-saving mode. Specifically, the key detection module 153 is used to distinguish the user's menu operation and the charging management chip 150 to exit the power saving mode according to the duration of the key signal (ie, the duration of the user's pressing of the operation key), and the duration of the key signal reaches the set value. When the time is long, the control switch module 152 is closed, so that the charging management chip 150 exits the power saving mode.

That is to say, the key detection module 153 can judge whether to control the switch module 152 to close according to the duration of the user pressing the operation key, and then control the charging management chip 150 to exit the power saving mode; duration, it is determined that the user's pressing operation is a menu operation. The value of the set duration may be set according to actual needs; for example, the set duration may be 5 seconds.

In a feasible implementation manner, the switch module 152 may include a bidirectional controlled MOS transistor. In this case, the microprocessor 110 and the key detection module 153 can be connected to the gate of the bidirectional controlled MOS transistor, and the other two pins (ie the source and the drain) of the bidirectional controlled MOS transistor are connected to the battery 130 and the drain, respectively. The output terminal of the charging module 151 is connected.

管脚用于连接按键模块170；SYS管脚为充电模块151的输出端，用于连接负载200、供电电路160和开关模块152；BAT管脚用于连接开关模块152和电池130；VBUS管脚为充电模块151的输入端，用于连接适配器接口140。In a feasible implementation manner, the charging management chip 150 may select a charging chip. As shown in Figure 3, it is a schematic diagram of the circuit structure of the charging chip.

The pin is used to connect the button module 170; the SYS pin is the output end of the charging module 151, which is used to connect the load 200, the power supply circuit 160 and the switch module 152; the BAT pin is used to connect the switch module 152 and the battery 130; the VBUS pin It is the input end of the charging module 151 for connecting to the adapter interface 140 .

When the charging of the battery 130 is completed, the BATFETMOS transistor (ie, the switch module 152 ) is turned off by controlling the internal register bit BATFET_DIS of the charging chip to be 1. At this time, the battery 130 is neither in the charging state nor in the discharging state, and the battery life of the battery 130 be promoted. In addition, when an adapter is inserted into the adapter interface 140, before the control register bit BATFET_DIS is set to 1, the register bit BATFET_RST_VBUS can be controlled to be 1 first. Affected; that is, after the user unplugs the adapter, the charging chip is still in the power saving mode, which can reduce the power consumption speed of the battery 130. If the user needs the system of the electronic device 10 to supply power normally, he can exit the power saving mode by pressing the physical operation button , the system works normally.

It can be seen that, in the charging control circuit 100 provided by the embodiment of the present invention, during the charging process of the electronic device 10, especially when the user forgets to pull out the adapter for a long time of charging, the BATFET MOS tube is disconnected by controlling the register bit BATFET_DIS to be 1. Making the charging chip enter the power saving mode can prevent the battery 130 from repeatedly entering a charge-discharge cycle, thereby reducing damage to the battery 130 . When the voltage value of the battery 130 drops to a certain range (for example, 3.0V), the charging can be restarted by controlling the register bit BATFET_DIS to be 0.

According to the BATFET MOS tube parameter table shown in Figure 4, there is a certain difference in the quiescent current between the BATFET MOS tube in the enable state and the disable state; among them, the corresponding quiescent current range in the enable state is 9.5-15μA, and the quiescent current corresponding to the disable state The range is 7 to 9.5 μA. After the normal charging of the battery 130 is completed, the current flowing to the battery 130 through the BATFET MOS transistor is 0. However, since the BATFET MOS transistor is in the enabled state, its own leakage is relatively large, and the voltage value of the battery 130 will decrease at a relatively fast rate. Therefore, It is easy to cause the battery 130 to be repeatedly charged and discharged; in this embodiment, by controlling the BATFET MOS transistor to be in a disabled state and turning off the BATFET MOS transistor, the leakage of the BATFET MOS transistor itself can be reduced, and the battery life of the battery 130 can be improved, thereby reducing repeated charging and discharging. frequency.

Please refer to FIG. 5 , which is a schematic flowchart of a charging control method provided by an embodiment of the present invention. It should be noted that the charging control method of the embodiment of the present application is not limited to the specific sequence shown in FIG. 5 and the following. It should be understood that in other embodiments, the order of some steps in the charging control method of the embodiment of the present application may be based on It is actually necessary to exchange each other, or some of the steps can also be omitted or deleted. It should also be noted that the basic principles and technical effects of the charging control method provided by the embodiments of the present invention are the same as those of the above-mentioned embodiments. For the sake of brief description, for the parts not mentioned in this embodiment, reference may be made to the above-mentioned embodiments. corresponding content in . The charging control method can be applied to the above-mentioned charging control circuit 100 , and the specific flow shown in FIG. 5 will be described in detail below.

Step S501, the adapter interface provides input power for the charging module when an adapter is inserted.

Step S502, the charging module outputs a power supply voltage according to the input power supply; the power supply voltage is used to supply power to the load, and is outputted through the switch module to charge the battery and outputted through the power supply circuit to supply power to the microprocessor.

Step S503, the voltage detection circuit detects the voltage value of the battery in real time, and outputs the voltage value of the battery to the microprocessor.

Step S504 , when the voltage value of the battery reaches a preset charging completion threshold, the microprocessor controls the switch module to turn off, so that the charging management chip is in a power saving mode.

In the charging control method provided by the embodiment of the present invention, after it is detected that the charging of the battery 130 is completed, the switch module 152 is controlled to be disconnected, so that the path between the battery 130 and the output end of the charging module 151 is cut off, so that the power supply output by the charging module 151 is cut off. The voltage cannot charge the battery 130, and the battery 130 cannot reverse power supply to the load 200 through the switch module 152, which effectively reduces the power consumption speed of the battery 130. When the user forgets to unplug the adapter for a long time, the power of the battery 130 is effectively preserved. Consequently, the battery 130 is not frequently charged and discharged, thereby prolonging the life of the battery 130 .

Optionally, referring to FIG. 6 , the charging control method may further include the following steps:

Step S601, when the charge management chip is in the power saving mode, if the voltage of the battery drops to the over-discharge voltage of the battery, the microprocessor controls the switch module to close, so that the power supply voltage continues to be output to the battery through the switch module to charge the battery.

That is to say, when the charge management chip 150 is in the power saving mode, the voltage value across the battery 130 is detected in real time by the voltage detection circuit 120 and fed back to the microprocessor 110 . When the voltage is high, the microprocessor 110 sends a control signal to control the switch module 152 inside the charging management chip 150 to close, so that after the input power provided by the adapter interface 140 is rectified and output by the charging module 151, while supplying power to the load 200, it can also be charged. The switch module 152 inside the management chip 150 is provided to charge the battery 130 to avoid over-discharge of the battery 130 and affect the life of the battery 130 .

Optionally, referring to FIG. 7 , the charging control method may further include the following steps:

Step S701, the button module outputs a button signal to the button detection module according to the user's pressing operation.

Step S702, the key detection module controls the switch module to close according to the key signal, so that the charging management chip exits the power saving mode.

Wherein, this step S702 specifically includes: the key detection module distinguishes the user's menu operation and the charging management chip to exit the power saving mode according to the duration of the key signal, and when the duration of the key signal reaches the set duration, the control switch module is closed, so that the The charge management chip exits the power saving mode. In this way, the existing physical operation buttons on the electronic device 10 can be used to differentiate the scene definitions of the operation buttons under different pressing durations, so as to realize the exit of the power saving mode and save the hardware cost and PCB layout area.

In summary, the charging control circuit, charging control method and electronic device provided by the embodiments of the present invention include a microprocessor, a voltage detection circuit, a battery, an adapter interface, a charging management chip and a power supply circuit, and the charging management chip includes a charging The module and the switch module, the microprocessor is electrically connected with the voltage detection circuit, the switch module and the power supply circuit, the input end of the charging module is electrically connected with the adapter interface, the output end of the charging module is electrically connected with the load and the power supply circuit, and the switch module is also electrically connected. It is electrically connected to the output end of the charging module and the battery. The adapter interface provides input power for the charging module when an adapter is inserted, and the charging module outputs a power supply voltage according to the input power supply. The power supply voltage is used to supply power to the load, output to the battery through the switch module, and output to the microprocessor through the power supply circuit The voltage detection module detects the voltage value of the battery in real time, and outputs the voltage value of the battery to the microprocessor. When the voltage value of the battery reaches the preset charging completion threshold, the microprocessor controls the switch module to turn off, so that the The charge management chip is in power saving mode. In this way, after it is detected that the charging of the battery is completed, the switch module is controlled to be disconnected, so that the path between the battery and the output end of the charging module is cut off, so that the power supply voltage output by the charging module cannot charge the battery, and the battery cannot pass through. The switch module reverses power supply to the load, which effectively reduces the power consumption speed of the battery. When the user forgets to unplug the adapter for a long time, the battery power is effectively preserved, and the battery will not be charged and discharged frequently, thereby prolonging the battery life. In addition, when the charge management chip is in the power-saving mode, the voltage value across the battery is detected in real time through the voltage detection circuit and fed back to the microprocessor. When the voltage value of the battery drops to the over-discharge voltage of the battery, the microprocessor sends a control signal. Control the switch module inside the charge management chip to close, so that after the input power provided by the adapter interface is rectified and output by the charge module, while supplying power to the load, it can also be supplied to the battery through the switch module inside the charge management chip to charge the battery to avoid battery over-discharge , affecting battery life. When the charging management chip is in the power saving mode, the user can control the charging management chip to exit the power saving mode by pressing the physical operation button, so that the switch path connected between the battery and the output end of the charging module is opened. , the system power supply of electronic equipment can be maintained normally, and it will not be powered off or restarted to ensure the continuity of use.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. A charging control circuit is characterized by comprising a microprocessor, a voltage detection circuit, a battery, an adapter interface, a charging management chip and a power supply circuit, wherein the charging management chip comprises a charging module and a switch module;

the adapter interface is used for providing an input power supply for the charging module when an adapter is inserted;

the charging module is used for outputting power supply voltage according to the input power supply; the power supply voltage is used for supplying power to the load, is output to the battery through the switch module and is output to the microprocessor through the power supply circuit to supply power;

the voltage detection circuit is used for detecting the voltage value of the battery in real time and outputting the voltage value of the battery to the microprocessor;

the microprocessor is used for controlling the switch module to be switched off when the voltage value of the battery reaches a preset charging completion threshold value, so that the charging management chip is in a power-saving mode.

2. The charging control circuit of claim 1, wherein the microprocessor is further configured to control the switch module to close if the voltage value of the battery decreases to an overdischarge voltage of the battery when the charging management chip is in the power saving mode, so that the power supply voltage continues to be output to the battery through the switch module for charging the battery.

3. The charging control circuit of claim 1, wherein the charging control circuit further comprises a key module, the charging management chip further comprises a key detection module, the key module is electrically connected to the key detection module, and the key detection module is electrically connected to the switch module;

the key module is used for outputting a key signal to the key detection module according to the pressing operation of a user;

the key detection module is used for controlling the switch module to be closed according to the key signal so as to enable the charging management chip to exit the power saving mode.

4. The charging control circuit of claim 3, wherein the key detection module is configured to distinguish a menu operation of a user and the exit of the charging management chip from the power saving mode according to a duration of the key signal, and control the switch module to be closed when the duration of the key signal reaches a preset duration, so that the charging management chip exits from the power saving mode.

5. The charge control circuit according to any of claims 1-4, wherein the switching module comprises a bidirectional controlled MOS transistor.

6. A charging control method is characterized by being applied to a charging control circuit, wherein the charging control circuit comprises a microprocessor, a voltage detection circuit, a battery, an adapter interface, a charging management chip and a power supply circuit, the charging management chip comprises a charging module and a switch module, the microprocessor is electrically connected with the voltage detection circuit, the switch module and the power supply circuit, the input end of the charging module is electrically connected with the adapter interface, the output end of the charging module is electrically connected with a load and the power supply circuit, and the switch module is also electrically connected with the output end of the charging module and the battery; the method comprises the following steps:

when the adapter is inserted into the adapter interface, the adapter interface provides an input power supply for the charging module;

the charging module outputs a power supply voltage according to the input power supply; the power supply voltage is used for supplying power to the load, is output to the battery through the switch module and is output to the microprocessor through the power supply circuit to supply power;

the voltage detection circuit detects the voltage value of the battery in real time and outputs the voltage value of the battery to the microprocessor;

and when the voltage value of the battery reaches a preset charging completion threshold value, the microprocessor controls the switch module to be switched off so as to enable the charging management chip to be in a power saving mode.

7. The method of claim 6, further comprising:

when the charging management chip is in a power-saving mode, if the voltage value of the battery is reduced to the overdischarge voltage of the battery, the microprocessor controls the switch module to be closed, so that the power supply voltage is continuously output to the battery through the switch module to charge the battery.

8. The method of claim 6, wherein the charging control circuit further comprises a key module, the charging management chip further comprises a key detection module, the key module is electrically connected with the key detection module, and the key detection module is electrically connected with the switch module; the method further comprises the following steps:

the key module outputs a key signal to the key detection module according to the pressing operation of the user;

and the key detection module controls the switch module to be closed according to the key signal so as to enable the charging management chip to exit the power saving mode.

9. The method of claim 8, wherein the key detection module controls the switch module to close according to the key signal, so that the charging management chip exits the power saving mode, and the method comprises:

the key detection module distinguishes menu operation of a user and exit of the charging management chip from the power saving mode according to the duration of the key signal, and controls the switch module to be closed when the duration of the key signal reaches a set duration, so that the charging management chip exits from the power saving mode.

10. An electronic device comprising a load and the charge control circuit of any one of claims 1-5.

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