CN103219769B - Method for charging batteries, batter-charghing system and mobile terminal - Google Patents

Abstract

The invention discloses a battery charging method, which is used for charging a battery of an electronic device, comprising the following steps: controlling the power supply current output by the power supply terminal of the electronic device to be a first preset value in an initial state, detecting the charging current of the battery, Judging the working state of the system of the electronic device and the charging state of the battery according to the magnitude of the charging current, and reducing the magnitude of the power supply current so that the battery is in a low-power charging state when the system is in a working state or in a busy state Or stop charging, and keep the supply current at the first preset value when the system is in a standby state or a low power consumption state, so as to achieve the purpose of reducing the temperature rise of the whole machine by dynamically adjusting the charging current under charging, so that The system will not overheat due to battery charging during operation. The invention also discloses a corresponding battery charging system and a mobile terminal with the battery charging system.

Description

Battery charging method, battery charging system and mobile terminal

technical field

The invention relates to the field of electronics, in particular to a battery charging method and a battery charging system for charging electronic equipment.

Background technique

With the development of smart phones, large screens, high-resolution display screens, high-pixel cameras, and some are even equipped with external ISP image processing chips to improve the photo effect. Support HD video playback. At the same time, the functions of mobile games are becoming more and more powerful. Many games that could only be played on computers before can also be played on mobile phones. All of these will greatly increase the power consumption of the mobile phone, that is, the current consumption is very large, and the temperature rise of the mobile phone will increase accordingly. Especially now that smart phones are becoming more and more light and thin, the heat dissipation space of mobile phones is further compressed, which makes the thermal design of mobile phones face great difficulties, and it is also a hot research topic at present.

After research, playing high-definition video, taking pictures in high-definition mode, playing games and charging are the four main factors for the temperature rise of mobile phones. If charging + HD camera or charging + HD video playback or charging + games at the same time, the temperature rise of the mobile phone will further increase, which can reach more than 60 degrees or even higher. For smart phones, playing games while charging, and playing high-definition videos while charging (such as watching movies online) are often encountered scenarios. Users have a very bad impression and experience, and even make users worry about security issues.

Therefore be badly in need of a kind of novel charging method that can solve the above problems.

Contents of the invention

The purpose of the present invention is to provide a battery charging method, which dynamically adjusts the charging current through the detection of the charging current flowing to the battery by the mobile phone during charging, so as to achieve the purpose of reducing the temperature rise of the whole machine, so that the system does not It can become overheated due to battery charging.

Another object of the present invention is to provide a battery charging system that prevents the system of the electronic device from overheating due to battery charging during operation.

Another object of the present invention is to provide a mobile terminal, which will not be overheated due to battery charging during operation.

A battery charging method for charging a battery of an electronic device, comprising the following steps: (1) controlling the power supply current output by the power supply terminal of the electronic device to be a first preset value; (2) detecting the charging current of the battery, Judging the working state of the system of the electronic device and the charging state of the battery according to the magnitude of the charging current, and reducing the magnitude of the supply current so that the battery is in a low-power charging state when the system is in a working state or in a busy state Or stop charging, and keep the supply current at the first preset value when the system is in a standby state or a low power consumption state, so as to achieve the purpose of reducing the temperature rise of the whole machine by dynamically adjusting the charging current under charging, so that The system will not overheat due to battery charging during operation.

Preferably, the step (2) specifically includes: detecting the magnitude of the charging current of the battery, and adjusting the magnitude of the supply current when the charging current is smaller than a second preset value so that the charging current is smaller than a third preset value. Setting a value, returning to step (1) when the charging current is greater than a second preset value, the first preset value is greater than a second preset value, and the second preset value is greater than a third preset value. The present invention judges that the system is in a working state or a busy state when the power supply current is the first preset value and the charging current is less than the second preset value; When the value is set, it is judged that the battery is in a low-power charging state or a charging stop state, otherwise the battery is in a high-power charging state. Of course, whether the present invention limits the charging current when the system enters the working state or limits the charging current when the system enters the busy state is determined by the size of the second preset value, the first preset value, the second preset value and the third preset value All can be set by technicians according to needs.

Specifically, the step (2) specifically includes: (21) detecting whether the charging current of the battery is less than the second preset value, and if so, performing the next step, otherwise returning to step (21); (22) adjusting the supply current (23) Detect whether the charging current is less than a second preset value, if so, return to step (22), otherwise return to step (1). More specifically, the step (22) is: detecting whether the charging current is less than a third preset value, and if so, performing step (23), otherwise returning to step (22) after reducing the magnitude of the supply current. Wherein, when reducing the magnitude of the supply current, each reduction can be a preset fixed value, or an estimated value can be calculated according to the magnitude of the charging current.

Specifically, the first preset value is 1 ampere, the second preset value is less than or equal to 700 mA and greater than or equal to 500 mA, and the third preset value is less than or equal to 300 mA and greater than or equal to 50 mA.

Preferably, the method for detecting the charging current is: connecting a detection resistor in series between the charging terminal of the battery and the power supply terminal of the electronic device, and measuring the magnitude of the charging current through the detection resistor.

The present invention also provides a battery charging system for charging the battery of an electronic device, including a detection circuit, a processing unit, and a charging control unit. The detection circuit detects the charging current of the battery; The magnitude of the current judges the working state of the system of the electronic device and the charging state of the battery, and generates a current-down signal when the system is in a working state or a busy state and the battery is in a high-power charging state, and when the system is in a standby state A constant current signal is generated in the state or a low power consumption state; the charging control unit is used to output a supply current of a first preset value to supply power to the system and battery of the electronic device, and control the charging control unit according to the constant current signal The size of the power supply current maintains the first preset value, and the size of the power supply current is reduced according to the current-down signal, so that the charging current can be dynamically adjusted during charging to achieve the purpose of reducing the temperature rise of the whole machine, so that the system will not be damaged by the battery when it is working. Charging and the temperature is too high. Wherein, the processing unit divides the charging state of the battery into: stop charging (the magnitude of the charging current is roughly equal to zero), high-power charging state and low-power charging state according to the magnitude of the charging current.

Preferably, the processing unit generates a current-down signal when the charging current is less than a second preset value and greater than a third preset value, and generates a constant-current signal when the charging current is greater than a second preset value, so The first preset value is greater than the second preset value, and the second preset value is greater than the third preset value. Wherein, the present invention judges that the system is in the working state or busy state when the power supply current is the first preset value and the charging current is less than the second preset value; When three preset values are used, it is judged that the battery is in a low-power charging state or a charging stop state, otherwise the battery is in a high-power charging state.

Specifically, the first preset value is 1 ampere, the second preset value is less than or equal to 700 mA and greater than or equal to 500 mA, and the third preset value is less than or equal to 300 mA and greater than or equal to 50 mA.

Preferably, the detection current is a detection resistor connected in series between the charging terminal of the battery and the power supply terminal of the charging control unit.

The present invention also provides a mobile terminal, which includes the above-mentioned battery charging system, so that when the mobile terminal is working in the system, the temperature of the electronic equipment will not be too high due to battery charging.

Description of drawings

Fig. 1 is a flowchart of a method for charging a battery in a mobile terminal according to the present invention.

Fig. 2 is a structural block diagram of the battery charging system of the present invention.

detailed description

In order to describe the technical content, structural features, achieved goals and effects of the present invention in detail, the following will be described in detail in conjunction with the embodiments and accompanying drawings.

The invention discloses a method for charging a battery in a mobile terminal. In the method, the initial state of charging controls the power supply current output by the power supply terminal of the electronic device to be a first preset value, and judges the operation of the system by detecting the charging current of the battery in real time. state and the charging state of the battery, and keep the supply current at the first preset value when the system of the electronic device is in the standby state, and adjust the magnitude of the supply current so that the battery is in the working state or busy state Low-power charging state or stop charging, so that the temperature of the electronic device will not be too high due to battery charging when the system is working.

Referring to FIG. 1 , in the present invention, the method 100 for charging a battery in a mobile terminal includes the following steps: (11) controlling the magnitude of the power supply current I1 output by the power supply terminal of the electronic device to be 1A, (12) judging the charging of the battery Whether the current I2 is less than 700mA, and when the charging current I2 is less than 700mA, judge that the system of the mobile terminal is in a busy state and perform step (13); (13) determine whether the charging current I2 is less than 300mA, and if so, perform step (15) ), otherwise execute step (14); (14) reduce the size of the supply current I1 and return to step (13), the specific method can be reduced by a fixed value at a time, or an estimated value can be reduced according to the magnitude of the charging current to Make the charging current I2 less than 200mA; (15) judge whether the charging current I2 is greater than or equal to 700mA, if otherwise the system is still in a busy state, then return to step (13), if so, the system returns to the standby state or the low power consumption state, then Return to step (11). In this embodiment, the charging current I2 equal to 700mA is judged as a low power consumption state, of course, the charging current I2 equal to 700mA can also be judged as a busy state, which can be set by technical personnel. Similarly, in this embodiment, the charging current I2 equal to 300mA is judged as the high-power charging state, of course, the charging current I2 equal to 300mA can also be judged as the low-power charging state, which can be set by technical personnel.

Among them, 1A is the preset first preset value, 700mA is the preset second preset value, 300mA is the preset third preset value, and the first preset value, the second preset value and the third The preset values are not limited to 1A, 700mA and 300mA, and the specific values can be set by technicians according to actual needs. Preferably, the second preset value can be selected within an interval of less than or equal to 700 mA and greater than or equal to 500 mA, and the third preset value can be selected within an interval of less than or equal to 300 mA and greater than or equal to 50 mA .

Referring to Fig. 2, the present invention also discloses a mobile terminal, the mobile terminal has a battery charging system 200, the battery charging system 200 includes a detection circuit 23, a processing unit 22, a charging control unit 21, the detection circuit 23 detects the battery The magnitude of the charging current I2 of 32; the processing unit 22 judges the magnitude of the charging current I2, and generates a flow-down signal when the charging current I2 is less than the second preset value and greater than the third preset value, and the charging current I2 Generate a constant current signal when I2 is greater than or equal to the second preset value; the charging control unit 21 is used to output the supply current I1 to supply power to the system 31 and battery 32 of the electronic device, and control the supply current according to the constant current signal The magnitude of I1 is maintained at a first preset value, and the magnitude of the supply current I1 is reduced according to the current down signal. Wherein, the first preset value is 1 ampere, the second preset value is less than or equal to 700 mA and greater than or equal to 500 mA, and the third preset value is less than or equal to 300 mA and greater than or equal to 50 mA.

Preferably, the detection current I1 is a detection resistor connected in series between the charging terminal of the battery 32 and the power supply terminal of the charging control unit 21 .

Referring to FIG. 2 , the working principle of the battery charging system 200 is specifically described: after the charging terminal of the mobile terminal is supplied with power, the charging control unit 21 outputs a supply current I1 with a size of 1A, and the detection circuit 23 detects the charging of the battery 32. The magnitude of the current I2. When the system 31 is in the standby state, the charging current I2 is slightly equal to the supply current I1, so the charging current I2 must be greater than the second preset value. At this time, the processing unit 22 outputs a constant current signal, and the charging control The unit 21 controls the power supply current I1=1A, that is, the power supply current I1 is maintained at 1A; when the system 31 is in the working state, since the power consumption of the system 31 generally exceeds 300mA, it is judged whether the charging current I2 is less than 700mA, and if so, it is judged When the system is in the working state, the processing unit outputs a current-down signal, and the charging control unit 21 reduces the magnitude of the supply current I1 according to the current-down signal until the charging current I2 is less than or equal to 300mA.

In summary, since the supply current I1 is equal to the sum of the charging current I2 of the battery 32 and the power consumption current I3 of the system, when the power supply current I1 is constant, it can be judged whether the power consumption current I3 of the system exceeds the limit by detecting the magnitude of the charging current I2 value, to determine whether the system is in a working state or a busy state, so the present invention reduces the charging current I2 by reducing the supply current I1 when the system is in a working state or a busy state, until the battery 32 is in a low-power charging state or stops charging, so that the mobile The terminal can work without overheating due to battery charging while the system is working.

What is disclosed above is only a preferred embodiment of the present invention, and of course it cannot limit the scope of rights of the present invention. Therefore, equivalent changes made according to the patent scope of the present invention still fall within the scope of the present invention.

Claims (10)

1. A method for charging a battery, for charging the battery of an electronic device, comprising the following steps: (1) The power supply current output by the power supply end of the control electronic equipment is a first preset value; (2) Detect the magnitude of the charging current of the battery, judge the operating state of the system of the electronic device and the charging state of the battery according to the magnitude of the charging current, and reduce the The magnitude of the supply current is such that the battery is in a low-power charging state, and the supply current is kept at a first preset value when the system is in a standby state or a low power consumption state; Wherein, when the system is in a working state or a busy state, the step of reducing the magnitude of the power supply current so that the battery is in a low-power charging state includes: adjusting the power supply when the charging current is less than a second preset value The magnitude of the current is such that the charging current is smaller than a third preset value, the first preset value is larger than a second preset value, and the second preset value is larger than the third preset value. 2. The battery charging method according to claim 1, characterized in that: the step (2) is specifically: detecting the magnitude of the charging current of the battery, and adjusting the charging current when the charging current is less than a second preset value. The magnitude of the supply current is such that the charging current is less than a third preset value, and returns to step (1) when the charging current is greater than a second preset value, the first preset value is greater than the second preset value, and the The second preset value is greater than the third preset value. 3. The battery charging method according to claim 2, wherein said step (2) specifically comprises: (21) detecting whether the charging current of the battery is less than a second preset value, if so, execute the next step, if otherwise Return to step (21); (22) reduce the magnitude of the supply current so that the charging current is less than a third preset value; (23) detect whether the charging current is less than a second preset value, if so, return to step (22 ), otherwise return to step (1). 4. The battery charging method according to claim 2, wherein the first preset value is 1 ampere, the second preset value is less than or equal to 700 mA and greater than or equal to 500 mA, and the third preset value is The set value is less than or equal to 300mA and greater than or equal to 50mA. 5. The battery charging method according to claim 1, wherein the method for detecting the charging current is: connecting a detection resistor in series between the charging terminal of the battery and the power supply terminal of the electronic device, and measuring The magnitude of the charging current. 6. A battery charging system for charging a battery of an electronic device, comprising: The detection circuit detects the charging current of the battery; The processing unit judges the working state of the system of the electronic device and the charging state of the battery according to the magnitude of the charging current, and generates a current-down signal when the system is in a working state or a busy state and the battery is in a high-power charging state , generating a constant current signal when the system is in a standby state or a low power consumption state; The charging control unit is configured to output a power supply current with a magnitude of a first preset value to supply power to the system and battery of the electronic device, and control the magnitude of the power supply current to maintain the first preset value according to the constant current signal. The flow signal reduces the magnitude of the supply current; Wherein, the processing unit generates a current-down signal when the charging current is less than a second preset value and greater than a third preset value, the first preset value is greater than a second preset value, and the second preset The value is greater than the third preset value. 7. The battery charging system according to claim 6, wherein the processing unit generates a constant current signal when the charging current is greater than a second preset value. 8. The battery charging system according to claim 7, wherein the first preset value is 1 ampere, the second preset value is less than or equal to 700 mA and greater than or equal to 500 mA, and the third preset value is The set value is less than or equal to 300mA and greater than or equal to 50mA. 9. The battery charging system according to claim 6, wherein the detection circuit comprises a detection resistor connected in series between the charging terminal of the battery and the power supply terminal of the charging control unit. 10. A mobile terminal, characterized by comprising the battery charging system according to any one of claims 6-9.