WO2018053724A1 - Mobile terminal, charging method, and charging system - Google Patents

Abstract

The present disclosure relates to the technical field of charging. Provided are a mobile terminal, a charging method, and a charging system. The mobile terminal comprises a hardware charging interface, a battery management chip electrically connected to the hardware charging interface, and a battery electrically connected to the battery management chip. The hardware charging interface is used for receiving a direct voltage transmitted by a power adapter through a charging wire, and for inputting the direct voltage to the battery management chip. The battery management chip is used for computing an impedance of the charging wire according to an actual voltage value of the collected direct voltage and an actual current value; the battery management chip is also used for setting a charging current according to the impedance of the charging wire, and charging the battery according to the set charging current. By means of embodiments of the present disclosure, hidden safety hazards caused by high heat generated by a bad-quality charging wire when charging is performed by using the bad-quality charging wire having a high impedance are avoided, thereby improving the safety of a charging process of a mobile terminal.

Description

Mobile terminal, charging method and charging system Technical field

The present disclosure relates to the field of charging technologies, and in particular, to a mobile terminal, a charging method, and a charging system.

Background technique

The charger is a charging device composed of a power adapter and a charging cable, and in order to improve the portability of the charger, the power adapter and the charging cable are usually in a detachable structure.

When the user combines the power adapter and the charging cable, simply plug the connector of the charging cable into the adapter connector of the power adapter. According to the calculation formula of the heating power P=I ² ×R, when the current is constant, the higher the impedance of the charging line is, the higher the heat generation of the charging line is. Therefore, it is more difficult to charge the inferior charging line with a larger impedance. A big security risk.

Summary of the invention

The present disclosure provides a mobile terminal, a charging method, and a charging system. The technical solution is as follows:

In a first aspect, a mobile terminal is provided. The mobile terminal includes: a hardware charging interface, a battery management chip electrically connected to the hardware charging interface, and a battery electrically connected to the battery management chip;

a hardware charging interface for receiving a DC voltage transmitted by the power adapter through the charging line; an input DC voltage to the battery management chip;

a battery management chip, configured to calculate an impedance of the charging line according to the actual voltage value of the collected DC voltage and the actual current value;

The battery management chip is also used to set the charging current according to the impedance of the charging line; the battery is charged according to the set charging current.

Optionally, the battery management chip is electrically connected to the hardware charging interface through a VBus (Voltage Bus, voltage bus pin) and GND (GROUND, ground pin);

a battery management chip for receiving a DC voltage input through a hardware charging interface through the VBus;

The battery management chip is further configured to collect at least two sets of test data at the VBus, each set of test data includes an actual voltage value and an actual current value at the VBus; and the impedance of the charging line is calculated according to at least two sets of test data.

Optionally, the battery management chip is further electrically connected to the hardware charging interface through D+ (Data+, data plus pin) and D-(Data-, data minus pin);

The battery management chip is further configured to send a test command to the power adapter through D+ or D- when detecting the connection with the power adapter, the test command is used to instruct the power adapter to output a constant voltage value of the DC voltage;

The battery management chip is further configured to charge the battery with the first charging current; collect the first test data at the VBus, the first test data includes the first actual voltage value V ₁ at the VBus and the first actual current value I ₁ ;

The battery management chip is further configured to charge the battery with the second charging current; collect the second test data at the VBus, the second test data includes the second actual voltage value V ₂ and the second actual current value I ₂ at the VBus;

a battery management chip, configured to calculate an impedance of the charging line according to the first test data and the second test data;

Wherein, the impedance of the charging line = (V ₁ - V ₂ ) / (I _{2 -} I ₁ ), and the first charging current ≠ the second charging current ≤ the rated charging current, and the rated charging current refers to the maximum charging current for charging the battery.

Optionally, the battery management chip is configured to determine a charging current down-regulation coefficient according to the impedance of the charging line; the charging current is set according to the charging current lowering coefficient and the rated charging current, and the rated charging current refers to a maximum charging current for charging the battery.

Optionally, the battery management chip is electrically connected to the processor;

a battery management chip for transmitting a set charging current to the processor;

The processor is configured to control the display screen to display a prompt message when the set charging current is less than the preset current threshold, and the prompt information is used to prompt the user to replace the charging line.

Optionally, the mobile terminal further includes a temperature sensor, the temperature sensor is electrically connected to the processor, and the battery control chip is electrically connected to the processor;

The processor is configured to obtain an ambient temperature collected by the temperature sensor; when the ambient temperature is greater than the preset temperature threshold, send a control command to the battery management chip, where the control command is used to indicate that the set charging current is lowered;

The battery management chip is also used to lower the set charging current according to the control command.

In a second aspect, a charging method is provided for the mobile terminal according to the first aspect, the method comprising:

Receiving the DC voltage input from the hardware charging interface, the DC voltage is passed by the power adapter through the charging line Hardware charging interface transmission;

Calculating the impedance of the charging line according to the actual voltage value of the collected DC voltage and the actual current value;

Setting the charging current according to the impedance of the charging line;

The battery is charged according to the set charging current.

Optionally, the impedance of the charging line is calculated according to the actual voltage value of the collected DC voltage and the actual current value, including:

Collecting at least two sets of test data at the VBus, each set of test data including an actual voltage value and an actual current value at the VBus;

The impedance of the charging line is calculated based on at least two sets of test data.

Optionally, at least two sets of test data at the VBus are collected, including:

Send a test command to the power adapter via D+ or D- when a connection to the power adapter is detected;

Charging the battery with the first charging current, and collecting first test data at the VBus, the first test data including the first actual voltage value V ₁ at the VBus and the first actual current value I ₁

Charging the battery with the second charging current, and collecting the second test data at the VBus, the second test data including the second actual voltage value V ₂ and the second actual current value I ₂ at the VBus;

Calculate the impedance of the charging line based on at least two sets of test data, including:

Calculating an impedance of the charging line according to the first test data and the second test data;

Wherein, the impedance of the charging line = (V ₁ - V ₂ ) / (I _{2 -} I ₁ ), and the first charging current ≠ the second charging current ≤ the rated charging current, and the rated charging current refers to the maximum charging current for charging the battery.

Optionally, the charging current is set according to the impedance of the charging line, including:

Determining the charging current down-regulation coefficient according to the impedance of the charging line;

The charging current is set according to the charging current down-regulation coefficient and the rated charging current. The rated charging current refers to the maximum charging current for charging the battery.

Optionally, the method further includes:

The set charging current is sent to the processor, and the processor is configured to control the display screen to display a prompt message when the set charging current is less than the preset current threshold, and the prompt information is used to prompt the user to replace the charging line.

Optionally, the method further includes:

Receiving, by the processor, a control instruction sent by the processor, when the processor detects that the ambient temperature is greater than a preset temperature threshold, and is used to indicate that the set charging current is lowered;

According to the control command, the set charging current is lowered.

In a third aspect, a charging system is provided, the charging system including a power adapter and a mobile terminal;

The power adapter and the mobile terminal are connected by a charging line;

The mobile terminal includes the mobile terminal as described in the first aspect.

The technical solutions provided by the embodiments of the present disclosure may include the following beneficial effects:

The battery management chip inside the mobile terminal collects the actual voltage value and the actual current value of the input DC voltage before charging the battery, and further calculates the impedance of the charging line according to the actual voltage value and the actual current value, thereby resetting according to the impedance. The charging current for charging the battery reduces the heat generation of the charging line during charging, and avoids the safety hazard caused by the inferior charging line charging when the inferior charging line with large impedance is used for charging, thereby improving the charging of the mobile terminal. Process security.

The above general description and the following detailed description are intended to be illustrative and not restrictive.

DRAWINGS

The accompanying drawings, which are incorporated in the claims of the claims

1 is a block diagram showing the structure of a charging system provided by an exemplary embodiment;

2 is a block diagram showing the structure of a charging system provided by another exemplary embodiment;

FIG. 3 is a block diagram showing the structure of a charging system provided by still another exemplary embodiment;

4 is a block diagram showing the structure of a charging system provided by still another exemplary embodiment;

FIG. 5 shows a flow chart of a charging method provided by an exemplary embodiment;

FIG. 6 shows a flow chart of a charging method provided by another exemplary embodiment;

FIG. 7A is a flow chart showing a charging method provided by still another exemplary embodiment; FIG.

7B is a schematic view showing the implementation of the charging method shown in FIG. 7A;

FIG. 8 is a flow chart showing a charging method provided by still another exemplary embodiment;

FIG. 9 is a structural block diagram of a mobile terminal according to an exemplary embodiment.

detailed description

The illustrative embodiments will be described in detail herein, examples of which are illustrated in the accompanying drawings. The following description refers to the same or similar elements in the different figures unless otherwise indicated. The embodiments described in the following illustrative embodiments do not represent all embodiments consistent with the present disclosure. Rather, they are only related to some aspects of the present disclosure as detailed in the appended claims. Examples of consistent devices and methods.

"Multiple" as referred to herein means two or more. "and/or", describing the association relationship of the associated objects, indicating that there may be three relationships, for example, A and/or B, which may indicate that there are three cases where A exists separately, A and B exist at the same time, and B exists separately. The symbol "/" generally indicates that the contextual object is an "or" relationship.

FIG. 1 is a block diagram showing the structure of a charging system provided by an exemplary embodiment. The charging system includes a power adapter 110, a charging line 120, and a mobile terminal 130, wherein the power adapter 110 and the mobile terminal 130 are connected by a charging line 120.

The power adapter 110 and the charging line 120 constitute a charger for charging the mobile terminal 130. When the power adapter 110 is externally connected to the power source, the power adapter 110 inputs an AC voltage (such as 220V through an internal voltage conversion chip (not shown). The AC voltage is converted to a DC voltage (such as a 5V DC voltage) and transmitted to the mobile terminal 130 via the charging line 120.

Optionally, the power adapter 110 and the charging line 120 are of a unitary structure or a separable structure.

As shown in FIG. 1 , the mobile terminal 130 includes a hardware charging interface 131 , a battery management chip 132 electrically connected to the hardware charging interface 131 , and a battery 133 electrically connected to the battery management chip 132 .

The mobile terminal 130 is connected to the charging line 120 through the hardware charging interface 131, thereby receiving the DC voltage transmitted by the power adapter 110 through the charging line 120, and inputting the DC voltage to the connected battery management chip 132.

Optionally, the hardware charging interface 131 can be a USB (Universal Serial Bus) 2.0 interface, a USB 3.0 interface, a Type C interface, or a Lightning interface; correspondingly, the charging line 120 can be a USB 2.0. The data line, USB 3.0 data line, Type C data line or Lightning data line, the present disclosure does not define the type of hardware charging interface 131 and charging line 120.

The battery management chip 132 in the mobile terminal 130 is provided with a voltage and current detecting function. When receiving the input DC voltage, the battery management chip 132 can collect the actual voltage value and the actual current value of the DC voltage.

Since the charging line 120 has a certain impedance, when the DC voltage flows through the charging line 120, the charging line 120 shares a part of the voltage. Accordingly, the actual voltage value measured by the battery management chip 132 is smaller than the voltage value of the output voltage of the power adapter 110. According to the impedance calculation formula R=U/I, the battery management chip 132 can calculate the resistance of the charging line 120 according to the collected actual voltage value and the actual current value. anti.

The battery management chip 132 further includes a charging current adjustment function, by which the battery management chip 132 adjusts (eg, down-regulates) the charging current according to the calculated impedance of the charging line 120, thereby passing the internal charging according to the adjusted charging current. A battery charging circuit (not shown) charges the connected battery 133.

Optionally, when the impedance of the charging line 120 is large, the battery management chip 132 lowers the charging current, and the decreasing ratio of the charging current is proportional to the impedance of the charging line 120, that is, the greater the impedance, the greater the proportion of the charging current is lowered. The smaller the impedance, the smaller the down regulation ratio of the charging current.

It should be noted that when the mobile terminal is charged by using a charging function device (such as a mobile power source or a desktop computer or the like), the mobile terminal 130 in FIG. 1 can also adjust the charging current according to the calculated impedance of the charging line. This disclosure is not limited thereto.

Through the above charging current adjustment mechanism, when charging is performed using a poor quality charging line, the battery management chip lowers the charging current due to the large impedance of the inferior charging line, thereby reducing the heat generation of the charging line and avoiding the excessive heat generation of the charging line. Security risks.

In summary, in this embodiment, the battery management chip inside the mobile terminal collects the actual voltage value and the actual current value of the input DC voltage before charging the battery, and further calculates the charging line according to the actual voltage value and the actual current value. The impedance is thus reset to the charging current of the battery charging according to the impedance, thereby reducing the heat generation of the charging line during charging, and avoiding the use of a poor quality charging line for charging, because the inferior charging line generates a large amount of heat. The safety hazard caused by the safety of the mobile terminal is improved.

On the basis of the charging system shown in FIG. 1, as shown in FIG. 2, the battery management chip 132 includes VBus and GND, and the battery management chip 132 is electrically connected to the hardware charging interface 131 through VBus and GND.

After receiving the DC voltage transmitted by the charging line 120, the hardware charging interface 131 inputs a DC voltage to the battery management chip 132 through the VBus. Accordingly, the battery management chip 132 receives the DC voltage through the VBus. The DC voltage flowing through the battery management chip 132 flows out of GND (low potential) and flows through the charging line 120 to the power adapter 110 to form a complete charging circuit.

In the process of calculating the impedance of the charging line 120, the battery management chip 132 collects at least two sets of test data at the VBus, and calculates the impedance of the charging line according to the at least two sets of test data, wherein each set of test data includes simultaneous acquisition. The actual voltage value and actual current value at the VBus.

Optionally, when two sets of test data are collected, the battery management chip 132 calculates the impedance of the charging line 120 according to the two sets of test data;

Optionally, when n sets of test data are collected, n≥3, the battery management chip 132 calculates an impedance reference value according to each set of test data, and averages n(n-1)/2 impedance reference values. The value is determined as the impedance of the charging line 120.

The specific process of calculating the impedance of the charging line 120 by the battery management chip 132 is schematically illustrated below.

As shown in FIG. 2, the battery management chip 132 further includes D+ and D-, and the battery management chip 132 is electrically connected to the hardware charging interface 131 through D+ and D-, and the D+ and D- are used for data or signal transmission.

In order to ensure that the DC voltage output by the power adapter 110 remains unchanged during the calculation of the impedance, the battery management chip 120 transmits a test command to the power adapter 110 via D+ or D- when detecting the connection with the power adapter, the test command is used for A DC voltage indicating that the power adapter 110 outputs a constant voltage value.

Optionally, the test command further includes an output voltage value for indicating a DC voltage output by the power adapter 110 at the output voltage value, wherein the output voltage value is less than or equal to a maximum charging voltage of the mobile terminal.

Correspondingly, after receiving the test command, the power adapter 110 converts the AC voltage into a DC voltage of a constant voltage value through an internal voltage conversion chip, and transmits a DC voltage to the mobile terminal 130 through the charging line 120.

Optionally, while outputting a constant DC voltage, the power adapter 110 sends a feedback command to the mobile terminal 130 through an internal adapter management chip (not shown) for indicating that the DC voltage is being output at a constant voltage value. .

The battery management chip 132 has a charging current adjustment function. For example, the battery management chip 132 can adjust the charging current through a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transisto). When receiving the feedback command sent by the power adapter 110, the battery management chip 132 controls to charge the battery 133 with the first charging current, and during the charging process, the battery management chip 132 collects the first actual voltage value V ₁ at the VBus and The first test data of the first actual current value I ₁ .

After collecting the first test data, the battery management chip 132 adjusts the charging current, controls charging of the battery 133 with the second charging current, and collects the second actual voltage value V ₂ and the second actual current at the VBus during charging. The second test data of value I ₂ .

It should be noted that the first charging current and the second charging current are different, and the first charging current and the second charging current are both smaller than the rated charging current of the battery 133, and the rated charging current refers to a maximum charging current for charging the battery, for example, When the rated charging current is 1.5A, the first charging current is 0.5A and the second charging current is 0.8A.

Since the power adapter 110 outputs a constant DC voltage, the sum of the voltage shared by the charging line 110 and the actual voltage flowing into the battery management chip 132 remains unchanged during two successive measurements, that is, R × I ₁ + V ₁ = R × I ₂ + V ₂ , where R is the impedance of the charging line 120. According to the above equation, R = (V ₁ - V ₂ ) / (I _{2 -} I ₁ ) can be obtained.

Obviously, the battery management chip 132 can still calculate the impedance of the charging line 120 according to the collected first test data and the second test data without knowing the accurate voltage value output by the power adapter 110, and because of the above formula V ₁ , V ₂ , I ₁ and I ₂ are actual measured values, and therefore, the calculated impedance is more accurate.

After calculating the impedance of the charging line 120, the battery management chip 132 further determines a charging current reduction coefficient according to the impedance, and resets the charging current according to the charging current reduction coefficient and the rated charging current, so that the battery is set according to the set charging current. 133 charging. The correspondence between the impedance and the charging current down-regulation coefficient is pre-stored in the battery management chip 132. The corresponding relationship is shown in Table 1.

Table I

Charging line impedance R Charging current reduction factor R<0.3Ω 1 0.3Ω≤R<0.5Ω 0.7 0.5Ω≤R<1.0Ω 0.5 1.0Ω≤R<3.0Ω 0.3 R≥3.0Ω 0

For example, when the impedance of the charging line is calculated to be 0.2 Ω, the battery management chip 132 charges the battery 133 with the rated charging current; for example, the battery management chip 132 calculates the impedance of the charging line to be 0.45 Ω, and the rated charging current is 1.5. A, the charging current is set to 1.5 × 0.45 = 0.675 A; for another example, when the impedance of the charging line is calculated to be 3.5 Ω, the battery management chip 132 stops charging the battery 133.

In this embodiment, the battery management chip outputs a constant direct current through the D+ or D- indicating power adapter. Pressing, and collecting at least two sets of test data at the VBus by adjusting the charging current, thereby calculating the impedance of the charging line according to the actual voltage value and the actual current value included in the test data, and ensuring the data used when calculating the charging line impedance. Both are actual measured values, which improves the accuracy of the calculated charging line impedance.

Compared to charging the battery according to the rated charging current, it takes a longer time to charge the battery according to the adjusted charging current, and the charging line consumes a large amount of power during charging. Therefore, in order to remind the user to replace the inferior charging line in time and shorten the charging time, optionally, based on the charging system of FIG. 2, the battery management chip 132 in the mobile terminal 130 is also electrically connected to the processor 134. .

After the battery management chip 132 completes the charging current setting, the set charging current is sent to the processor 134. Accordingly, the processor 134 receives the set charging current.

After receiving the set charging current, the processor 134 detects whether the charging current is less than a preset current threshold. When the charging current is less than the preset current threshold, the processor 134 controls the electrically connected display screen (not shown) The display prompt message prompts the user to replace the charging cable.

Optionally, the battery management chip 132 may further send a charging current reduction coefficient to the processor, and the processor 134 determines the corresponding prompt mode according to the charging current reduction coefficient, and then prompts. For example, if the charging current reduction coefficient received by the processor is 0.7, the control display screen displays the text prompt information; for example, if the charging current reduction coefficient received by the processor is 0.3, the control display screen displays the animation prompt information.

In this embodiment, the battery management chip sends the set charging current to the processor, so that the processor can display corresponding prompt information according to the charging current, prompting the user to replace the charging line as soon as possible, and avoiding the power caused by charging the inferior charging line. loss.

When the ambient temperature is high, the heat generated on the charging line is difficult to dissipate, resulting in a faster rise of the charging line temperature. To avoid the above situation, optionally, based on the charging system shown in FIG. 3, as shown in FIG. The temperature sensor 135 is further included in the mobile terminal 130, and the temperature sensor 135 is electrically connected to the processor 134.

In calculating the impedance of the charging line 120, the temperature sensor 135 collects the ambient temperature of the ambient environment, and correspondingly, the processor 134 acquires the ambient temperature from the temperature sensor 135.

After the processor 134 obtains the ambient temperature, detecting whether the ambient temperature is greater than a preset temperature threshold, when When the ambient temperature is greater than the preset temperature threshold, the processor 134 sends a control command to the battery management chip 132 to instruct the battery management chip to down-regulate the set charging current.

For example, when the acquired ambient temperature is above 28 ° C, the processor 134 sends the control command to the battery management chip 132.

Correspondingly, the battery management chip 132 performs down-regulation based on the received charging current based on the set charging current.

Optionally, after receiving the control command, the battery management chip 132 reduces the determined charging current reduction coefficient by one level, and resets the charging current according to the adjusted charging current reduction coefficient.

For example, the battery management chip 132 determines that the charging current reduction coefficient is 0.7 according to the impedance of the charging line 120. When receiving the control command sent by the processor 134, the battery management chip 132 adjusts the charging current reduction coefficient to 0.5.

In this embodiment, when the ambient temperature is high, the processor sends a control command to the battery management chip to instruct the battery management chip to reduce the charging current, thereby reducing the heat generated on the charging line and slowing the rising speed of the charging line temperature.

FIG. 5 shows a flow chart of a charging method provided by an exemplary embodiment. The embodiment of the present disclosure is exemplified by the charging method applied to the mobile terminal 130 shown in FIGS. 1 to 4. The charging method includes:

In step 501, a DC voltage input by the hardware charging interface is received, and the DC voltage is transmitted by the power adapter to the hardware charging interface through the charging line.

In step 502, the impedance of the charging line is calculated based on the actual voltage value of the collected DC voltage and the actual current value.

The battery management chip in the mobile terminal has a voltage and current measurement function. In the process of calculating the impedance of the charging line, the mobile terminal collects the actual voltage value and the actual current value through the battery management chip, and calculates according to the actual voltage value and the actual current value. The impedance of the charging line.

Optionally, the battery management chip collects at least two sets of test data at the VBus, and calculates the impedance of the charging line according to at least two sets of test data, wherein each set of test data includes an actual voltage value and an actual current value at the VBus.

In step 503, the charging current is set according to the impedance of the charging line.

The battery management chip in the mobile terminal has a current adjustment function, and after calculating the impedance of the charging line, the battery management chip accordingly lowers the charging current.

In step 504, the battery is charged according to the set charging current.

Optionally, the battery management chip in the mobile terminal includes a battery charging circuit, and the battery management chip charges the battery through the battery charging current according to the set charging current.

In summary, in this embodiment, the battery management chip inside the mobile terminal collects the actual voltage value and the actual current value of the input DC voltage before charging the battery, and further calculates the charging line according to the actual voltage value and the actual current value. The impedance is thus reset to the charging current of the battery charging according to the impedance, thereby reducing the heat generation of the charging line during charging, and avoiding the use of a poor quality charging line for charging, because the inferior charging line generates a large amount of heat. The safety hazard caused by the safety of the mobile terminal is improved.

FIG. 6 shows a flow chart of a charging method provided by another exemplary embodiment. The embodiment of the present disclosure is exemplified by the charging method applied to the mobile terminal 130 shown in FIGS. 1 to 4. The charging method includes:

In step 601, a test command is sent to the power adapter via D+ or D- upon detecting a connection to the power adapter.

In order to ensure that the DC voltage output from the power adapter remains unchanged during the calculation of the impedance, the battery management chip sends a test command to the power adapter via D+ or D- when it detects a connection with the power adapter, which is used to indicate the power adapter. A DC voltage that outputs a constant voltage value.

Optionally, the test command further includes an output voltage value for indicating a DC voltage output by the power adapter at the output voltage value, wherein the output voltage value is less than or equal to a maximum charging voltage of the mobile terminal.

In step 602, a DC voltage input by the hardware charging interface is received, and the DC voltage is a constant DC voltage output by the power adapter according to the test command.

After receiving the test command, the power adapter converts the AC voltage into a DC voltage of a constant voltage value through an internal voltage conversion chip, and transmits a DC voltage to the mobile terminal through the charging line.

Optionally, while outputting a constant DC voltage, the power adapter sends a feedback command to the mobile terminal through the internal adapter management chip, and the feedback instruction is used to indicate that the DC voltage is being output at a constant voltage value.

Correspondingly, after receiving the feedback instruction, the battery management chip in the mobile terminal receives the DC voltage input by the hardware charging interface.

In step 603, the battery is charged with the first charging current, and the first test data at the VBus is collected. The first test data includes the first actual voltage value V ₁ and the first actual current value I ₁ at the VBus.

After receiving the input constant DC voltage, the battery management chip charges the battery with the first charging current, and collects the first actual voltage value V ₁ and the first actual current value I ₁ at the battery management chip VBus during the charging process. Wherein, the first charging current is less than a rated charging current, and the rated charging current refers to a maximum charging current for charging the battery.

In step 604, the second charging current to charge the battery, and a second test data acquisition VBus at a second test data comprises a second actual voltage value V ₂ and the second actual current value I ₂ VBus at.

After the first test data acquisition is completed, the battery management chip charges the battery with the second charging current, and collects the second actual voltage value V ₂ and the second actual current value I ₂ at the VBus during the charging process. Wherein, the second charging current is the first charging current, and the second charging current is less than the rated charging current.

In step 605, the impedance of the charging line is calculated based on the first test data and the second test data.

Since the power adapter outputs a constant DC voltage, the sum of the voltage shared by the charging line and the actual voltage flowing into the battery management chip remains unchanged during the two measurements, that is, R × I ₁ + V ₁ = R × I ₂ + V ₂ , where R is the impedance of the charging line 120.

According to the above equation, R = (V ₁ - V ₂ ) / (I _{2 -} I ₁ ) can be obtained. Therefore, after measuring two sets of test data, the battery management chip can calculate the impedance of the charging line based on two sets of measurement data. . Since V ₁ , V ₂ , I ₁ and I ₂ are actual measured values in the above formula, the accuracy of the impedance calculated by the above method is high.

In step 606, a charging current down-conversion coefficient is determined based on the impedance of the charging line.

The correspondence between the charging line impedance and the charging current lowering coefficient is stored in advance in the mobile terminal, and the correspondence is schematically shown in Table 1.

After calculating the charging line impedance, the battery management chip determines the charging current reduction coefficient according to the corresponding relationship.

In step 607, the charging current is set according to the charging current down-regulation coefficient and the rated charging current, and the rated charging current refers to the maximum charging current for charging the battery.

After the charging current is down-regulated by the love, the battery management chip further sets the charging current according to the rated charging current of the mobile terminal.

For example, if the battery management chip calculates that the impedance of the charging line is 0.45 Ω and the rated charging current is 1.5 A, the charging current is set to 1.5×0.45=0.675A.

In step 608, the battery is charged according to the set charging current.

After the charging current setting is completed, the battery management chip charges the battery according to the set charging current.

It should be noted that, compared with charging the battery according to the rated charging current, it takes a longer time to charge the battery according to the reduced charging current to charge the battery, and the charging line consumes a large amount of power during charging.

In this embodiment, the battery management chip outputs a constant DC voltage through the D+ or D- indicating power adapter, and collects at least two sets of test data at the VBus by adjusting the charging current, thereby obtaining an actual voltage value according to the test data. The actual current value is calculated to obtain the impedance of the charging line, and the data used to calculate the impedance of the charging line are all actual measured values, which improves the accuracy of the calculated charging line impedance.

In order to make the user know that the currently used charging line is a poor quality charging line, and then replace the inferior charging line in time, based on the charging method shown in FIG. 6, as shown in FIG. 7A, the above step 607 may further include the following steps.

In step 609, the set charging current is sent to the processor, and the processor is configured to control the display screen to display a prompt message when the set charging current is less than the preset current threshold, the prompt information is used to prompt the user to replace the charging line. .

After the battery management chip sets the charging current according to the charging current reduction coefficient, the set charging current is sent to the processor. After receiving the charging current, the processor detects whether the charging current is less than a preset current threshold. When the charging current is less than the preset current threshold, the processor controls the display screen to display a corresponding prompt message, instructing the user to replace the charging line.

For example, as shown in FIG. 7B, when the power adapter 71 is used to charge the mobile terminal 72, the battery management chip in the mobile terminal 72 transmits the set charging current to the processor; the processor detects that the set charging current is less than the pre-charge. The current threshold is set and the display screen 73 is displayed with corresponding prompt information.

Optionally, the battery management chip may further send a charging current reduction coefficient to the processor, and the processor may prompt according to the charging current lowering coefficient to determine a corresponding prompting mode. For example, if the charging current reduction coefficient received by the processor is 0.7, the control display screen displays the text prompt information; for example, if the charging current reduction coefficient received by the processor is 0.3, the control display screen displays the animation prompt information.

In this embodiment, the battery management chip sends the set charging current to the processor, so that the processor can display corresponding prompt information according to the charging current, prompting the user to replace the charging line as soon as possible, and avoiding the power caused by charging the inferior charging line. loss.

When the mobile terminal is the mobile terminal 130 in the charging system shown in FIG. 4, the charging side shown in FIG. On the basis of the method, as shown in FIG. 8, after the above step 607, the following steps are further included:

In step 610, a control command sent by the processor is received, where the control command is sent when the processor detects that the ambient temperature is greater than a preset temperature threshold.

In the process of calculating the impedance of the charging line, the temperature sensor in the mobile terminal collects the ambient temperature of the external environment, and the processor acquires the ambient temperature from the temperature sensor.

Whether the detected ambient temperature obtained by the processor is greater than a preset temperature threshold. When the ambient temperature is greater than the preset temperature threshold, the processor sends a control command to the battery management chip to instruct the battery management chip to lower the set charging current.

For example, when the obtained ambient temperature is higher than 28 ° C, the processor sends the control command to the battery management chip.

In step 611, the set charging current is lowered according to the control command.

Optionally, after receiving the control instruction, the battery management chip reduces the determined charging current reduction coefficient by one level, and resets the charging current according to the adjusted charging current reduction coefficient.

For example, the battery management chip determines that the charging current reduction coefficient is 0.7 according to the impedance of the charging line. When receiving the control command sent by the processor 134, the battery management chip adjusts the charging current reduction coefficient to 0.5.

In this embodiment, when the ambient temperature is high, the processor sends a control command to the battery management chip to instruct the battery management chip to reduce the charging current, thereby reducing the heat generated on the charging line and slowing the rising speed of the charging line temperature.

FIG. 9 is a structural block diagram of a mobile terminal according to an exemplary embodiment. For example, the mobile terminal 900 can be a mobile phone, a computer, a digital broadcast terminal, a messaging device, a game console, a tablet device, a medical device, a fitness device, a personal digital assistant, and the like.

Referring to FIG. 9, the mobile terminal 900 can include one or more of the following components: a processing component 902, a memory 904, a power component 906, a multimedia component 908, an audio component 910, an input/output (I/O) interface 912, a sensor component 914, And a communication component 916.

Processing component 902 typically controls the overall operations of mobile terminal 900, such as operations associated with display, telephone calls, data communications, camera operations, and recording operations. Processing component 902 can include one or more processors 918 to execute instructions to perform all or part of the steps of the above described methods. Moreover, processing component 902 can include one or more modules to facilitate interaction between component 902 and other components. For example, processing component 902 can include a multimedia module to facilitate multimedia component 908 and processing Interaction between components 902.

The memory 904 is configured to store various types of data to support operations at the mobile terminal 900. Examples of such data include instructions for any application or method operating on the mobile terminal 900, contact data, phone book data, messages, pictures, videos, and the like. The memory 904 can be implemented by any type of volatile or non-volatile storage device, or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read only memory (EEPROM), erasable. Programmable Read Only Memory (EPROM), Programmable Read Only Memory (PROM), Read Only Memory (ROM), Magnetic Memory, Flash Memory, Disk or Optical Disk.

Power component 906 provides power to various components of mobile terminal 900. Power component 906 can include a power management system, one or more power sources, and other components associated with generating, managing, and distributing power for mobile terminal 900. In the embodiment of the present disclosure, the power supply component 906 includes a battery management chip, and the charging method of the embodiment of the present disclosure is performed by the battery management chip.

The multimedia component 908 includes a screen that provides an output interface between the mobile terminal 900 and the user. In some embodiments, the screen can include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen can be implemented as a touch screen to receive input signals from the user. The touch panel includes one or more touch sensors to sense touches, slides, and gestures on the touch panel. The touch sensor can sense not only the boundaries of the touch or sliding action, but also the duration and pressure associated with the touch or slide operation. In some embodiments, the multimedia component 908 includes a front camera and/or a rear camera. When the mobile terminal 900 is in an operation mode, such as a shooting mode or a video mode, the front camera and/or the rear camera can receive external multimedia data. Each front and rear camera can be a fixed optical lens system or have focal length and optical zoom capabilities.

The audio component 910 is configured to output and/or input an audio signal. For example, the audio component 910 includes a microphone (MIC) that is configured to receive an external audio signal when the mobile terminal 900 is in an operational mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signal may be further stored in memory 904 or transmitted via communication component 916. In some embodiments, the audio component 910 also includes a speaker for outputting an audio signal.

The I/O interface 912 provides an interface between the processing component 902 and the peripheral interface module, which may be a keyboard, a click wheel, a button, or the like. These buttons may include, but are not limited to, a home button, a volume button, a start button, and a lock button.

Sensor component 914 includes one or more sensors for providing various aspects to mobile terminal 900 State assessment of the face. For example, sensor component 914 can detect an open/closed state of mobile terminal 900, relative positioning of components, such as a display and keypad of mobile terminal 900, and sensor component 914 can also detect a component of mobile terminal 900 or mobile terminal 900. The location changes, the presence or absence of contact of the user with the mobile terminal 900, the orientation or acceleration/deceleration of the mobile terminal 900, and the temperature change of the mobile terminal 900. Sensor assembly 914 can include a proximity sensor configured to detect the presence of nearby objects without any physical contact. Sensor assembly 914 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor component 914 can also include an acceleration sensor, a gyro sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.

Communication component 916 is configured to facilitate wired or wireless communication between mobile terminal 900 and other devices. The mobile terminal 900 can access a wireless network based on a communication standard such as Wi-Fi, 2G or 3G, or a combination thereof. In an exemplary embodiment, communication component 916 receives broadcast signals or broadcast associated information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, communication component 916 also includes a near field communication (NFC) module to facilitate short range communication. For example, the NFC module can be implemented based on radio frequency identification (RFID) technology, infrared data association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology, and other technologies.

In an exemplary embodiment, the mobile terminal 900 may be implemented by one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), A programming gate array (FPGA), controller, microcontroller, microprocessor or other electronic component implementation is used to perform the charging method performed by the processor in the above embodiments.

In an exemplary embodiment, there is also provided a non-transitory computer readable storage medium comprising instructions, such as a memory 904 comprising instructions executable by processor 918 of mobile terminal 900 to perform the processor of the above-described embodiments The charging method performed. For example, the non-transitory computer readable storage medium can be a ROM, a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, and an optical data storage device.

Other embodiments of the present disclosure will be apparent to those skilled in the <RTIgt; The present application is intended to cover any variations, uses, or adaptations of the present disclosure, which are in accordance with the general principles of the disclosure and include common general knowledge or common technical means in the art that are not disclosed in the present disclosure. . The specification and examples are to be regarded as illustrative only,

It is to be understood that the invention is not limited to the details of the details and The scope of the disclosure is to be limited only by the appended claims.

Claims (13)

A mobile terminal, comprising: a hardware charging interface, a battery management chip electrically connected to the hardware charging interface; and a battery electrically connected to the battery management chip; The hardware charging interface is configured to receive a DC voltage transmitted by the power adapter through the charging line; and input the DC voltage to the battery management chip; The battery management chip is configured to calculate an impedance of the charging line according to an actual voltage value and an actual current value of the collected DC voltage; The battery management chip is further configured to set a charging current according to an impedance of the charging line; and charge the battery according to the set charging current. The mobile terminal according to claim 1, wherein the battery management chip is electrically connected to the hardware charging interface through a voltage bus pin VBus and a ground pin GND; The battery management chip is configured to receive the DC voltage input by the hardware charging interface through the VBus; The battery management chip is further configured to collect at least two sets of test data at the VBus, where each set of the test data includes the actual voltage value and the actual current value at the VBus; Two sets of test data calculate the impedance of the charging line. The mobile terminal according to claim 2, wherein the battery management chip is further electrically connected to the hardware charging interface through a data plus pin D+ and a data minus pin D-; The battery management chip is further configured to send a test instruction to the power adapter through the D+ or the D- when detecting a connection with the power adapter, the test command is used to indicate the power adapter a DC voltage that outputs a constant voltage value; The battery management chip is further configured to charge the battery with a first charging current; collect first test data at the VBus, the first test data includes a first actual voltage value V ₁ at the VBus And a first actual current value I ₁ ; The battery management chip is further configured to charge the battery with a second charging current; collect second test data at the VBus, the second test data includes a second actual voltage value V ₂ at the VBus And a second actual current value I ₂ ; The battery management chip is further configured to calculate an impedance of the charging line according to the first test data and the second test data; Wherein the impedance of the charging line=(V ₁ -V ₂ )/(I ₂ -I ₁ ), and the first charging current ≠the second charging current ≤the rated charging current, the rated charging current refers to The maximum charging current for charging the battery. A mobile terminal according to any one of claims 1 to 3, characterized in that The battery management chip is configured to determine a charging current reduction coefficient according to an impedance of the charging line; set the charging current according to the charging current lowering coefficient and a rated charging current, where the rated charging current refers to charging the battery Maximum charging current. The mobile terminal according to any one of claims 1 to 3, wherein the battery management chip is electrically connected to the processor; The battery management chip is configured to send the set charging current to the processor; The processor is configured to: when the set charging current is less than a preset current threshold, control the display screen to display prompt information, where the prompt information is used to prompt the user to replace the charging line. The mobile terminal according to any one of claims 1 to 3, wherein the mobile terminal further comprises a temperature sensor, the temperature sensor is electrically connected to the processor, and the battery control chip and the processor are electrically connected. Connected The processor is configured to acquire an ambient temperature collected by the temperature sensor; when the ambient temperature is greater than a preset temperature threshold, send a control instruction to the battery management chip, where the control instruction is used to indicate a downward adjustment setting The charging current; The battery management chip is further configured to: according to the control instruction, reduce the set charging current. A charging method, characterized in that it is used in a mobile terminal according to any one of claims 1 to 6, the method comprising: Receiving the DC voltage input by the hardware charging interface, where the DC voltage is transmitted by the power adapter to the hardware charging interface through the charging line; Calculating the actual voltage value and the actual current value of the collected DC voltage The impedance of the charging line; Setting the charging current according to an impedance of the charging line; The battery is charged according to the set charging current. The method according to claim 7, wherein the mobile terminal according to claim 2 or 3, wherein the calculating is based on the collected actual voltage value of the DC voltage and the actual current value The impedance of the charging line includes: Collecting at least two sets of test data at the VBus, each set of the test data including the actual voltage value and the actual current value at the VBus; The impedance of the charging line is calculated based on the at least two sets of test data. The method according to claim 8, wherein for the mobile terminal of claim 3, the collecting the at least two sets of test data at the VBus comprises: Sending the test command to the power adapter through the D+ or the D- when detecting a connection with the power adapter; Charging the battery with the first charging current, and collecting the first test data at the VBus, the first test data including the first actual voltage value V ₁ and the location at the VBus Said first actual current value I ₁ ; Charging the battery with the second charging current, and collecting the second test data at the VBus, the second test data including the second actual voltage value V ₂ and the location at the VBus Said second actual current value I ₂ ; Calculating the impedance of the charging line according to the at least two sets of test data, including: Calculating an impedance of the charging line according to the first test data and the second test data; Wherein the impedance of the charging line=(V ₁ -V ₂ )/(I ₂ -I ₁ ), and the first charging current ≠the second charging current ≤the rated charging current, the rated charging current refers to The maximum charging current for charging the battery. The method according to any one of claims 7 to 9, wherein the setting the charging current according to the impedance of the charging line comprises: Determining a charging current down-regulation coefficient according to an impedance of the charging line; Setting the charging current according to the charging current down-regulation coefficient and the rated charging current, the rating The charging current refers to the maximum charging current that charges the battery. The method according to any one of claims 7 to 9, wherein the method further comprises: Sending the set charging current to the processor, the processor is configured to control the display screen to display prompt information when the set charging current is less than a preset current threshold, where the prompt information is used to prompt the user to replace The charging line. The method according to any one of claims 7 to 9, wherein the method further comprises: Receiving a control command sent by the processor, where the control command is sent when the processor detects that the ambient temperature is greater than a preset temperature threshold, and is used to indicate that the charging current after the setting is lowered; The set charging current is lowered according to the control command. A charging system, characterized in that the charging system comprises a power adapter and a mobile terminal; The power adapter and the mobile terminal are connected by a charging line; The mobile terminal comprises the mobile terminal of any one of claims 1 to 6.

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