TWI627815B - Mobile terminal - Google Patents

Abstract

An embodiment of the present invention provides a mobile terminal. The mobile terminal includes: a charging interface. The first charging circuit is connected to the charging interface, and receives an output voltage and an output current of the adapter through a charging interface, and outputs an output voltage and an output of the adapter. The current is directly loaded at both ends of the multi-cells connected in series in the mobile terminal to directly charge the multi-cell cells. The embodiment of the invention can reduce the heat generation of the charging program under the premise of ensuring the charging speed.

Description

Mobile terminal

Embodiments of the present invention relate to the field of electronic devices, and, more particularly, to a mobile terminal.

At present, mobile terminals (such as smart phones) are increasingly favored by consumers, but mobile terminals consume a lot of power and need to be recharged frequently.

In order to increase the charging speed, a feasible solution is to use a large current to charge the mobile terminal. The higher the charging current, the faster the charging speed of the mobile terminal, but the more serious the heating problem of the mobile terminal.

Therefore, under the premise of ensuring the charging speed, how to reduce the heat of the mobile terminal is an urgent problem to be solved.

The embodiment of the invention provides a mobile terminal, which can reduce the heat generation of the mobile terminal under the premise of ensuring the charging speed.

In a first aspect, a mobile terminal is provided, the mobile terminal includes: a charging interface; a first charging circuit, the first charging circuit is connected to the charging interface, and receives an output voltage and an output current of the adapter through the charging interface, and the adapter The output voltage and the output current are directly loaded at both ends of the multi-cells connected in series in the mobile terminal, and the multi-cell is directly charged.

In conjunction with the first aspect, in some implementations of the first aspect, the mobile terminal further includes: a buck circuit, the input end of the buck circuit is connected to both ends of the multi-cell, for the multi-cell the total voltage into a first voltage V _1, wherein a≤V ₁ ≤b, a represents the minimum operating voltage of the mobile terminal, b represents the maximum operating voltage of the mobile terminal; and a power supply circuit, and the output terminal of the step-down circuit Connected to power the mobile terminal based on the first voltage.

In conjunction with the first aspect, in some implementations of the first aspect, the buck circuit is a charge pump, the first voltage being 1/N of a total voltage of the multi-cell, wherein N represents the multi-cell The number of cells included.

In conjunction with the first aspect, in some implementations of the first aspect, the mobile terminal further includes: a power supply circuit, the input end of the power supply circuit is connected to both ends of any single cell of the plurality of cells, the power supply circuit The voltage within the single cell is powered by the device within the mobile terminal.

In conjunction with the first aspect, in some implementations of the first aspect, the mobile terminal further includes: an equalization circuit coupled to the plurality of cells for equalizing between the cells in the plurality of cells Voltage. In conjunction with the first aspect, in some implementations of the first aspect, the output current of the adapter received by the first charging circuit is pulsed direct current or alternating current.

In conjunction with the first aspect, in some implementations of the first aspect, the charging mode of the first charging circuit is a constant current mode.

In conjunction with the first aspect, in some implementations of the first aspect, the mobile terminal further includes: a second charging circuit, the second charging circuit includes a boosting circuit, and the two ends of the boosting circuit are respectively coupled to the charging interface The multi-cell is connected, the boosting circuit receives the output voltage of the adapter through the charging interface, boosts the output voltage of the adapter to a second voltage, and loads the second voltage on both ends of the multi-cell. The plurality of cells are charged, wherein an output voltage of the adapter received by the second charging circuit is less than a total voltage of the plurality of cells, and the second voltage is greater than a total voltage of the plurality of cells.

In conjunction with the first aspect, in some implementations of the first aspect, the output voltage of the adapter received by the second charging circuit is 5V.

With reference to the first aspect, in some implementations of the first aspect, the charging mode corresponding to the first charging circuit is a fast charging mode, and the charging mode corresponding to the second charging circuit is a normal charging mode, and charging in the fast charging mode The speed is greater than the charging speed of the normal charging mode.

For example, the charging current of the fast charging mode is greater than the charging current of the normal charging mode.

In conjunction with the first aspect, in some implementations of the first aspect, the charging interface includes a data line, the mobile terminal further includes a control unit, and the control unit performs bidirectional communication with the adapter through the data line to control the multi-section power Core charging procedure.

In conjunction with the first aspect, in some implementations of the first aspect, the control unit performs bidirectional communication with the adapter through the data line to control a charging procedure of the multi-cell battery, including: the control unit is bidirectional with the adapter Communicating to determine a charging mode; in the case of determining to charge the mobile terminal using the fast charging mode, the control unit controls the adapter to charge the multi-cell by the first charging circuit; determining to use the normal charging mode for the action In the case of charging the terminal, the control unit controls the adapter to charge the multi-cell by the second charging circuit.

In conjunction with the first aspect, in some implementations of the first aspect, the control unit performs bidirectional communication with the adapter to determine a charging mode, including: the control unit receives a first instruction sent by the adapter, and the first instruction is used by the control unit Inquiring whether the mobile terminal activates the fast charging mode; the control unit sends a reply command of the first instruction to the adapter, where the reply command of the first instruction is used to indicate that the mobile terminal agrees to enable the fast charging mode.

In conjunction with the first aspect, in some implementations of the first aspect, the control unit performs bidirectional communication with the adapter through the data line to control a charging procedure of the multi-cell battery, including: the control unit is bidirectional with the adapter Communication to determine the charging voltage for this fast charging mode.

In conjunction with the first aspect, in some implementations of the first aspect, the control unit performs bidirectional communication with the adapter to determine a charging voltage of the fast charging mode, including: the control unit receives a second instruction sent by the adapter, The second instruction is used to query whether the current voltage output by the adapter is suitable as the charging voltage of the fast charging mode; the control unit sends a reply instruction of the second instruction to the adapter, and the reply instruction of the second instruction is used to indicate The current voltage is suitable, high or low.

In conjunction with the first aspect, in some implementations of the first aspect, the control unit performs bidirectional communication with the adapter through the data line to control a charging procedure of the multi-cell battery, including: the control unit is bidirectional with the adapter Communication to determine the charging current for this fast charging mode.

In combination with the first aspect, in some implementations of the first aspect, the control unit performs bidirectional communication with the adapter to determine a charging current of the fast charging mode, including: the control unit receives a third instruction sent by the adapter, The third instruction is used to query the maximum charging current currently supported by the mobile terminal; the control unit sends a reply command of the third instruction to the adapter, and the reply instruction of the third instruction is used to indicate the maximum charging currently supported by the mobile terminal. The current is such that the adapter determines the charging current for the fast charging mode based on the maximum charging current currently supported by the mobile terminal.

In conjunction with the first aspect, in some implementations of the first aspect, the control unit performs bidirectional communication with the adapter through the data line to control a charging procedure of the multi-cell battery, including: charging using the fast charging mode In the program, the control unit communicates bidirectionally with the adapter to adjust the output current of the adapter.

In conjunction with the first aspect, in some implementations of the first aspect, the control unit performs bidirectional communication with the adapter to adjust an output current of the adapter, including: the control unit receives a fourth command sent by the adapter, the The fourth instruction is used to query the current voltage of the multi-cell; the control unit sends a reply instruction of the fourth instruction to the adapter, and the reply instruction of the fourth instruction is used to indicate the current voltage of the multi-cell, so that the adapter is based on The current voltage of the multi-cell is adjusted to adjust the charging current of the adapter.

In the embodiment of the present invention, a plurality of cells are directly charged by the first charging circuit, and the battery structure inside the mobile terminal is modified on the basis of the direct charging scheme, and a plurality of cells connected in series with each other are introduced. Compared with the core scheme, if the same charging speed is to be achieved, the charging current required for the multi-cell cell is 1/N of the charging current required for a single cell (N is the number of cells connected in series in the mobile terminal), In other words, compared with the single-cell solution, the present application can greatly reduce the charging current under the premise of ensuring the same charging speed, thereby reducing the heat generation of the mobile terminal in the charging process.

The technical solutions in the embodiments of the present invention will be clearly and completely described in the following with reference to the accompanying drawings.

In the prior art, the mobile terminal usually only includes a single cell, and when a large charging current is used to charge the single cell, the heating of the mobile terminal is very serious. In order to ensure the charging speed of the mobile terminal and to alleviate the heating phenomenon of the mobile terminal in the charging process, the embodiment of the present invention remodels the battery structure in the mobile terminal, introduces a plurality of electric cells connected in series, and performs the multi-section battery Direct charging, the embodiment of the present invention will be described in detail below with reference to FIG.

Fig. 1 is a schematic structural diagram of a mobile terminal according to an embodiment of the present invention. The mobile terminal 10 of FIG. 1 includes: a charging interface 11; a first charging circuit 12, the first charging circuit 12 is connected to the charging interface 11, receives the output voltage and output current of the adapter through the charging interface 11, and outputs the output voltage of the adapter. The output current is directly loaded at both ends of the multi-cell 13 in series with each other in the mobile terminal, and the multi-cell 13 is directly charged.

In the prior art, the output voltage and output current of the adapter are not directly loaded at the two ends of the cell, but the conversion voltage and output current of the adapter are first converted through some conversion circuit, and then the converted voltage and current are loaded. Enter the two ends of the battery to charge the battery. For example, the output voltage of the adapter is generally 5V. After receiving the 5V output voltage of the adapter, the mobile terminal first uses the Buck circuit to perform the step-down conversion, or uses the Boost circuit to perform the step-up conversion, and then loads the converted voltage into the Both ends of the cell.

The use of the conversion circuit may cause serious heat generation in the mobile terminal, and the use of the conversion circuit may also cause loss of power output by the adapter. In order to solve the heat generation problem caused by the conversion circuit and reduce the loss of the electric energy, the embodiment of the present invention charges the multi-section battery 13 in a direct charge manner through the first charging circuit 12.

Specifically, the direct charging may mean that the output voltage and the output current of the adapter are directly loaded (or directly guided) to both ends of the multi-cell 13 to charge the multi-cell 13 without the output current of the adapter to the adapter. Or the output voltage is transformed to avoid the energy loss caused by the conversion program. In the process of charging using the first charging circuit 12, in order to be able to adjust the charging voltage or charging current on the first charging circuit 12, the adapter can be designed as a smart adapter, and the charging voltage or charging current conversion circuit can be transferred to Inside the adapter, the adapter completes the conversion of the charging voltage or the charging current, which reduces the burden on the mobile terminal and simplifies the implementation of the mobile terminal.

The direct charging scheme can reduce the heat generation of the mobile terminal to a certain extent. However, when the output current of the adapter is too large, if the output current of the adapter reaches 5A-10A, the heating phenomenon of the mobile terminal will still be serious, and thus safety may occur. Hidden dangers. In order to ensure the charging speed and further alleviate the heating phenomenon of the mobile terminal, the embodiment of the present invention further remodels the battery structure inside the mobile terminal, and introduces a plurality of electric cells connected in series, compared with the single battery solution, if To achieve the same charging speed, the charging current required for the multi-cell is 1/N of the charging current required for a single cell (N is the number of cells connected in series in the mobile terminal), in other words, the same is guaranteed. Under the premise of the charging speed, the embodiment of the invention can greatly reduce the magnitude of the charging current, thereby further reducing the heat generation of the mobile terminal in the charging procedure.

For example, for a single cell of 3000mAh, to achieve a charging rate of 3C, a charging current of 9A is required. In order to achieve the same charging speed and reduce the heat generation of the mobile terminal in the charging process, two 1500mAh electric power can be used. The cores are connected in series to replace the single-cell battery of 3000mAh. In this way, only a charging current of 4.5A is required to achieve a charging rate of 3C, and the charging current caused by the charging current of 4.5A is significantly higher than that of the charging current of 9A. Lower.

It should be noted that, since the first charging circuit 12 charges the multi-cell 13 in the direct charging mode, the output voltage of the adapter received by the first charging circuit 12 needs to be greater than the total voltage of the multi-cell 13; generally, a single power The working voltage of the core is between 3.0V and 4.35V. Taking the dual cell series as an example, the output voltage of the adapter can be set to be greater than or equal to 10V.

It should be noted that the type of the charging interface 11 is not specifically limited in the embodiment of the present invention. For example, it may be a Universal Serial Bus (USB) interface and a TYPE-C interface. The USB interface can be either a normal USB interface or a micro USB interface. The first charging circuit 12 can charge the multi-cell 13 through a power line in the USB interface, wherein the power line in the USB interface can be a VBus line and/or a ground line in the USB interface.

The type of the mobile terminal is not specifically limited in the embodiment of the present invention, and may be, for example, a mobile phone or a pad.

The multi-cell 13 in the embodiment of the present invention may be a battery with the same specifications or similar parameters, and the batteries with the same or similar specifications are convenient for unified management, and the batteries with the same specifications or similar parameters can be selected to improve the multi-cell 13 Overall performance and longevity.

It should be understood that the multi-section cells 13 connected in series can divide the output voltage of the adapter.

At present, the mobile terminal (or the device in the mobile terminal or the chip in the mobile terminal) is powered by a single battery. The embodiment of the present invention introduces a plurality of cells connected in series with each other, and the total voltage of the multi-cell is high, which is not suitable for direct Used to power mobile terminals (or devices within mobile terminals, or wafers within mobile terminals). In order to solve this problem, a feasible implementation method is to adjust the working voltage of the mobile terminal (or the device in the mobile terminal or the chip in the mobile terminal) to support multi-cell power supply, but this implementation is actionable. The changes in the terminal are large and the cost is high. In the following, in conjunction with FIG. 2 and FIG. 3, an implementation according to an embodiment of the present invention will be described in detail to solve the problem of how to supply power under the multi-cell battery scheme.

Optionally, in some embodiments, as shown in FIG. 2, the mobile terminal 10 may further include: a step-down circuit 21, and an input end of the step-down circuit 21 is connected to both ends of the multi-section battery core 13 for total voltage power-saving core 13 into a first voltage V _1, wherein a≤V ₁ ≤b, a representation (10 wafers in the apparatus, or mobile terminals within the terminal 10 or mobile) terminal 10 action minimum operating voltage, b The maximum operating voltage of the mobile terminal 10 (or the device in the mobile terminal 10 or the chip in the mobile terminal 10) is indicated; the power supply circuit 22 is connected to the output of the step-down circuit 21 to supply power to the mobile terminal 10 based on the first voltage.

The embodiment of the present invention introduces the step-down circuit 21 on the basis of the embodiment described in FIG. 1 . When the mobile terminal is in the working state, the total voltage of the multi-cell 13 is first stepped down by the step-down circuit 31 to obtain the first The voltage, because the first voltage is between the minimum operating voltage and the maximum operating voltage of the mobile terminal 10, can be directly used to power the mobile terminal, and solves the problem of how to supply power under the multi-cell battery scheme.

It should be noted that the total voltage of the multi-cell 13 is changed according to the change of the electric quantity of the multi-cell 13 . Therefore, the total voltage of the multi-cell 13 above may refer to the current total voltage of the multi-cell 13 . . For example, the operating voltage of a single cell can be between 3.0V and 4.35V. Assuming that the multi-cell includes two cells and the current voltage of the two cells is 3.5V, the total voltage of the multi-cell 13 above. It is 7V.

For example, the operating voltage of a single cell is in the range of 3.0V-4.35V, then a=3.0V, b=4.35V. In order to ensure that the power supply voltage of the device in the mobile terminal is normal, the buck circuit 21 can be more The total voltage of the battery cells 13 drops to any value in the range of 3.0V - 4.35V. The step-down circuit 21 can be implemented in various ways, for example, a Buck circuit, a charge pump, or the like can be used to implement the step-down.

It should be noted that the buck circuit 21 can be a charge pump, and the total voltage of the multi-cell 13 can be directly reduced to 1/N of the current total voltage by the charge pump, where N represents the multi-cell 13 The number of batteries. The conventional Buck circuit includes a switch tube and an inductor, and the loss of the inductor is relatively large. Therefore, the step-down of the Buck circuit causes the power loss of the multi-cell 13 to be relatively large. Compared with the Buck circuit, the charge pump is mainly utilized. The switch tube and the capacitor are stepped down, and the capacitor basically does not consume extra energy. Therefore, the charge pump can reduce the circuit loss caused by the buck program. Specifically, the switching tube inside the charge pump controls the charging and discharging of the capacitor in a manner such that the input voltage is reduced by a factor (the factor selected in the embodiment of the present invention is 1/N), thereby obtaining the required voltage.

Optionally, in other embodiments, as shown in FIG. 3a, the mobile terminal 10 may further include: a power supply circuit 32, and the input end of the power supply circuit 32 is connected to both ends of any single cell in the multi-section battery 13 The power supply circuit 32 supplies power to the devices in the mobile terminal 10 based on the voltage of the single cell 13.

It should be understood that the voltage after the step-down circuit is stepped down may cause ripple, thereby affecting the power quality of the mobile terminal. In the embodiment of the present invention, the power supply voltage is directly drawn from both ends of a single cell in the multi-section cell. The power supply of the mobile terminal is stable. Therefore, the embodiment of the present invention can maintain the power supply quality of the mobile terminal while solving the problem of how to supply power under the multi-cell battery scheme.

Further, on the basis of the embodiment of FIG. 3a, as shown in FIG. 3b, the mobile terminal 10 may further include an equalization circuit 33 connected to the multi-section battery 13 for equalizing each of the plurality of cells 13 The voltage between the cells.

After adopting the power supply mode shown in Figure 3a, the cells that supply power to the devices in the mobile terminal (hereinafter referred to as the main battery, the remaining batteries are called slave cells) will continue to consume power, resulting in the main battery and the secondary battery. The voltage imbalance between the voltages (or the voltage inconsistency), the voltage imbalance between the multi-cells 13 will reduce the overall performance of the multi-cell 13 and affect the service life of the multi-cell 13 and, between the multi-cells 13 The voltage imbalance may cause the multi-cell 13 to be more difficult to manage uniformly. Therefore, the embodiment of the present invention introduces the equalization circuit 33 to balance the voltage between the cells in the multi-cell 13 to improve the overall performance of the multi-cell 13 It is convenient for unified management of multi-cell batteries 13.

The equalization circuit 33 is implemented in many ways. For example, the load can be connected from both ends of the cell, and the amount of electricity from the cell is consumed to be consistent with the amount of the main cell, so that the voltage of the main cell and the cell are maintained. Consistent. Alternatively, it is possible to charge the cell from the cell until the voltage of the main cell and the cell coincide.

As the output power of the adapter becomes larger, when the adapter charges the battery cells in the mobile terminal, it is easy to cause lithium deposition of the battery core, thereby reducing the service life of the battery core.

In order to improve the reliability and safety of the battery, in some embodiments, the adapter output pulsating direct current (or unidirectional pulsating output current, or pulsating waveform current, or 馒 head wave current) may be controlled, due to the first The charging circuit 12 adopts a direct charging mode, and the pulsating direct current outputted by the adapter can be directly loaded into the two ends of the multi-section battery 13. As shown in Fig. 4, the current of the pulsating direct current is periodically changed, and the pulsating direct current is compared with the constant current. It can reduce the lithium deposition phenomenon of lithium batteries and improve the service life of batteries. In addition, the pulsating direct current can reduce the probability and intensity of the arcing of the contacts of the charging interface compared to the constant current, and improve the life of the charging interface.

There are various ways to set the output current of the adapter to pulsating DC. For example, the secondary filter circuit in the adapter can be removed, and the output current of the secondary rectifier circuit (the output current of the rectifier circuit is pulsating DC) is used as the adapter. Output current.

Similarly, in some embodiments, the output voltage of the adapter received by the first charging circuit 12 is the voltage of the pulsating waveform, and the voltage of the pulsating waveform may also be referred to as a unidirectional pulsating output voltage, or a head wave voltage.

Optionally, in some embodiments, the output current of the adapter received by the first charging circuit 12 may also be an alternating current (for example, the adapter does not need to perform rectification and filtering, and the utility power is directly stepped down and output), and the alternating current can also be reduced. The lithium extraction phenomenon of the lithium battery core improves the service life of the battery core.

Optionally, in some embodiments, the charging mode of the first charging circuit 12 is a constant current mode. It should be understood that the constant current mode means that the charging current is kept constant for a period of time, and does not mean that the charging current is always kept constant. In practice, in the constant current mode, the first charging circuit 12 can instantly adjust according to the current voltage of the plurality of cells. The charging current corresponding to the flow mode realizes a piecewise constant current. Further, if the output current of the adapter received by the first charging circuit 12 is pulsating direct current, the charging mode of the first charging circuit 12 is a constant current mode, which may mean that the peak value of the pulsating direct current or the average value of the pulsating direct current remains constant for a period of time. If the output current of the adapter received by the first charging circuit 12 is alternating current, the charging mode of the first charging circuit 12 is a constant current mode, which may mean that the peak or average value of the forward current of the alternating current remains constant for a period of time.

Optionally, in some embodiments, as shown in FIG. 5, the multi-cell batteries 13 may be collectively packaged in one battery 51. Further, the battery 51 may further include a battery protection board 52, which may be through the battery protection board 52. Realize overvoltage and overcurrent protection, battery balance management, and power management.

Optionally, in some embodiments, as shown in FIG. 6, the mobile terminal 10 may further include: a second charging circuit 61, the second charging circuit 61 includes a boosting circuit 62, and the two ends of the boosting circuit 62 are respectively The charging interface 11 is connected to the multi-cell 13 and the boosting circuit 62 receives the output voltage of the adapter through the charging interface 11, boosts the output voltage of the adapter to the second voltage, and loads the second voltage into the two cells 13 And charging the multi-cell, wherein the output voltage of the adapter received by the second charging circuit 61 is less than the total voltage of the multi-cell, and the second voltage is greater than the total voltage of the multi-cell 13.

As can be seen from the above, the first charging circuit 12 directly charges the multi-cell 13 , which requires the output voltage of the adapter to be higher than the total voltage of the multi-cell 13 , for example, for a scheme in which two cells are connected in series, Assuming that the current voltage of each cell is 4V, when the first charging circuit 12 is used to charge the two cells, the output voltage of the adapter is required to be at least 8V. However, the output voltage of the common adapter is generally 5V, and the normal adapter cannot pass the first. A charging circuit 12 charges the plurality of cells 13 in order to be compatible with the charging mode provided by the conventional adapter. The embodiment of the present invention introduces a second charging circuit 61. The second charging circuit 61 includes a boosting circuit, and the boosting circuit can be an adapter. The output voltage is raised to the second voltage to be greater than the total voltage of the multi-cell cells 13, thereby solving the problem that the conventional adapter cannot charge the multi-cell cells 13 connected in series.

It should be noted that, in the embodiment of the present invention, the voltage value of the output voltage of the adapter received by the second charging circuit 61 is not specifically limited. As long as the output voltage of the adapter is lower than the total voltage of the multi-cell 13 , the second charging can be performed. After the circuit 61 is boosted, the multi-cell 13 is charged.

It should be noted that the specific form of the booster circuit is not limited in the embodiment of the present invention. For example, a boost boost circuit may be used, and a charge pump may be used for boosting. Optionally, in some embodiments, the second charging circuit 61 can adopt a conventional charging circuit design, that is, a charging management chip is disposed between the charging interface and the battery core, and the charging management chip can perform constant charging on the charging program. Constant current control, and adjusting the output voltage of the adapter according to actual needs, such as step-up or step-down, the embodiment of the present invention can utilize the boost function of the charge management chip to boost the output voltage of the adapter to be higher than the multi-cell The second voltage of the total voltage of 13. It should be understood that the switching between the first charging circuit 12 and the second charging circuit 61 can be implemented by a switch or a control unit, for example, a control unit is provided inside the mobile terminal, and the control unit can be based on actual needs (such as the type of the adapter). The first charging circuit 12 and the second charging circuit 61 are flexibly switched.

Optionally, in some embodiments, the charging mode corresponding to the first charging circuit 12 may be referred to as a fast charging mode, the charging mode corresponding to the second charging circuit 61 may be referred to as a normal charging mode, and the charging speed of the fast charging mode is greater than a normal charging mode. The charging speed of the charging mode, such as the charging current of the fast charging mode, is greater than the charging current of the normal charging mode. For example, the normal charging mode can be understood as a charging mode with a rated output voltage of 5V and a rated output current of 2.5A or less; the fast charging mode can be understood as a high current charging mode, and the charging current of the fast charging mode can be higher than 2.5A, for example It can reach 5-10A, and the fast charging mode uses the direct charging mode, which directly loads the adapter's output voltage and output current to both ends of the cell.

Further, as shown in FIG. 7, the charging interface 11 may include a data line, and the mobile terminal 10 further includes a control unit 71. The control unit 71 can perform bidirectional communication with the adapter through the data line to control the charging procedure of the multi-cell 13. Taking the charging interface as a USB interface as an example, the data line can be a D+ line and/or a D- line in the USB interface.

The embodiment of the present invention does not specifically limit the communication content of the control unit 71 and the adapter, and the control method of the charging program of the multi-cell 13 by the control unit. For example, the control unit 71 can communicate with the adapter to interact with the current voltage of the multi-cell 13 Or the current power, to control the adapter to adjust the output voltage or the output current; for example, the control unit 71 can communicate with the adapter to interact with the current state of the mobile terminal to negotiate which of the first charging circuit 12 and the second charging circuit 61 to charge. The circuit is charged. The communication content between the control unit 71 and the adapter and the control method of the charging program by the control unit 71 will be described in detail below in conjunction with a specific embodiment.

Optionally, in some embodiments, the control unit 71 performs bidirectional communication with the adapter through the data line to control the charging procedure of the multi-cell 13 to include: the control unit 71 performs bidirectional communication with the adapter to determine a charging mode; In the case of charging the mobile terminal using the fast charging mode, the control unit 71 controls the adapter to charge the multi-cell 13 through the first charging circuit 12; in the case of determining to charge the mobile terminal using the normal charging mode, the control unit 71 controls the adapter to pass The second charging circuit 61 charges the multi-cell 13 .

In the embodiment of the present invention, the mobile terminal does not blindly charge the first charging circuit, but performs bidirectional communication with the adapter to negotiate whether the fast charging mode can be adopted, which can improve the security of the fast charging procedure.

Specifically, the control unit 71 performs bidirectional communication with the adapter to determine the charging mode, which may include: the control unit 71 receives a first instruction sent by the adapter, the first instruction is used to query whether the mobile terminal turns on the fast charging mode; and the control unit 71 sends the adapter to the adapter. The reply instruction of the first instruction, the reply instruction of the first instruction is used to instruct the mobile terminal to agree to enable the fast charging mode.

Optionally, in some embodiments, the control unit 71 performs bidirectional communication with the adapter through the data line to control the charging procedure of the multi-cell 13 to include: the control unit 71 performs bidirectional communication with the adapter to determine the charging in the fast charging mode. Voltage.

Specifically, the control unit 71 performs bidirectional communication with the adapter to determine the charging voltage of the fast charging mode, which may include: the control unit 71 receives the second instruction sent by the adapter, and the second instruction is used to query the current voltage output by the adapter as the fast charging mode. Whether the charging voltage is suitable; the control unit 71 sends a reply instruction of the second instruction to the adapter, and the reply instruction of the second instruction is used to indicate that the current voltage is suitable, high or low. Optionally, the second instruction is used to query whether the current voltage output by the adapter matches the current voltage of the multi-cell 13 , and the reply command of the second instruction indicates that the current voltage output by the adapter matches the current voltage of the multi-cell 13 , and is high. Or low.

Optionally, in some embodiments, the control unit 71 performs bidirectional communication with the adapter through the data line to control the charging procedure of the multi-cell 13 to include: the control unit 71 performs bidirectional communication with the adapter to determine the charging in the fast charging mode. Current.

Specifically, the control unit 71 performs bidirectional communication with the adapter to determine the charging current of the fast charging mode, and the control unit 71 receives the third command sent by the adapter, where the third command is used to query the maximum charging current currently supported by the mobile terminal; The unit 71 sends a reply command of the third instruction to the adapter, and the reply command of the third instruction is used to indicate the maximum charging current currently supported by the mobile terminal, so that the adapter determines the charging current of the fast charging mode based on the maximum charging current currently supported by the mobile terminal. The adapter can determine the maximum charging current currently supported by the mobile terminal as the charging current of the fast charging mode, and can also determine the charging current of the fast charging mode after considering factors such as the maximum charging current currently supported by the mobile terminal and its own current output capability.

Optionally, in some embodiments, the control unit 71 performs bidirectional communication with the adapter through the data line to control the charging procedure of the multi-cell 13 to include: in the process of charging using the fast charging mode, the control unit 71 and the adapter perform Two-way communication to adjust the output current of the adapter.

Specifically, the two-way communication between the control unit 71 and the adapter to adjust the output current of the adapter may include: the control unit 71 receives the fourth command sent by the adapter, and the fourth command is used to query the current voltage of the multi-cell 13; the control unit 71 The adapter sends a reply command of the fourth command, and the reply command of the fourth command is used to indicate the current voltage of the multi-cell 13 so that the adapter adjusts the charging current output by the adapter according to the current voltage of the multi-cell 13.

Optionally, as an embodiment, the control unit 71 sends a reply instruction of the fourth instruction to the adapter, where the reply instruction of the fourth instruction is used to indicate the current voltage of the multi-section battery 13 so that the adapter according to the current voltage of the multi-section battery 13 Adjusting the charging current output by the adapter may include: the control unit 71 receives a fourth command sent by the adapter, the fourth command is used to query the current voltage of the multi-cell 13; the control unit 71 sends a reply command of the fourth command to the adapter, the fourth command The reply command is used to indicate the current voltage of the multi-cell 13 so that the adapter continuously adjusts the output current of the adapter according to the current voltage of the multi-cell 13.

Alternatively, as an embodiment, in the program in which the adapter charges the multi-cell 13 using the fast charging mode, the control unit 71 performs bidirectional communication with the adapter so that the adapter determines whether the charging interface is in poor contact.

Optionally, as an embodiment, the control unit 71 performs bidirectional communication with the adapter, so that the adapter determines whether the charging interface is in poor contact. The control unit 71 receives the fourth command sent by the adapter, and the fourth command is used to query the multi-cell 13 The current voltage; the control unit 71 sends a reply command of the fourth command to the adapter, and the reply command of the fourth command is used to indicate the current voltage of the multi-cell 13 so that the adapter according to the output voltage of the adapter and the current voltage of the multi-cell 13 It is determined whether the charging interface 11 is in poor contact.

Optionally, as an embodiment, the control unit 71 is further configured to receive a fifth instruction sent by the adapter, where the fifth instruction is used to indicate that the charging interface 11 is in poor contact.

The communication procedure between the mobile terminal and the adapter will be described in more detail below with reference to specific examples. It should be noted that the example of FIG. 8 is only intended to assist those skilled in the art to understand the embodiments of the present invention, and the embodiments of the present invention are not limited to the specific numerical values or specific examples illustrated. A person skilled in the art will be able to make various modifications or changes in the embodiments according to the example of FIG. 8 which are within the scope of the embodiments of the present invention.

As shown in Fig. 8, the fast charging program can include five phases: Phase 1: After the control unit 71 is connected to the power supply device, the mobile terminal can detect the type of the power supply device through the data lines D+, D-, when the power is detected. When the device is provided as an adapter, the current absorbed by the mobile terminal may be greater than a preset current threshold I2 (eg, may be 1A). When the adapter detects that the output current of the adapter is greater than or equal to I2 within a preset duration (for example, may be continuous T1 time), the adapter may consider that the type identification of the power supply device by the mobile terminal has been completed, and the adapter opens the adapter and the control unit. The handshake communication between 71 sends an instruction 1 (corresponding to the first instruction described above) to the control unit 71 to inquire whether the control unit 71 turns on the fast charging mode (or referred to as a flash charging mode).

When the adapter receives the reply command of the instruction 1 sent by the control unit 71, and the reply command of the command 1 indicates that the control unit 71 does not agree to turn on the fast charge mode, the adapter detects its own output current again, when the output current of the adapter is preset. When the continuous duration (for example, may be continuous T1 time) is still greater than or equal to I2, the command 1 is again sent to the control unit 71, inquiring whether the control unit 71 turns on the fast charge mode. The adapter repeats the above steps of Phase 1 until the control unit 71 agrees to turn on the fast charge mode, or the output current of the adapter no longer satisfies the condition of greater than or equal to I2.

When the control unit 71 agrees to turn on the fast charging mode, the fast charging and charging process is turned on, and the fast charging communication process enters the second stage. Stage 2:

The output voltage of the adapter may include a plurality of gears, and the adapter sends an instruction 2 (corresponding to the second command described above) to the control unit 71 to inquire whether the current voltage output by the adapter is suitable as the charging voltage of the fast charging mode (or, the instruction 2 interrogates) Whether the current voltage output by the adapter matches the current voltage of the multi-cell 13).

The control unit 71 sends a reply command of the instruction 2 to the adapter to indicate that the current voltage output by the adapter is suitable, high or low. If the reply command of the instruction 2 indicates that the current voltage of the adapter output is high or low, the adapter can The current voltage of the output is adjusted by one bit position, and the command 2 is sent again to the control unit 71, and it is re-queried whether the current voltage output by the adapter is suitable as the charging voltage of the fast charging mode. The above steps of phase 2 are repeated until control unit 71 determines that the current voltage output by the adapter is suitable as the charging voltage for the fast charging mode, entering phase 3. Stage 3:

The adapter sends an instruction 3 (corresponding to the third instruction) to the control unit 71, inquires about the maximum charging current currently supported by the control unit 71, and the control unit 71 sends a reply command of the instruction 3 to the adapter to indicate the maximum charging current currently supported by the mobile terminal. And enter the fourth stage. Stage 4:

The adapter determines the charging current for the fast charging mode based on the maximum charging current currently supported by the mobile terminal, and then enters phase 5, the constant current phase. Stage 5:

After entering the constant current phase, the adapter sends an instruction 4 (corresponding to the fourth instruction described above) to the control unit 71 every time interval, inquiring about the current voltage of the multi-cell 13, and the control unit 71 can send a reply instruction of the instruction 4 to the adapter. In order to feed back the current voltage of the multi-cell 13 , the adapter can judge whether the contact of the charging interface is good according to the current voltage of the multi-cell 13 and whether it is necessary to reduce the output current of the adapter. When the adapter determines that the charging interface is in poor contact, the command 5 (corresponding to the fifth command described above) may be sent to the control unit 71, and then reset to re-enter the phase 1.

Optionally, in some embodiments, when the control unit 71 sends the reply instruction of the instruction 1 in the phase 1, the reply command of the instruction 1 may carry the data (or information) of the path impedance of the mobile terminal, and the mobile terminal The path impedance data can be used to determine if the contact of the charging interface is good at stage 5.

Optionally, in some embodiments, in phase 2, the time elapsed from the mobile terminal agreeing to activate the fast charging mode until the adapter adjusts the output voltage to the appropriate voltage may be controlled within a certain range if the time exceeds a predetermined time For the range, the control unit 71 can determine that the fast charge communication program is abnormal and reset to re-enter phase 1.

Optionally, in some embodiments, in phase 2, when the current voltage output by the adapter is higher than the current voltage of the multi-cell 13 by ΔV (ΔV may be set to 200-500 mV), the control unit 71 sends an instruction 2 to the adapter. The reply command is to indicate that the current voltage of the adapter output is appropriate.

Optionally, in some embodiments, in stage 4, the adjustment speed of the output current of the adapter may be controlled within a certain range, so that the charging procedure abnormality of the first charging circuit 12 due to the excessive adjustment speed may be avoided.

Alternatively, in some embodiments, in stage 5, the magnitude of the change in the output current of the adapter can be controlled to within 5%.

Optionally, in some embodiments, in the phase 5, the adapter can monitor the path impedance of the first charging circuit 12 in real time. Specifically, the adapter can be based on the output voltage of the adapter, the output current, and the multi-cell battery fed back by the control unit 71. The current voltage of 13 monitors the path impedance of the first charging circuit 12. When the path impedance of the first charging circuit 12 > the path impedance of the mobile terminal + the impedance of the charging cable, the charging interface is considered to be in poor contact, and charging using the first charging circuit 12 is stopped.

Optionally, in some embodiments, after the fast charging mode is turned on, the communication time interval between the adapter and the control unit 71 can be controlled within a certain range, and the communication interval is too short to cause the fast charging communication program to be abnormal.

Alternatively, in some embodiments, the stop of the fast charge program (or the stop of the fast charge mode) may be divided into two types: a recoverable stop and an unrecoverable stop: for example, when detecting that the multi-cell 13 is full or charged When the interface is in poor contact, the fast charge program stops, the fast charge communication program is reset, and the operation terminal re-enters the stage 1. The mobile terminal does not agree to turn on the fast charge mode, and the fast charge communication process does not enter the stage 2, and the fast charge program stops in this case. Can be considered an unrecoverable stop.

For another example, when a communication abnormality occurs between the control unit 71 and the adapter, the fast charge program stops, the fast charge communication program is reset, and the process 1 is re-entered. After the requirement of the phase 1 is satisfied, the control unit 71 agrees to turn on the fast charge mode. The fast charge program is resumed, and the stop of the fast charge program in this case can be regarded as a recoverable stop.

For another example, when the control unit 71 detects that an abnormality occurs in one of the plurality of cells 13 , the fast charge program stops, the fast charge communication program is reset, and the phase 1 is re-entered, and the control unit 71 does not agree to turn on the fast charge mode. When the multi-cell 13 is restored to normal and the requirements of the phase 1 are met, the control unit 71 agrees to turn on the fast charging mode, and the stop of the fast charging procedure in this case can be regarded as a recoverable stop.

Specifically, the communication step or operation shown in FIG. 8 above is only an example. For example, in the phase 1, after the mobile terminal is connected to the adapter, the handshake communication between the control unit 71 and the adapter may also be It is initiated by the control unit 71, that is, the control unit 71 sends an instruction 1 to inquire whether the adapter turns on the fast charging mode, and when the control unit 71 receives the reply command of the adapter to instruct the adapter to agree to turn on the fast charging mode, the multi-section cell is passed through the first charging circuit 12. 13 charging.

It should be noted that the communication step or operation shown in FIG. 8 above is only an example. For example, after the phase 5, a constant voltage charging phase may be further included, that is, in the phase 5, the control unit 71 may The adapter feeds back the current voltage of the multi-cell 13 when the current voltage of the multi-cell 13 reaches the constant voltage charging voltage threshold, the charging phase shifts from the constant current phase to the constant voltage phase, and in the constant voltage phase, the charging current is gradually reduced. When the current drops to a certain threshold, the charging is stopped, indicating that the multi-cell 13 has been fully charged.

Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the various examples described in connection with the embodiments disclosed herein can be implemented in the form of an electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods for implementing the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present invention.

A person skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working procedures of the system, the device and the unit described above can refer to the corresponding programs in the foregoing method embodiments, and details are not described herein again.

In the several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division, and the actual implementation may have another division manner, for example, a plurality of units or components may be combined or may be integrated into Another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be electrical, mechanical or otherwise.

The units described as separate components may or may not be physically separate. The components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist as a separate entity, or two or more units may be integrated into one unit.

This function, if implemented as a software functional unit and sold or used as a standalone product, can be stored on a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product in essence or in part of the prior art, and the computer software product is stored in a storage medium, including several The instructions are for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method of various embodiments of the present invention. The foregoing storage medium includes: a flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or a compact disk, and the like. Media.

10: Mobile terminal 11: Charging interface 12: First charging circuit 13: Multi-cell 21: Buck circuit 22, 32: Power supply circuit 33: Equalization circuit 51: Battery 52: Battery protection board 71: Control unit

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings to be used in the embodiments of the present invention will be briefly described below. It is obvious that the drawings described below are only some embodiments of the present invention, Those skilled in the art can also obtain other drawings based on these drawings without paying any creative work. 1 is a schematic structural diagram of a mobile terminal according to an embodiment of the present invention. 2 is a schematic structural diagram of a mobile terminal according to another embodiment of the present invention. Fig. 3a is a schematic structural diagram of a mobile terminal according to still another embodiment of the present invention. Fig. 3b is a schematic structural diagram of a mobile terminal according to still another embodiment of the present invention. Fig. 4 is a waveform diagram of a pulsating direct current according to an embodiment of the present invention. Fig. 5 is a schematic structural diagram of a mobile terminal according to still another embodiment of the present invention. Fig. 6 is a schematic structural diagram of a mobile terminal according to still another embodiment of the present invention. Figure 7 is a schematic structural diagram of a mobile terminal according to still another embodiment of the present invention. Figure 8 is a flow chart of a fast charge procedure in accordance with an embodiment of the present invention.

Claims (16)

A mobile terminal includes: a charging interface; a first charging circuit, the first charging circuit is connected to the charging interface, receives an output voltage and an output current of an adapter through the charging interface, and outputs the adapter The voltage and the output current are directly loaded at two ends of a plurality of cells connected in series in the mobile terminal, and the multi-cell is directly charged; a step-down circuit, an input end of the step-down circuit and the multi-cell Connected at both ends for converting the total voltage of the plurality of cells into a first voltage V ₁ , wherein a V ₁ b, a represents the minimum operating voltage of the mobile terminal, b represents the maximum operating voltage of the mobile terminal; a power supply circuit is connected to the output of the buck circuit, and the mobile terminal is powered based on the first voltage, the first The voltage is 1/N of the total voltage of the multi-cell, wherein N represents the number of cells included in the multi-cell. The mobile terminal of claim 2, wherein the step-down circuit is a charge pump. The mobile terminal of claim 1, wherein the output current of the adapter received by the first charging circuit is pulsed direct current or alternating current. The mobile terminal according to claim 1, wherein the charging mode of the first charging circuit is a constant current mode. The mobile terminal according to any one of claims 1 to 4, wherein the mobile terminal further comprises: a second charging circuit, the second charging circuit comprising a boosting circuit, the boosting circuit The two ends are respectively connected to the charging interface and the multi-cell, the boosting circuit receives an output voltage of the adapter through the charging interface, boosts the output voltage of the adapter to a second voltage, and the second voltage is carried. Entering at the two ends of the multi-cell, charging the multi-cell, wherein the output voltage of the adapter received by the second charging circuit is less than the total voltage of the multi-cell, the second voltage being greater than the multi-cell Total voltage. The mobile terminal of claim 5, wherein the output voltage of the adapter received by the second charging circuit is 5V. The action terminal of claim 5, wherein the charging mode corresponding to the first charging circuit is a fast charging mode, and the charging mode corresponding to the second charging circuit is a normal charging mode, and the charging mode of the fast charging mode is greater than The charging speed of this normal charging mode. The mobile terminal of claim 7, wherein the charging interface comprises a data line, the mobile terminal further comprising a control unit, wherein the control unit performs bidirectional communication with the adapter through the data line to control the multi-saving Core charging procedure. The mobile terminal according to claim 8, wherein the control unit performs bidirectional communication with the adapter through the data line to control a charging procedure of the multi-cell, including: the control unit and the adapter perform two-way communication, Determining a charging mode; in the case of determining to charge the mobile terminal using the fast charging mode, the control unit controls the adapter to charge the multi-cell by the first charging circuit; determining to use the normal charging mode to charge the mobile terminal In the case, the control unit controls the adapter to charge the multi-cell by the second charging circuit. The mobile terminal of claim 9, wherein the control unit performs bidirectional communication with the adapter to determine a charging mode, comprising: the control unit receiving a first instruction sent by the adapter, the first instruction being used for Querying whether the mobile terminal activates the fast charging mode; the control unit sends a reply command of the first instruction to the adapter, where the reply command of the first instruction is used to indicate that the mobile terminal agrees to enable the fast charging mode. The mobile terminal according to claim 8, wherein the control unit performs bidirectional communication with the adapter through the data line to control a charging procedure of the multi-cell, including: the control unit and the adapter perform two-way communication, The charging voltage of the fast charging mode is determined. The mobile terminal according to claim 11, wherein the control unit performs bidirectional communication with the adapter to determine a charging voltage of the fast charging mode, and the control unit receives a second command sent by the adapter, where The second instruction is configured to query whether the current voltage output by the adapter is suitable as the charging voltage of the fast charging mode; the control unit sends a reply instruction of the second instruction to the adapter, and the reply instruction of the second instruction is used to indicate the The current voltage is suitable, high or low. The mobile terminal according to claim 8, wherein the control unit performs bidirectional communication with the adapter through the data line to control a charging procedure of the multi-cell, including: the control unit and the adapter perform two-way communication, The charging current of the fast charging mode is determined. The mobile terminal according to claim 13 , wherein the control unit performs bidirectional communication with the adapter to determine a charging current of the fast charging mode, and the control unit receives a third command sent by the adapter, where The third instruction is used to query the maximum charging current currently supported by the mobile terminal; the control unit sends a reply command of the third instruction to the adapter, where the reply command of the third instruction is used to indicate the maximum charging current currently supported by the mobile terminal. In order to The adapter determines the charging current of the fast charging mode based on the maximum charging current currently supported by the mobile terminal. The mobile terminal of claim 8, wherein the control unit performs bidirectional communication with the adapter through the data line to control a charging procedure of the multi-cell, including: in a program for charging using the fast charging mode The control unit performs bidirectional communication with the adapter to adjust the output current of the adapter. The mobile terminal of claim 15, wherein the control unit performs bidirectional communication with the adapter to adjust an output current of the adapter, comprising: the control unit receiving a fourth command sent by the adapter, the fourth The instruction is used to query the current voltage of the multi-cell; the control unit sends a reply instruction of the fourth instruction to the adapter, and the reply instruction of the fourth instruction is used to indicate a current voltage of the multi-cell, so that the adapter is configured according to the The current voltage of the multi-cell is adjusted to adjust the charging current of the adapter.