CN110649673A

CN110649673A - Mobile terminal

Info

Publication number: CN110649673A
Application number: CN201910894570.2A
Authority: CN
Inventors: 胡二勐
Original assignee: Hisense Mobile Communications Technology Co Ltd
Current assignee: Hisense Mobile Communications Technology Co Ltd
Priority date: 2019-09-20
Filing date: 2019-09-20
Publication date: 2020-01-03
Anticipated expiration: 2039-09-20
Also published as: CN110649673B

Abstract

The invention discloses a mobile terminal, comprising: a charging peripheral and a body; the charging peripheral comprises a first battery, a first voltage conversion circuit, a first switching circuit and a first processor; the body comprises a second battery, a second voltage conversion circuit, a second switching circuit and a host; the host comprises a second processor; in the parallel battery mode, the first processor is configured to control the first end and the third end of the first switching circuit to be conducted, and the second processor is configured to control the first end and the third end of the second switching circuit to be conducted, so that the first battery and the second battery supply power to the host in a parallel mode; in the charger mode, the first processor is configured to control the second terminal and the third terminal of the first switching circuit to be conducted, and the second processor is configured to control the first terminal and the second terminal of the second switching circuit to be connected. Compared with the prior art, the mobile terminal can work in a battery parallel mode or a charger mode.

Description

Mobile terminal

Technical Field

The present invention relates to the field of communications, and in particular, to a mobile terminal.

Background

With the technical development and wide use of various intelligent terminals, the dependence degree of users on the intelligent terminals is higher and higher, and the use frequency is higher and higher. Because the energy density of the battery is not a major breakthrough all the time, the method for charging the intelligent terminal by utilizing the mobile power supplies such as the charger and the like becomes a common method for improving the endurance of the intelligent terminal.

Disclosure of Invention

The exemplary embodiment of the invention provides a mobile terminal, which can improve the experience of a user in operating the mobile terminal.

According to an aspect of the exemplary embodiments, there is provided a mobile terminal including: a charging peripheral and a body;

the charging peripheral includes: the device comprises a first battery, a first voltage conversion circuit, a first switching circuit, a first processor and an output interface;

the body includes: the second battery, the second voltage conversion circuit, the second switching circuit, the host and the input interface;

the host comprises a display for displaying a user interface and a second processor coupled with the display; the output interface of the charging peripheral is electrically connected with the input interface of the body and is used for transmitting electric signals and data signals;

the first end of the first switching circuit is connected with one end of the first battery, the second end of the first switching circuit is connected with the output end of the first voltage conversion circuit, and the third end of the first switching circuit is connected with the output interface; the battery connecting end of the first voltage conversion circuit is connected with one end of the first battery;

the first end of the second switching circuit is connected with the input interface, the second end of the second switching circuit is connected with the input end of the second voltage conversion circuit, and the third end of the second switching circuit is connected with the host; the output end of the second voltage conversion circuit is respectively connected with one end of a second battery and the host;

the mobile terminal works in a battery parallel mode or a charger mode;

in the parallel battery mode, the first processor is configured to control the first end and the third end of the first switching circuit to be conducted, and the second processor is configured to control the first end and the third end of the second switching circuit to be conducted, so that the first battery and the second battery supply power to the host in a parallel mode;

in the charger mode, the first processor is configured to control the second terminal and the third terminal of the first switching circuit to be conducted, and the second processor is configured to control the first terminal and the second terminal of the second switching circuit to be connected.

In some exemplary embodiments, if it is detected that a voltage difference between the first battery and the second battery is smaller than a preset threshold, the mobile terminal operates in a parallel battery mode, otherwise, the mobile terminal operates in a charger mode.

In some exemplary embodiments, the first battery charges the second battery during the mobile terminal is operating in a charger mode.

In some exemplary embodiments, the input terminal of the first voltage conversion circuit is connected to an external charger, the mobile terminal operates in a charger mode, and the external charger charges the first battery and/or the second battery.

In some exemplary embodiments, the charging peripheral further comprises a first fuel gauge for measuring a voltage of the first battery; the body further includes a second electricity meter for measuring a voltage of the second battery.

In some exemplary embodiments, the charging peripheral further comprises a current limiting protection circuit connected in series between the first battery and the first switching circuit;

and if the output current of the current-limiting protection circuit is greater than the preset current, the mobile terminal is switched from a battery parallel mode to a charger mode.

In some exemplary embodiments, the first switching circuit is a single pole double throw switch circuit.

In some exemplary embodiments, the second switching circuit is a single pole double throw switch circuit.

In some exemplary embodiments, the first voltage conversion circuit includes a first control chip, a first NMOS transistor, a second NMOS transistor, a third NMOS transistor, a first inductor, and a first capacitor;

the grid electrode of the first NMOS tube, the grid electrode of the second NMOS tube and the grid electrode of the third NMOS tube are all connected with the first control chip;

the drain electrode of the first NMOS tube is connected with the input end, and the source electrode and the drain electrode of the second NMOS tube are both connected with the output end;

the source electrode of the second NMOS tube and the source electrode of the third NMOS tube are both connected with one end of the first inductor, and the other end of the first inductor and one end of the first capacitor are both connected with the battery connecting end;

and the drain electrode of the third NMOS tube and the other end of the first capacitor are both connected with a grounding end.

In some exemplary embodiments, the second voltage conversion circuit includes a second control chip, a fourth NMOS transistor, a fifth NMOS transistor, a second inductor, and a second capacitor;

the grid electrode of the fourth NMOS tube and the grid electrode of the fifth NMOS tube are both connected with the second control chip;

the drain electrode of the fourth NMOS tube is connected with the input end, the source electrode of the fourth NMOS tube and the source electrode of the fifth NMOS tube are both connected with one end of a second inductor, and the other end of the second inductor and one end of a second capacitor are both connected with the output end;

and the drain electrode of the fifth NMOS tube and the other end of the second capacitor are both connected with the ground terminal.

On the basis of the common knowledge in the field, the above preferred conditions can be combined randomly to obtain the preferred embodiments of the invention.

The positive progress effects of the invention are as follows: according to the invention, the mobile terminal can work in a battery parallel mode or a charger mode by arranging the first switching circuit in the charging peripheral and controlling the first switching circuit and arranging the second switching circuit in the body and controlling the second switching circuit. When the mobile terminal works in the battery parallel mode, the voltage output by the first battery can be input to the host without being converted by the voltage conversion circuit, and compared with the mobile terminal which works in the charger bank mode, the power supply efficiency of the charging peripheral is obviously improved.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

Fig. 1 schematically illustrates a structure of a mobile terminal according to an embodiment of the present invention;

FIG. 2 illustrates a schematic diagram of a user interface on a mobile terminal provided by an embodiment of the invention;

fig. 3 (a) schematically shows a structure of the back of the body provided by the embodiment of the invention;

fig. 3 (b) is a schematic structural diagram schematically illustrating the front surface of the body provided by the embodiment of the invention;

fig. 4 (a) is a schematic diagram illustrating a front side of a charging peripheral according to an embodiment of the present invention;

fig. 4 (b) is a schematic structural diagram illustrating a back side of a charging peripheral provided by an embodiment of the present invention;

fig. 5 (a) is a schematic structural diagram illustrating a front side of a mobile terminal according to an embodiment of the present invention;

fig. 5 (b) is a schematic structural diagram illustrating a back side of a mobile terminal according to an embodiment of the present invention;

fig. 6 is a block diagram illustrating a structure of a mobile terminal according to an embodiment of the present invention;

fig. 7 is a schematic diagram illustrating a current flow of a mobile terminal operating in a parallel battery mode according to an embodiment of the present invention;

fig. 8 is a schematic current flow diagram illustrating a mobile terminal operating in a charger mode according to an embodiment of the present invention;

fig. 9 is a schematic diagram illustrating a current flow when the mobile terminal is connected to an external charger according to an embodiment of the present invention;

fig. 10 is a block diagram illustrating a structure of a mobile terminal according to an embodiment of the present invention;

fig. 11 illustrates a schematic diagram of a first voltage conversion circuit provided by an embodiment of the present invention;

fig. 12 illustrates a schematic diagram of a second voltage conversion circuit provided by an embodiment of the present invention;

fig. 13 is a block diagram illustrating a structure of a mobile terminal according to an embodiment of the present invention;

fig. 14 illustrates a schematic diagram of a current limiting protection circuit provided by an embodiment of the present invention.

Detailed Description

To make the objects, technical solutions and advantages of the exemplary embodiments of the present application clearer, the technical solutions in the exemplary embodiments of the present application will be clearly and completely described below with reference to the drawings in the exemplary embodiments of the present application, and it is obvious that the described exemplary embodiments are only a part of the embodiments of the present application, but not all the embodiments.

All other embodiments, which can be derived by a person skilled in the art from the exemplary embodiments shown in the present application without inventive effort, shall fall within the scope of protection of the present application. Moreover, while the disclosure herein has been presented in terms of exemplary one or more examples, it is to be understood that each aspect of the disclosure can be utilized independently and separately from other aspects of the disclosure to provide a complete disclosure.

It should be understood that the terms "first," "second," "third," and the like in the description and in the claims of the present application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used are interchangeable under appropriate circumstances and can be implemented in sequences other than those illustrated or otherwise described herein with respect to the embodiments of the application, for example.

Furthermore, the terms "comprises" and "comprising," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a product or device that comprises a list of elements is not necessarily limited to those elements explicitly listed, but may include other elements not expressly listed or inherent to such product or device.

The term "unit" as used herein refers to any known or later developed hardware, software, firmware, artificial intelligence, fuzzy logic, or combination of hardware and/or software code that is capable of performing the functionality associated with that element.

A block diagram of a hardware configuration of a mobile terminal 100 according to an exemplary embodiment is exemplarily shown in fig. 1. As shown in fig. 1, the mobile terminal 100 includes: a Radio Frequency (RF) circuit 110, a memory 120, an input unit 130, a display unit 140, a sensor 150, an audio circuit 160, a Wireless Fidelity (Wi-Fi) module 170, a processor 180, a bluetooth module 181, and a power supply 190.

The RF circuit 110 may be used for receiving and transmitting signals during information transmission and reception or during a call, and may receive downlink data of a base station and then send the downlink data to the processor 180 for processing; the uplink data may be transmitted to the base station. Typically, the RF circuitry includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, and the like.

The memory 120 may be used to store software programs and data. The processor 180 performs various functions of the mobile terminal 100 and data processing by executing software programs or data stored in the memory 120. The memory 120 may include high speed random access memory and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device. The memory 120 stores an operating system that enables the mobile terminal 100 to operate. The memory 120 may store an operating system and various application programs, and may also store codes for performing the methods described in the embodiments of the present application.

The input unit 130, such as a touch screen, may be used to receive input numeric or character information, generate signal inputs related to user settings and function control of the mobile terminal 100. Specifically, the input unit 130 may include a touch screen 131 disposed on a front surface of the mobile terminal 100 and may collect a touch operation by a user thereon or nearby. The input unit 130 in this application may receive a touch operation of a user, such as clicking a button, dragging a scroll box, and the like.

The display unit 140 may be used to display information input by the user or information provided to the user and a Graphical User Interface (GUI) of various menus of the terminal 100. The display unit 140 may include a display screen 141 disposed on the front surface of the mobile terminal 100. The display screen 141 may be configured in the form of a liquid crystal display, a light emitting diode, or the like. The display unit 140 may be used to display various graphical user interfaces described herein. The touch screen 131 may cover the display screen 141, or the touch screen 131 and the display screen 141 may be integrated to implement an input and output function of the mobile terminal 100, and the integrated function may be referred to as a touch display screen for short. In the present application, the display unit 140 may display the application programs and the corresponding operation steps.

The mobile terminal 100 may also include at least one sensor 150, such as an acceleration sensor 155, a light sensor, a motion sensor. The mobile terminal 100 may also be configured with other sensors such as a gyroscope, barometer, hygrometer, thermometer, infrared sensor, and the like.

The audio circuitry 160, speaker 161, microphone 162 may provide an audio interface between a user and the mobile terminal 100. The audio circuit 160 may transmit the electrical signal converted from the received audio data to the speaker 161, and convert the electrical signal into a sound signal for output by the speaker 161. The mobile terminal 100 may also be provided with a volume button for adjusting the volume of the sound signal. On the other hand, the microphone 162 converts the collected sound signal into an electrical signal, converts the electrical signal into audio data after being received by the audio circuit 160, and outputs the audio data to the RF circuit 110 to be transmitted to, for example, another terminal or outputs the audio data to the memory 120 for further processing. In this application, the microphone 162 may capture the voice of the user.

Wi-Fi belongs to a short-distance wireless transmission technology, and the mobile terminal 100 may help a user to receive and transmit e-mails, browse webpages, access streaming media, and the like through the Wi-Fi module 170, which provides a wireless broadband internet access for the user.

The processor 180 is a control center of the mobile terminal 100, connects various parts of the entire terminal using various interfaces and lines, and performs various functions of the mobile terminal 100 and processes data by running or executing software programs stored in the memory 120 and calling data stored in the memory 120. In some embodiments, processor 180 may include one or more processing units; the processor 180 may also integrate an application processor, which mainly handles operating systems, user interfaces, applications, etc., and a baseband processor, which mainly handles wireless communications. It will be appreciated that the baseband processor described above may not be integrated into the processor 180. In the present application, the processor 180 may run an operating system, an application program, a user interface display, and a touch response, and the processing method described in the embodiments of the present application. In addition, the processor 180 is coupled with the input unit 130 and the display unit 140.

And the bluetooth module 181 is configured to perform information interaction with other bluetooth devices having a bluetooth module through a bluetooth protocol. For example, the mobile terminal 100 may establish a bluetooth connection with a wearable electronic device (e.g., a smart watch) having a bluetooth module via the bluetooth module 181, so as to perform data interaction.

The mobile terminal 100 also includes a power supply 190 (e.g., a battery) that powers the various components. The power supply may be logically connected to the processor 180 through a power management system to manage charging, discharging, power consumption, etc. through the power management system. The mobile terminal 100 may also be configured with power buttons for powering the terminal on and off, and locking the screen.

Fig. 2 is a schematic diagram illustrating a user interface on a mobile terminal (e.g., mobile terminal 100 of fig. 1). In some implementations, a user can open a corresponding application by touching an application icon on the user interface, or can open a corresponding folder by touching a folder icon on the user interface.

The mobile terminal in the embodiment of the present invention may be a mobile phone, a tablet computer, a PDA (personal digital assistant), and other devices, including: charging peripheral equipment and body.

In an alternative embodiment, fig. 3 (a) and 3 (b) are schematic structural views for illustrating a back surface and a front surface of the body, respectively. Fig. 4 (a) and 4 (b) are schematic structural views for illustrating the front side of the charging peripheral and the back side of the charging peripheral, respectively. Fig. 5 (a) and 5 (b) are schematic structural views for illustrating the front and rear surfaces of the mobile terminal, respectively.

With reference to fig. 3-5, in some implementations, a first pin contact interface 300 is disposed on the back of the body, a second pin contact interface 400 is disposed on the charging peripheral device, and after the charging peripheral device is installed on the charging peripheral device, the first pin contact interface 300 is electrically connected to the second pin contact interface 400.

Fig. 6 is a block diagram for illustrating a structure of a mobile terminal according to an embodiment of the present invention.

As shown in fig. 6, the charging peripheral includes: the first battery, the first voltage conversion circuit, the first switching circuit, the first processor and the output interface. The body comprises a second battery, a second voltage conversion circuit, a second switching circuit, a host and an input interface. The host includes a display for displaying a user interface and a second processor coupled to the display.

And the output interface of the charging peripheral is electrically connected with the input interface of the body and is used for transmitting electric signals and data signals. In one implementation, the input interface in the main body is the first pin contact interface 300 in fig. 3-5, and the output interface in the charging peripheral is the second pin contact interface 400 in fig. 3-5.

The first end of the first switching circuit is connected with one end of the first battery, the second end of the first switching circuit is connected with the output end of the first voltage conversion circuit, and the third end of the first switching circuit is connected with the output interface; the battery connection end of the first voltage conversion circuit is connected with one end of the first battery.

The first end of the second switching circuit is connected with the input interface, the second end of the second switching circuit is connected with the input end of the second voltage conversion circuit, and the third end of the second switching circuit is connected with the host; the output end of the second voltage conversion circuit is respectively connected with one end of the second battery and the host.

The mobile terminal works in a battery parallel mode or a charger baby mode.

Fig. 7 is a schematic current flow diagram for illustrating the mobile terminal operating in the parallel battery mode according to the embodiment of the present invention. In the parallel battery mode, the first processor is configured to control the first terminal and the third terminal of the first switching circuit to conduct, and the second processor is configured to control the first terminal and the third terminal of the second switching circuit to conduct, so that the first battery and the second battery supply power to the host in a parallel manner, and a specific current flow direction is as shown in fig. 7.

Fig. 8 is a schematic current flow diagram for illustrating that the mobile terminal provided by the embodiment of the present invention operates in the charger mode. Fig. 9 is a schematic diagram for illustrating a current flow when the mobile terminal provided by the embodiment of the present invention is connected to an external charger.

In one implementation, during the mobile terminal operating in the charger mode, the first battery charges the second battery, and the specific current flow is as shown in fig. 8. Meanwhile, the first battery also supplies power for the host in the body.

In another specific implementation, an input terminal of the first voltage conversion circuit in the mobile terminal is connected to an external charger, the mobile terminal operates in the charger mode, and the external charger charges the first battery and/or the second battery, and a specific current flow is as shown in fig. 9. In some implementations, the charging peripheral device has a charging port therein, through which the charging peripheral device is connected to an external charger.

In some implementations, if the first battery and the second battery are not full of electricity, the external charger charges the first battery and the second battery at the same time and also supplies power to the host in the body. In some implementations, when the first battery is full and the second battery is not full, the external charger only charges the second battery and also supplies power to the host in the body. In some implementations, if the first battery is not full and the second battery is full, the external charger charges only the first battery and also supplies power to the host in the body.

In the embodiment of the invention, in the charger mode, the voltage output by the first battery can be input to the second battery and the host machine only after being converted by the first voltage conversion circuit and the second voltage conversion circuit, that is, the second battery and the host machine are charged. In some practical implementations, the voltage conversion efficiency of one voltage conversion circuit is about 80%, and in this embodiment, after the voltage conversion of two voltage conversion circuits, the conversion efficiency is only less than 70%. Assuming that the capacity of the second battery in the charging peripheral is 10000mAh, only less than 7000mAh is actually available for the body.

In the parallel battery mode, the voltage output by the first battery can be input into the host in the body without passing through the voltage conversion circuit, and specifically, the first battery and the second battery are connected in parallel to supply power to the host. Compared with the charger in the charger mode, the power supply efficiency of the charging peripheral is obviously improved.

In one specific implementation, if it is detected that the voltage difference between the first battery and the second battery is smaller than a preset threshold, the mobile terminal operates in a battery parallel mode, otherwise, the mobile terminal operates in a charger mode.

When the voltage difference between the first battery and the second battery is smaller than a preset threshold value, the mobile terminal works in a battery parallel mode; on the contrary, when the voltage difference between the first battery and the second battery is greater than or equal to the preset threshold, the mobile terminal works in the charger mode.

In some implementations, the predetermined threshold Vth of the voltage difference Δ V between the first battery and the second battery is set according to the following principle: Vth/(Rbat 1+ Rbat2+ Rrod) < Ith. Wherein, Rbat1 is the internal resistance of the second battery in the body, Rbat2 is the internal resistance of the first battery in the charging peripheral device, Rrod is the impedance value on the line, and Ith is the maximum charging and discharging current supported by the first battery. Therefore, when the first battery and the second battery are connected in parallel, the current output from the first battery of the charging peripheral cannot exceed the preset current limiting protection threshold Ith.

Fig. 10 is a block diagram for illustrating a structure of a mobile terminal according to an embodiment of the present invention.

In an alternative embodiment, as shown in fig. 10, the charging peripheral further includes a first electricity meter for measuring a voltage of the first battery; the body further includes a second electricity meter for measuring a voltage of the second battery.

In an alternative embodiment, the voltage of the first battery is read using the ADC interface of the first processor and the voltage of the second battery is read using the ADC interface of the second processor.

In an alternative embodiment, the first switching circuit is a single pole double throw switch circuit.

In another optional embodiment, the first switching circuit includes a first switching tube and a second switching tube, one end of the first switching tube is connected to one end of the first battery, the other end of the first switching tube is connected to the output interface, one end of the second switching tube is connected to the output end of the first voltage conversion circuit, and the other end of the second switching tube is connected to the output interface.

In the parallel battery mode, the first processor is configured to control the first switch tube to be turned on and the second switch tube to be turned off. In the power bank mode, the first processor is configured to control the second switch tube to be turned on, and the first switch tube to be turned off.

The first switch tube and the second switch tube may be NMOS tubes or PMOS tubes.

In an alternative embodiment, the second switching circuit is a single pole double throw switch circuit.

In another optional embodiment, the second switching circuit includes a third switching tube and a fourth switching tube, one end of the third switching tube is connected to the input end of the second voltage conversion circuit, the other end of the third switching tube is connected to the input interface, one end of the fourth switching tube is connected to the host, and the other end of the fourth switching tube is connected to the input interface.

In the parallel battery mode, the second processor is configured to control the fourth switching tube to be turned on, and the third switching tube to be turned off. In the charger mode, the second processor is configured to control the third switch tube to be turned on and the fourth switch tube to be turned off.

The third switching tube and the fourth switching tube may be NMOS tubes or PMOS tubes.

Fig. 11 is a schematic diagram illustrating a first voltage conversion circuit according to an embodiment of the present invention.

The input end of the first voltage conversion circuit is used for being connected with an external charger, the output end of the first voltage conversion circuit is used for being connected with the first switching circuit, and the battery port is used for being connected with the first battery. In one implementation, as shown in fig. 11, the first voltage converting circuit includes a first control chip, a first NMOS transistor Q1, a second NMOS transistor Q2, a third NMOS transistor Q3, a first inductor L1, and a first capacitor C1.

The grid electrode of the first NMOS transistor Q1, the grid electrode of the second NMOS transistor Q2 and the grid electrode of the third NMOS transistor Q3 are all connected with the first control chip; the drain electrode of the first NMOS tube Q1 is connected with the input end, and the source electrode and the drain electrode of the second NMOS tube Q2 are both connected with the output end; the source electrode of the second NMOS transistor Q2 and the source electrode of the third NMOS transistor Q3 are both connected with one end of a first inductor L1, and the other end of the first inductor L1 and one end of a first capacitor C1 are both connected with the battery connection end; the drain of the third NMOS transistor Q3 and the other end of the first capacitor C1 are both connected to ground.

When an external charger is inserted, the first NMOS tube Q1 is switched on, the second NMOS tube Q2 and the third NMOS tube Q3 are switched on and off alternately, and form a voltage reduction circuit with the first inductor L1 and the first capacitor C1 to charge the first battery, and meanwhile, the voltage of the external charger is also output to the output end through the first NMOS tube Q1.

When no external charger is inserted, the second NMOS transistor Q2, the third NMOS transistor Q3, the first inductor L1 and the first capacitor C1 form a reverse voltage boost circuit, and output voltage to the first switching circuit through the charging output port, and at this time, the first NMOS transistor Q1 is turned off to prevent voltage from reaching the input terminal.

In some implementations, the first voltage conversion circuit may be implemented with a dedicated DC-DC chip.

Fig. 12 is a schematic diagram for illustrating a second voltage conversion circuit provided by an embodiment of the present invention.

The input end of the second voltage conversion circuit is used for being connected with the second switching circuit, and the output end of the second voltage conversion circuit is used for being connected with the second battery and the host. In one implementation, as shown in fig. 12, the second voltage converting circuit includes a second control chip, a fourth NMOS transistor Q4, a fifth NMOS transistor Q5, a second inductor L2, and a second capacitor C2.

The grid electrode of the fourth NMOS transistor Q4 and the grid electrode of the fifth NMOS transistor Q5 are both connected with the second control chip; the drain electrode of the fourth NMOS transistor Q5 is connected with the input end, the source electrode of the fifth NMOS transistor Q5 and the source electrode of the fifth NMOS transistor Q5 are both connected with one end of a second inductor L2, and the other end of the second inductor L2 and one end of a second capacitor C2 are both connected with the output end; the drain of the fifth NMOS transistor Q5 and the other end of the second capacitor C2 are both connected to ground.

The operating principle of the second voltage conversion circuit is as follows: when the input end has voltage access, the fourth NMOS tube Q4 and the fifth NMOS tube Q5 in the second NMOS tube are alternately switched on and off under the action of the second control chip, and the second inductor L2 and the second capacitor C2 are matched to realize the voltage reduction effect to charge and discharge the second battery.

In other implementations, the second voltage conversion circuit may also be implemented with a dedicated charging chip or a buck DC-DC.

Fig. 13 is a block diagram for illustrating a structure of a mobile terminal according to an embodiment of the present invention.

In order to prevent the output current of the first battery of the charging peripheral from being too large when the two battery paths are connected in parallel, that is, in the parallel battery mode, in an alternative embodiment, as shown in fig. 13, the charging peripheral further includes a current-limiting protection circuit connected in series between the first battery and the first switching circuit; and if the output current of the current-limiting protection circuit is greater than the preset current, the mobile terminal is switched from a battery parallel mode to a charger mode.

In this embodiment, the current-limiting protection circuit functions as: and monitoring the output current of a battery path in the charging peripheral in the parallel battery mode, and determining whether to maintain or disconnect the battery output path.

Specifically, a current limiting protection threshold, namely a preset current, is set to Ith, and the value of Ith can be set according to the maximum charge-discharge current supported by the first battery, in the invention, the Ith value is set to 2.5A, and the current limiting value mainly plays a role in abnormal protection and cannot exceed the current value under normal conditions.

Fig. 14 is a schematic diagram illustrating a current limiting protection circuit according to an embodiment of the present invention.

As shown in fig. 14, the current limiting protection circuit includes a third control chip and a sixth NMOS transistor Q6, where the third control chip dynamically adjusts the on-resistance of the sixth NMOS transistor Q6 by monitoring the current flowing through the sixth NMOS transistor Q6 in real time to achieve the purpose of current limiting. The input end of the current-limiting protection circuit is used for being connected with a first battery, the output end of the current-limiting protection circuit is used for being connected with a first switching circuit, and the FAULT interface is used for outputting an overcurrent signal when the current of the sixth NMOS tube Q6 exceeds a preset current and sending the overcurrent signal to a first processor in a charging peripheral.

When receiving an overcurrent signal, the first processor is configured to control the second end and the third end of the first switching circuit to be conducted, and send the overcurrent signal to the second processor; and the second processor is configured to control the first end and the second end of the second switching circuit to be connected when receiving the over-current signal, namely, the mobile terminal is controlled to work in a charge pal mode.

Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.

While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that these are by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.

Claims

1. A mobile terminal, comprising: a charging peripheral and a body;

the mobile terminal works in a battery parallel mode or a charger mode;

2. The mobile terminal of claim 1, wherein if it is detected that the voltage difference between the first battery and the second battery is less than a preset threshold, the mobile terminal operates in a parallel battery mode, otherwise the mobile terminal operates in a charge pal mode.

3. The mobile terminal of claim 1, wherein the first battery charges the second battery during operation of the mobile terminal in a charger mode.

4. The mobile terminal of claim 1, wherein an input terminal of the first voltage conversion circuit is connected to an external charger, the mobile terminal operates in a charger mode, and the external charger charges the first battery and/or the second battery.

5. The mobile terminal of claim 1, wherein the charging peripheral further comprises a first fuel gauge for measuring a voltage of the first battery; the body further includes a second electricity meter for measuring a voltage of the second battery.

6. The mobile terminal of claim 1, wherein the charging peripheral further comprises a current limiting protection circuit connected in series between the first battery and the first switching circuit;

7. The mobile terminal of claim 1, wherein the first switching circuit is a single pole double throw switch circuit.

8. The mobile terminal of claim 1, wherein the second switching circuit is a single pole double throw switch circuit.

9. The mobile terminal of claim 1, wherein the first voltage conversion circuit comprises a first control chip, a first NMOS transistor, a second NMOS transistor, a third NMOS transistor, a first inductor, and a first capacitor;

10. The mobile terminal of claim 1, wherein the second voltage conversion circuit comprises a second control chip, a fourth NMOS transistor, a fifth NMOS transistor, a second inductor, and a second capacitor;