CN110649673B

CN110649673B - Mobile terminal

Info

Publication number: CN110649673B
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: 2023-05-12
Anticipated expiration: 2039-09-20
Also published as: CN110649673A

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 includes a second processor; in the battery parallel mode, the first processor is configured to control the first end of the first switching circuit to be communicated with the third end, and the second processor is configured to control the first end of the second switching circuit to be communicated with the third end, so that the first battery and the second battery supply power to the host in a parallel mode; in the treasured that charges mode, the first processor is configured to control the second end of first switching circuit to switch on with the third end, and the second processor is configured to control the first end of second switching circuit to be connected with the second end. 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 invention relates to the field of communication, in particular to a mobile terminal.

Background

Along with the technical development and wide use of various intelligent terminals, the degree of dependence of users on the intelligent terminals is higher and higher, and the use frequency is also higher and higher. The battery energy density is not broken through greatly, so that the mobile power source such as a charger is used for charging the intelligent terminal, and the method for improving the endurance capacity of the intelligent terminal is a common method.

Disclosure of Invention

According to the mobile terminal provided by the exemplary embodiment of the invention, the experience of operating the mobile terminal by a user can be improved.

According to an aspect in an exemplary embodiment, there is provided a mobile terminal including: a charging peripheral and a body;

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 includes: the device 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 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 the second battery and the host;

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

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

in the treasured that charges mode, the first processor is configured to control the second end of first switching circuit to switch on with the third end, and the second processor is configured to control the first end of second switching circuit to be connected with the second end.

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

In some exemplary embodiments, the first battery charges the second battery during operation of the mobile terminal 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 also includes a second electricity meter for measuring a voltage of a 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 larger 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 switching circuit.

In some exemplary embodiments, the second switching circuit is a single pole double throw switching 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 connected with one end of the first inductor, and the other end of the first inductor and one end of the first capacitor are connected with the battery connecting end;

the drain electrode of the third NMOS tube and the other end of the first capacitor are both connected with the 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 inductance, and a second capacitance;

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

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

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

The invention has the positive progress effects that: according to the invention, the mobile terminal can work in the battery parallel mode or the battery bank 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 working in the charger 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, a brief description will be given below of the drawings that are needed in the embodiments or the prior art descriptions, it being obvious that the drawings in the following description are some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort to a person skilled in the art.

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

FIG. 2 schematically illustrates a user interface on a mobile terminal according to an embodiment of the present invention;

fig. 3 (a) is a schematic diagram illustrating a structure of a back surface of a body according to an embodiment of the present invention;

fig. 3 (b) is a schematic diagram illustrating the structure of the front surface of the body according to the embodiment of the present invention;

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

fig. 4 (b) is a schematic diagram illustrating a structure of a back surface of a charging peripheral according to an embodiment of the present invention;

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

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

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

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

fig. 8 schematically illustrates a current flow diagram of 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 according to the embodiment of the present invention is connected to an external charger;

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

fig. 11 schematically illustrates a schematic diagram of a first voltage conversion circuit according to an embodiment of the present invention;

fig. 12 is a schematic diagram schematically illustrating a second voltage conversion circuit according to an embodiment of the present invention;

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

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

Detailed Description

For the purposes of making the objects, technical solutions and advantages of the exemplary embodiments of the present application more apparent, 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 apparent that the described exemplary embodiments are only some embodiments of the present application, but not all embodiments.

All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present application, are intended to be within the scope of the present application based on the exemplary embodiments shown in the present application. Furthermore, while the disclosure has been presented in terms of an exemplary embodiment or embodiments, it should be understood that various aspects of the disclosure can be practiced separately from the disclosure in a complete subject matter.

It should be understood that the terms "first," "second," "third," and the like in the description and in the claims and in the above-described figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate, such as where appropriate, for example, implementations other than those illustrated or described in accordance with embodiments of the present application.

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

The term "unit" as used in this application 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 function associated with that element.

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

The RF circuit 110 may be used for receiving and transmitting signals during the process of receiving and transmitting information or communication, and may receive downlink data of the base station and then transmit the downlink data to the processor 180 for processing; uplink data may be sent to the base station. Typically, RF circuitry includes, but is not limited to, antennas, at least one amplifier, transceivers, couplers, low noise amplifiers, diplexers, and the like.

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 running software programs or data stored in the memory 120. 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 in the present application may store an operating system and various application programs, and may also store code for performing the methods described in the embodiments of the present application.

An input unit 130 (e.g., 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. In particular, the input unit 130 may include a touch screen 131 disposed at the front of the mobile terminal 100, on or near which touch operations by a user may be collected. The input unit 130 in the present application may receive a touch operation of a user, such as clicking a button, dragging a scroll box, or the like.

The display unit 140 may be used to display information input by a user or information provided to the user and a graphical user interface (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 in this application. 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 input and output functions of the mobile terminal 100, and after integration, the touch screen may be simply referred to as a touch display screen. The display unit 140 may display an application program and corresponding operation steps.

The mobile terminal 100 may further 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 gyroscopes, barometers, hygrometers, thermometers, infrared sensors, and the like.

Audio circuitry 160, speaker 161, microphone 162 may provide an audio interface between a user and mobile terminal 100. The audio circuit 160 may transmit the received electrical signal converted from audio data to the speaker 161, and the speaker 161 converts the electrical signal into a sound signal and outputs the sound signal. The mobile terminal 100 may also be configured 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, which is received by the audio circuit 160 and converted into audio data, which is output to the RF circuit 110 for transmission to, for example, another terminal, or to the memory 120 for further processing. Microphone 162 may capture the voice of the user in this application.

Wi-Fi, which is a short-range wireless transmission technology, can help users to send and receive e-mail, browse web pages, access streaming media, etc. through the Wi-Fi module 170, and provides wireless broadband internet access to users.

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, the processor 180 may include one or more processing units; the processor 180 may also integrate an application processor that primarily handles operating systems, user interfaces, applications, etc., and a baseband processor that primarily handles wireless communications. It will be appreciated that the baseband processor described above may not be integrated into the processor 180. The processor 180 may run an operating system, application programs, user interface displays and touch responses, and the processing methods 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.

181 for exchanging information with other bluetooth devices having bluetooth modules through bluetooth protocol. For example, the mobile terminal 100 may establish a bluetooth connection with a wearable electronic device (e.g., a smart watch) also provided with a bluetooth module through the bluetooth module 181, thereby performing data interaction.

The mobile terminal 100 also includes a power supply 190 (e.g., a battery) that provides power to the various components. The power supply may be logically connected to the processor 180 through a power management system, so that functions of managing charge, discharge, power consumption, etc. are implemented through the power management system. The mobile terminal 100 may also be configured with a power button for powering on and off the terminal, and for locking the screen, etc.

Fig. 2 is a schematic diagram illustrating a user interface on a mobile terminal, such as mobile terminal 100 of fig. 1. In some implementations, a user may open a corresponding application by touching an application icon on the user interface, or may open a corresponding folder by touching a folder icon on the user interface.

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

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

Referring to fig. 3-5, in some implementations, a first thimble contact interface 300 is provided on the back of the body, a second thimble contact interface 400 is provided on the charging peripheral, and after the charging peripheral is mounted on the body, the first thimble contact interface 300 and the second thimble contact interface 400 are electrically connected.

Fig. 6 is a block diagram for illustrating 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 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. In one implementation, the input interface in the body is the first pin contact interface 300 of fig. 3-5 and the output interface in the charging peripheral is the second pin contact interface 400 of 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 mode.

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

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

In one implementation, the first battery charges the second battery during operation of the mobile terminal in the treasured charge mode, and a specific current flow is shown in fig. 8. Meanwhile, the first battery also supplies power for the host in the body.

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

In some implementations, if the first battery and the second battery are both not full, the external charger charges both the first battery and the second battery and also powers the host within 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, when the first battery is not full and the second battery is full, the external charger only charges the first battery and also supplies power to the host in the body.

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

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

In one implementation, if the voltage difference between the first battery and the second battery is detected to be 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; otherwise, when the voltage difference between the first battery and the second battery is larger than or equal to a preset threshold, the mobile terminal works in the treasured charging mode.

In some implementations, the preset threshold Vth of the voltage difference Δv between the first battery and the second battery is set according to the following principle: vth/(rbat1+rbat2+rroad) < Ith. Wherein, rbat1 is the internal resistance value of the second battery in the body, rbat2 is the internal resistance value of the first battery in the charging peripheral equipment, rload is the impedance value on the line, and Ith is the maximum charge-discharge current supported by the first battery. This makes it possible to prevent the current output from the first battery of the charging peripheral device from exceeding the preset current limit protection threshold Ith when the first battery and the second battery are connected in parallel.

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

In an alternative embodiment, as shown in fig. 10, the charging peripheral device 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 switching circuit.

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

In the battery parallel mode, the first processor is configured to control the first switching tube to be turned on and the second switching tube to be turned off. In the treasured that charges mode, first processor is configured to control the second switching tube and switch on, and first switching tube turns off.

The first switching tube and the second switching tube can be NMOS tubes or PMOS tubes.

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

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

In the battery parallel 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 treasured that charges mode, the second processor is configured to control the third switching tube to switch on, and the fourth switching tube switches off.

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

Fig. 11 is a schematic diagram for illustrating a first voltage conversion circuit provided in 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 a first battery. In one implementation, as shown in fig. 11, the first voltage conversion 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 tube Q1, the grid electrode of the second NMOS tube Q2 and the grid electrode of the third NMOS tube 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 tube Q2 and the source electrode of the third NMOS tube Q3 are 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 connected with a battery connection end; the drain electrode of the third NMOS tube Q3 and the other end of the first capacitor C1 are both connected with the ground terminal.

When an external charger is inserted, the first NMOS tube Q1 is conducted, the second NMOS tube Q2 and the third NMOS tube Q3 are alternately conducted and closed, and a voltage reducing circuit is formed by the first NMOS tube Q2 and the third NMOS tube Q3, the voltage reducing circuit and the first inductor L1 and the first capacitor C1, the first battery is charged, and meanwhile, the voltage of the external charger is output to the output end through the first NMOS tube Q1.

When no external charger is inserted, the second NMOS tube Q2, the third NMOS tube Q3, the first inductor L1 and the first capacitor C1 form a reverse boost circuit, and the voltage is output to the first switching circuit through the charging output port, and at the moment, the first NMOS tube Q1 is closed to prevent the voltage from reaching the input end.

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

The working principle of the second voltage conversion circuit is as follows: when the input end is connected with voltage, the fourth NMOS tube Q4 and the fifth NMOS tube Q5 are alternately switched on and off under the action of the second control chip, and the voltage reduction effect is realized by matching with the second inductor L2 and the second capacitor C2 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 buck DC-DC.

Fig. 13 is a block diagram for illustrating 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 device from being too large when the two battery paths are connected in parallel, i.e. in the battery parallel mode, in an alternative embodiment, as shown in fig. 13, the charging peripheral device 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 larger 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: the output current of the battery path in the charging peripheral is monitored in the battery parallel mode to determine whether to maintain or disconnect the battery output path.

Specifically, the current limiting protection threshold, that is, the 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, and in the present invention, the value of Ith is set to 2.5A, and this current limiting value mainly plays the role of abnormal protection and is not exceeded under normal conditions.

Fig. 14 is a schematic diagram for illustrating a current limiting protection circuit provided in 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 to achieve the current limiting purpose by monitoring the current flowing through the sixth NMOS transistor Q6 in real time. The input end of the current limiting protection circuit is used for being connected with the first battery, the output end of the current limiting protection circuit is used for being connected with the 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 the charging peripheral equipment.

The first processor is configured to control the second end and the third end of the first switching circuit to be conducted when receiving the overcurrent signal, and send the overcurrent signal to the second processor; 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 overcurrent signal, namely, control the mobile terminal to work in the treasured charging mode.

Those of ordinary skill in the art will appreciate that: all or part of the steps for implementing the method embodiments described above may be performed by hardware associated with program instructions. The foregoing program may be stored in a computer readable storage medium. The program, when executed, performs steps including the method embodiments described above; and the aforementioned storage medium includes: various media that can store program code, 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 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 principles and spirit of the invention, but such changes and modifications fall 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 battery charger mode;

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

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 the input 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 also includes a second electricity meter for measuring a voltage of a second battery.

6. The mobile terminal of claim 1, wherein the charging peripheral device 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 switching circuit.

8. The mobile terminal of claim 1, wherein the second switching circuit is a single pole double throw switching 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 inductance, and a first capacitance;

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

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;

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