WO2019218821A1 - Dual-battery switching method and circuit, mobile terminal and storage medium - Google Patents

Abstract

The present disclosure provides a dual-battery switching circuit, comprising: a charging management chip, an internal battery power-supply loop, an external battery power-supply loop, a switching circuit, an MCU and an external battery monitoring circuit. An input end of the charging management chip is connected with an output end of the internal battery power-supply loop and an output end of the external battery power-supply loop; an input end of the internal battery power-supply loop is connected with an internal battery, and the internal battery is disposed within a mobile terminal; an input end of the external battery power-supply loop is connected with an external battery, and the external battery is detachably mounted on the mobile terminal; and the external battery monitoring circuit is connected with the external battery and the MCU. The external battery monitoring circuit detects whether the external battery is inserted, and the MCU is self-adaptively switched to the external battery power-supply loop or the internal battery power-supply loop according to an insertion state or a pull-out state of the external battery. Besides, the present disclosure further provides a dual-battery switching method, a mobile terminal and a storage medium.

Description

Dual battery switching method, circuit, mobile terminal and storage medium Technical field

The present disclosure relates to, but is not limited to, the field of battery technology.

Background technique

Today's electronic terminal products are more and more functional, and the power consumption is getting bigger and bigger. Their use and standby time are far from meeting people's requirements. In order to ensure the safety of the user, the battery and the terminal have been integrated into one. When the user goes out, there is no need to bring a spare battery, but it is necessary to use a storage device such as a charging treasure to charge the mobile phone and other devices. The conversion efficiency of the charging treasure is relatively low, and a large part of the stored energy is wasted in the form of heat, and charging using the charging treasure is inconvenient.

The dual-battery power supply scheme has the effect of adding another battery to the product, which causes the product to increase in size, does not conform to the trend of miniaturization of today's products, and the product looks cumbersome. Providing electronic products with a simple power supply solution in addition to their own batteries to extend their use time has become one of the advantages of increasing the competition of electronic products.

Typically, a dual battery powered system is implemented by powering the terminal device using two internal batteries. To this end, the dual battery power supply system includes a first circuit and a second circuit that respectively supply power to the terminal device through two built-in batteries. By detecting the power supply status of the dual battery power supply system, it can be determined which circuit is used to power the system. In addition, the switching of the circuit is controlled by software. However, terminals employing such a dual battery power supply system increase the size and weight and are not convenient to carry.

Summary of the invention

According to an aspect of the present disclosure, a dual battery switching circuit is provided, including a charging management chip, an internal battery power supply circuit, an external battery power supply circuit, a switching circuit, a micro control unit MCU, and an external battery monitoring circuit, wherein the charging management An input end of the chip is connected to an output end of the inner battery power supply circuit and an output end of the outer battery power supply circuit, an input end of the inner battery power supply circuit is connected to the internal battery, and the built-in battery is built in the mobile terminal, An input end of the external battery power supply circuit is connected to an external battery, and the external battery is detachably mounted to the mobile terminal, and the external battery monitoring circuit is connected to the external battery and the MCU, wherein The external battery monitoring circuit is configured to detect whether the external battery is inserted, and the MCU is configured to adaptively switch to the insertion state or the unplugged state of the external battery detected by the external battery monitoring circuit An external battery power supply circuit or the inner battery power supply circuit.

According to another aspect of the present disclosure, there is also provided a dual battery switching method of a mobile terminal, comprising: responsive to an external battery being inserted into the mobile terminal and selectively switching to the external battery, such that the external battery The external battery power supply circuit is turned on to supply power to the mobile terminal by the external battery; and in response to the mobile terminal being disconnected from the external battery, connecting an internal battery power supply circuit of the built-in battery to The built-in battery supplies power to the mobile terminal.

According to another aspect of the present disclosure, there is also provided a mobile terminal comprising a processor and a memory, wherein the memory stores therein a computer program, and when the processor executes the computer program, the processor executes according to The dual battery switching method of the present disclosure.

According to another aspect of the present disclosure, there is also provided a computer readable storage medium having stored thereon one or more computer programs, when the one or more computer programs are executed by one or more processors, One or more processors perform a dual battery switching method in accordance with the present disclosure.

DRAWINGS

1 is a schematic structural diagram of a dual battery switching system according to an embodiment of the present disclosure;

2 is a block diagram of a dual battery switching circuit in accordance with an embodiment of the present disclosure;

3 is a circuit schematic diagram of the inner battery power supply circuit and the inner battery switch control circuit shown in FIG. 2;

4 is a circuit schematic diagram of the external battery power supply circuit and the external battery switch control circuit shown in FIG. 2;

Figure 5 is a circuit schematic diagram of the switching circuit shown in Figure 2;

6 is a circuit schematic diagram of the external battery monitoring circuit shown in FIG. 2;

FIG. 7 is a schematic circuit diagram showing a pull-up potential provided by a built-in battery and a charge management chip;

FIG. 8 is a schematic flow chart of a dual battery switching method according to an embodiment of the present disclosure; FIG.

9 is a schematic diagram of a hardware architecture of a mobile terminal according to an embodiment of the present disclosure;

FIG. 10 is a block diagram showing the dual battery switching procedure shown in FIG. 9.

The implementation, functional features and advantages of the present disclosure will be further described with reference to the accompanying drawings.

Detailed ways

It is understood that the specific embodiments described herein are merely illustrative of the disclosure and are not intended to limit the disclosure.

In the description that follows, the use of elements such as "module," "component," or "unit" is used merely to facilitate the description of the present disclosure, and is not of a specific meaning per se. Therefore, "module", "component" or "unit" can be used in combination.

FIG. 1 is a schematic structural diagram of a dual battery switching system according to an embodiment of the present disclosure.

As shown in FIG. 1, the dual battery switching system may include a mobile terminal 10 and an external battery 20 detachably mounted to the mobile terminal 10, and the mobile terminal 10 may include a built-in battery 11 that powers the mobile terminal 10. The contacts of the external battery 20 are electrically connected to the contacts corresponding to the mobile terminal 10 to provide power to the mobile terminal 10. According to actual needs of use, the mobile terminal 10 can select the internal battery 11 or the external battery 20 to supply power by switching the battery.

In practical application, when the mobile terminal 10 detects electrical connection with the external battery 20, there may be three power supply modes.

Mode 1: The mobile terminal 10 switches to the power supply circuit of the external battery 20, and the external battery 20 supplies power to the mobile terminal 10. When the amount of electric power of the external battery 20 is detected to be lower than a preset value, switching to the power supply circuit of the built-in battery 11 is performed by the built-in battery 11.

Mode 2: The mobile terminal 10 switches to the power supply circuit of the external battery 20, and the external battery 20 supplies power to the mobile terminal 10. When it is detected that the external battery 20 is disconnected from the mobile terminal 10, it is switched to the power supply circuit of the internal battery 11 and is powered by the internal battery 11.

Mode 3: The mobile terminal 10 continues to use the built-in battery 11 to supply power, and when the amount of the built-in battery 11 is lower than a preset value, it switches to the power supply circuit of the external battery 20 to supply power to the mobile terminal 10 from the external battery 20.

In this embodiment, the mobile terminal 20 may include, but is not limited to, a mobile phone, a tablet computer, a notebook computer, a palmtop computer, a personal digital assistant (PDA), a portable media player (Pable Media Player, PMP). ), navigation devices, wearable devices, smart bracelets, pedometers and other mobile terminals.

2 is a block diagram of a dual battery switching circuit in accordance with an embodiment of the present disclosure.

As shown in FIG. 2, the dual battery switching circuit according to the embodiment includes a charging management chip 210, an internal battery power supply circuit 220, an external battery power supply circuit 230, a switching circuit 240, a Microcontroller Unit (MCU) 250, and an external battery. The monitoring circuit 260, the first voltage dividing circuit 270 and the second voltage dividing circuit 280.

The CHGOUT pin of the charge management chip 210 is connected to the inner battery power supply circuit 220 and the outer battery power supply circuit 230, and the inner battery power supply circuit 220 or the outer battery power supply circuit 230 is selectively turned on by the control of the MCU 250. The MCU 250 can control the inner battery power supply circuit 220 and the outer battery power supply circuit 230 to be respectively turned on by the inner battery switch control circuit 221 and the outer battery switch control circuit 231. The internal battery power supply circuit 220 is connected to the internal battery 11, and the external battery power supply circuit 230 is connected to the external battery 20.

The MCU 250 includes GPIO1 to GPIO3 pins and ADC1 to ADC2 pins. The GPIO3 pin is connected to the external battery monitoring circuit 260 for receiving an access signal of the external battery 20 provided by the external battery monitoring circuit 260. The ADC2 pin is connected to the first voltage dividing circuit 270. The GPIO2 pin is connected to the external battery switch control circuit 231. The GPIO1 pin is connected to the internal battery switch control circuit 221. The ADC1 pin is connected to the second voltage dividing circuit 280.

The first voltage dividing circuit 270 is connected to the external battery 20, and the second voltage dividing circuit 280 is connected to the internal battery 11. The built-in battery 11 and the external battery 20 are connected to the ADC1 pin and the ADC2 pin of the MCU 250 via the second voltage dividing circuit 280 and the first voltage dividing circuit 270, respectively, so that the MCU 250 can monitor the built-in battery 11 and the external battery in real time. The state of 20, which in turn determines whether to issue a command to switch the battery-powered circuit.

3 is a circuit schematic diagram of the inner battery power supply circuit 220 and the inner battery switch control circuit 221 shown in FIG. 2.

As shown in FIG. 3, the internal battery power supply circuit 220 includes two PMOS tubes P1 and P2. The first end of the PMOS tube P1 is connected to the anode of the built-in battery 11, and the second end of the PMOS tube P1 is connected to the first end of the PMOS tube P2. connection. The second end of the PMOS transistor P2 is connected to the CHGOUT pin of the charge management chip 210, and the control terminals of the PMOS transistors P1 and P2 are connected to the internal battery switch control circuit 221 via the internal battery power supply loop control node Node1.

By providing two PMOS tubes connected in series, it is possible to avoid charging the built-in battery 11 when the external battery 20 supplies power to the mobile terminal 10, thereby causing a battery power status display error.

In this embodiment, the built-in battery 11 and the CHGOUT pin of the charge management chip 210 simultaneously provide the first pull-up potential PULL UP for the inner battery power supply loop control node Node1 via the second resistor R2, see FIG. 7 to avoid the built-in battery. 11 The built-in battery 11 cannot be charged without power.

The internal battery switch control circuit 221 includes two NMOS transistors N1 and N2, one of which functions as a level shifter and the other NMOS transistor serves as a control. When no external battery 20 is inserted, the control signal from the GPIO1 pin of the MUC is low to turn on the internal battery power supply circuit 220.

According to the embodiment, the inner battery power supply circuit 220 further includes a first resistor R1 and a first capacitor C1. One end of the first resistor R1 is connected to the first end of the PMOS transistor P1, and the other end of the first resistor R1 is connected to the second end of the PMOS transistor P2. One end of the first capacitor C1 is grounded, and the other end is connected to the second end of the PMOS transistor P2.

According to the present embodiment, the internal battery switch control circuit 221 includes NMOS transistors N1 and N2 and third to fifth resistors R3 to R5. One end of the third resistor R3 is connected to the MCU 250 (for example, the GPIO1 pin of the MCU 250), and the other end of the third resistor R3 is connected to the control terminal of the NMOS transistor N1. One end of the fourth resistor R4 is connected to the control terminal of the NMOS transistor N1, and the other end is grounded. The first end of the NMOS transistor N1 is grounded, and the second end of the NMOS transistor N1 is connected to the control terminal of the NMOS transistor N2. One end of the fifth resistor R5 receives the first pull-up potential PULL UP, and the other end is connected to the control terminal of the NMOS transistor N2. The first end of the NMOS transistor N2 is grounded, and the second end of the NMOS transistor N2 is connected to the control terminals of the PMOS transistors P1 and P2 via the internal battery power supply loop control node Node1.

4 is a circuit schematic diagram of the outer battery power supply circuit 230 and the outer battery switch control circuit 231 shown in FIG. 2.

As shown in FIG. 4, the outer battery power supply circuit 230 includes a PMOS transistor P3. The first end of the PMOS transistor P3 is connected to the anode of the external battery 20, the second end of the PMOS transistor P3 is connected to the CHGOUT pin of the charge management chip 210, and the control end of the PMOS transistor P3 is connected to the node Node2 via the external battery power supply loop. The external battery switch control circuit 231 is connected. In the present embodiment, the external battery 20 provides a second pull-up potential for the external battery power supply loop control node Node2 via the sixth resistor R6.

According to the embodiment, the external battery switch control circuit includes an NMOS transistor N3 and a seventh resistor R7 and an eighth resistor R8. One end of the seventh resistor R7 is connected to the MCU 250 (for example, the GPIO2 pin of the MCU 250), and the other end of the seventh resistor R7 is connected to the control terminal of the NMOS transistor N3. One end of the eighth resistor R8 is connected to the control terminal of the NMOS transistor N3, and the other end is grounded. The first end of the NMOS transistor N3 is grounded, and the second end of the NMOS transistor N3 is connected to the control terminal of the PMOS transistor P3 via the external battery power supply loop control node Node2.

FIG. 5 is a circuit schematic diagram of the switching circuit 240 shown in FIG. 2.

As shown in FIG. 5, the switching circuit 240 includes a plurality of NMOS transistors N4 and N5, a ninth resistor R9 to an eleventh resistor R11, and a capacitor C2. One end of the ninth resistor R9 receives the first pull-up potential PULL UP, and the other end of the ninth resistor is connected to the control terminal of the NMOS transistor N$. The first end of the NMOS transistor N4 is grounded, and the second end of the NMOS transistor N4 is connected to the control terminals of the PMOS transistors P1 and P2 of the internal battery power supply circuit 220 via the internal battery power supply loop control node Node1. The first end of the NMOS transistor N5 is grounded, and the second end of the NMOS transistor N5 is connected to the control terminal of the NMOS transistor N4. One end of the tenth resistor R10 is grounded, and the other end is connected to the control end of the NMOS transistor N5. One end of the eleventh resistor R11 is connected to the outer battery power supply circuit 230, and the other end is connected to the control end of the NMOS transistor N5. One end of the second capacitor C2 is grounded, and the other end is connected to the control end of the NMOS transistor N5.

When the external battery 20 is inserted, the NMOS transistor N5 of the switching circuit 240 is turned on, so that the control terminal of the NMOS transistor N4 is grounded, so the switching circuit 240 does not switch, and the internal battery power supply circuit 220 and the external battery power supply circuit 230 are switched. It is software controlled, that is, controlled by the signals provided by the GPIO1 and GPIO2 pins of the MCU 250. When the external battery 20 is suddenly pulled out from the mobile terminal 10, the NMOS transistor N5 is turned off, and the first pull-up potential PULL UP provided by the built-in battery 11 and the CHGOUT pin of the charge management chip 210 causes the NMOS transistor N4 to be guided. And the inner battery power supply loop control node Node1 provides a low level to the control terminals of the PMOS transistors P1 and P2 of the inner battery power supply circuit 220, so that the inner battery power supply circuit 220 is turned on, thereby switching to the inner battery power supply circuit in hardware. 220, so that the device will not lose power when the external battery is unplugged.

According to the present embodiment of the present disclosure, a capacitance having a capacitance value of a micro-level (for example, several tens of μF) may be connected in parallel at the CHGOUT pin of the charge management chip 210, so that the mobile terminal 10 is within a few tens of microseconds during the switching process of the switch. Provide a short-lived current. By the switching circuit 240, the external battery 20 can be used to supply power to the mobile terminal 10 anytime and anywhere.

6 is a circuit schematic diagram of the external battery monitoring circuit shown in FIG. 2.

As shown in FIG. 6, the external battery monitoring circuit 260 includes an NMOS transistor N6 and a twelfth resistor R12. One end of the twelfth resistor R12 is connected to the MCU 250 (for example, the GPIO3 pin of the MCU 250), and the other end is connected to the second end of the NMOS transistor N6. The first end of the NMOS transistor N6 is grounded, and the control terminal of the NMOS transistor N6 is connected to the external battery 20. When the external battery 20 is inserted, the external battery monitoring circuit 260 outputs a low level, and the MCU 250 can detect whether or not the external battery 20 is inserted according to the level change.

According to the dual battery switching system of the present embodiment, whether the external battery 20 is inserted is monitored by the external battery monitoring circuit 260. When the external battery 20 is inserted, the external battery monitoring circuit 260 generates a low level and transmits it to the MCU 250 to enable the MCU. The control 250 supplies power to the charging management chip 210 from the internal battery power supply circuit 220 or the external battery power supply circuit 230. When the external battery 20 is pulled out from the mobile terminal 10, the switching circuit 240 turns on the internal battery power supply circuit 220, thereby achieving no Sew switch. With the dual battery switching system of the embodiment of the present disclosure, the power supply can be adaptively switched between the internal battery 11 and the external battery 20, and in the case of a sudden disconnection from the external battery 220, the battery is quickly switched to the internal battery. Loop 220 is suitable for a variety of application scenarios.

FIG. 8 is a schematic flow chart of a dual battery switching method according to an embodiment of the present disclosure.

As shown in FIG. 8, the dual battery switching method according to the present embodiment includes steps 710 to 770.

In step 710, it is determined whether the external battery is inserted into the mobile terminal; if yes, the process proceeds to step 720; if not, the process returns to step 710 to continue the determination.

At step 720, it is determined whether the internal battery is selected for power supply or the external battery is selected for power supply. When the internal battery power supply is selected, the process proceeds to step 730, and when the external battery power supply is selected, the process proceeds to step 750.

At step 730, the internal battery power supply loop of the internal battery is turned on.

In step 740, it is determined whether the power of the built-in battery is lower than the first preset value; if yes, the process proceeds to step 750; if not, then returns to step 740 to continue the determination.

At step 750, the external battery power supply loop of the external battery is turned on.

At step 760, it is detected whether it is disconnected from the external battery; if so, then proceeds to step 730, and if not, proceeds to step 770.

In step 770, it is determined whether the power of the external battery is lower than the second preset value; if yes, the process proceeds to step 730; if not, the process returns to step 760.

When the mobile terminal supplies power through the built-in battery, it can detect in real time or detect whether to insert an external battery every preset time period. Based on different usage scenarios and settings, there are two types of power supply when there is an external battery inserted, that is, continue to be powered by the built-in battery, or switch to an external battery.

When the selection continues to be powered by the internal battery, keep the internal battery power circuit open. In this case, it is determined in real time whether the power of the internal battery is lower than the first preset value, and if so, switching to the external battery power supply, that is, the external battery power supply circuit is turned on and the internal battery power supply circuit is disconnected.

When the power is selected to be supplied from an external battery, the external battery power supply circuit is turned on. In this case, on the one hand, it is detected whether the external battery is pulled out, and on the other hand, it is judged whether the external battery is lower than the second preset value, when the external battery is pulled out or the external battery is lower than the first battery. When the preset value is two, the battery is switched to the internal battery, that is, the internal battery power supply circuit is turned on and the external battery power supply circuit is disconnected, wherein when the external battery is pulled out, the internal circuit is powered by the switching circuit hardware. The loop is turned on. In this embodiment, the second preset value may be the same as the first preset value, or may be different from the first preset value, which is not specifically limited in the disclosure.

In this embodiment, if the internal battery power supply circuit of the built-in battery is turned on, the external battery power supply circuit of the external battery is automatically disconnected. Similarly, if the external battery power supply circuit of the external battery is turned on, the automatic The internal battery power supply circuit of the built-in battery is disconnected.

It can be understood by those skilled in the art that the order of the steps in the embodiment can be adjusted according to the actual application, and the disclosure does not specifically limit this.

According to the dual battery switching method of the embodiment, the switching between the internal battery power supply circuit and the external battery power supply circuit is controlled by monitoring whether an external battery is inserted, and the switch is quickly switched back to the built-in battery when the external battery is suddenly disconnected. Battery for a variety of application scenarios.

9 is a schematic diagram of a hardware architecture of a mobile terminal in accordance with an embodiment of the present disclosure.

As shown in FIG. 9, a mobile terminal in accordance with an embodiment of the present disclosure includes a memory 810, a processor 820, and a dual battery switching program 830 stored on the memory 810 and operable on the processor 820. In the present embodiment, dual battery switching program 830 includes a series of computer program instructions stored on memory 810 that, when executed by processor 820, can implement a dual battery switching method in accordance with various embodiments of the present disclosure.

In some embodiments, the dual battery switching procedure 830 can include one or more modules based on the particular operations implemented by the various portions of the computer program instructions. FIG. 10 is a block diagram showing the dual battery switching procedure shown in FIG. 9.

As shown in FIG. 10, the dual battery switching program 830 includes a determination module 910 and a connection module 920.

The determining module 910 is configured to determine whether the external battery is inserted into the mobile terminal; if yes, further determine whether to select the internal battery to supply power or select an external battery to supply power.

The connection module 920 is configured to turn on the internal battery power supply circuit of the internal battery when the internal battery is selected for power supply, and to turn on the external battery power supply circuit of the external battery when the external battery is selected for power supply.

The determining module 910 is further configured to determine whether the power of the built-in battery is lower than the first preset value when the battery is powered by the built-in battery; if yes, the connection module 920 turns on the external battery power supply loop of the external battery, otherwise continues to remain The internal battery power supply circuit of the built-in battery is turned on.

The determining module 910 is further configured to detect whether the external battery is disconnected when the external battery is powered; if so, the connection module 920 turns on the internal battery power supply circuit of the built-in battery, otherwise the external battery is kept outside. The battery power circuit is turned on.

The determining module 910 is further configured to determine whether the power of the external battery is lower than a second preset value when the external battery is powered; if yes, the connection module 920 turns on the internal battery power supply loop of the built-in battery; The external battery power supply circuit of the external battery is turned on.

When the mobile terminal supplies power through the built-in battery, the determining module 910 can detect in real time or detect whether to insert an external battery every preset time period. Based on different usage scenarios and settings, there may be two power supply situations when there is an external battery inserted, that is, continue to be powered by the built-in battery, or switch to external battery power supply, which requires the determination module 910 to further judge and select by The built-in battery is also powered by an external battery.

When the judging module 910 selects to be powered by the built-in battery, the connection module 920 keeps the internal battery power supply loop conducting. In this case, the determining module 910 determines in real time whether the power of the internal battery is lower than the first preset value, and if so, the connection module 920 switches to the external battery power supply, that is, the external battery power supply circuit is turned on and the internal battery is powered. The loop is broken.

When the judging module 910 selects to be powered by an external battery, the connection module 920 turns on the outer battery power supply loop. In this case, the determining module 910 detects whether the external battery is pulled out on the one hand, and determines whether the external battery is lower than the second preset value on the other hand, when the external battery is pulled out or the external battery is discharged. When the second preset value is lower, the connection module 920 switches to the internal battery power supply, that is, the internal battery power supply circuit is turned on and the external battery power supply circuit is disconnected, wherein when the external battery is pulled out, the switching circuit is The internal battery power supply circuit is electrically turned on. In this embodiment, the second preset value may be the same as the first preset value, or may be different from the first preset value, which is not specifically limited in the disclosure.

In this embodiment, if the connection module 920 turns on the internal battery power supply circuit of the built-in battery, the external battery power supply circuit of the external battery is automatically disconnected. Similarly, if the connection module 920 is used to power the external battery of the external battery. When the loop is turned on, the internal battery power supply circuit of the internal battery is automatically disconnected.

According to the mobile terminal of the embodiment, by the determining module 910 monitoring whether an external battery is inserted, the connection module 920 controls the switching between the internal battery power supply circuit and the external battery power supply circuit, and in the case of a sudden disconnection from the external battery, Quickly switch back to the internal battery for a variety of application scenarios.

Embodiments of the present disclosure also provide a computer readable storage medium having stored thereon one or more computer programs, the one or more computer programs being executed by one or more processors, the one or more The processor performs a dual battery switching method in accordance with various embodiments of the present disclosure.

The computer readable storage medium may include volatile memory, such as random access memory; the memory may also include non-volatile memory, such as read only memory, flash memory, hard disk or solid state drive; the memory may also include a memory of the kind described above The combination. It is to be understood that the term "comprises", "comprising", or any other variants thereof, is intended to encompass a non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes those elements. It also includes other elements that are not explicitly listed, or elements that are inherent to such a process, method, article, or device. An element that is defined by the phrase "comprising a ..." does not exclude the presence of additional equivalent elements in the process, method, item, or device that comprises the element.

The embodiments of the present disclosure have been described above with reference to the drawings, but the present disclosure is not limited to the specific embodiments described above, and the specific embodiments described above are merely illustrative and not restrictive, and those skilled in the art In the light of the present disclosure, many forms may be made without departing from the spirit of the present disclosure, and these are all within the protection of the present disclosure.

Claims (19)

A dual battery switching circuit includes a charging management chip, an internal battery power supply circuit, an external battery power supply circuit, a switching circuit, a micro control unit MCU, and an external battery monitoring circuit, wherein An input end of the charge management chip is connected to an output end of the inner battery power supply circuit and an output end of the outer battery power supply circuit, The input end of the inner battery power supply circuit is connected to the built-in battery, and the built-in battery is built in the mobile terminal, An input end of the outer battery power supply circuit is connected to an external battery, and the external battery is detachably mounted to the mobile terminal, and The external battery monitoring circuit is connected to the external battery and the MCU, Wherein the external battery monitoring circuit is configured to detect whether the external battery is inserted, and the MCU is configured to adaptively switch according to an insertion state or an extraction state of the external battery detected by the external battery monitoring circuit. To the outer battery power supply circuit or the inner battery power supply circuit. The dual battery switching circuit according to claim 1, further comprising an internal battery switch control circuit and an external battery switch control circuit, wherein The internal battery switch control circuit is connected between the inner battery power supply circuit and the MCU, and The external battery switch control circuit is coupled between the outer battery power supply circuit and the MCU. The dual battery switching circuit according to claim 2, further comprising a first voltage dividing circuit and a second voltage dividing circuit, The first voltage dividing circuit is connected between the external battery and the MCU, and the second voltage dividing circuit is connected between the internal battery and the MCU connection. The dual battery switching circuit according to claim 2, wherein In response to the outer battery monitoring circuit detecting the insertion of the external battery, the MCU controls the charge management chip to be connected to the inner battery power supply circuit or the outer battery power supply circuit, and The MCU controls the internal battery switch control circuit to turn on the inner battery power supply circuit in response to the outer battery monitoring circuit detecting the pullout of the external battery, and the switching circuit will perform the charge management The chip is electrically connected to the inner battery power supply circuit. The dual battery switching circuit of claim 2, wherein the inner battery power supply circuit comprises a first PMOS transistor and a second PMOS transistor, The first end of the first PMOS transistor is connected to the anode of the internal battery, the second end of the first PMOS transistor is connected to the first end of the second PMOS transistor, and the second PMOS transistor The second end is connected to the charging management chip, and the control end of the first PMOS transistor and the control end of the second PMOS transistor are connected to the internal battery switch control circuit via an internal battery power supply loop control node. The dual battery switching circuit of claim 5, wherein the inner battery power supply circuit further comprises a first resistor and a first capacitor, Wherein one end of the first resistor is connected to the first end of the first PMOS tube, and the other end of the first resistor is connected to the second end of the second PMOS tube, and One end of the first capacitor is grounded, and the other end of the first capacitor is connected to the second end of the second PMOS transistor. The dual battery switching circuit according to claim 5, wherein said internal battery power supply loop control node is supplied with a first pull-up potential by said internal battery and said charge management chip via said second resistor. The dual battery switching circuit according to claim 7, wherein the internal battery switch control circuit comprises a first NMOS transistor and a second NMOS transistor, and a third to fifth resistor, One end of the third resistor is connected to the MCU, and the other end of the third resistor is connected to the control end of the first NMOS transistor. One end of the fourth resistor is connected to the control end of the first NMOS transistor, and the other end of the fourth resistor is grounded. The first end of the first NMOS transistor is grounded, and the second end of the first NMOS transistor is connected to the control end of the second NMOS transistor. One end of the fifth resistor receives the first pull-up potential, and the other end of the fifth resistor is connected to a control end of the second NMOS transistor, and The first end of the second NMOS transistor is grounded, and the second end of the second NMOS transistor is controlled by the inner battery power supply loop control node and the control end of the first PMOS transistor and the second PMOS transistor End connection. The dual battery switching circuit of claim 2, wherein the outer battery power supply circuit comprises a third PMOS transistor, The first end of the third PMOS transistor is connected to the anode of the external battery, the second end of the third PMOS transistor is connected to the charging management chip, and the control end of the third PMOS transistor The external battery power supply loop control node is connected to the external battery switch control circuit. The dual battery switching circuit of claim 9 wherein said external battery provides a second pull-up potential to said external battery supply loop control node via said sixth resistor. The dual battery switching circuit according to claim 10, wherein said external battery switch control circuit comprises a third NMOS transistor and a seventh resistor and an eighth resistor, The one end of the seventh resistor is connected to the MCU, and the other end of the seventh resistor is connected to the control end of the third NMOS tube. One end of the eighth resistor is connected to a control end of the third NMOS transistor, and the other end of the eighth resistor is grounded, and The first end of the third NMOS transistor is grounded, and the second end of the third NMOS transistor is connected to the control end of the third PMOS transistor via the external battery power supply loop control node. The dual battery switching circuit according to claim 7, wherein the switching circuit comprises a fourth NMOS transistor, a fifth NMOS transistor, a ninth resistor to an eleventh resistor, and a second capacitor, Wherein, one end of the ninth resistor receives the first pull-up potential, and the other end of the ninth resistor is connected to a control end of the fourth NMOS transistor, The first end of the fourth NMOS transistor is grounded, and the second end of the fourth NMOS transistor is controlled by the inner battery power supply loop control node and the control end of the first PMOS transistor and the second PMOS transistor End connection, The first end of the fifth NMOS transistor is grounded, and the second end of the fifth NMOS transistor is connected to the control end of the fourth NMOS transistor. One end of the tenth resistor is grounded, and the other end of the tenth resistor is connected to a control end of the fifth NMOS transistor. One end of the eleventh resistor is connected to the outer battery power supply loop, and the other end of the eleventh resistor is connected to the control end of the fifth NMOS transistor, and One end of the second capacitor is grounded, and the other end of the second capacitor is connected to a control end of the fifth NMOS transistor. The dual battery switching circuit according to claim 1, wherein said external battery monitoring circuit comprises a sixth NMOS transistor and a twelfth resistor, Wherein one end of the twelfth resistor is connected to the MCU, and the other end of the twelfth resistor is connected to the second end of the sixth NMOS tube, and The first end of the sixth NMOS transistor is grounded, and the control end of the sixth NMOS transistor is connected to the external battery. The dual battery switching circuit according to claim 3, wherein the MCU comprises a GPIO1 pin, a GPIO2 pin, a GPIO3 pin, an ADC1 pin, and an ADC2 pin. The GPIO3 pin is connected to the external battery monitoring circuit for receiving an external battery access signal provided by the external battery monitoring circuit. The GPIO1 pin is connected to the internal battery switch control circuit, The GPIO2 pin is connected to the external battery switch control circuit, The ADC1 pin is connected to the second voltage dividing circuit, and The ADC2 pin is connected to the first voltage dividing circuit. A dual battery switching method for a mobile terminal, comprising: Inserting an external battery into the mobile terminal and selecting to switch to the external battery such that an external battery power supply loop of the external battery is turned on to power the mobile terminal by the external battery; In response to the mobile terminal being disconnected from the external battery, an internal battery power supply loop of the internal battery is turned on to supply power to the mobile terminal by the internal battery. The dual battery switching method according to claim 15, further comprising: Determining whether the power of the internal battery is lower than a preset value in response to the external battery being inserted into the mobile terminal and selecting to continue to supply power to the mobile terminal by the internal battery; The external battery power supply loop of the external battery is turned on in response to the power of the internal battery being lower than a preset value to supply power to the mobile terminal by the external battery. The dual battery switching method according to claim 15, wherein after the step of powering the mobile terminal by the external battery, the method further comprises: Determining whether the amount of power of the external battery is lower than a preset value; The internal battery power supply loop of the internal battery is turned on in response to the power of the external battery being lower than a preset value to supply power to the mobile terminal by the internal battery. A mobile terminal includes a processor and a memory, wherein A computer program is stored in the memory, and when the processor executes the computer program, the processor performs the dual battery switching method according to any one of claims 15 to 17. A computer readable storage medium having stored thereon one or more computer programs, the one or more computer programs being executed by one or more processors, the one or more processors executing according to claim 15. The dual battery switching method according to any one of the preceding claims.

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