Power supply switching hardware circuits, power supply circuits and electronic equipment

Abstract

The present invention proposes a power supply switching hardware circuit, a power supply circuit, and an electronic device. The power supply switching hardware circuit includes: a first switch circuit, connected between an internal power supply interface and a whole-machine power supply interface, which connects the power supply path between the internal power supply and the whole machine after the internal power supply is turned on, thereby realizing whole-machine power supply by the internal power supply; a second switch circuit, connected between an external power supply interface and the whole-machine power supply interface, which connects the power supply path between the external power supply and the whole machine after the external power supply is turned on, thereby realizing whole-machine power supply by the external power supply; and a switching control circuit, connected between the first switch circuit and the second switch circuit, for controlling the connection and disconnection of the first switch circuit, thereby realizing isolation between the external power supply and the internal power supply. The present invention uses a pure hardware circuit to solve the problem of working switching logic conflict when the external power supply and the internal power supply of the device are turned on at the same time, and the response is fast.

Description

Technical Field

[0001] The present invention relates to the technical field of power supplies, and in particular to a power supply switching hardware circuit, a power supply circuit and an electronic device. Background Art

[0002] As people's living standards improve, portable devices are increasingly used. These devices typically have internal rechargeable power modules. When used outdoors, without an external power source, the device can be powered by the internal rechargeable power module to meet operational needs. When used indoors, the device can be powered by an external power source to simultaneously charge the internal rechargeable power module and maintain reusability. However, when both the external and internal power sources are active at the same time, a conflict in switching logic may occur.

[0003] Therefore, how to manage the working modes of the two modules after the external power supply and the internal rechargeable power module are connected at the same time to avoid conflicts in voltage, current, logic, etc. is of great significance to portable devices. Summary of the Invention

[0004] The embodiments of the present invention provide a power switching hardware circuit, a power supply circuit, and an electronic device to solve the problem in the prior art that a working switching logic conflict occurs when both an external power supply and an internal power supply of a portable device are turned on at the same time.

[0005] The power supply switching hardware circuit provided by the embodiment of the present invention includes a first switch circuit, a second switch circuit, and a switch control circuit, wherein:

[0006] The first switch circuit is connected between the internal power supply interface and the whole machine power supply interface, and is used to connect the power supply path between the internal power supply and the whole machine after the internal power supply is turned on, so as to realize the whole machine power supply of the internal power supply;

[0007] The second switch circuit is connected between the external power supply interface and the whole machine power supply interface, and is used to connect the power supply path between the external power supply and the whole machine after the external power supply is turned on, so as to realize the whole machine power supply of the external power supply;

[0008] The switching control circuit is connected between the first switch circuit and the second switch circuit, and is used to control the connection and disconnection of the first switch circuit to achieve isolation between the external power supply and the internal power supply.

[0009] Optionally, the switching control circuit is specifically configured to disconnect the power supply path between the internal power supply and the entire device when the second switch circuit connects the power supply path between the external power supply and the entire device.

[0010] Optionally, the power supply switching hardware circuit further includes an MCU main control module, which is used to turn off the internal power supply when the switching control circuit disconnects the power supply path between the internal power supply and the entire machine.

[0011] Optionally, the first switching circuit includes a first field effect transistor, a second field effect transistor, a first transistor, a first resistor, a second resistor and a third resistor, the S poles of the first field effect transistor and the second field effect transistor are connected, the D pole of the first field effect transistor is connected to the internal power supply interface, the D pole of the second field effect transistor is connected to the power supply interface of the whole machine, the first resistor and the second resistor form a series branch, one end of the first resistor is connected to the S poles of the first field effect transistor and the second field effect transistor respectively, and the other end is connected to the G poles of the first field effect transistor and the second field effect transistor respectively, the other end of the second resistor is connected to the collector of the first transistor, the third resistor is connected between the S pole of the first field effect transistor and the base of the first transistor, and the emitter of the first transistor is grounded.

[0012] Optionally, the second switching circuit includes a third field-effect transistor, a fourth field-effect transistor, a second triode, a fourth resistor, a fifth resistor and a sixth resistor, the S poles of the third field-effect transistor and the fourth field-effect transistor are connected, the D pole of the third field-effect transistor is connected to the external power supply interface, the D pole of the fourth field-effect transistor is connected to the power supply interface of the whole machine, the fourth resistor and the fifth resistor form a series branch, one end of the fourth resistor is connected to the S poles of the third field-effect transistor and the fourth field-effect transistor respectively, and the other end is connected to the G poles of the third field-effect transistor and the fourth field-effect transistor respectively, the other end of the fifth resistor is connected to the collector of the second triode, the sixth resistor is connected between the D pole of the third field-effect transistor and the base of the second triode, and the emitter of the second triode is grounded.

[0013] Optionally, the switching control circuit includes a third transistor and a seventh resistor, one end of the seventh resistor is connected to the D pole of the third field-effect transistor, and the other end is connected to the base of the third transistor, the collector of the third transistor is connected to the base of the first transistor, and the emitter of the third transistor is grounded.

[0014] Optionally, the power supply switching hardware circuit also includes an internal power supply charging switch circuit, which is connected to the switching control circuit and is used to control the switching control circuit to stop working according to the charging control signal of the MCU main control module, so that when the second switch circuit connects the power supply path between the external power supply and the whole machine, the charging path between the external power supply and the internal power supply is also connected.

[0015] Optionally, the internal power supply charging switch circuit includes a fourth transistor and an eighth resistor, the eighth resistor is connected between the control interface of the MCU main control module and the base of the fourth transistor, the collector of the fourth transistor is connected to the control input end of the switching control circuit, and the emitter of the fourth transistor is grounded.

[0016] Optionally, the internal power supply charging switch circuit is further used to resume operation of the switching control circuit according to a stop charging signal from the MCU main control module, so as to disconnect the charging path between the external power supply and the internal power supply.

[0017] An embodiment of the present invention further provides a power supply circuit, comprising the power supply switching hardware circuit described above.

[0018] An embodiment of the present invention further provides an electronic device, including the power supply circuit described above.

[0019] The power supply switching hardware circuit, power supply circuit and electronic device provided in the embodiments of the present invention use pure hardware circuits to realize automatic switching between external power supply and internal power supply. This not only solves the problem of working switching logic conflict when the external power supply and internal power supply of portable devices are turned on at the same time, reduces the control of the main control MCU, and makes the hardware response faster, but also reduces the design of power management chips, controller chips and software logic, thereby reducing the cost of the power supply circuit.

[0020] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are specifically listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present invention. The same reference symbols are used throughout the drawings to represent the same components. In the drawings:

[0022] Figure 1 A structural block diagram of a power supply switching hardware circuit provided by an embodiment of the present invention;

[0023] Figure 2 A circuit schematic diagram of a power supply switching hardware circuit provided in an embodiment of the present invention;

[0024] Figure 3 A structural block diagram of a power supply switching hardware circuit provided by another embodiment of the present invention;

[0025] Figure 4A circuit schematic diagram of a power supply switching hardware circuit provided in another embodiment of the present invention. DETAILED DESCRIPTION

[0026] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0027] Those skilled in the art will understand that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by those skilled in the art in the art to which the present invention pertains. It should also be understood that terms such as those defined in common dictionaries should be understood to have meanings consistent with those in the context of the prior art and, unless specifically defined, will not be interpreted in an idealized or overly formal sense.

[0028] Figure 1 This is a structural block diagram of a power supply switching hardware circuit provided by an embodiment of the present invention. Figure 1 As shown, the power supply switching hardware circuit provided by the embodiment of the present invention includes a first switch circuit 10, a second switch circuit 20 and a switch control circuit 30, wherein:

[0029] The first switch circuit 10 is connected between the internal power supply interface J2 and the whole machine power supply interface VCC-IN, and is used to connect the power supply path between the internal power supply and the whole machine after the internal power supply is turned on, so as to realize the whole machine power supply of the internal power supply;

[0030] The second switch circuit 20 is connected between the external power supply interface J1 and the whole machine power supply interface VCC-IN, and is used to connect the power supply path between the external power supply and the whole machine after the external power supply is turned on, so as to realize the whole machine power supply of the external power supply;

[0031] The switching control circuit 30 is connected between the first switch circuit 10 and the second switch circuit 20 and is used to control the connection and disconnection of the first switch circuit 10 to achieve isolation between the external power supply and the internal power supply.

[0032] Specifically, the switching control circuit is specifically configured to disconnect the power supply path between the internal power supply and the entire device when the second switch circuit 20 connects the power supply path between the external power supply and the entire device.

[0033] In this embodiment, the power supply switching hardware circuit further includes an MCU main control module, which is used to turn off the internal power supply when the switching control circuit 30 disconnects the power supply path between the internal power supply and the entire device.

[0034] The power supply switching hardware circuit provided in the embodiment of the present invention uses a pure hardware circuit to realize automatic switching between external power supply and internal power supply. It not only solves the problem of working switching logic conflict when the external power supply and internal power supply of the portable device are turned on at the same time, reduces the control of the main control MCU, and makes the hardware response faster, but also reduces the design of power management chips, controller chips and software logic, thereby reducing the cost of the power supply circuit.

[0035] In the embodiment of the present invention, after the power supply path between the internal power supply and the whole machine is cut off, the whole machine MCU main control module can communicate with the internal MCU of the battery to shut down the battery output state, thereby further ensuring the isolation of the external power supply and the internal power supply.

[0036] In a specific embodiment, Figure 2 As shown, the first switching circuit 10 specifically includes a first field effect transistor U3, a second field effect transistor U4, a first transistor Q1, a first resistor R5, a second resistor R3 and a third resistor R8. The S poles of the first field effect transistor U3 and the second field effect transistor U4 are connected, the D pole of the first field effect transistor U3 is connected to the internal power supply interface J2, and the D pole of the second field effect transistor U4 is connected to the whole machine power supply interface VCC-IN. The first resistor R5 and the second resistor R3 form a series branch. One end of the first resistor R5 is connected to the S poles of the first field effect transistor U3 and the second field effect transistor U4, respectively, and the other end is connected to the G poles of the first field effect transistor U3 and the second field effect transistor U4, respectively. The other end of the second resistor R3 is connected to the collector of the first transistor Q1. The third resistor R8 is connected between the S pole of the first field effect transistor U3 and the base Q1 of the first transistor, and the emitter of the first transistor Q1 is grounded.

[0037] Among them, the second switching circuit 20 specifically includes a third field-effect transistor U6, a fourth field-effect transistor U1, a second transistor Q5, a fourth resistor R1, a fifth resistor R2 and a sixth resistor R12. The S poles of the third field-effect transistor U6 and the fourth field-effect transistor U1 are connected, the D pole of the third field-effect transistor U6 is connected to the external power supply interface J1, and the D pole of the fourth field-effect transistor U1 is connected to the power supply interface of the entire device. The fourth resistor R1 and the fifth resistor R2 form a series branch. One end of the fourth resistor R1 is connected to the S poles of the third field-effect transistor U6 and the fourth field-effect transistor U1 respectively, and the other end is connected to the G poles of the third field-effect transistor U6 and the fourth field-effect transistor U1 respectively. The other end of the fifth resistor R2 is connected to the collector of the second transistor Q5. The sixth resistor R12 is connected between the D pole of the third field-effect transistor U6 and the base of the second transistor Q5. The emitter of the second transistor Q5 is grounded.

[0038] Among them, the switching control circuit 30 specifically includes a third transistor Q2 and a seventh resistor, one end of the seventh resistor R6 is connected to the D pole of the third field-effect transistor U6, and the other end is connected to the base of the third transistor Q2, the collector of the third transistor Q2 is connected to the base of the first transistor Q1, and the emitter of the third transistor Q2 is grounded.

[0039] In this specific embodiment, J1 is an external power input port, such as an adapter, etc., and J2 is a power supply port for a rechargeable power module inside a portable device, such as a battery, a power bank, etc. This port includes but is not limited to a communication interface, a detection interface, and a power interface; wherein, the first field-effect transistor U3, the second field-effect transistor U4, the third field-effect transistor U6, and the fourth field-effect transistor U1 are P-channel field-effect transistors, and the first transistor Q1, the second transistor Q5, and the third transistor Q2 are NPN transistors.

[0040] Specifically, when the external power supply is not connected:

[0041] The internal power supply module, i.e., the internal power supply, is connected to the entire device through port J2. After the power is turned on, the S pole of the first field-effect transistor U3 is charged through the unidirectional conduction characteristic of the body diode of the first field-effect transistor U3. The S pole is connected to the base of the transistor Q1 through the third resistor R8, so that the transistor Q1 is turned on. After the transistor Q1 is turned on, the second resistor R3 and the first resistor R5 form a series branch. The G poles of the first field-effect transistor U3 and the second field-effect transistor U4 are connected to the intersection of the second resistor R3 and the first resistor R5. The G and S poles are respectively connected to the two ends of the first resistor R5. After voltage division by the first resistor R5, the turn-on conditions of the first field-effect transistor U3 and the second field-effect transistor U4 are met. The first field-effect transistor U3 and the second field-effect transistor U4 are turned on, and the battery voltage is connected to VCC-IN through the first field-effect transistor U3 and the second field-effect transistor U4 to power the entire device.

[0042] Specifically, when the external power supply is turned on:

[0043] The external power supply is connected to the entire device through port J1, and the base of the transistor Q5 is powered through the sixth resistor R12, so that the transistor is turned on. At the same time, the S pole of the third field effect transistor U6 is charged through the body diode of the third field effect transistor U6, and then the voltage is divided by the fourth resistor R1 and the fifth resistor R2, so that the third field effect transistor U6 and the fourth field effect transistor U1 are turned on. The external power supply is connected to VCC-IN to power the entire device.

[0044] At the same time, the third transistor Q2 is driven by the seventh resistor R6 to be turned on. After the third transistor Q2 is turned on, the collector of the third transistor Q2 is pulled down to a low level. The collector of the third transistor Q2 is connected to the base of the first transistor Q1, and the base of the first transistor Q1 is synchronously pulled down to a low level. The first transistor Q1 is turned off. After the first transistor Q1 is turned off, the first field effect transistor U3 and the second field effect transistor U4 do not meet the turn-on conditions. The first field effect transistor U3 and the second field effect transistor U4 are turned off, and the power supply path between the battery and the whole machine is cut off. At this time, the whole machine is powered by an external power supply, and the external power supply is isolated from the internal power supply.

[0045] After the battery power supply is cut off, the main control MCU of the whole machine can communicate with the internal MCU of the battery to shut down the battery output state, further ensuring the isolation of the external power supply and the internal power supply.

[0046] like Figure 3 As shown, the power supply switching hardware circuit also includes an internal power charging switch circuit 40, which is connected to the switching control circuit 30 and is used to control the switching control circuit 30 to stop working according to the charging control signal IO-CONTROL of the MCU main control module, so that when the second switch circuit 20 connects the power supply path between the external power supply and the whole machine, the charging path between the external power supply and the internal power supply is also connected.

[0047] In a specific embodiment, Figure 4 As shown, the internal power charging switch circuit 40 includes a fourth transistor Q3 and an eighth resistor R7, wherein the fourth transistor Q3 is an NPN transistor, and the eighth resistor R7 is connected between the control interface of the MCU main control module and the base of the fourth transistor Q3, the collector of the fourth transistor Q3 is connected to the control input end of the switching control circuit, that is, the base of the third transistor, and the emitter of the fourth transistor Q3 is grounded.

[0048] Furthermore, the internal power supply charging switch circuit 40 is also used to resume the operation of the switching control circuit according to the charging stop signal of the MCU main control module, so as to disconnect the charging path between the external power supply and the internal power supply.

[0049] In this embodiment, specifically, if the internal power supply needs to be charged, the IO-CONTROL is set to a high level through the MCU inside the entire device, so that the fourth transistor Q3 is turned on. After the fourth transistor Q3 is turned on, the collector of the fourth transistor Q3 is pulled down to a low level, and the collector of the fourth transistor Q3 is connected to the base of the third transistor Q2. The base of the third transistor Q2 is pulled down to a low level, and the third transistor Q2 is turned off. The base of the first transistor Q1 recovers from a low level state to a high level, and the first transistor Q1 is turned on. At this time, the fourth field-effect transistor U1 is in an on state, the VCC-IN node is the external power supply voltage, and through the unidirectional conduction characteristic of the body diode of the second field-effect transistor U4, the S pole of the second field-effect transistor U4 is at a high level, and the S pole is connected to the third resistor R8. At this time, the first transistor Q1 is turned on, the first field-effect transistor U3 and the second field-effect transistor U4 are turned on, and the external power supply voltage is connected to the internal power supply interface J2 through the fourth field-effect transistor U1, the first field-effect transistor U3, and the second field-effect transistor U4, thereby charging the internal rechargeable power supply.

[0050] After the battery is fully charged, IO-CONTROL is set to a low level through the MCU, the fourth transistor Q3 is turned off, the third transistor Q2 is restored to the on state, the first transistor Q1 is restored to the off state, the first field effect transistor U3 and the second field effect transistor U4 are turned off, and the external power supply is disconnected from the battery.

[0051] Specifically, unplug the external power supply:

[0052] When the external power supply is unplugged, the external power supply interface is disconnected from the external power supply, the port has no voltage, the fourth field effect transistor U1 is turned off, and at the same time, due to the voltage being disconnected, the base of the third transistor Q2 has no driving voltage, the third transistor Q2 is turned off, the pull-down state of the base of the first transistor Q1 is cancelled, and the normal state is restored. The third resistor R8 is connected to the S pole of the first field effect transistor U3, the first transistor Q1 is turned on, and thus the first field effect transistor U3 and the second field effect transistor U4 are turned on, and the battery voltage is reconnected to VCC-IN to power the entire device.

[0053] In summary, this circuit realizes seamless switching between external power supply and internal power supply, and only requires hardware circuits to complete it without relying on software logic, which has faster response speed and lower cost.

[0054] In addition, an embodiment of the present invention further provides a power supply circuit, including the power supply switching hardware circuit described above. The specific implementation of the power supply switching hardware circuit is as follows: Figure 1-4 As shown in any embodiment.

[0055] In addition, an embodiment of the present invention further provides an electronic device, including the power supply circuit described above.

[0056] The power supply switching hardware circuit, power supply circuit and electronic device provided in the embodiments of the present invention use pure hardware circuits to realize automatic switching between external power supply and internal power supply. This not only solves the problem of working switching logic conflict when the external power supply and internal power supply of portable devices are turned on at the same time, reduces the control of the main control MCU, and makes the hardware response faster, but also reduces the design of power management chips, controller chips and software logic, thereby reducing the cost of the power supply circuit.

[0057] In the description of the present invention, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures, and techniques are not shown in detail so as not to obscure the understanding of this description.

[0058] Furthermore, those skilled in the art will appreciate that although some embodiments described herein include certain features included in other embodiments but not other features, combinations of features from different embodiments are intended to be within the scope of the present invention and to form different embodiments. For example, any of the embodiments claimed herein may be used in any combination.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention.

Claims

1. A power supply switching hardware circuit, characterized in that: It includes a first switch circuit, a second switch circuit and a switching control circuit; The first switch circuit is connected between the internal power supply interface and the whole machine power supply interface, and is used to connect the power supply path between the internal power supply and the whole machine after the internal power supply is turned on, so as to realize the whole machine power supply of the internal power supply; The second switch circuit is connected between the external power supply interface and the whole machine power supply interface, and is used to connect the power supply path between the external power supply and the whole machine after the external power supply is turned on, so as to realize the whole machine power supply of the external power supply; a switching control circuit connected between the first switch circuit and the second switch circuit, for controlling the on and off of the first switch circuit to isolate the external power supply from the internal power supply; The external power supply is connected to the entire device through port J1, and supplies power to the base of transistor Q5 through the sixth resistor R12, turning the transistor on. At the same time, the S pole of the third field-effect transistor U6 is charged through the body diode of the third field-effect transistor U6. The voltage is then divided by the fourth resistor R1 and the fifth resistor R2, turning on the third field-effect transistor U6 and the fourth field-effect transistor U1. The external power supply is connected to VCC-IN to power the entire device. The third transistor Q2 is driven by the seventh resistor R6 to be turned on. After the third transistor Q2 is turned on, the collector of the third transistor Q2 is pulled down to a low level. The collector of the third transistor Q2 is connected to the base of the first transistor Q1, which synchronously pulls the base of the first transistor Q1 down to a low level. The first transistor Q1 is turned off. After the first transistor Q1 is turned off, the first field effect transistor U3 and the second field effect transistor U4 do not meet the turn-on condition. The first field effect transistor U3 and the second field effect transistor U4 are turned off, and the power supply path between the battery and the whole device is cut off. At this time, the whole device is powered by an external power supply, and the external power supply is isolated from the internal power supply.

2. The power supply switching hardware circuit according to claim 1, wherein: The switching control circuit is specifically used to disconnect the power supply path between the internal power supply and the entire device when the second switch circuit connects the power supply path between the external power supply and the entire device.

3. The power supply switching hardware circuit according to claim 2, wherein: The power supply switching hardware circuit further includes an MCU main control module, which is used to turn off the internal power supply when the switching control circuit disconnects the power supply path between the internal power supply and the entire machine.

4. The power supply switching hardware circuit according to claim 1, wherein: The first switching circuit includes a first field-effect transistor, a second field-effect transistor, a first transistor, a first resistor, a second resistor and a third resistor. The S poles of the first field-effect transistor and the second field-effect transistor are connected, the D pole of the first field-effect transistor is connected to the internal power supply interface, the D pole of the second field-effect transistor is connected to the power supply interface of the whole machine, the first resistor and the second resistor form a series branch, one end of the first resistor is connected to the S poles of the first field-effect transistor and the second field-effect transistor respectively, and the other end is connected to the G poles of the first field-effect transistor and the second field-effect transistor respectively, the other end of the second resistor is connected to the collector of the first transistor, the third resistor is connected between the S pole of the first field-effect transistor and the base of the first transistor, and the emitter of the first transistor is grounded.

5. The power supply switching hardware circuit according to claim 4, wherein: The second switching circuit includes a third field-effect transistor, a fourth field-effect transistor, a second triode, a fourth resistor, a fifth resistor and a sixth resistor. The S poles of the third field-effect transistor and the fourth field-effect transistor are connected, the D pole of the third field-effect transistor is connected to the external power supply interface, the D pole of the fourth field-effect transistor is connected to the power supply interface of the whole machine, the fourth resistor and the fifth resistor form a series branch, one end of the fourth resistor is connected to the S poles of the third field-effect transistor and the fourth field-effect transistor respectively, and the other end is connected to the G poles of the third field-effect transistor and the fourth field-effect transistor respectively, the other end of the fifth resistor is connected to the collector of the second triode, the sixth resistor is connected between the D pole of the third field-effect transistor and the base of the second triode, and the emitter of the second triode is grounded.

6. The power supply switching hardware circuit according to claim 5, wherein: The switching control circuit includes a third transistor and a seventh resistor, one end of the seventh resistor is connected to the D pole of the third field-effect transistor, and the other end is connected to the base of the third transistor, the collector of the third transistor is connected to the base of the first transistor, and the emitter of the third transistor is grounded.

7. The power supply switching hardware circuit according to any one of claims 1 to 6, wherein: The power supply switching hardware circuit also includes an internal power supply charging switch circuit, which is connected to the switching control circuit and is used to control the switching control circuit to stop working according to the charging control signal of the MCU main control module, so that when the second switch circuit connects the power supply path between the external power supply and the whole machine, the charging path between the external power supply and the internal power supply is also connected.

8. The power supply switching hardware circuit according to claim 7, wherein: The internal power charging switch circuit includes a fourth transistor and an eighth resistor, the eighth resistor is connected between the control interface of the MCU main control module and the base of the fourth transistor, the collector of the fourth transistor is connected to the control input end of the switching control circuit, and the emitter of the fourth transistor is grounded.

9. The power supply switching hardware circuit according to claim 7, wherein: The internal power supply charging switch circuit is also used to resume the operation of the switching control circuit according to the charging stop signal of the MCU main control module, so as to disconnect the charging path between the external power supply and the internal power supply.

10. A power supply circuit, characterized in that: The device comprises a power supply switching hardware circuit as described in any one of claims 1 to 9.

11. An electronic device, characterized in that: Comprising the power supply circuit as claimed in claim 10.

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