Switchable dual-power-supply start-stop circuit

Abstract

The utility model provides a switchable dual-power-supply start-stop circuit. The switchable dual-power-supply start-stop circuit comprises a first battery pack, a second battery pack, a first switch, a second switch, a third switch and a microcontroller, the anode end of the first battery pack is connected with the battery output anode wire harness, and the cathode end is connected with one end of the second switch; the other end of the second switch is connected with the cathode end of the second battery pack; the anode end of the second battery pack is connected with one end of the first switch, the cathode end is connected with the battery output cathode wire harness, and the other end of the first switch is connected with the anode end of the first battery pack; one end of the third switch is connected to a connection node between the negative end of the first battery pack and the second switch, and the other end is connected to a connection node between the first switch and the positive end of the second battery pack; the microcontroller is in communication connection with the first switch, the second switch and the third switch. The reliability and the flexibility of the dual-power system can be improved, different vehicle start-stop power systems can be freely adapted, and the design adaptation cost is greatly reduced.

Description

Technical Field

[0001] This application relates to the field of battery energy system technology, and in particular to a switchable dual-power start-stop circuit. Background Technology

[0002] With the widespread application of power supply systems in electronic equipment, industrial control systems, and transportation, dual power supply systems have gradually become an important means to ensure continuous power supply and stable operation of equipment. In typical application scenarios, dual power supply switching control circuits are widely used to adapt to the different voltage level requirements of equipment in different operating modes, or to switch to backup power in a timely manner when the main power supply fails.

[0003] In existing technologies, common dual power supply switching systems often use relay switching, power management chips, and other methods for automatic or manual control. However, these methods often lack flexible start-stop control logic, making it difficult to dynamically select the power mode according to load requirements or host computer instructions. They cannot meet the dynamic switching requirements for voltage levels in complex application scenarios. The circuit structure is relatively complex or redundant, especially during power switching, which can easily lead to transient voltage surges or output interruptions, affecting system stability. In certain cases of misoperation or fault, the two power supplies may be short-circuited or abnormally connected, posing safety hazards. Utility Model Content

[0004] In view of this, the purpose of this application is to provide a switchable dual-power start-stop circuit with a simple circuit structure and status feedback and interlock control capabilities, which improves the reliability and flexibility of the dual-power system, can freely switch between different voltage levels, and can be freely adapted to different vehicle start-stop power systems, thereby significantly reducing design and adaptation costs.

[0005] In a first aspect, embodiments of this application provide a switchable dual-power start-stop circuit, including a first battery pack, a second battery pack, a first switch, a second switch, a third switch, and a microcontroller;

[0006] The positive terminal of the first battery pack is connected to the positive output wire harness, the negative terminal is connected to one end of the second switch, and the other end of the second switch is connected to the negative terminal of the second battery pack.

[0007] The positive terminal of the second battery pack is connected to one end of the first switch, and the negative terminal is connected to the negative output wire harness of the battery. The other end of the first switch is connected to the positive terminal of the first battery pack.

[0008] One end of the third switch is connected to the connection node between the negative terminal of the first battery pack and the second switch, and the other end is connected to the connection node between the first switch and the positive terminal of the second battery pack.

[0009] The microcontroller is communicatively connected to the first switch, the second switch, and the third switch, respectively, to control the closing or opening of the first switch, the second switch, and the third switch.

[0010] In conjunction with the first aspect, this application provides a first possible implementation of the first aspect, wherein the first current collector is disposed on the line between the negative terminal of the second battery pack and the negative output terminal harness of the battery;

[0011] The second current collector is installed on the line between the positive terminal of the first battery pack and the positive output terminal harness of the battery.

[0012] In conjunction with the first aspect, this application provides a second possible implementation of the first aspect, which further includes a first fuse, a second fuse, and a third fuse;

[0013] One end of the first fuse is connected to the positive terminal of the first battery pack, and the other end is connected to the positive output wire harness of the battery.

[0014] One end of the second fuse is connected to the negative terminal of the first battery pack, and the other end is connected to the connection node between the second switch and the third switch;

[0015] One end of the third fuse is connected to the connection node between the first switch and the third switch, and the other end is connected to the positive terminal of the second battery pack.

[0016] In conjunction with the first aspect, embodiments of this application provide a third possible implementation of the first aspect, which further includes a sampling sub-circuit;

[0017] The input terminals of the sampling sub-circuit are respectively connected to the first current collector and the second current collector to obtain the current signals collected by the first current collector and the second current collector.

[0018] The output of the sampling sub-circuit is communicatively connected to the microcontroller to transmit the current signal to the microcontroller.

[0019] In conjunction with the first aspect, embodiments of this application provide a fourth possible implementation of the first aspect, which further includes a feedback sub-circuit;

[0020] The input terminals of the feedback sub-circuit are communicatively connected to the first switch, the second switch, and the third switch, respectively, to collect the switching states of the first switch, the second switch, and the third switch;

[0021] The output of the feedback sub-circuit is communicatively connected to the microcontroller to transmit the switch state to the microcontroller.

[0022] In conjunction with the first aspect, this application provides a fifth possible implementation of the first aspect, which further includes an analog front-end circuit;

[0023] The input terminals of the analog front-end circuit are respectively connected to the first battery pack and the second battery pack to collect the voltage information corresponding to the first battery pack and the second battery pack.

[0024] The output terminal of the analog front-end terminal circuit is connected to the microcontroller to transmit the acquired voltage information to the microcontroller.

[0025] In conjunction with the first aspect, this application provides a sixth possible implementation of the first aspect, which further includes a host computer;

[0026] The host computer is connected to the microcontroller and is used to send a voltage mode selection signal to the microcontroller.

[0027] In conjunction with the first aspect, this application provides a seventh possible implementation of the first aspect, which further includes a communication sub-circuit;

[0028] The communication sub-circuit is located between the host computer and the microcontroller and is used to transmit the voltage mode selection signal.

[0029] In conjunction with the first aspect, this application provides an eighth possible implementation of the first aspect, wherein when the voltage mode selection signal indicates the output of a first voltage, the microcontroller controls the first switch and the second switch to close, and the third switch to open;

[0030] When the voltage mode selection signal indicates that a second voltage is output, the microcontroller controls the first switch and the second switch to disconnect, and the third switch to close.

[0031] In conjunction with the first aspect, this application provides a ninth possible implementation of the first aspect, wherein the first switch and the second switch are linked and control each other, and form an interlock circuit with the third switch.

[0032] This application provides a switchable dual-power start-stop circuit, including a first battery pack, a second battery pack, a first switch, a second switch, a third switch, and a microcontroller. The positive terminal of the first battery pack is connected to the positive output wiring harness, and the negative terminal is connected to one end of the second switch. The other end of the second switch is connected to the negative terminal of the second battery pack. The positive terminal of the second battery pack is connected to one end of the first switch, and the negative terminal is connected to the negative output wiring harness. The other end of the first switch is connected to the positive terminal of the first battery pack. One end of the third switch is connected to the connection node between the negative terminal of the first battery pack and the second switch, and the other end is connected to the connection node between the first switch and the positive terminal of the second battery pack. The microcontroller is communicatively connected to the first switch, the second switch, and the third switch to control the closing or opening of the first switch, the second switch, and the third switch. The circuit structure is simple and has status feedback and interlocking control capabilities, improving the reliability and flexibility of the dual-power system. It can freely switch between different voltage levels and adapt to different vehicle start-stop power supply systems, significantly reducing design and adaptation costs. Attached Figure Description

[0033] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 One of the structural schematic diagrams of a switchable dual-power start-stop circuit provided in this embodiment of the present utility model;

[0035] Figure 2 A second schematic diagram of a switchable dual-power start-stop circuit provided for an embodiment of this utility model;

[0036] Figure 3 Provided for the embodiments of this utility model Figure 2 The third schematic diagram of a switchable dual-power start-stop circuit provided for an embodiment of this utility model.

[0037] Legend: 10-First battery pack; 11-Second battery pack; 12-First switch; 13-Second switch; 14-Third switch; 15-Microcontroller; 16-First current collector; 17-Second current collector; 18-First fuse; 19-Second fuse; 20-Third fuse; 110-Sampling sub-circuit; 111-Feedback sub-circuit; 112-Analog front-end terminal circuit; 113-Host computer; 114-Communication sub-circuit. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0039] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0040] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0041] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0042] Furthermore, the terms "first," "second," and "third" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0043] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0044] In existing technologies, common dual power supply switching systems often employ relay switching, power management chips, and other methods for automatic or manual control. However, these methods often lack flexible start-stop control logic, making it difficult to dynamically select the power mode based on load requirements or host computer instructions. This fails to meet the dynamic switching requirements for voltage levels in complex application scenarios. Furthermore, the circuit structure is relatively complex or redundant, especially during power switching, which can easily lead to transient voltage surges or output interruptions, affecting system stability. Under certain misoperation or fault conditions, the two power supplies may short-circuit or be abnormally connected, posing safety hazards.

[0045] Please see Figure 1 , Figure 1 This is one of the structural schematic diagrams of a switchable dual-power start-stop circuit provided in this embodiment. For example... Figure 1 As shown in the figure, the switchable dual-power start-stop circuit provided in this embodiment includes: a first battery pack 10, a second battery pack 11, a first switch 12, a second switch 13, a third switch 14, and a microcontroller 15.

[0046] Specifically, the positive terminal of the first battery pack 10 is connected to the battery output positive wire harness P+, and the negative terminal is connected to one end of the second switch 13. The other end of the second switch 13 is connected to the negative terminal of the second battery pack 11. The positive terminal of the second battery pack 11 is connected to one end of the first switch 12, and the negative terminal is connected to the battery output negative wire harness P-. The other end of the first switch 12 is connected to the positive terminal of the first battery pack 10. One end of the third switch 14 is connected to the connection node between the negative terminal of the first battery pack 10 and the second switch 13, and the other end is connected to the connection node between the first switch 12 and the positive terminal of the second battery pack 11. The microcontroller 15 is communicatively connected to the first switch 12, the second switch 13, and the third switch 14 to control the closing or opening of the first switch 12, the second switch 13, and the third switch 14.

[0047] Here, the positive terminal of the first battery pack 10 is connected to the battery output positive wiring harness P+, which is used to provide positive power output to the external load; the negative terminal of the first battery pack 10 is connected to one end of the second switch 13; the other end of the second switch 13 is connected to the negative terminal of the second battery pack 11; the positive terminal of the second battery pack 11 is connected to one end of the first switch 12; the negative terminal of the second battery pack 11 is connected to the battery output negative wiring harness P-, which is used to provide negative power output to the external load; the other end of the first switch 12 is connected back to the positive terminal of the first battery pack 10, forming a dual power supply closed loop; one end of the third switch 14 is connected to the connection node between the negative terminal of the first battery pack 10 and the second switch 13, and the other end is connected to the connection node between the first switch 12 and the positive terminal of the second battery pack 11, which is used to form a switching path under specific control logic.

[0048] In addition, the microcontroller 15 is communicatively connected to the first switch 12, the second switch 13 and the third switch 14 respectively, and can control the closing or opening of the three sets of switches according to signal instructions (such as voltage mode selection signals from the host computer), thereby realizing the start-stop control and voltage switching function between the two power supplies.

[0049] For example, when the system needs to output the first voltage mode (e.g., 24V), the microcontroller 15 controls the first switch 12 and the second switch 13 to close and the third switch 14 to open. At this time, the first battery pack 10 and the second battery pack 11 are connected in series to form a high voltage output. When the system needs to output the second voltage mode (e.g., 48V), the microcontroller 15 controls the first switch 12 and the second switch 13 to open and the third switch 14 to close. At this time, the two battery packs are connected in parallel to supply power and form a low voltage output.

[0050] It should be noted that the first switch 12 and the second switch 13 are linked and form an interlock circuit with the third switch 14. That is, the closing and opening of the first switch 12 and the second switch 13 are synchronized, but they cannot close simultaneously with the third switch 14.

[0051] Please see Figure 2 , Figure 2 This is a second schematic diagram of a switchable dual-power start / stop circuit provided in this embodiment. Figure 2 As shown in the figure, the switchable dual-power start-stop circuit provided in this embodiment includes: a first battery pack 10, a second battery pack 11, a first switch 12, a second switch 13, a third switch 14, and a microcontroller 15. It also includes a first current collector 16, a second current collector 17, a first fuse 18, a second fuse 19, a third fuse 20, and a sampling sub-circuit 110.

[0052] Specifically, the first current collector 16 is installed on the line between the negative terminal of the second battery pack 11 and the negative output wire P- of the battery; the second current collector 17 is installed on the line between the positive terminal of the first battery pack 10 and the positive output wire P+ of the battery. One end of the first fuse 18 is connected to the positive terminal of the first battery pack 10, and the other end is connected to the positive output wire P+ of the battery; one end of the second fuse 19 is connected to the negative terminal of the first battery pack 10, and the other end is connected to the connection node between the second switch 13 and the third switch 14. The input terminals of the sampling sub-circuit 110 are communicatively connected to the first current collector 16 and the second current collector 17 to obtain the current signals collected by the first current collector 16 and the second current collector 17; the output terminal of the sampling sub-circuit 110 is communicatively connected to the microcontroller 15 to transmit the current signals to the microcontroller 15. One end of the third fuse 20 is connected to the connection node between the first switch 12 and the third switch 14, and the other end is connected to the positive terminal of the second battery pack 11.

[0053] Here, the first current collector 16 is installed in the line between the negative terminal of the second battery pack 11 and the negative output wire P- of the battery, and is used to collect the output current of the second battery pack; the second current collector 17 is installed in the line between the positive terminal of the first battery pack 10 and the positive output wire P+ of the battery, and is used to collect the output current of the first battery pack; one end of the first fuse 18 is connected to the positive terminal of the first battery pack 10, and the other end is connected to the positive output wire P+ of the battery, and is used to provide circuit protection in case of abnormal overcurrent; one end of the second fuse 19 is connected to the negative terminal of the first battery pack 10, and the other end is connected to the connection node between the second switch 13 and the third switch 14, and is used to provide overcurrent protection for the negative path; the input terminal of the sampling sub-circuit 110 is communicatively connected to the first current collector 16 and the second current collector 17, and is used to receive and process the current signal acquired by the current collector; the output terminal of the sampling sub-circuit 110 is communicatively connected to the microcontroller 15, and can feed back the sampled and processed current information to the microcontroller for circuit state judgment and control logic adjustment.

[0054] Optionally, through the above structural design, this embodiment can realize real-time monitoring of the output current of the first battery pack 10 and the second battery pack 11. After receiving the current data transmitted by the sampling sub-circuit 110, the microcontroller 15 can determine whether the current power supply status is normal based on a preset threshold, and control the closing state of the first switch 12, the second switch 13 and the third switch 14 accordingly, further improving the intelligence and safety of the circuit operation.

[0055] For example, in switching or parallel operation, if an abnormal current (too high or zero) is detected in a certain battery pack, the microcontroller 15 can automatically disconnect the corresponding switch to prevent battery overload, short circuit, or faulty power supply from continuing to operate. In addition, the first fuse 18 and the second fuse 19, as passive protection components, can provide a final safety barrier when the microcontroller fails to respond, improving the robustness of the entire start-stop circuit system.

[0056] Please see Figure 3 , Figure 3 This is the third schematic diagram of a switchable dual-power start-stop circuit provided in this embodiment. Figure 3 As shown in the diagram, the switchable dual-power start / stop circuit provided in this embodiment includes: a first battery pack 10, a second battery pack 11, a first switch 12, a second switch 13, a third switch 14, a microcontroller 15, a first current collector 16, a second current collector 17, a first fuse 18, a second fuse 19, a third fuse 20, and a sampling sub-circuit 110. It also includes a feedback sub-circuit 111, an analog front-end terminal circuit 112, a host computer 113, and a communication sub-circuit 114.

[0057] Specifically, the input terminals of the feedback sub-circuit 111 are communicatively connected to the first switch 12, the second switch 13, and the third switch 14, respectively, to collect the switching states of the first switch 12, the second switch 13, and the third switch 14; the output terminal of the feedback sub-circuit 111 is communicatively connected to the microcontroller 15 to transmit the switching states to the microcontroller 15. The input terminals of the analog front-end sub-circuit 112 are communicatively connected to the first battery pack 10 and the second battery pack 11, respectively, to collect the voltage information corresponding to the first battery pack 10 and the second battery pack 11; the output terminal of the analog front-end sub-circuit 112 is connected to the microcontroller 15 to transmit the collected voltage information to the microcontroller 15. The host computer 113 is connected to the microcontroller 15 and is used to send a voltage mode selection signal to the microcontroller 15. The communication sub-circuit 114 is located between the host computer 113 and the microcontroller 15 and is used to transmit the voltage mode selection signal.

[0058] Here, the input terminals of the feedback sub-circuit 111 are communicatively connected to the first switch 12, the second switch 13, and the third switch 14, respectively, to collect the current closed or open state of these switches and send the state information to the microcontroller 15 through its output terminal. The microcontroller can then compare the command state with the actual state to achieve closed-loop control and fault detection. The input terminals of the analog front-end sub-circuit 112 are communicatively connected to the first battery pack 10 and the second battery pack 11, respectively, to collect the voltage information of the two battery packs and transmit it to the microcontroller 15 through its output terminal. This module performs analog signal processing on the battery ports, such as filtering, amplification, or level conversion, to ensure the accuracy of the sampled signal and voltage compatibility. The host computer 113 establishes a communication connection with the microcontroller 15 through the communication sub-circuit 114, to send a voltage mode selection signal to the microcontroller, such as selecting power supply from a 24V or 48V battery pack, or controlling the parallel / independent operation mode of the battery packs. The communication sub-circuit 114 can be an interface protocol circuit such as UART, CAN, RS485, or SPI to adapt to the communication needs of different system platforms.

[0059] Optionally, the host computer 113 can serve as a human-machine interface or main control center, which can monitor the circuit operation status in real time and dynamically configure the operation strategy to improve the system's flexibility and intelligence.

[0060] In specific implementation, when the voltage mode selection signal indicates the output of the first voltage, the microcontroller 15 controls the first switch 12 and the second switch 13 to close, and the third switch 14 to open; when the voltage mode selection signal indicates the output of the second voltage, the microcontroller 15 controls the first switch 12 and the second switch 13 to open, and the third switch 14 to close.

[0061] Here, when the voltage mode selection signal sent by the external host computer 113 indicates that a first voltage (e.g., 24V) needs to be output, the communication sub-circuit 114 receives the mode selection signal and transmits it to the microcontroller 15. The microcontroller 15 causes the first switch 12 and the second switch 13 to be closed, while the third switch 14 is open. At this time, the first battery pack 10 and the second battery pack 11 form a series structure through their connection paths, forming the first voltage output path. The output voltage between the positive terminal bundle P+ and the negative terminal bundle P- of the battery output is the sum of the voltages of the two battery packs.

[0062] When the voltage mode selection signal indicates that a second voltage (e.g., 48V) needs to be output, the communication sub-circuit 114 sends this instruction to the microcontroller 15. The microcontroller 15 then controls the first switch 12 and the second switch 13 to be in the open state, while the third switch 14 is closed. At this time, the circuit structure automatically constructs a new voltage output path, with only a portion of the battery pack involved in power output, thereby achieving a switch between the output terminals P+ and P- to the second voltage level.

[0063] In this way, the entire voltage switching process is achieved through the physical transformation of the switching state, without relying on high-level logic decision-making. The coordinated operation between the communication sub-circuit, the drive module, and the switching devices ensures automatic voltage output conversion, improves the circuit's structural integration and operational reliability, avoids dependence on complex software calculations, and is suitable for energy storage or industrial power supply systems with high stability and high security requirements.

[0064] This application provides a switchable dual-power start-stop circuit, including a first battery pack, a second battery pack, a first switch, a second switch, a third switch, and a microcontroller. The positive terminal of the first battery pack is connected to the positive output wiring harness, and the negative terminal is connected to one end of the second switch. The other end of the second switch is connected to the negative terminal of the second battery pack. The positive terminal of the second battery pack is connected to one end of the first switch, and the negative terminal is connected to the negative output wiring harness. The other end of the first switch is connected to the positive terminal of the first battery pack. One end of the third switch is connected to the connection node between the negative terminal of the first battery pack and the second switch, and the other end is connected to the connection node between the first switch and the positive terminal of the second battery pack. The microcontroller is communicatively connected to the first switch, the second switch, and the third switch to control the closing or opening of the first switch, the second switch, and the third switch. The circuit structure is simple and has status feedback and interlocking control capabilities, improving the reliability and flexibility of the dual-power system. It can freely switch between different voltage levels and adapt to different vehicle start-stop power supply systems, significantly reducing design and adaptation costs.

[0065] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A switchable dual-power start / stop circuit, characterized in that, It includes a first battery pack, a second battery pack, a first switch, a second switch, a third switch, and a microcontroller; The positive terminal of the first battery pack is connected to the positive output wire harness, the negative terminal is connected to one end of the second switch, and the other end of the second switch is connected to the negative terminal of the second battery pack. The positive terminal of the second battery pack is connected to one end of the first switch, and the negative terminal is connected to the negative output wire harness of the battery. The other end of the first switch is connected to the positive terminal of the first battery pack. One end of the third switch is connected to the connection node between the negative terminal of the first battery pack and the second switch, and the other end is connected to the connection node between the first switch and the positive terminal of the second battery pack. The microcontroller is communicatively connected to the first switch, the second switch, and the third switch, respectively, to control the closing or opening of the first switch, the second switch, and the third switch.

2. The switchable dual-power start / stop circuit according to claim 1, characterized in that, It also includes a first current collector and a second current collector; The first current collector is installed on the line between the negative terminal of the second battery pack and the negative output terminal harness of the battery; The second current collector is installed on the line between the positive terminal of the first battery pack and the positive output terminal harness of the battery.

3. The switchable dual-power start / stop circuit according to claim 1, characterized in that, It also includes a first fuse, a second fuse, and a third fuse; One end of the first fuse is connected to the positive terminal of the first battery pack, and the other end is connected to the positive output wire harness of the battery. One end of the second fuse is connected to the negative terminal of the first battery pack, and the other end is connected to the connection node between the second switch and the third switch; One end of the third fuse is connected to the connection node between the first switch and the third switch, and the other end is connected to the positive terminal of the second battery pack.

4. The switchable dual-power start / stop circuit according to claim 2, characterized in that, It also includes a sampling sub-circuit; The input terminals of the sampling sub-circuit are respectively connected to the first current collector and the second current collector to obtain the current signals collected by the first current collector and the second current collector. The output of the sampling sub-circuit is communicatively connected to the microcontroller to transmit the current signal to the microcontroller.

5. The switchable dual-power start / stop circuit according to claim 1, characterized in that, It also includes a feedback sub-circuit; The input terminals of the feedback sub-circuit are communicatively connected to the first switch, the second switch, and the third switch, respectively, to collect the switching states of the first switch, the second switch, and the third switch; The output of the feedback sub-circuit is communicatively connected to the microcontroller to transmit the switch state to the microcontroller.

6. The switchable dual-power start / stop circuit according to claim 1, characterized in that, It also includes analog front-end circuitry; The input terminals of the analog front-end circuit are respectively connected to the first battery pack and the second battery pack to collect the voltage information corresponding to the first battery pack and the second battery pack. The output terminal of the analog front-end terminal circuit is connected to the microcontroller to transmit the acquired voltage information to the microcontroller.

7. The switchable dual-power start / stop circuit according to claim 1, characterized in that, It also includes the host computer; The host computer is connected to the microcontroller and is used to send a voltage mode selection signal to the microcontroller.

8. The switchable dual-power start / stop circuit according to claim 7, characterized in that, It also includes communication sub-circuits; The communication sub-circuit is located between the host computer and the microcontroller and is used to transmit the voltage mode selection signal.

9. The switchable dual-power start / stop circuit according to claim 7, characterized in that: When the voltage mode selection signal indicates that a first voltage is output, the microcontroller controls the first switch and the second switch to close, and the third switch to open; When the voltage mode selection signal indicates that a second voltage is output, the microcontroller controls the first switch and the second switch to disconnect, and the third switch to close.

10. The switchable dual-power start / stop circuit according to claim 1, characterized in that: The first switch and the second switch are linked for control, and form an interlock circuit with the third switch.

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