A power supply circuit and apparatus

Abstract

The application discloses a power supply circuit and device. The power supply circuit comprises a first battery pack, a second battery pack, a switch circuit, a voltage conversion circuit and a controller. The first battery pack and the second battery pack are connected in parallel to the input of the voltage conversion circuit, and the overall circuit structure formed by the first battery pack, the second battery pack and the voltage conversion circuit is connected in parallel to the switch circuit, one side of which is used for connecting a power supply, and the other side is used for connecting a load. The controller controls the working state of the switch circuit and the voltage conversion circuit by detecting whether the power supply can provide working voltage. When it is detected that the working voltage is received, it is determined that the working power is not connected at present, and the switch circuit is controlled to be disconnected, so as to cut off the loop between the power supply and the load. At the same time, the voltage conversion circuit is controlled to work, the first battery pack and the second battery pack are connected in parallel to the load, and large current is provided for the load, so as to improve the high-power driving capability of the load.

Description

Technical Field

[0001] This application relates to the field of battery power supply technology, and in particular to a power supply circuit and device. Background Technology

[0002] For some portable electronic products, when not connected to an adapter for charging, they are typically powered temporarily by a single battery or a battery pack, allowing the product to be taken outdoors for short periods of time. However, the limited output current provided by batteries or battery packs significantly restricts the power output capability of portable loads when not connected to a power source, making it difficult to achieve optimal output power when powered by batteries or battery packs. Utility Model Content

[0003] The main objective of this application is to provide a power supply circuit and device, which aims to solve the technical problem of how to improve the load driving capability of portable electronic products when they are not connected to a power source.

[0004] To achieve the above objectives, this application provides a power supply circuit, which includes: a first battery pack, a second battery pack, a switching circuit, a voltage conversion circuit, and a controller.

[0005] The first terminal of the switching circuit, the first battery pack, the second battery pack, the voltage conversion circuit, and the input terminal of the controller's power supply are used to connect to the power supply. The second terminal of the switching circuit and the output terminal of the voltage conversion circuit are connected to the load. The controller is connected to the switching circuit and the voltage conversion circuit respectively.

[0006] The controller is used to send a shutdown signal to the switching circuit and a control signal to the voltage conversion circuit when it does not receive the operating voltage provided by the power supply.

[0007] A switching circuit is used to disconnect the connection between the power supply and the load when a shutdown signal is received.

[0008] A voltage conversion circuit is used to convert at least one of a first voltage provided by a first battery pack and a second voltage provided by a second battery pack into a target voltage when a control signal is received, and to provide the target voltage to the load. Attached Figure Description

[0009] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0010] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 This is a structural connection diagram provided for Embodiment 1 of the power supply circuit of this application;

[0012] Figure 2 The circuit connection diagram provided for Embodiment 2 of the power supply circuit of this application;

[0013] Figure 3 The circuit connection diagram provided for Embodiment 3 of the power supply circuit of this application.

[0014] The purpose, features, and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0015] It should be understood that the specific embodiments described herein are merely illustrative of the technical solutions of this application and are not intended to limit this application.

[0016] To better understand the technical solution of this application, a detailed description will be provided below in conjunction with the accompanying drawings and specific implementation methods.

[0017] This application presents a power supply circuit according to a first embodiment; please refer to [link / reference]. Figure 1 The power supply circuit includes: a first battery pack B1, a second battery pack B2, a switching circuit 10, a voltage conversion circuit 30, and a controller 20.

[0018] The first terminal of the switching circuit 10, the first battery pack B1, the second battery pack B2, the voltage conversion circuit 30, and the input terminal of the controller 20 are used to connect to the power supply 40. The second terminal of the switching circuit 10 and the output terminal of the voltage conversion circuit 30 are connected to the load 50. The controller 20 is connected to the switching circuit 10 and the voltage conversion circuit 30 respectively.

[0019] The controller 20 is used to send a shutdown signal to the switching circuit 10 and a control signal to the voltage conversion circuit 30 when it does not receive the operating voltage provided by the power supply 40.

[0020] The switching circuit 10 is used to disconnect the connection between the power supply 40 and the load 50 when a shutdown signal is received.

[0021] The voltage conversion circuit 30 is used to convert at least one of the first voltage provided by the first battery pack B1 and the second voltage provided by the second battery pack B2 into a target voltage when a control signal is received, and to provide the target voltage to the load 50.

[0022] It should be understood that the target voltage refers to the voltage that ensures the normal operation of the load 50. In this embodiment, the power supply circuit can be specifically applied to a power supply device for a portable electronic product, wherein the load 50 can be understood as the core electrical component of the portable electronic product, which can perform a specific operation based on the target voltage provided by the power supply circuit or power supply device. As a preferred embodiment, the portable electronic product can be a pair of headphones, and correspondingly, the load 50 can be the speaker inside the headphones, and the power supply 40 can be understood as the headphone adapter or charger.

[0023] It should be noted that the first voltage refers to the voltage across the terminals of the first battery pack B1, and the second voltage refers to the voltage across the terminals of the second battery pack B2. In this embodiment, the first battery pack B1 and the second battery pack B2 are two battery packs composed of the same number and type of batteries connected in series and / or in parallel. When both are fully charged, the first voltage output by the first battery pack B1 and the second voltage output by the second battery pack B2 are essentially the same.

[0024] It is easy to understand that the voltage conversion circuit 30 can perform voltage conversion between the first voltage and / or the second voltage, thereby providing a target voltage to the load 50 connected to the downstream stage. Furthermore, the voltage conversion circuit 30 can also control the on / off state of the connection loop between the first battery pack B1 or the second battery pack B2 and the load 50. In this embodiment, when the voltage conversion circuit 30 is in the working state, it can convert the first voltage provided by the first battery pack B1 into the target voltage required by the load 50, or convert the second voltage provided by the second battery pack B2 into the target voltage required by the load 50, and provide the target voltage to the load 50 to drive the load 50 to operate. When the voltage conversion circuit 30 is not in the working state, it stops working and disconnects the connection loop between the first battery pack B1 and / or the second battery pack B2 and the load 50. At this time, the load 50 cannot receive the target voltage provided by the voltage conversion circuit 30.

[0025] It should be noted that in this embodiment, the switching circuit 10 mainly functions to control the on / off state of the electrical connection loop. When the switching circuit 10 is in the on state, it can connect the connection loop between the power supply 40 and the load 50, and the operating voltage provided by the power supply 40 cannot be directly supplied to the load 50; when the switching circuit 10 is in the off state, it can disconnect the connection loop between the power supply 40 and the load 50, and the operating voltage provided by the power supply 40 can be directly supplied to the load 50. As a specific embodiment, the switching circuit 10 may include a PMOS transistor Qp, the source of which is connected to the power supply 40, the drain of which is connected to the load 50, and the gate of which is connected to the controller 20.

[0026] It is easy to understand that the controller 20 can operate based on whether its power supply terminal receives the operating voltage provided by the power supply 40, thereby controlling the switching circuit 10 to switch its operating state and controlling the voltage conversion circuit 30 to switch its operating state. Specifically, the on and off signals generated by the controller 20 are used to control the switching circuit 10 to operate in the on and off states, respectively, while the control signals generated by the controller 20 are used to control the voltage conversion circuit 30 to perform voltage conversion. In one specific embodiment, the controller 20 may include a single system-on-a-chip, a single chip with digital signal processing capabilities, or a chip or control circuit integrated from both.

[0027] In practical implementation, if the power supply 40 is not currently connected, the controller 20, not receiving the operating voltage from the power supply 40, automatically sends a shutdown signal to the switching circuit 10, causing the switching circuit 10 to disconnect the connection between the power supply 40 and the load 50. Simultaneously, the controller 20 sends a corresponding control signal to the voltage conversion circuit 30, causing the voltage conversion circuit 30 to perform voltage conversion. If the first battery pack B1 is connected, the voltage conversion circuit 30 converts the first voltage provided by the first battery pack B1 into the target voltage required by the load 50. Correspondingly, if the second battery pack B2 is connected, the voltage conversion circuit 30 converts the second voltage provided by the second battery pack B2 into the target voltage required by the load 50. Subsequently, the two parallel target voltages of the voltage conversion circuit 30 are simultaneously output to the load 50, achieving high-current power supply to the load 50.

[0028] If the power supply 40 is currently connected, the controller 20 receives the operating voltage provided by the power supply 40 and automatically sends an enable signal to the switching circuit 10, causing the switching circuit 10 to connect the power supply 40 and the load 50. Simultaneously, the controller 20 stops sending corresponding control signals to the voltage conversion circuit 30, causing the voltage conversion circuit 30 to disconnect the connection between the first battery pack B1 or the second battery pack B2 and the load 50. At this time, the operating voltage provided by the power supply 40 can be transmitted to the load 50 through the switching circuit 10, providing a large current to the load 50. Simultaneously, the operating voltage provided by the power supply 40 can also be directly supplied to the first battery pack B1 or the second battery pack B2, charging each battery pack respectively.

[0029] This application provides a power supply circuit including a first battery pack, a second battery pack, a switching circuit, a voltage conversion circuit, and a controller. The first and second battery packs are connected in parallel to the input of the voltage conversion circuit. The overall circuit structure formed by the first and second battery packs and the voltage conversion circuit is then connected in parallel with the switching circuit, with one side connected to the power supply and the other side connected to the load. The controller controls the operating state of the switching circuit and the voltage conversion circuit by detecting whether the power supply side can provide operating voltage. When operating voltage is detected, it is determined that no operating power supply is currently connected, and the switching circuit is controlled to open, thereby cutting off the loop between the power supply and the load. Simultaneously, the voltage conversion circuit is controlled to operate, connecting the first and second battery packs in parallel to the load to provide a large current to the load, thereby improving the high-power driving capability of the load.

[0030] Based on the first embodiment of the power supply circuit of this application, in the second embodiment of the power supply circuit of this application, the contents that are the same as or similar to those in the first embodiment described above can be referred to the above description, and will not be repeated hereafter. Based on this, please refer to... Figure 2 In this embodiment, the voltage conversion circuit 30 includes: a first boost module 31 and a second boost module 32;

[0031] The input terminal of the first boost module 31 is connected to the first battery pack B1, and the output terminal of the first boost module 31 is connected to the load 50; the input terminal of the second boost module 32 is connected to the second battery pack B2, and the output terminal of the second boost module 32 is connected to the load 50; the control terminals of the first boost module 31 and the second boost module 32 are respectively connected to the controller 20.

[0032] The control signals include a first control signal and a second control signal;

[0033] The controller 20 is used to send a first control signal to the first boost module 31 and a second control signal to the second boost module 32 when no operating voltage is received;

[0034] The first boost module 31 is used to boost the first voltage provided by the first battery pack B1 to the target voltage when it receives the first control signal, and to provide the target voltage to the load 50.

[0035] The second boost module 32 is used to boost the second voltage provided by the second battery pack B2 to the target voltage when the second control signal is received, and to provide the target voltage to the load 50.

[0036] It should be noted that the output voltages (first voltage / second voltage) of the first battery pack B1 and the second battery pack B2 are relatively low and cannot directly meet the target voltage required by the load 50. They need to be boosted before driving the load 50. In this embodiment, the voltage conversion circuit 30 may specifically include two boost modules, namely a first boost module 31 and a second boost module 32. Correspondingly, the control signals generated by the controller 20 may also include a first control signal provided to the first boost module 31 and a second control signal provided to the second boost module 32.

[0037] It is easy to understand that in this embodiment, when the power supply 40 is not connected to the power supply circuit, the first boost module 31 performs boost operation based on the first control signal sent by the controller 20, boosting the first voltage provided by the first battery pack B1 to form the target voltage required by the load 50; correspondingly, the second boost module performs boost operation based on the second control signal sent by the controller 20, boosting the second voltage provided by the second battery pack B2 to form the target voltage required by the load 50. Finally, the first boost module 31 and the second boost module 32 respectively transmit their respective formed target voltages in parallel to the load 50, providing a large current supply to the load 50.

[0038] Furthermore, in this embodiment, the power supply circuit also includes a charging circuit 60;

[0039] The input terminal of the charging circuit 60 is used to connect to the power supply 40, the first output terminal of the charging circuit 60 is connected to the first battery pack B1, and the second output terminal of the charging circuit 60 is connected to the second battery pack B2.

[0040] The charging circuit 60 is used to convert the operating voltage into a charging voltage when it receives the operating voltage, and to provide the charging voltage to the first battery pack B1 and the second battery pack B2 respectively.

[0041] The charging voltage is used to charge either the first battery pack B1 or the second battery pack B2.

[0042] It should be noted that the charging voltage refers to the voltage suitable for charging the first battery pack B1 or the second battery pack B2. The maximum voltage that the first battery pack B1 and the second battery pack B2 can withstand is relatively low, and the types of voltages provided are also somewhat different. Therefore, they cannot be directly charged using the operating voltage provided by the power supply 40, or the charging efficiency of directly charging the first battery pack B1 and the second battery pack B2 using the operating voltage would be low. In this embodiment, a charging circuit 60 can also be provided between the first battery pack B1 or the second battery pack B2 and the power supply 40. The charging circuit 60 can convert the operating voltage provided by the power supply 40 into a charging voltage suitable for charging the first battery pack B1 or the second battery pack B2, and provide it to the first battery pack B1 and the second battery pack B2 respectively for efficient charging.

[0043] Furthermore, in this embodiment, the charging circuit 60 includes: a first charging module 61 and a second charging module 62;

[0044] The input terminals of the first charging module 61 and the second charging module 62 are used to connect to the power supply 40. The output terminal of the first charging module 61 is connected to the first battery pack B1, and the output terminal of the second charging module 62 is connected to the second battery pack B2.

[0045] The first charging module 61 is used to convert the operating voltage into a charging voltage when it receives the operating voltage, and to provide the charging voltage to the first battery pack B1;

[0046] The second charging module 62 is used to convert the operating voltage into a charging voltage when it receives the operating voltage, and to provide the charging voltage to the second battery pack B2.

[0047] It is readily understood that, in this embodiment, the charging circuit 60 may also include two parts: a first charging module 61 and a second charging module 62. The first charging module 61 is disposed between the first battery pack B1 and the power supply 40, and is used to provide a charging voltage to the first battery pack B1 when the operating voltage provided by the power supply 40 is obtained, so as to charge the first battery pack B1 independently. The second charging module 62 is disposed between the second battery pack B2 and the power supply 40, and is used to provide a charging voltage to the second battery pack B2 when the operating voltage provided by the power supply 40 is obtained, so as to charge the second battery pack B2 independently.

[0048] Based on the first and / or second embodiments of the power supply circuit of this application, in the third embodiment of the power supply circuit of this application, the content that is the same as or similar to that of Embodiments 1 and 2 described above can be referred to the above description and will not be repeated hereafter. Based on this, please refer to... Figure 3 The power supply circuit also includes: a power amplifier circuit 70;

[0049] The input terminal of the power amplifier circuit 70 is connected to the output terminal of the switching circuit 10 and the output terminal of the voltage conversion circuit 30, and the output terminal of the power amplifier circuit 70 is connected to the load 50.

[0050] The power amplifier circuit 70 is used to amplify the current corresponding to the working voltage provided by the power supply 40 or the current corresponding to the target voltage provided by the voltage conversion circuit 30 based on the current amplification gain and then provide it to the load 50.

[0051] It should be noted that, in this embodiment, before providing the target voltage to the load 50, the power amplifier circuit 70 can amplify the current corresponding to the target voltage received, thereby adjusting the power received by the load 50.

[0052] It is easy to understand that the current amplification gain is used to characterize the ability of the power amplifier circuit 70 to amplify the current. In a specific implementation, if the current power supply 40 is connected to the power supply circuit, the switching circuit 10 connects the connection loop between the power supply 40 and the power amplifier circuit 70. After receiving the operating voltage provided by the power supply 40, the power amplifier circuit 70 amplifies the current based on its current amplification gain and then provides the amplified current to the load 50, providing sufficient power to the load 50. If the current power supply 40 is not connected to the power supply circuit, the switching circuit 10 disconnects the connection loop between the power supply 40 and the power amplifier circuit 70. The power amplifier circuit 70 receives the target voltage provided by the voltage conversion circuit 30 (obtained by conversion from the first voltage of the first battery pack B1 and the second voltage of the second battery pack B2). At this time, the power amplifier circuit 70 can amplify the current based on its current amplification gain and then provide the amplified current to the load 50, providing sufficient power to the load 50.

[0053] Furthermore, in this embodiment, the first battery pack B1 is placed in the first battery compartment BD1, the second battery pack B2 is placed in the second battery compartment BD2, and the interface between the first battery compartment BD1 and the second battery compartment BD2 is used to connect the power supply 40; the controller 20 is also electrically connected to the power amplifier circuit 70.

[0054] The power supply circuit also includes: a door detection device 80;

[0055] The door detection device 80 is electrically connected to the controller 20 and is installed on the door of the first battery compartment BD1 and the door of the second battery compartment BD2;

[0056] The door detection device 80 is used to send a first door detection signal to the controller 20 when it detects that the door of the first battery compartment BD1 is closed and the door of the second battery compartment BD2 is closed.

[0057] The controller 20 is also used to send a corresponding power adjustment signal to the power amplifier circuit 70 when it receives the first door detection signal and the power adjustment command provided externally, so as to adjust the current amplification gain of the power amplifier circuit 70.

[0058] It should be noted that the first battery compartment BD1 and the second battery compartment BD2 refer to two compartments inside the power supply device or portable electronic product, which are used to hold the first battery pack B1 and the second battery pack B2 respectively. They have conductive lines inside, and the first battery pack B1 and the second battery pack B2 can be electrically connected to the interface of the power supply 40 and the input terminal of the voltage conversion module through the conductive lines in the two battery compartments respectively.

[0059] It should be understood that, please refer to Figure 3 , Figure 3 The lower half of the circuit structure shown describes the connection relationships of related hardware structures such as the battery pack and battery compartment in the upper half of the circuit structure. In this embodiment, the first battery pack B1 is placed in the first battery compartment BD1, and the second battery pack B2 is placed in the second battery compartment BD2. Door detection devices for detecting the door status are provided at the doors of the first and second battery compartments BD1 and BD2. The door detection device 80 is a physical triggering device installed on the doors of the first and second battery compartments BD1 and electrically connected to the controller 20. The door detection device 80 is mainly used to detect the door status of the first and second battery compartments BD1 and BD2, thereby outputting different electrical signals to the controller 20, such as a first door detection signal indicating that both doors are closed.

[0060] It is easy to understand that in this embodiment, when the power supply 40 is not connected to the power supply circuit, and both the door of the first battery compartment BD1 and the second battery compartment BD2 are in the closed state, the door detection device 80 can output a corresponding first door detection signal to the controller 20. At this time, it can be considered that the first battery compartment BD1 and the second battery compartment BD2 have respectively completed the operation of filling the first battery pack B1 and the second battery pack B2. The controller 20 can send a corresponding power adjustment signal to the power amplifier circuit 70 based on the first door detection signal to adjust the current amplification gain of the power amplifier circuit 70.

[0061] It is worth noting that, in this embodiment, the controller 20 can also receive externally provided control commands to generate power adjustment signals with different adjustment modes (increase power / decrease power). These control commands can be triggered by other electrical structures. For example, when the load 50 is the speaker of a portable headset, a volume knob that can be rotated to provide a corresponding power adjustment signal to the controller 20 can be used to change the current amplification gain of the power amplifier circuit 70, thereby adjusting the power output to the speaker and thus changing the current output volume of the speaker.

[0062] It should be understood that, in this embodiment, when the power supply 40 is connected to the power supply circuit (i.e., when the power supply terminal of the controller 20 receives the operating voltage provided by the power supply 40), the controller 20 may disregard the first door detection signal or other door detection signals provided by the door detection device 80 and directly provide the corresponding power adjustment signal to the power amplifier circuit 70.

[0063] Furthermore, in this embodiment, the door detection device 80 is also used to send a second door detection signal to the controller 20 when it detects that one of the doors of the first battery compartment BD1 and the second battery compartment BD2 is not closed;

[0064] The controller 20 is also used to send a corresponding low-power setting signal to the power amplifier circuit 70 when it receives the second door detection signal, so as to reduce the current amplification gain of the power amplifier circuit 70 to a preset current amplification gain.

[0065] It is easy to understand that the second door detection signal is used to characterize the state where the two doors of the first battery compartment BD1 and the second battery compartment BD2 are in a closed-open state, that is, only the first battery pack B1 or only the second battery pack B2 has been filled. The preset current amplification gain refers to a pre-set, low current amplification gain that ensures the power amplifier circuit 70 operates based on the lowest possible input power. In this embodiment, if one of the first battery compartments BD1 and the second battery compartment BD2 is unfilled, the door detection device 80 generates a second door detection signal and transmits it to the controller 20. When the controller 20 receives the second door detection signal, it assumes that only the first battery pack B1 or only the second battery pack B2 has been filled. At this time, it can be considered that only one battery pack can actually provide the target voltage, that is, it cannot provide the high-current target voltage for the power amplifier circuit 70. The controller 20 can output a specific low-power setting signal to the power amplifier circuit 70 to reduce the current amplification gain of the power amplifier circuit 70 to the preset current amplification gain, thereby ensuring that the power amplifier circuit 70 can operate normally.

[0066] Furthermore, in this embodiment, the power supply circuit also includes: a notification circuit 90;

[0067] The prompt circuit 90 is connected to the controller 20;

[0068] The door detection device 80 is also used to send a third door detection signal to the controller 20 when it is detected that the door of the first battery compartment BD1 and the door of the second battery compartment BD2 are not closed.

[0069] The controller 20 is also used to send a prompt signal to the prompt circuit 90 when it receives a second door detection signal or a third door detection signal;

[0070] The prompting circuit 90 is used to prompt the user that at least one compartment door is not closed when a prompting signal is received.

[0071] It should be noted that the third door detection signal is used to indicate that neither the door of the first battery compartment BD1 nor the second battery compartment BD2 is closed, or it can be understood as neither the first battery pack B1 nor the second battery pack B2 has been fully loaded. In this embodiment, when the controller 20 receives the second door detection signal, it can assume that one door of the first battery compartment BD1 and the second battery compartment BD2 is not closed, or it can be understood as only one battery pack is connected to the power supply circuit; when the controller 20 receives the third door detection signal, it can assume that neither the door of the first battery compartment BD1 nor the second battery compartment BD2 is closed, or it can be understood as neither the first battery pack B1 nor the second battery pack B2 is connected to the power supply circuit. At this time, the current provided by the voltage conversion circuit 30 to the power amplifier circuit 70 is insufficient to support its high-power output to the load 50. The controller 20 can send a corresponding prompt signal to the prompt circuit 90 to prompt the user that at least one door of the first battery compartment BD1 and the second battery compartment BD2 is not closed, that is, at least one battery pack of the first battery pack B1 and the second battery pack B2 is not connected to the power supply circuit.

[0072] It is readily understood that in this embodiment, the prompt signal can be at least one of a physical signal, such as a light signal, a sound signal, or a voice signal. As a special case, the prompt signal can also be an electromagnetic wave signal. The prompt circuit 90 has communication capabilities and can wirelessly communicate with the user's electronic watch, mobile phone, or other terminal devices. The prompt signal can be remotely sent to the terminal device via wireless communication, thereby controlling the terminal device to prompt the user.

[0073] Furthermore, to achieve the above objectives, this application also proposes a power supply device, which employs all embodiments of the power supply circuit described above. Compared with the prior art, the beneficial effects of the power supply device provided in this application are the same as those of the power supply circuit provided in the above embodiments, and other technical features in the power supply device are the same as those disclosed in the above embodiments, and will not be repeated here.

[0074] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent scope of this application.

Claims

1. A power supply circuit, characterized in that, The power supply circuit includes: a first battery pack, a second battery pack, a switching circuit, a voltage conversion circuit, and a controller; The first terminal of the switching circuit, the first battery pack, the second battery pack, the voltage conversion circuit, and the input terminal of the controller are used to connect to the power supply. The second terminal of the switching circuit and the output terminal of the voltage conversion circuit are connected to the load. The controller is connected to the switching circuit and the voltage conversion circuit respectively. The controller is configured to send a shutdown signal to the switching circuit and a control signal to the voltage conversion circuit when it does not receive the operating voltage provided by the power supply. The switching circuit is used to disconnect the connection between the power supply and the load when the shutdown signal is received. The voltage conversion circuit is configured to, upon receiving the control signal, convert at least one of the first voltage provided by the first battery pack and the second voltage provided by the second battery pack into a target voltage, and provide the target voltage to the load.

2. The power supply circuit as described in claim 1, characterized in that, The controller is further configured to send an enable signal to the switching circuit and stop sending the control signal to the voltage conversion circuit when it receives the operating voltage; The switching circuit is also used to connect the power supply and the load when the turn-on signal is received; The voltage conversion circuit is also used to stop providing the target voltage to the load when the control signal is not received.

3. The power supply circuit as described in claim 1, characterized in that, The voltage conversion circuit includes: a first boost module and a second boost module; The input terminal of the first boost module is connected to the first battery pack, and the output terminal of the first boost module is connected to the load; the input terminal of the second boost module is connected to the second battery pack, and the output terminal of the second boost module is connected to the load; the control terminals of the first boost module and the second boost module are respectively connected to the controller. The control signal includes a first control signal and a second control signal; The controller is configured to send the first control signal to the first boost module and the second control signal to the second boost module when the operating voltage is not received; The first boost module is configured to boost the first voltage provided by the first battery pack to the target voltage upon receiving the first control signal, and provide the target voltage to the load; The second boost module is configured to boost the second voltage provided by the second battery pack to the target voltage upon receiving the second control signal, and to provide the target voltage to the load.

4. The power supply circuit as described in claim 1, characterized in that, The power supply circuit also includes: a charging circuit; The input terminal of the charging circuit is used to connect to the power supply, the first output terminal of the charging circuit is connected to the first battery pack, and the second output terminal of the charging circuit is connected to the second battery pack. The charging circuit is used to convert the operating voltage into a charging voltage when it receives the operating voltage, and to provide the charging voltage to the first battery pack and the second battery pack respectively. The charging voltage is used to charge the first battery pack or the second battery pack.

5. The power supply circuit as described in claim 4, characterized in that, The charging circuit includes: a first charging module and a second charging module; The input terminals of the first charging module and the second charging module are used to connect to the power supply, the output terminal of the first charging module is connected to the first battery pack, and the output terminal of the second charging module is connected to the second battery pack. The first charging module is configured to convert the operating voltage into the charging voltage upon receiving the operating voltage, and provide the charging voltage to the first battery pack; The second charging module is used to convert the operating voltage into the charging voltage when it receives the operating voltage, and to provide the charging voltage to the second battery pack.

6. The power supply circuit as described in any one of claims 1 to 5, characterized in that, The power supply circuit also includes: a power amplifier circuit; The input terminal of the power amplifier circuit is connected to the output terminal of the switching circuit and the output terminal of the voltage conversion circuit, and the output terminal of the power amplifier circuit is connected to the load. The power amplifier circuit is used to amplify the current corresponding to the working voltage provided by the power supply or the current corresponding to the target voltage provided by the voltage conversion circuit based on the current amplification gain and then provide it to the load.

7. The power supply circuit as described in claim 6, characterized in that, The first battery pack is placed in the first battery compartment, the second battery pack is placed in the second battery compartment, and the interface between the first battery compartment and the second battery compartment is used to connect the power supply. The controller is also electrically connected to the power amplifier circuit; The power supply circuit also includes: a door detection device; The door detection device is electrically connected to the controller and is installed at the door of the first battery compartment and the door of the second battery compartment; The door detection device is used to send a first door detection signal to the controller when it detects that the door of the first battery compartment is closed and the door of the second battery compartment is closed; The controller is further configured to send a corresponding power adjustment signal to the power amplifier circuit when it receives the first door detection signal and receives a power adjustment command provided externally, so as to adjust the current amplification gain of the power amplifier circuit.

8. The power supply circuit as described in claim 7, characterized in that, The door detection device is also used to send a second door detection signal to the controller when it detects that one of the doors of the first battery compartment and the second battery compartment is not closed. The controller is further configured to send a corresponding low-power setting signal to the power amplifier circuit when it receives the second door detection signal, so as to reduce the current amplification gain of the power amplifier circuit to a preset current amplification gain.

9. The power supply circuit as described in claim 8, characterized in that, The power supply circuit also includes: a notification circuit; The prompting circuit is connected to the controller; The controller is also configured to send a prompt signal to the prompting circuit when it receives the second door detection signal; The notification circuit is used to notify the user that at least one compartment door is not closed when the notification signal is received.

10. A power supply device, characterized in that, The power supply device adopts the power supply circuit as described in any one of claims 1 to 9.

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