Power supply circuit and inflator pump

Abstract

The embodiment of the utility model provides a power supply circuit and an inflator pump, the power supply circuit is applied to the inflator pump, the inflator pump comprises a battery and a load module, and the power supply circuit comprises an external power supply detection module, an external power supply switch control module, a battery switch control module and a control module; wherein the external power supply detection module is connected with the control module, and the external power supply switch control module is connected with the load module and the control module; the control module is connected with the battery switch control module, and the battery is connected with the load module through the battery switch control module; the control module is used for receiving a detection signal sent by the external power supply detection module; and when the detection signal represents that the external power supply is connected to the power supply circuit, a first signal is sent to the external power supply switch control module, and a second signal is sent to the battery switch control module.

Description

Technical Field

[0001] The present application relates to the technical field of power supply, and in particular to a power supply circuit and an air pump. Background Art

[0002] An air pump is a tool that can achieve inflation or suction functions. The air pump usually achieves inflation or suction through loads such as motors. In order for the load to work, the load in the air pump needs to be powered by a battery. In the related art, there is only one way of power supply in air pump products, that is, the load can only be powered by a battery. When the product is in use, if the battery suddenly runs out of power, the load cannot work, causing the air pump to fail to work. Even if an external power supply is connected at this time, it is necessary to wait for the external power supply to charge the battery first, and wait until the battery recovers enough power before it can power the load to make the air pump work normally, resulting in the air pump being unable to resume work in time, affecting the efficiency and convenience of use. Utility Model Content

[0003] The embodiments of the present application provide a power supply circuit and an air pump.

[0004] The technical solution of the embodiment of the present application is implemented as follows:

[0005] In a first aspect, an embodiment of the present application provides a power supply circuit, which is applied to an air pump, wherein the air pump has a battery and a load module, and the power supply circuit includes: an external power supply detection module, an external power supply switch control module, a battery switch control module, and a control module; wherein:

[0006] The external power detection module is connected to the control module, the control module is connected to the external power switch control module, and the external power switch control module is also used to connect to the load module; the control module is also connected to the battery switch control module, and the battery is connected to the load module through the battery switch control module;

[0007] The control module is used to receive a detection signal sent by the external power supply detection module; when the detection signal indicates that an external power supply is connected to the power supply circuit, a first signal is sent to the external power supply switch control module, the first signal is used to control the external power supply switch control module to connect the external power supply and the load module so that the external power supply supplies power to the load module, and a second signal is sent to the battery switch control module, the second signal is used to control the battery switch control module to disconnect the battery and the load module so that the battery stops supplying power to the load module.

[0008] In a second aspect, an embodiment of the present application provides an air pump, comprising the power supply circuit, battery and load module provided in any embodiment of the present application, wherein the battery is connected to the battery switch control module and the load module respectively.

[0009] The power supply circuit provided in the embodiment of the present application provides two power supply modes for the air pump. The load can be powered by an external power supply or a battery. The power supply circuit can receive an external input power supply. In this way, the air pump can select the external power supply for power supply when there is an external power supply. There is no need to wait for the external power supply to charge the battery first and then supply power through the battery. The air pump can resume work in time, improve the efficiency and convenience of the use of the air pump, and when there is an external power supply, select the external power supply to power the air pump while shutting off the battery power supply path, avoiding the use of the battery for power supply when the external power supply is available, thereby extending the battery life and reducing the frequency of battery replacement or charging. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 A schematic diagram of the structure of the power supply circuit provided in the embodiment of the present application Figure 1 ;

[0011] Figure 2 A schematic diagram of the structure of the power supply circuit provided in the embodiment of the present application Figure 2 ;

[0012] Figure 3 A schematic diagram of the structure of the control module provided in an embodiment of the present application. DETAILED DESCRIPTION

[0013] The following will describe the technical solutions in the embodiments of the present application in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0014] It should be noted that in the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the embodiments of the present application, the character " / " generally indicates that the associated objects before and after are in an "or" relationship.

[0015] In the description of the embodiments of the present application, the term "corresponding" may indicate a direct or indirect correspondence between two items, or an association relationship between the two items, or a relationship between indication and being indicated, configuration and being configured, and the like.

[0016] To facilitate understanding of the technical solutions of the embodiments of the present application, the relevant technologies of the embodiments of the present application are described below. The following related technologies can be arbitrarily combined with the technical solutions of the embodiments of the present application as optional solutions, and they all belong to the protection scope of the embodiments of the present application.

[0017] In the related art, portable vehicle-mounted air pump products are designed with only one power supply control mode. When the battery of the product is suddenly out of power during use, the user cannot inflate, which seriously affects the experience during travel.

[0018] Figure 1 A schematic diagram of the structure of the power supply circuit provided in the embodiment of the present application is shown in FIG. Figure 1 As shown, an embodiment of the present application provides a power supply circuit, which is applied to an air pump. The air pump includes a battery and a load module. The power supply circuit includes: an external power detection module, an external power switch control module, a battery switch control module, and a control module; wherein,

[0019] The external power detection module is connected to the control module, the external power switch control module is connected to the load module and the control module; the control module is connected to the battery switch control module, and the battery is connected to the load module through the battery switch control module;

[0020] The external power supply detection module is used to detect whether the power supply circuit is connected to an external power supply, obtain a detection signal, and send the detection signal to the control module;

[0021] The control module is used to receive a detection signal sent by the external power supply detection module; when the detection signal indicates that an external power supply is connected to the power supply circuit, a first signal is sent to the external power supply switch control module, the first signal is used to control the external power supply switch control module to connect the external power supply and the load module so that the external power supply supplies power to the load module, and a second signal is sent to the battery switch control module, the second signal is used to control the battery switch control module to disconnect the battery and the load module so that the battery stops supplying power to the load module.

[0022] The external power supply is connected to the load module through the external power switch control module. When the external power supply is connected to the power supply circuit, the detection signal obtained by the external power detection module indicates that the external power supply is connected to the power supply circuit. After receiving the detection signal, the control module controls the external power switch control module through a first signal to connect the external power supply and the load module, and the external power supply starts to supply power to the load module. The battery switch control module is controlled through a second signal to disconnect the battery and the load module, and the battery stops supplying power to the load module.

[0023] In an embodiment of the present application, when the detection signal indicates that no external power supply is connected to the power supply circuit, the control module is also used to send a third signal to the battery switch control module, and the third signal is used to control the battery switch control module to connect the battery and the load module so that the battery supplies power to the load module.

[0024] When the detection signal indicates that no external power is connected to the power supply circuit, the control circuit is further used to send a fourth signal to the external power switch control module, and the fourth signal is used to control the external power switch control module to disconnect the external power supply and the load module.

[0025] When the power supply circuit has no external power supply connected, the control module controls the battery switch control module to turn on through the third signal, and controls the external power switch control module to turn off through the fourth signal, so that the battery supplies power to the load module to ensure the normal operation of the air pump.

[0026] Through the power supply circuit provided in the embodiment of the present application, two power supply modes are provided for the air pump. The load can be powered by an external power supply or a battery. The air pump can select the external power supply for powering when there is an external power supply, and there is no need to wait for the external power supply to charge the battery first and then power it by the battery. The air pump can resume work in time, thereby improving the efficiency and convenience of the use of the air pump. When there is an external power supply, the external power supply is selected to power the air pump while the battery power supply path is cut off, avoiding the use of the battery for powering when the external power supply is available, thereby extending the service life of the battery and reducing the frequency of battery replacement or charging.

[0027] In the embodiment of the present application, the power supply circuit further includes: a load parameter sampling module and a load power control module; wherein the load parameter sampling module is connected to the load module and the control module; the load power control module is connected to the load module and the control module;

[0028] The load parameter sampling module is used to sample the real-time working parameters of the load module, obtain a sampling signal, and send the sampling signal to the control module;

[0029] The control module is used to receive the sampling signal sent by the load parameter sampling module, and send a power control signal to the load power control module according to the sampling signal;

[0030] The load power control module is used to receive the power control signal sent by the control module, and adjust the power of the load module according to the power control signal.

[0031] The control module adjusts the power control signal sent to the load power control module based on the sampling signal sent by the load parameter sampling module. The load power control module adjusts the power of the load module according to the power control signal, so that the load module can operate within the normal power range, thereby extending the service life of the load module.

[0032] In the embodiment of the present application, the power supply circuit further includes an external power access module; the external power access module is connected to the external power switch control module and the external power detection module;

[0033] The external power access module is used to receive external power input.

[0034] Exemplarily, the external power access module includes an external power port and an anti-reverse connection module; wherein the external power port is used to receive external power access; the anti-reverse connection module connects the external access power supply and the external power switch control module to prevent reverse connection when the external power supply is inserted into the power port, thereby preventing damage to the equipment.

[0035] In an optional implementation manner of the present application, the external power supply detection module may also be connected to the external power supply access module to detect whether the power supply circuit is connected to an external power supply.

[0036] In the embodiment of the present application, the control module includes: an external power switch control terminal, an external power input detection terminal, and a battery power switch control terminal; wherein,

[0037] The external power switch control terminal is connected to the external power switch control module, the external power input detection terminal is connected to the external power detection module, and the battery power switch control terminal is connected to the battery switch control module.

[0038] In an embodiment of the present application, the control module also includes a motor drive switch control terminal and a motor drive signal input detection terminal; wherein the motor drive switch control terminal is connected to the load power control module for sending a power control signal to the load power control module, and the motor drive signal input detection terminal is connected to the load parameter sampling module for receiving a sampling signal sent by the load parameter sampling module.

[0039] In the embodiment of the present application, the power supply circuit further includes a battery detection module, which is connected to the battery to detect the battery voltage output by the battery to the load module, obtain a battery voltage signal, and send the battery voltage signal to the control module;

[0040] The control module is connected to the battery detection module to receive the battery voltage signal. When the battery supplies power to the load module, the control module can adjust the power control signal sent to the load power control module according to the battery voltage signal to control the load module to operate within a normal power range.

[0041] In the embodiment of the present application, the control module further includes a battery input detection terminal; the battery input detection terminal is connected to the battery detection module to receive the battery voltage signal.

[0042] In the embodiment of the present application, the load module includes a motor drive circuit.

[0043] In the embodiment of the present application, the air pump may be a portable vehicle-mounted air pump.

[0044] refer to Figure 2 , Figure 2 A schematic diagram of the structure of the power supply circuit provided in the embodiment of the present application Figure 2 ,like Figure 2 As shown, DC_ADC is the detection signal obtained by the external power detection module when detecting the external input power supply, DC_C is the signal for controlling the on / off of the external power switch module, BAT_ADC is the battery voltage signal obtained by the battery detection module when detecting the battery input voltage, BAT_C is the signal for controlling the on / off of the battery switch control module, MD_EN is the power control signal, MD_ADC is the sampling signal for the load parameter sampling module to collect the working parameters of the load module, the DC+ and DC- ports are used to connect the external power supply, and the M+ and M- ports are used to connect the load module.

[0045] refer to Figure 2 The external power supply detection module includes a first resistor R1 and a voltage stabilizing module. The voltage stabilizing module is composed of a capacitor C70, a resistor R75 and an anti-static diode ESD11 in parallel. One end of R1 is connected to the external power supply access module and the external power switch control module. The other end of R1 is connected to the voltage stabilizing module and then grounded. The other end of R1 is connected to the control module for sending a detection signal DC_ADC to the control module. In this embodiment, DC_ADC is a sampling voltage signal. When there is an external input power supply, DC_ADC is a high level and there is a sampling voltage signal. When there is no external input power supply, DC_ADC is a low level.

[0046] Based on this, in an embodiment of the present application, the external power supply detection module includes: a first resistor and a voltage stabilizing module; one end of the first resistor is connected to the external power supply and the external power switch control module, the other end of the first resistor is connected to the control module, and the other end of the first resistor is connected to the voltage stabilizing module and then grounded.

[0047] It should be noted that Figure 2 The structure of the external power supply detection module is only an example. In actual application, the external power supply detection module can also adopt other detection circuits, among which the voltage stabilizing module can also adopt a voltage stabilizing tube or other voltage stabilizing circuits. The embodiments of the present application do not limit this.

[0048] refer to Figure 2 The external power switch control module includes a first MOS tube Q1 and a first drive circuit, and the first drive circuit includes a resistor R128, a resistor R127, a transistor Q8, a resistor R125, a transistor Q7, a resistor R126 and a resistor R124; wherein one end of the resistor R128 is connected to the control module, and is used to receive the DC_C signal (the first signal or the fourth signal) sent by the control module; in this embodiment, Vt is used to provide a bias voltage, the first signal is a high-level signal, and the fourth signal is a low-level signal. When the DC_C signal is the first signal, Q8 is triggered to turn on, and after Q8 is turned on, Q7 is triggered to turn on, and after Q7 is turned on, Q1 is triggered to turn on, and the external power supply is connected to the load module, and the external power supply starts to supply power to the load module; when the DC_C signal is the fourth signal, Q8 is triggered to turn off, and after Q8 is turned off, Q7 is triggered to turn off, and after Q7 is turned off, Q1 is triggered to turn off, and the external power supply is disconnected from the load module, and the external power supply stops supplying power to the load module.

[0049] Based on this, in an embodiment of the present application, the external power switch control module includes: a first MOS tube and a first drive circuit; the source of the first MOS tube is connected to the external power supply and the external power detection module, the drain of the first MOS tube is connected to the load module, the gate of the first MOS tube is connected to the first drive circuit, and the first drive circuit is connected to the control module.

[0050] It should be noted that Figure 2 The structure of the external power switch control module in the embodiment is only an example. In actual application, other switch modules may also be used. Among them, the first drive circuit may also adopt drive circuits of other structures. This application does not limit this.

[0051] refer to Figure 2The battery switch control module includes a second MOS tube Q2 and a second drive circuit. The second drive circuit includes a resistor R132, a resistor R131, a transistor Q17, a resistor R129, a transistor Q16, a resistor R130 and a resistor R123. The first end of the resistor R131 is connected to the control module for receiving a BAT_C signal (a second signal or a third signal) sent by the control module. In this embodiment, Vt is used to provide a bias voltage. The second signal is a low-level signal, and the third signal is a high-level signal. When the BAT_C signal is the third signal, Q17 is triggered to turn on. After Q17 is turned on, Q16 is triggered to turn on. After Q16 is turned on, Q2 is triggered to turn on. The battery is connected to the load module, and the battery starts to supply power to the load module. When the BAT_C signal is the second signal, Q17 is triggered to turn off. After Q17 is turned off, Q16 is triggered to turn off. After Q16 is turned off, Q2 is triggered to turn off. The battery is disconnected from the load module, and the battery stops supplying power to the load module.

[0052] Based on this, in an embodiment of the present application, the battery switch control module includes: a second MOS tube and a second drive circuit; the source of the second MOS tube is connected to the battery, and the drain of the second MOS tube is connected to the load module; the gate of the second MOS tube is connected to the second drive circuit, and the second drive circuit is connected to the control module.

[0053] It should be noted that Figure 2 The structure of the battery switch control module in the figure is only an example. In actual application, other switch modules can also be used. Among them, the second drive circuit can also use a drive circuit of other structure, and this application does not limit this.

[0054] refer to Figure 2 The battery detection module includes a resistor R6 and a voltage stabilizing module. The voltage stabilizing module is composed of a capacitor C5, a resistor R15 and an anti-static diode ESD1 in parallel. One end of R15 is connected to the battery and the battery switch control module, and the other end of R15 is connected to the voltage stabilizing module and then grounded. The other end of R15 is connected to the control module for sending a battery voltage detection signal to the control module.

[0055] It should be noted that Figure 2 The structure of the battery detection module is only an example. In actual application, the battery detection module may also adopt other detection modules, wherein the voltage stabilizing module may also adopt a voltage stabilizing tube or other voltage stabilizing circuits, and the embodiments of the present application do not limit this.

[0056] refer to Figure 2The load power control module includes a second resistor R2, a third resistor R3 and a third MOS tube Q3, one end of R2 is connected to the control module, and is used to receive the power control signal MD_EN sent by the control module, the other end of R2 is connected to one end of R3 and the gate of Q3, the other end of R3 is grounded, the drain of Q3 is connected to the load module, and the source of Q3 is connected to the load parameter sampling module. In the embodiment of the present application, when MD_EN is a high-level signal, Q3 is turned on, the load module is powered on, and the working power of the load module is increased. When MD_EN is a low-level signal, Q3 is turned off, the load module is powered off, and the working power of the load module is reduced.

[0057] It should be noted that Figure 2 The structure of the load power control module in the figure is only an example. In actual application, the load power control module may also adopt other power control circuits, and the embodiments of the present application do not limit this.

[0058] refer to Figure 2 The load parameter sampling module includes a fourth resistor R4 and a filtering circuit; the filtering circuit is a π-type filtering circuit, including a capacitor C16, a capacitor C17 and an inductor L2. The load parameter sampling module is connected to the load module through the load power control module, the source of Q1 is connected to one end of R3, and the other end of R4 is grounded; one end of C16 and one end of C17 are connected and then grounded, the other end of C16 is connected to the other end of R4 and one end of L2, the other end of C17 is connected to the other end of L2, and the other end of L2 is connected to the control module for sending a sampling signal to the control module.

[0059] It should be noted that Figure 2 The structure of the load parameter sampling module in the figure is only an example. In actual application, the load parameter sampling module may also adopt other sampling circuits, and the embodiments of the present application do not limit this.

[0060] refer to Figure 2 The external power access module includes: power ports DC+, DC- and an anti-reverse connection module, wherein the anti-reverse connection module includes a resistor R133, a resistor R134, a diode D2, a MOS tube Q19, and a MOS tube Q18. The power port is used to connect an external power supply DC; one end of R133 and one end of C10 are connected to the external power switch control module.

[0061] Preferably, in the embodiment of the present application, the voltage of the external power supply DC is 12V, and the bias voltage Vt is 18V.

[0062] refer to Figure 3 , Figure 3 A schematic diagram of the structure of the control module provided in the embodiment of the present application is shown in FIG. Figure 3As shown, the control circuit includes an MCU and peripheral circuits of the MCU. The MCU includes an external power switch control terminal, an external power input detection terminal, a battery input detection terminal, a battery power switch control terminal, a motor drive switch control terminal and a motor drive signal input detection terminal; wherein the external power switch control terminal is connected to the external power switch control module, and is used to send a DC_C signal to the external power switch control module to control the external power switch control module to connect or disconnect the external power supply and the load module; the external power input detection terminal is connected to the external power detection module, and is used to receive a DC_ADC signal to determine whether there is an external power input; the battery input detection terminal is connected to the battery detection module, and is used to receive a BAT_ADC signal to determine the input voltage of the battery to the load module; the battery power switch control terminal is connected to the battery switch control module, and is used to send a BAT_C signal to the battery switch control module to control the battery switch control module to connect or disconnect the battery and the load module; the motor drive switch control terminal is connected to the load power control module, and is used to receive a sampling signal, and according to the sampling signal, sends an MD_EN signal to the load power control module to adjust the power of the load module; the motor drive signal input detection terminal is connected to the load parameter sampling module, and is used to receive a sampling signal MD_ADC to collect the working parameter information of the load module.

[0063] It should be noted that Figure 3 The structure of the control module in the figure is only an example. In actual application, other control circuits may also be used, and this application does not limit this.

[0064] The power supply circuit provided in the embodiment of the present application provides two power supply modes for the air pump. The load can be powered by an external power supply or a battery. The power supply circuit can receive an external input power supply. In this way, the air pump can select the external power supply for power supply when there is an external power supply. There is no need to wait for the external power supply to charge the battery first and then supply power through the battery. The air pump can resume work in time, improve the efficiency and convenience of the use of the air pump, and when there is an external power supply, select the external power supply to power the air pump while shutting off the battery power supply path, avoiding the use of the battery for power supply when the external power supply is available, thereby extending the battery life and reducing the frequency of battery replacement or charging.

[0065] An embodiment of the present application also provides an air pump, which includes a power supply circuit, a battery, and a load module provided in any embodiment of the present application; wherein a battery switch control module in the power supply circuit connects the battery and the load module.

[0066] In the several embodiments provided in the present application, it should be understood that the disclosed systems and devices can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0067] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0068] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A power supply circuit, characterized in that: Applied to an air pump, the air pump includes a battery and a load module, the power supply circuit includes: an external power detection module, an external power switch control module, a battery switch control module, and a control module; wherein, The external power detection module is connected to the control module, the external power switch control module is connected to the load module and the control module; the control module is connected to the battery switch control module, and the battery switch control module connects the battery and the load module; The external power supply detection module is used to detect whether the power supply circuit is connected to an external power supply, obtain a detection signal, and send the detection signal to the control module; The control module is used to receive a detection signal sent by the external power supply detection module; when the detection signal indicates that an external power supply is connected to the power supply circuit, a first signal is sent to the external power supply switch control module, the first signal is used to control the external power supply switch control module to connect the external power supply and the load module so that the external power supply supplies power to the load module, and a second signal is sent to the battery switch control module, the second signal is used to control the battery switch control module to disconnect the battery and the load module so that the battery stops supplying power to the load module.

2. The power supply circuit according to claim 1, characterized in that: When the detection signal indicates that no external power supply is connected to the power supply circuit, the control module is also used to send a third signal to the battery switch control module, and the third signal is used to control the battery switch control module to connect the battery and the load module so that the battery supplies power to the load module.

3. The power supply circuit according to claim 2, characterized in that: When the detection signal indicates that no external power supply is connected to the power supply circuit, the control module is also used to send a fourth signal to the external power switch control module, and the fourth signal is used to control the external power switch control module to disconnect the external power supply and the load module so that the external power supply stops supplying power to the load module.

4. The power supply circuit according to claim 1, characterized in that: The power supply circuit further includes: a load parameter sampling module and a load power control module; wherein the load parameter sampling module is connected to the load module and the control module; the load power control module is connected to the load module and the control module; The load parameter sampling module is used to sample the real-time working parameters of the load module, obtain a sampling signal, and send the sampling signal to the control module; The control module is used to receive the sampling signal sent by the load parameter sampling module, and send a power control signal to the load power control module according to the sampling signal; The load power control module is used to receive the power control signal sent by the control module, and adjust the power of the load module according to the power control signal.

5. The power supply circuit according to claim 4, characterized in that: The power supply circuit further includes: an external power access module; the external power access module is connected to the external power switch control module and the external power detection module; The external power access module is used to receive external power input.

6. The power supply circuit according to claim 1, characterized in that: The external power supply detection module includes: a first resistor and a voltage stabilizing module; one end of the first resistor is connected to the external power supply and the external power switch control module, the other end of the first resistor is connected to the control module, and the other end of the first resistor is connected to the voltage stabilizing module and then grounded.

7. The power supply circuit according to claim 1, characterized in that: The external power switch control module includes: a first MOS tube and a first drive circuit; the source of the first MOS tube is connected to the external power supply and the external power detection module, the drain of the first MOS tube is connected to the load module, the gate of the first MOS tube is connected to the first drive circuit, and the first drive circuit is connected to the control module.

8. The power supply circuit according to claim 1, characterized in that: The battery switch control module includes: a second MOS tube and a second drive circuit; the source of the second MOS tube is connected to the battery, and the drain of the second MOS tube is connected to the load module; the gate of the second MOS tube is connected to the second drive circuit, and the second drive circuit is connected to the control module.

9. The power supply circuit according to claim 1, characterized in that: The control module includes: an external power switch control terminal, an external power input detection terminal, and a battery power switch control terminal; wherein, The external power switch control terminal is connected to the external power switch control module, the external power input detection terminal is connected to the external power detection module, and the battery power switch control terminal is connected to the battery switch control module.

10. An air pump, characterized in that: It comprises a power supply circuit, a battery and a load module as claimed in any one of claims 1 to 9, wherein a battery switch control module in the power supply circuit connects the battery and the load module.

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