Air pump control circuit

Abstract

The utility model discloses a kind of air pump control circuit, it is related to air pump control technical field, to solve the problem of the lack of complete and stable control circuit of existing air pump;A kind of air pump control circuit, including the main control MCU and battery connected with air pump respectively, battery is connected with charging module and discharging module respectively, charging module is connected with charging interface, main control MCU is connected with power module, power module is connected with battery, main control MCU is also connected with key signal acquisition device and total pressure signal acquisition device.According to the real-time voltage of battery pack read by main control MCU, prohibit user to use when cell voltage is too low;Main control MCU can calculate the real-time current of pump by voltage acquisition, and then according to the actual demand of current control, and using PWN output drive discharging module;Ensure the control of lithium battery charging and discharging.

Description

Technical Field

[0001] This utility model relates to the field of air pump control technology, specifically to an air pump control circuit. Background Technology

[0002] An air pump is an essential component of any inflatable product. Most existing portable vacuum pumps are powered by lithium batteries, but lack corresponding control circuits and control strategies; for example, Chinese patent CN220522821U, although involving a portable mini electric pump, does not cover the pump's control circuitry. Utility Model Content

[0003] This invention solves the problem of existing air pumps lacking a complete and stable control circuit. It proposes an air pump control circuit that ensures control over the charging and discharging of lithium batteries and avoids pump damage by limiting the maximum current.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: an air pump control circuit, comprising a main control MCU and a battery respectively connected to the air pump, wherein the battery is respectively connected to a charging module and a discharging module, the charging module is connected to a charging interface, the main control MCU is connected to a power module, the power module is connected to the battery, and the main control MCU is also connected to a button signal acquisition device and a total pressure signal acquisition device.

[0005] In this technical solution, the main control MCU can read the real-time voltage of the battery and prohibit the user from using it when the cell voltage is too low; and the main control MCU can calculate the real-time current of the pump through voltage acquisition, and then use PWM output to drive the discharge module according to the actual needs of current control.

[0006] The present invention is further configured such that: the charging module includes a charging management module, an inductor L is provided and connected between the charging interface and the charging management module, and the charging management module has a built-in charging management chip U1.

[0007] In this technical solution, a Type-C USB interface is used as the charging interface, with an input voltage of 5V. The battery is charged using the 5V input through the charging management chip U1 and the inductor L.

[0008] The present invention is further configured such that: the power module is also connected to a charging interface and an inductor L respectively; the power module includes a voltage conversion chip U3; and a number of parallel capacitors are provided between the output terminal and the ground terminal or between the input terminal and the ground terminal of the voltage conversion chip U3.

[0009] In this technical solution, the power module can complete voltage conversion through the voltage conversion chip U3, output 5V voltage, and supply power to the main control MCU.

[0010] The present invention is further configured such that: the discharge module is connected to the main control MCU, and the discharge module includes a number of transistors connected in stages and a MOS transistor Q2 connected to the emitter of the last transistor.

[0011] In this technical solution, PWM output is used to drive transistors and MOSFETs in stages.

[0012] The present invention is further configured such that: one end of the air pump is a VBAT terminal, the VBAT terminal is connected to the battery, the other end of the air pump is connected to a MOS transistor Q, the gate of the MOS transistor Q is connected to the main control MCU, and the source resistor of the MOS transistor Q is RS1.

[0013] The present invention is further configured such that: the first and second pins of the main control MCU are connected to the sampling terminal of the discharge module, and the PWM control pin of the main control MCU is connected to the control terminal of the discharge module.

[0014] In this technical solution, the first and second pins of the main control MCU are acquisition pins, which can acquire the voltage of resistor RS1.

[0015] The present invention is further configured such that: the nineteenth pin of the main control MCU is connected to the resistor R7 of the charging module, and the other end of the resistor R7 is connected to the power management chip U1; the eighteenth pin of the main control MCU is connected to the resistor R1 of the charging module, and the other end of the resistor R1 is connected to the charging interface.

[0016] In this technical solution, the bottom eighteenth and nineteenth pins of the main control MCU are both connected to the charging module.

[0017] The present invention is further configured such that: the key signal acquisition device includes a capacitor C12, one end of the capacitor C12 is connected to the main control MCU and a resistor R12 respectively, the other end of the capacitor C12 is grounded, the other end of the resistor R12 is connected to a resistor R10, and the resistor R10 is connected to the power supply terminal.

[0018] In this technical solution, human-computer interaction can be achieved through a button signal acquisition device.

[0019] The present invention is further configured such that: the total voltage signal acquisition device includes resistors R11 and R13 connected together, the other end of resistor R13 is connected to capacitor C11 and ground respectively, and the other end of capacitor C11 is connected to one end of resistor R13 and the main control MCU respectively.

[0020] The present invention is further configured to include a dual-color LED device, which is connected to the main control MCU.

[0021] In this technical solution, LEDs are used to indicate and prompt users to charge.

[0022] This utility model can bring the following beneficial effects:

[0023] The main control MCU reads the real-time voltage of the battery pack and prohibits user operation when the cell voltage is too low. The main control MCU can calculate the real-time current of the pump through voltage acquisition, and then use PWM output to drive the discharge module according to the actual needs of current control, so as to ensure the control of lithium battery charging and discharging. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the framework of an air pump control circuit according to this application.

[0025] Figure 2 This is a schematic diagram of a charging module for an air pump control circuit according to this application.

[0026] Figure 3 This is a schematic diagram of a discharge module for an air pump control circuit according to this application.

[0027] Figure 4 This is a schematic diagram of a power supply module for an air pump control circuit according to this application.

[0028] Figure 5 This is a schematic diagram of the main control MCU of an air pump control circuit according to this application.

[0029] Figure 6 This is a schematic diagram of a dual-color LED device for an air pump control circuit according to this application.

[0030] Figure 7 This is a schematic diagram of a button signal acquisition device for an air pump control circuit according to this application.

[0031] Figure 8 This is a schematic diagram of a total pressure signal acquisition device for an air pump control circuit according to this application. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only one preferred embodiment of this utility model and are only used to explain this utility model. They do not limit the scope of protection of this utility model. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0033] Example 1

[0034] To address the shortcomings of existing technologies, this embodiment proposes an air pump control circuit, referring to... Figure 1 It mainly includes a main control MCU, a battery, a charging module, and a discharging module. The main control MCU and the battery are both connected to the air pump. The charging module and the discharging module are both connected to the battery. The charging module is also connected to the charging interface. The main control MCU is also connected to the power module. The power module is connected to the battery. The main control MCU is connected to the button signal acquisition device and the total voltage signal acquisition device.

[0035] In this embodiment, the charging interface is a USB interface.

[0036] refer to Figure 2 The charging module mainly includes a charging management module. An inductor L is connected between the charging management module and the charging interface. The charging management module also includes a charging management chip U1.

[0037] In this technical solution, a Type-C USB interface is used as the charging interface, with an input voltage of 5V. The charging management chip U1 and inductor L enable 5V charging of the battery (in this embodiment, two series-connected lithium batteries). The main function of the charging management chip U1 is to boost the voltage before charging, and it also incorporates basic lithium battery charging management functions such as trickle charging, CC charging, and CV charging. It is then connected to the main control MCU to indicate the charging status.

[0038] Continue to refer to Figure 2 For the charging module and charging interface, more detailed information is needed. The charging interface is J1 in the diagram. Ports A9 and B9 of the charging interface J1 are connected to resistor R1, which is used to connect to the main control MCU. Port A5 of the charging interface J1 is connected in series with resistor R6 and then grounded. Port B5 of the charging interface J1 is connected in series with resistor R5 and then grounded. Ports A12 and B12 of the charging interface J1 are grounded.

[0039] The A9 and B9 ports of the charging interface J1 are also connected to the diode TVS1, and the other end of the diode TVS1 is grounded.

[0040] The A9 and B9 ports from the charging interface J1 are also connected to resistor R3, and the other end of resistor R3 is grounded.

[0041] The A9 and B9 ports of the charging interface J1 are also connected to capacitors C7 and C23 connected in parallel, and the other end of capacitors C7 and C23 connected in parallel is grounded.

[0042] The A9 and B9 ports of the charging interface J1 are also connected to the inductor L. The other end of the inductor L is connected to the capacitor C5, the eighth pin and the capacitor C22 of the charging management chip U1 respectively. The other end of the capacitor C22 is connected to the resistor R23. The other end of the capacitor R23 is grounded. The other end of the capacitor C5 is connected to the seventh pin of the charging management chip U1.

[0043] The A9 and B9 ports of the charging interface J1 are also directly connected to the resistor R2. The other end of the resistor R2 is connected to the capacitor C8 and the sixth pin of the charging management chip U1, respectively. The other end of the capacitor C8 is grounded. The fifth pin of the charging management chip U1 is connected to the main control MCU after being connected to the resistor R7.

[0044] The first pin of the charging management chip U1 is connected to capacitors C1, C2, C3, and C4 connected in parallel, with the other ends of these capacitors grounded. The second pin of the charging management chip U1 is connected to capacitor C6 and then grounded. The third pin of the charging management chip U1 is connected to resistor R19 and then grounded. The third pin of the charging management chip U1 is also connected to resistor R4 and then grounded.

[0045] refer to Figure 4 For the power module, it is connected to the charging interface and the inductor L respectively. The power module includes a voltage conversion chip U3. Several parallel capacitors are provided between the output terminal and the ground terminal or the input terminal and the ground terminal of the voltage conversion chip U3.

[0046] Specifically, the power module also includes diodes D2 and D3. The output terminals of diodes D2 and D3 are connected to the input terminal of voltage conversion chip U3. The input terminal of voltage conversion chip U3 is also connected to capacitors C18 and C19 connected in parallel. The other ends of capacitors C18 and C19 are grounded. The output terminal of voltage conversion chip U3 is connected to capacitors C20 and C21 connected in parallel. The other ends of capacitors C20 and C21 are grounded. The output terminal of voltage conversion chip U3 is also connected to a 5V power supply terminal.

[0047] In this technical solution, the power module can complete voltage conversion through the voltage conversion chip U3, output 5V voltage, and supply power to the main control MCU.

[0048] The main function of the voltage conversion chip U3 in the power module is voltage conversion. It connects the 5V input of the USB interface and the VBAT input of the battery pack in parallel to provide a stable 5V power supply to the main control MCU, ensuring that the main control MCU can work normally when the lithium battery pack voltage is too low.

[0049] refer to Figure 3The discharge module is connected to the main control MCU. The discharge module includes several transistors connected in stages and a MOSFET Q2 connected to the emitter of the last transistor.

[0050] One end of battery CN1 is connected to capacitor C9, and the other end of capacitor C9 is connected to the other end of battery CN1 and grounded. One end of capacitor C9 is connected to resistor R16 and the emitter of transistor Q1. The other end of resistor R16 is connected to resistor R24. The other end of resistor R24 ​​is connected to the collector of transistor Q3. The base of transistor Q3 is connected to resistor R17 and resistor R22. The other end of resistor R17 is connected to the main control MCU. The other end of resistor R22 is grounded. The emitter of transistor Q3 is grounded.

[0051] The base of transistor Q1 is connected to the other end of resistor R16. The collector of transistor Q1 is connected to diode D4, the base of transistor Q4, and resistor R21. The other end of diode D4 is connected to resistor R20. The other end of resistor R20 is connected to resistor R18 and MOSFET Q2.

[0052] The emitter of transistor Q4 is connected to resistor R18 and then to MOSFET Q2. The collector of transistor Q4 is connected to the other end of resistor R21. The collector of transistor Q4 is also connected to MOSFET Q2 and resistor RS1. The other end of resistor RS1 is grounded.

[0053] The MOSFET Q2 is also connected to a capacitor C10 and a diode D1 connected in parallel. The other end of the parallel capacitor C10 and diode D1 is connected to one end of the battery CN1.

[0054] One end of resistor RS1 is connected to resistor R15, and the other end of resistor R15 is connected to the main control MCU and capacitor C15 respectively. The other end of capacitor C15 is grounded.

[0055] The other end of resistor RS1 is connected to resistor R14, and the other end of resistor R14 is connected to the main control MCU and capacitor C14 respectively. The other end of capacitor C14 is grounded.

[0056] In this technical solution, PWM output is used to drive transistors and MOSFETs in stages.

[0057] refer to Figure 1 One end of the air pump is the VBAT terminal, which is connected to the battery. The other end of the air pump is connected to the MOSFET Q. The gate of the MOSFET Q is connected to the main control MCU. The source resistor of the MOSFET Q is RS1.

[0058] refer to Figure 5 The first and second pins of the main control MCU are both connected to the sampling terminal of the discharge module, and the PWM control pin of the main control MCU is connected to the control terminal of the discharge module.

[0059] In this technical solution, the first and second pins of the main control MCU are acquisition pins, which can acquire the voltage of resistor RS1.

[0060] Pin 19 of the main control MCU is connected to resistor R7 of the charging module, and the other end of resistor R7 is connected to the charging management chip U1; pin 18 of the main control MCU is connected to resistor R1 of the charging module, and the other end of resistor R1 is connected to the charging interface.

[0061] refer to Figure 7 The button signal acquisition device includes a capacitor C12. One end of the capacitor C12 is connected to the main control MCU and the resistor R12 respectively. The other end of the capacitor C12 is grounded. The other end of the resistor R12 is connected to the resistor R10. The resistor R10 is also connected to the 5V power supply terminal. The other end of the resistor R10 is also grounded through a switch.

[0062] refer to Figure 8 The total voltage signal acquisition device includes resistors R11 and R13 connected together. The other end of resistor R13 is connected to capacitor C11 and ground, respectively. The other end of capacitor C11 is connected to one end of resistor R13 and the main control MCU. Specifically, it is connected to pin 15 of the main control MCU.

[0063] Example 2

[0064] This embodiment proposes an air pump control circuit, including a main control MCU, a battery, a charging module, and a discharging module. The main control MCU and the battery are both connected to the air pump, the charging module and the discharging module are both connected to the battery, the charging module is also connected to a charging interface, the main control MCU is also connected to a power module, the power module is connected to the battery, and the main control MCU is connected to a button signal acquisition device and a total pressure signal acquisition device.

[0065] In this embodiment, the charging interface is a USB interface.

[0066] refer to Figure 2 The charging module mainly includes a charging management module. An inductor L is connected between the charging management module and the charging interface. The charging management module also includes a charging management chip U1.

[0067] In this technical solution, a Type-C USB interface is used as the charging interface, with an input voltage of 5V. The charging management chip U1 and inductor L enable 5V charging of the battery (in this embodiment, two series-connected lithium batteries). The main function of the charging management chip U1 is to boost the voltage before charging, and it also incorporates basic lithium battery charging management functions such as trickle charging, CC charging, and CV charging. It is then connected to the main control MCU to indicate the charging status.

[0068] Continue to refer to Figure 2 For the charging module and charging interface, more detailed information is needed. The charging interface is J1 in the diagram. Ports A9 and B9 of the charging interface J1 are connected to resistor R1, which is used to connect to the main control MCU. Port A5 of the charging interface J1 is connected in series with resistor R6 and then grounded. Port B5 of the charging interface J1 is connected in series with resistor R5 and then grounded. Ports A12 and B12 of the charging interface J1 are grounded.

[0069] The A9 and B9 ports of the charging interface J1 are also connected to the diode TVS1, and the other end of the diode TVS1 is grounded.

[0070] The A9 and B9 ports from the charging interface J1 are also connected to resistor R3, and the other end of resistor R3 is grounded.

[0071] The A9 and B9 ports of the charging interface J1 are also connected to capacitors C7 and C23 connected in parallel, and the other end of capacitors C7 and C23 connected in parallel is grounded.

[0072] The A9 and B9 ports of the charging interface J1 are also connected to the inductor L. The other end of the inductor L is connected to the capacitor C5, the eighth pin and the capacitor C22 of the charging management chip U1 respectively. The other end of the capacitor C22 is connected to the resistor R23. The other end of the capacitor R23 is grounded. The other end of the capacitor C5 is connected to the seventh pin of the charging management chip U1.

[0073] The A9 and B9 ports of the charging interface J1 are also directly connected to the resistor R2. The other end of the resistor R2 is connected to the capacitor C8 and the sixth pin of the charging management chip U1, respectively. The other end of the capacitor C8 is grounded. The fifth pin of the charging management chip U1 is connected to the main control MCU after being connected to the resistor R7.

[0074] The first pin of the charging management chip U1 is connected to capacitors C1, C2, C3, and C4 connected in parallel, with the other ends of these capacitors grounded. The second pin of the charging management chip U1 is connected to capacitor C6 and then grounded. The third pin of the charging management chip U1 is connected to resistor R19 and then grounded. The third pin of the charging management chip U1 is also connected to resistor R4 and then grounded.

[0075] refer to Figure 4 For the power module, it is connected to the charging interface and the inductor L respectively. The power module includes a voltage conversion chip U3. Several parallel capacitors are provided between the output terminal and the ground terminal or the input terminal and the ground terminal of the voltage conversion chip U3.

[0076] Specifically, the power module also includes diodes D2 and D3. The output terminals of diodes D2 and D3 are connected to the input terminal of voltage conversion chip U3. The input terminal of voltage conversion chip U3 is also connected to capacitors C18 and C19 connected in parallel. The other ends of capacitors C18 and C19 are grounded. The output terminal of voltage conversion chip U3 is connected to capacitors C20 and C21 connected in parallel. The other ends of capacitors C20 and C21 are grounded. The output terminal of voltage conversion chip U3 is also connected to a 5V power supply terminal.

[0077] In this technical solution, the power module can complete voltage conversion through the voltage conversion chip U3, output 5V voltage, and supply power to the main control MCU.

[0078] The main function of the voltage conversion chip U3 in the power module is voltage conversion. It connects the 5V input of the USB interface and the VBAT input of the battery pack in parallel to provide a stable 5V power supply to the main control MCU, ensuring that the main control MCU can work normally when the lithium battery pack voltage is too low.

[0079] refer to Figure 3 The discharge module is connected to the main control MCU. The discharge module includes several transistors connected in stages and a MOSFET Q2 connected to the emitter of the last transistor.

[0080] One end of battery CN1 is connected to capacitor C9, and the other end of capacitor C9 is connected to the other end of battery CN1 and grounded. One end of capacitor C9 is connected to resistor R16 and the emitter of transistor Q1. The other end of resistor R16 is connected to resistor R24. The other end of resistor R24 ​​is connected to the collector of transistor Q3. The base of transistor Q3 is connected to resistor R17 and resistor R22. The other end of resistor R17 is connected to the main control MCU. The other end of resistor R22 is grounded. The emitter of transistor Q3 is grounded.

[0081] The base of transistor Q1 is connected to the other end of resistor R16. The collector of transistor Q1 is connected to diode D4, the base of transistor Q4, and resistor R21. The other end of diode D4 is connected to resistor R20. The other end of resistor R20 is connected to resistor R18 and MOSFET Q2.

[0082] The emitter of transistor Q4 is connected to resistor R18 and then to MOSFET Q2. The collector of transistor Q4 is connected to the other end of resistor R21. The collector of transistor Q4 is also connected to MOSFET Q2 and resistor RS1. The other end of resistor RS1 is grounded.

[0083] The MOSFET Q2 is also connected to a capacitor C10 and a diode D1 connected in parallel. The other end of the parallel capacitor C10 and diode D1 is connected to one end of the battery CN1.

[0084] One end of resistor RS1 is connected to resistor R15, and the other end of resistor R15 is connected to the main control MCU and capacitor C15 respectively. The other end of capacitor C15 is grounded.

[0085] The other end of resistor RS1 is connected to resistor R14, and the other end of resistor R14 is connected to the main control MCU and capacitor C14 respectively. The other end of capacitor C14 is grounded.

[0086] In this technical solution, PWM output is used to drive transistors and MOSFETs in stages.

[0087] refer to Figure 1 One end of the air pump is the VBAT terminal, which is connected to the battery. The other end of the air pump is connected to the MOSFET Q. The gate of the MOSFET Q is connected to the main control MCU. The source resistor of the MOSFET Q is RS1.

[0088] refer to Figure 5 The first and second pins of the main control MCU are both connected to the sampling terminal of the discharge module, and the PWM control pin of the main control MCU is connected to the control terminal of the discharge module.

[0089] In this technical solution, the first and second pins of the main control MCU are acquisition pins, which can acquire the voltage of resistor RS1.

[0090] Pin 19 of the main control MCU is connected to resistor R7 of the charging module, and the other end of resistor R7 is connected to the charging management chip U1; pin 18 of the main control MCU is connected to resistor R1 of the charging module, and the other end of resistor R1 is connected to the charging interface.

[0091] refer to Figure 7 The button signal acquisition device includes a capacitor C12. One end of the capacitor C12 is connected to the main control MCU and the resistor R12 respectively. The other end of the capacitor C12 is grounded. The other end of the resistor R12 is connected to the resistor R10. The resistor R10 is also connected to the 5V power supply terminal. The other end of the resistor R10 is also grounded through a switch.

[0092] refer to Figure 8 The total voltage signal acquisition device includes resistors R11 and R13 connected together. The other end of resistor R13 is connected to capacitor C11 and ground, respectively. The other end of capacitor C11 is connected to one end of resistor R13 and the main control MCU. Specifically, it is connected to pin 15 of the main control MCU.

[0093] Based on Example 1, and referring to Figure 6This embodiment also includes a dual-color LED device, which is connected to the main control MCU. The dual-color LED device includes resistors R8 and R9. One end of resistor R8 is connected to pin 17 of the main control MCU, and one end of resistor R9 is connected to pin 16 of the main control MCU. The other ends of resistors R8 and R9 are both connected to LED1, and the other end of LED1 is grounded.

[0094] In this invention, a Type-C USB interface is used as the charging input port, with an input voltage of 5V. The charging management chip U1 and inductor L enable the 5V charging of two series-connected lithium batteries CN1. The main function of this charging chip is to boost the voltage before charging, and it also incorporates basic lithium battery charging management functions such as trickle charging, CC charging, and CV charging. It is then connected to the main control MCU to indicate the charging status.

[0095] In this embodiment, the main function of the 5V power supply module and its internal voltage conversion chip U3 is voltage conversion. It connects the 5V of the USB interface and the VBAT power supply of the battery pack in parallel to provide a stable 5V power supply for the main control MCU, ensuring that the main control MCU can work normally when the lithium battery pack voltage is too low.

[0096] In this embodiment, one button and one dual-color LED (LED1) are used to realize human-computer interaction.

[0097] In this embodiment, the voltage divider of R1 and R2 is acquired through the AD input port of the main control MCU to read the real-time voltage of the battery pack. When the cell voltage is too low, the user is prohibited from using the battery, and an LED is used to indicate and prompt the user to charge the battery.

[0098] In this embodiment, the main function of the main control MCU is to control the overall logic, perform signal acquisition, and control corresponding outputs. It has a built-in PGA function, which calculates the real-time pump current by acquiring the voltage across resistor RS1. Then, based on the current control requirements, it uses PWM output (signal MOT PWM) to drive transistors Q3, Q1, Q4, and MOSFET Q2 in stages, ultimately achieving the following functions:

[0099] (1) When starting the pump, gradually increase the duty cycle to achieve a soft start and avoid excessive starting current;

[0100] (2) Set a maximum current limit to avoid damage to the MOS or pump from the large current when the pump stalls;

[0101] (3) The pump's operating current is detected in real time by acquiring AD signals (SRP and SRN), and the pump's flow rate is controlled by PWM control of the operating current. When the pump is unloaded, the pump current is large, and the current is controlled to the required current by reducing the duty cycle; when the pump is under load, the duty cycle is adjusted to stabilize the current to the required value, thereby achieving stable flow rate control.

[0102] (4) The main control MCU program can be programmed through the J2 programming port.

Claims

1. A gas pump control circuit, characterized in that, It includes a main control MCU and a battery connected to the air pump. The battery is connected to a charging module and a discharging module. The charging module is connected to a charging interface. The main control MCU is connected to a power module, which is connected to the battery. The main control MCU is also connected to a button signal acquisition device and a total pressure signal acquisition device.

2. The air pump control circuit according to claim 1, characterized in that, The charging module includes a charging management module. An inductor L is provided and connected between the charging interface and the charging management module. The charging management module has a built-in charging management chip U1.

3. The air pump control circuit according to claim 2, characterized in that, The power module is also connected to a charging interface and an inductor L. The power module includes a voltage conversion chip U3. Several parallel capacitors are provided between the output terminal and the ground terminal or between the input terminal and the ground terminal of the voltage conversion chip U3.

4. A pump control circuit according to claim 1, 2, or 3, characterized in that, The discharge module is connected to the main control MCU. The discharge module includes several transistors connected in stages and a MOS transistor Q2 connected to the emitter of the last transistor.

5. A pneumatic pump control circuit according to claim 1 or 2, characterized in that, One end of the air pump is the VBAT terminal, which is connected to the battery. The other end of the air pump is connected to the MOS transistor Q. The gate of the MOS transistor Q is connected to the main control MCU. The source resistor of the MOS transistor Q is RS1.

6. The air pump control circuit according to claim 4, characterized in that, The first and second pins of the main control MCU are connected to the sampling terminal of the discharge module, and the PWM control pin of the main control MCU is connected to the control terminal of the discharge module.

7. The air pump control circuit according to claim 3, characterized in that, The nineteenth pin of the main control MCU is connected to the resistor R7 of the charging module, and the other end of the resistor R7 is connected to the charging management chip U1; the eighteenth pin of the main control MCU is connected to the resistor R1 of the charging module, and the other end of the resistor R1 is connected to the charging interface.

8. A pneumatic pump control circuit according to claim 1 or 2, characterized in that, The button signal acquisition device includes a capacitor C12. One end of the capacitor C12 is connected to the main control MCU and a resistor R12, and the other end of the capacitor C12 is grounded. The other end of the resistor R12 is connected to a resistor R10, and the resistor R10 is connected to the power supply.

9. The air pump control circuit according to claim 1, characterized in that, The total voltage signal acquisition device includes resistors R11 and R13 connected together. The other end of resistor R13 is connected to capacitor C11 and ground, respectively. The other end of capacitor C11 is connected to one end of resistor R13 and the main control MCU.

10. A gas pump control circuit according to claim 1, characterized in that, It also includes a dual-color LED device, which is connected to the main control MCU.

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