Water shortage protection circuit and water pump

Abstract

This application discloses a water shortage protection circuit and a water pump, including a water level detection module, a battery management module, a main control module, and a Hall effect sensor module. The water level detection module detects whether the current water level is lower than a preset water level. If so, it outputs a water shortage signal. The battery management module collects the battery temperature in real time. When the temperature exceeds a preset temperature, it outputs an over-temperature signal. When the main control module receives the water shortage signal or the over-temperature signal, it outputs a stop signal. The input terminal of the Hall effect sensor module is connected to the output terminal of the main control module, and the output terminal of the Hall effect sensor module is electrically connected to the motor. When the Hall effect sensor module receives the stop signal, it controls the motor to stop running. This application monitors the water level in real time through the water level detection module and collects the battery temperature in real time through the battery management module. When the water level is too low or the battery temperature is too high, the main control module will promptly control the motor to stop running, thereby enabling timely control of the water pump to stop running in the event of a water shortage, preventing the water pump from running dry and causing the motor to burn out.

Description

Technical Field

[0001] This utility model relates to the field of water pump technology, and in particular to a water shortage protection circuit and a water pump. Background Technology

[0002] Submersible pumps are the core equipment of aquarium systems. They drive water flow to achieve filtration and circulation, dissolved oxygenation and waste removal, and are widely used in home aquariums, commercial aquariums and other scenarios.

[0003] The operation of existing submersible pumps mainly relies on manual start-stop. When the water level in the aquarium is lower than the pump's suction port due to water changes or evaporation, if the pump is not stopped in time and continues to run dry, it can easily cause impeller cavitation and motor burnout. If there is a sudden stall failure due to fish feces entanglement or filter media blockage, the motor overcurrent will cause the temperature to rise sharply, which will cause the pump body to overheat, damage the mechanical seal, and in severe cases, even burn out the pump motor. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a water shortage protection circuit and a water pump.

[0005] To achieve the above objectives, this utility model proposes a water shortage protection circuit, comprising:

[0006] A water level detection module, the input terminal of which is electrically connected to a water level sensor, is used to detect whether the current water level is lower than a preset water level. If so, it outputs a water shortage signal.

[0007] A battery management module, the input of which is electrically connected to the battery, is used to collect the battery temperature in real time and output an over-temperature signal when the temperature exceeds a preset temperature.

[0008] The main control module has its enable terminal connected to the output terminal of the battery management module and its input terminal connected to the output terminal of the water level detection module. When the main control module receives the water shortage signal or the over-temperature signal, it outputs a stop operation signal.

[0009] The Hall module has its input terminal connected to the output terminal of the main control module and its output terminal electrically connected to the motor. When the Hall module receives the stop signal, it controls the motor to stop running.

[0010] By adopting the above technical solution, the water level detection module monitors the water level in real time, and the battery management module collects the battery temperature in real time. When the water level is too low or the battery temperature is too high, the main control module will promptly control the motor to stop running. This ensures that the water pump can be stopped in time when there is a water shortage, preventing the water pump from running dry and causing the motor to burn out. At the same time, if the water pump stalls during operation, causing the motor to overcurrent and the battery temperature to become too high, exceeding the preset temperature, the main control module will also promptly control the motor to stop working, preventing the water pump from being damaged due to prolonged stalling.

[0011] As described above, in a water shortage protection circuit, the water level detection module includes a capacitive sensor PA1 and a resistor R4. The positive terminal of the capacitive sensor PA1 is connected to one end of the resistor R4, and the other end of the resistor R4 is connected to the input terminal of the main control module.

[0012] As described above, in a water shortage protection circuit, the battery management module includes:

[0013] A data acquisition unit, the input terminal of which is electrically connected to the battery, is used to acquire the battery temperature in real time;

[0014] The management unit has its input terminal connected to the output terminal of the acquisition unit and its output terminal connected to the enable terminal of the main control module. The management unit is used to output an over-temperature signal when the battery temperature exceeds a preset temperature.

[0015] As described above, in a water shortage protection circuit, the acquisition unit includes a resistor R13 and a pull-up resistor R14. The temperature sensing line of the battery is connected to one end of the resistor R13, and the other end of the resistor R13 is connected to the pull-up resistor R14. The other end of the resistor R13 is also connected to the input terminal of the management unit.

[0016] The water shortage protection circuit described above also includes:

[0017] The power selection module has a first power input terminal electrically connected to the battery, a second power input terminal electrically connected to the power adapter, and an output terminal that outputs a 5V+ DC voltage. The power selection module is used to select between battery power and power adapter power.

[0018] As described above, in a water shortage protection circuit, the power supply selection module includes a diode D1, a switching transistor Q2, a resistor R10, and a resistor R11. The power supply terminal of the power adapter is connected to the positive terminal of the diode D1, and the negative terminal of the diode D1 outputs a 5V+ DC voltage. The power supply terminal of the power adapter is also connected to one end of the resistor R11, and the other end of the resistor R11 is connected to one end of the resistor R10. The other end of the resistor R10 is grounded, and the other end of the resistor R11 is also connected to the controlled terminal of the switching transistor Q2. The first conducting terminal of the switching transistor Q2 is connected to the power supply terminal of the battery, and the second conducting terminal of the switching transistor Q2 outputs a 5V+ DC voltage.

[0019] As described above, in a water shortage protection circuit, the Hall module includes a Hall motor driver chip U1, a switching transistor Q1, and a resistor R3. The output terminal of the main control module is connected to one end of the resistor R3, and the other end of the resistor R3 is connected to the controlled terminal of the switching transistor Q1. The first conducting terminal of the switching transistor Q1 is grounded, and the second conducting terminal of the switching transistor Q1 is connected to the ground terminal of the Hall motor driver chip U1. The power supply terminal of the Hall motor driver chip U1 is connected to the output terminal of the power supply selection module, and the driving terminal of the Hall motor driver chip U1 is electrically connected to the motor.

[0020] To achieve the above objectives, this utility model also provides a water pump, which includes a pump body, an inlet, and an outlet connected to the inlet on the side of the pump body. The pump body is characterized by having a drive assembly for driving the pump, a circuit board for controlling the start and stop of the drive assembly, and a battery for powering the circuit board. The circuit board is electrically connected to a water level sensor for detecting water levels, and the circuit board is engraved with the water shortage protection circuit described above.

[0021] In the water shortage protection circuit and water pump described above, the battery is electrically connected to a charging device for providing power to it, the charging device including a power connection cable and a power adapter.

[0022] As described above, in a water shortage protection circuit and water pump, the drive assembly includes a rotor and a motor for driving the rotor to rotate.

[0023] Compared with the prior art, the water shortage protection circuit and water pump proposed in this utility model have the following beneficial effects:

[0024] 1. The water shortage protection circuit proposed in this utility model monitors the water level in real time through the water level detection module and collects the battery temperature in real time through the battery management module. When the water level is too low or the battery temperature is too high, the main control module will control the motor to stop running in time, so as to control the water pump to stop running in time when water shortage occurs, avoiding the water pump running dry and causing the motor to burn out. At the same time, if the water pump stalls during operation, causing the motor to overcurrent and the battery temperature to be too high, exceeding the preset temperature, the main control module will also control the motor to stop working in time, to prevent the water pump from being damaged due to prolonged stalling.

[0025] 2. The water pump proposed in this utility model is equipped with a circuit board, on which a water shortage protection circuit is engraved. This allows the water pump to be stopped in time when it stalls, causing the motor to overcurrent and the battery temperature to become too high, or when the water level is too low. This prevents the water pump from continuing to work when there is a water shortage, which could damage the equipment. At the same time, it can also stop the water pump in time when a stall occurs, preventing the motor from burning out due to prolonged stalling. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0027] Figure 1 This is a block diagram illustrating the circuit principle structure of this utility model;

[0028] Figure 2 This is a circuit schematic diagram of the battery management module of this utility model;

[0029] Figure 3 This is a circuit schematic diagram of the main control module of this utility model;

[0030] Figure 4 This is a schematic diagram of the Hall module of this utility model.

[0031] Figure 5 This is a circuit diagram of the power supply selection module of this utility model;

[0032] Figure 6 This is a three-dimensional structural diagram of the water pump of this utility model;

[0033] Figure 7 This is another three-dimensional structural diagram of the water pump of this utility model;

[0034] Figure 8 This is an exploded view of the water pump of this utility model;

[0035] Figure 9 This is a schematic diagram of the protective cover structure of this utility model;

[0036] Figure 10 This is an exploded view of the grille cover of this utility model. Detailed Implementation

[0037] To make the technical problems solved, technical solutions, and beneficial effects 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 merely illustrative of the present utility model and are not intended to limit the present utility model.

[0038] Please refer to Figures 1 to 5 As shown in the embodiment of this specification, a water shortage protection circuit is proposed, including a water level detection module 100, a battery management module 200, a main control module 300, and a Hall module 400. The input terminal of the water level detection module 100 is electrically connected to a water level sensor 22. The water level detection module 100 is used to detect whether the current water level is lower than a preset water level. If so, it outputs a water shortage signal. The input terminal of the battery management module 200 is electrically connected to a battery 21. The battery management module 200 is used to collect the temperature of the battery 21 in real time. When the temperature exceeds a preset temperature, it outputs an over-temperature signal. The main control module 300's enable terminal is connected to the output terminal of the battery management module 200, and the main control module 300's input terminal is connected to the output terminal of the water level detection module 100. When the main control module 300 receives the water shortage signal or the over-temperature signal, it outputs a stop-run signal. The Hall module 400's input terminal is connected to the output terminal of the main control module 300, and the Hall module 400's output terminal is electrically connected to the motor 12. When the Hall module 400 receives the stop-run signal, it controls the motor to stop running.

[0039] The battery 21 is preferably a lithium battery, and the water level sensor 22 is preferably a capacitive water level sensor.

[0040] In this embodiment, the water level detection module monitors the water level in real time, and the battery management module collects the battery temperature in real time. When the water level is too low or the battery temperature is too high, the main control module will promptly control the motor to stop running. This ensures that the water pump can be stopped in time when there is a water shortage, preventing the water pump from running dry and causing the motor to burn out. At the same time, if the water pump stalls during operation, causing the motor to overcurrent and the battery temperature to become too high, exceeding the preset temperature, the main control module will also promptly control the motor to stop working, preventing the water pump from being damaged due to prolonged stalling.

[0041] Furthermore, as a preferred embodiment of this solution and not a limitation, the water level detection module 100 includes a capacitive sensor PA1 and a resistor R4. The positive terminal of the capacitive sensor PA1 is connected to one end of the resistor R4, and the other end of the resistor R4 is connected to the input terminal (i.e., pin 5) of the main control module 300.

[0042] Specifically, the capacitance value of the capacitive sensor PA1 changes with the water level, which can be determined using the capacitance formula.

[0043] in, Here, A is the dielectric constant, d is the electrode area, and d is the electrode spacing. Since the electrode area A and electrode spacing d of the capacitive sensor PA1 are fixed, as the water level drops, the water (which acts as the dielectric material) gradually moves away from the detection area of ​​the capacitive sensor PA1, causing the dielectric constant to change. As the water level decreases, the capacitance value of the capacitive sensor PA1 will gradually decrease, thereby increasing the voltage across the capacitive sensor PA1. When the water level continues to drop below the preset water level, the output voltage of the capacitive sensor PA1 is transmitted to the input terminal (pin 5) of the main control module 300 through resistor R4. That is, at this time, the input terminal (pin 5) of the main control module 300 receives the water shortage signal output by the capacitive sensor PA1.

[0044] In this embodiment, since the capacitive sensor PA1 is highly sensitive to changes in water level, it can quickly detect changes in water level. Therefore, when the water level is too low, it can transmit a water shortage signal to the main control module in a timely and accurate manner, ensuring the sensitivity and reliability of the water shortage protection circuit. Secondly, the capacitive sensor PA1 performs non-contact measurement of water level. Since it does not need to be directly immersed in water, but detects the water level by detecting the effect of water on the electric field, it will not cause water pollution. At the same time, it can also avoid problems such as corrosion or wear caused by direct contact between the sensor and the liquid, ensuring the reliability and stability of water level detection.

[0045] Furthermore, as a preferred embodiment of this solution and not a limitation, the battery management module 200 includes a data acquisition unit 210 and a management unit 220. The input terminal of the data acquisition unit 210 is electrically connected to the battery 21, and the data acquisition unit 210 is used to acquire the temperature of the battery 21 in real time. The input terminal of the management unit 220 is connected to the output terminal of the data acquisition unit 210, and the output terminal of the management unit 220 is connected to the enable terminal of the main control module 300. The management unit 220 is used to output an over-temperature signal when the battery temperature exceeds a preset temperature.

[0046] In a preferred embodiment, the acquisition unit 210 includes a resistor R13 and a pull-up resistor R14. The temperature sensing line end (i.e., the TEM end) of the battery 21 is connected to one end of the resistor R13, the other end of the resistor R13 is connected to the pull-up resistor R14, and the other end of the resistor R13 is also connected to the input end (i.e., pin 1) of the management unit 220.

[0047] In a preferred embodiment, the management unit 220 includes a battery management chip U3, the output terminal of the acquisition unit 210 is connected to the input terminal (i.e., pin 1) of the battery management chip U3, and the output terminal (i.e., pin 8) of the battery management chip U3 is connected to the enable terminal (i.e., CE terminal) of the main control module 300.

[0048] The preferred model of the battery management chip U3 is TC4056A.

[0049] Specifically, the temperature sensing line terminal (TEM terminal) of battery 21 reflects the temperature of battery 21 in the form of a voltage signal. The voltage divider circuit formed by resistor R13 and pull-up resistor R14 divides the voltage signal output from the temperature sensing line terminal (TEM terminal) of battery 21 and transmits it to the input terminal (pin 1) of battery management chip U3. Battery management chip U3 analyzes and processes the received voltage signal and converts it into a battery temperature value. If battery management chip U3 detects that the current battery temperature value of battery 21 exceeds the preset temperature, it determines that the current battery 21 is in an over-temperature state and outputs an over-temperature signal to the enable terminal (CE terminal) of main control module 300.

[0050] In this embodiment, the voltage divider circuit composed of resistor R13 and pull-up resistor R14 can stably transmit the voltage signal from the battery temperature sensing line to the battery management chip U3, thereby realizing real-time monitoring of battery temperature, avoiding overcharging and discharging of the battery under overheating conditions, and extending the battery's service life.

[0051] Furthermore, as a preferred embodiment of this solution and not a limitation, the main control module 300 includes a main control chip U2, which can be implemented using a main controller, such as an MCU (Micro controller Unit), a DSP (Digital Signal Processor), an FPGA (Field Programmable Gate Array), or a SOC (System On Chip).

[0052] Furthermore, as a preferred embodiment of this solution and not a limitation, it also includes a power selection module 500. The first power input terminal of the power selection module 500 is electrically connected to the battery 21, the second power input terminal of the power selection module 500 is electrically connected to the power adapter 32, and the output terminal of the power selection module 500 outputs a 5V+ DC voltage. The power selection module 500 is used to select whether the battery 21 or the power adapter 32 provides power.

[0053] In a preferred embodiment, the power supply selection module 500 includes a diode D1, a switching transistor Q2, a resistor R10, and a resistor R11. The power supply terminal (i.e., the 5V terminal) of the power adapter 32 is connected to the positive terminal of the diode D1, and the negative terminal of the diode D1 outputs a 5V+ DC voltage. The power supply terminal (i.e., the 5V terminal) of the power adapter 32 is also connected to one end of the resistor R11, and the other end of the resistor R11 is connected to one end of the resistor R10. The other end of the resistor R10 is grounded, and the other end of the resistor R11 is also connected to the controlled terminal of the switching transistor Q2. The first conducting terminal of the switching transistor Q2 is connected to the power supply terminal (i.e., the BAT+ terminal) of the battery 21, and the second conducting terminal of the switching transistor Q2 outputs a 5V+ DC voltage.

[0054] Specifically, when the power adapter 32 is plugged in, the power supply terminal (5V terminal) of the power adapter 32 directly outputs a 5V+ DC voltage through the forward conduction characteristic of the diode D1. At the same time, the 5V DC voltage output from the power supply terminal (5V terminal) of the power adapter 32 is divided by the voltage divider circuit composed of resistors R10 and R11 and then transmitted to the controlled terminal (gate) of the switching transistor Q2. However, since the power supply terminal (i.e., BAT+ terminal) of the battery 21 applies voltage to the first conducting terminal (source) of the switching transistor Q2, the Vgs voltage of the switching transistor Q2 is approximately equal to 0, so the switching transistor Q2 is in the off state. At this time, only the power adapter 32 provides power.

[0055] When the power adapter 32 is unplugged, the power supply terminal (5V terminal) of the power adapter 32 stops outputting 5V DC voltage. At this time, diode D1 is reverse cut off, and the controlled terminal (gate) of the switching transistor Q2 receives a voltage divider voltage of 0V. Since the power supply terminal (BAT+ terminal) of the battery 21 is applied to the first conducting terminal (source) of the switching transistor Q2, the Vgs of the switching transistor Q2 is greater than 0, so the switching transistor Q2 changes from the cut-off state to the conducting state, and the voltage of the battery 21 is output as 5V+ DC voltage through the second conducting terminal of the switching transistor Q2.

[0056] In this embodiment, diode D1 and switch Q2 form an isolation protection circuit. When the power adapter is powered, switch Q2 cuts off the battery power supply line. When switched to battery power, diode D1 can prevent the battery power supply voltage from being transmitted in reverse to the adapter end, avoiding short circuit or energy waste at the adapter end, thereby avoiding current backflow or voltage conflict caused by the parallel connection of two power supplies.

[0057] Furthermore, as a preferred embodiment of this solution and not a limitation, the Hall module 400 includes a Hall motor driver chip U1, a switching transistor Q1, and a resistor R3. The output terminal (i.e., OUT terminal) of the main control module 300 is connected to one end of the resistor R3, and the other end of the resistor R3 is connected to the controlled terminal of the switching transistor Q1. The first conducting terminal of the switching transistor Q1 is grounded, and the second conducting terminal of the switching transistor Q1 is connected to the ground terminal (i.e., GND terminal) of the Hall motor driver chip U1. The power supply terminal of the Hall motor driver chip U1 is connected to the output terminal (i.e., 5V+ terminal) of the power supply selection module 500, and the driving terminal (i.e., N terminal and M terminal) of the Hall motor driver chip U1 is electrically connected to the motor.

[0058] The Hall motor drive chip U1 is preferably model GH466.

[0059] Specifically, when the input terminal (pin 5) of the main control module 300 receives a water shortage signal, or the enable terminal (CE terminal) of the main control module 300 receives an over-temperature signal, the output terminal (OUT terminal) of the main control module 300 outputs a stop operation signal (low-level signal). When the controlled terminal of the switching transistor Q1 receives the stop operation signal, since the first conducting terminal of the switching transistor Q1 is grounded, the switching transistor Q1 is in the cut-off state at this time, the Hall motor drive chip U1 stops working, and thus the motor 12 stops working, that is, the water pump stops pumping water.

[0060] When the input terminal (pin 5) of the main control module 300 does not receive a water shortage signal and the enable terminal (CE terminal) of the main control module 300 does not receive an over-temperature signal, the output terminal (OUT terminal) of the main control module 300 outputs a high-level signal. After the controlled terminal of the switching transistor Q1 receives the high-level signal, it changes from the cut-off state to the conduction state, which enables the Hall motor driver chip U1 to start working. Thus, the driving terminals (i.e., N terminal and M terminal) of the Hall motor driver chip U1 can drive the motor 12 to work normally.

[0061] In this embodiment, the Hall motor driver chip U1 integrates a high-sensitivity Hall sensor and a full-bridge drive circuit, enabling motor start-stop control without the need for external Hall elements or complex control circuits. Simultaneously, the Hall motor driver chip U1 itself has motor stall protection and overheat protection. When motor stall occurs, it can briefly stop the motor and perform detection upon restart to prevent continuous stalling and subsequent motor burnout.

[0062] Please refer to Figures 6 to 10As shown in the embodiment of this specification, a water pump is also proposed, including a pump body 1, the pump body 1 having a water inlet 2, and a water outlet 3 connected to the water inlet 1 on the side of the pump body 1. The pump body 1 has a drive assembly 10 for driving the water pump to pump water, a circuit board 20 for controlling the start and stop of the drive assembly 10, and a battery 21 for powering the circuit board 20. The circuit board 20 is electrically connected to a water level sensor 22 for detecting the water level, and the circuit board 20 is engraved with the water shortage protection circuit as described above.

[0063] The battery 21 is preferably a lithium battery, and the water level sensor 22 is preferably a capacitive water level sensor.

[0064] In this embodiment, the water pump's circuit board is engraved with the aforementioned water shortage protection circuit. This allows the water pump to be stopped in time when it stalls, causing the motor to overcurrent and the battery temperature to become too high, or when the water level is too low. This prevents the water pump from continuing to work when there is a water shortage, which could damage the equipment. At the same time, it can also stop the water pump in time when a stall occurs, preventing the motor from burning out due to prolonged stalling.

[0065] Furthermore, as a preferred embodiment of this solution and not a limitation thereof, the battery 21 is electrically connected to a charging device 30 for providing power to it, the charging device 30 including a power connection cable 31 and a power adapter 32.

[0066] The power adapter 32 is preferably a USB plug.

[0067] In this embodiment, the charging device charges the battery to continuously provide power to the water pump, enabling the water pump to work continuously. At the same time, the battery, as an energy storage element, allows the water pump to work normally even when disconnected from an external power source, thus ensuring the water pump's endurance.

[0068] In a preferred embodiment, the battery 21 is provided with a temperature sensing line terminal 211, which is electrically connected to the circuit board 20 so that the circuit board 20 can monitor the temperature status of the battery 21 in real time.

[0069] Alternatively, the temperature sensing line terminal 211 can be an NTC thermistor.

[0070] In this embodiment, the circuit board can collect the battery temperature in real time through the temperature sensing line. When the battery temperature is too high, the water pump can be stopped in time to avoid the water pump burning out if it continues to work when the temperature is too high.

[0071] Furthermore, as a preferred embodiment of this solution and not a limitation thereof, the drive assembly 10 includes a rotor 11 and a motor 12 for driving the rotor 11 to rotate.

[0072] In a preferred embodiment, a noise reduction ring 111 is fitted on the end of the rotor 11 away from the motor 12 to reduce the noise when the rotor 11 rotates.

[0073] Alternatively, the noise reduction ring 111 can be a ceramic ring.

[0074] In this embodiment, since the rotor is fitted with a ceramic ring, and the coefficient of friction of ceramic material is much lower than that of metal or plastic, the friction between the rotor and the bearing is reduced when the rotor rotates, thereby reducing the vibration noise during rotation.

[0075] Furthermore, as a preferred embodiment of this solution and not a limitation thereof, the pump body 1 is also provided with a protective cover 40 for sealing the rotor 11, and the water inlet 2 is disposed on the protective cover 40.

[0076] In a preferred embodiment, the outer side of the protective cover 40 is provided with a grid cover 41, the grid cover 41 is provided with a receiving space 42, and the receiving space 42 accommodates a sponge 43 for filtering impurities.

[0077] In this embodiment, the sponge can intercept large particles of impurities in the water (such as sand, algae, etc.), preventing impurities from entering the pump body from the inlet, thereby avoiding blockage by impurities and causing wear and damage to the rotor or motor.

[0078] Those skilled in the art should understand that the above description is one embodiment provided in conjunction with specific content, and does not imply that the specific implementation of this utility model is limited to these descriptions. Furthermore, due to differences in industry naming conventions, it is not limited to the above names or English names. Any methods or structures similar to or identical to those of this utility model, or any technical deductions or substitutions made based on the concept of this utility model, should be considered within the scope of protection of this utility model.

Claims

1. A water shortage protection circuit, characterized in that, include: A water level detection module, the input terminal of which is electrically connected to a water level sensor, is used to detect whether the current water level is lower than a preset water level. If so, it outputs a water shortage signal. A battery management module, the input of which is electrically connected to the battery, is used to collect the battery temperature in real time and output an over-temperature signal when the temperature exceeds a preset temperature. The main control module has its enable terminal connected to the output terminal of the battery management module and its input terminal connected to the output terminal of the water level detection module. When the main control module receives the water shortage signal or the over-temperature signal, it outputs a stop operation signal. The Hall module has its input terminal connected to the output terminal of the main control module and its output terminal electrically connected to the motor. When the Hall module receives the stop signal, it controls the motor to stop running.

2. The water shortage protection circuit according to claim 1, characterized in that, The water level detection module includes a capacitive sensor PA1 and a resistor R4. The positive terminal of the capacitive sensor PA1 is connected to one end of the resistor R4, and the other end of the resistor R4 is connected to the input terminal of the main control module.

3. The water shortage protection circuit according to claim 1, characterized in that, The battery management module includes: A data acquisition unit, the input terminal of which is electrically connected to the battery, is used to acquire the battery temperature in real time; The management unit has its input terminal connected to the output terminal of the acquisition unit and its output terminal connected to the enable terminal of the main control module. The management unit is used to output an over-temperature signal when the battery temperature exceeds a preset temperature.

4. A water shortage protection circuit according to claim 3, characterized in that, The acquisition unit includes a resistor R13 and a pull-up resistor R14. The temperature sensing line of the battery is connected to one end of the resistor R13, and the other end of the resistor R13 is connected to the pull-up resistor R14. The other end of the resistor R13 is also connected to the input terminal of the management unit.

5. A water shortage protection circuit according to claim 1, characterized in that, Also includes: The power selection module has a first power input terminal electrically connected to the battery, a second power input terminal electrically connected to the power adapter, and an output terminal that outputs a 5V+ DC voltage. The power selection module is used to select between battery power and power adapter power.

6. A water shortage protection circuit according to claim 5, characterized in that, The power supply selection module includes a diode D1, a switching transistor Q2, resistors R10 and R11. The power supply terminal of the power adapter is connected to the positive terminal of the diode D1, and the negative terminal of the diode D1 outputs a 5V+ DC voltage. The power supply terminal of the power adapter is also connected to one end of the resistor R11, and the other end of the resistor R11 is connected to one end of the resistor R10. The other end of the resistor R10 is grounded, and the other end of the resistor R11 is also connected to the controlled terminal of the switching transistor Q2. The first conducting terminal of the switching transistor Q2 is connected to the power supply terminal of the battery, and the second conducting terminal of the switching transistor Q2 outputs a 5V+ DC voltage.

7. A water shortage protection circuit according to claim 5, characterized in that, The Hall module includes a Hall motor driver chip U1, a switching transistor Q1, and a resistor R3. The output terminal of the main control module is connected to one end of the resistor R3, and the other end of the resistor R3 is connected to the controlled terminal of the switching transistor Q1. The first conducting terminal of the switching transistor Q1 is grounded, and the second conducting terminal of the switching transistor Q1 is connected to the ground terminal of the Hall motor driver chip U1. The power supply terminal of the Hall motor driver chip U1 is connected to the output terminal of the power supply selection module, and the driving terminal of the Hall motor driver chip U1 is electrically connected to the motor.

8. A water pump, comprising a pump body, wherein the pump body is provided with an inlet, and an outlet communicating with the inlet is provided on the side of the pump body, characterized in that, The pump body is provided with a drive assembly for driving the water pump to pump water, a circuit board for controlling the start and stop of the drive assembly, and a battery for powering the circuit board. The circuit board is electrically connected to a water level sensor for detecting the water level, and the circuit board is engraved with a water shortage protection circuit as described in any one of claims 1-7.

9. A water pump according to claim 8, characterized in that, The battery is electrically connected to a charging device for providing it with electrical energy, the charging device including a power connection cable and a power adapter.

10. A water pump according to claim 8, characterized in that, The drive assembly includes a rotor and a motor for driving the rotor to rotate.

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