Water pump control system

Abstract

The utility model relates to a water pump control system, which solves the problems in the prior art and adopts the technical scheme that the water pump control system comprises a water pump controller and a control panel module in signal connection with the water pump controller, and the control panel module comprises a data processor, a display module in signal connection with the data processor and a key module. The water pump controller receives control signals of the host and / or the data processor and is used for controlling the water pump to work, the data processor is an MCU processor, the MCU processor is in signal connection with a temperature sensor and / or a pressure sensor arranged on the water pump, and the MCU processor receives and analyzes temperature and / or pressure data and is used for enabling the water pump controller to control the water pump to work. The system has the advantages that the system is applied to a water pump, and the water pump is controlled to work intelligently by intelligently analyzing water temperature, water pressure and other data in the water pump through a water pump control system; by improving the display module and the key module, related personnel can conveniently and visually know the working condition of the water pump or modify the working parameters of the water pump, and the water pump runs more smoothly and efficiently.

Description

TECHNICAL FIELD

[0001] The utility model relates to water pump field especially relates to a water pump control system. BACKGROUND

[0002] For the traditional water pump, especially in the industrial environment, the requirement of water pump, often mainly pay attention to water pump performance (such as energy consumption, efficiency etc.). With time elapses, higher requirements are put forward to water pump function, and the water pump is driven by the motor on it to work, and the water pump function is controlled by the motor. That is, more functional requirements need to be added on the original electric energy conversion function of the motor, especially, such as the intelligent control function of the motor, so that the host computer can realize interactive communication between the motors, and the water pump is more intelligent, for this, the technical scheme of the utility model is developed. SUMMARY

[0003] The utility model discloses a water pump control system, applied to water pump, be used for improving man-machine interaction function, through the intelligent analysis of water pump control system water temperature, water pressure etc. Data in water pump control water pump intelligent work, at the same time, through display module, relevant personnel is convenient to understand water pump working condition directly, through the setting of button module, modify water pump working parameter, make water pump more smoothly more efficient operation.

[0004] The utility model discloses a water pump control system, applied to water pump, be used for improving man-machine interaction function, through the intelligent analysis of water pump control system water temperature, water pressure etc. Data in water pump control water pump intelligent work, at the same time, through display module, relevant personnel is convenient to understand water pump working condition directly, through the setting of button module, modify water pump working parameter, make water pump more smoothly more efficient operation.

[0005] As further improvement and supplement of the above technical scheme, the utility model discloses the following technical measures: the PWM receiving circuit and PWM feedback circuit are equipped in the water pump controller, the PWM receiving circuit is used to receive the PWM wave that host computer sends out, the PWM feedback circuit is used to feed back the PWM wave to the host computer, the PWM feedback circuit is equipped with photocoupler drive circuit, and the photocoupler PC3 that is in series with the photocoupler drive circuit.Through the PWM receiving circuit, the water pump controller receives the PWM wave that host computer sends out, and according to the frequency or duty ratio of PWM wave, the rotating speed of motor on the water pump is controlled, at the same time, through the PWM feedback circuit, the water pump operating condition can be fed back to the sending host computer through the feedback waveform, and the rotating speed, power or fault information etc.are fed back.Photocoupler PC3 in the PWM feedback circuit realizes electrical isolation through optical signal.

[0006] As preferred, the photocoupler drive circuit includes resistance R34, resistance R35, resistance R36, resistance R37 and triode Q5, the resistance R35 is arranged between the base and the emitter of the triode Q5, the resistance R34 is connected with the base of the triode Q5, the resistance R36 is connected with the collector of the triode Q5, the resistance R37 is connected with the photocoupler PC3, and the other end of the resistance R34 is the output end of the PWM feedback circuit.

[0007] As preferred, the PWM receiving circuit includes connector CN3, triode group Q6, resistance R38, resistance R39, resistance R39 and photocoupler PC4, the pin 1 on the connector CN3 is connected with the resistance R37, the pin 2 and pin 3 on the connector CN3 are connected with the resistance R40, the triode group Q6, resistance R39, photocoupler PC4, resistance R38 form connection, and the other end of the resistance R38 is the input end of the PWM receiving circuit.

[0008] As preferred, the pin 2 and pin 3 on the connector CN3 are connected with the resistance R40 through the protection circuit, and the protection circuit includes parallel capacitor C21 and TVS tube D3, which is advantageous to protect the device from voltage peak damage.

[0009] As preferred, the MCU processor is connected with a temperature sensor connection circuit, the temperature sensor connection circuit comprises a connector CN4, a decoupling capacitor C22, a decoupling capacitor C23, a voltage dividing resistor R41, a first low-pass filter and a diode group D4, a pin 1 and a pin 2 of the connector CN4 are connected with the parallel connection of the decoupling capacitor C22 and the decoupling capacitor C23, the voltage dividing resistor R41 is connected in parallel with the parallel connection of the decoupling capacitor C22 and the decoupling capacitor C23, the first low-pass filter comprises a resistor R42 and a capacitor C24 connected in parallel with the voltage dividing resistor R41, the diode group D4 is a two-in-one diode, the diode group D4 is connected in parallel with the first low-pass filter, and the first low-pass filter is connected with the MCU processor. The diode group D4 is a two-in-one diode (i.e. two diodes are included thereon, which is referred to as a diode in practical application, such as a diode of model BAT54S), which plays a clamping role to prevent abnormal voltage from damaging the MCU.

[0010] As preferred, the MCU processor is connected with a pressure sensor connection circuit, the pressure sensor connection circuit comprises a connector CN5, a sampling resistor R43, a sampling resistor R44, a second low-pass filter, a voltage follower U4, a decoupling capacitor C26 and a third low-pass filter, a pin 2 and a pin 3 of the connector CN4 are connected with the parallel connection of the sampling resistor R43 and the sampling resistor R44, the second low-pass filter comprises a resistor R45 and a capacitor C25 connected in parallel, the second low-pass filter is connected with the parallel connection of the sampling resistor R43 and the sampling resistor R44, the third low-pass filter comprises a resistor R46 and a capacitor C27 connected in parallel, the voltage follower U4 is connected with the second low-pass filter, the third low-pass filter and the decoupling capacitor C26, and the third low-pass filter is connected with the MCU processor. Through the characteristics of the voltage follower U4, it is beneficial to reduce interference and noise and ensure the integrity of the signal.

[0011] As preferred, a low-voltage isolation circuit is arranged on the control panel module, the low-voltage isolation circuit comprises a connector CN2, an RX signal isolation circuit connected with a pin 4 of the connector CN2 and a TX signal isolation circuit connected with a pin 3 of the connector CN2, the RX signal isolation circuit comprises a first driving circuit, a second driving circuit and an optical coupler PC1 arranged between the first driving circuit and the second driving circuit, the TX signal isolation circuit comprises a third driving circuit, a fourth driving circuit and an optical coupler PC2 arranged between the third driving circuit and the fourth driving circuit, and the connector CN2 is connected with the MCU processor.

[0012] As preferred, the display module is provided with an LED driving circuit, which comprises an LED driving chip U2, filter capacitors C9, C10, C11, decoupling capacitors C1, C12, C13, C14, pull-up resistors R18, R19, R30, the filter capacitor C9 and the pull-up resistor R18 are connected with pin 2 on the LED driving chip U2 and the serial port DIO on the MCU processor, the filter capacitor C10 and the pull-up resistor R19 are connected with pin 3 on the LED driving chip U2 and the serial port CLK on the MCU processor, the filter capacitor C200 and the pull-up resistor R19 are connected with pin 4 on the LED driving chip U2 and the serial port STB on the MCU processor, the decoupling capacitors C12 and C13 are connected in parallel and connected with pin 7 on the LED driving chip U2, the decoupling capacitors C14 and C1 are connected in parallel and connected with pin 21 and pin 22 on the LED driving chip U2.

[0013] As preferred, the key module comprises several keys, LED indicator lamps arranged in each key, and key indication circuit for controlling the operation of the LED indicator lamps, the keys are touch keys KEY1, KEY2, KEY3, the key indication circuit comprises an LED driving chip U3 and a reset circuit in the MCU processor, the touch keys KEY1, KEY2, KEY3 are connected with pin 7, pin 8, pin 9 on the LED driving chip U3 through matching resistors R31, R32, R33 respectively, the reset circuit comprises a resistor R34 and a capacitor C18 connected in parallel, pin 23 on the LED driving chip U3 is connected with the reset circuit, and pin 1 on the LED driving chip U3 is connected with decoupling capacitors C15 and C16 connected in parallel.

[0014] The utility model discloses a beneficial effect that 1, water pump control system is applied to water pump, and the water temperature, water pressure and other data in the water pump are intelligently analyzed through water pump control system to control the intelligent work of water pump, and through the improvement display module, button module, the relevant personnel is convenient to intuitively understand the water pump working condition or modify water pump working parameter, makes the water pump more smoothly more efficient operation. 2, through PWM receiving circuit, the PWM wave that water pump controller receives host sends, according to the frequency or duty cycle of PWM wave, to control the rotating speed of motor on water pump, simultaneously, through PWM feedback circuit, can give sending host through feedback wave form, feedback speed, power or failure and so on information of water pump operation. The optocoupler PC3 in PWM feedback circuit realizes electrical isolation through optical signal. 3, in the display module, setting at least 33 LED, can use LED to constitute number, show speed, power or failure code and so on, can intuitively show the running state of water pump. Meanwhile, adopt LED drive chip to save MCU processor resource, and provide the possibility for subsequent increase LED number (such as can drive 56 LED), facilitate subsequent function extension. 4, through the information of MCU processor receiving button module and handle not only realize the function of touch button, but also show through LED pilot lamp, even in dim condition, can quickly and accurately find the key position, greatly enhance the man-machine interaction experience, solve the inconvenient operation problem of the key position difficult to find in prior art. 5, in order to control safety, set up low voltage isolation circuit. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a structural schematic view of the utility model relates to water pump control system.

[0016] Figure 2 It is a schematic diagram of the PWM receiving circuit and PWM feedback circuit related to the utility model.

[0017] Figure 3 It is a schematic diagram of the temperature sensor connection circuit related to the utility model.

[0018] Figure 4 It is a schematic diagram of the pressure sensor connection circuit related to the utility model.

[0019] Figure 5 It is a schematic diagram of the low voltage isolation circuit related to the utility model.

[0020] Figure 6 It is a schematic diagram of the LED pilot lamp in the display module related to the utility model.

[0021] Figure 7 It is a schematic diagram of the LED drive circuit related to the utility model.

[0022] Figure 8The utility model relates to a circuit schematic for driving LED indicating lamp work in light touch button. DETAILED DESCRIPTION

[0023] The technical scheme of the utility model will be further specifically explained below by examples in combination with drawings.

[0024] Embodiment: as Figure 1 The water pump control system is applied to a water pump, and is used for improving human-computer interaction function between the water pump and the water pump control system.

[0025] In the technical scheme, the water pump control system is applied to a water pump, and is used for improving human-computer interaction function between the water pump and the water pump control system.

[0026] In the technical scheme, the host computer is generally arranged in a machine room or a space around the water pump, and can be independent of the water pump. The host computer and the water pump control system communicate through a 485 communication circuit and a PWM communication circuit, the host computer sends a signal, and the water pump control system makes a corresponding action, and also sends a feedback signal to the host computer. The 485 communication is used for long-distance communication, and the PWM communication is used for short-distance communication. The water pump controller and the control panel module communicate through a UART communication circuit. The MCU processor is used for processing data, operation or display corresponding data, can judge the current running environment of the water pump, and automatically adjusts the rotating speed through the host computer or the key module to realize intelligent frequency conversion.

[0027] In actual application, the water pump controller is provided with a PWM receiving circuit and a PWM feedback circuit. The PWM receiving circuit is used for receiving the PWM wave sent by the host computer. The PWM feedback circuit is used for feeding back the PWM wave to the host computer. The PWM feedback circuit is provided with an opto-coupler driving circuit, and an opto-coupler PC3 is connected in series with the opto-coupler driving circuit.

[0028] In the technical solution, the PWM receiving circuit receives the PWM wave sent by the host computer, and controls the rotating speed of the motor on the water pump according to the frequency or duty cycle of the PWM wave, and meanwhile, the PWM feedback circuit can feed back the running condition of the water pump to the host computer through the feedback wave, and feed back the rotating speed, power or fault information, etc. The optocoupler PC3 in the PWM feedback circuit realizes the electrical isolation through the optical signal.

[0029] As shown in Figure 2 In actual application, the optocoupler driving circuit includes resistors R34, R35, R36, R37 and a triode Q5, the resistor R35 is arranged between the base and the emitter of the triode Q5, the resistor R34 is connected with the base of the triode Q5, the resistor R36 is connected with the collector of the triode Q5, the optocoupler PC3 is connected with the resistor R37 in series, and the other end of the resistor R34 is the output end of the PWM feedback circuit.

[0030] In the technical solution, the host computer needs to add a pull resistor on the line of the pin 1 of the connector CN3 in the PWM feedback circuit.

[0031] In the technical solution, when the PWM_OUT signal is high, the triode Q5 is turned off, the light emitting device of the optocoupler PC3 does not work, and the circuit of the pin 1 of the connector CN3 is floating, and the host computer receives the high level due to the existence of the pull-up resistor. Similarly, when the PWM_OUT signal is low, the triode Q5 is turned on, and the host computer receives the low level. The isolation communication of the PWM wave is realized through the circuit, which ensures the safety of the circuit and the PWM wave is not disturbed.

[0032] As shown in Figure 2 In actual application, the PWM receiving circuit includes a connector CN3, a triode group Q6, resistors R38, R39, R39 and an optocoupler PC4, the pin 1 of the connector CN3 is connected with the resistor R37, the pin 2 and the pin 3 of the connector CN3 are connected with the resistor R40, the triode group Q6, the resistor R39, the optocoupler PC4, the resistor R38 are connected, and the other end of the resistor R38 is the input end of the PWM receiving circuit.

[0033] In the technical solution, in the PWM receiving circuit, the optocoupler PC4 (such as 6N137S (TA)) realizes electrical isolation through optical signals. The connector CN3 is used for connecting communication lines, wherein a pin 1 of the connector CN3 is used for feeding back signals, a pin 2 is used for isolation, and a pin 3 is used for input signals. The triode group Q6 (in the industry, it is also commonly called a triode) is a two-in-one triode (that is, it is composed of two triodes, such as a triode of MMDT3904 type), and the triode group Q6 is turned on as long as the high level of the input signal of the pin 3 of the connector CN3 is greater than 1.4V by using the characteristic that the base-emitter voltage of the triode is 0.7V. At this time, the current of the light-emitting device in the optocoupler PC4 is equal to the current on the resistor R39, that is, the current value in the optocoupler PC4 is related to the resistor R39, which is 0.7 / R39, so that the circuit has a wider voltage range.

[0034] In actual application, a protection circuit is arranged between the pin 2 and the pin 3 of the connector CN3 and the resistor R40, the protection circuit includes the capacitor C21 and the TVS tube D3 connected in parallel, and is used for protecting the device from being damaged by voltage spikes.

[0035] As shown in the figure, Figure 3 In actual application, the MCU processor is connected with a temperature sensor connection circuit, the temperature sensor connection circuit includes a connector CN4, a decoupling capacitor C22, a decoupling capacitor C23, a voltage dividing resistor R41, a first low-pass filter and a diode group D4, a pin 1 and a pin 2 of the connector CN4 are connected with the decoupling capacitor C22 and the decoupling capacitor C23 connected in parallel, the voltage dividing resistor R41 is connected with the decoupling capacitor C22 and the decoupling capacitor C23 connected in parallel, the first low-pass filter includes a resistor R42 and a capacitor C24 connected with the voltage dividing resistor R41 in parallel, the diode group D4 is a two-in-one diode, the diode group D4 is connected with the first low-pass filter in parallel, and the first low-pass filter is connected with the MCU processor.

[0036] In the technical solution, a thermistor is generally placed in a metal probe for measuring temperature on the temperature sensor of the water pump, and the temperature is calculated through the change of the resistance. Generally, according to the recommendation of the specification book, a suitable pull-up resistor or pull-down resistor is selected. The connector CN4 has a temperature sensor interface, the voltage signal after voltage division is sent to the MCU processor through the first low-pass filter composed of the resistor R42 and the capacitor C24 by the voltage dividing resistor R41, and the temperature of the measurement point can be calculated. The diode group D4 is a two-in-one diode (that is, it includes two diodes, which is referred to as a diode in actual application, such as a diode of BAT54S type), which plays a clamping role and prevents the MCU from being damaged by abnormal voltage.

[0037] As shown in the figure, Figure 4As shown in the actual application, the MCU processor is connected with a pressure sensor connection circuit, the pressure sensor connection circuit comprises a connector CN5, a sampling resistor R43, a sampling resistor R44, a second low-pass filter, a voltage follower U4, a decoupling capacitor C26 and a third low-pass filter, pins 2 and 3 of the connector CN4 are connected with the sampling resistor R43 and the sampling resistor R44 in parallel, the second low-pass filter comprises a resistor R45 and a capacitor C25 in parallel, the second low-pass filter is connected with the sampling resistor R43 and the sampling resistor R44 in parallel, the third low-pass filter comprises a resistor R46 and a capacitor C27, the voltage follower U4 is connected with the second low-pass filter, the third low-pass filter and the decoupling capacitor C26, and the third low-pass filter is connected with the MCU processor.

[0038] In the technical solution, the pressure sensor on the water pump commonly used is a voltage type pressure sensor and a current type pressure sensor. The voltage type pressure sensor is connected in a mode similar to the temperature sensor, and the voltage is calculated by dividing the voltage through an upper pull resistor or a lower pull resistor. The current type pressure sensor connection circuit is as shown in the figure. Figure 4 As shown in the figure, the current is converted into a voltage signal through the sampling resistor R43 and the sampling resistor R44, and then the voltage signal is connected to the voltage follower U4 through the second low-pass filter composed of the resistor R45 and the capacitor C25. By using the characteristics of the voltage follower, interference and noise are reduced, and the integrity of the signal is ensured. Finally, the signal is sent to the MCU processor for signal processing through the third low-pass filter composed of the resistor R46 and the capacitor C27.

[0039] As shown in the figure, Figure 5 As shown in the actual application, a low-voltage isolation circuit is arranged on the control panel module, the low-voltage isolation circuit comprises a connector CN2, an RX signal isolation circuit connected with a pin 4 of the connector CN2 and a TX signal isolation circuit connected with a pin 3 of the connector CN2, the RX signal isolation circuit comprises a first driving circuit, a second driving circuit and an optocoupler PC1 arranged between the first driving circuit and the second driving circuit, the TX signal isolation circuit comprises a third driving circuit, a fourth driving circuit and an optocoupler PC2 arranged between the third driving circuit and the fourth driving circuit, and the connector CN2 is connected with the MCU processor.

[0040] In the technical solution, the water pump controller and the control panel module communicate through UART. The control panel module contains a key. In view of the safety of manual operation, the optocoupler PC1 and the optocoupler PC2 are adopted, the electrical isolation is realized through optical signals, and the safe low-voltage isolation circuit is realized. The current limiting resistor R8 is used to ensure that the optocoupler C5 works in a normal current range.

[0041] In the technical solution, taking signal isolation of RX as an example, when the pin 4 on the connector CN2 outputs high level, the triode Q2 is turned on, the pin 3 and the pin 4 of the optical coupler PC1 are turned off, at this time, the pull-down resistor R5, the resistor R6, the resistor R7 and the capacitor C4 form the first driving circuit of the triode Q1, the triode Q1 is turned off due to the resistor R5, and RX is high level due to the pull-up resistor R4. When the pin 4 of the connector CN2 outputs low level, RX is low level. The resistor R9 and the capacitor C6 form the second driving circuit of the triode Q2.

[0042] Similarly, the signal isolation of the TX signal isolation circuit is similar or the same as the principle of the signal isolation of RX. The resistor R12 and the capacitor C7 form the third driving circuit of the triode Q3. The resistor R15, the resistor R16, the resistor R17 and the capacitor C8 form the fourth driving circuit of the triode Q4.

[0043] In actual application, as shown in Figure 7 The display module is provided with an LED driving circuit, the LED driving circuit comprises an LED driving chip U2, filter capacitors C9, C10 and C11, decoupling capacitors E1, C12, C13 and C14, and pull-up resistors R18, R19 and R30. The filter capacitor C9 and the pull-up resistor R18 are connected with a pin 2 on the LED driving chip U2 and a serial port DIO on the MCU processor. The filter capacitor C10 and the pull-up resistor R19 are connected with a pin 3 on the LED driving chip U2 and a serial port CLK on the MCU processor. The filter capacitor C200 and the pull-up resistor R19 are connected with a pin 4 on the LED driving chip U2 and a serial port STB on the MCU processor. The decoupling capacitors C12 and C13 are connected in parallel and connected with a pin 7 on the LED driving chip U2. The decoupling capacitors C14 and E1 are connected in parallel and connected with a pin 21 and a pin 22 on the LED driving chip U2.

[0044] In the technical solution, as shown in Figure 6 In the display module, 33 LED indicator lights are arranged, which can be used to form numbers, display rotating speed, power or fault codes and the like, and intuitively show the running state of the water pump. When a large number of LED indicator lights are driven, an LED driving chip can be used to save the resources of the MCU processor.

[0045] In the technical solution, the LED driving circuit composed of the decoupling capacitor E1, the decoupling capacitor C12, the decoupling capacitor C13, the decoupling capacitor C14, the pull-up resistor R18, the pull-up resistor R19, the pull-up resistor R30, and the filter capacitor C9, the filter capacitor C10 and the filter capacitor C11 can drive up to 56 LEDs, thereby greatly saving the resources of the MCU processor and providing the possibility for subsequent increase in the number of LEDs.

[0046] In actual application, as shown in the figure, Figure 8 The key module includes a plurality of keys, an LED indicator lamp arranged in each key, and a key indication circuit for controlling the operation of the LED indicator lamp. The keys are touch keys KEY1, KEY2 and KEY3. The key indication circuit includes an LED driving chip U3 and a reset circuit in the MCU processor. The touch keys KEY1, KEY2 and KEY3 are connected to pins 7, 8 and 9 of the LED driving chip U3 through matching resistors R31, R32 and R33, respectively. The reset circuit includes resistors R34 and capacitors C18 connected in parallel. Pin 23 of the LED driving chip U3 is connected to the reset circuit. Decoupling capacitors C15 and C16 are connected in parallel to pin 1 of the LED driving chip U3. In the technical solution, the MCU processor receives information from the key module and processes it to not only realize the function of the touch keys but also display the information through the LED indicator lamp. Even in dim conditions, the position of the keys can be quickly and accurately found, greatly enhancing the human-machine interaction experience and solving the problem of inconvenient operation caused by the difficulty in finding the position of the keys in the prior art.

[0047] The embodiments are only used to limit the utility model. In the above embodiments, the utility model can be variously changed and varied. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model shall be included in the protection scope of the utility model.

Claims

1. A water pump control system characterized by The application relates to a water pump control system, which comprises a water pump controller, a control panel module connected with the water pump controller, the control panel module comprising a data processor, a display module connected with the data processor and a key module, the water pump controller receiving control signals from a host computer and / or the data processor to control the water pump, the data processor being an MCU processor, the MCU processor being connected with a temperature sensor and / or a pressure sensor arranged on the water pump, the MCU processor receiving and analyzing temperature and / or pressure data to control the water pump controller to control the water pump; The water pump controller is provided with a PWM receiving circuit and a PWM feedback circuit, the PWM receiving circuit is used for receiving PWM waves sent by the host computer, and the PWM feedback circuit is used for feeding back PWM waves to the host computer, the PWM feedback circuit is provided with an optocoupler driving circuit and an optocoupler PC3 connected in series with the optocoupler driving circuit.

2. The water pump control system according to claim 1, characterized by The optocoupler driving circuit comprises a resistor R34, a resistor R35, a resistor R36, a resistor R37 and a triode Q5, the resistor R35 is arranged between the base and the emitter of the triode Q5, the resistor R34 is connected with the base of the triode Q5, the resistor R36 is connected with the collector of the triode Q5, the resistor R37 is connected in series with the optocoupler PC3, and the other end of the resistor R34 is the output end of the PWM feedback circuit.

3. The water pump control system of claim 2, wherein The PWM receiving circuit comprises a connector CN3, a triode group Q6, a resistor R38, a resistor R39, a resistor R40 and an optocoupler PC4, a pin 1 of the connector CN3 is connected with the resistor R37, a pin 2 and a pin 3 of the connector CN3 are connected with the resistor R40, the triode group Q6, the resistor R39, the optocoupler PC4, the resistor R38 are connected in series, and the other end of the resistor R38 is the input end of the PWM receiving circuit.

4. The water pump control system according to claim 3, characterized by A protection circuit is arranged between the pin 2 and the pin 3 of the connector CN3 and the resistor R40, the protection circuit comprises a capacitor C21 and a TVS tube D3 connected in parallel.

5. The water pump control system of claim 1, wherein The MCU processor is connected with a temperature sensor connection circuit, the temperature sensor connection circuit comprises a connector CN4, a decoupling capacitor C22, a decoupling capacitor C23, a voltage dividing resistor R41, a first low-pass filter and a diode group D4, a pin 1 and a pin 2 of the connector CN4 are connected with the decoupling capacitor C22 and the decoupling capacitor C23 connected in parallel, the voltage dividing resistor R41 is connected in parallel with the decoupling capacitor C22 and the decoupling capacitor C23 connected in parallel, the first low-pass filter comprises a resistor R42 and a capacitor C24 connected in parallel with the voltage dividing resistor R41, the diode group D4 is a two-in-one diode, the diode group D4 is connected in parallel with the first low-pass filter, and the first low-pass filter is connected with the MCU processor.

6. The water pump control system of claim 1, wherein The MCU processor is connected with a pressure sensor connection circuit, the pressure sensor connection circuit comprises a connector CN5, a sampling resistor R43, a sampling resistor R44, a second low-pass filter, a voltage follower U4, a decoupling capacitor C26 and a third low-pass filter, pins 2 and 3 of the connector CN4 are connected with the sampling resistor R43 and the sampling resistor R44 in parallel, the second low-pass filter comprises a resistor R45 and a capacitor C25 in parallel, the second low-pass filter is connected with the sampling resistor R43 and the sampling resistor R44 in parallel, the third low-pass filter comprises a resistor R46 and a capacitor C27, the voltage follower U4 is connected with the second low-pass filter, the third low-pass filter and the decoupling capacitor C26, and the third low-pass filter is connected with the MCU processor.

7. The water pump control system of claim 1, wherein A low-voltage isolation circuit is arranged on the control panel module, the low-voltage isolation circuit comprises a connector CN2, an RX signal isolation circuit connected with pin 4 of the connector CN2 and a TX signal isolation circuit connected with pin 3 of the connector CN2, the RX signal isolation circuit comprises a first driving circuit, a second driving circuit and an optical coupler PC1 arranged between the first driving circuit and the second driving circuit, the TX signal isolation circuit comprises a third driving circuit, a fourth driving circuit and an optical coupler PC2 arranged between the third driving circuit and the fourth driving circuit, and the connector CN2 is connected with the MCU processor.

8. The water pump control system of claim 1, wherein An LED driving circuit is arranged in the display module, the LED driving circuit comprises an LED driving chip U2, filter capacitors C9, C10 and C11, decoupling capacitors C12, C13 and C14, and pull-up resistors R18, R19 and R30, the filter capacitor C9 and the pull-up resistor R18 are connected with pin 2 of the LED driving chip U2 and a serial port DIO of the MCU processor, the filter capacitor C10 and the pull-up resistor R19 are connected with pin 3 of the LED driving chip U2 and a serial port CLK of the MCU processor, the filter capacitor C200 and the pull-up resistor R19 are connected with pin 4 of the LED driving chip U2 and a serial port STB of the MCU processor, the decoupling capacitor C12 and the decoupling capacitor C13 are connected in parallel and connected with pin 7 of the LED driving chip U2, and the decoupling capacitor C14 and the decoupling capacitor E1 are connected in parallel and connected with pins 21 and 22 of the LED driving chip U2.

9. The water pump control system of claim 1, wherein The key module includes several keys, LED indicator lamps arranged in each key, key indication circuit for controlling the operation of the LED indicator lamps, the keys are touch keys KEY1, touch keys KEY2, touch keys KEY3, the key indication circuit includes an LED driving chip U3 and a reset circuit in the MCU processor, the touch keys EY1, the touch keys KEY2 and the touch keys KEY3 are connected with pins 7, 8 and 9 on the LED driving chip U3 through matching resistors R31, R32 and R33 respectively, the reset circuit includes a resistor R34 and a capacitor C18 connected in parallel, the pin 23 on the LED driving chip U3 is connected with the reset circuit, and the pin 1 of the LED driving chip U3 is connected with a decoupling capacitor C15 and a decoupling capacitor C16 connected in parallel.

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