Water pump control circuit and water pump

Abstract

The utility model relates to the technical field of water pump control, in particular to a water pump control circuit and a water pump. The analog signal transmission module is connected with the controller and is used for being connected with an external analog signal device and converting an analog signal sent by the external analog signal device into a signal which can be identified by the controller; and the digital signal transmission module is connected with the controller and is used for being connected with an external digital signal device and bidirectionally transmitting digital communication signals between the external digital signal device and the controller.

Description

Technical Field

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

[0002] Water pumps, as a common fluid transport device, are widely used in various fields such as agricultural irrigation, building water supply, industrial production, and urban drainage.

[0003] With the rapid development of modern automation technology, the operation and control of water pumps are no longer limited to traditional manual or mechanical control, but are gradually evolving towards automation and intelligence through control circuit boards. As working conditions become more diverse and system requirements increase, integrated circuit technology and embedded control technology are increasingly being applied to water pump control. The water pump control circuit board, as the core component of the entire automatic water pump control system, undertakes key functions such as signal acquisition, data processing, and feedback control. Different customers have different requirements for the communication control methods of their products, but currently, the communication methods on control boards are mostly single, for example, only supporting analog signal communication or digital signal communication. As a water pump manufacturer, it is necessary to provide customers with water pumps that meet their specific needs. Utility Model Content

[0004] The purpose of this invention is to provide a water pump control circuit and a water pump to support users' communication needs for water pump control.

[0005] To achieve the above objectives, this utility model provides a water pump control circuit including a controller;

[0006] The analog signal transmission module, connected to the controller, is used to connect to an external analog signal device and convert the analog signals sent by the external analog signal device into signals that the controller can recognize.

[0007] The digital signal transmission module, connected to the controller, is used to connect to external digital signal devices and transmit digital communication signals bidirectionally between the external digital signal devices and the controller.

[0008] On the other hand, this utility model provides a water pump, including the water pump control circuit provided in any embodiment.

[0009] As can be seen from the above, the technical solution provided by this utility model includes an analog signal transmission module and a digital signal transmission module in the water pump control circuit, which enables the controller to transmit various external signals, improves the interface with external devices during water pump control, and facilitates efficient data exchange. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the water pump control circuit provided in an embodiment of the present invention;

[0011] Figure 2 This is a schematic diagram of the controller provided in an embodiment of the present invention;

[0012] Figure 3 This is a schematic diagram of the structure of the analog voltage signal transmission unit provided in this embodiment of the utility model;

[0013] Figure 4 This is a schematic diagram of the structure of the analog current signal transmission unit provided in this embodiment of the utility model;

[0014] Figure 5 This is a schematic diagram of the structure of the PWM communication unit provided in this embodiment of the present invention;

[0015] Figure 6 This is a schematic diagram of the structure of the CAN communication unit provided in this embodiment of the utility model;

[0016] Figure 7 This is a schematic diagram of the structure of the LIN communication unit provided in this embodiment of the present invention;

[0017] Figure 8 This is a schematic diagram of the structure of the RS485 communication unit provided in this embodiment of the utility model. Detailed Implementation

[0018] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely for explaining this utility model and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this utility model are shown in the accompanying drawings, not all of them.

[0019] This utility model embodiment provides a water pump control circuit that integrates multiple communication control circuits, solving the communication limitations of existing control boards and meeting the diverse communication needs of complex and ever-changing application scenarios. For example... Figure 1 The water pump control circuit shown includes:

[0020] Controller 110;

[0021] The analog signal transmission module 120 is connected to the controller 110 and is used to connect to an external analog signal device to convert the analog signal sent by the external analog signal device into a signal that the controller 110 can recognize.

[0022] The digital signal transmission module 130 is connected to the controller 110 and is used to connect to an external digital signal device to transmit digital communication signals bidirectionally between the external digital signal device and the controller 110.

[0023] Optionally, the analog signal transmission module includes an analog voltage signal transmission unit and / or an analog current signal transmission unit.

[0024] The controller can be a DSP module, such as... Figure 2 The core utilizes a high-performance microcontroller with powerful data processing capabilities, such as Texas Instruments' TMS2800154 series. This microcontroller can quickly respond to various commands, accurately process data, and comprehensively coordinate the operation of all modules on the control board, ensuring stable and efficient operation of the water pump control board. It may also include a power supply module (not shown in the diagram) that not only provides a stable and compatible operating voltage to the various circuit modules on the control board but also performs fine filtering of the input voltage.

[0025] Optional, such as Figure 3 The analog voltage signal transmission unit includes:

[0026] The first interface CN9 has its first terminal grounded and its second terminal connected to one end of the first resistor R24;

[0027] The other end of the first resistor R24 ​​is connected to one end of the second resistor R17 and one end of the third resistor R83;

[0028] The other end of the second resistor R17 is connected to one end of the first capacitor C16 and the gate of the first diode D3, and the common node of the other end of the second resistor R17, one end of the first capacitor C16 and the gate of the first diode D3 is connected to the controller.

[0029] The other end of the third resistor R83 and the other end of the first capacitor C16 are both grounded;

[0030] The cathode of the first diode D3 is connected to a preset DC power supply, and the anode is grounded.

[0031] The analog voltage signal transmission unit can be a 0-10V voltage communication module, which acquires 0-10V voltage signals and uses operational amplifiers and voltage divider circuits to convert the input 0-10V analog signals into signals that can be recognized by the DSP. This facilitates connection with devices sensitive to analog signals, enables precise data interaction, and is widely used in industrial automation control scenarios.

[0032] Optional, such as Figure 4 The analog current signal transmission unit includes:

[0033] The second interface CN16 has its first terminal grounded, and its second terminal connected to one end of the fourth resistor R33, one end of the fifth resistor R31, and the cathode of the second diode D7.

[0034] The other end of the fifth resistor R31 and the anode of the second diode D7 are grounded;

[0035] The other end of the fourth resistor R33, one end of the second capacitor C22, and the non-inverting input terminal of the first operational amplifier U3 are connected;

[0036] The other end of the second capacitor C22 is grounded;

[0037] The inverting input terminal of the first operational amplifier is connected to its output terminal, and its output terminal is also connected to one end of the sixth resistor R28.

[0038] The other end of the sixth resistor R28 is connected to one end of the third capacitor C34, and then connected to the controller;

[0039] The other end of the third capacitor C34 is grounded.

[0040] Among them, the analog current signal transmission unit can be a 4-20mA current communication module, which collects 4-20mA current signals. This signal has strong anti-interference ability and long transmission distance. It can stably transmit data in harsh industrial environments and is often used in data acquisition and monitoring systems for large industrial equipment.

[0041] Optionally, the digital signal transmission module includes at least one of a pulse width modulation (PWM) communication unit, a controller area network (CAN) bus communication unit, a local area network (LIN) communication unit, and an RS485 communication unit.

[0042] Optional, such as Figure 5 The PWM communication unit includes:

[0043] The third interface CN4 has its first terminal connected to the output terminal of the PWM signal output line, its second terminal grounded, and its third terminal connected to the input terminal of the PWM signal input line.

[0044] The output terminal of the PWM signal output line and one end of the seventh resistor R64 are connected to one end of the fourth capacitor C59;

[0045] The other end of the seventh resistor R64 is connected to the third pin of the first optocoupler and isolator;

[0046] The other end of the fourth capacitor C59 and the fourth pin of the first optocoupler and isolator are both grounded;

[0047] The first pin of the first optocoupler and isolator is connected to one end of the eighth resistor R65, and the second pin of the first optocoupler and isolator is grounded.

[0048] The other end of the eighth resistor R65 is connected to one end of the fifth capacitor C60, and the common node of the other end of the eighth resistor R65 and one end of the fifth capacitor C60 is connected to the controller as the input terminal of the PWM signal output line.

[0049] The other end of the fifth capacitor C60 is grounded;

[0050] The input terminal of the PWM signal input line, one end of the sixth capacitor C61, one end of the ninth resistor R70, and one end of the tenth resistor R73 are connected to the first pin of the second optocoupler and isolator.

[0051] The other end of the sixth capacitor C61 is grounded;

[0052] The other end of the ninth resistor R70 and the collector of the first transistor Q3 are connected to the base of the second transistor Q4;

[0053] The emitter of the first transistor Q3 and one end of the eleventh resistor R75 are connected to one end of the seventh capacitor C69 and grounded;

[0054] The base of the first transistor Q3 is connected to the other end of the eleventh resistor R75, the other end of the seventh capacitor C69, the emitter of the second transistor Q4 is connected to one end of the twelfth resistor R76.

[0055] The collector of the second transistor Q4 and the other end of the tenth resistor R73 and the other end of the twelfth resistor R76 are connected to the second pin of the second optocoupler and isolator.

[0056] The sixth pin of the second optocoupler and isolator and one end of the eighth capacitor C68 are connected to one end of the thirteenth resistor R81, and are connected to a preset DC power supply.

[0057] The fifth pin of the second optocoupler and isolator is connected to the other end of the eighth capacitor C68 and grounded;

[0058] The fourth pin of the second optocoupler and isolator is connected to the other end of the thirteenth resistor R81, and the common node of the fourth pin of the second optocoupler and isolator and the other end of the thirteenth resistor R81 is connected to the controller as the output terminal of the PWM signal input line.

[0059] Among them, the PWM communication unit identifies the duty cycle of the external PWM signal and accurately controls the speed of the water pump motor. At the same time, it can feed back the duty cycle of the PWM signal according to actual needs to achieve linear adjustment of the water pump flow rate, which has significant advantages in constant pressure water supply systems with high requirements for flow accuracy.

[0060] Optional, such as Figure 6 The CAN communication unit includes:

[0061] The CAN transmit terminal CANTX and the CAN receive terminal CANRX are connected to the corresponding terminals on the controller.

[0062] The CAN transmit terminal CANTX and one end of the fourteenth resistor R63 are connected to one end of the ninth capacitor C63;

[0063] The other end of the ninth capacitor C63 is grounded;

[0064] The other end of the fourteenth resistor R63 and one end of the fifteenth resistor R80 are connected to the first pin of the CAN transceiver chip.

[0065] The other end of the fifteenth resistor R80 is connected to a preset DC power supply;

[0066] The CAN receiver terminal CANRX and one end of the sixteenth resistor R66 are connected to one end of the tenth capacitor C62;

[0067] The other end of the tenth capacitor C62 is grounded;

[0068] The other end of the sixteenth resistor R66 and one end of the seventeenth resistor R79 are connected to the fourth pin of the CAN transceiver chip.

[0069] The other end of the seventeenth resistor R79 is connected to the preset DC power supply;

[0070] The second pin of the CAN transceiver chip U10 is grounded, and the fifth pin is connected to a preset DC power supply.

[0071] The eighth pin of the CAN transceiver chip is connected to one end of the eighteenth resistor R74;

[0072] The other end of the eighteenth resistor R74 is grounded;

[0073] The seventh pin of the CAN transceiver chip is connected to the first end of the common-mode inductor L4;

[0074] The sixth pin of the CAN transceiver chip is connected to the second terminal of the common-mode inductor L4;

[0075] The third terminal of the common mode inductor L4 is connected to one end of the eleventh capacitor C57, and the other end of the eleventh capacitor C57 is grounded.

[0076] The fourth terminal of the common mode inductor L4 is connected to one end of the twelfth capacitor C58, and the other end of the twelfth capacitor C58 is grounded.

[0077] One end of the eleventh capacitor C57 is connected to one end of the nineteenth resistor R68;

[0078] One end of the twelfth capacitor C58 is connected;

[0079] The other end of the nineteenth resistor R68 and one end of the twentieth resistor R67 are connected separately, and also connected to one end of the thirteenth capacitor C56.

[0080] The other end of the thirteenth capacitor C56 is grounded;

[0081] One end of the nineteenth resistor R68 is connected to the second end of the first two-channel bidirectional diode D6, one end of the twentieth resistor R67 is connected to the first end of the first two-channel bidirectional diode D6, and the third end of the first two-channel bidirectional diode D6 is grounded.

[0082] One end of the nineteenth resistor R68 serves as the CAN high-level terminal CANH, connecting to the second terminal of the fourth interface CN12. The other end of the twentieth resistor R67 serves as the CAN low-level terminal CANL, connecting to the first terminal of the fourth interface CN12.

[0083] The CAN communication unit can use the classic CAN communication circuit, which has high reliability and anti-interference capabilities. It is suitable for fields with extremely high requirements for real-time performance and reliability, such as automotive electronics and industrial automation, and can realize high-speed and stable communication between the water pump and other CAN node devices.

[0084] Optional, such as Figure 7 The LIN communication unit includes:

[0085] The fifth interface CN11 has its first terminal connected to the anode of the third diode D8, its second terminal connected to one end of the first inductor L3, and its third terminal grounded.

[0086] The anode of the third diode D8 is connected to the first terminal of the second 2-channel bidirectional diode D9, one terminal of the first inductor L3 is connected to the second terminal of the second 2-channel bidirectional diode D9, and the third terminal of the second 2-channel bidirectional diode D9 is grounded.

[0087] The cathode of the third diode D8, the anode of the fourth diode D13, one end of the twenty-first resistor R50, one end of the fourteenth capacitor C55, and one end of the fifteenth capacitor C72 are connected.

[0088] The cathode of the fourth diode D13 is connected to one end of the twenty-second resistor R48.

[0089] The other end of the twenty-second resistor R48 is connected to the other end of the first inductor L3;

[0090] The other end of the first inductor L3 and one end of the sixteenth capacitor C51 are connected to the sixth pin of the LIN transceiver chip.

[0091] The other end of the sixteenth capacitor C51 is grounded;

[0092] One end of the fourteenth capacitor C55 and one end of the fifteenth capacitor C72 are both connected to the seventh pin of the LIN transceiver chip, and the other ends of the fourteenth capacitor C55 and the fifteenth capacitor C72 are both grounded.

[0093] Pin 8 of the LIN transceiver chip U8 is connected to one end of the 23rd resistor R62, and the other end of the 23rd resistor R62 is grounded.

[0094] The fifth pin of the LIN transceiver chip is grounded;

[0095] Connect pin 4 of the LIN transceiver chip and one end of the 24th resistor R77.

[0096] The other end of the 24th resistor R77 and one end of the 25th resistor R52 are connected to one end of the 17th capacitor C71, and the common node of the other end of the 24th resistor R77, one end of the 25th resistor R52 and one end of the 17th capacitor C71 is used as the LIN transmit terminal LINTX to connect to the controller; the other end of the 17th capacitor C71 is grounded.

[0097] The other end of the twenty-fifth resistor R52 is connected to the preset DC power supply;

[0098] The third pin of the LIN transceiver chip and the other end of the twenty-first resistor R50 are connected.

[0099] The second pin of the LIN transceiver chip is connected to one end of the 26th resistor R53, and the other end of the 26th resistor R53 is connected to the preset DC power supply.

[0100] The first pin of the LIN transceiver chip and one end of the 27th resistor R78 are connected.

[0101] The other end of the twenty-seventh resistor R78 and one end of the eighteenth capacitor C38 are connected to one end of the twenty-eighth resistor R54. The other end of the eighteenth capacitor C38 is grounded, and the other end of the twenty-eighth resistor R54 is connected to the preset DC power supply.

[0102] The common node of the other end of the twenty-seventh resistor R78, one end of the eighteenth capacitor C38, and one end of the twenty-eighth resistor R54 serves as the LIN receiver terminal LINTR connected to the controller.

[0103] The LIN communication unit can use a dedicated LIN transceiver, which follows the LIN bus protocol. It is low in cost and simple in structure. It is mainly used for the control of auxiliary equipment inside the car, which facilitates communication between the water pump and other LIN bus devices in the car, so as to realize the coordinated control of the whole vehicle system.

[0104] Optional, such as Figure 8 The RS485 communication unit includes:

[0105] The sixth interface CN15 has its second terminal and one end of the twenty-ninth resistor R47 connected to one end of the nineteenth capacitor C50, and its first terminal and one end of the thirtieth resistor R56 connected to one end of the twentieth capacitor C49; the other ends of the nineteenth capacitor C50 and the other ends of the twentieth capacitor C49 are both grounded.

[0106] The other end of the twenty-ninth resistor R47 is connected to one end of the first bipolar transient voltage suppressor diode D12, one end of the thirty-first resistor R49, one end of the thirty-second resistor R45, one end of the twenty-first capacitor C46, ​​and the sixth pin of the RS485 chip U7; the other end of the first bipolar transient voltage suppressor diode D12 is grounded, and the other end of the thirty-second resistor R45 is connected to the preset DC power supply.

[0107] The other end of the 30th resistor R56, one end of the second bipolar transient voltage suppressor diode D11, the other end of the 31st resistor R49, the other end of the 21st capacitor C46, ​​and one end of the 33rd resistor R58 are connected to the seventh pin of the RS485 chip U7; the other ends of the second bipolar transient voltage suppressor diode D11 and the other ends of the 33rd resistor R58 are both grounded.

[0108] One end of the twenty-second capacitor C48 and one end of the twenty-third capacitor C73 are both connected to the eighth pin of the RS485 chip U7, and the other ends of the twenty-second capacitor C48 and the twenty-third capacitor C73 are both grounded; the fifth pin of the RS485 chip U7 is grounded.

[0109] The fourth pin of the RS485 chip U7 is connected to one end of the thirty-fourth resistor R46;

[0110] The other end of the 34th resistor R46 is connected to one end of the 35th resistor R51. The other end of the 35th resistor R51 is grounded. The common node of the other end of the 34th resistor R46 and one end of the 35th resistor R51 is connected to the controller as the 485 transmitter 485TX.

[0111] The third pin and the second pin of RS485 chip U7 are both connected to one end of the thirty-sixth resistor R44. The other end of the thirty-sixth resistor R44 is connected to the controller as the 485 enable pin EN.

[0112] The first pin of RS485 chip U7 is connected to one end of the thirty-seventh resistor R61. The other end of the thirty-seventh resistor R61 and one end of the thirty-eighth resistor R57 are connected to one end of the twenty-fourth capacitor C52. The common node of the other end of the thirty-seventh resistor R61, the end of the thirty-eighth resistor R57 and the end of the twenty-fourth capacitor C52 serves as the 485 receiver 485RX connected to the controller.

[0113] The other end of the thirty-eighth resistor R57 is connected to the preset DC power supply, and the other end of the twenty-fourth capacitor C52 is grounded.

[0114] The RS485 communication unit can use common RS485 communication circuits and supports the MODBUS protocol. It can achieve long-distance and stable data transmission in complex industrial environments and can be networked with many sensors, controllers and other devices that support RS485 interfaces. The effective transmission distance can reach more than 1,000 meters.

[0115] This utility model embodiment also provides a water pump, including the water pump control circuit provided in any of the above embodiments.

[0116] Although the present invention has been described in detail above with general descriptions, specific embodiments, and experiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A water pump control circuit, characterized in that, include: Controller; The analog signal transmission module, connected to the controller, is used to connect to an external analog signal device and convert the analog signals sent by the external analog signal device into signals that the controller can recognize. The digital signal transmission module, connected to the controller, is used to connect to external digital signal devices and transmit digital communication signals bidirectionally between the external digital signal devices and the controller.

2. The water pump control circuit according to claim 1, characterized in that, The analog signal transmission module includes an analog voltage signal transmission unit and / or an analog current signal transmission unit.

3. The water pump control circuit according to claim 2, characterized in that, The analog voltage signal transmission unit includes: The first interface (CN9) has its first terminal grounded and its second terminal connected to one end of the first resistor (R24); The other end of the first resistor (R24) is connected to one end of the second resistor (R17) and one end of the third resistor (R83); The other end of the second resistor (R17) is connected to one end of the first capacitor (C16) and the gate of the first diode (D3), and the common node of the other end of the second resistor (R17), one end of the first capacitor (C16) and the gate of the first diode (D3) is connected to the controller. The other end of the third resistor (R83) and the other end of the first capacitor (C16) are both grounded; The cathode of the first diode (D3) is connected to a preset DC power supply, and the anode is grounded.

4. The water pump control circuit according to claim 2, characterized in that, The analog current signal transmission unit includes: The second interface (CN16) has its first terminal grounded, and its second terminal connected to one end of the fourth resistor (R33), one end of the fifth resistor (R31), and the cathode of the second diode (D7). The other end of the fifth resistor (R31) and the anode of the second diode (D7) are grounded; The other end of the fourth resistor (R33), one end of the second capacitor (C22), and the non-inverting input of the first operational amplifier (U3) are connected; The other end of the second capacitor (C22) is grounded; The inverting input of the first operational amplifier is connected to its output, and its output is also connected to one end of the sixth resistor (R28). The other end of the sixth resistor (R28) is connected to one end of the third capacitor (C34), and then connected to the controller; The other end of the third capacitor (C34) is grounded.

5. The water pump control circuit according to claim 1, characterized in that, The digital signal transmission module includes at least one of the following: a pulse width modulation (PWM) communication unit, a controller area network (CAN) bus communication unit, a local area network (LIN) communication unit, and an RS485 communication unit.

6. The water pump control circuit according to claim 5, characterized in that, The PWM communication unit includes: The third interface (CN4) has its first terminal connected to the output terminal of the PWM signal output line, its second terminal grounded, and its third terminal connected to the input terminal of the PWM signal input line. The output terminal of the PWM signal output line and one end of the seventh resistor (R64) are connected to one end of the fourth capacitor (C59); The other end of the seventh resistor (R64) is connected to the third pin of the first optocoupler and isolator; The other end of the fourth capacitor (C59) and the fourth pin of the first optocoupler and isolator are both grounded; The first pin of the first optocoupler and isolator is connected to one end of the eighth resistor (R65), and the second pin of the first optocoupler and isolator is grounded; The other end of the eighth resistor (R65) is connected to one end of the fifth capacitor (C60), and the common node of the other end of the eighth resistor (R65) and one end of the fifth capacitor (C60) is connected to the controller as the input terminal of the PWM signal output line; The other end of the fifth capacitor (C60) is grounded; The input terminal of the PWM signal input line, one end of the sixth capacitor (C61), one end of the ninth resistor (R70), and one end of the tenth resistor (R73) are connected to the first pin of the second optocoupler and isolator. The other end of the sixth capacitor (C61) is grounded; The other end of the ninth resistor (R70) and the collector of the first transistor (Q3) are connected to the base of the second transistor (Q4); The emitter of the first transistor (Q3) and one end of the eleventh resistor (R75) are connected to one end of the seventh capacitor (C69) and grounded; The base of the first transistor (Q3) and the other end of the eleventh resistor (R75), the other end of the seventh capacitor (C69), the emitter of the second transistor (Q4) and one end of the twelfth resistor (R76) are connected. The collector of the second transistor (Q4) and the other end of the tenth resistor (R73), and the other end of the twelfth resistor (R76) are connected to the second pin of the second optocoupler and isolator; The sixth pin of the second optocoupler and isolator and one end of the eighth capacitor (C68) are connected to one end of the thirteenth resistor (R81), and are connected to a preset DC power supply. The fifth pin of the second optocoupler and isolator is connected to the other end of the eighth capacitor (C68) and grounded; The fourth pin of the second optocoupler and isolator is connected to the other end of the thirteenth resistor (R81), and the common node of the fourth pin of the second optocoupler and isolator and the other end of the thirteenth resistor (R81) is connected to the controller as the output terminal of the PWM signal input line.

7. The water pump control circuit according to claim 5, characterized in that, The CAN communication unit includes: The CAN transmit terminal (CANTX) and CAN receive terminal (CANRX) are connected to the corresponding terminals on the controller; The CAN transmit terminal (CANTX) and one end of the fourteenth resistor (R63) are connected to one end of the ninth capacitor (C63); The other end of the ninth capacitor (C63) is grounded; The other end of the fourteenth resistor (R63) and one end of the fifteenth resistor (R80) are connected to the first pin of the CAN transceiver chip; The other end of the fifteenth resistor (R80) is connected to the preset DC power supply; One end of the CAN receive terminal (CANRX) and the sixteenth resistor (R66) is connected to one end of the tenth capacitor (C62); The other end of the tenth capacitor (C62) is grounded; The other end of the sixteenth resistor (R66) and one end of the seventeenth resistor (R79) are connected to the fourth pin of the CAN transceiver chip. The other end of the seventeenth resistor (R79) is connected to the preset DC power supply; The second pin of the CAN transceiver chip (U10) is grounded, and the fifth pin is connected to the preset DC power supply; The eighth pin of the CAN transceiver chip is connected to one end of the eighteenth resistor (R74); The other end of the eighteenth resistor (R74) is grounded; The seventh pin of the CAN transceiver chip is connected to the first end of the common-mode inductor (L4); The sixth pin of the CAN transceiver chip is connected to the second end of the common-mode inductor (L4); The third terminal of the common mode inductor (L4) is connected to one end of the eleventh capacitor (C57), and the other end of the eleventh capacitor (C57) is grounded. The fourth terminal of the common mode inductor (L4) is connected to one end of the twelfth capacitor (C58), and the other end of the twelfth capacitor (C58) is grounded; One end of the eleventh capacitor (C57) is connected to one end of the nineteenth resistor (R68); One end of the twelfth capacitor (C58) and its connection; The other end of the nineteenth resistor (R68) and one end of the twentieth resistor (R67) are connected separately, and also connected to one end of the thirteenth capacitor (C56); The other end of the thirteenth capacitor (C56) is grounded; One end of the nineteenth resistor (R68) is connected to the second end of the first 2-channel bidirectional diode (D6), one end of the twentieth resistor (R67) is connected to the first end of the first 2-channel bidirectional diode (D6), and the third end of the first 2-channel bidirectional diode (D6) is grounded. One end of the nineteenth resistor (R68) serves as the CAN high-level terminal (CANH) connected to the second terminal of the fourth interface (CN12), and one end of the twentieth resistor (R67) serves as the CAN low-level terminal (CANL) connected to the first terminal of the fourth interface (CN12).

8. The water pump control circuit according to claim 5, characterized in that, The LIN communication unit includes: The fifth interface (CN11) has its first terminal connected to the anode of the third diode (D8), its second terminal connected to one end of the first inductor (L3), and its third terminal grounded. The anode of the third diode (D8) is connected to the first terminal of the second 2-channel bidirectional diode (D9), one terminal of the first inductor (L3) is connected to the second terminal of the second 2-channel bidirectional diode (D9), and the third terminal of the second 2-channel bidirectional diode (D9) is grounded. The cathode of the third diode (D8) and the anode of the fourth diode (D13), one end of the twenty-first resistor (R50), one end of the fourteenth capacitor (C55) and one end of the fifteenth capacitor (C72) are connected; The cathode of the fourth diode (D13) is connected to one end of the twenty-second resistor (R48); The other end of the twenty-second resistor (R48) is connected to the other end of the first inductor (L3); The other end of the first inductor (L3) and one end of the sixteenth capacitor (C51) are connected to the sixth pin of the LIN transceiver chip; The other end of the sixteenth capacitor (C51) is grounded; One end of the fourteenth capacitor (C55) and one end of the fifteenth capacitor (C72) are both connected to the seventh pin of the LIN transceiver chip, and the other ends of the fourteenth capacitor (C55) and the fifteenth capacitor (C72) are both grounded. The eighth pin of the LIN transceiver chip (U8) is connected to one end of the twenty-third resistor (R62), and the other end of the twenty-third resistor (R62) is grounded. The fifth pin of the LIN transceiver chip is grounded; Connect pin 4 of the LIN transceiver chip and one end of the 24th resistor (R77); The other end of the 24th resistor (R77) and one end of the 25th resistor (R52) are connected to one end of the 17th capacitor (C71), and the common node of the other end of the 24th resistor (R77), one end of the 25th resistor (R52) and one end of the 17th capacitor (C71) is connected to the controller as a LIN transmit terminal (LINTX); the other end of the 17th capacitor (C71) is grounded. The other end of the 25th resistor (R52) is connected to the preset DC power supply; Connect the third pin of the LIN transceiver chip to the other end of the twenty-first resistor (R50); The second pin of the LIN transceiver chip is connected to one end of the 26th resistor (R53), and the other end of the 26th resistor (R53) is connected to the preset DC power supply. The first pin of the LIN transceiver chip is connected to one end of the 27th resistor (R78); The other end of the twenty-seventh resistor (R78) and one end of the eighteenth capacitor (C38) are connected to one end of the twenty-eighth resistor (R54). The other end of the eighteenth capacitor (C38) is grounded, and the other end of the twenty-eighth resistor (R54) is connected to a preset DC power supply. The common node of the other end of the twenty-seventh resistor (R78), one end of the eighteenth capacitor (C38), and one end of the twenty-eighth resistor (R54) is connected to the controller as a LIN receive terminal (LINTR).

9. The water pump control circuit according to claim 5, characterized in that, The RS485 communication unit includes: The sixth interface (CN15) has its second terminal and one end of the twenty-ninth resistor (R47) connected to one end of the nineteenth capacitor (C50), and its first terminal and one end of the thirtieth resistor (R56) connected to one end of the twentieth capacitor (C49); the other ends of the nineteenth capacitor (C50) and the twentieth capacitor (C49) are both grounded. The other end of the 29th resistor (R47) is connected to one end of the first bipolar transient voltage suppressor diode (D12), one end of the 31st resistor (R49), one end of the 32nd resistor (R45), one end of the 21st capacitor (C46), and the sixth pin of the RS485 chip (U7); the other end of the first bipolar transient voltage suppressor diode (D12) is grounded, and the other end of the 32nd resistor (R45) is connected to a preset DC power supply; The other end of the 30th resistor (R56), one end of the second bipolar transient voltage suppressor diode (D11), the other end of the 31st resistor (R49), the other end of the 21st capacitor (C46), and one end of the 33rd resistor (R58) are connected to the seventh pin of the RS485 chip (U7); the other end of the second bipolar transient voltage suppressor diode (D11) and the other end of the 33rd resistor (R58) are both grounded; One end of the twenty-second capacitor (C48) and one end of the twenty-third capacitor (C73) are both connected to the eighth pin of the RS485 chip (U7). The other ends of the twenty-second capacitor (C48) and the twenty-third capacitor (C73) are both grounded. The fifth pin of the RS485 chip (U7) is grounded. The fourth pin of the RS485 chip (U7) is connected to one end of the thirty-fourth resistor (R46); The other end of the 34th resistor (R46) is connected to one end of the 35th resistor (R51), the other end of the 35th resistor (R51) is grounded, and the common node of the other end of the 34th resistor (R46) and one end of the 35th resistor (R51) is connected to the controller as a 485 transmitter (485TX). The third pin and the second pin of the RS485 chip (U7) are both connected to one end of the thirty-sixth resistor (R44), and the other end of the thirty-sixth resistor (R44) is connected to the controller as the 485 enable pin (EN). The first pin of the RS485 chip (U7) is connected to one end of the thirty-seventh resistor (R61). The other end of the thirty-seventh resistor (R61) and one end of the thirty-eighth resistor (R57) are connected to one end of the twenty-fourth capacitor (C52). The common node of the other end of the thirty-seventh resistor (R61), one end of the thirty-eighth resistor (R57), and one end of the twenty-fourth capacitor (C52) serves as the 485 receiver (485RX) connected to the controller. The other end of the thirty-eighth resistor (R57) is connected to the preset DC power supply, and the other end of the twenty-fourth capacitor (C52) is grounded.

10. A water pump comprising the water pump control circuit according to any one of claims 1-9.

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