Swimming pool water pump control circuit

Abstract

The utility model belongs to the technical field of swimming pool water pump control, and particularly discloses a swimming pool water pump control circuit which comprises a main control unit, a sampling amplification unit used for load current feedback, a driving unit adopting a parallel operation driving MOS, a connecting unit used for being connected with a swimming pool water pump and a power supply unit used for providing a voltage-stabilized source for the driving unit. The driving unit, the sampling amplification unit and the power supply unit are all connected with the main control unit; according to the utility model, through cooperation of the main control unit, the sampling amplification unit, the driving unit, the connection unit and the power supply unit, in the three-phase half-bridge circuit, the MOS transistor connected to each bridge arm can be independently controlled, so that accurate driving of the motor is realized, the main control unit is utilized to generate a pulse width modulation signal, the conduction state of each MOS transistor can be adjusted, and the control precision of the motor is improved. And the rotating speed and the torque of the motor are accurately controlled, so that the purposes of improving the control accuracy of the motor and enhancing the overall reliability are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of pool pump control, and specifically relates to a pool pump control circuit. Background Technique

[0002] The control methods of pool pumps mainly include manual control, automatic control, and intelligent control. Among them, manual control is to control the operation of the pool pump through a manual switch or button. Users need to manually control the switch of the pump according to factors such as the water quality, water volume, and operation time of the pool to ensure the water quality cleanliness and safety of the pool. This method is simple and easy to operate, but requires users to constantly pay attention and make timely adjustments;

[0003] Automatic control is to automatically start and stop the operation of the pump according to preset parameters and indicators such as water quality and water volume. For example, when the water temperature is high and it is not suitable for swimming, the water pump is automatically turned off to avoid power waste. The advantage of automatic control is that users can achieve convenient and unmanned pool management through preset parameters and programs;

[0004] However, no matter which control method, there is an operation of increasing manual intervention, which affects the accuracy of motor control. For example:

[0005] The manual control method requires users to constantly pay attention and manually adjust, increasing the operation burden of users, and may cause water quality problems due to human negligence, resulting in low motor control accuracy.

[0006] Limited intelligence: Although automatic control and intelligent control have greatly improved the convenience and efficiency of pool management, in some complex environments, such as sudden water quality deterioration or equipment failure, manual intervention is still required, which affects the accuracy of motor control.

[0007] Therefore, we need to propose a pool pump control circuit to solve the above existing problems, so that it can improve the accuracy of motor control while enhancing the overall reliability. Content of the Utility Model

[0008] The purpose of the utility model is to provide a pool pump control circuit, which can improve the accuracy of motor control while enhancing the overall reliability, so as to solve the problems raised in the background technique.

[0009] To achieve the above purpose, the utility model provides the following technical solution: A pool pump control circuit includes a main control unit, a sampling and amplifying unit for load current feedback, a driving unit using parallel-connected MOS for driving, a connecting unit for connecting with the pool pump, and a power supply unit for providing a regulated power supply to the driving unit. The driving unit, the sampling and amplifying unit, and the power supply unit are all connected to the main control unit, and the connecting unit is connected to the driving unit;

[0010] The driving unit includes a shunt circuit and a three-phase half-bridge circuit connected to the shunt circuit. The three-phase half-bridge circuit includes three arm units respectively connected to the U-phase, V-phase, and W-phase terminals of the three-phase power supply. The three arm units are connected in parallel, and each arm unit is connected with a current protection circuit.

[0011] Preferably, the shunt circuit is composed of a resistor R1, a resistor R2, a resistor R24, and a resistor R25 connected in parallel. One connection end of the resistor R1, the resistor R2, the resistor R24, and the resistor R25 is grounded, and the other connection end of the resistor R1, the resistor R2, the resistor R24, and the resistor R25 is connected to the three-phase half-bridge circuit.

[0012] Preferably, each arm unit is composed of two MOS switch groups, and each MOS switch group is composed of two MOS switches connected in parallel. One gate terminal of the MOS switch group is connected with a first resistor with a resistance value of 22Ω and one end connected to the main control unit, and a second resistor with a resistance value of 47KΩ and one end connected to a drain of the MOS switch group.

[0013] Preferably, the current protection circuit includes three third resistors with a resistance value of 20KΩ respectively connected to the connection ends of the two MOS switch groups of the arm unit. One end of the third resistor is connected with a first capacitor, a diode D2, and a fourth resistor with a resistance value of 2KΩ connected in parallel.

[0014] Preferably, the main control unit includes a main control chip U1. The 1st pin of the main control chip U1 is connected with a capacitor C2. One end of the capacitor C2 is connected with a diode D5. One end of the diode D5 is connected with a resistor R23 connected to the power supply unit. The connection end of the resistor R23 and the diode D5 is connected in parallel with a diode D6 and a diode D7. One end of the diode D6 is connected to the 4th pin of the main control chip U1 through a capacitor C3, and one end of the diode D7 is connected to the 7th pin of the main control chip U1 through a capacitor C6;

[0015] A capacitor C31 and a capacitor C37 are connected in parallel between the 10th pin and the 12th pin of the main control chip U1. A capacitor C12 is connected between the 15th pin and the 16th pin of the main control chip U1. A capacitor C11 and a diode D8 are connected in parallel between the 51st pin and the 52nd pin of the main control chip U1. A capacitor C35 and a capacitor C36 are connected in parallel between the 37th pin and the 38th pin of the main control chip U1. The 33rd pin of the main control chip U1 is connected with a ground capacitor C34, and the 29th pin of the main control chip U1 is connected with a ground capacitor C27.

[0016] Preferably, the sampling and amplifying unit includes an amplifier U28. A resistor R31 is connected between the negative terminal and the output terminal of the amplifier U28. The output terminal of the amplifier U28 is connected to a resistor R28. One end of the resistor R28 is connected to a ground capacitor C1. The negative terminal of the amplifier U28 is connected to a resistor R30. The positive terminal of the amplifier U28 is connected in parallel with a resistor R20 and a resistor R27, one end of which is connected to the main control chip U1. A capacitor C25 is connected between the resistor R30 and the resistor R20.

[0017] Preferably, the connection unit includes: connectors U10, U11, and U12 respectively connected to the U-phase, V-phase, and W-phase of the three-phase power;

[0018] connectors U3 and U8 connected to the power supply unit, and the connector U3 is connected to the connector U8;

[0019] connectors U4 and U9 connected to the ground wire, and the connector U4 is connected to the connector U9.

[0020] Preferably, the power supply unit includes a power supply and a filter circuit connected to the power supply. The filter circuit is composed of capacitors C30, C40, C41, and C42 connected in parallel. One connection end of the capacitors C30, C40, C41, and C42 is grounded, and the other connection end of the capacitors C30, C40, C41, and C42 is connected to the drive unit.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] Through the cooperation of the main control unit, sampling and amplifying unit, drive unit, connection unit, and power supply unit, in the three-phase half-bridge circuit, each MOS transistor connected to each arm can be controlled independently, so as to achieve precise driving of the motor. By using the main control unit to generate a pulse width modulation signal, the conduction state of each MOS transistor can be adjusted, and then the rotation speed and torque of the motor can be precisely controlled, so as to achieve the purpose of improving the accuracy of motor control while enhancing the overall reliability.

[0023] Through the cooperation of the current protection circuit, shunt circuit, and three-phase half-bridge circuit, the drive circuit can be monitored and protected to prevent the circuit from being damaged, thereby protecting the MOS transistors and the motor, and improving the service life of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a system block diagram of the present invention;

[0025] Figure 2 is a circuit diagram of the drive unit of the present invention;

[0026] Figure 3 The circuit diagram of the power supply unit of the present utility model;

[0027] Figure 4 The circuit diagram of the main control unit of the present utility model;

[0028] Figure 5 The circuit diagram of the connection unit of the present utility model;

[0029] Figure 6 The circuit diagram of the sampling and amplifying unit of the present utility model. Specific embodiments

[0030] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0031] Please refer to Figure 1-6 , the present utility model provides a technical solution: a swimming pool pump control circuit, including a main control unit, a sampling and amplifying unit for load current feedback, a driving unit that uses parallel drive MOS, a connection unit for connecting to a swimming pool pump, and a power supply unit for providing a regulated power supply to the driving unit. The driving unit, the sampling and amplifying unit, and the power supply unit are all connected to the main control unit, and the connection unit is connected to the driving unit; through the cooperation of the main control unit, the sampling and amplifying unit, the driving unit, the connection unit, and the power supply unit, in a three-phase half-bridge circuit, the MOS transistors connected to each arm can be individually controlled, so as to achieve precise driving of the motor. By using the main control unit to generate a pulse width modulation signal, the conduction state of each MOS transistor can be adjusted, and then the speed and torque of the motor can be precisely controlled, so as to achieve the purpose of improving the accuracy of motor control while enhancing the overall reliability.

[0032] The driving unit includes a shunt circuit and a three-phase half-bridge circuit connected to the shunt circuit. The three-phase half-bridge circuit includes three arm units respectively connected to the U-phase, V-phase, and W-phase of the three-phase power supply. The three arm units are connected in parallel, and each arm unit is connected with a current protection circuit. Through the cooperation of the current protection circuit, the shunt circuit, and the three-phase half-bridge circuit, the driving circuit can be monitored and protected to prevent the circuit from being damaged, thereby protecting the MOS transistors and the motor and improving the service life of the motor.

[0033] The shunt circuit consists of a resistor R1, a resistor R2, a resistor R24, and a resistor R25 connected in parallel. One connection end of the resistor R1, the resistor R2, the resistor R24, and the resistor R25 is grounded, and the other connection end of the resistor R1, the resistor R2, the resistor R24, and the resistor R25 is connected to a three-phase half-bridge circuit. The current is shunted through the resistor R1, the resistor R2, the resistor R24, and the resistor R25, thereby reducing the burden on a single component and enhancing the overall reliability of the circuit.

[0034] As Figure 2 shown, each bridge arm unit consists of two MOS switch groups, and each MOS switch group consists of two MOS switches connected in parallel. One gate terminal of the MOS switch group is connected to a first resistor with a resistance value of 22Ω and one end connected to the main control unit (as Figure 2 indicated by R11, R13, R15, R16, R14, and R12 in Figure 2 ), and a second resistor with a resistance value of 47KΩ and one end connected to a drain of the MOS switch group (as

[0035] indicated by R3, R4, R5, R6, R7, and R8 in Figure 2 ). Figure 2 The current protection circuit includes three third resistors with a resistance value of 20KΩ and respectively connected to the connection ends of the two MOS switch groups of the bridge arm unit (as

[0036] indicated by R20, R21, and R22 in

[0037] Figure 2 ). One end of the third resistor is connected to a first capacitor (as Figure 2 indicated by C14, C15, and C16 in

[0036] ), a diode D2 (as indicated by D2, D3, and D4 in the figure), and a fourth resistor with a resistance value of 2KΩ (as indicated by R17, R19, and R18 in the figure) connected in parallel. Through the combined action of the above components, the excessive current is quickly responded to and cut off, thereby preventing the MOS switch group and the entire drive unit from being damaged, and achieving all-round protection of the bridge arm unit.

[0036] The main control unit includes a main control chip U1. One pin of the main control chip U1 is connected to a capacitor C2. One end of the capacitor C2 is connected to a diode D5. One end of the diode D5 is connected to a resistor R23 with one end connected to the power supply unit. A diode D6 and a diode D7 are connected in parallel to the connection end of the resistor R23 and the diode D5. One end of the diode D6 is connected to the 4th pin of the main control chip U1 through a capacitor C3, and one end of the diode D7 is connected to the 7th pin of the main control chip U1 through a capacitor C6;

[0037] A capacitor C31 and a capacitor C37 are connected in parallel between the 10th pin and the 12th pin of the main control chip U1. A capacitor C12 is connected between the 15th pin and the 16th pin of the main control chip U1. A capacitor C11 and a diode D8 are connected in parallel between the 51st pin and the 52nd pin of the main control chip U1. A capacitor C35 and a capacitor C36 are connected in parallel between the 37th pin and the 38th pin of the main control chip U1. A ground capacitor C34 is connected to the 33rd pin of the main control chip U1. A ground capacitor C27 is connected to the 29th pin of the main control chip U1. The main control chip U1 generates a PWM signal through the collaborative work of peripheral components and adjusts the conduction state of the MOS transistor through the PWM signal to achieve precise control of the motor speed and torque.

[0038] The sampling and amplifying unit includes an amplifier U28. A resistor R31 is connected between the negative terminal and the output terminal of the amplifier U28. A resistor R28 is connected to the output terminal of the amplifier U28. One end of the resistor R28 is connected to a ground capacitor C1. A resistor R30 is connected to the negative terminal of the amplifier U28. A resistor R20 and a resistor R27, one end of which is connected to the main control chip U1, are connected in parallel to the positive terminal of the amplifier U28. A capacitor C25 is connected between the resistor R30 and the resistor R20. The current is initially sampled through the resistor R20 and the resistor R27. At the same time, the resistor R20 and the resistor R27 also play a voltage dividing role, converting the load current into a voltage level that can be processed by the amplifier U28. The resistor R31 is used to set the closed-loop gain of the amplifier U28, and the amplification degree of the sampled signal is adjusted to meet the processing requirements of the subsequent circuit.

[0039] The connection unit includes: connectors U10, U11, and U12 respectively connected to the U-phase, V-phase, and W-phase of the three-phase power; connectors U3 and U8 connected to the power supply unit, and the connector U3 is connected to the connector U8; connectors U4 and U9 connected to the ground wire, and the connector U4 is connected to the connector U9. Electrical isolation is carried out through the connectors U10, U11, and U12 to prevent high voltage or high current from being directly transmitted to other low-voltage or sensitive components, thereby protecting the safe operation of the entire system. Through the cooperation of the connector U3 and the connector U8, it is responsible for transmitting the status information of the power supply unit.

[0040] The power supply unit includes a power supply and a filter circuit connected to the power supply. The filter circuit is composed of capacitors C30, C40, C41, and C42 connected in parallel. One connection end of the capacitors C30, C40, C41, and C42 is grounded, and the other connection end of the capacitors C30, C40, C41, and C42 is connected to the drive unit. The noise and fluctuations of the power supply are filtered through the filter circuit to facilitate the provision of a stable DC voltage.

[0041] Although embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A swimming pool water pump control circuit, characterized in that: It includes a main control unit, a sampling and amplifying unit for load current feedback, a driving unit using a parallel driving MOS, a connecting unit for connecting to a swimming pool water pump, and a power supply unit for providing a regulated power supply to the driving unit, wherein the driving unit, the sampling and amplifying unit, and the power supply unit are all connected to the main control unit, and the connecting unit is connected to the driving unit; The driving unit includes a shunt circuit and a three-phase half-bridge circuit connected to the shunt circuit. The three-phase half-bridge circuit includes three bridge arm units respectively connected to the U end, V end and W end of the three-phase electricity. The three bridge arm units are connected in parallel, and each of the bridge arm units is connected to a current protection circuit.

2. A swimming pool water pump control circuit according to claim 1, characterized in that: The shunt circuit is composed of a resistor R1, a resistor R2, a resistor R24 ​​and a resistor R25 which are arranged in parallel. One of the connection ends of the resistors R1, R2, R24 and R25 is grounded, and the other connection ends of the resistors R1, R2, R24 and R25 are connected to a three-phase half-bridge circuit.

3. A swimming pool water pump control circuit according to claim 2, characterized in that: Each bridge arm unit is composed of two MOS switch groups, each MOS switch group is composed of two MOS switches in parallel, a gate end of the MOS switch group is connected to a first resistor with one end connected to the main control unit and a resistance of 22Ω, and a second resistor with one end connected to a drain of the MOS switch group and a resistance of 47KΩ.

4. A swimming pool water pump control circuit according to claim 3, characterized in that: The current protection circuit includes three third resistors with a resistance of 20KΩ, each of which is connected to the two MOS switch group connection ends of the bridge arm unit respectively. One end of the third resistor is connected to a first capacitor, a diode D2 and a fourth resistor with a resistance of 2KΩ which are arranged in parallel.

5. A swimming pool water pump control circuit according to claim 4, characterized in that: The main control unit includes a main control chip U1, wherein pin 1 of the main control chip U1 is connected to a capacitor C2, one end of the capacitor C2 is connected to a diode D5, one end of the diode D5 is connected to a resistor R23 connected to a power supply unit, a diode D6 and a diode D7 are connected in parallel to the connection end of the resistor R23 and the diode D5, one end of the diode D6 is connected to pin 4 of the main control chip U1 through the capacitor C3, and one end of the diode D7 is connected to pin 7 of the main control chip U1 through the capacitor C6; Capacitor C31 and capacitor C37 are connected in parallel between pins 10 and 12 of the main control chip U1, capacitor C12 is connected between pins 15 and 16 of the main control chip U1, capacitor C11 and diode D8 are connected in parallel between pins 51 and 52 of the main control chip U1, capacitor C35 and capacitor C36 are connected in parallel between pins 37 and 38 of the main control chip U1, pin 33 of the main control chip U1 is connected to capacitor C34 to ground, and pin 29 of the main control chip U1 is connected to capacitor C27 to ground.

6. A swimming pool water pump control circuit according to claim 5, characterized in that: The sampling and amplifying unit includes an amplifier U28, a resistor R31 is connected between the negative terminal and the output terminal of the amplifier U28, the output terminal of the amplifier U28 is connected to the resistor R28, one end of the resistor R28 is connected to a capacitor C1 to ground, the negative terminal of the amplifier U28 is connected to a resistor R30, a resistor R20 and a resistor R27, one end of which is connected to the main control chip U1, are connected in parallel to the positive terminal of the amplifier U28, and a capacitor C25 is connected between the resistor R30 and the resistor R20.

7. A swimming pool water pump control circuit according to claim 6, characterized in that: The connection unit includes: a connector U10, a connector U11 and a connector U12 respectively connected to the U terminal, the V terminal and the W terminal of the three-phase electricity; A connector U3 and a connector U8 connected to a power supply unit, wherein the connector U3 is connected to the connector U8; The connector U4 and the connector U9 are connected to the ground line, and the connector U4 is connected to the connector U9.

8. A swimming pool water pump control circuit according to claim 7, characterized in that: The power supply unit includes a power supply and a filter circuit connected to the power supply, wherein the filter circuit is composed of a capacitor C30, a capacitor C40, a capacitor C41 and a capacitor C42 which are arranged in parallel, wherein one of the connection ends of the capacitors C30, C40, C41 and C42 is grounded, and the other connection ends of the capacitors C30, C40, C41 and C42 are connected to the driving unit.

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