Novel permanent magnet synchronous variable frequency pump controller

Abstract

The utility model discloses a novel permanent magnet synchronous variable frequency pump controller, which comprises a controller main body, the controller main body comprises a main control board and a display board, the main control board is communicated with the display board through a UART serial port, and the main control board provides a 5V isolation power supply to supply power to the display board. The main control board comprises a power supply circuit, a DSP main control circuit, an IPM module driving circuit, a voltage / current sampling circuit and a communication interface circuit. Through cooperation of the main control board and the display board, vector control can be carried out on the water pump motor, and personnel can be reminded in time when the water pump breaks down in the working process, so that a user can know the operation condition of the water pump clearly and conveniently, and good man-machine interaction experience can be provided for the user; in addition, overcurrent and over-temperature protection can be carried out on the water pump controller, so that the control motor can operate stably.

Description

Technical Field

[0001] The utility model relates to the technical field of controllers, in particular to a novel permanent magnet synchronous variable frequency pump controller. Background Art

[0002] A permanent magnet synchronous variable frequency pump is a water pump driven by a permanent magnet synchronous motor and a frequency converter. On the basis of a traditional water pump, by adding a permanent magnet synchronous motor and a frequency converter, the flow rate and head of the water pump can be achieved by dynamically adjusting the speed of the motor through the frequency converter. The permanent magnet synchronous variable frequency pump is controlled by a controller. The permanent magnet synchronous motor uses permanent magnets as the excitation source, which has high efficiency and high power factor, making the energy consumption of the water pump lower. The frequency converter can adjust the speed of the water pump according to actual needs, making the water pump operation more stable and reducing the operating noise and vibration of the water pump; the controller on the permanent magnet synchronous variable frequency pump in the existing technology lacks efficient vector control of the water pump motor, and cannot promptly remind personnel when a failure occurs in the water pump operation. The human-computer interaction experience is not ideal and cannot meet the use requirements. Based on the above situation, we have proposed a new permanent magnet synchronous variable frequency pump controller. Utility Model Content

[0003] The purpose of the utility model is to solve the shortcomings of the prior art and to propose a new type of permanent magnet synchronous variable frequency pump controller.

[0004] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0005] A novel permanent magnet synchronous variable frequency pump controller includes a controller body, the controller body includes a main control board and a display board, the main control board and the display board communicate through an ISO serial port and a UART serial port, the main control board includes a power supply circuit, a DSP main control circuit, an IPM module drive circuit, a voltage / current sampling circuit and a communication interface circuit;

[0006] The display panel includes a temperature / pressure sensor interface circuit, a digital tube display circuit, a status indicator light circuit, an MCU circuit, a buzzer circuit and a touch sensing circuit.

[0007] Preferably, the IPM module drive circuit includes an IPM module U18, and the pin 24 of the IPM module U18 is electrically connected to the +PV direct current generated after the 220V mains power is rectified by the rectifier bridge, which will serve as the driving power supply for the water pump motor. The pin 24 of the IPM module U18 is also electrically connected to one end of the capacitor C53, and the pin 2 of the IPM module U18 is electrically connected to one end of the bootstrap capacitor E3, the negative electrode of the diode D13 and one end of the capacitor C51. The other end of the bootstrap capacitor E3, the positive electrode of the diode D13 and the other end of the capacitor C51 are all electrically connected to the pin 23 of the IPM module U18. The other end of the bootstrap capacitor E3, the positive electrode of the diode D13 and the other end of the capacitor C51 are electrically connected to the U-phase interface of the same drive motor;

[0008] Pin 3 of the IPM module U18 is electrically connected to one end of the bootstrap capacitor E1, the cathode of the diode D14, and one end of the capacitor C55. The other end of the bootstrap capacitor E1, the anode of the diode D14, and the other end of the capacitor C55 are all electrically connected to pin 22 of the IPM module U18. The other end of the bootstrap capacitor E1, the anode of the diode D14, and the other end of the capacitor C55 are electrically connected to the V-phase interface of the same drive motor.

[0009] Pin 4 of the IPM module U18 is electrically connected to one end of the bootstrap capacitor E2, the cathode of the diode D5, and one end of the capacitor C56. The other end of the bootstrap capacitor E2, the anode of the diode D5, and the other end of the capacitor C56 are all electrically connected to pin 21 of the IPM module U18. The other end of the bootstrap capacitor E2, the anode of the diode D5, and the other end of the capacitor C56 are electrically connected to the W-phase interface of the same drive motor.

[0010] Pin 8 and pin 13 of the IPM module U18 are electrically connected to one end of capacitor C57, the cathode of diode D15 and one end of capacitor C58, and the other end of capacitor C57, the anode of diode D15 and the other end of capacitor C58 are all grounded. Pin 14 of the IPM module U18 is a fault output pin, which is electrically connected to one end of resistor R76. Pin 15 of the IPM module U18 is electrically connected to one end of capacitor C59 and one end of resistor R77, and the other end of capacitor C59 is grounded. Pin 16 of the IPM module U18 is electrically connected to the other end of capacitor C57, the anode of diode D15, the other end of capacitor C58 and the cathode of capacitor C59. The other end is electrically connected, pin 17 of the IPM module U18 is electrically connected to the positive electrode of the diode D3 and one end of the resistor R78, the negative electrode of the diode D3 is electrically connected to a 3.3V voltage, the other end of the resistor R78 is grounded, pin 20, pin 19 and pin 18 of the IPM module U18 are electrically connected to one end of the resistor R79, one end of the resistor R80 and one end of the resistor R81, respectively, the other end of the resistor R79, the other end of the resistor R80 and the other end of the resistor R81 are all electrically connected to the other end of the resistor R77, and the other end of the resistor R79 is also electrically connected to one end of the resistor R57, one end of the resistor R72 and one end of the resistor R73.

[0011] Preferably, the DSP main control circuit includes a DSP main control chip, and the SPWM signal generated by the DSP main control chip is connected to pins 5, 6, 7, 10, 11 and 12 of the IPM module U18.

[0012] Preferably, the status indicator light circuit includes an LED driver chip IC2, the LED driver chip IC2 communicates with the MCU circuit on the display panel through an I2C bus, pin 10 of the LED driver chip IC2 is electrically connected to an ISO-5V isolated power supply, the ISO-5V isolated power supply is electrically connected to one end of capacitor C15 and one end of capacitor C14, and the other end of capacitor C15 and the other end of capacitor C14 are electrically connected to an isolation device G-ISO.

[0013] Preferably, the status indicator lights in the status indicator light circuit include a fault indicator light, a speed indicator light and a timing indicator light.

[0014] Preferably, the fault indicator light includes information such as low temperature alarm, communication failure, leakage protection, water shortage protection, motor failure, etc. The speed indicator light selects the number of speed lights that light up according to the speed of rotation, and the user can intuitively feel the rotation speed information of the motor.

[0015] Compared with the existing technology, the beneficial effects of the utility model are:

[0016] 1. Through the coordination of DSP main control circuit, voltage / current sampling circuit, IPM module drive circuit, power supply circuit and communication interface circuit, vector control of water pump motor can be realized;

[0017] 2. The display board integrates digital tube display circuit, status indicator circuit, MCU circuit, buzzer circuit, and touch sensing circuit, which can promptly remind personnel when a fault occurs during the operation of the water pump, so that users can clearly know the operation status of the water pump and provide users with a good human-computer interaction experience;

[0018] 3. Through the cooperation of the main control board and the display board, the water pump controller can be protected against overcurrent and overtemperature, which can effectively reduce the risk of damage to the water pump controller during use, thereby ensuring the stable operation of the control motor;

[0019] The utility model cooperates with the main control board and the display board to perform vector control on the water pump motor, and can promptly remind personnel when a fault occurs during the operation of the water pump, so that users can clearly know the operation status of the water pump and provide users with a good human-computer interaction experience. In addition, the water pump controller can be protected from overcurrent and overtemperature, so that the control motor can operate stably. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a system block diagram of a new type of permanent magnet synchronous variable frequency pump controller proposed in this utility model;

[0021] Figure 2 This is a circuit diagram of the IPM module drive circuit of a new type of permanent magnet synchronous variable frequency pump controller proposed in this utility model;

[0022] Figure 3 This is the circuit diagram of the LED driver chip IC2 of a new permanent magnet synchronous variable frequency pump controller proposed in this utility model;

[0023] Figure 4 This is a circuit diagram of the components connected to pin 10 of the LED driver chip IC2 of a new type of permanent magnet synchronous variable frequency pump controller proposed in this utility model;

[0024] Figure 5 This is a circuit diagram of a fault indicator light for a new type of permanent magnet synchronous variable frequency pump controller proposed in this utility model;

[0025] Figure 6 This is a circuit diagram of a speed indicator light of a new permanent magnet synchronous variable frequency pump controller proposed in this utility model;

[0026] Figure 7 This is a circuit diagram of a timing indicator light of a new permanent magnet synchronous variable frequency pump controller proposed in this utility model. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0028] Reference Figure 1-7 A new type of permanent magnet synchronous variable frequency pump controller includes a controller body, which includes a main control board and a display board. The main control board and the display board communicate through the ISO serial port and the UART serial port. The main control board includes a power supply circuit, a DSP main control circuit, an IPM module drive circuit, a voltage / current sampling circuit, and a communication interface circuit.

[0029] The IPM module drive circuit includes an IPM module U18, and pin 24 of the IPM module U18 is electrically connected to the +PV direct current generated after the 220V mains power is rectified by the rectifier bridge, which will serve as the driving power supply for the water pump motor. Pin 24 of the IPM module U18 is also electrically connected to one end of the capacitor C53, and pin 2 of the IPM module U18 is electrically connected to one end of the bootstrap capacitor E3, the cathode of the diode D13 and one end of the capacitor C51. The other end of the bootstrap capacitor E3, the anode of the diode D13 and the other end of the capacitor C51 are all electrically connected to pin 23 of the IPM module U18. The other end of the bootstrap capacitor E3, the anode of the diode D13 and the other end of the capacitor C51 are electrically connected to the U-phase interface of the same drive motor.

[0030] Pin 3 of the IPM module U18 is electrically connected to one end of the bootstrap capacitor E1, the cathode of the diode D14, and one end of the capacitor C55. The other end of the bootstrap capacitor E1, the anode of the diode D14, and the other end of the capacitor C55 are all electrically connected to pin 22 of the IPM module U18. The other end of the bootstrap capacitor E1, the anode of the diode D14, and the other end of the capacitor C55 are electrically connected to the V-phase interface of the same drive motor.

[0031] Pin 4 of the IPM module U18 is electrically connected to one end of the bootstrap capacitor E2, the cathode of the diode D5, and one end of the capacitor C56. The other end of the bootstrap capacitor E2, the anode of the diode D5, and the other end of the capacitor C56 are all electrically connected to pin 21 of the IPM module U18. The other end of the bootstrap capacitor E2, the anode of the diode D5, and the other end of the capacitor C56 are electrically connected to the W-phase interface of the same drive motor.

[0032] Pin 8 and pin 13 of the IPM module U18 are electrically connected to one end of capacitor C57, the cathode of diode D15 and one end of capacitor C58. The other end of capacitor C57, the anode of diode D15 and the other end of capacitor C58 are all grounded. Pin 14 of the IPM module U18 is a fault output pin, which is electrically connected to one end of resistor R76. Pin 15 of the IPM module U18 is electrically connected to one end of capacitor C59 and one end of resistor R77. The other end of capacitor C59 is grounded. Pin 16 of the IPM module U18 is electrically connected to the other end of capacitor C57, the anode of diode D15, the other end of capacitor C58 and the other end of capacitor C59. One end is electrically connected, pin 17 of the IPM module U18 is electrically connected to the anode of the diode D3 and one end of the resistor R78, the cathode of the diode D3 is electrically connected to a 3.3V voltage, the other end of the resistor R78 is grounded, pin 20, pin 19, and pin 18 of the IPM module U18 are electrically connected to one end of the resistor R79, one end of the resistor R80, and one end of the resistor R81, respectively, the other ends of the resistor R79, the other ends of the resistor R80, and the other ends of the resistor R81 are all electrically connected to the other end of the resistor R77, and the other end of the resistor R79 is also electrically connected to one end of the resistor R57, one end of the resistor R72, and one end of the resistor R73;

[0033] The DSP main control circuit includes a DSP main control chip, and the SPWM signal generated by the DSP main control chip is connected to pins 5, 6, 7, 10, 11 and 12 of the IPM module U18;

[0034] The display panel includes a temperature / pressure sensor interface circuit, a digital tube display circuit, a status indicator circuit, an MCU circuit, a buzzer circuit, and a touch sensing circuit;

[0035] The status indicator circuit includes an LED driver chip IC2. The LED driver chip IC2 communicates with the MCU circuit on the display board via the I2C bus. Pin 10 of the LED driver chip IC2 is electrically connected to an ISO-5V isolated power supply. The ISO-5V isolated power supply is electrically connected to one end of a capacitor C15 and one end of a capacitor C14. The other ends of capacitors C15 and C14 are electrically connected to an isolation device G-ISO.

[0036] The status indicator lights in the status indicator light circuit include a fault indicator light, a speed indicator light and a timing indicator light. The fault indicator light includes information such as low temperature alarm, communication failure, leakage protection, water shortage protection, and motor failure. The speed indicator light selects the number of speed lights that light up according to the speed of rotation, and the user can intuitively feel the rotation speed information of the motor; the utility model can perform vector control on the water pump motor through the cooperation of the main control board and the display board, and can promptly remind personnel when a failure occurs during the operation of the water pump, so that the user can clearly know the operation status of the water pump, and can provide users with a good human-computer interaction experience. In addition, the water pump controller can be protected from overcurrent and overtemperature, so that the control motor can run stably.

[0037] Working principle: When in use, the 220V mains electricity is converted into various voltages required for the operation of the DSP main control system through the power supply circuit on the main control board, and an isolated 5V_ISO power supply is generated to power the display board. The display board communicates with the main control board through the serial port. The temperature / pressure sensor interface circuit on the display board can sample and convert the current water temperature and water pressure through the ADC of the MCU circuit in real time, and then send the sampled data to the DSP main control chip on the main control board through the serial port. The user's operation instructions are sent to the DSP main control chip on the main control board in real time through the serial port on the display board to realize the control of the water pump. The system is controlled by the DSP main control circuit, IPM module drive circuit, voltage and current sampling circuit, and communication interface circuit integrated on the main control board, which can efficiently realize vector control of the water pump motor. In addition, the +PV DC power generated by the 220V AC power after rectification by the rectifier bridge will be used as the driving power supply of the water pump motor and connected to pin 24 of the IPM module U18. The SPWM signal generated by the DSP main control chip on the main control board is connected to the INUH, INVH, INWH, INUL, INVL and INWL pins of the IPM module U18, thereby further vector control of the water pump motor.

[0038] At the same time, the display board integrates digital tube display circuit, status indicator circuit, MCU circuit, buzzer circuit, and touch sensing circuit, which can provide users with a good human-computer interaction experience;

[0039] After the system is powered on, the power supply circuit on the main control board will generate 15V DC as the charging power supply for the bootstrap capacitors E1, E2, and E3. The DSP main control chip will control the three lower tubes of the IPM module U18 to conduct in turn to complete the charging of the three bootstrap capacitors E1, E2, and E3; Pin 14 of the IPM module U18 is the fault output pin. When the 15V voltage is abnormal or overcurrent occurs, a fault signal will be generated and input to the GPIO port of the DSP main control chip on the main control board to protect the water pump controller and prevent the motor from burning; Pin 17 of the IPM module is the internal temperature analog signal output pin of the IPM module U18 , connect this pin to the ADC sampling port of the DSP main control chip to collect the working temperature of the IPM module in real time to realize the over-temperature protection function; resistors R57, R72 and R73 are over-current protection setting resistors. The over-current protection threshold can be set by changing the resistance value; resistors R79, R80 and R81 are current sensing resistors. When the motor is running, the voltage across the current sensing resistor is sampled by the ADC, which can facilitate the DSP chip to efficiently control the motor operation state. By protecting the water pump controller from over-current and over-temperature, the risk of damage to the water pump controller during use can be effectively reduced, thereby ensuring the stable operation of the controlled motor.

[0040] The LED driver chip IC2 communicates with the MCU circuit on the display board through the I2C bus; when the water pump fails, the DSP main control chip will send the fault code to the display board through the serial port, and the corresponding fault light on the display board will light up. At the same time, the digital tube display circuit will display the fault code to facilitate users to understand the fault information of the water pump system; when the water pump motor rotates, the DSP main control chip of the main control board will send the motor rotation speed information to the display board through the serial port. The speed indicator light on the display board selects the number of speed lights that light up according to the speed of rotation, and the user can intuitively feel the motor rotation speed information; at the same time, the user can set the household water pump to start at a time. When setting, the corresponding timing indicator light will light up and change the lighting state according to the countdown time information to facilitate user use, so that the user can clearly know the operation status of the water pump.

[0041] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A new type of permanent magnet synchronous variable frequency pump controller, including a controller body, the controller body including a main control board and a display board, characterized in that: The main control board communicates with the display board through the ISO serial port and the UART serial port. The main control board includes a power supply circuit, a DSP main control circuit, an IPM module drive circuit, a voltage / current sampling circuit and a communication interface circuit; The display panel includes a temperature / pressure sensor interface circuit, a digital tube display circuit, a status indicator light circuit, an MCU circuit, a buzzer circuit and a touch sensing circuit.

2. A novel permanent magnet synchronous variable frequency pump controller according to claim 1, characterized in that: The IPM module drive circuit includes an IPM module U18, and pin 24 of the IPM module U18 is electrically connected to the +PV direct current generated after the 220V mains power is rectified by the rectifier bridge, which will serve as the driving power supply for the water pump motor. Pin 24 of the IPM module U18 is also electrically connected to one end of the capacitor C53, and pin 2 of the IPM module U18 is electrically connected to one end of the bootstrap capacitor E3, the negative electrode of the diode D13 and one end of the capacitor C51. The other end of the bootstrap capacitor E3, the positive electrode of the diode D13 and the other end of the capacitor C51 are all electrically connected to pin 23 of the IPM module U18. The other end of the bootstrap capacitor E3, the positive electrode of the diode D13 and the other end of the capacitor C51 are electrically connected to the U-phase interface of the same drive motor; Pin 3 of the IPM module U18 is electrically connected to one end of the bootstrap capacitor E1, the cathode of the diode D14, and one end of the capacitor C55. The other end of the bootstrap capacitor E1, the anode of the diode D14, and the other end of the capacitor C55 are all electrically connected to pin 22 of the IPM module U18. The other end of the bootstrap capacitor E1, the anode of the diode D14, and the other end of the capacitor C55 are electrically connected to the V-phase interface of the same drive motor. Pin 4 of the IPM module U18 is electrically connected to one end of the bootstrap capacitor E2, the cathode of the diode D5, and one end of the capacitor C56. The other end of the bootstrap capacitor E2, the anode of the diode D5, and the other end of the capacitor C56 are all electrically connected to pin 21 of the IPM module U18. The other end of the bootstrap capacitor E2, the anode of the diode D5, and the other end of the capacitor C56 are electrically connected to the W-phase interface of the same drive motor. Pin 8 and pin 13 of the IPM module U18 are electrically connected to one end of capacitor C57, the cathode of diode D15 and one end of capacitor C58, and the other end of capacitor C57, the anode of diode D15 and the other end of capacitor C58 are all grounded. Pin 14 of the IPM module U18 is a fault output pin, which is electrically connected to one end of resistor R76. Pin 15 of the IPM module U18 is electrically connected to one end of capacitor C59 and one end of resistor R77, and the other end of capacitor C59 is grounded. Pin 16 of the IPM module U18 is electrically connected to the other end of capacitor C57, the anode of diode D15, the other end of capacitor C58 and the cathode of capacitor C59. The other end is electrically connected, pin 17 of the IPM module U18 is electrically connected to the positive electrode of the diode D3 and one end of the resistor R78, the negative electrode of the diode D3 is electrically connected to a 3.3V voltage, the other end of the resistor R78 is grounded, pin 20, pin 19 and pin 18 of the IPM module U18 are electrically connected to one end of the resistor R79, one end of the resistor R80 and one end of the resistor R81, respectively, the other end of the resistor R79, the other end of the resistor R80 and the other end of the resistor R81 are all electrically connected to the other end of the resistor R77, and the other end of the resistor R79 is also electrically connected to one end of the resistor R57, one end of the resistor R72 and one end of the resistor R73.

3. A novel permanent magnet synchronous variable frequency pump controller according to claim 2, characterized in that: The DSP main control circuit includes a DSP main control chip, and the SPWM signal generated by the DSP main control chip is connected to pins 5, 6, 7, 10, 11 and 12 of the IPM module U18.

4. A novel permanent magnet synchronous variable frequency pump controller according to claim 1, characterized in that: The status indicator light circuit includes an LED driver chip IC2, which communicates with the MCU circuit on the display panel through an I2C bus. Pin 10 of the LED driver chip IC2 is electrically connected to an ISO-5V isolated power supply, and the ISO-5V isolated power supply is electrically connected to one end of a capacitor C15 and one end of a capacitor C14. The other end of the capacitor C15 and the other end of the capacitor C14 are electrically connected to an isolation device G-ISO.

5. A novel permanent magnet synchronous variable frequency pump controller according to claim 1, characterized in that: The status indicator lights in the status indicator light circuit include a fault indicator light, a speed indicator light and a timing indicator light.

6. A novel permanent magnet synchronous variable frequency pump controller according to claim 5, characterized in that: The fault indicator light includes low temperature alarm, communication failure, leakage protection, water shortage protection, and motor failure information. The speed indicator light selects the number of speed lights that light up according to the speed of rotation, so that the user can intuitively feel the rotation speed information of the motor.

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