Intelligent three-phase water pump controller

Abstract

The utility model discloses an intelligent three-phase water pump controller, which comprises a power board and a DSP control board, the DSP control board is vertically inserted and welded on the power board in a golden finger mode, and the power board comprises a power supply circuit, an IGBT drive circuit, a voltage / current sampling circuit, a temperature detection circuit and a fault alarm circuit. And the power board provides a 24VISO isolation power supply and + 5V and + 3.3 V system working power supplies for the DSP control board. According to the over-temperature protection circuit, the temperature of the circuit is detected, so that the over-temperature protection can be carried out in time, the over-current condition of the water pump controller can be protected, the use safety of the water pump controller is improved, and the damage risk in the use process is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of three-phase water pump controllers, and particularly relates to an intelligent three-phase water pump controller. Background Art

[0002] A three-phase water pump controller is a professional control device that realizes the automatic operation of the water pump through an electric control method. This controller can perform functions such as stroke control, pressure control, and protection control on the three-phase water pump, enabling it to adapt to different application scenarios and requirements. Since the parameters and wiring methods of three-phase water pump controllers from different manufacturers and models may vary, there are certain differences in their versatility. The workload of the three-phase water pump controllers in the prior art is relatively large, and the temperature of the circuit will rise during long-term operation. It cannot perform over-temperature protection when the temperature in the circuit is too high. Therefore, the three-phase water pump controller often has a risk of being damaged due to overheating and cannot meet the usage requirements. Considering the above situation, we have proposed an intelligent three-phase water pump controller. Summary of the Utility Model

[0003] The purpose of the utility model is to solve the deficiencies existing in the prior art and propose an intelligent three-phase water pump controller.

[0004] To achieve the above purpose, the utility model adopts the following technical scheme:

[0005] An intelligent three-phase water pump controller includes a power board and a DSP control board. The DSP control board is vertically inserted and soldered onto the power board in the form of a gold finger. The power board includes a power supply circuit, an IGBT drive circuit, a voltage / current sampling circuit, a temperature detection circuit, and a fault alarm circuit. The power board provides a 24V_ISO isolated power supply, a +5V, and a +3.3V system operating power supply for the DSP control board;

[0006] The DSP control board is provided with a 4-20mA analog input interface, a 0-10V analog input interface, two RS485 interfaces, two NPN input detection interfaces, an NPN output interface, and a PNP output interface. The RS485 interface can be connected to a display module to realize the human-machine interface interaction of the water pump controller, and at the same time, it can be connected to a PLC device for linkage control.

[0007] Preferably, the IGBT drive circuit includes a three-phase half-bridge drive chip U15 and an IGBT module U2. One end of a capacitor C56, a 15V power supply, and one end of a capacitor C1 are electrically connected to pin 3 of the three-phase half-bridge drive chip U15. The other end of the capacitor C56 and the other end of the capacitor C1 are both grounded. One end of a capacitor C47 and one end of a resistor R111 are electrically connected to pin 14 of the three-phase half-bridge drive chip U15. The other end of the capacitor C47 is grounded. The other end of the resistor R111 is electrically connected to pin 22 of the three-phase half-bridge drive chip U15. One end of a resistor R112 and one end of a resistor R47 are electrically connected to pin 15 of the three-phase half-bridge drive chip U15. The other end of the resistor R112 is electrically connected to a +3.3V voltage. One end of a resistor R113 is electrically connected to pin 16 of the three-phase half-bridge drive chip U15. The other end of the resistor R113 is electrically connected to pin 17 of the three-phase half-bridge drive chip U15. The other end of the resistor R113 is also electrically connected to one end of a resistor R138. Pin 20 of the three-phase half-bridge drive chip U15 is grounded. One end of a resistor R145B, one end of a resistor R145, one end of a resistor R146, one end of a resistor R150, and one end of a resistor R150A are electrically connected to pin 18 of the three-phase half-bridge drive chip U15;

[0008] One end of a resistor R135 is electrically connected to pin 25 of the three-phase half-bridge drive chip U15. The other end of the resistor R135 is electrically connected to the positive electrode of a diode D34 and pin 1 of a triode Q21. Pin 2 of the triode Q21 is electrically connected to the negative electrode of the diode D34. The negative electrode of the diode D34 is electrically connected to one end of a resistor R209. The other end of the resistor R209 is electrically connected to one end of a resistor R2 and one end of a capacitor C24D. The other end of the resistor R2 and the other end of the capacitor C24D are both electrically connected to pin 3 of the triode Q21. The other end of the resistor R209 is also electrically connected to pin G2 of the IGBT module U2;

[0009] One end of a resistor R143 is electrically connected to pin 24 of the three-phase half-bridge drive chip U15. The other end of the resistor R143 is electrically connected to the positive electrode of a diode D35 and pin 1 of a triode Q22. Pin 2 of the triode Q22 is electrically connected to the negative electrode of the diode D35. The negative electrode of the diode D35 is electrically connected to one end of a resistor R210. The other end of the resistor R210 is electrically connected to one end of a resistor R7 and one end of a capacitor C24E. The other end of the resistor R7 and the other end of the capacitor C24E are both electrically connected to pin 3 of the triode Q22. The other end of the resistor R210 is also electrically connected to pin G4 of the IGBT module U2;

[0010] One end of a resistor R144 is electrically connected to pin 23 of the three-phase half-bridge drive chip U15. The other end of the resistor R144 is electrically connected to the positive electrode of a diode D37 and pin 1 of a triode Q23. Pin 2 of the triode Q23 is electrically connected to the negative electrode of the diode D37. The negative electrode of the diode D37 is electrically connected to one end of a resistor R211. The other end of the resistor R211 is electrically connected to one end of a resistor R44 and one end of a capacitor C24F. The other ends of the resistor R44 and the capacitor C24F are both electrically connected to pin 3 of the triode Q23. The other end of the resistor R211 is also electrically connected to pin G6 of the IGBT module U2;

[0011] One end of a resistor R147 is electrically connected to pin 3 of the triode Q21. One end of the resistor R147 is also electrically connected to pin EU of the IGBT module U2. One end of a resistor R148 is electrically connected to pin 3 of the triode Q22. One end of the resistor R148 is also electrically connected to pin EV of the IGBT module U2. One end of a resistor R149 is electrically connected to pin 3 of the triode Q23. One end of the resistor R149 is also electrically connected to pin EW of the IGBT module U2. The other ends of the resistor R147, the resistor R148, and the resistor R149 are all electrically connected to pin 18 of the three-phase half-bridge drive chip U15.

[0012] Preferably, one end of a bootstrap capacitor E2 and the negative electrode of a diode D14 are electrically connected to pin 43 of the three-phase half-bridge drive chip U15. One end of a resistor R121 is electrically connected to the positive electrode of the diode D14. The negative electrode of a diode D21 and one end of a bootstrap capacitor E1 are electrically connected to pin 37 of the three-phase half-bridge drive chip U15. One end of a resistor R124 is electrically connected to the positive electrode of the diode D21. One end of a capacitor C45, one end of a bootstrap capacitor E4 and the negative electrode of a diode D22 are electrically connected to pin 31 of the three-phase half-bridge drive chip U15. One end of a resistor R131 is electrically connected to the positive electrode of the diode D22. The other ends of the resistor R131, the resistor R124 and the resistor R121 are all electrically connected to a 15V power supply. The negative electrode of the diode D14 is electrically connected to one end of a capacitor C25. The other end of the capacitor C25 is electrically connected to the other end of the bootstrap capacitor E2. One end of a capacitor C32 is electrically connected to one end of the bootstrap capacitor E1. The other end of the capacitor C32 is electrically connected to the other end of the bootstrap capacitor E1. The other ends of the capacitor C45 and the bootstrap capacitor E4 are both electrically connected to pin 29 of the three-phase half-bridge drive chip U15. One ends of a resistor R128, a resistor R12, a resistor R207, a resistor R20, a resistor R134 and a resistor R36 are electrically connected to pins 42, 41, 36, 35, 30 and 29 of the three-phase half-bridge drive chip U15 respectively. The other end of the resistor R128 is electrically connected to the positive electrode of a diode D27 and pin 1 of a triode Q18. The negative electrode of the diode D27 is electrically connected to one end of a resistor R201. One end of the resistor R201 is also electrically connected to pin 2 of the triode Q18. The other end of the resistor R201 is electrically connected to one end of a resistor R1. Pin 3 of the triode Q18 is electrically connected to the other end of the resistor R1. Pin 3 of the triode Q18 is also electrically connected to one end of a capacitor C24A. The other end of the capacitor C24A and the other end of the resistor R201 are both electrically connected to pin G1 of the IGBT module U2. The other end of the resistor R12 is electrically connected to pin 3 of the triode Q18;

[0013] The other end of the resistor R207 is electrically connected to the positive electrode of a diode D32 and pin 1 of a triode Q19. The negative electrode of the diode D32 is electrically connected to one end of a resistor R202. One end of the resistor R202 is also electrically connected to pin 2 of the triode Q19. The other end of the resistor R202 is electrically connected to one end of a resistor R3. Pin 3 of the triode Q19 is electrically connected to the other end of the resistor R3. Pin 3 of the triode Q19 is also electrically connected to one end of a capacitor C24B. The other end of the capacitor C24B and the other end of the resistor R202 are both electrically connected to pin G3 of the IGBT module U2. The other end of the resistor R20 is electrically connected to pin 3 of the triode Q19;

[0014] The other end of the resistor R134 is electrically connected to the positive electrode of the diode D33 and the pin 1 of the triode Q20. The negative electrode of the diode D33 is electrically connected to one end of the resistor R208. One end of the resistor R208 is also electrically connected to the pin 2 of the triode Q20. The other end of the resistor R208 is electrically connected to one end of the resistor R45. The pin 3 of the triode Q20 is electrically connected to the other end of the resistor R45. The pin 3 of the triode Q20 is also electrically connected to one end of the capacitor C24C. The other end of the capacitor C24C and the other end of the resistor R208 are both electrically connected to the pin G5 of the IGBT module U2. The other end of the resistor R36 is electrically connected to the pin 3 of the triode Q20.

[0015] Preferably, the SPWM signal of the DSP main control board is output to the pins HIN1, HIN2, HIN3, LIN1, LIN2, and LIN3 of the three-phase half-bridge drive chip U15. Among them, the signals of the pins HIN1, HIN2, and HIN3 respectively control the conduction states of the upper tubes of the three-phase electricity of the motor W, U, and V. The FAULT# pin of the three-phase half-bridge drive chip U15 is a fault output interface.

[0016] Preferably, one end of the capacitor C84 is electrically connected to the pin P1 of the IGBT module U2. One end of the resistor R43 and one end of the resistor R49 are electrically connected to the pin T1 of the IGBT module U2. The pin T2 of the IGBT module U2 is electrically connected to the other end of the resistor R49. The other end of the resistor R49 is grounded. One end of the resistor R48 and one end of the capacitor C20 are also electrically connected to the pin T1 of the IGBT module U2. The other end of the capacitor C20 is electrically connected to the pin T2 of the IGBT module U2. One end of the capacitor C48 is electrically connected to the pin T2 of the IGBT module U2. The other end of the capacitor C48 is electrically connected to the other end of the resistor R48.

[0017] Preferably, the input and output interface circuit of the DSP control board includes the chips U10, U2, U3, and U5. INT1 and INT2 are two NPN-type input detection interfaces;

[0018] One end of the resistor R3 and one end of the capacitor C19 are electrically connected to the pin 1 of the chip U10. The pin 2 of the chip U10 is electrically connected to the other end of the resistor R3 and the other end of the capacitor C19. The pin 2 of the chip U10 is electrically connected to one end of the resistor R4. The other end of the resistor R4 is electrically connected to the indicator lamp D14. One end of the resistor R59 and one end of the capacitor C29 are electrically connected to the pin 3 of the chip U10. The pin 4 of the chip U10 and the other end of the capacitor C29 are both electrically connected to the isolated power supply;

[0019] One end of a resistor R145 is electrically connected to pin 1 of the chip U2, the other end of the resistor R145 is electrically connected to a 5V isolation voltage, pin 3 of the chip U2 is electrically connected to a 24V isolation voltage, pin 4 of the chip U2 is electrically connected to one end of a resistor R146, the other end of the resistor R146 is electrically connected to one end of a resistor R148 and pin 1 of a triode Q8, and pin 3 of the triode Q8 and the other end of the resistor R148 are both electrically connected to an isolation power supply;

[0020] One end of a resistor R16 and one end of a capacitor C2 are electrically connected to pin 1 of the chip U3, the other end of the resistor R16 and the other end of the capacitor C2 are electrically connected to pin 2 of the chip U3, one end of a resistor R7 is electrically connected to pin 2 of the chip U3, the other end of the resistor R7 is electrically connected to an indicator lamp D8, one end of a resistor R15 and one end of a capacitor C3 are electrically connected to pin 3 of the chip U3, and pin 4 of the chip U3 and the other end of the capacitor C3 are both grounded;

[0021] One end of a resistor R35 is electrically connected to pin 1 of the chip U5, +3.3V voltage is electrically connected to pin 2 of the chip U5, one end of a resistor R36 is electrically connected to pin 4 of the chip U5, the other end of the resistor R36 is electrically connected to one end of a resistor R37 and pin 1 of a triode Q2, and pin 2 of the triode Q2 is electrically connected to the other end of the resistor R37.

[0022] Compared with the existing technology, the beneficial effects of the present utility model are as follows:

[0023] By detecting the temperature of the circuit, the present utility model can provide timely protection in case of overheating, and at the same time can protect against overcurrent conditions of the water pump controller, improving the use safety of the water pump controller and reducing the risk of damage during use. Description of the Drawings

[0024] Figure 1 It is a system block diagram of an intelligent three-phase water pump controller proposed by the present utility model;

[0025] Figure 2 It is a circuit diagram of an IGBT drive circuit of an intelligent three-phase water pump controller proposed by the present utility model;

[0026] Figure 3 It is a circuit diagram of an IGBT module U2 of an intelligent three-phase water pump controller proposed by the present utility model;

[0027] Figure 4 It is a circuit diagram of the connection circuit of pins 23, 24 and 25 of a three-phase half-bridge drive chip U15 of an intelligent three-phase water pump controller proposed by the present utility model;

[0028] Figure 5Circuit diagram of the connection circuit of pins 29, 30, 31, 35, 36, 37, 41, 42 and 43 of the three-phase half-bridge drive chip U15 of an intelligent three-phase water pump controller proposed by the present utility model;

[0029] Figure 6 Circuit diagram of the input and output interface circuit of the DSP control board of an intelligent three-phase water pump controller proposed by 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 of the embodiments.

[0031] Refer to Figures 1-6 , an intelligent three-phase water pump controller, including a power board and a DSP control board. The DSP control board is vertically inserted and soldered onto the power board in the form of a gold finger. The power board includes a power supply circuit, an IGBT drive circuit, a voltage / current sampling circuit, a temperature detection circuit, and a fault alarm circuit. The power board provides a 24V_ISO isolated power supply, +5V, and +3.3V system operating power supplies for the DSP control board;

[0032] Among them, the IGBT drive circuit includes a three-phase half-bridge drive chip U15 and an IGBT module U2. One end of a capacitor C56, a 15V power supply, and one end of a capacitor C1 are electrically connected to pin 3 of the three-phase half-bridge drive chip U15. The other ends of the capacitor C56 and the capacitor C1 are both grounded. One end of a capacitor C47 and one end of a resistor R111 are electrically connected to pin 14 of the three-phase half-bridge drive chip U15. The other end of the capacitor C47 is grounded. The other end of the resistor R111 is electrically connected to pin 22 of the three-phase half-bridge drive chip U15. One end of a resistor R112 and one end of a resistor R47 are electrically connected to pin 15 of the three-phase half-bridge drive chip U15. The other end of the resistor R112 is electrically connected to a +3.3V voltage. One end of a resistor R113 is electrically connected to pin 16 of the three-phase half-bridge drive chip U15. The other end of the resistor R113 is electrically connected to pin 17 of the three-phase half-bridge drive chip U15. The other end of the resistor R113 is also electrically connected to one end of a resistor R138. Pin 20 of the three-phase half-bridge drive chip U15 is grounded. One end of a resistor R145B, one end of a resistor R145, one end of a resistor R146, one end of a resistor R150, and one end of a resistor R150A are electrically connected to pin 18 of the three-phase half-bridge drive chip U15;

[0033] One end of resistor R135 is electrically connected to pin 25 of three-phase half-bridge drive chip U15. The other end of resistor R135 is electrically connected to the positive electrode of diode D34 and pin 1 of triode Q21. Pin 2 of triode Q21 is electrically connected to the negative electrode of diode D34. The negative electrode of diode D34 is electrically connected to one end of resistor R209. The other end of resistor R209 is electrically connected to one end of resistor R2 and one end of capacitor C24D. The other ends of resistor R2 and capacitor C24D are both electrically connected to pin 3 of triode Q21. The other end of resistor R209 is also electrically connected to pin G2 of IGBT module U2;

[0034] One end of resistor R143 is electrically connected to pin 24 of three-phase half-bridge drive chip U15. The other end of resistor R143 is electrically connected to the positive electrode of diode D35 and pin 1 of triode Q22. Pin 2 of triode Q22 is electrically connected to the negative electrode of diode D35. The negative electrode of diode D35 is electrically connected to one end of resistor R210. The other end of resistor R210 is electrically connected to one end of resistor R7 and one end of capacitor C24E. The other ends of resistor R7 and capacitor C24E are both electrically connected to pin 3 of triode Q22. The other end of resistor R210 is also electrically connected to pin G4 of IGBT module U2;

[0035] One end of resistor R144 is electrically connected to pin 23 of three-phase half-bridge drive chip U15. The other end of resistor R144 is electrically connected to the positive electrode of diode D37 and pin 1 of triode Q23. Pin 2 of triode Q23 is electrically connected to the negative electrode of diode D37. The negative electrode of diode D37 is electrically connected to one end of resistor R211. The other end of resistor R211 is electrically connected to one end of resistor R44 and one end of capacitor C24F. The other ends of resistor R44 and capacitor C24F are both electrically connected to pin 3 of triode Q23. The other end of resistor R211 is also electrically connected to pin G6 of IGBT module U2;

[0036] Pin 3 of triode Q21 is electrically connected to one end of resistor R147. One end of resistor R147 is also electrically connected to pin EU of IGBT module U2. Pin 3 of triode Q22 is electrically connected to one end of resistor R148. One end of resistor R148 is also electrically connected to pin EV of IGBT module U2. Pin 3 of triode Q23 is electrically connected to one end of resistor R149. One end of resistor R149 is also electrically connected to pin EW of IGBT module U2. The other ends of resistor R147, resistor R148 and resistor R149 are all electrically connected to pin 18 of three-phase half-bridge drive chip U15;

[0037] Pin 43 of the three-phase half-bridge drive chip U15 is electrically connected to one end of the bootstrap capacitor E2 and the cathode of the diode D14. The anode of the diode D14 is electrically connected to one end of the resistor R121. Pin 37 of the three-phase half-bridge drive chip U15 is electrically connected to the cathode of the diode D21 and one end of the bootstrap capacitor E1. The anode of the diode D21 is electrically connected to one end of the resistor R124. Pin 31 of the three-phase half-bridge drive chip U15 is electrically connected to one end of the capacitor C45, one end of the bootstrap capacitor E4, and the cathode of the diode D22. The anode of the diode D22 is electrically connected to one end of the resistor R131. The other ends of the resistor R131, the resistor R124, and the resistor R121 are all electrically connected to the 15V power supply. The cathode of the diode D14 is electrically connected to one end of the capacitor C25. The other end of the capacitor C25 is electrically connected to the other end of the bootstrap capacitor E2. One end of the bootstrap capacitor E1 is electrically connected to one end of the capacitor C32. The other end of the capacitor C32 is electrically connected to the other end of the bootstrap capacitor E1. The other end of the capacitor C45 and the other end of the bootstrap capacitor E4 are both electrically connected to pin 29 of the three-phase half-bridge drive chip U15. Pins 42, 41, 36, 35, 30, and 29 of the three-phase half-bridge drive chip U15 are electrically connected to one end of the resistor R128, one end of the resistor R12, one end of the resistor R207, one end of the resistor R20, one end of the resistor R134, and one end of the resistor R36 respectively. The other end of the resistor R128 is electrically connected to the anode of the diode D27 and pin 1 of the triode Q18. The cathode of the diode D27 is electrically connected to one end of the resistor R201. One end of the resistor R201 is also electrically connected to pin 2 of the triode Q18. The other end of the resistor R201 is electrically connected to one end of the resistor R1. Pin 3 of the triode Q18 is electrically connected to the other end of the resistor R1. Pin 3 of the triode Q18 is also electrically connected to one end of the capacitor C24A. The other end of the capacitor C24A and the other end of the resistor R201 are both electrically connected to pin G1 of the IGBT module U2. The other end of the resistor R12 is electrically connected to pin 3 of the triode Q18;

[0038] The other end of the resistor R207 is electrically connected to the anode of the diode D32 and pin 1 of the triode Q19. The cathode of the diode D32 is electrically connected to one end of the resistor R202. One end of the resistor R202 is also electrically connected to pin 2 of the triode Q19. The other end of the resistor R202 is electrically connected to one end of the resistor R3. Pin 3 of the triode Q19 is electrically connected to the other end of the resistor R3. Pin 3 of the triode Q19 is also electrically connected to one end of the capacitor C24B. The other end of the capacitor C24B and the other end of the resistor R202 are both electrically connected to pin G3 of the IGBT module U2. The other end of the resistor R20 is electrically connected to pin 3 of the triode Q19;

[0039] The other end of resistor R134 is electrically connected to the positive electrode of diode D33 and pin 1 of triode Q20. The negative electrode of diode D33 is electrically connected to one end of resistor R208. One end of resistor R208 is also electrically connected to pin 2 of triode Q20. The other end of resistor R208 is electrically connected to one end of resistor R45. Pin 3 of triode Q20 is electrically connected to the other end of resistor R45. Pin 3 of triode Q20 is also electrically connected to one end of capacitor C24C. The other end of capacitor C24C and the other end of resistor R208 are both electrically connected to pin G5 of IGBT module U2. The other end of resistor R36 is electrically connected to pin 3 of triode Q20;

[0040] The DSP control board is provided with a 4-20mA analog input interface, a 0-10V analog input interface, two RS485 interfaces, two NPN input detection interfaces, an NPN output interface, and a PNP output interface. The RS485 interface can be connected to a display module to realize the human-machine interface interaction of the water pump controller, and at the same time, it can be connected to a PLC device for linkage control. Among them, the SPWM signal of the DSP main control board is output to pins HIN1, HIN2, HIN3, LIN1, LIN2, and LIN3 of the three-phase half-bridge drive chip U15. Among them, the signals of pins HIN1, HIN2, and HIN3 respectively control the conduction states of the upper tubes of the three-phase electricity of the motor W, U, and V. The FAULT# pin of the three-phase half-bridge drive chip U15 is a fault output interface;

[0041] One end of capacitor C84 is electrically connected to pin P1 of IGBT module U2. One end of resistor R43 and one end of resistor R49 are electrically connected to pin T1 of IGBT module U2. Pin T2 of IGBT module U2 is electrically connected to the other end of resistor R49. The other end of resistor R49 is grounded. One end of resistor R48 and one end of capacitor C20 are also electrically connected to pin T1 of IGBT module U2. The other end of capacitor C20 is electrically connected to pin T2 of IGBT module U2. One end of capacitor C48 is electrically connected to pin T2 of IGBT module U2. The other end of capacitor C48 is electrically connected to the other end of resistor R48;

[0042] The input and output interface circuit of the DSP control board includes chip U10, chip U2, chip U3, and chip U5. INT1 and INT2 are two NPN-type input detection interfaces. Among them, NT1 and INT2 are two NPN-type input detection interfaces. When the input is at a low level, indicator D14 and indicator D8 light up. The two inputs are input to the IO port of the MCU after passing through the isolation optocoupler of chip U10 and chip U3. MCU_CTL1 controls the NPN-type output signal OUT1 after passing through the isolation optocoupler chip U2. When the control signal MCU_CTL1 is at a low level, it controls the output signal OUT1 to output a low level. MCU_CTL2 controls the PNP-type output signal OUT2 after passing through the isolation optocoupler chip U5. When the control signal MCU_CTL2 is at a low level, it controls the output signal OUT2 to output a 24V voltage.

[0043] One end of resistor R3 and one end of capacitor C19 are electrically connected to pin 1 of chip U10. The other end of resistor R3 and the other end of capacitor C19 are electrically connected to pin 2 of chip U10. One end of resistor R4 is electrically connected to pin 2 of chip U10. The other end of resistor R4 is electrically connected to indicator D14. One end of resistor R59 and one end of capacitor C29 are electrically connected to pin 3 of chip U10. Pin 4 of chip U10 and the other end of capacitor C29 are both electrically connected to the isolated power supply.

[0044] One end of resistor R145 is electrically connected to pin 1 of chip U2. The other end of resistor R145 is electrically connected to the 5V isolated voltage. The 24V isolated voltage is electrically connected to pin 3 of chip U2. One end of resistor R146 is electrically connected to pin 4 of chip U2. The other end of resistor R146 is electrically connected to one end of resistor R148 and pin 1 of triode Q8. Pin 3 of triode Q8 and the other end of resistor R148 are both electrically connected to the isolated power supply.

[0045] One end of resistor R16 and one end of capacitor C2 are electrically connected to pin 1 of chip U3. The other end of resistor R16 and the other end of capacitor C2 are electrically connected to pin 2 of chip U3. One end of resistor R7 is electrically connected to pin 2 of chip U3. The other end of resistor R7 is electrically connected to indicator D8. One end of resistor R15 and one end of capacitor C3 are electrically connected to pin 3 of chip U3. Pin 4 of chip U3 and the other end of capacitor C3 are both grounded.

[0046] Pin 1 of chip U5 is electrically connected to one end of resistor R35, pin 2 of chip U5 is electrically connected to a +3.3V voltage, pin 4 of chip U5 is electrically connected to one end of resistor R36, the other end of resistor R36 is electrically connected to one end of resistor R37 and pin 1 of transistor Q2, and pin 2 of transistor Q2 is electrically connected to the other end of resistor R37; the utility model can detect the temperature of the circuit and provide timely protection in case of overtemperature, and can also protect the water pump controller against overcurrent, thereby improving the safety of the water pump controller and reducing the risk of damage during use.

[0047] Working principle: When in use, the DSP control board is vertically soldered to the power board in the form of gold fingers. The power board provides 24V_ISO isolated power supply and +5V, +3.3V system working power supply for the DSP control board; the DSP control board drives the IGBT drive circuit on the power board by outputting SPWM signals. At the same time, the voltage / current sampling circuit on the power board feeds back analog sampling signals to the DSP control board for ADC sampling conversion by the DSP chip, thereby realizing vector control of the water pump motor. The temperature detection circuit feeds back analog temperature data signals to the DSP control board in real time for sampling conversion, which can monitor the temperature in real time to realize the function of over-temperature protection;

[0048] When the water pump motor is running with overcurrent, the fault alarm circuit of the power board will generate an alarm signal to the DSP main control board. The DSP chip can detect the corresponding IO port signal to achieve fault alarm response to prevent the fault from damaging the motor and controller. At the same time, after the fault alarm is released, the DSP chip can control the corresponding IO port to output a fault clear signal to the power board to restore the power board to normal working state.

[0049] At the same time, the three-phase half-bridge driver chip U15 is powered by a 15V voltage generated by the power supply circuit, and the SPWM signal of the DSP main control board is output to the HIN1, HIN2, HIN3, LIN1, LIN2, and LIN3 pins of the three-phase half-bridge driver chip U15. LIN1, LIN2, and LIN3 control the conduction state of the three-phase power tubes W, U, and V of the motor respectively; when the 15V power supply voltage of the three-phase half-bridge driver chip U15 is abnormal, or an overcurrent occurs, a fault signal will be output to the corresponding IO of the DSP main control board The overcurrent value can be set by changing the resistance value of resistors R145B, R145, R146, R150 and R150A in parallel. After the fault alarm signal is generated, the DSP main control board needs to output a low-level signal to the FLT-CLR# pin of the three-phase half-bridge driver chip U15 through resistor R47 to clear the fault signal. Only then can the three-phase half-bridge driver chip U15 continue to work normally. This mechanism can conveniently protect the water pump controller and motor from damage caused by overcurrent.

[0050] The voltages across resistor R147, resistor R148, and resistor R149 are amplified by the current sampling circuit and then output to the DSP main control board for ADC sampling. Through the temperature detection circuit composed of resistor R43, resistor R49, resistor R48, capacitor C20, and capacitor C48, the internal temperature data of the IGBT module U2 is fed back to the ADC detection port of the DSP main control board in real time, enabling over-temperature protection for the IGBT module U2. By providing over-temperature and over-current protection for the circuit, the safety of use of the three-phase water pump controller is improved.

[0051] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes should be covered within the protection scope of the present invention.

Claims

1. An intelligent three-phase water pump controller, comprising a power board and a DSP control board, wherein the DSP control board is vertically soldered to the power board in the form of a gold finger, characterized in that: The power board includes a power supply circuit, an IGBT drive circuit, a voltage / current sampling circuit, a temperature detection circuit and a fault alarm circuit. The power board provides a 24V_ISO isolated power supply and +5V and +3.3V system working power supplies for the DSP control board; The DSP control board is provided with a 4-20mA analog input interface, a 0-10V analog input interface, two RS485 interfaces, two NPN input detection interfaces, an NPN output interface and a PNP output interface. The RS485 interface can be connected to the display module to realize the human-machine interface interaction of the water pump controller, and can also be connected to the PLC device for linkage control.

2. The intelligent three-phase water pump controller according to claim 1, characterized in that: The IGBT drive circuit includes a three-phase half-bridge drive chip U15 and an IGBT module U2. Pin 3 of the three-phase half-bridge drive chip U15 is electrically connected to one end of a capacitor C56, a 15V power supply and one end of a capacitor C1. The other end of the capacitor C56 and the other end of the capacitor C1 are both grounded. Pin 14 of the three-phase half-bridge drive chip U15 is electrically connected to one end of a capacitor C47 and one end of a resistor R111. The other end of the capacitor C47 is grounded. The other end of the resistor R111 is electrically connected to pin 22 of the three-phase half-bridge drive chip U15. Pin 15 of the three-phase half-bridge drive chip U15 is electrically connected to one end of a resistor R112. and one end of the resistor R47, the other end of the resistor R112 is electrically connected to a +3.3V voltage, the pin 16 of the three-phase half-bridge driver chip U15 is electrically connected to one end of the resistor R113, the other end of the resistor R113 is electrically connected to the pin 17 of the three-phase half-bridge driver chip U15, the other end of the resistor R113 is also electrically connected to one end of the resistor R138, the pin 20 of the three-phase half-bridge driver chip U15 is grounded, and the pin 18 of the three-phase half-bridge driver chip U15 is electrically connected to one end of the resistor R145B, one end of the resistor R145, one end of the resistor R146, one end of the resistor R150 and one end of the resistor R150A; Pin 25 of the three-phase half-bridge driver chip U15 is electrically connected to one end of a resistor R135, the other end of the resistor R135 is electrically connected to the positive electrode of a diode D34 and pin 1 of a transistor Q21, pin 2 of the transistor Q21 is electrically connected to the negative electrode of the diode D34, the negative electrode of the diode D34 is electrically connected to one end of a resistor R209, the other end of the resistor R209 is electrically connected to one end of a resistor R2 and one end of a capacitor C24D, the other end of the resistor R2 and the other end of the capacitor C24D are both electrically connected to pin 3 of the transistor Q21, and the other end of the resistor R209 is also electrically connected to pin G2 of the IGBT module U2; Pin 24 of the three-phase half-bridge driver chip U15 is electrically connected to one end of a resistor R143, the other end of the resistor R143 is electrically connected to the positive electrode of a diode D35 and pin 1 of a transistor Q22, pin 2 of the transistor Q22 is electrically connected to the negative electrode of the diode D35, the negative electrode of the diode D35 is electrically connected to one end of a resistor R210, the other end of the resistor R210 is electrically connected to one end of a resistor R7 and one end of a capacitor C24E, the other end of the resistor R7 and the other end of the capacitor C24E are both electrically connected to pin 3 of the transistor Q22, and the other end of the resistor R210 is also electrically connected to pin G4 of the IGBT module U2; Pin 23 of the three-phase half-bridge driver chip U15 is electrically connected to one end of a resistor R144, the other end of the resistor R144 is electrically connected to the positive electrode of a diode D37 and pin 1 of a transistor Q23, pin 2 of the transistor Q23 is electrically connected to the negative electrode of the diode D37, the negative electrode of the diode D37 is electrically connected to one end of a resistor R211, the other end of the resistor R211 is electrically connected to one end of a resistor R44 and one end of a capacitor C24F, the other end of the resistor R44 and the other end of the capacitor C24F are both electrically connected to pin 3 of the transistor Q23, and the other end of the resistor R211 is also electrically connected to pin G6 of the IGBT module U2; Pin 3 of the transistor Q21 is electrically connected to one end of a resistor R147, and one end of the resistor R147 is also electrically connected to pin EU of the IGBT module U2. Pin 3 of the transistor Q22 is electrically connected to one end of a resistor R148, and one end of the resistor R148 is also electrically connected to pin EV of the IGBT module U2. Pin 3 of the transistor Q23 is electrically connected to one end of a resistor R149, and one end of the resistor R149 is also electrically connected to pin EW of the IGBT module U2. The other end of the resistor R147, the other end of the resistor R148 and the other end of the resistor R149 are all electrically connected to pin 18 of the three-phase half-bridge driver chip U15.

3. An intelligent three-phase water pump controller according to claim 2, characterized in that: The pin 43 of the three-phase half-bridge driver chip U15 is electrically connected to one end of the bootstrap capacitor E2 and the cathode of the diode D14, the anode of the diode D14 is electrically connected to one end of the resistor R121, the pin 37 of the three-phase half-bridge driver chip U15 is electrically connected to the cathode of the diode D21 and one end of the bootstrap capacitor E1, the anode of the diode D21 is electrically connected to one end of the resistor R124, the pin 31 of the three-phase half-bridge driver chip U15 is electrically connected to one end of the capacitor C45, one end of the bootstrap capacitor E4 and the cathode of the diode D22. The cathode of the diode D22 is electrically connected to one end of the resistor R131, the other end of the resistor R131, the other end of the resistor R124 and the other end of the resistor R121 are all electrically connected to a 15V power supply, the cathode of the diode D14 is electrically connected to one end of the capacitor C25, the other end of the capacitor C25 is electrically connected to the other end of the bootstrap capacitor E2, one end of the bootstrap capacitor E1 is electrically connected to one end of the capacitor C32, the other end of the capacitor C32 is electrically connected to the other end of the bootstrap capacitor E1, and the other end of the capacitor C45 is electrically connected to the bootstrap capacitor E2. The other end of capacitor E4 is electrically connected to pin 29 of the three-phase half-bridge driver chip U15, and pins 42, 41, 36, 35, 30 and 29 of the three-phase half-bridge driver chip U15 are electrically connected to one end of resistor R128, one end of resistor R12, one end of resistor R207, one end of resistor R20, one end of resistor R134 and one end of resistor R36 respectively. The other end of resistor R128 is electrically connected to the positive electrode of diode D27 and pin 1 of transistor Q18, and the negative electrode of diode D27 is electrically connected to the positive electrode of diode D27. One end of the resistor R201 is electrically connected, one end of the resistor R201 is also electrically connected to the pin 2 of the transistor Q18, the other end of the resistor R201 is electrically connected to one end of the resistor R1, the pin 3 of the transistor Q18 is electrically connected to the other end of the resistor R1, the pin 3 of the transistor Q18 is also electrically connected to one end of the capacitor C24A, the other end of the capacitor C24A and the other end of the resistor R201 are both electrically connected to the pin G1 of the IGBT module U2, and the other end of the resistor R12 is electrically connected to the pin 3 of the transistor Q18; The other end of the resistor R207 is electrically connected to the positive electrode of the diode D32 and the pin 1 of the transistor Q19, the negative electrode of the diode D32 is electrically connected to one end of the resistor R202, one end of the resistor R202 is also electrically connected to the pin 2 of the transistor Q19, the other end of the resistor R202 is electrically connected to one end of the resistor R3, the pin 3 of the transistor Q19 is electrically connected to the other end of the resistor R3, the pin 3 of the transistor Q19 is also electrically connected to one end of the capacitor C24B, the other end of the capacitor C24B and the other end of the resistor R202 are both electrically connected to the pin G3 of the IGBT module U2, and the other end of the resistor R20 is electrically connected to the pin 3 of the transistor Q19; The other end of the resistor R134 is electrically connected to the positive electrode of the diode D33 and the pin 1 of the transistor Q20, the negative electrode of the diode D33 is electrically connected to one end of the resistor R208, one end of the resistor R208 is also electrically connected to the pin 2 of the transistor Q20, the other end of the resistor R208 is electrically connected to one end of the resistor R45, the pin 3 of the transistor Q20 is electrically connected to the other end of the resistor R45, the pin 3 of the transistor Q20 is also electrically connected to one end of the capacitor C24C, the other end of the capacitor C24C and the other end of the resistor R208 are both electrically connected to the pin G5 of the IGBT module U2, and the other end of the resistor R36 is electrically connected to the pin 3 of the transistor Q20.

4. The intelligent three-phase water pump controller according to claim 1, characterized in that: The SPWM signal of the DSP main control board is output to the HIN1, HIN2, HIN3, LIN1, LIN2 and LIN3 pins of the three-phase half-bridge driver chip U15, wherein the HIN1, HIN2 and HIN3 pin signals respectively control the conduction state of the three-phase power tubes of the motor W, U and V, and the FAULT# pin of the three-phase half-bridge driver chip U15 is a fault output interface.

5. The intelligent three-phase water pump controller according to claim 2, characterized in that: Pin P1 of the IGBT module U2 is electrically connected to one end of capacitor C84, pin T1 of the IGBT module U2 is electrically connected to one end of resistor R43 and one end of resistor R49, pin T2 of the IGBT module U2 is electrically linked to the other end of resistor R49, the other end of resistor R49 is grounded, pin T1 of the IGBT module U2 is also electrically connected to one end of resistor R48 and one end of capacitor C20, the other end of capacitor C20 is electrically connected to pin T2 of the IGBT module U2, pin T2 of the IGBT module U2 is electrically connected to one end of capacitor C48, the other end of capacitor C48 is electrically connected to the other end of resistor R48.

6. The intelligent three-phase water pump controller according to claim 1, characterized in that: The input and output interface circuit of the DSP control board includes chip U10, chip U2, chip U3 and chip U5, INT1 and INT2 are two NPN input detection interfaces; Pin 1 of the chip U10 is electrically connected to one end of a resistor R3 and one end of a capacitor C19, pin 2 of the chip U10 is electrically connected to the other end of the resistor R3 and the other end of the capacitor C19, pin 2 of the chip U10 is electrically connected to one end of a resistor R4, the other end of the resistor R4 is electrically connected to an indicator light D14, pin 3 of the chip U10 is electrically connected to one end of a resistor R59 and one end of a capacitor C29, and pin 4 of the chip U10 and the other end of the capacitor C29 are electrically connected to an isolated power supply; Pin 1 of the chip U2 is electrically connected to one end of a resistor R145, the other end of the resistor R145 is electrically connected to a 5V isolation voltage, pin 3 of the chip U2 is electrically connected to a 24V isolation voltage, pin 4 of the chip U2 is electrically connected to one end of a resistor R146, the other end of the resistor R146 is electrically connected to one end of a resistor R148 and pin 1 of a transistor Q8, and pin 3 of the transistor Q8 and the other end of the resistor R148 are both electrically connected to an isolated power supply; Pin 1 of the chip U3 is electrically connected to one end of a resistor R16 and one end of a capacitor C2, pin 2 of the chip U3 is electrically connected to the other end of the resistor R16 and the other end of the capacitor C2, pin 2 of the chip U3 is electrically connected to one end of a resistor R7, the other end of the resistor R7 is electrically connected to an indicator light D8, pin 3 of the chip U3 is electrically connected to one end of a resistor R15 and one end of a capacitor C3, and pin 4 of the chip U3 and the other end of the capacitor C3 are both grounded; Pin 1 of the chip U5 is electrically connected to one end of the resistor R35, pin 2 of the chip U5 is electrically connected to a +3.3V voltage, pin 4 of the chip U5 is electrically connected to one end of the resistor R36, the other end of the resistor R36 is electrically connected to one end of the resistor R37 and pin 1 of the transistor Q2, and pin 2 of the transistor Q2 is electrically connected to the other end of the resistor R37.

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