A high-voltage non-isolated motor drive control circuit

Abstract

The utility model discloses a high pressure non - isolation motor drive control circuit belongs to control circuit technical field. AC DC rectifier circuit is connected with motor power inverter control circuit, DC DC BUCK voltage reducing circuit and bus voltage detection respectively, DC DC BUCK voltage reducing circuit still is connected with 12V 5V voltage reducing circuit and motor power inverter control circuit respectively, 12V 5V voltage reducing circuit still is connected with main control MCU, main control MCU still is connected with bus voltage detection, pre - drive control circuit and photo - coupling control circuit respectively, pre - drive control circuit still is connected with motor power inverter control circuit. The utility model is used to solve the problem that the shielded pole motor operation speed is low and fluctuation is big, is greatly influenced by input voltage and frequency, and the compatibility is poor, and the work efficiency is low, and the electromagnetic noise is big, and the speed is inconvenient to adjust, and can not be positive and negative rotation control.

Description

Technical Field

[0001] This utility model belongs to the field of control circuit technology, specifically relating to a high-voltage non-isolated motor drive control circuit. Background Technology

[0002] Currently, most kitchen appliances on the market, such as ovens, microwave ovens, and air fryers, use shaded-pole motors in their cavities. These motors drive fan blades to heat the air in the mixing chamber, thus baking the food. However, shaded-pole motors have low and fluctuating operating speeds, are greatly affected by input voltage and frequency, have poor compatibility, low efficiency, high electromagnetic noise, are inconvenient for speed adjustment, cannot be controlled in forward or reverse rotation, and cannot meet the requirements of intelligent control. Therefore, this invention provides a high-voltage non-isolated motor drive control circuit to solve the above problems. Utility Model Content

[0003] This utility model provides a high-voltage non-isolated motor drive control circuit to solve the problems of shaded pole motors, such as low and fluctuating operating speed, large influence from input voltage and frequency, poor compatibility, low working efficiency, high electromagnetic noise, inconvenient speed adjustment, and inability to control forward and reverse rotation.

[0004] This utility model is achieved through the following technical solution:

[0005] A high-voltage non-isolated motor drive control circuit includes an AC-DC rectifier circuit, a pre-drive control circuit, a motor power inverter control circuit, a bus voltage detection circuit, a DC-DC BUCK step-down circuit, a 12V-5V step-down circuit, a main control MCU, and an optocoupler control circuit.

[0006] The AC-DC rectifier circuit is connected to the motor power inverter control circuit, the DC-DC BUCK step-down circuit, and the bus voltage detection circuit, respectively. The DC-DC BUCK step-down circuit is also connected to the 12V-5V step-down circuit and the motor power inverter control circuit, respectively. The 12V-5V step-down circuit is also connected to the main control MCU, and the main control MCU is also connected to the bus voltage detection circuit, the pre-drive control circuit, and the optocoupler control circuit, respectively. The pre-drive control circuit is also connected to the motor power inverter control circuit.

[0007] Furthermore, the main control MCU includes a chip U2, with terminal 1 of the chip U2 connected to one end of capacitor C5 and the operating voltage 5V, and the other end of capacitor C5 grounded.

[0008] Terminal 2 of the chip U2 is connected to the bus voltage detection circuit;

[0009] Terminals 3, 5, 21, and 22 of chip U2 are all connected to the operational amplifier detection circuit.

[0010] Terminal 4 of the chip U2 is connected to the overcurrent detection bias circuit;

[0011] Terminals 8, 9, 10, 11, 12, and 13 of chip U2 are all connected to the pre-drive control circuit.

[0012] Terminal 14 of chip U2 is connected to terminal 3 of MCU programming port JP7; terminal 15 of chip U2 is connected to terminal 2 of MCU programming port JP7; terminal 1 of MCU programming port JP7 is grounded; and terminal 4 of MCU programming port JP7 is connected to the working voltage 5V.

[0013] Both pin 18 and pin 19 of chip U2 are connected to the optocoupler control circuit.

[0014] Terminal 23 of chip U2 is connected to one end of capacitor C8 and one end of resistor R19. The other end of capacitor C8 is conveniently connected to terminal 24 of chip U2 and the ground terminal. The other end of resistor R19 is connected to the operating voltage of 5V.

[0015] Furthermore, the bus voltage detection circuit includes a capacitor C11. One end of the capacitor C11 is connected to terminal 2 of the chip U2 and one end of the resistor R20, respectively. The other end of the capacitor C11 is grounded. The other end of the resistor R20 is connected to one end of the resistor R24 ​​and one end of the resistor R11, respectively. The other end of the resistor R24 ​​is grounded. The other end of the resistor R11 is connected to one end of the resistor R10. The other end of the resistor R11 is connected to the +310V voltage line.

[0016] Furthermore, the DC-DC BUCK step-down circuit includes a chip IC2, with terminal 4 of the chip IC2 connected to the +310V voltage line, terminal 1 of the chip IC2 connected to one end of a capacitor C1, and the other end of the capacitor C1 connected to terminals 5, 6, and 7 of the chip IC2 respectively.

[0017] Terminal 2 of chip IC2 is connected to one end of resistor R2, one end of capacitor CE1, and the cathode of diode D1. Terminal 8 of chip IC2 is connected to the other end of resistor R2, the other end of capacitor CE1, the cathode of diode D5, and one end of inductor L1. The other end of inductor L1 is connected to the anode of diode D1, one end of capacitor CE2, the cathode of Zener diode ZD1, one end of resistor R7, and the operating voltage +12V. The anode of diode D5 is connected to the other end of capacitor CE2, the anode of Zener diode ZD1, and the other end of resistor R7, and then grounded.

[0018] Furthermore, the 12V-5V step-down circuit includes a chip IC1. Terminal 3 of the chip IC1 is connected to the working voltage +12V and one end of capacitor C3. The other end of capacitor C3 is connected to one end of capacitor C2 and terminal 2 of the chip IC1 and then grounded. The other end of capacitor C2 is connected to terminal 1 of the chip IC1 and the working voltage +5V.

[0019] Furthermore, the operational amplifier detection circuit includes resistors R28 and R26. One end of resistor R28 is connected to terminal 3 of chip U2 and one end of capacitor C10, respectively. The other end of capacitor C10 is connected to one end of resistor R25 and terminal 5 of chip U2, respectively.

[0020] One end of the resistor R26 is connected to terminal 22 of the chip U2 and one end of the capacitor C32, respectively; the other end of the capacitor C32 is connected to one end of the resistor R16 and one end of the chip U2.

[0021] The overcurrent detection bias circuit includes a resistor R12. One end of the resistor R12 is connected to terminal 4 of chip U2, one end of resistor R13, one end of resistor R18, and one end of capacitor C19. The other end of the resistor R12 is connected to the other ends of resistor R28 and resistor R26. The other end of the resistor R18 is connected to the operating voltage +5V. The other ends of the resistor R13 and capacitor C19 are both grounded.

[0022] Furthermore, the pre-drive control circuit includes chip U6, chip U7, and chip U9. Terminal 2 of chip U6 is connected to terminal 11 of chip U2 through resistor R33. Terminal 3 of chip U6 is connected to terminal 8 of chip U2 through resistor R35. Terminal 1 of chip U6 is connected to the operating voltage +12V and one end of capacitor C21. The other end of capacitor C21 is connected to terminal 4 of chip U6 and then grounded.

[0023] Terminal 8 of chip U6 is connected to one end of capacitor C15 and the negative terminal of diode D4. The positive terminal of diode D4 is connected to one end of resistor R23. The other end of resistor R23 is connected to the other end of resistor R21, the other end of resistor R14, and one end of capacitor C9, which is connected to the working voltage 12V. The other end of capacitor C9 is grounded.

[0024] Terminal 2 of chip U7 is connected to terminal 12 of chip U2 via resistor R39. Terminal 3 of chip U7 is connected to terminal 9 of chip U2 via resistor R40. Terminal 1 of chip U7 is connected to the operating voltage +12V and one end of capacitor C23. The other end of capacitor C23 is connected to terminal 4 of chip U7 and then grounded.

[0025] Terminal 8 of chip U7 is connected to one end of capacitor C22 and the negative terminal of diode D3, and the positive terminal of diode D3 is connected to one end of resistor R21.

[0026] Terminal 2 of chip U9 is connected to terminal 11 of chip U2 via resistor R43. Terminal 3 of chip U9 is connected to terminal 8 of chip U2 via resistor R45. Terminal 1 of chip U9 is connected to the operating voltage +12V and one end of capacitor C29. The other end of capacitor C29 is connected to terminal 4 of chip U9 and then grounded.

[0027] Terminal 8 of chip U9 is connected to one end of capacitor C26 and the negative terminal of diode D2, and the positive terminal of diode D2 is connected to one end of resistor R14.

[0028] Furthermore, the motor power inverter control circuit includes resistors R15, R22, R34, R37, R41, and R44; one end of resistor R15 is connected to terminal 7 of chip U6, and the other end of resistor R15 is connected to one end of resistor R17 and terminal 1 of MOSFET Q2; the other end of resistor R17 is connected to terminal 3 of MOSFET Q2, terminal 6 of chip U6, terminal 2 of MOSFET Q3, one end of capacitor C6, one end of capacitor C13, and terminal 1 of inductor L3.

[0029] Terminal 2 of the field-effect transistor Q2 is connected to a voltage of +310V, terminal 2 of the field-effect transistor Q4, terminal 2 of the field-effect transistor Q6, the other end of capacitor C6, one end of capacitor C17, and one end of capacitor C24.

[0030] One end of resistor R22 is connected to terminal 5 of chip U6, and the other end of resistor R22 is connected to one end of resistor R32 and terminal 1 of field-effect transistor Q3. The other end of resistor R32 is connected to terminal 3 of field-effect transistor Q2, the other end of capacitor C13, and one end of resistor RS1.

[0031] One end of resistor R34 is connected to terminal 7 of chip U7. The other end of resistor R34 is connected to one end of resistor R36 and terminal 1 of field-effect transistor Q4. The other end of resistor R36 is connected to terminal 3 of field-effect transistor Q4, terminal 6 of chip U7, terminal 2 of field-effect transistor Q5, the other end of capacitor C17, one end of capacitor C18, and terminal 2 of inductor L3.

[0032] One end of resistor R37 is connected to terminal 5 of chip U7. The other end of resistor R37 is connected to one end of resistor R38 and terminal 1 of MOSFET Q5. The other end of resistor R38 is connected to terminal 3 of MOSFET Q5 and one end of resistor RS2. The other end of resistor RS2 is connected to the other end of resistor RS1 and one end of resistor RS3.

[0033] One end of resistor R41 is connected to terminal 7 of chip U9, and the other end of resistor R41 is connected to one end of resistor R42 and terminal 1 of field-effect transistor Q6. The other end of resistor R42 is connected to terminal 3 of field-effect transistor Q6, terminal 2 of field-effect transistor Q7, terminal 6 of chip U9, and terminal 3 of inductor L3.

[0034] The other end of capacitor C24 is connected to one end of capacitor C27;

[0035] One end of resistor R44 is connected to terminal 5 of chip U9. The other end of resistor R44 is connected to one end of resistor R46 and terminal 1 of MOSFET Q7. The other end of resistor R46 is connected to terminal 3 of MOSFET Q7, the other end of capacitor C27, and one end of resistor RS3. The other end of resistor RS3 is grounded.

[0036] Furthermore, the AC-DC rectifier circuit includes a socket CN1, with terminal 1 of the socket CN1 grounded, terminal 2 of the socket CN1 connected to one end of a fuse F1, the other end of the fuse F1 connected to one end of a resistor MOV1 and one end of a resistor THR1, the other end of a resistor THR1 connected to one end of a resistor R9, one end of a capacitor CX1 and terminal 1 of an inductor T1, and the other end of a resistor R8 connected to the other end of a resistor R9.

[0037] Terminal 3 of the connector CN1 is connected to the other end of resistor MOV1, one end of resistor R8, the other end of capacitor CX1, and terminal 4 of inductor T1.

[0038] Terminal 2 of inductor T1 is connected to one end of capacitor CX2 and terminal 3 of chip BD1. Terminal 3 of inductor T1 is connected to the other end of capacitor CX2 and terminal 2 of chip BD1. Terminal 1 of chip BD1 is connected to +310V voltage, the positive terminal of capacitor EC1, one end of capacitor CBB1, and one end of capacitor CY1. Terminal 4 of chip BD1 is connected to the negative terminal of capacitor EC1, the other end of capacitor CBB1, and one end of capacitor CY2. The other end of capacitor CY1 is connected to the other end of capacitor CY2 and PE1.

[0039] Furthermore, the optocoupler control circuit includes optocoupler chip U5 and optocoupler chip U1. One end of optocoupler chip U5 is connected to terminal 18 of chip U2 and one end of resistor R6, respectively. The other end of resistor R6 is grounded. The other end of optocoupler chip U5 provides PWM signal to the main control MCU through resistor R5.

[0040] One end of the optocoupler chip U1 is connected to the operating voltage +5V through resistor R3. The other end of the optocoupler chip U1 is connected to terminal 19 of chip U2. The third end of the optocoupler chip U1 is conveniently connected to terminal FG and one end of resistor R4. The other end of resistor R4 is grounded.

[0041] The beneficial effects of this utility model are:

[0042] The control circuit and motor of this utility model are variable frequency motors, which have high starting torque, high working efficiency, stable motor operation due to software closed-loop control, low electromagnetic noise, global applicability, convenient speed adjustment, automatic direction switching, improved baking quality of food, and real-time feedback of motor working status, thus enhancing product safety and reliability. Attached Figure Description

[0043] Figure 1 This is a block diagram of the present invention.

[0044] Figure 2 This is the circuit diagram of the main control MCU of this utility model.

[0045] Figure 3 This is the circuit diagram of the MCU programming port of this utility model.

[0046] Figure 4 This is a circuit diagram for bus voltage detection of this utility model.

[0047] Figure 5This is the DC-DC BUCK step-down circuit diagram of this utility model.

[0048] Figure 6 This is the 12V-5V step-down circuit diagram of this utility model.

[0049] Figure 7 This is the circuit diagram of the operational amplifier detection circuit of this utility model.

[0050] Figure 8 This is the circuit diagram of the pre-drive control circuit of this utility model.

[0051] Figure 9 This is the circuit diagram of the motor power inverter control of this utility model.

[0052] Figure 10 This is the AC-DC rectifier circuit diagram of this utility model.

[0053] Figure 11 This is the circuit diagram of the optocoupler control of this utility model.

[0054] Figure 12 This is the overcurrent detection bias circuit diagram of this utility model. Detailed Implementation

[0055] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods are omitted so as not to obscure the description of this application with unnecessary detail.

[0056] It should be understood that, when used in this specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0057] It should also be understood that the terminology used in this application specification is for the purpose of describing particular embodiments only and is not intended to limit the application. As used in this application specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0058] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0059] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0060] This embodiment provides a high-voltage non-isolated motor drive control circuit, such as... Figure 1 As shown, the circuit includes an AC-DC rectifier circuit, a pre-drive control circuit, a motor power inverter control circuit, a bus voltage detection circuit, a DC-DC BUCK step-down circuit, a 12V-5V step-down circuit, a main control MCU, and an optocoupler control circuit.

[0061] The AC-DC rectifier circuit is connected to the motor power inverter control circuit, the DC-DC BUCK step-down circuit, and the bus voltage detection circuit, respectively. The DC-DC BUCK step-down circuit is also connected to the 12V-5V step-down circuit and the motor power inverter control circuit, respectively. The 12V-5V step-down circuit is also connected to the main control MCU, and the main control MCU is also connected to the bus voltage detection circuit, the pre-drive control circuit, and the optocoupler control circuit, respectively. The pre-drive control circuit is also connected to the motor power inverter control circuit.

[0062] Furthermore, such as Figure 2 As shown, the main control MCU includes a chip U2. Terminal 1 of the chip U2 is connected to one end of capacitor C5 and the operating voltage 5V, respectively, and the other end of capacitor C5 is grounded.

[0063] Terminal 2 of the chip U2 is connected to the bus voltage detection circuit;

[0064] Terminals 3, 5, 21, and 22 of chip U2 are all connected to the operational amplifier detection circuit.

[0065] Terminal 4 of the chip U2 is connected to the overcurrent detection bias circuit;

[0066] Terminals 8, 9, 10, 11, 12, and 13 of chip U2 are all connected to the pre-drive control circuit.

[0067] like Figure 3 As shown, pin 14 of chip U2 is connected to pin 3 of MCU programming port JP7; pin 15 of chip U2 is connected to pin 2 of MCU programming port JP7; pin 1 of MCU programming port JP7 is grounded; and pin 4 of MCU programming port JP7 is connected to the operating voltage of 5V.

[0068] Both pin 18 and pin 19 of chip U2 are connected to the optocoupler control circuit.

[0069] Terminal 23 of chip U2 is connected to one end of capacitor C8 and one end of resistor R19. The other end of capacitor C8 is conveniently connected to terminal 24 of chip U2 and the ground terminal. The other end of resistor R19 is connected to the operating voltage of 5V.

[0070] Furthermore, such as Figure 4 As shown, the bus voltage detection circuit includes a capacitor C11. One end of the capacitor C11 is connected to terminal 2 of chip U2 and one end of resistor R20, respectively. The other end of the capacitor C11 is grounded. The other end of the resistor R20 is connected to one end of resistor R24 ​​and one end of resistor R11, respectively. The other end of resistor R24 ​​is grounded. The other end of resistor R11 is connected to one end of resistor R10. The other end of resistor R11 is connected to the +310V voltage line.

[0071] Furthermore, such as Figure 5 As shown, the DC-DC BUCK step-down circuit includes a chip IC2. Terminal 4 of the chip IC2 is connected to the +310V voltage line, terminal 1 of the chip IC2 is connected to one end of a capacitor C1, and the other end of the capacitor C1 is connected to terminals 5, 6, and 7 of the chip IC2.

[0072] Terminal 2 of chip IC2 is connected to one end of resistor R2, one end of capacitor CE1, and the cathode of diode D1. Terminal 8 of chip IC2 is connected to the other end of resistor R2, the other end of capacitor CE1, the cathode of diode D5, and one end of inductor L1. The other end of inductor L1 is connected to the anode of diode D1, one end of capacitor CE2, the cathode of Zener diode ZD1, one end of resistor R7, and the operating voltage +12V. The anode of diode D5 is connected to the other end of capacitor CE2, the anode of Zener diode ZD1, and the other end of resistor R7, and then grounded.

[0073] Furthermore, such as Figure 6As shown, the 12V-5V step-down circuit includes a chip IC1. Terminal 3 of the chip IC1 is connected to the working voltage +12V and one end of the capacitor C3. The other end of the capacitor C3 is connected to one end of the capacitor C2 and terminal 2 of the chip IC1 and then grounded. The other end of the capacitor C2 is connected to terminal 1 of the chip IC1 and the working voltage +5V.

[0074] Furthermore, such as Figure 7 As shown, the operational amplifier detection circuit includes resistors R28 and R26. One end of resistor R28 is connected to terminal 3 of chip U2 and one end of capacitor C10, respectively. The other end of capacitor C10 is connected to one end of resistor R25 and terminal 5 of chip U2, respectively.

[0075] One end of the resistor R26 is connected to terminal 22 of the chip U2 and one end of the capacitor C32, respectively; the other end of the capacitor C32 is connected to one end of the resistor R16 and one end of the chip U2.

[0076] like Figure 12 As shown, the overcurrent detection bias circuit includes a resistor R12. One end of the resistor R12 is connected to terminal 4 of chip U2, one end of resistor R13, one end of resistor R18, and one end of capacitor C19. The other end of the resistor R12 is connected to the other ends of resistor R28 and resistor R26. The other end of the resistor R18 is connected to the operating voltage +5V. The other ends of the resistor R13 and capacitor C19 are both grounded.

[0077] Furthermore, such as Figure 8 As shown, the pre-drive control circuit includes chip U6, chip U7, and chip U9. Terminal 2 of chip U6 is connected to terminal 11 of chip U2 through resistor R33. Terminal 3 of chip U6 is connected to terminal 8 of chip U2 through resistor R35. Terminal 1 of chip U6 is connected to the operating voltage +12V and one end of capacitor C21. The other end of capacitor C21 is connected to terminal 4 of chip U6 and then grounded.

[0078] Terminal 8 of chip U6 is connected to one end of capacitor C15 and the negative terminal of diode D4. The positive terminal of diode D4 is connected to one end of resistor R23. The other end of resistor R23 is connected to the other end of resistor R21, the other end of resistor R14, and one end of capacitor C9, which is connected to the working voltage 12V. The other end of capacitor C9 is grounded.

[0079] Terminal 2 of chip U7 is connected to terminal 12 of chip U2 via resistor R39. Terminal 3 of chip U7 is connected to terminal 9 of chip U2 via resistor R40. Terminal 1 of chip U7 is connected to the operating voltage +12V and one end of capacitor C23. The other end of capacitor C23 is connected to terminal 4 of chip U7 and then grounded.

[0080] Terminal 8 of chip U7 is connected to one end of capacitor C22 and the negative terminal of diode D3, and the positive terminal of diode D3 is connected to one end of resistor R21.

[0081] Terminal 2 of chip U9 is connected to terminal 11 of chip U2 via resistor R43. Terminal 3 of chip U9 is connected to terminal 8 of chip U2 via resistor R45. Terminal 1 of chip U9 is connected to the operating voltage +12V and one end of capacitor C29. The other end of capacitor C29 is connected to terminal 4 of chip U9 and then grounded.

[0082] Terminal 8 of chip U9 is connected to one end of capacitor C26 and the negative terminal of diode D2, and the positive terminal of diode D2 is connected to one end of resistor R14.

[0083] Furthermore, such as Figure 9 As shown, the motor power inverter control circuit includes resistors R15, R22, R34, R37, R41, and R44. One end of resistor R15 is connected to terminal 7 of chip U6, and the other end of resistor R15 is connected to one end of resistor R17 and terminal 1 of MOSFET Q2. The other end of resistor R17 is connected to terminal 3 of MOSFET Q2, terminal 6 of chip U6, terminal 2 of MOSFET Q3, one end of capacitor C6, one end of capacitor C13, and terminal 1 of inductor L3.

[0084] Terminal 2 of the field-effect transistor Q2 is connected to a voltage of +310V, terminal 2 of the field-effect transistor Q4, terminal 2 of the field-effect transistor Q6, the other end of capacitor C6, one end of capacitor C17, and one end of capacitor C24.

[0085] One end of resistor R22 is connected to terminal 5 of chip U6, and the other end of resistor R22 is connected to one end of resistor R32 and terminal 1 of field-effect transistor Q3. The other end of resistor R32 is connected to terminal 3 of field-effect transistor Q2, the other end of capacitor C13, and one end of resistor RS1.

[0086] One end of resistor R34 is connected to terminal 7 of chip U7. The other end of resistor R34 is connected to one end of resistor R36 and terminal 1 of field-effect transistor Q4. The other end of resistor R36 is connected to terminal 3 of field-effect transistor Q4, terminal 6 of chip U7, terminal 2 of field-effect transistor Q5, the other end of capacitor C17, one end of capacitor C18, and terminal 2 of inductor L3.

[0087] One end of resistor R37 is connected to terminal 5 of chip U7. The other end of resistor R37 is connected to one end of resistor R38 and terminal 1 of MOSFET Q5. The other end of resistor R38 is connected to terminal 3 of MOSFET Q5 and one end of resistor RS2. The other end of resistor RS2 is connected to the other end of resistor RS1 and one end of resistor RS3.

[0088] One end of resistor R41 is connected to terminal 7 of chip U9, and the other end of resistor R41 is connected to one end of resistor R42 and terminal 1 of field-effect transistor Q6. The other end of resistor R42 is connected to terminal 3 of field-effect transistor Q6, terminal 2 of field-effect transistor Q7, terminal 6 of chip U9, and terminal 3 of inductor L3.

[0089] The other end of capacitor C24 is connected to one end of capacitor C27;

[0090] One end of resistor R44 is connected to terminal 5 of chip U9. The other end of resistor R44 is connected to one end of resistor R46 and terminal 1 of MOSFET Q7. The other end of resistor R46 is connected to terminal 3 of MOSFET Q7, the other end of capacitor C27, and one end of resistor RS3. The other end of resistor RS3 is grounded.

[0091] Furthermore, such as Figure 10 As shown, the AC-DC rectifier circuit includes a socket CN1. Terminal 1 of the socket CN1 is grounded. Terminal 2 of the socket CN1 is connected to one end of a fuse F1. The other end of the fuse F1 is connected to one end of a resistor MOV1 and one end of a resistor THR1. The other end of the resistor THR1 is connected to one end of a resistor R9, one end of a capacitor CX1, and terminal 1 of an inductor T1. The other end of the resistor R8 is connected to the other end of the resistor R9.

[0092] Terminal 3 of the connector CN1 is connected to the other end of resistor MOV1, one end of resistor R8, the other end of capacitor CX1, and terminal 4 of inductor T1.

[0093] Terminal 2 of inductor T1 is connected to one end of capacitor CX2 and terminal 3 of chip BD1. Terminal 3 of inductor T1 is connected to the other end of capacitor CX2 and terminal 2 of chip BD1. Terminal 1 of chip BD1 is connected to +310V voltage, the positive terminal of capacitor EC1, one end of capacitor CBB1, and one end of capacitor CY1. Terminal 4 of chip BD1 is connected to the negative terminal of capacitor EC1, the other end of capacitor CBB1, and one end of capacitor CY2. The other end of capacitor CY1 is connected to the other end of capacitor CY2 and PE1.

[0094] Furthermore, such as Figure 11 As shown, the optocoupler control circuit includes optocoupler chip U5 and optocoupler chip U1. One end of optocoupler chip U5 is connected to terminal 18 of chip U2 and one end of resistor R6, respectively. The other end of resistor R6 is grounded. The other end of optocoupler chip U5 provides PWM signal to the main control MCU through resistor R5.

[0095] One end of the optocoupler chip U1 is connected to the operating voltage +5V through resistor R3. The other end of the optocoupler chip U1 is connected to terminal 19 of chip U2. The third end of the optocoupler chip U1 is conveniently connected to terminal FG and one end of resistor R4. The other end of resistor R4 is grounded.

[0096] Specifically,

[0097] The BLDC control circuit of this utility model mainly consists of an AC-DC rectifier circuit, which can operate with a wide voltage range of 110-240V, a DC-DC BUCK auxiliary power supply circuit, an LDO 78L05 step-down circuit, and a BLDC drive and control circuit. The circuit meets the energy efficiency and safety certification requirements of BLDC, is convenient to produce, and is safe and reliable.

[0098] The voltage after AC rectification is output as DC12V through the DC-DC BUCK converter circuit. This voltage powers the pre-drive circuit module.

[0099] DC12V is stepped down to DC5V by a 78L05;

[0100] The main control MCU is an ARM platform-based M0 series MCU, which is mainly responsible for driving the three-phase brushless DC motor. It also outputs feedback signals to the host computer to monitor the motor's operation and abnormal status, and to read the driver software version. The host computer controls the motor speed by outputting PWM signals and adjusting the duty cycle or carrier frequency.

[0101] The selected motor is a three-phase brushless DC motor with characteristics such as long lifespan, high starting torque, and wide operating voltage range. The motor's drive modulation method adopts sensorless field vector control (FOC), which has advantages such as high operating efficiency, low noise, and stable output torque. The main control MCU estimates the motor's current position by collecting information such as the motor's bus voltage and phase current, and controls the amplitude and frequency of the inverter's output voltage to accurately control the motor's operation. The motor system's protection functions include: hardware overcurrent protection, software overcurrent protection, sampling error protection, undervoltage protection, overvoltage protection, phase loss protection, stall protection, starting protection, maximum speed and minimum speed monitoring protection, and maximum output power limiting protection. The main control MCU controls the motor's direction of rotation by controlling the direction of the conduction current in the stator's U, V, and W phases.

[0102] The optocoupler isolation control circuit includes output and input signal isolation, meets safety certification requirements, and feeds back the motor's operating status and software version information to the host computer. The host computer then outputs a PWM signal to the motor's main control MCU to achieve speed regulation of the motor.

Claims

1. A high-voltage non-isolated motor drive control circuit, characterized in that, The circuit includes an AC-DC rectifier circuit, a pre-drive control circuit, a motor power inverter control circuit, a bus voltage detection circuit, a DC-DC BUCK step-down circuit, a 12V-5V step-down circuit, a main control MCU, and an optocoupler control circuit. The AC-DC rectifier circuit is connected to the motor power inverter control circuit, the DC-DC BUCK step-down circuit, and the bus voltage detection circuit, respectively. The DC-DC BUCK step-down circuit is also connected to the 12V-5V step-down circuit and the motor power inverter control circuit, respectively. The 12V-5V step-down circuit is also connected to the main control MCU, and the main control MCU is also connected to the bus voltage detection circuit, the pre-drive control circuit, and the optocoupler control circuit, respectively. The pre-drive control circuit is also connected to the motor power inverter control circuit.

2. The high-voltage non-isolated motor drive control circuit according to claim 1, characterized in that, The main control MCU includes a chip U2. Terminal 1 of the chip U2 is connected to one end of capacitor C5 and the operating voltage 5V, and the other end of capacitor C5 is grounded. Terminal 2 of the chip U2 is connected to the bus voltage detection circuit; Terminals 3, 5, 21, and 22 of chip U2 are all connected to the operational amplifier detection circuit. Terminal 4 of the chip U2 is connected to the overcurrent detection bias circuit; Terminals 8, 9, 10, 11, 12, and 13 of chip U2 are all connected to the pre-drive control circuit. Terminal 14 of chip U2 is connected to terminal 3 of MCU programming port JP7; terminal 15 of chip U2 is connected to terminal 2 of MCU programming port JP7; terminal 1 of MCU programming port JP7 is grounded; and terminal 4 of MCU programming port JP7 is connected to the working voltage 5V. Both pin 18 and pin 19 of chip U2 are connected to the optocoupler control circuit. Terminal 23 of chip U2 is connected to one end of capacitor C8 and one end of resistor R19. The other end of capacitor C8 is conveniently connected to terminal 24 of chip U2 and the ground terminal. The other end of resistor R19 is connected to the operating voltage of 5V.

3. The high-voltage non-isolated motor drive control circuit according to claim 2, characterized in that, The bus voltage detection circuit includes a capacitor C11. One end of the capacitor C11 is connected to terminal 2 of chip U2 and one end of resistor R20, respectively. The other end of the capacitor C11 is grounded. The other end of the resistor R20 is connected to one end of resistor R24 ​​and one end of resistor R11, respectively. The other end of resistor R24 ​​is grounded. The other end of resistor R11 is connected to one end of resistor R10 and the other end of resistor R11 is connected to the +310V voltage line.

4. The high-voltage non-isolated motor drive control circuit according to claim 3, characterized in that, The DC-DCBUCK step-down circuit includes a chip IC2. Terminal 4 of the chip IC2 is connected to the +310V voltage line, terminal 1 of the chip IC2 is connected to one end of a capacitor C1, and the other end of the capacitor C1 is connected to terminals 5, 6, and 7 of the chip IC2. Terminal 2 of chip IC2 is connected to one end of resistor R2, one end of capacitor CE1, and the cathode of diode D1. Terminal 8 of chip IC2 is connected to the other end of resistor R2, the other end of capacitor CE1, the cathode of diode D5, and one end of inductor L1. The other end of inductor L1 is connected to the anode of diode D1, one end of capacitor CE2, the cathode of Zener diode ZD1, one end of resistor R7, and the operating voltage +12V. The anode of diode D5 is connected to the other end of capacitor CE2, the anode of Zener diode ZD1, and the other end of resistor R7, and then grounded.

5. The high-voltage non-isolated motor drive control circuit according to claim 4, characterized in that, The 12V-5V step-down circuit includes a chip IC1. Terminal 3 of the chip IC1 is connected to the working voltage +12V and one end of capacitor C3. The other end of capacitor C3 is connected to one end of capacitor C2 and terminal 2 of the chip IC1 and then grounded. The other end of capacitor C2 is connected to terminal 1 of the chip IC1 and the working voltage +5V.

6. The high-voltage non-isolated motor drive control circuit according to claim 2, characterized in that, The operational amplifier detection circuit includes resistors R28 and R26. One end of resistor R28 is connected to terminal 3 of chip U2 and one end of capacitor C10, respectively. The other end of capacitor C10 is connected to one end of resistor R25 and terminal 5 of chip U2, respectively. One end of the resistor R26 is connected to terminal 22 of the chip U2 and one end of the capacitor C32, respectively; the other end of the capacitor C32 is connected to one end of the resistor R16 and one end of the chip U2. The overcurrent detection bias circuit includes a resistor R12. One end of the resistor R12 is connected to terminal 4 of chip U2, one end of resistor R13, one end of resistor R18, and one end of capacitor C19. The other end of the resistor R12 is connected to the other ends of resistor R28 and resistor R26. The other end of the resistor R18 is connected to the operating voltage +5V. The other ends of the resistor R13 and capacitor C19 are both grounded.

7. The high-voltage non-isolated motor drive control circuit according to claim 2, characterized in that, The pre-drive control circuit includes chips U6, U7, and U9. Terminal 2 of chip U6 is connected to terminal 11 of chip U2 through resistor R33. Terminal 3 of chip U6 is connected to terminal 8 of chip U2 through resistor R35. Terminal 1 of chip U6 is connected to the operating voltage +12V and one end of capacitor C21. The other end of capacitor C21 is connected to terminal 4 of chip U6 and then grounded. Terminal 8 of chip U6 is connected to one end of capacitor C15 and the negative terminal of diode D4. The positive terminal of diode D4 is connected to one end of resistor R23. The other end of resistor R23 is connected to the other end of resistor R21, the other end of resistor R14, and one end of capacitor C9, which is connected to the working voltage 12V. The other end of capacitor C9 is grounded. Terminal 2 of chip U7 is connected to terminal 12 of chip U2 via resistor R39. Terminal 3 of chip U7 is connected to terminal 9 of chip U2 via resistor R40. Terminal 1 of chip U7 is connected to the operating voltage +12V and one end of capacitor C23. The other end of capacitor C23 is connected to terminal 4 of chip U7 and then grounded. Terminal 8 of chip U7 is connected to one end of capacitor C22 and the negative terminal of diode D3, and the positive terminal of diode D3 is connected to one end of resistor R21. Terminal 2 of chip U9 is connected to terminal 11 of chip U2 via resistor R43. Terminal 3 of chip U9 is connected to terminal 8 of chip U2 via resistor R45. Terminal 1 of chip U9 is connected to the operating voltage +12V and one end of capacitor C29. The other end of capacitor C29 is connected to terminal 4 of chip U9 and then grounded. Terminal 8 of chip U9 is connected to one end of capacitor C26 and the negative terminal of diode D2, and the positive terminal of diode D2 is connected to one end of resistor R14.

8. The high-voltage non-isolated motor drive control circuit according to claim 7, characterized in that, The motor power inverter control circuit includes resistors R15, R22, R34, R37, R41, and R44. One end of resistor R15 is connected to terminal 7 of chip U6, and the other end of resistor R15 is connected to one end of resistor R17 and terminal 1 of MOSFET Q2. The other end of resistor R17 is connected to terminal 3 of MOSFET Q2, terminal 6 of chip U6, terminal 2 of MOSFET Q3, one end of capacitor C6, one end of capacitor C13, and terminal 1 of inductor L3. Terminal 2 of the field-effect transistor Q2 is connected to a voltage of +310V, terminal 2 of the field-effect transistor Q4, terminal 2 of the field-effect transistor Q6, the other end of capacitor C6, one end of capacitor C17, and one end of capacitor C24. One end of resistor R22 is connected to terminal 5 of chip U6, and the other end of resistor R22 is connected to one end of resistor R32 and terminal 1 of field-effect transistor Q3. The other end of resistor R32 is connected to terminal 3 of field-effect transistor Q2, the other end of capacitor C13, and one end of resistor RS1. One end of resistor R34 is connected to terminal 7 of chip U7. The other end of resistor R34 is connected to one end of resistor R36 and terminal 1 of field-effect transistor Q4. The other end of resistor R36 is connected to terminal 3 of field-effect transistor Q4, terminal 6 of chip U7, terminal 2 of field-effect transistor Q5, the other end of capacitor C17, one end of capacitor C18, and terminal 2 of inductor L3. One end of resistor R37 is connected to terminal 5 of chip U7. The other end of resistor R37 is connected to one end of resistor R38 and terminal 1 of MOSFET Q5. The other end of resistor R38 is connected to terminal 3 of MOSFET Q5 and one end of resistor RS2. The other end of resistor RS2 is connected to the other end of resistor RS1 and one end of resistor RS3. One end of resistor R41 is connected to terminal 7 of chip U9, and the other end of resistor R41 is connected to one end of resistor R42 and terminal 1 of field-effect transistor Q6. The other end of resistor R42 is connected to terminal 3 of field-effect transistor Q6, terminal 2 of field-effect transistor Q7, terminal 6 of chip U9, and terminal 3 of inductor L3. The other end of capacitor C24 is connected to one end of capacitor C27; One end of resistor R44 is connected to terminal 5 of chip U9. The other end of resistor R44 is connected to one end of resistor R46 and terminal 1 of MOSFET Q7. The other end of resistor R46 is connected to terminal 3 of MOSFET Q7, the other end of capacitor C27, and one end of resistor RS3. The other end of resistor RS3 is grounded.

9. The high-voltage non-isolated motor drive control circuit according to claim 5, characterized in that, The AC-DC rectifier circuit includes a socket CN1. Terminal 1 of socket CN1 is grounded. Terminal 2 of socket CN1 is connected to one end of fuse F1. The other end of fuse F1 is connected to one end of resistor MOV1 and one end of resistor THR1. The other end of resistor THR1 is connected to one end of resistor R9, one end of capacitor CX1, and terminal 1 of inductor T1. Terminal 3 of connector CN1 is connected to the other end of resistor MOV1, one end of resistor R8, the other end of capacitor CX1, and terminal 4 of inductor T1; the other end of resistor R8 is connected to the other end of resistor R9. Terminal 2 of inductor T1 is connected to one end of capacitor CX2 and terminal 3 of chip BD1. Terminal 3 of inductor T1 is connected to the other end of capacitor CX2 and terminal 2 of chip BD1. Terminal 1 of chip BD1 is connected to +310V voltage, the positive terminal of capacitor EC1, one end of capacitor CBB1, and one end of capacitor CY1. Terminal 4 of chip BD1 is connected to the negative terminal of capacitor EC1, the other end of capacitor CBB1, and one end of capacitor CY2. The other end of capacitor CY1 is connected to the other end of capacitor CY2 and PE1.

10. The high-voltage non-isolated motor drive control circuit according to claim 1, characterized in that, The optocoupler control circuit includes optocoupler chip U5 and optocoupler chip U1. One end of optocoupler chip U5 is connected to terminal 18 of chip U2 and one end of resistor R6 respectively. The other end of resistor R6 is grounded. The other end of optocoupler chip U5 provides PWM signal to the main control MCU through resistor R5. One end of the optocoupler chip U1 is connected to the operating voltage +5V through resistor R3. The other end of the optocoupler chip U1 is connected to terminal 19 of chip U2. The third end of the optocoupler chip U1 is conveniently connected to terminal FG and one end of resistor R4. The other end of resistor R4 is grounded.

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