Non-inductive permanent magnet motor control device based on FU6812L2

Abstract

The utility model discloses a non-inductive permanent magnet motor control device based on FU6812L2, which comprises a main control circuit, a power driving circuit and a power supply circuit, and is characterized in that the main control circuit comprises an FU6812L2 type central processing unit; the output end of the power supply circuit is electrically connected with the input end of the central processing unit and the input end of the power driving circuit, the output end of the central processing unit is electrically connected with the non-inductive permanent magnet motor through the power driving circuit, and the output end of the power driving circuit is further electrically connected with the input end of the central processing unit. And the input end of the power supply circuit is also electrically connected with the output end of the central processing unit. According to the utility model, based on the FU6812L2 type central processing unit, the cost and complexity of the motor control system are obviously reduced on the basis of realizing efficient and stable control of the non-inductive permanent magnet motor, and the motor control system has relatively high cost performance.

Description

Technical Field

[0001] This utility model relates to the field of motor control, specifically to a sensorless permanent magnet motor control device based on FU6812L2. Background Technology

[0002] The working principle of a sensorless permanent magnet synchronous motor is mainly based on the interaction of the magnetic fields of a permanent magnet and an electromagnetic coil to generate rotational torque, thereby driving the motor to rotate. Compared with a sensor-driven permanent magnet synchronous motor, a sensorless permanent magnet synchronous motor does not require induction of the motor rotor through an induction armature. Therefore, its structure is relatively simple and its cost is lower. It is widely used in low-to-medium performance and low-cost fields such as household appliances, power tools, and robots.

[0003] Currently, the control circuits for sensorless permanent magnet synchronous motors typically employ an architecture composed of sensors, encoders, and other devices to monitor and control the motor's status, achieving precise motor control. However, this control circuit is relatively expensive, resulting in a low cost-performance ratio for the entire sensorless permanent magnet motor in practical applications. Utility Model Content

[0004] In view of this, the present invention provides a sensorless permanent magnet motor control device based on FU6812L2 to solve the problem that the high cost of existing sensorless permanent magnet motor control circuits leads to the low cost-effectiveness of the entire sensorless permanent magnet motor in practical applications.

[0005] This utility model provides a sensorless permanent magnet motor control device based on FU6812L2. The device includes a main control circuit, a power drive circuit and a power supply circuit. The main control circuit includes a central processing unit of model FU6812L2.

[0006] The output terminal of the power supply circuit is electrically connected to both the input terminal of the central processing unit and the input terminal of the power drive circuit. The output terminal of the central processing unit is electrically connected to the sensorless permanent magnet motor through the power drive circuit. The output terminal of the power drive circuit is also electrically connected to the input terminal of the central processing unit, and the input terminal of the power supply circuit is also electrically connected to the output terminal of the central processing unit.

[0007] Optionally, the power drive circuit includes a three-phase inverter unit, a drive unit, and a three-phase current acquisition unit; the input terminals of the three-phase inverter unit, the drive unit, and the three-phase current acquisition unit are all electrically connected to the output terminal of the power supply circuit; the input terminal of the three-phase inverter unit is also electrically connected to the output terminal of the central processing unit; the output terminal of the three-phase inverter unit is electrically connected to the sensorless permanent magnet motor through the drive unit; the input terminal of the three-phase current acquisition unit is electrically connected to the output terminal of the drive unit; and the output terminal of the three-phase current acquisition unit is electrically connected to the input terminal of the central processing unit.

[0008] Optionally, the three-phase inverter unit includes a three-phase half-bridge driver chip U9, capacitors C44, C46, ​​C48, C50, and C54, and resistors R57, R58, R59, R60, R63, R64, R65, R66, R67, R71, and R72.

[0009] The low-side power supply pin VCC of the three-phase half-bridge driver chip U9 is electrically connected to the output terminal of the power supply circuit. The power ground pin VSS and the low-side gate drive pin COM of the three-phase half-bridge driver chip U9 are both grounded. The first end of capacitor C44 is connected to the common connection between the low-side power supply pin VCC of the three-phase half-bridge driver chip U9 and the output terminal of the power supply circuit, and the second end of capacitor C44 is grounded. The first high-side signal input pin HIN1 of the three-phase half-bridge driver chip U9 is electrically connected to the output terminal of the central processing unit through resistor R57, and the second high-side signal input pin HIN2 of the three-phase half-bridge driver chip U9 is electrically connected to the output terminal of the central processing unit through resistor R57. Resistor R58 is electrically connected to the output terminal of the central processing unit. The third high-side signal input pin HIN3 of the three-phase half-bridge driver chip U9 is electrically connected to the output terminal of the central processing unit through resistor R59. The first low-side signal input pin LIN1 of the three-phase half-bridge driver chip U9 is electrically connected to the output terminal of the central processing unit through resistor R60. The second low-side signal input pin LIN2 of the three-phase half-bridge driver chip U9 is electrically connected to the output terminal of the central processing unit through resistor R63. The third low-side signal input pin LIN3 of the three-phase half-bridge driver chip U9 is electrically connected to the output terminal of the central processing unit through resistor R65.

[0010] The fault indication pin FAULT of the three-phase half-bridge driver chip U9 is electrically connected to the output terminal of the central processing unit through resistor R67. The first end of resistor R64 is connected to the common connection terminal between resistor R67 and the output terminal of the central processing unit, and the second end of resistor R64 is electrically connected to the output terminal of the power supply circuit. The enable pin EN of the three-phase half-bridge driver chip U9 is electrically connected to the output terminal of the central processing unit through resistor R71. The external RC input pin RCIN of the three-phase half-bridge driver chip U9 is electrically connected to the output terminal of the power supply circuit through resistor R72. The first end of capacitor C50 is connected to the common connection terminal between the external RC input pin RCIN of the three-phase half-bridge driver chip U9 and resistor R72, and the second end of capacitor C50 is grounded.

[0011] The first high-side floating absolute voltage pin VB1 of the three-phase half-bridge driver chip U9 is electrically connected to the input terminal of the driver unit through capacitor C46. The second high-side floating absolute voltage pin VB2 of the three-phase half-bridge driver chip U9 is electrically connected to the input terminal of the driver unit through capacitor C48. The third high-side floating absolute voltage pin VB3 of the three-phase half-bridge driver chip U9 is electrically connected to the input terminal of the driver unit through capacitor C54. The first high-side floating offset voltage pins VS1, VS2, VS3, HO1, HO2, HO3, LO1, LO2, and LO3 of the three-phase half-bridge driver chip U9 are all electrically connected to the input terminal of the driver unit.

[0012] Optionally, the driving unit includes MOSFETs Q5, Q6, Q7, Q8, Q9, and Q10; diodes D15, D16, D17, D18, D22, and D23; capacitors C47, C49, C51, C52, C57, and C58; and resistors R55, R56, R61, R66, R70, R74, R75, R78, R79, R81, R87, R88, R90, R91, and R92.

[0013] The drains of MOSFETs Q5, Q7, and Q9 are all electrically connected to the output terminal of the power supply circuit. The source of MOSFET Q5 is electrically connected to the drain of MOSFET Q6, the source of MOSFET Q7 is electrically connected to the drain of MOSFET Q8, and the source of MOSFET Q9 is electrically connected to the drain of MOSFET Q10. The source of MOSFET Q6 is grounded through resistor R70, the source of MOSFET Q8 is grounded through resistor R81, and the source of MOSFET Q10 is grounded through resistor R92. The source of MOSFET Q5... The common connection terminals between the drain of MOSFET Q6, Q7 and Q8, and Q9 and Q10 are all electrically connected to the inductive permanent magnet motor; the common connection terminals between the source of MOSFET Q6 and resistor R70, Q8 and R81, and Q10 and R92 are all electrically connected to the input terminal of the three-phase current acquisition unit.

[0014] The base of MOSFET Q5 is electrically connected to the output terminal of the three-phase inverter unit through resistor R55. The first end of resistor R56, the first end of capacitor C47, and the anode of diode D15 are all connected to the common connection between the base of MOSFET Q5 and resistor R55. The second end of resistor R56 and the second end of capacitor C47 are all connected to the common connection between the source of MOSFET Q5 and the drain of MOSFET Q6. The cathode of diode D15 is electrically connected to the output terminal of the three-phase inverter unit. The base of MOSFET Q6 is electrically connected to the output terminal of the three-phase inverter unit through resistor R61. The first end of resistor R66, the first end of capacitor C49, and the anode of diode D16 are all connected to the common connection between the base of MOSFET Q6 and resistor R61. The second end of resistor R66 and the second end of capacitor C49 are all connected to the common connection between the source of MOSFET Q6 and resistor R70. The cathode of diode D16 is electrically connected to the output terminal of the three-phase inverter unit.

[0015] The base of MOSFET Q7 is electrically connected to the output terminal of the three-phase inverter unit through resistor R74. The first end of resistor R75, the first end of capacitor C51, and the anode of diode D17 are all connected to the common connection terminal between the base of MOSFET Q7 and resistor R74. The second end of resistor R75 and the second end of capacitor C51 are both connected to the common connection terminal between the source of MOSFET Q7 and the drain of MOSFET Q8. The cathode of diode D17 is electrically connected to the output terminal of the three-phase inverter unit. The base of MOSFET Q8 is electrically connected to the output terminal of the three-phase inverter unit through resistor R78. The first end of resistor R79, the first end of capacitor C52, and the anode of diode D18 are all connected to the common connection terminal between the base of MOSFET Q8 and resistor R78. The second end of resistor R79 and the second end of capacitor C52 are both connected to the common connection terminal between the source of MOSFET Q8 and resistor R81. The cathode of diode D18 is electrically connected to the output terminal of the three-phase inverter unit.

[0016] The base of MOSFET Q9 is electrically connected to the output terminal of the three-phase inverter unit through resistor R87. The first end of resistor R88, the first end of capacitor C57, and the anode of diode D22 are all connected to the common connection between the base of MOSFET Q9 and resistor R87. The second end of resistor R88 and the second end of capacitor C57 are both connected to the common connection between the source of MOSFET Q9 and the drain of MOSFET Q10. The cathode of diode D22 is electrically connected to the output terminal of the three-phase inverter unit. The base of MOSFET Q10 is electrically connected to the output terminal of the three-phase inverter unit through resistor R90. The first end of resistor R91, the first end of capacitor C58, and the anode of diode D23 are all connected to the common connection between the base of MOSFET Q10 and resistor R90. The second end of resistor R91 and the second end of capacitor C58 are both connected to the common connection between the source of MOSFET Q10 and resistor R92. The cathode of diode D23 is electrically connected to the output terminal of the three-phase inverter unit.

[0017] Optionally, the three-phase current acquisition unit includes three current acquisition sub-circuits;

[0018] Each of the current acquisition sub-circuits includes an operational amplifier, a first capacitor, a second capacitor, a third capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, and an eleventh resistor;

[0019] In each current acquisition sub-circuit, the positive power supply pin of the operational amplifier is electrically connected to the output terminal of the power supply circuit, and the negative power supply pin of the operational amplifier is grounded; the positive input pin of the operational amplifier is electrically connected to the output terminal of the driving unit through the sixth resistor and the fifth resistor in sequence, and the inverting input pin of the operational amplifier is grounded through the ninth resistor and the eighth resistor in sequence; the first end of the first capacitor is connected to the common connection terminal between the sixth resistor and the fifth resistor, and the second end of the first capacitor is connected to the common connection terminal between the ninth resistor and the eighth resistor;

[0020] The positive input pin of the operational amplifier is also electrically connected to the output terminal of the power supply circuit through the third resistor and the first resistor in sequence. The first end of the second resistor and the first end of the fourth resistor are both connected to the common connection terminal between the third resistor and the first resistor. The second end of the second resistor is grounded, and the second end of the fourth resistor is connected to the common connection terminal between the positive input pin of the operational amplifier and the third resistor.

[0021] The output pin of the op-amp is electrically connected to the input terminal of the central processing unit through the seventh resistor. The first end of the tenth resistor, the first end of the eleventh resistor, and the first end of the third capacitor are all connected to the common connection terminal between the inverting input pin of the op-amp and the ninth resistor. The second end of the tenth resistor, the second end of the eleventh resistor, and the second end of the third capacitor are all connected to the common connection terminal between the output pin of the op-amp and the seventh resistor. The first end of the second capacitor is connected to the common connection terminal between the seventh resistor and the input terminal of the central processing unit, and the second end of the second capacitor is grounded.

[0022] Optionally, the power drive circuit further includes a current sampling protection unit, the input terminal of which is electrically connected to the output terminal of the drive unit and the output terminal of the power supply circuit, and the output terminal of which is electrically connected to the input terminal of the central processing unit.

[0023] Optionally, the current sampling protection unit includes an operational amplifier U4B, diodes D19, D20, and D21, capacitors C53, C55, and C56, and resistors R76, R77, R80, R82, R83, R84, R85, and R86.

[0024] The positive power supply pin of the operational amplifier U4B is electrically connected to the output terminal of the power supply circuit. The first end of the capacitor C55 is connected to the common connection terminal between the positive power supply pin of the operational amplifier U4B and the output terminal of the power supply circuit, and the second end of the capacitor C55 is grounded. The negative power supply pin of the operational amplifier U4B is grounded.

[0025] The positive input pin of operational amplifier U4B is grounded through resistor R76; the first ends of resistors R80, R82, and R84 are all electrically connected to the output of the drive unit; the second end of resistor R80 is electrically connected to the positive input pin of operational amplifier U4B through diode D19; the second end of resistor R82 is electrically connected to the positive input pin of operational amplifier U4B through diode D20; and the second end of resistor R84 is electrically connected to the positive input pin of operational amplifier U4B through diode D21. The negative input pin of operational amplifier U4B is grounded through capacitor C56; the first ends of resistors R85 and R86 are both connected to the common connection between the negative input pin of operational amplifier U4B and capacitor C56; the second end of resistor R85 is electrically connected to the output of the power supply circuit; and the second end of resistor R86 is grounded.

[0026] The output pin of the operational amplifier U4B is electrically connected to the input terminal of the central processing unit through resistor R77. The first end of resistor R83 and the first end of capacitor C53 are both connected to the common connection terminal between the output pin of operational amplifier U4B and resistor R77. The second end of resistor R83 and the second end of capacitor C53 are both grounded.

[0027] Optionally, the power supply circuit includes a safety filter unit, a surge suppression rectification unit, a power factor correction unit, an analog-to-digital converter unit, and a DC-DC converter unit;

[0028] The input terminal of the safety filter unit is electrically connected to an external power supply. The output terminal of the safety filter unit is electrically connected to the input terminal of the DC-DC converter unit via the surge suppression rectification unit, the power factor correction unit, the analog-to-digital converter unit, and the DC-DC converter unit in sequence. The output terminals of the power factor correction unit, the analog-to-digital converter unit, and the DC-DC converter unit are all electrically connected to the input terminal of the power drive circuit. The output terminal of the DC-DC converter unit is also electrically connected to the input terminal of the central processing unit. The input terminals of the surge suppression rectification unit and the power factor correction unit are also electrically connected to the output terminal of the central processing unit.

[0029] Optionally, the safety filter unit includes a common-mode inductor FL1, a fuse F1, capacitors CX1, CX2, CY2, CY3, resistors R62, R68, R69, and R73.

[0030] Pin 2 of common mode inductor FL1 is electrically connected to the positive signal terminal of the external power supply through fuse F1, and pin 1 of common mode inductor FL1 is electrically connected to the negative signal terminal of the external power supply. The first end of resistor R68 and the first end of capacitor CX1 are both connected to the common connection terminal between pin 2 of common mode inductor FL1 and fuse F1. The second end of resistor R68 and the second end of capacitor CX1 are both connected to the common connection terminal between pin 1 of common mode inductor FL1 and the negative signal terminal of the external power supply.

[0031] Pins 3 and 4 of the common-mode inductor FL1 are electrically connected to the input terminal of the surge suppression rectifier unit. The first terminals of capacitors CX2 and CY2 are connected to the common connection terminal between pin 3 of the common-mode inductor FL1 and the input terminal of the surge suppression rectifier unit. The second terminal of capacitor CY2 is grounded. The second terminal of capacitor CX2 and the first terminal of capacitor CY3 are connected to the common connection terminal between pin 4 of the common-mode inductor FL1 and the input terminal of the surge suppression rectifier unit. The second terminal of capacitor CY3 is grounded. The first terminal of resistor R62 is connected to the common connection terminal between pin 3 of the common-mode inductor FL1 and the input terminal of the surge suppression rectifier unit. The second terminal of resistor R62 is connected to the common connection terminal between pin 4 of the common-mode inductor FL1 and the input terminal of the surge suppression rectifier unit through resistors R69 and R73 in sequence.

[0032] Optionally, the surge suppression rectifier unit includes a relay K1, a bridge rectifier diode D3, a diode D4, a transistor Q2, a resistor R1, a resistor R6, a resistor R9, a resistor R10, and a resistor R58.

[0033] The first input pin of the bridge rectifier diode D3 is electrically connected to the first output terminal of the safety filter unit through resistor R1, and the second input pin of the bridge rectifier diode D3 is electrically connected to the second output terminal of the safety filter unit; both the first and second output pins of the bridge rectifier diode D3 are electrically connected to the input terminal of the power factor correction unit.

[0034] The first terminal of the relay K1 coil is electrically connected to the +15V power supply terminal, and the second terminal of the relay K1 coil is electrically connected to the collector of transistor Q2 through resistor R6. The anode of diode D4 and the first terminal of resistor R58 are both connected to the common connection between the second terminal of the relay K1 coil and resistor R6. The cathode of diode D4 is connected to the common connection between the first terminal of the relay K1 coil and the +15V power supply terminal, and the second terminal of resistor R58 is connected to the common connection between resistor R6 and the collector of transistor Q2. The base of transistor Q2 is electrically connected to the output terminal of the central processing unit through resistor R9. The first end of resistor R10 is connected to the common connection terminal between the base of transistor Q2 and resistor R9, and the second end of resistor R10 is grounded. The emitter of transistor Q2 is grounded. The stationary contact of relay K1 is connected to the common connection terminal between the first input pin of bridge rectifier diode D3 and resistor R1. The first moving contact of relay K1 is connected to the common connection terminal between resistor R1 and the first output terminal of the safety filter unit. The second moving contact of relay K1 is floating.

[0035] Optionally, the power factor correction unit includes a power factor correction chip U8, MOSFETs Q1 and Q3, transistor Q4, inductor L1, Schottky diodes D4, D3, D10, and D11, a unidirectional diode D13, capacitors CY1, C22, C23, C24, C25, C26, C27, C36, C37, and C... 38, capacitor C39, capacitor C40, capacitor C41, capacitor C42, capacitor C43, capacitor C45, resistor R27, resistor R29, resistor R30, resistor R31, resistor R32, resistor R34, resistor R35, resistor R37, resistor R38, resistor R40, resistor R41, resistor R44, resistor R46, resistor R47, resistor R48, resistor R49, resistor R51, resistor R52, resistor R53 and resistor R54;

[0036] The first terminal of inductor L1 is electrically connected to the first output terminal of the surge suppression rectifier unit. The second terminal of inductor L1 is electrically connected to both the input terminal of the analog-to-digital converter unit and the input terminal of the power drive circuit via Schottky diode D4. The anode of diode D3 and the first terminal of capacitor CY1 are both connected to the common connection between the first terminal of inductor L1 and the first output terminal of the surge suppression rectifier unit. The cathode of diode D3 is connected to the common connection between Schottky diode D4 and the input terminal of the analog-to-digital converter unit. The second terminal of capacitor CY1 is electrically connected to the second output terminal of the surge suppression rectifier unit. Capacitor C... The first terminal of capacitor C22, the first terminal of capacitor C23, the positive terminals of polarized capacitors C24, C25, and C26 are all connected to the common connection terminal between Schottky diode D4 and the input terminal of the analog-to-digital converter unit. The second terminals of capacitors C22, C23, C24, C25, and C26 are all grounded. The negative terminal of diode D11 and the first terminal of resistor R32 are both electrically connected to the second output terminal of the surge suppression rectifier unit. The positive terminal of diode D11 and the second terminal of resistor R32 are both grounded.

[0037] The source of MOSFET Q1 is connected to the common connection between the second terminal of inductor L1 and Schottky diode D4. The drain of MOSFET Q1 is grounded. The gate of MOSFET Q1 is electrically connected to the gate driver chip GATE of power factor correction chip U8 through resistor R29. The anode of diode D10, the first terminal of resistor R27, and the first terminal of capacitor C27 are all connected to the common connection between the gate of MOSFET and resistor R29. The cathode of diode D10 is connected to the common connection between resistor R29 and the gate driver chip GATE of power factor correction chip U8. The second terminals of resistor R27 and capacitor C27 are both grounded.

[0038] The inductor current detection pin ISENSE of the power factor correction chip U8 is electrically connected to the second output terminal of the surge suppression rectifier unit through resistor R44. The first terminal of capacitor C38 is connected to the common connection terminal between the inductor current detection pin ISENSE of the power factor correction chip U8 and resistor R44, and the second terminal of capacitor C38 is grounded. The ground pin GND of the power factor correction chip U8 is grounded, the current loop compensation pin ICOMP of the power factor correction chip U8 is grounded through capacitor C36, and the frequency setting pin FREQ of the power factor correction chip U8 is grounded through resistor R46. The power supply pin VCC of the power factor correction chip U8 is grounded through capacitor C43, and the first terminal of capacitor C42 is connected to the power supply pin of the power factor correction chip U8. The common connection between VCC and capacitor C43 is used, and the second terminal of capacitor C42 is grounded. The output voltage detection pin VSENSE of the power factor correction chip U8 is grounded through resistor R49. The first terminal of capacitor C39 and the first terminal of resistor R48 are both connected to the common connection between the output voltage detection pin VSENSE of the power factor correction chip U8 and resistor R49. The second terminal of capacitor C39 and the second terminal of resistor R48 are both grounded. The voltage loop compensation pin VCOMP of the power factor correction chip U8 is grounded through resistor R47 and capacitor C41 in sequence. The first terminal of capacitor C40 is connected to the common connection between the voltage loop compensation pin VCOMP of the power factor correction chip U8 and resistor R47. The second terminal of capacitor C40 is grounded.

[0039] The gate of MOSFET Q3 is electrically connected to the collector of transistor Q4 through resistor R52. The source of MOSFET Q3 is electrically connected to the +15V power supply terminal. The first end of resistor R51 is connected to the common connection between the source of MOSFET Q3 and the +15V power supply terminal. The second end of resistor R51 is connected to the common connection between the gate of MOSFET Q3 and resistor R52. The drain of MOSFET Q3 is connected to the common connection between the power supply pin VCC of power factor correction chip U8 and capacitor C43. The base of transistor Q4 is electrically connected to the output terminal of the central processing unit through resistor R53. The first end of resistor R54 and the first end of capacitor C45 are both connected to the common connection between the base of transistor Q4 and resistor R53. The second end of resistor R54 and the second end of capacitor C45 are both grounded. The emitter of transistor Q4 is grounded.

[0040] The first ends of resistors R30 and R31 are both connected to the common connection between Schottky diode D4 and the input terminal of the analog-to-digital converter unit; the second end of resistor R30 is connected in sequence through resistors R34, R37, and R41 to the common connection between the output voltage detection pin VSENSE of the power factor correction chip U8 and resistor R49; the second end of resistor R31 is electrically connected to the input terminal of the power drive circuit in sequence through resistors R35 and R38; the first end of resistor R40 and the first end of capacitor C37 are both connected to the common connection between resistor R38 and the input terminal of the power drive circuit, and the second ends of resistor R40 and capacitor C37 are both grounded;

[0041] The unidirectional diode D13 includes a first sub-diode and a second sub-diode; wherein, the cathode of the first sub-diode is connected together with the anode of the second sub-diode and connected to the common connection terminal between resistor R38 and the input terminal of the power drive circuit; the anode of the first sub-diode is grounded, and the cathode of the second sub-diode is electrically connected to the +3.3V power supply terminal.

[0042] Optionally, the analog-to-digital conversion unit includes a power management chip U5, an inductor L2, a diode D5, a diode D7, a diode D8, a light-emitting diode D9, a capacitor C16, a capacitor C18, a capacitor C19, a capacitor C20, a capacitor C21, a polarized capacitor C17, a resistor R24, a resistor R25, a resistor R26, and a resistor R28.

[0043] The drain pin DRAIN of the power management chip U5 is electrically connected to the output terminal of the power factor correction unit. The first end of the capacitor C16 is connected to the common connection terminal between the drain pin DRAIN of the power management chip U5 and the output terminal of the power factor correction unit, and the second end of the capacitor C16 is grounded. The ground pin GND of the power management chip U5 is electrically connected to the input terminal of the DC-DC conversion unit and the input terminal of the power drive circuit through the inductor L2. The unused pin NC of the power management chip U5 is connected to the common connection terminal between the ground pin GND of the power management chip U5 and the inductor L2.

[0044] The anode of diode D7 is connected to the common connection between inductor L2 and the input terminal of the DC-DC conversion unit. The cathode of diode D7 is connected to the common connection between the ground pin GND of power management chip U5 and inductor L2 via diode D8 and capacitor C18. The first terminals of resistor R24 ​​and capacitor C19 are both connected to the common connection between the ground pin GND of power management chip U5 and inductor L2. The second terminal of resistor R24 ​​is connected to the common connection between the cathode of diode D7 and diode D8 via resistor R28. The second terminal of capacitor C19 is also connected to the common connection between the cathode of diode D7 and diode D8. The power supply pin VCC of power management chip U5 is connected to the common connection between diode D8 and capacitor C18. The error amplifier input pin EA-IN of power management chip U5 is connected to the common connection between the second terminal of resistor R24 ​​and resistor R28.

[0045] The first terminals of capacitors C20 and C21 are both connected to the common connection between the ground pin GND of power management chip U5 and inductor L2. The second terminal of capacitor C20 is electrically connected to the error amplifier output pin EA-OUT of power management chip U5. The second terminal of capacitor C21 is connected to the common connection between the second terminal of capacitor C20 and the error amplifier output pin EA-OUT of power management chip U5 through resistor R26. The negative terminal of diode D5 is connected to the common connection between the ground pin GND of power management chip U5 and inductor L2, and the positive terminal of diode D5 is grounded. The positive terminal of polarized capacitor C17 and the first terminal of resistor R25 are both connected to the common connection between inductor L2 and the input terminal of the DC-DC conversion unit. The negative terminal of polarized capacitor C17 is grounded, and the second terminal of resistor R25 is grounded through light-emitting diode D9.

[0046] Optionally, the DC-DC conversion unit includes a voltage regulator chip U7, a conversion chip U6, an inductor L3, capacitors C28, C29, C30, C31, C32, C33, C34, C35, a resistor R33, and a resistor R39.

[0047] The power supply pin VIN of the voltage regulator chip U7 is connected to the enable pin EN, and is electrically connected to the output of the analog-to-digital converter unit. The first ends of capacitors C33, C34, and C35 are all connected to the common connection point between the power supply pin VIN of the voltage regulator chip U7 and the output of the analog-to-digital converter unit. The second ends of capacitors C33, C34, and C35 are all grounded. The ground pin GND of the voltage regulator chip U7 is grounded.

[0048] The switching pin SW of the voltage regulator chip U7 is electrically connected to the input pin IN of the conversion chip U6 through inductor L3. The pilot pin VBST of the voltage regulator chip U7 is connected to the common connection terminal between the switching pin SW of the voltage regulator chip U7 and inductor L3 through capacitor C30. The first ends of capacitors C31, C32, R33, and C29 are all connected to the common connection terminal between inductor L3 and the input pin IN of the conversion chip U6. The second ends of capacitors C31, C32, and C29 are all grounded. The second end of resistor R33 is grounded through resistor R39. The feedback pin VFB of the voltage regulator chip U7 is connected to the common connection terminal between the second end of resistor R33 and resistor R39.

[0049] The enable pin EN of the conversion chip U6 is connected together with the input pin IN of the conversion chip U6, and the ground pin GND of the conversion chip U6 is grounded; the output pin OUT of the conversion chip U6 is electrically connected to both the input terminal of the central processing unit and the input terminal of the power drive circuit; the first end of the capacitor C28 is connected to the common connection terminal between the output pin OUT of the conversion chip U6 and the input terminal of the central processing unit, and the second end of the capacitor C28 is grounded.

[0050] The beneficial effects of this invention are as follows: Under the control of the FU6812L2 central processing unit, the main control circuit provides PWM control signals to the power drive circuit, which can control the on and off times of the power switching devices in the power drive circuit, thereby adjusting the waveform and amplitude of the output voltage and current. Under the action of the PWM control signal, the power drive circuit controls its internal power switching devices to generate a three-phase AC signal, which can be used to drive the sensorless permanent magnet motor. At the same time, the power drive circuit also collects the three-phase AC signal in real time and feeds it back to the central processing unit to monitor the operating status of the sensorless permanent magnet motor in real time, so as to facilitate the real-time understanding of the working status and load of the sensorless permanent magnet motor and improve the stability and safety of the system. In the above process, the power supply circuit provides the required operating voltage to the main control circuit and the power drive circuit respectively, ensuring that each module can operate normally.

[0051] This utility model discloses a sensorless permanent magnet motor control device based on the FU6812L2. The FU6812L2 model central processing unit is highly integrated. Based on the combination of this model central processing unit and the power drive circuit, it can achieve efficient and stable control of the sensorless permanent magnet motor, reduce the number of external components and wiring complexity, and also reduce the maintenance and replacement costs of the system. It significantly reduces the cost and complexity of the motor control system and has a high cost performance. Attached Figure Description

[0052] The features and advantages of this utility model will be more clearly understood by referring to the accompanying drawings. The drawings are schematic and should not be construed as limiting the utility model in any way. In the drawings:

[0053] Figure 1 The diagram shows a structural diagram of a sensorless permanent magnet motor control device based on FU6812L2 in an embodiment of this utility model.

[0054] Figure 2 This invention presents a complete structural diagram of the sensorless permanent magnet motor control device based on FU6812L2 in an embodiment of the present invention.

[0055] Figure 3 The circuit design diagram of the three-phase inverter unit, drive unit and current sampling protection unit in the embodiment of this utility model is shown;

[0056] Figure 4 The circuit design diagram of the current acquisition sub-circuit in the three-phase current acquisition unit of this utility model embodiment is shown;

[0057] Figure 5 The circuit design diagram of the safety filter unit in an embodiment of this utility model is shown;

[0058] Figure 6 The circuit design diagram of the surge suppression rectifier unit in an embodiment of this utility model is shown;

[0059] Figure 7 The circuit design diagram of the power factor correction unit in an embodiment of this utility model is shown;

[0060] Figure 8 The circuit design diagram of the analog-to-digital conversion unit in an embodiment of this utility model is shown;

[0061] Figure 9 The circuit design diagram of the DC-DC conversion unit in an embodiment of this utility model is shown. Detailed Implementation

[0062] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0063] Example

[0064] This embodiment provides a sensorless permanent magnet motor control device based on FU6812L2, such as... Figure 1 As shown, the device includes a main control circuit, a power drive circuit, and a power supply circuit. The main control circuit includes a central processing unit of model FU6812L2.

[0065] The output terminal of the power supply circuit is electrically connected to both the input terminal of the central processing unit and the input terminal of the power drive circuit. The output terminal of the central processing unit is electrically connected to the sensorless permanent magnet motor through the power drive circuit. The output terminal of the power drive circuit is also electrically connected to the input terminal of the central processing unit, and the input terminal of the power supply circuit is also electrically connected to the output terminal of the central processing unit.

[0066] In this embodiment, under the control of the FU6812L2 central processing unit, the main control circuit provides a PWM control signal to the power drive circuit, which controls the on and off times of the power switching devices in the power drive circuit, thereby adjusting the waveform and amplitude of the output voltage and current. Under the action of the PWM control signal, the power drive circuit controls its internal power switching devices to generate a three-phase AC signal, which is used to drive the sensorless permanent magnet motor. At the same time, the power drive circuit also collects the three-phase AC signal in real time and feeds it back to the central processing unit to monitor the operating status of the sensorless permanent magnet motor in real time, so as to grasp the working status and load of the sensorless permanent magnet motor in real time, and improve the stability and safety of the system. In the above process, the power supply circuit provides the required operating voltage to the main control circuit and the power drive circuit respectively to ensure that each module can operate normally.

[0067] The sensorless permanent magnet motor control device based on FU6812L2 control in this embodiment uses a highly integrated central processing unit (CPU) of the FU6812L2 model. By combining the CPU of this model with the power drive circuit, efficient and stable control of the sensorless permanent magnet motor can be achieved, while also reducing the number of external components and wiring complexity. This also reduces the maintenance and replacement costs of the system, significantly lowering the cost and complexity of the motor control system and providing a high cost-performance ratio.

[0068] It should be understood that this utility model only improves the hardware structure of each circuit in the sensorless permanent magnet motor control device based on FU6812L2 control, thereby reducing the cost of the sensorless permanent magnet motor control device. It does not involve any improvement to the computer program. All computer programs involved are existing technologies and are pre-stored in the chip's own memory or storage area within each circuit module.

[0069] The following is a further description of each circuit module of the sensorless permanent magnet motor control device based on FU6812L2 control in this embodiment.

[0070] In this embodiment, as Figure 2 As shown, the main control circuit also includes a memory, an interface unit, and an LED indicator unit. The memory, interface unit, and LED indicator unit are all electrically connected to the central processing unit, and the interface unit is also communicatively connected to external devices.

[0071] In the aforementioned main control circuit, the memory stores the entire control system's operating program, control algorithm, parameter settings, and temporary data during operation. The interface unit communicates with external devices, enabling data exchange between the main control circuit and external devices, such as receiving sensor data and control commands from external devices, facilitating automated control of the entire system. The LED indicator unit displays the operating and fault states of the entire control system, allowing users to intuitively understand its status. The main control circuit, through the combination of the FU6812L2 central processing unit (CPU) with the aforementioned memory, interface unit, and LED indicator unit, enables more efficient and stable control of the sensorless permanent magnet motor.

[0072] Specifically, in this embodiment, the memory is a FLASH memory, and the interface unit is an RS485 interface.

[0073] In this embodiment, as Figure 2 As shown, the power drive circuit includes a three-phase inverter unit, a drive unit, and a three-phase current acquisition unit. The input terminals of the three-phase inverter unit, the drive unit, and the three-phase current acquisition unit are all electrically connected to the output terminal of the power supply circuit. The input terminal of the three-phase inverter unit is also electrically connected to the output terminal of the central processing unit. The output terminal of the three-phase inverter unit is electrically connected to the sensorless permanent magnet motor through the drive unit. The input terminal of the three-phase current acquisition unit is electrically connected to the output terminal of the drive unit, and the output terminal of the three-phase current acquisition unit is electrically connected to the input terminal of the central processing unit.

[0074] In the aforementioned power drive circuit, the three-phase inverter unit is the core of the entire module, used for the conversion of three-phase AC power. It can realize the conversion of electrical energy, ensure the quality of subsequent output voltage and current, and thus ensure the stable operation of the sensorless permanent magnet motor. The drive unit is the bridge connecting the three-phase inverter unit and the sensorless permanent magnet motor. It can amplify and shape the three-phase AC power generated by the three-phase inverter unit to provide the necessary drive voltage and current for the sensorless permanent magnet motor, driving the motor to operate within the safe operating range. The three-phase current acquisition unit then collects the three-phase AC power signal provided by the drive unit to the sensorless permanent magnet motor in real time and transmits it to the central processing unit. It can realize current sampling protection, such as overcurrent protection, to further ensure that the sensorless permanent magnet motor operates within the safe operating range.

[0075] In the power drive circuit described above, the functions of each unit are as follows:

[0076] The three-phase inverter unit receives the PWM control signal provided by the central processing unit and converts the input voltage into the three-phase AC current signal;

[0077] The drive unit receives the three-phase AC signal provided by the three-phase inverter unit, processes the three-phase AC signal, and transmits the processed three-phase AC signal to the sensorless permanent magnet motor.

[0078] The three-phase current acquisition unit acquires the processed three-phase AC signal provided by the drive unit to the sensorless permanent magnet motor in real time and transmits it to the central processing unit.

[0079] Preferably, such as Figure 3 As shown, the three-phase inverter unit includes a three-phase half-bridge driver chip U9, capacitors C44, C46, ​​C48, C50, and C54, and resistors R57, R58, R59, R60, R63, R64, R65, R66, R67, R71, and R72.

[0080] The low-side power supply pin VCC of the three-phase half-bridge driver chip U9 is electrically connected to the output terminal of the power supply circuit. The power ground pin VSS and the low-side gate drive pin COM of the three-phase half-bridge driver chip U9 are both grounded. The first end of capacitor C44 is connected to the common connection between the low-side power supply pin VCC of the three-phase half-bridge driver chip U9 and the output terminal of the power supply circuit, and the second end of capacitor C44 is grounded. The first high-side signal input pin HIN1 of the three-phase half-bridge driver chip U9 is electrically connected to the output terminal of the central processing unit through resistor R57, and the second high-side signal input pin HIN2 of the three-phase half-bridge driver chip U9 is electrically connected to the output terminal of the central processing unit through resistor R57. Resistor R58 is electrically connected to the output terminal of the central processing unit. The third high-side signal input pin HIN3 of the three-phase half-bridge driver chip U9 is electrically connected to the output terminal of the central processing unit through resistor R59. The first low-side signal input pin LIN1 of the three-phase half-bridge driver chip U9 is electrically connected to the output terminal of the central processing unit through resistor R60. The second low-side signal input pin LIN2 of the three-phase half-bridge driver chip U9 is electrically connected to the output terminal of the central processing unit through resistor R63. The third low-side signal input pin LIN3 of the three-phase half-bridge driver chip U9 is electrically connected to the output terminal of the central processing unit through resistor R65.

[0081] The fault indication pin FAULT of the three-phase half-bridge driver chip U9 is electrically connected to the output terminal of the central processing unit through resistor R67. The first end of resistor R64 is connected to the common connection terminal between resistor R67 and the output terminal of the central processing unit, and the second end of resistor R64 is electrically connected to the output terminal of the power supply circuit. The enable pin EN of the three-phase half-bridge driver chip U9 is electrically connected to the output terminal of the central processing unit through resistor R71. The external RC input pin RCIN of the three-phase half-bridge driver chip U9 is electrically connected to the output terminal of the power supply circuit through resistor R72. The first end of capacitor C50 is connected to the common connection terminal between the external RC input pin RCIN of the three-phase half-bridge driver chip U9 and resistor R72, and the second end of capacitor C50 is grounded.

[0082] The first high-side floating absolute voltage pin VB1 of the three-phase half-bridge driver chip U9 is electrically connected to the input terminal of the driver unit through capacitor C46. The second high-side floating absolute voltage pin VB2 of the three-phase half-bridge driver chip U9 is electrically connected to the input terminal of the driver unit through capacitor C48. The third high-side floating absolute voltage pin VB3 of the three-phase half-bridge driver chip U9 is electrically connected to the input terminal of the driver unit through capacitor C54. The first high-side floating offset voltage pins VS1, VS2, VS3, HO1, HO2, HO3, LO1, LO2, and LO3 of the three-phase half-bridge driver chip U9 are all electrically connected to the input terminal of the driver unit.

[0083] In the aforementioned three-phase inverter unit, the three-phase half-bridge driver chip U9 with enable and fault detection is used as the inverter core. It can not only control the three half-bridge circuits simultaneously and provide accurate three-phase AC signals to ensure that the sensorless permanent magnet motor in the downstream stage can operate normally according to the control commands, but also effectively monitor various abnormal situations during the motor drive process, enabling the entire control system to respond and handle faults in a timely manner, ensuring the safe operation of the entire control system. Based on the enable control and fault detection of the three-phase half-bridge driver chip, the reliability and efficiency of the system can be effectively increased, and the motor and drive circuit can be protected.

[0084] Specifically, in Figure 3 In the middle, the three-phase half-bridge driver chip U9 with enable and fault detection specifically adopts the NSG2136 model three-phase half-bridge IGBT driver chip. The three high-side signal input pins HN1~HN3, the three low-side signal input pins LN1~LN3, the fault indication pin FAULT, and the enable pin EN of this chip are all connected to the FU6812L2 model central processing unit.

[0085] Other resistors and capacitors in the three-phase inverter unit should be selected according to the actual situation, and will not be listed here.

[0086] Preferably, such as Figure 3 As shown, the driving unit includes MOSFETs Q5, Q6, Q7, Q8, Q9, and Q10; diodes D15, D16, D17, D18, D22, and D23; capacitors C47, C49, C51, C52, C57, and C58; and resistors R55, R56, R61, R66, R70, R74, R75, R78, R79, R81, R87, R88, R90, R91, and R92.

[0087] The drains of MOSFETs Q5, Q7, and Q9 are all electrically connected to the output terminal of the power supply circuit. The source of MOSFET Q5 is electrically connected to the drain of MOSFET Q6, the source of MOSFET Q7 is electrically connected to the drain of MOSFET Q8, and the source of MOSFET Q9 is electrically connected to the drain of MOSFET Q10. The source of MOSFET Q6 is grounded through resistor R70, the source of MOSFET Q8 is grounded through resistor R81, and the source of MOSFET Q10 is grounded through resistor R92. The source of MOSFET Q5... The common connection terminals between the drain of MOSFET Q6, Q7 and Q8, and Q9 and Q10 are all electrically connected to the inductive permanent magnet motor; the common connection terminals between the source of MOSFET Q6 and resistor R70, Q8 and R81, and Q10 and R92 are all electrically connected to the input terminal of the three-phase current acquisition unit.

[0088] The base of MOSFET Q5 is electrically connected to the output terminal of the three-phase inverter unit through resistor R55. The first end of resistor R56, the first end of capacitor C47, and the anode of diode D15 are all connected to the common connection between the base of MOSFET Q5 and resistor R55. The second end of resistor R56 and the second end of capacitor C47 are all connected to the common connection between the source of MOSFET Q5 and the drain of MOSFET Q6. The cathode of diode D15 is electrically connected to the output terminal of the three-phase inverter unit. The base of MOSFET Q6 is electrically connected to the output terminal of the three-phase inverter unit through resistor R61. The first end of resistor R66, the first end of capacitor C49, and the anode of diode D16 are all connected to the common connection between the base of MOSFET Q6 and resistor R61. The second end of resistor R66 and the second end of capacitor C49 are all connected to the common connection between the source of MOSFET Q6 and resistor R70. The cathode of diode D16 is electrically connected to the output terminal of the three-phase inverter unit.

[0089] The base of MOSFET Q7 is electrically connected to the output terminal of the three-phase inverter unit through resistor R74. The first end of resistor R75, the first end of capacitor C51, and the anode of diode D17 are all connected to the common connection terminal between the base of MOSFET Q7 and resistor R74. The second end of resistor R75 and the second end of capacitor C51 are both connected to the common connection terminal between the source of MOSFET Q7 and the drain of MOSFET Q8. The cathode of diode D17 is electrically connected to the output terminal of the three-phase inverter unit. The base of MOSFET Q8 is electrically connected to the output terminal of the three-phase inverter unit through resistor R78. The first end of resistor R79, the first end of capacitor C52, and the anode of diode D18 are all connected to the common connection terminal between the base of MOSFET Q8 and resistor R78. The second end of resistor R79 and the second end of capacitor C52 are both connected to the common connection terminal between the source of MOSFET Q8 and resistor R81. The cathode of diode D18 is electrically connected to the output terminal of the three-phase inverter unit.

[0090] The base of MOSFET Q9 is electrically connected to the output terminal of the three-phase inverter unit through resistor R87. The first end of resistor R88, the first end of capacitor C57, and the anode of diode D22 are all connected to the common connection between the base of MOSFET Q9 and resistor R87. The second end of resistor R88 and the second end of capacitor C57 are both connected to the common connection between the source of MOSFET Q9 and the drain of MOSFET Q10. The cathode of diode D22 is electrically connected to the output terminal of the three-phase inverter unit. The base of MOSFET Q10 is electrically connected to the output terminal of the three-phase inverter unit through resistor R90. The first end of resistor R91, the first end of capacitor C58, and the anode of diode D23 are all connected to the common connection between the base of MOSFET Q10 and resistor R90. The second end of resistor R91 and the second end of capacitor C58 are both connected to the common connection between the source of MOSFET Q10 and resistor R92. The cathode of diode D23 is electrically connected to the output terminal of the three-phase inverter unit.

[0091] In the drive unit with the above structure, the main architecture of the entire drive unit is composed of 6 MOSFETs, which can effectively reduce the power consumption of the entire drive unit, and the switching speed is fast, enabling the entire motor control system to operate more efficiently, and reducing the complexity and cost of the drive circuit.

[0092] Specifically, Figure 3 In this circuit, MOSFETs Q5, Q6, Q7, Q8, Q9, and Q10 are all NMOS transistors. The common connection between the source of MOSFET Q5 and the drain of MOSFET Q6 outputs a U-phase voltage signal, which is electrically connected to the U-phase input of the sensorless permanent magnet motor. The common connection between the source of MOSFET Q7 and the drain of MOSFET Q8 outputs a V-phase voltage signal, which is electrically connected to the V-phase input of the sensorless permanent magnet motor. The common connection between the source of MOSFET Q9 and the drain of MOSFET Q10 outputs a W-phase voltage signal, which is electrically connected to the W-phase input of the sensorless permanent magnet motor. The common connection between the source of MOSFET Q6 and resistor R70 is connected to the circuit input terminal of the three-phase current acquisition unit used for acquiring the U-phase current (specifically...). Figure 3 The ICCU port is electrically connected, and the common connection between the source of MOSFET Q8 and resistor R81 is connected to the circuit input terminal of the three-phase current acquisition unit used to acquire the V-phase current (specifically...). Figure 3 The ICCV port is electrically connected, and the common connection between the source of MOSFET Q10 and resistor R92 is connected to the circuit input terminal of the three-phase current acquisition unit used to acquire the W-phase current (specifically...). Figure 3 Electrical connection to the ICCW port.

[0093] Specifically, Figure 3In this configuration, the base of MOSFET Q5 is electrically connected to the first high-side output pin HO1 of the NSG2136 three-phase half-bridge IGBT driver chip via resistor R55; the base of MOSFET Q7 is electrically connected to the second high-side output pin HO2 of the NSG2136 three-phase half-bridge IGBT driver chip via resistor R74; and the base of MOSFET Q9 is electrically connected to the third high-side output pin HO3 of the NSG2136 three-phase half-bridge IGBT driver chip via resistor R87. The base of MOSFET Q6 is electrically connected to the first low-side output pin LO1 of the NSG2136 three-phase half-bridge IGBT driver chip via resistor R61; the base of MOSFET Q8 is electrically connected to the second low-side output pin LO2 of the NSG2136 three-phase half-bridge IGBT driver chip via resistor R78; and the base of MOSFET Q10 is electrically connected to the third low-side output pin LO3 of the NSG2136 three-phase half-bridge IGBT driver chip via resistor R90.

[0094] The common connection between the source of MOSFET Q5 and the drain of MOSFET Q6 is directly connected to the first high-side floating offset voltage pin VS1 of the NSG2136 three-phase half-bridge IGBT driver chip on one hand, and to the first high-side floating absolute voltage pin VB1 of the NSG2136 three-phase half-bridge IGBT driver chip on the other hand through capacitor C46; the common connection between the source of MOSFET Q7 and the drain of MOSFET Q8 is directly connected to the second high-side floating offset voltage pin of the NSG2136 three-phase half-bridge IGBT driver chip on one hand. The voltage pin VS2 is electrically connected, and on the other hand, it is electrically connected to the second high-side floating absolute voltage pin VB2 of the NSG2136 three-phase half-bridge IGBT driver chip through capacitor C48; the common connection terminal between the source of MOSFET Q9 and the drain of MOSFET Q10 is directly connected to the third high-side floating offset voltage pin VS3 of the NSG2136 three-phase half-bridge IGBT driver chip, and on the other hand, it is electrically connected to the third high-side floating absolute voltage pin VB3 of the NSG2136 three-phase half-bridge IGBT driver chip through capacitor C54.

[0095] Similarly, the appropriate models or specifications of resistors, capacitors and diodes in the drive unit should be selected according to the actual situation, and will not be listed here.

[0096] Preferably, the three-phase current acquisition unit includes three current acquisition sub-circuits;

[0097] like Figure 4As shown, each of the current acquisition sub-circuits includes an operational amplifier, a first capacitor, a second capacitor, a third capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, and an eleventh resistor.

[0098] In each current acquisition sub-circuit, the positive power supply pin of the operational amplifier is electrically connected to the output terminal of the power supply circuit, and the negative power supply pin of the operational amplifier is grounded; the positive input pin of the operational amplifier is electrically connected to the output terminal of the driving unit through the sixth resistor and the fifth resistor in sequence, and the inverting input pin of the operational amplifier is grounded through the ninth resistor and the eighth resistor in sequence; the first end of the first capacitor is connected to the common connection terminal between the sixth resistor and the fifth resistor, and the second end of the first capacitor is connected to the common connection terminal between the ninth resistor and the eighth resistor;

[0099] The positive input pin of the operational amplifier is also electrically connected to the output terminal of the power supply circuit through the third resistor and the first resistor in sequence. The first end of the second resistor and the first end of the fourth resistor are both connected to the common connection terminal between the third resistor and the first resistor. The second end of the second resistor is grounded, and the second end of the fourth resistor is connected to the common connection terminal between the positive input pin of the operational amplifier and the third resistor.

[0100] The output pin of the op-amp is electrically connected to the input terminal of the central processing unit through the seventh resistor. The first end of the tenth resistor, the first end of the eleventh resistor, and the first end of the third capacitor are all connected to the common connection terminal between the inverting input pin of the op-amp and the ninth resistor. The second end of the tenth resistor, the second end of the eleventh resistor, and the second end of the third capacitor are all connected to the common connection terminal between the output pin of the op-amp and the seventh resistor. The first end of the second capacitor is connected to the common connection terminal between the seventh resistor and the input terminal of the central processing unit, and the second end of the second capacitor is grounded.

[0101] In the aforementioned three-phase current acquisition unit, three-phase current acquisition sub-circuits operating with rail-to-rail input and output are used to acquire and amplify the three-phase current. This expands the signal range, enabling the entire control system to handle a wider range of current variations and broaden its adaptability. Furthermore, it provides a higher dynamic range when processing three-phase current signals, allowing for more accurate capture and amplification of minute changes in the three-phase current signal, thus improving sampling precision and accuracy. In addition, the wide input / output voltage range of the rail-to-rail operational amplifiers reduces the need for external circuits such as level conversion circuits and limiting circuits, thereby reducing circuit complexity and cost while improving system reliability and stability.

[0102] It should be understood that Figure 4The diagram only shows the circuit diagram of one current acquisition sub-circuit (specifically the U-phase current acquisition sub-circuit). The circuit structures of the other two current acquisition sub-circuits are the same and will not be shown here.

[0103] Specifically, in Figure 4 In the current acquisition sub-circuit shown, the operational amplifier is specifically... Figure 4 In the op-amp U4A, the first, second, and third capacitors are specifically respectively... Figure 4 C5, C6, and C8, and the first, second, third, fourth, fifth, sixth, seventh, eighth, ninth, tenth, and eleventh resistors are specifically as follows: Figure 4 Resistors R7, R8, R9, R10, R11, R12, R14, R15, R16, R17, and R18 are specified in the code. The positive input pin of operational amplifier U4A is connected to the output terminal of the drive unit (specifically, R12 and R11) via resistors R7 and R8. Figure 3 The source of MOSFET Q6 is electrically connected to the common connection terminal between resistor R70 and the MOSFET Q6. The output pin of op-amp U4A is electrically connected to the input terminal (specifically the ADCU port) of the central processing unit through the seventh resistor (specifically resistor R14).

[0104] Furthermore, such as Figure 2 As shown, the power drive circuit further includes a current sampling protection unit. The input terminal of the current sampling protection unit is electrically connected to the output terminal of the drive unit and the output terminal of the power supply circuit. The output terminal of the current sampling protection unit is electrically connected to the input terminal of the central processing unit.

[0105] By directly setting a current sampling protection unit in the power drive circuit for current sampling protection, the current status of the three outputs can be effectively monitored in real time. Once an abnormal current occurs (such as overcurrent, short circuit, etc.), it can respond immediately and take measures, such as cutting off the power supply or adjusting the output, to prevent damage to power devices, loads, or the entire system due to overcurrent, greatly improving the safety of the system. Monitoring the current of the three outputs separately allows for more precise control and adjustment of the current, improving the stability of the system.

[0106] The functions of the aforementioned current sampling protection unit are as follows:

[0107] The current sampling protection unit receives the processed three-phase AC signal output by the drive unit and performs current sampling protection based on the processed three-phase AC signal.

[0108] Preferably, such as Figure 3As shown, the current sampling protection unit includes an operational amplifier U4B, diodes D19, D20, and D21, capacitors C53, C55, and C56, and resistors R76, R77, R80, R82, R83, R84, R85, and R86.

[0109] The positive power supply pin of the operational amplifier U4B is electrically connected to the output terminal of the power supply circuit. The first end of the capacitor C55 is connected to the common connection terminal between the positive power supply pin of the operational amplifier U4B and the output terminal of the power supply circuit, and the second end of the capacitor C55 is grounded. The negative power supply pin of the operational amplifier U4B is grounded.

[0110] The positive input pin of operational amplifier U4B is grounded through resistor R76; the first ends of resistors R80, R82, and R84 are all electrically connected to the output of the drive unit; the second end of resistor R80 is electrically connected to the positive input pin of operational amplifier U4B through diode D19; the second end of resistor R82 is electrically connected to the positive input pin of operational amplifier U4B through diode D20; and the second end of resistor R84 is electrically connected to the positive input pin of operational amplifier U4B through diode D21. The negative input pin of operational amplifier U4B is grounded through capacitor C56; the first ends of resistors R85 and R86 are both connected to the common connection between the negative input pin of operational amplifier U4B and capacitor C56; the second end of resistor R85 is electrically connected to the output of the power supply circuit; and the second end of resistor R86 is grounded.

[0111] The output pin of the operational amplifier U4B is electrically connected to the input terminal of the central processing unit through resistor R77. The first end of resistor R83 and the first end of capacitor C53 are both connected to the common connection terminal between the output pin of operational amplifier U4B and resistor R77. The second end of resistor R83 and the second end of capacitor C53 are both grounded.

[0112] In the current sampling protection unit with the above structure, the first ends of resistors R80, R82, and R84 are all electrically connected to the output terminal of the drive unit. The second end of resistor R80 is electrically connected to the positive input pin of operational amplifier U4B through diode D19. The second end of resistor R82 is electrically connected to the positive input pin of operational amplifier U4B through diode D20. The second end of resistor R84 is electrically connected to the positive input pin of operational amplifier U4B through diode D21. The sampling and protection of the first current (such as the U-phase current) can be achieved through resistor R80 and diode D19, the sampling and protection of the second current (such as the V-phase current) can be achieved through resistor R82 and diode D20, and the sampling and protection of the third current (such as the W-phase current) can be achieved through resistor R84 and diode D21. This achieves the sampling and protection of three-phase currents simultaneously with a simple circuit design structure. The entire structure is simple and low in cost.

[0113] Similarly, in this embodiment Figure 3 The current sampling protection unit shown and Figure 4 Each component in the current acquisition sub-circuit shown can be selected according to the actual situation, and there are no restrictions here.

[0114] In this embodiment, as Figure 2 As shown, the power supply circuit includes a safety filter unit, a surge suppression rectifier unit, a power factor correction unit, an analog-to-digital converter unit, and a DC-DC converter unit;

[0115] The input terminal of the safety filter unit is electrically connected to an external power supply. The output terminal of the safety filter unit is electrically connected to the input terminal of the DC-DC converter unit via the surge suppression rectification unit, the power factor correction unit, the analog-to-digital converter unit, and the DC-DC converter unit in sequence. The output terminals of the power factor correction unit, the analog-to-digital converter unit, and the DC-DC converter unit are all electrically connected to the input terminal of the power drive circuit. The output terminal of the DC-DC converter unit is also electrically connected to the input terminal of the central processing unit. The input terminals of the surge suppression rectification unit and the power factor correction unit are also electrically connected to the output terminal of the central processing unit.

[0116] In the entire power supply circuit, the external power supply is first connected through a safety filter unit, which ensures the electrical safety of the external power supply and filters out high-frequency noise and interference from the power grid. After filtering, this unit obtains a clean and stable AC voltage signal, which is then input into the surge suppression rectifier unit. The surge suppression rectifier unit suppresses surge voltage and transient overvoltage in the power grid, protecting the subsequent circuits from damage. Through rectification, the input AC voltage signal is rectified into a DC voltage signal. Then, the power factor correction unit performs power factor correction, which can improve the power factor of the power supply voltage, reduce reactive power loss in the power grid, and reduce harmonic pollution. The subsequent analog-to-digital conversion unit receives the DC voltage signal processed by the power factor correction unit, performs analog-to-digital conversion on it, and obtains a digital voltage signal, which facilitates subsequent digital control and processing. Finally, the DC-DC conversion unit converts the first digital voltage signal with a first voltage value into a second digital voltage signal with a second voltage value, which facilitates the power supply needs of the subsequent circuits. The power supply circuit with the above architecture can ensure the efficient, stable and reliable operation of the power supply, ensure that the subsequent circuits receive a stable and safe voltage signal, and meet the precise power supply requirements of each circuit.

[0117] In the above power supply circuit, the functions of each unit are as follows:

[0118] The safety filter unit receives the power supply voltage provided by an external power source and performs filtering processing on the power supply voltage;

[0119] The surge suppression rectifier unit receives the filtered power supply voltage provided by the safety filter unit and rectifies the filtered power supply to obtain a DC voltage signal.

[0120] The power factor correction unit receives the DC voltage signal provided by the surge suppression rectifier unit and performs power factor correction on the DC voltage signal; the power factor corrected DC voltage signal is then provided to the analog-to-digital converter unit and the power drive circuit respectively.

[0121] The analog-to-digital conversion unit receives the DC voltage signal after power factor correction and performs analog-to-digital conversion on the DC voltage signal after power factor correction to obtain a first digital voltage signal with a first voltage value; the first digital voltage signal with the first voltage value is provided to the DC-DC conversion unit and the power drive circuit respectively.

[0122] The DC-DC conversion unit receives the first digital voltage signal having a first voltage value and converts the first digital voltage signal having a first voltage value into a second digital voltage signal having a second voltage value; the second digital voltage signal having a second voltage value is provided to the central processing unit and the power drive circuit respectively.

[0123] Preferably, such as Figure 5 As shown, the safety filter unit includes a common-mode inductor FL1, a fuse F1, capacitors CX1, CX2, CY2, CY3, resistors R62, R68, R69, and R73.

[0124] Pin 2 of common mode inductor FL1 is electrically connected to the positive signal terminal of the external power supply through fuse F1, and pin 1 of common mode inductor FL1 is electrically connected to the negative signal terminal of the external power supply. The first end of resistor R68 and the first end of capacitor CX1 are both connected to the common connection terminal between pin 2 of common mode inductor FL1 and fuse F1. The second end of resistor R68 and the second end of capacitor CX1 are both connected to the common connection terminal between pin 1 of common mode inductor FL1 and the negative signal terminal of the external power supply.

[0125] Pins 3 and 4 of the common-mode inductor FL1 are electrically connected to the input terminal of the surge suppression rectifier unit. The first terminals of capacitors CX2 and CY2 are connected to the common connection terminal between pin 3 of the common-mode inductor FL1 and the input terminal of the surge suppression rectifier unit. The second terminal of capacitor CY2 is grounded. The second terminal of capacitor CX2 and the first terminal of capacitor CY3 are connected to the common connection terminal between pin 4 of the common-mode inductor FL1 and the input terminal of the surge suppression rectifier unit. The second terminal of capacitor CY3 is grounded. The first terminal of resistor R62 is connected to the common connection terminal between pin 3 of the common-mode inductor FL1 and the input terminal of the surge suppression rectifier unit. The second terminal of resistor R62 is connected to the common connection terminal between pin 4 of the common-mode inductor FL1 and the input terminal of the surge suppression rectifier unit through resistors R69 and R73 in sequence.

[0126] In the safety filter unit described above, fuse F1 can quickly disconnect the circuit in case of overload or short circuit, preventing overcurrent damage to various modules in the control system. Resistor R68 is a varistor that senses voltage changes in the circuit. When the voltage exceeds a certain threshold, the resistance of the varistor will rapidly decrease, thereby diverting excessive current and preventing damage to components in the circuit due to overvoltage. Two X capacitors (CX1 and CX2) are connected between the positive signal terminal (specifically, the live wire) and the negative signal terminal (specifically, the neutral wire) of the external power supply, which can suppress differential-mode interference. Two Y capacitors (CY2 and CY3) are connected between the positive signal terminal (specifically, the live wire) and ground, and between the negative signal terminal (specifically, the neutral wire) and ground, which can suppress common-mode interference. Based on these four capacitors, the filtering effect of the circuit can be significantly improved. The common-mode inductor FL1 effectively filters out common-mode electromagnetic interference on signal lines and prevents itself from emitting electromagnetic interference. The four capacitors, combined with FL1, form a more complete filtering network, further optimizing the filtering effect. Resistors R62, R69, and R73 form a discharge resistor structure, limiting current in the circuit and preventing damage due to excessive current. This safety filter unit not only effectively improves the anti-interference capability and stability of the control system but also has a compact structure and high integration, effectively saving design space and reducing costs.

[0127] Preferably, such as Figure 6 As shown, the surge suppression rectifier unit includes a relay K1, a bridge rectifier diode D3, a diode D4, a transistor Q2, resistors R1, R6, R9, R10, and R58.

[0128] The first input pin of the bridge rectifier diode D3 is electrically connected to the first output terminal of the safety filter unit through resistor R1, and the second input pin of the bridge rectifier diode D3 is electrically connected to the second output terminal of the safety filter unit; both the first and second output pins of the bridge rectifier diode D3 are electrically connected to the input terminal of the power factor correction unit.

[0129] The first terminal of the relay K1 coil is electrically connected to the +15V power supply terminal, and the second terminal of the relay K1 coil is electrically connected to the collector of transistor Q2 through resistor R6. The anode of diode D4 and the first terminal of resistor R58 are both connected to the common connection between the second terminal of the relay K1 coil and resistor R6. The cathode of diode D4 is connected to the common connection between the first terminal of the relay K1 coil and the +15V power supply terminal, and the second terminal of resistor R58 is connected to the common connection between resistor R6 and the collector of transistor Q2. The base of transistor Q2 is electrically connected to the output terminal of the central processing unit through resistor R9. The first end of resistor R10 is connected to the common connection terminal between the base of transistor Q2 and resistor R9, and the second end of resistor R10 is grounded. The emitter of transistor Q2 is grounded. The stationary contact of relay K1 is connected to the common connection terminal between the first input pin of bridge rectifier diode D3 and resistor R1. The first moving contact of relay K1 is connected to the common connection terminal between resistor R1 and the first output terminal of the safety filter unit. The second moving contact of relay K1 is floating.

[0130] In the surge suppression rectifier unit with the above structure, resistor R1 is a power resistor. At the instant the module is powered on, the stationary contact of relay K1 (i.e., Figure 6 Contact 5) is connected to its second moving contact, which is in a floating state. Therefore, the power resistor can be used for charging, effectively limiting the surge current and preventing damage to the circuit and equipment due to excessive current. After charging stabilizes, the central processing unit controls relay K1 to switch the stationary contact to connect with the first moving contact, short-circuiting the power resistor R1. This avoids continuous energy consumption by the resistor in the circuit, improving the overall system efficiency. Based on the precise switching of relay K1, the circuit achieves a good balance between surge suppression and energy saving, improving system stability and reliability. The intelligent control of relay K1 is implemented using transistor Q2, which has a fast response speed and high control precision, ensuring accurate and reliable switching action of relay K1. The circuit structure is simple, has low energy consumption, and is easy to implement. Furthermore, in the surge suppression rectifier unit of the above structure, bridge rectifier diode D3 performs rectification, exhibiting excellent rectification efficiency and effect.

[0131] Specifically, in Figure 6 In the surge suppression rectifier unit shown, the base of transistor Q2 is electrically connected to the output terminal of the central processing unit (specifically the R_DELAY port) through resistor R9. This surge suppression rectifier unit can rectify the external power supply voltage into a 310V DC voltage signal.

[0132] Preferably, such as Figure 7As shown, the power factor correction unit includes a power factor correction chip U8, MOSFETs Q1 and Q3, transistor Q4, inductor L1, Schottky diodes D4, D3, D10, and D11, a unidirectional diode D13, capacitors CY1, C22, C23, C24, C25, C26, C27, C36, C37, and C38. 8. Capacitors C39, C40, C41, C42, C43, and C45; Resistors R27, R29, R30, R31, R32, R34, R35, R37, R38, R40, R41, R44, R46, R47, R48, R49, R51, R52, R53, and R54;

[0133] The first terminal of inductor L1 is electrically connected to the first output terminal of the surge suppression rectifier unit. The second terminal of inductor L1 is electrically connected to both the input terminal of the analog-to-digital converter unit and the input terminal of the power drive circuit via Schottky diode D4. The anode of diode D3 and the first terminal of capacitor CY1 are both connected to the common connection between the first terminal of inductor L1 and the first output terminal of the surge suppression rectifier unit. The cathode of diode D3 is connected to the common connection between Schottky diode D4 and the input terminal of the analog-to-digital converter unit. The second terminal of capacitor CY1 is electrically connected to the second output terminal of the surge suppression rectifier unit. Capacitor C... The first terminal of capacitor C22, the first terminal of capacitor C23, the positive terminals of polarized capacitors C24, C25, and C26 are all connected to the common connection terminal between Schottky diode D4 and the input terminal of the analog-to-digital converter unit. The second terminals of capacitors C22, C23, C24, C25, and C26 are all grounded. The negative terminal of diode D11 and the first terminal of resistor R32 are both electrically connected to the second output terminal of the surge suppression rectifier unit. The positive terminal of diode D11 and the second terminal of resistor R32 are both grounded.

[0134] The source of MOSFET Q1 is connected to the common connection between the second terminal of inductor L1 and Schottky diode D4. The drain of MOSFET Q1 is grounded. The gate of MOSFET Q1 is electrically connected to the gate driver chip GATE of power factor correction chip U8 through resistor R29. The anode of diode D10, the first terminal of resistor R27, and the first terminal of capacitor C27 are all connected to the common connection between the gate of MOSFET and resistor R29. The cathode of diode D10 is connected to the common connection between resistor R29 and the gate driver chip GATE of power factor correction chip U8. The second terminals of resistor R27 and capacitor C27 are both grounded.

[0135] The inductor current detection pin ISENSE of the power factor correction chip U8 is electrically connected to the second output terminal of the surge suppression rectifier unit through resistor R44. The first terminal of capacitor C38 is connected to the common connection terminal between the inductor current detection pin ISENSE of the power factor correction chip U8 and resistor R44, and the second terminal of capacitor C38 is grounded. The ground pin GND of the power factor correction chip U8 is grounded, the current loop compensation pin ICOMP of the power factor correction chip U8 is grounded through capacitor C36, and the frequency setting pin FREQ of the power factor correction chip U8 is grounded through resistor R46. The power supply pin VCC of the power factor correction chip U8 is grounded through capacitor C43, and the first terminal of capacitor C42 is connected to the power supply pin of the power factor correction chip U8. The common connection between VCC and capacitor C43 is used, and the second terminal of capacitor C42 is grounded. The output voltage detection pin VSENSE of the power factor correction chip U8 is grounded through resistor R49. The first terminal of capacitor C39 and the first terminal of resistor R48 are both connected to the common connection between the output voltage detection pin VSENSE of the power factor correction chip U8 and resistor R49. The second terminal of capacitor C39 and the second terminal of resistor R48 are both grounded. The voltage loop compensation pin VCOMP of the power factor correction chip U8 is grounded through resistor R47 and capacitor C41 in sequence. The first terminal of capacitor C40 is connected to the common connection between the voltage loop compensation pin VCOMP of the power factor correction chip U8 and resistor R47. The second terminal of capacitor C40 is grounded.

[0136] The gate of MOSFET Q3 is electrically connected to the collector of transistor Q4 through resistor R52. The source of MOSFET Q3 is electrically connected to the +15V power supply terminal. The first end of resistor R51 is connected to the common connection between the source of MOSFET Q3 and the +15V power supply terminal. The second end of resistor R51 is connected to the common connection between the gate of MOSFET Q3 and resistor R52. The drain of MOSFET Q3 is connected to the common connection between the power supply pin VCC of power factor correction chip U8 and capacitor C43. The base of transistor Q4 is electrically connected to the output terminal of the central processing unit through resistor R53. The first end of resistor R54 and the first end of capacitor C45 are both connected to the common connection between the base of transistor Q4 and resistor R53. The second end of resistor R54 and the second end of capacitor C45 are both grounded. The emitter of transistor Q4 is grounded.

[0137] The first ends of resistors R30 and R31 are both connected to the common connection between Schottky diode D4 and the input terminal of the analog-to-digital converter unit; the second end of resistor R30 is connected in sequence through resistors R34, R37, and R41 to the common connection between the output voltage detection pin VSENSE of the power factor correction chip U8 and resistor R49; the second end of resistor R31 is electrically connected to the input terminal of the power drive circuit in sequence through resistors R35 and R38; the first end of resistor R40 and the first end of capacitor C37 are both connected to the common connection between resistor R38 and the input terminal of the power drive circuit, and the second ends of resistor R40 and capacitor C37 are both grounded;

[0138] The unidirectional diode D13 includes a first sub-diode and a second sub-diode; wherein, the cathode of the first sub-diode is connected together with the anode of the second sub-diode and connected to the common connection terminal between resistor R38 and the input terminal of the power drive circuit; the anode of the first sub-diode is grounded, and the cathode of the second sub-diode is electrically connected to the +3.3V power supply terminal.

[0139] In the power factor correction unit of the above structure, the voltage output from the surge suppression rectifier unit (specifically a 310V DC voltage signal) can be boosted to the stable DC voltage signal (specifically a 380V DC voltage signal) required by the subsequent circuits (specifically the analog-to-digital conversion unit and the drive unit in the power drive circuit), ensuring the normal operation of the control system. The entire circuit adopts efficient PFC power correction technology, which can significantly reduce the loss of ineffective power, improve energy efficiency, reduce harmonic components in the current, and improve the quality and stability of the power grid. The circuit structure is simple, reliable, and low in cost.

[0140] exist Figure 7In the power factor correction unit shown, the first end of the inductor L1 is electrically connected to the first output terminal (specifically the DC+ port) of the surge suppression rectifier unit, and the second end of the capacitor CY1 is electrically connected to the second output terminal (specifically the DC- port) of the surge suppression rectifier unit; the base of the transistor Q4 is electrically connected to the output terminal of the central processing unit (specifically the EN_PFC port) through the resistor R53.

[0141] Preferably, such as Figure 8 As shown, the analog-to-digital conversion unit includes a power management chip U5, an inductor L2, diodes D5, D7, D8, a light-emitting diode D9, capacitors C16, C18, C19, C20, C21, a polarized capacitor C17, and resistors R24, R25, R26, and R28.

[0142] The drain pin DRAIN of the power management chip U5 is electrically connected to the output terminal of the power factor correction unit. The first end of the capacitor C16 is connected to the common connection terminal between the drain pin DRAIN of the power management chip U5 and the output terminal of the power factor correction unit, and the second end of the capacitor C16 is grounded. The ground pin GND of the power management chip U5 is electrically connected to the input terminal of the DC-DC conversion unit and the input terminal of the power drive circuit through the inductor L2. The unused pin NC of the power management chip U5 is connected to the common connection terminal between the ground pin GND of the power management chip U5 and the inductor L2.

[0143] The anode of diode D7 is connected to the common connection between inductor L2 and the input terminal of the DC-DC conversion unit. The cathode of diode D7 is connected to the common connection between the ground pin GND of power management chip U5 and inductor L2 via diode D8 and capacitor C18. The first terminals of resistor R24 ​​and capacitor C19 are both connected to the common connection between the ground pin GND of power management chip U5 and inductor L2. The second terminal of resistor R24 ​​is connected to the common connection between the cathode of diode D7 and diode D8 via resistor R28. The second terminal of capacitor C19 is also connected to the common connection between the cathode of diode D7 and diode D8. The power supply pin VCC of power management chip U5 is connected to the common connection between diode D8 and capacitor C18. The error amplifier input pin EA-IN of power management chip U5 is connected to the common connection between the second terminal of resistor R24 ​​and resistor R28.

[0144] The first terminals of capacitors C20 and C21 are both connected to the common connection between the ground pin GND of power management chip U5 and inductor L2. The second terminal of capacitor C20 is electrically connected to the error amplifier output pin EA-OUT of power management chip U5. The second terminal of capacitor C21 is connected to the common connection between the second terminal of capacitor C20 and the error amplifier output pin EA-OUT of power management chip U5 through resistor R26. The negative terminal of diode D5 is connected to the common connection between the ground pin GND of power management chip U5 and inductor L2, and the positive terminal of diode D5 is grounded. The positive terminal of polarized capacitor C17 and the first terminal of resistor R25 are both connected to the common connection between inductor L2 and the input terminal of the DC-DC conversion unit. The negative terminal of polarized capacitor C17 is grounded, and the second terminal of resistor R25 is grounded through light-emitting diode D9.

[0145] The analog-to-digital converter unit described above can efficiently convert a power factor corrected DC voltage signal (specifically a 380V DC voltage signal) into a 15V digital voltage signal using non-isolation technology, and provide it to the subsequent circuits (including the DC-DC conversion unit and the three-phase inverter unit in the power drive circuit). It has a simple structure and low cost.

[0146] Preferably, such as Figure 9 As shown, the DC-DC conversion unit includes a voltage regulator chip U7, a conversion chip U6, an inductor L3, capacitors C28, C29, C30, C31, C32, C33, C34, C35, a resistor R33, and a resistor R39.

[0147] The power supply pin VIN of the voltage regulator chip U7 is connected to the enable pin EN, and is electrically connected to the output of the analog-to-digital converter unit. The first ends of capacitors C33, C34, and C35 are all connected to the common connection point between the power supply pin VIN of the voltage regulator chip U7 and the output of the analog-to-digital converter unit. The second ends of capacitors C33, C34, and C35 are all grounded. The ground pin GND of the voltage regulator chip U7 is grounded.

[0148] The switching pin SW of the voltage regulator chip U7 is electrically connected to the input pin IN of the conversion chip U6 through inductor L3. The pilot pin VBST of the voltage regulator chip U7 is connected to the common connection terminal between the switching pin SW of the voltage regulator chip U7 and inductor L3 through capacitor C30. The first ends of capacitors C31, C32, R33, and C29 are all connected to the common connection terminal between inductor L3 and the input pin IN of the conversion chip U6. The second ends of capacitors C31, C32, and C29 are all grounded. The second end of resistor R33 is grounded through resistor R39. The feedback pin VFB of the voltage regulator chip U7 is connected to the common connection terminal between the second end of resistor R33 and resistor R39.

[0149] The enable pin EN of the conversion chip U6 is connected together with the input pin IN of the conversion chip U6, and the ground pin GND of the conversion chip U6 is grounded; the output pin OUT of the conversion chip U6 is electrically connected to both the input terminal of the central processing unit and the input terminal of the power drive circuit; the first end of the capacitor C28 is connected to the common connection terminal between the output pin OUT of the conversion chip U6 and the input terminal of the central processing unit, and the second end of the capacitor C28 is grounded.

[0150] The DC-DC conversion unit described above also utilizes non-isolation technology to efficiently convert a 15V digital voltage signal into a 3.3V digital voltage signal, which is then supplied to the subsequent circuitry (including the central processing unit, current sampling protection unit, and three-phase current acquisition unit). It has a simple structure and low cost.

[0151] In this embodiment, each component in the power supply circuit can be selected according to the appropriate specifications and models, which will not be listed here.

[0152] Preferably, such as Figure 2 As shown, the power drive circuit also includes an overcurrent processing unit;

[0153] The input terminal of the overcurrent processing unit is electrically connected to the output terminal of the three-phase current acquisition unit, and the output terminal of the overcurrent processing unit is electrically connected to the input terminal of the three-phase inverter unit.

[0154] The overcurrent handling unit described above can immediately take protective measures in case of overcurrent, control the three-phase inverter unit to cut off or limit the current, effectively prevent the circuit from being damaged by overcurrent, improve system safety, and extend the system's service life.

[0155] The functions of the above-mentioned overcurrent processing unit are as follows:

[0156] The overcurrent processing unit receives the processed three-phase AC signal collected by the three-phase current acquisition unit, determines whether an overcurrent phenomenon has occurred in the three-phase AC signal, and generates a switch control signal when an overcurrent phenomenon occurs, and outputs the switch control signal to the three-phase inverter unit to control the three-phase inverter unit to cut off or limit the current.

[0157] The overcurrent processing unit in this embodiment can adopt a conventional circuit design, and there are no restrictions here.

[0158] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A sensorless permanent magnet motor control device based on FU6812L2, characterized in that, The device includes a main control circuit, a power drive circuit, and a power supply circuit. The main control circuit includes a central processing unit of model FU6812L2. The output terminal of the power supply circuit is electrically connected to both the input terminal of the central processing unit and the input terminal of the power drive circuit. The output terminal of the central processing unit is electrically connected to the sensorless permanent magnet motor through the power drive circuit. The output terminal of the power drive circuit is also electrically connected to the input terminal of the central processing unit, and the input terminal of the power supply circuit is also electrically connected to the output terminal of the central processing unit.

2. The sensorless permanent magnet motor control device based on FU6812L2 according to claim 1, characterized in that, The power drive circuit includes a three-phase inverter unit, a drive unit, and a three-phase current acquisition unit. The input terminals of the three-phase inverter unit, the drive unit, and the three-phase current acquisition unit are all electrically connected to the output terminal of the power supply circuit. The input terminal of the three-phase inverter unit is also electrically connected to the output terminal of the central processing unit. The output terminal of the three-phase inverter unit is electrically connected to the sensorless permanent magnet motor through the drive unit. The input terminal of the three-phase current acquisition unit is electrically connected to the output terminal of the drive unit, and the output terminal of the three-phase current acquisition unit is electrically connected to the input terminal of the central processing unit.

3. The sensorless permanent magnet motor control device based on FU6812L2 according to claim 2, characterized in that, The three-phase inverter unit includes a three-phase half-bridge driver chip U9, capacitors C44, C46, ​​C48, C50, C54, resistors R57, R58, R59, R60, R63, R64, R65, R66, R67, R71, and R72. The low-side power supply pin VCC of the three-phase half-bridge driver chip U9 is electrically connected to the output terminal of the power supply circuit. The power ground pin VSS and the low-side gate drive pin COM of the three-phase half-bridge driver chip U9 are both grounded. The first end of capacitor C44 is connected to the common connection between the low-side power supply pin VCC of the three-phase half-bridge driver chip U9 and the output terminal of the power supply circuit, and the second end of capacitor C44 is grounded. The first high-side signal input pin HIN1 of the three-phase half-bridge driver chip U9 is electrically connected to the output terminal of the central processing unit through resistor R57, and the second high-side signal input pin HIN2 of the three-phase half-bridge driver chip U9 is electrically connected to the output terminal of the central processing unit through resistor R57. Resistor R58 is electrically connected to the output terminal of the central processing unit. The third high-side signal input pin HIN3 of the three-phase half-bridge driver chip U9 is electrically connected to the output terminal of the central processing unit through resistor R59. The first low-side signal input pin LIN1 of the three-phase half-bridge driver chip U9 is electrically connected to the output terminal of the central processing unit through resistor R60. The second low-side signal input pin LIN2 of the three-phase half-bridge driver chip U9 is electrically connected to the output terminal of the central processing unit through resistor R63. The third low-side signal input pin LIN3 of the three-phase half-bridge driver chip U9 is electrically connected to the output terminal of the central processing unit through resistor R65. The fault indication pin FAULT of the three-phase half-bridge driver chip U9 is electrically connected to the output terminal of the central processing unit through resistor R67. The first end of resistor R64 is connected to the common connection terminal between resistor R67 and the output terminal of the central processing unit, and the second end of resistor R64 is electrically connected to the output terminal of the power supply circuit. The enable pin EN of the three-phase half-bridge driver chip U9 is electrically connected to the output terminal of the central processing unit through resistor R71. The external RC input pin RCIN of the three-phase half-bridge driver chip U9 is electrically connected to the output terminal of the power supply circuit through resistor R72. The first end of capacitor C50 is connected to the common connection terminal between the external RC input pin RCIN of the three-phase half-bridge driver chip U9 and resistor R72, and the second end of capacitor C50 is grounded. The first high-side floating absolute voltage pin VB1 of the three-phase half-bridge driver chip U9 is electrically connected to the input terminal of the driver unit through capacitor C46. The second high-side floating absolute voltage pin VB2 of the three-phase half-bridge driver chip U9 is electrically connected to the input terminal of the driver unit through capacitor C48. The third high-side floating absolute voltage pin VB3 of the three-phase half-bridge driver chip U9 is electrically connected to the input terminal of the driver unit through capacitor C54. The first high-side floating offset voltage pins VS1, VS2, VS3, HO1, HO2, HO3, LO1, LO2, and LO3 of the three-phase half-bridge driver chip U9 are all electrically connected to the input terminal of the driver unit.

4. The sensorless permanent magnet motor control device based on FU6812L2 according to claim 2, characterized in that, The driving unit includes MOSFETs Q5, Q6, Q7, Q8, Q9, and Q10; diodes D15, D16, D17, D18, D22, and D23; capacitors C47, C49, C51, C52, C57, and C58; and resistors R55, R56, R61, R66, R70, R74, R75, R78, R79, R81, R87, R88, R90, R91, and R92. The drains of MOSFETs Q5, Q7, and Q9 are all electrically connected to the output terminal of the power supply circuit. The source of MOSFET Q5 is electrically connected to the drain of MOSFET Q6, the source of MOSFET Q7 is electrically connected to the drain of MOSFET Q8, and the source of MOSFET Q9 is electrically connected to the drain of MOSFET Q10. The source of MOSFET Q6 is grounded through resistor R70, the source of MOSFET Q8 is grounded through resistor R81, and the source of MOSFET Q10 is grounded through resistor R92. The source of MOSFET Q5... The common connection terminals between the drain of MOSFET Q6, Q7 and Q8, and Q9 and Q10 are all electrically connected to the inductive permanent magnet motor; the common connection terminals between the source of MOSFET Q6 and resistor R70, Q8 and R81, and Q10 and R92 are all electrically connected to the input terminal of the three-phase current acquisition unit. The base of MOSFET Q5 is electrically connected to the output terminal of the three-phase inverter unit through resistor R55. The first end of resistor R56, the first end of capacitor C47, and the anode of diode D15 are all connected to the common connection between the base of MOSFET Q5 and resistor R55. The second end of resistor R56 and the second end of capacitor C47 are all connected to the common connection between the source of MOSFET Q5 and the drain of MOSFET Q6. The cathode of diode D15 is electrically connected to the output terminal of the three-phase inverter unit. The base of MOSFET Q6 is electrically connected to the output terminal of the three-phase inverter unit through resistor R61. The first end of resistor R66, the first end of capacitor C49, and the anode of diode D16 are all connected to the common connection between the base of MOSFET Q6 and resistor R61. The second end of resistor R66 and the second end of capacitor C49 are all connected to the common connection between the source of MOSFET Q6 and resistor R70. The cathode of diode D16 is electrically connected to the output terminal of the three-phase inverter unit. The base of MOSFET Q7 is electrically connected to the output terminal of the three-phase inverter unit through resistor R74. The first end of resistor R75, the first end of capacitor C51, and the anode of diode D17 are all connected to the common connection terminal between the base of MOSFET Q7 and resistor R74. The second end of resistor R75 and the second end of capacitor C51 are both connected to the common connection terminal between the source of MOSFET Q7 and the drain of MOSFET Q8. The cathode of diode D17 is electrically connected to the output terminal of the three-phase inverter unit. The base of MOSFET Q8 is electrically connected to the output terminal of the three-phase inverter unit through resistor R78. The first end of resistor R79, the first end of capacitor C52, and the anode of diode D18 are all connected to the common connection terminal between the base of MOSFET Q8 and resistor R78. The second end of resistor R79 and the second end of capacitor C52 are both connected to the common connection terminal between the source of MOSFET Q8 and resistor R81. The cathode of diode D18 is electrically connected to the output terminal of the three-phase inverter unit. The base of MOSFET Q9 is electrically connected to the output terminal of the three-phase inverter unit through resistor R87. The first end of resistor R88, the first end of capacitor C57, and the anode of diode D22 are all connected to the common connection between the base of MOSFET Q9 and resistor R87. The second end of resistor R88 and the second end of capacitor C57 are both connected to the common connection between the source of MOSFET Q9 and the drain of MOSFET Q10. The cathode of diode D22 is electrically connected to the output terminal of the three-phase inverter unit. The base of MOSFET Q10 is electrically connected to the output terminal of the three-phase inverter unit through resistor R90. The first end of resistor R91, the first end of capacitor C58, and the anode of diode D23 are all connected to the common connection between the base of MOSFET Q10 and resistor R90. The second end of resistor R91 and the second end of capacitor C58 are both connected to the common connection between the source of MOSFET Q10 and resistor R92. The cathode of diode D23 is electrically connected to the output terminal of the three-phase inverter unit.

5. The sensorless permanent magnet motor control device based on FU6812L2 according to claim 2, characterized in that, The three-phase current acquisition unit includes three current acquisition sub-circuits; Each of the current acquisition sub-circuits includes an operational amplifier, a first capacitor, a second capacitor, a third capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, and an eleventh resistor; In each current acquisition sub-circuit, the positive power supply pin of the operational amplifier is electrically connected to the output terminal of the power supply circuit, and the negative power supply pin of the operational amplifier is grounded; the positive input pin of the operational amplifier is electrically connected to the output terminal of the driving unit through the sixth resistor and the fifth resistor in sequence, and the inverting input pin of the operational amplifier is grounded through the ninth resistor and the eighth resistor in sequence; the first end of the first capacitor is connected to the common connection terminal between the sixth resistor and the fifth resistor, and the second end of the first capacitor is connected to the common connection terminal between the ninth resistor and the eighth resistor; The positive input pin of the operational amplifier is also electrically connected to the output terminal of the power supply circuit through the third resistor and the first resistor in sequence. The first end of the second resistor and the first end of the fourth resistor are both connected to the common connection terminal between the third resistor and the first resistor. The second end of the second resistor is grounded, and the second end of the fourth resistor is connected to the common connection terminal between the positive input pin of the operational amplifier and the third resistor. The output pin of the op-amp is electrically connected to the input terminal of the central processing unit through the seventh resistor. The first end of the tenth resistor, the first end of the eleventh resistor, and the first end of the third capacitor are all connected to the common connection terminal between the inverting input pin of the op-amp and the ninth resistor. The second end of the tenth resistor, the second end of the eleventh resistor, and the second end of the third capacitor are all connected to the common connection terminal between the output pin of the op-amp and the seventh resistor. The first end of the second capacitor is connected to the common connection terminal between the seventh resistor and the input terminal of the central processing unit, and the second end of the second capacitor is grounded.

6. The sensorless permanent magnet motor control device based on FU6812L2 according to claim 2, characterized in that, The power drive circuit further includes a current sampling protection unit. The input terminal of the current sampling protection unit is electrically connected to the output terminal of the drive unit and the output terminal of the power supply circuit. The output terminal of the current sampling protection unit is electrically connected to the input terminal of the central processing unit.

7. The sensorless permanent magnet motor control device based on FU6812L2 according to claim 6, characterized in that, The current sampling protection unit includes an operational amplifier U4B, diodes D19, D20, and D21, capacitors C53, C55, and C56, and resistors R76, R77, R80, R82, R83, R84, R85, and R86. The positive power supply pin of the operational amplifier U4B is electrically connected to the output terminal of the power supply circuit. The first end of the capacitor C55 is connected to the common connection terminal between the positive power supply pin of the operational amplifier U4B and the output terminal of the power supply circuit, and the second end of the capacitor C55 is grounded. The negative power supply pin of the operational amplifier U4B is grounded. The positive input pin of operational amplifier U4B is grounded through resistor R76; the first ends of resistors R80, R82, and R84 are all electrically connected to the output of the drive unit; the second end of resistor R80 is electrically connected to the positive input pin of operational amplifier U4B through diode D19; the second end of resistor R82 is electrically connected to the positive input pin of operational amplifier U4B through diode D20; and the second end of resistor R84 is electrically connected to the positive input pin of operational amplifier U4B through diode D21. The negative input pin of operational amplifier U4B is grounded through capacitor C56; the first ends of resistors R85 and R86 are both connected to the common connection between the negative input pin of operational amplifier U4B and capacitor C56; the second end of resistor R85 is electrically connected to the output of the power supply circuit; and the second end of resistor R86 is grounded. The output pin of the operational amplifier U4B is electrically connected to the input terminal of the central processing unit through resistor R77. The first end of resistor R83 and the first end of capacitor C53 are both connected to the common connection terminal between the output pin of operational amplifier U4B and resistor R77. The second end of resistor R83 and the second end of capacitor C53 are both grounded.

8. The sensorless permanent magnet motor control device based on FU6812L2 according to claim 1, characterized in that, The power supply circuit includes a safety filter unit, a surge suppression rectifier unit, a power factor correction unit, an analog-to-digital converter unit, and a DC-DC converter unit; The input terminal of the safety filter unit is electrically connected to an external power supply. The output terminal of the safety filter unit is electrically connected to the input terminal of the DC-DC converter unit via the surge suppression rectification unit, the power factor correction unit, the analog-to-digital converter unit, and the DC-DC converter unit in sequence. The output terminals of the power factor correction unit, the analog-to-digital converter unit, and the DC-DC converter unit are all electrically connected to the input terminal of the power drive circuit. The output terminal of the DC-DC converter unit is also electrically connected to the input terminal of the central processing unit. The input terminals of the surge suppression rectification unit and the power factor correction unit are also electrically connected to the output terminal of the central processing unit.

9. The sensorless permanent magnet motor control device based on FU6812L2 according to claim 8, characterized in that, The safety filter unit includes a common-mode inductor FL1, a fuse F1, capacitors CX1, CX2, CY2, CY3, resistors R62, R68, R69, and R73. Pin 2 of common mode inductor FL1 is electrically connected to the positive signal terminal of the external power supply through fuse F1, and pin 1 of common mode inductor FL1 is electrically connected to the negative signal terminal of the external power supply. The first end of resistor R68 and the first end of capacitor CX1 are both connected to the common connection terminal between pin 2 of common mode inductor FL1 and fuse F1. The second end of resistor R68 and the second end of capacitor CX1 are both connected to the common connection terminal between pin 1 of common mode inductor FL1 and the negative signal terminal of the external power supply. Pins 3 and 4 of the common-mode inductor FL1 are electrically connected to the input terminal of the surge suppression rectifier unit. The first terminals of capacitors CX2 and CY2 are connected to the common connection terminal between pin 3 of the common-mode inductor FL1 and the input terminal of the surge suppression rectifier unit. The second terminal of capacitor CY2 is grounded. The second terminal of capacitor CX2 and the first terminal of capacitor CY3 are connected to the common connection terminal between pin 4 of the common-mode inductor FL1 and the input terminal of the surge suppression rectifier unit. The second terminal of capacitor CY3 is grounded. The first terminal of resistor R62 is connected to the common connection terminal between pin 3 of the common-mode inductor FL1 and the input terminal of the surge suppression rectifier unit. The second terminal of resistor R62 is connected to the common connection terminal between pin 4 of the common-mode inductor FL1 and the input terminal of the surge suppression rectifier unit through resistors R69 and R73 in sequence.

10. The sensorless permanent magnet motor control device based on FU6812L2 according to claim 8, characterized in that, The surge suppression rectifier unit includes a relay K1, a bridge rectifier diode D3, a diode D4, a transistor Q2, a resistor R1, a resistor R6, a resistor R9, a resistor R10, and a resistor R58. The first input pin of the bridge rectifier diode D3 is electrically connected to the first output terminal of the safety filter unit through resistor R1, and the second input pin of the bridge rectifier diode D3 is electrically connected to the second output terminal of the safety filter unit; both the first and second output pins of the bridge rectifier diode D3 are electrically connected to the input terminal of the power factor correction unit. The first terminal of the relay K1 coil is electrically connected to the +15V power supply terminal, and the second terminal of the relay K1 coil is electrically connected to the collector of transistor Q2 through resistor R6. The anode of diode D4 and the first terminal of resistor R58 are both connected to the common connection between the second terminal of the relay K1 coil and resistor R6. The cathode of diode D4 is connected to the common connection between the first terminal of the relay K1 coil and the +15V power supply terminal, and the second terminal of resistor R58 is connected to the common connection between resistor R6 and the collector of transistor Q2. The base of transistor Q2 is electrically connected to the output terminal of the central processing unit through resistor R9. The first end of resistor R10 is connected to the common connection terminal between the base of transistor Q2 and resistor R9, and the second end of resistor R10 is grounded. The emitter of transistor Q2 is grounded. The stationary contact of relay K1 is connected to the common connection terminal between the first input pin of bridge rectifier diode D3 and resistor R1. The first moving contact of relay K1 is connected to the common connection terminal between resistor R1 and the first output terminal of the safety filter unit. The second moving contact of relay K1 is floating.

11. The sensorless permanent magnet motor control device based on FU6812L2 according to claim 8, characterized in that, The power factor correction unit includes a power factor correction chip U8, MOSFETs Q1 and Q3, transistor Q4, inductor L1, Schottky diodes D4, D3, D10, and D11, a unidirectional diode D13, capacitors CY1, C22, C23, C24, C25, C26, C27, C36, C37, and C38. Capacitors C39, C40, C41, C42, C43, and C45; resistors R27, R29, R30, R31, R32, R34, R35, R37, R38, R40, R41, R44, R46, R47, R48, R49, R51, R52, R53, and R54; The first terminal of inductor L1 is electrically connected to the first output terminal of the surge suppression rectifier unit. The second terminal of inductor L1 is electrically connected to both the input terminal of the analog-to-digital converter unit and the input terminal of the power drive circuit via Schottky diode D4. The anode of diode D3 and the first terminal of capacitor CY1 are both connected to the common connection between the first terminal of inductor L1 and the first output terminal of the surge suppression rectifier unit. The cathode of diode D3 is connected to the common connection between Schottky diode D4 and the input terminal of the analog-to-digital converter unit. The second terminal of capacitor CY1 is electrically connected to the second output terminal of the surge suppression rectifier unit. Capacitor C... The first terminal of capacitor C22, the first terminal of capacitor C23, the positive terminals of polarized capacitors C24, C25, and C26 are all connected to the common connection terminal between Schottky diode D4 and the input terminal of the analog-to-digital converter unit. The second terminals of capacitors C22, C23, C24, C25, and C26 are all grounded. The negative terminal of diode D11 and the first terminal of resistor R32 are both electrically connected to the second output terminal of the surge suppression rectifier unit. The positive terminal of diode D11 and the second terminal of resistor R32 are both grounded. The source of MOSFET Q1 is connected to the common connection between the second terminal of inductor L1 and Schottky diode D4. The drain of MOSFET Q1 is grounded. The gate of MOSFET Q1 is electrically connected to the gate driver chip GATE of power factor correction chip U8 through resistor R29. The anode of diode D10, the first terminal of resistor R27, and the first terminal of capacitor C27 are all connected to the common connection between the gate of MOSFET and resistor R29. The cathode of diode D10 is connected to the common connection between resistor R29 and the gate driver chip GATE of power factor correction chip U8. The second terminals of resistor R27 and capacitor C27 are both grounded. The inductor current detection pin ISENSE of the power factor correction chip U8 is electrically connected to the second output terminal of the surge suppression rectifier unit through resistor R44. The first terminal of capacitor C38 is connected to the common connection terminal between the inductor current detection pin ISENSE of the power factor correction chip U8 and resistor R44, and the second terminal of capacitor C38 is grounded. The ground pin GND of the power factor correction chip U8 is grounded, the current loop compensation pin ICOMP of the power factor correction chip U8 is grounded through capacitor C36, and the frequency setting pin FREQ of the power factor correction chip U8 is grounded through resistor R46. The power supply pin VCC of the power factor correction chip U8 is grounded through capacitor C43, and the first terminal of capacitor C42 is connected to the power supply pin of the power factor correction chip U8. The common connection between VCC and capacitor C43 is used, and the second terminal of capacitor C42 is grounded. The output voltage detection pin VSENSE of the power factor correction chip U8 is grounded through resistor R49. The first terminal of capacitor C39 and the first terminal of resistor R48 are both connected to the common connection between the output voltage detection pin VSENSE of the power factor correction chip U8 and resistor R49. The second terminal of capacitor C39 and the second terminal of resistor R48 are both grounded. The voltage loop compensation pin VCOMP of the power factor correction chip U8 is grounded through resistor R47 and capacitor C41 in sequence. The first terminal of capacitor C40 is connected to the common connection between the voltage loop compensation pin VCOMP of the power factor correction chip U8 and resistor R47. The second terminal of capacitor C40 is grounded. The gate of MOSFET Q3 is electrically connected to the collector of transistor Q4 through resistor R52. The source of MOSFET Q3 is electrically connected to the +15V power supply terminal. The first end of resistor R51 is connected to the common connection between the source of MOSFET Q3 and the +15V power supply terminal. The second end of resistor R51 is connected to the common connection between the gate of MOSFET Q3 and resistor R52. The drain of MOSFET Q3 is connected to the common connection between the power supply pin VCC of power factor correction chip U8 and capacitor C43. The base of transistor Q4 is electrically connected to the output terminal of the central processing unit through resistor R53. The first end of resistor R54 and the first end of capacitor C45 are both connected to the common connection between the base of transistor Q4 and resistor R53. The second end of resistor R54 and the second end of capacitor C45 are both grounded. The emitter of transistor Q4 is grounded. The first ends of resistors R30 and R31 are both connected to the common connection between Schottky diode D4 and the input terminal of the analog-to-digital converter unit; the second end of resistor R30 is connected in sequence through resistors R34, R37, and R41 to the common connection between the output voltage detection pin VSENSE of the power factor correction chip U8 and resistor R49; the second end of resistor R31 is electrically connected to the input terminal of the power drive circuit in sequence through resistors R35 and R38; the first end of resistor R40 and the first end of capacitor C37 are both connected to the common connection between resistor R38 and the input terminal of the power drive circuit, and the second ends of resistor R40 and capacitor C37 are both grounded; The unidirectional diode D13 includes a first sub-diode and a second sub-diode; wherein, the cathode of the first sub-diode is connected together with the anode of the second sub-diode and connected to the common connection terminal between resistor R38 and the input terminal of the power drive circuit; the anode of the first sub-diode is grounded, and the cathode of the second sub-diode is electrically connected to the +3.3V power supply terminal.

12. The sensorless permanent magnet motor control device based on FU6812L2 according to claim 8, characterized in that, The analog-to-digital conversion unit includes a power management chip U5, an inductor L2, diodes D5, D7, D8, a light-emitting diode D9, capacitors C16, C18, C19, C20, C21, a polarized capacitor C17, and resistors R24, R25, R26, and R28. The drain pin DRAIN of the power management chip U5 is electrically connected to the output terminal of the power factor correction unit. The first end of the capacitor C16 is connected to the common connection terminal between the drain pin DRAIN of the power management chip U5 and the output terminal of the power factor correction unit, and the second end of the capacitor C16 is grounded. The ground pin GND of the power management chip U5 is electrically connected to the input terminal of the DC-DC conversion unit and the input terminal of the power drive circuit through the inductor L2. The unused pin NC of the power management chip U5 is connected to the common connection terminal between the ground pin GND of the power management chip U5 and the inductor L2. The anode of diode D7 is connected to the common connection between inductor L2 and the input terminal of the DC-DC conversion unit. The cathode of diode D7 is connected to the common connection between the ground pin GND of power management chip U5 and inductor L2 via diode D8 and capacitor C18. The first terminals of resistor R24 ​​and capacitor C19 are both connected to the common connection between the ground pin GND of power management chip U5 and inductor L2. The second terminal of resistor R24 ​​is connected to the common connection between the cathode of diode D7 and diode D8 via resistor R28. The second terminal of capacitor C19 is also connected to the common connection between the cathode of diode D7 and diode D8. The power supply pin VCC of power management chip U5 is connected to the common connection between diode D8 and capacitor C18. The error amplifier input pin EA-IN of power management chip U5 is connected to the common connection between the second terminal of resistor R24 ​​and resistor R28. The first terminals of capacitors C20 and C21 are both connected to the common connection between the ground pin GND of power management chip U5 and inductor L2. The second terminal of capacitor C20 is electrically connected to the error amplifier output pin EA-OUT of power management chip U5. The second terminal of capacitor C21 is connected to the common connection between the second terminal of capacitor C20 and the error amplifier output pin EA-OUT of power management chip U5 through resistor R26. The negative terminal of diode D5 is connected to the common connection between the ground pin GND of power management chip U5 and inductor L2, and the positive terminal of diode D5 is grounded. The positive terminal of polarized capacitor C17 and the first terminal of resistor R25 are both connected to the common connection between inductor L2 and the input terminal of the DC-DC conversion unit. The negative terminal of polarized capacitor C17 is grounded, and the second terminal of resistor R25 is grounded through light-emitting diode D9.

13. The sensorless permanent magnet motor control device based on FU6812L2 according to claim 8, characterized in that, The DC-DC conversion unit includes a voltage regulator chip U7, a conversion chip U6, an inductor L3, capacitors C28, C29, C30, C31, C32, C33, C34, C35, a resistor R33, and a resistor R39. The power supply pin VIN of the voltage regulator chip U7 is connected to the enable pin EN, and is electrically connected to the output of the analog-to-digital converter unit. The first ends of capacitors C33, C34, and C35 are all connected to the common connection point between the power supply pin VIN of the voltage regulator chip U7 and the output of the analog-to-digital converter unit. The second ends of capacitors C33, C34, and C35 are all grounded. The ground pin GND of the voltage regulator chip U7 is grounded. The switching pin SW of the voltage regulator chip U7 is electrically connected to the input pin IN of the conversion chip U6 through inductor L3. The pilot pin VBST of the voltage regulator chip U7 is connected to the common connection terminal between the switching pin SW of the voltage regulator chip U7 and inductor L3 through capacitor C30. The first ends of capacitors C31, C32, R33, and C29 are all connected to the common connection terminal between inductor L3 and the input pin IN of the conversion chip U6. The second ends of capacitors C31, C32, and C29 are all grounded. The second end of resistor R33 is grounded through resistor R39. The feedback pin VFB of the voltage regulator chip U7 is connected to the common connection terminal between the second end of resistor R33 and resistor R39. The enable pin EN of the conversion chip U6 is connected together with the input pin IN of the conversion chip U6, and the ground pin GND of the conversion chip U6 is grounded; the output pin OUT of the conversion chip U6 is electrically connected to both the input terminal of the central processing unit and the input terminal of the power drive circuit; the first end of the capacitor C28 is connected to the common connection terminal between the output pin OUT of the conversion chip U6 and the input terminal of the central processing unit, and the second end of the capacitor C28 is grounded.

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