High-efficiency non-inductive brushless motor drive circuit structure

Abstract

The utility model relates to the technical field of brushless motor drive circuits, in particular to a high-efficiency non-inductive brushless motor drive circuit structure, which comprises an STM32G030K6T6 micro-control unit and a position signal detection circuit, wherein the position signal detection circuit is used for acquiring position information of a BLDC (brushless direct current) motor and feeding back the position information to the STM32G030K6T6 micro-control unit; a first control end of the STM32G030K6T6 micro-control unit is connected with an inverter circuit through a power driving circuit, and a second control end of the STM32G030K6T6 micro-control unit realizes soft switching of the inverter circuit through a resonance circuit; a hardware protection circuit is arranged between the inverter circuit and the STM32G030K6T6 micro-control unit, and the inverter circuit is connected with the BLDC motor. In practical application, a Hall sensor is replaced by a high-frequency square wave injection method, accurate rotor position detection of the non-inductive BLDC motor is realized, system hardware cost and complexity are reduced, and system robustness is improved. The dependence on an external sensor is reduced by using the resonance circuit, the hardware complexity is reduced, and meanwhile, the switching loss is effectively reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a brushless motor drive circuit technical field, concretely relates to a kind of efficient non-inductive brushless motor drive circuit structure. BACKGROUND

[0002] Brushless DC motor (BLDC) is widely used in industrial control, household appliances, electric vehicles and other fields due to its high efficiency, reliability and superior speed regulation performance. BLDC motor usually adopts three-phase H-bridge topology structure, and generates PWM signal through microcontroller (MCU) to control MOSFET switch, so as to drive motor to run. The traditional driving method relies on Hall sensor feedback rotor position to realize accurate commutation, but this hard switching mode has significant switching loss, which limits the system efficiency and stability.

[0003] Application No. CN202411080192.1 discloses an energy-saving brushless motor drive circuit, which introduces LC resonant circuit in three-phase H-bridge to realize zero-voltage turn-on and turn-off (ZVS) of MOSFET, effectively reduces switching loss and EMI, and improves system efficiency. However, this scheme relies on accurate matching of resonant circuit parameters, has insufficient dynamic load adaptability, and is mainly suitable for inductive BLDC motor with Hall sensor, which cannot meet the needs of non-inductive motor. In addition, the introduction of resonant circuit increases hardware complexity and system cost, and has poor robustness and stability in fast load change or strong interference scene, which limits its promotion in more extensive application scenarios, especially in the background of rapid growth of non-inductive BLDC motor driving demand, technical breakthrough is urgently needed to optimize soft switching performance, improve non-inductive driving precision and dynamic stability of system. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a kind of efficient non-inductive brushless motor drive circuit structure.

[0005] The utility model provides the following technical scheme:

[0006] The utility model provides a kind of efficient non-inductive brushless motor drive circuit structure, including STM32G030K6T6 microcontrol unit and the position signal detection circuit for gathering BLDC motor position information and feedback to the STM32G030K6T6 microcontrol unit, the first control end of the STM32G030K6T6 microcontrol unit is connected with an inverter circuit through power drive circuit, and the second control end of the STM32G030K6T6 microcontrol unit realizes the soft switch of the inverter circuit through resonant circuit;Hardware protection circuit is arranged between the inverter circuit and the STM32G030K6T6 microcontrol unit, and the inverter circuit is connected with the BLDC motor.

[0007] Further, the hardware protection circuit is collected by a direct current side sampling circuit, a filtering circuit, a comparison circuit, a STM32G030K6T6 micro control unit and a feedback.

[0008] Further, the power drive circuit is composed of three IR2110 drive ICs in cascade.

[0009] Further, the inverter circuit adopts a three-phase H-bridge structure, and the winding current direction of the BLDC motor is controlled through six MOSFET devices, so that a rotating magnetic field is generated to drive the motor to rotate, and the model of the MOSFET device is NCE65TF099.

[0010] Further, the position signal detection circuit is composed of an OPA365 operational amplifier and a TL331 comparator circuit.

[0011] Further, the resonance circuit comprises a resonance inductor and a resonance capacitor.

[0012] Compared with the prior art, the utility model in the actual application is efficient and stable, uses high frequency square wave injection method to replace the hall sensor, realizes the accurate rotor position detection of the non-inductive BLDC motor, reduces the system hardware cost and complexity, improves the system robustness and application scene adaptability, reduces the dependence on external sensors by using the resonance circuit, reduces the hardware complexity, effectively reduces the switching loss, and is suitable for industrial popularization. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is the circuit principle diagram of the utility model.

[0014] Figure 2 It is the circuit principle diagram of the STM32G030K6T6 micro control unit and communication circuit.

[0015] Figure 3 It is the circuit principle diagram of the auxiliary power supply circuit.

[0016] Figure 4 It is the circuit principle diagram of the power drive circuit.

[0017] Figure 5 It is the circuit principle diagram of the inverter circuit.

[0018] Figure 6 It is the circuit principle diagram of the resonance circuit.

[0019] Figure 7 It is the circuit principle diagram of the position signal detection circuit.

[0020] Figure 8 It is the circuit principle diagram of the hardware protection circuit. DETAILED DESCRIPTION

[0021] The utility model will be further described below with reference to the drawings.

[0022] Referring to Figure 1 In an embodiment of the utility model, an efficient non-inductive brushless motor drive circuit structure, including STM32G030K6T6 micro control unit and the position signal detection circuit for gathering BLDC motor position information and feedback to STM32G030K6T6 micro control unit, the first control end of STM32G030K6T6 micro control unit is connected with an inverter circuit through power drive circuit, and the soft switch of the inverter circuit is realized through resonance circuit at the second control end of STM32G030K6T6 micro control unit;Hardware protection circuit is arranged between the inverter circuit and the STM32G030K6T6 micro control unit, and the inverter circuit is connected with the BLDC motor.

[0023] Referring to Figure 1 And Figure 2 In the above embodiment, the communication circuit is provided to collect and feedback the information of the STM32G030K6T6 micro control unit.

[0024] Referring to Figure 1 And Figure 3 In the above embodiment, the auxiliary power supply circuit for providing stable voltage and ensuring stable operation of the circuit is further provided, and the auxiliary power supply circuit is composed of a flyback circuit and an LDO circuit, the flyback circuit is controlled by a VIPER22A high-performance PWM switching power supply controller to provide stable output voltage;VIPER22A is built-in 800V power MOSFET, to ensure stable work in the wide input voltage range of 85V to 265V;The LDO circuit is used as a low-voltage output stabilizer in the auxiliary power supply, and is provided by L78M05ABDT-TR semiconductor main control, provides constant 5V output in a wider input voltage range, guarantees lower noise and stable output, and ensures high power quality;The LDO circuit cooperates with the high-efficiency conversion function of the flyback circuit, to further improve the stability and reliability of the system.

[0025] In the above embodiment, the control of output voltage ripple is designed at the power supply, to ensure stable output and low electromagnetic interference (EMI).

[0026] Referring to Figure 1 In an embodiment of the utility model, the hardware protection circuit is a direct-current side sampling circuit, which collects the direct-current signal of the inverter circuit through a filtering circuit, and feeds back to the STM32G030K6T6 micro control unit through a comparison circuit.

[0027] Referring to Figure 4In an embodiment of the utility model, the power drive circuit is by three piece IR2110 drive IC cascade constitute, simplify circuit design reduce peripheral element, adapt to extensive working voltage range, apply to high power drive application, can satisfy the demand of motor high speed operation, solve the drive problem of high bit and low bit MOSFET simultaneously.

[0028] Referring to Figure 1 And Figure 5 In an embodiment of the utility model, the inverter circuit adopts three-phase H bridge structure, and the winding current direction of the BLDC motor is controlled through 6 MOSFET devices to generate a rotating magnetic field to drive the motor to rotate, and the model of the MOSFET device is NCE65TF099; it can be applied to high-voltage and high-efficiency brushless DC motor driving, and the low gate charge characteristic reduces power consumption and improves system efficiency and stability.

[0029] In the above embodiment, each phase is composed of two switching elements, and the upper and lower tubes are alternately turned on to control the current flow direction; a six-step commutation control mode is adopted to activate different switching combinations in turn to ensure the current flowing in the motor winding, thereby realizing the rotation of the motor.

[0030] Referring to Figure 6 In an embodiment of the utility model, the resonant circuit adopts a UCC27517 drive chip, which can minimize the through current through an efficient circuit architecture, support fast processing of high peak current pulses, and provide reliable driving performance for capacitive loads; the resonant circuit is also provided with a resonant inductor and a resonant capacitor to realize zero voltage switching (ZVS) of the power MOSFET, so as to effectively reduce switching loss and electromagnetic interference (EMI), and at the same time reduce power loss and device thermal stress caused by direct switching of high voltage or high current in the hard switching process.

[0031] Referring to Figure 7 In an embodiment of the utility model, the position signal detection circuit is composed of an operational amplifier (OPA365) and a TL331 comparator circuit; the signal is amplified through the same direction amplification circuit composed of the operational amplifier (OPA365), to ensure that the signal is strong enough for further processing; then, the signal passes through the TL331 comparator circuit for zero-crossing detection, so as to accurately capture the zero-crossing point in the signal, thereby realizing accurate rotor position detection; finally, the processed signal is provided to the control algorithm of the system to adjust the commutation logic of the motor, to ensure that the BLDC motor can be efficiently and accurately driven without sensors.

[0032] Referring to Figure 1 , Figure 2 And Figure 7The utility model discloses (utilize high frequency square wave injection method) through inverter circuit generates high frequency square signal and injects into the stator winding of motor, then, feedback signal is sampled through analog-digital converter (ADC), records the change characteristic of current or voltage, in order to extract the effective rotor position information from feedback signal, adopts digital signal processing (DSP) technology to filter and demodulate feedback signal to eliminate noise interference, and accurately extracts the inductance information related with rotor position from signal, finally, the position of rotor is calculated through control algorithm.

[0033] Reference Figure 8 In an embodiment of the utility model, hardware protection circuit mainly is constituted by comparator and direct current sampling circuit, when direct current sampling feedback value exceeds the reference value of comparator, comparator outputs high level to the SD pin of drive IC, and SD pin stops driving under the condition of high level.

[0034] The embodiments of the utility model are given for example and description, although the above has shown and described the embodiment of the utility model, can understand that the above-mentioned embodiment is exemplary, cannot be understood as the limitation of the utility model, and the ordinary skill of the art person can change, modify, replace and change in the range of the utility model to the above-mentioned embodiment.

Claims

1. A high efficiency non-inductive brushless motor drive circuit structure, characterized by: The application relates to a BLDC motor control system, which comprises an STM32G030K6T6 micro control unit and a position signal detection circuit for collecting BLDC motor position information and feeding back to the STM32G030K6T6 micro control unit, a first control end of the STM32G030K6T6 micro control unit is connected with an inverter circuit through a power drive circuit, and the second control end of the STM32G030K6T6 micro control unit realizes the soft switching of the inverter circuit through a resonance circuit; a hardware protection circuit is arranged between the inverter circuit and the STM32G030K6T6 micro control unit, and the inverter circuit is connected with the BLDC motor.

2. The efficient non-inductive brushless motor drive circuit structure according to claim 1, characterized in that: The hardware protection circuit is a DC signal of the inverter circuit collected by a DC side sampling circuit through a filtering circuit, fed back to the STM32G030K6T6 micro control unit through a comparison circuit.

3. The efficient non-inductive brushless motor drive circuit structure of claim 1, wherein: The power drive circuit is composed of three IR2110 drive ICs in cascade.

4. The efficient non-inductive brushless motor drive circuit structure of claim 1, wherein: The inverter circuit adopts a three-phase H-bridge structure, the winding current direction of the BLDC motor is controlled through six MOSFET devices, a rotating magnetic field is generated to drive the motor to rotate, and the model of the MOSFET device is NCE65TF099.

5. The efficient non-inductive brushless motor drive circuit structure of claim 1, wherein: The position signal detection circuit is composed of an OPA365 operational amplifier and a TL331 comparator circuit.

6. The efficient non-inductive brushless motor drive circuit structure of claim 1, wherein: The resonance circuit comprises a resonance inductor and a resonance capacitor.

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