Brushless motor driver circuit system based on airborne environment

Abstract

The utility model discloses a brushless motor driver circuit system based on an airborne environment. The brushless motor driver circuit system comprises a main control circuit, a driving circuit, a power circuit, an analog signal acquisition circuit and a multi-source control circuit, one end of the analog signal acquisition circuit is connected with the power circuit, and the other end of the analog signal acquisition circuit is connected with the master control circuit; the output end of the main control circuit is connected with the driving circuit; the output end of the driving circuit is connected with the power circuit; the power circuit is connected with the brushless motor; the multi-source control circuit is used for supplying power, one end of the multi-source control circuit is connected with the main control circuit, and the multi-source control circuit sends a power control signal to the main control circuit to enable the main control circuit to select a power mode so as to control forward rotation, reverse rotation and emergency response of the brushless motor. According to the scheme, corresponding motor functions can be realized by supplying corresponding 28V voltage to the forward power signal end, the reverse power signal end and the emergency power signal end.

Description

Technical Field

[0001] This application relates to the field of motor technology, and in particular to a brushless motor driver circuit system based on an airborne environment. Background Technology

[0002] In recent years, with the development of industrial automation and intelligence, the requirements for motor drive technology have become increasingly stringent.

[0003] The harsh environment of airborne systems presents complex power supply characteristics: wide voltage fluctuation range (e.g., ±20%), transient voltage spikes (e.g., lightning strikes or load changes), and high-frequency noise interference; stringent reliability requirements: aviation equipment must withstand extreme temperatures (-55℃ to +125℃), vibration, shock, and other harsh environments, and requires long lifespan and low failure rate; lightweight and high power density: aviation equipment is sensitive to size and weight, and must achieve efficient energy conversion within a limited space; electromagnetic compatibility (EMC): it is necessary to avoid electromagnetic interference to sensitive airborne communication, navigation, and other equipment.

[0004] With the continuous advancement and development of motor technology, brushless DC motors (BLDC) and permanent magnet synchronous motors (PMSM) have become more efficient, have higher power density, are maintenance-free (no brush wear), and have lower noise compared to traditional brushed motors. They are widely used in the aerospace field (e.g., fuel pumps, environmental control systems, actuators). From early square wave drives to advanced algorithms such as vector control (FOC) and direct torque control (DTC), dynamic response and energy efficiency have been improved. The application of wide-bandgap semiconductor devices such as silicon carbide (SiC) and gallium nitride (GaN) has reduced switching losses and improved the efficiency and power density of drivers. Utility Model Content

[0005] Embodiments of this application provide a brushless motor driver circuit system based on an airborne environment.

[0006] To achieve the above objectives, embodiments of this application provide a brushless motor driver circuit system based on an airborne environment, including: a main control circuit, a drive circuit, a power circuit, an analog signal acquisition circuit, and a multi-source control circuit;

[0007] One end of the analog signal acquisition circuit is connected to the power circuit, and the other end of the analog signal acquisition circuit is connected to the main control circuit. The analog signal acquisition circuit is used to acquire the feedback signals of the output current and output voltage of the power circuit and transmit them to the main control circuit.

[0008] The output terminal of the main control circuit is connected to the drive circuit, and the main control circuit outputs a control signal to the drive circuit according to the feedback signal.

[0009] The output terminal of the drive circuit is connected to the power circuit, and the drive circuit adjusts the output current and output voltage of the power circuit according to the control signal.

[0010] The power circuit is connected to the brushless motor, and the power circuit outputs three-phase current and three-phase voltage adjusted according to the drive circuit.

[0011] The multi-source control circuit supplies power to the main control circuit, the drive circuit, the power circuit, and the analog signal acquisition circuit. One end of the multi-source control circuit is connected to the main control circuit. The multi-source control circuit sends a power control signal to the main control circuit to enable the main control circuit to select the power mode in order to control the forward rotation, reverse rotation, and emergency response of the brushless motor.

[0012] In one embodiment, the multi-source control circuit includes: a power selection mode sub-circuit, a power supply circuit, and a power signal feedback sub-circuit;

[0013] The input terminal of the power selection mode sub-circuit is connected to the input terminal of the power signal feedback sub-circuit, and is used to feed back the corresponding power signal when there is a power signal input.

[0014] The output terminal of the power selection mode sub-circuit is connected to the power supply circuit to provide power voltage to the power supply circuit;

[0015] The output terminals of the power supply circuit provide 15V, 5V, and 3.3V voltages, and the power supply circuit is connected to the power circuit, the drive circuit, the main control circuit, and the analog signal acquisition circuit.

[0016] The output of the power signal feedback sub-circuit is connected to the main control circuit, and is used to step down and filter the high-voltage power signal and feed it back to the main control circuit for corresponding mode selection.

[0017] In one embodiment, the power selection mode sub-circuit includes: forward buck diode D3, reverse buck diode D6, emergency buck diode D8, constant power supply first buck diode D11, and constant power supply second buck diode D13;

[0018] The positive terminal of the forward buck diode D3 is connected to the FORWADR power supply signal, the positive terminal of the reverse buck diode D6 is connected to the REVERSE power supply signal, the positive terminal of the emergency buck diode D8 is connected to the EMERGENCY power supply signal for voltage reduction, the positive terminal of the normally powered first buck diode D11 is connected to the normally powered 28V power signal, and the negative terminal of the normally powered first buck diode D11 is connected to the positive terminal of the second buck diode D13; the negative terminals of the forward buck diode D3, the reverse buck diode D6, the emergency buck diode D8, and the second buck diode D13 are connected together and connected to the input terminal of the power supply circuit.

[0019] In one embodiment, the power signal feedback sub-circuit includes:

[0020] One end of the first voltage divider resistor R11 is connected to the power selection mode sub-circuit, and the other end of the first voltage divider resistor R11 is connected to a π-type filter composed of a first filter capacitor C14, a second filter capacitor C15, and a filter inductor L3; the rear end of the π-type filter is connected to ground via a second voltage divider resistor R7; an RC filter circuit composed of a filter resistor R6 and a third filter capacitor C13 is connected in parallel across the second voltage divider resistor R7, and the rear end of the RC filter circuit is connected to a protection diode D2 and to the main control circuit.

[0021] In one embodiment, it further includes: a position information feedback circuit, which is connected to the main control circuit, the power supply circuit and the motor Hall sensor; the motor Hall sensor is mounted on the brushless motor;

[0022] The position information feedback circuit is used to provide feedback on the position of the brushless motor during its operation.

[0023] In one embodiment, the position information feedback circuit includes: an inverter IC2, wherein pin 1Y is connected to pin 6A, pin 2Y is connected to pin 5A, and pin 3Y is connected to pin 4A; pins 1A, 2A, and 3A are connected to the motor Hall sensor, and pins 4Y, 5Y, and 6Y are connected to the main control circuit.

[0024] In one embodiment, it further includes: a communication circuit, the communication circuit being connected to the main control circuit and the host computer; the communication circuit is also connected to the power supply circuit.

[0025] In one embodiment, the communication circuit includes: a CAN communication chip; the CANH and CANL pins of the CAN communication chip are both connected to the host computer, and a terminating resistor R118 is connected in parallel between the CAN communication chip and the host computer; a current-limiting resistor R110 is connected between the VCC pin of the CAN communication chip and the power supply pin of the power supply circuit that outputs 5V DC voltage, and the TX and RX pins of the CAN communication chip are both connected to the main control circuit.

[0026] Compared with existing technologies, this application offers the following advantages: The brushless motor driver circuit system provided by this solution, based on an airborne environment, enables the corresponding motor functions by supplying 28V voltage to the forward, reverse, and emergency power signal terminals. Feedback signals from the power circuit are acquired through an analog signal acquisition circuit, which then feeds these signals back to the main control circuit. The main control circuit adjusts the control signals of the drive circuit based on the feedback signals, and the drive circuit adjusts the output current and output voltage of the power circuit according to the control signals, thereby achieving both high accuracy in current control and efficient voltage utilization. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a structural block diagram of a brushless motor driver circuit system based on an airborne environment, according to an embodiment of this application.

[0029] Figure 2 This is a schematic diagram of the power selection mode sub-circuit in the brushless motor driver circuit system based on an airborne environment, according to an embodiment of this application.

[0030] Figure 3 This is a schematic diagram of the power signal feedback sub-circuit in the brushless motor driver circuit system based on an airborne environment, according to an embodiment of this application.

[0031] Figure 4 This is a schematic diagram of the electronic circuit in a brushless motor driver circuit system based on an airborne environment, according to an embodiment of this application.

[0032] Figure 5 This is a schematic diagram of the drive circuit in the brushless motor driver circuit system based on an airborne environment, according to an embodiment of this application.

[0033] Figure 6This is a schematic diagram of the power circuit in a brushless motor driver circuit system based on an airborne environment, according to an embodiment of this application.

[0034] Figure 7 This is a schematic diagram of the analog signal acquisition circuit in the brushless motor driver circuit system based on an airborne environment, according to an embodiment of this application.

[0035] Figure 8 for Figure 7 Equivalent diagram;

[0036] Figure 9 This is a schematic diagram of the position information feedback circuit in the brushless motor driver circuit system based on an airborne environment, according to an embodiment of this application.

[0037] Figure 10 This is a schematic diagram of the communication circuit in a brushless motor driver circuit system based on an airborne environment, according to an embodiment of this application. Detailed Implementation

[0038] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0039] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0040] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation", "connection" and "joining" should be interpreted broadly, for example, they can refer to fixed connection, detachable connection, or integral connection; for those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0041] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0042] Reference Figure 1 The embodiments of this application provide a brushless motor driver circuit system based on an airborne environment, including: a main control circuit 4, a drive circuit 5, a power circuit 6, an analog signal acquisition circuit 9, and a multi-source control circuit;

[0043] One end of the analog signal acquisition circuit 9 is connected to the power circuit 6, and the other end of the analog signal acquisition circuit 9 is connected to the main control circuit 4. The analog signal acquisition circuit 9 is used to acquire the feedback signals of the output current and output voltage of the power circuit 6 and transmit them to the main control circuit 4.

[0044] The output terminal of the main control circuit 4 is connected to the drive circuit 5, and the main control circuit 4 outputs a control signal to the drive circuit 5 according to the feedback signal;

[0045] The output terminal of the drive circuit 5 is connected to the power circuit 6, and the drive circuit 5 adjusts the output current and output voltage of the power circuit 6 according to the control signal.

[0046] The power circuit 6 is connected to the brushless motor, and the power circuit 6 outputs three-phase current and three-phase voltage adjusted according to the drive circuit 5.

[0047] The multi-source control circuit supplies power to the main control circuit 4, the drive circuit 5, the power circuit 6, and the analog signal acquisition circuit 9. One end of the multi-source control circuit is connected to the main control circuit 4. The multi-source control circuit sends a power control signal to the main control circuit 4 to enable the main control circuit 4 to select a power mode.

[0048] Specifically, the feedback signals acquired by the analog signal acquisition circuit 9 from the power circuit 6 include three current feedback signals and one voltage feedback signal. The three current feedback signals are used to feed back the output current of the power circuit 6, and the one voltage feedback signal is used to feed back the output voltage of the power circuit 6.

[0049] In one embodiment, the multi-source control circuit includes a power selection mode sub-circuit 1, a power supply circuit 2, and a power signal feedback sub-circuit 3;

[0050] The input terminal of the power selection mode sub-circuit 1 is connected to the input terminal of the power signal feedback sub-circuit 3, and is used to feed back the corresponding power signal when there is an input power signal.

[0051] The output terminal of the power selection mode sub-circuit 1 is connected to the power supply circuit 2 and is used to provide power voltage to the power supply circuit 2.

[0052] The output terminals of the power supply circuit 2 provide 15V, 5V, and 3.3V voltages;

[0053] The output of the power signal feedback sub-circuit 3 is connected to the main control circuit 4, and is used to step down and filter the high-voltage power signal and feed it back to the main control circuit 4 for corresponding mode selection.

[0054] In one embodiment, such as Figure 2 As shown, the power selection mode sub-circuit 1 includes: forward buck diode D3, reverse buck diode D6, emergency buck diode D8, constant power supply first buck diode D11 and constant power supply second buck diode D13;

[0055] The anode of the forward buck diode D3 is connected to the FORWADR power supply signal, the anode of the reverse buck diode D6 is connected to the REVERSE power supply signal, the anode of the emergency buck diode D8 is connected to the EMERGENCY power supply signal for voltage reduction, the anode of the normally powered first buck diode D11 is connected to the normally powered 28V power signal, and the cathode of the normally powered first buck diode D11 is connected to the anode of the second buck diode D13. The cathodes of the forward buck diode D3, the reverse buck diode D6, the emergency buck diode D8, and the second buck diode D13 are connected and connected to the input terminal of the power supply circuit. The FORWADR, REVERSE, and EMERGENCY power supply signals are three externally supplied power sources provided through an external power interface.

[0056] In one embodiment, such as Figure 3 As shown, the power signal feedback sub-circuit 3 includes:

[0057] One end of the first voltage divider resistor R11 is connected to the power selection mode sub-circuit 1, and the other end of the first voltage divider resistor R1 is connected to a π-type filter composed of a first filter capacitor C14, a second filter capacitor C15 and a filter inductor L3; the rear end of the π-type filter is connected to ground by a second voltage divider resistor R7; an RC filter circuit composed of a filter resistor R6 and a third filter capacitor C13 is connected in parallel across the second voltage divider resistor R7, and the rear end of the RC filter circuit is connected to the protection diode D2 and the main control circuit 4.

[0058] In one embodiment, such as Figure 4As shown, the power supply circuit 2 includes: a power management chip U1, a first input capacitor C1, a second input capacitor C2, a first voltage divider resistor R1, a second voltage divider resistor R2, a first output capacitor C3, a first bootstrap capacitor C4, and a filter inductor L1. The IN pin of the power management chip U1 is connected to a 28V DC voltage, the EN pin is connected to a 28V DC voltage via a first resistor R8, and the RON pin is connected to a 28V DC voltage via a second resistor R9. The IN, EN, and RON pins of the power management chip U1 are all connected to a 28V DC voltage. The IN pin is also connected to the first input capacitor C1 and the second input capacitor C2. The first input capacitor C1 and the second input capacitor C2 are connected to the PGND pin. The first input capacitor C1 is used to filter out the pulsating current at the input terminal, providing a stable voltage to the input terminal of the power management chip U1. The size of the first input capacitor determines the voltage ripple at the input terminal of the power management chip U1. A first bootstrap capacitor C4 is connected between the BS and LX pins of power management chip U1. An external filter inductor L1 is connected to the LX pin of power management chip U1. A first voltage divider resistor R1 is connected between the FB pin of power management chip U1 and the output terminal of filter inductor L1. A second voltage divider resistor R2 is connected between the FB pin and PGND pin of power management chip U1. A second output capacitor C6 is connected between the FB pin of power management chip U1 and the output terminal of filter inductor L1. The first and second voltage divider resistors R1 and R2 are used to adjust the output voltage by selecting appropriate resistance values. To reduce the losses of the voltage divider resistors, the resistance values ​​of the first and second voltage divider resistors R1 and R2 are usually between 10kΩ. Up to 1M The filter inductor L1 is used to filter out the current ripple at the output terminal. The first output capacitor C3 is used to withstand the pulsation of the inductor current, reduce the output voltage ripple, and simultaneously ensure both steady-state and dynamic characteristics; the first bootstrap capacitor C4 is used for internal bootstrap power supply. The power management chip U1 can be an XC8821 chip.

[0059] The power management chip U1 operates in PWM fixed-frequency mode, meeting the application requirements for low-frequency ripple-free operation. The XC8821 chip also features peak current protection, short-circuit protection, and thermal protection, ensuring reliable operation. The IN pin of the power management chip U1 is the input power supply pin. A first input capacitor C1 and a second input capacitor C2 are added between the IN pin and the PGND pin to form a protective capacitor. The EN pin of the power management chip U1 is the external enable control pin. When high, the power management chip U1 is operational. The EN pin cannot be left floating, so a first resistor R8 is added to the EN pin for current limiting protection. The RON pin of the power management chip U1, through a second resistor R9 connected to the IN pin, sets the on-time of the internal switching transistor. The VCC pin of the power management chip U1 is the internal input power supply. The first output capacitor C3 added to the VCC pin and the PGND pin together filter out the pulsating current at the input, providing a stable voltage to the input of the power management chip U1. The size of the input capacitance determines the voltage ripple at the input of the power management chip U1. The FB pin of the power management chip U1 is the feedback pin, and the output voltage is changed by adjusting the resistance values ​​of the first voltage divider resistor R1 and the second voltage divider resistor R2. The BS pin of the power management chip U1 is the bootstrap capacitor pin, which requires the first bootstrap capacitor C4 for internal bootstrap power supply. The LX pin of the power management chip U1 is the switching node pin, and an external filter inductor L1 is connected to stabilize the current ripple and determine the inductance value. The function of the second output capacitor C6 is to provide inductor current ripple, reduce output voltage ripple, and simultaneously consider both steady-state and dynamic characteristics.

[0060] The power supply pin for the 28V DC input of the electronic circuit 2 is connected to the power chip power supply pin of the power circuit 6. The power supply pin for the 15V DC output of the electronic circuit 2 is connected to the power chip power supply pin of the drive circuit 5. The power supply pin for the 3.3V DC output of the electronic circuit 2 is connected to the power supply pins of the functional chips of the main control circuit 4, the communication circuit, the position information feedback circuit 8, and the analog signal acquisition circuit 9, respectively.

[0061] In one embodiment, such as Figure 5 As shown, the driving circuit 5 includes: a driving chip U2, a bootstrap diode V1, a second bootstrap capacitor C5, a first gate resistor R3, and a second gate resistor R4.

[0062] The VCC pin of driver chip U2 is connected to power supply circuit 2; the HIN pin of driver chip U2 is connected to the PWM3A pin of the main control chip in main control circuit 4; the LIN pin of driver chip U2 is connected to the PWM3B pin of the main control chip in main control circuit 4; the VB pin of driver chip U2 is connected to the negative terminal of bootstrap diode V1, and the positive terminal of bootstrap diode V1 is connected to the power supply through the seventh resistor R14; the VS pin of driver chip U2 is connected to the second bootstrap capacitor C5, and the other end of the second bootstrap capacitor C5 is connected to the negative terminal of bootstrap diode V1; the HO pin of driver chip U2 is connected to the first gate resistor R3; the LO pin of driver chip U2 is connected to the second gate resistor R4; and the HO and LO pins of driver chip U2 are connected to the gate G of the MOSFET in power circuit 6 through the first gate resistor R3 and the second gate resistor R4, respectively. The function of driver circuit 5 is to provide half-bridge drive, undervoltage protection, and high voltage withstand capability. The bootstrap diode V1 is used for fast recovery time, strong voltage withstand capability, and large steady-state current; the second bootstrap capacitor C5 is used for internal bootstrap power supply to provide drive voltage for power circuit 6; the first gate resistor R3 and the second gate resistor R4 are used for low power consumption and fast drive speed.

[0063] Among them, the driver chip U2 can be selected as IR2181. IR2181 is a high-voltage, high-speed power MOSFET and IGBT driver with independent high-measure and low-measure reference output channels.

[0064] In one embodiment, such as Figure 6 As shown, power circuit 6 includes a first MOSFET Q1, a second MOSFET Q2, a third MOSFET Q3, a fourth MOSFET Q4, a fifth MOSFET Q5, a sixth MOSFET Q6, a first sampling resistor R5, a second sampling resistor R6, and a third sampling resistor R7. Power circuit 6 adopts a three-phase bridge circuit connection.

[0065] The power supply circuit provides a 28V DC voltage, which is input to the drains (D) of the first MOSFET Q1, the third MOSFET Q3, and the fifth MOSFET Q5 in the power circuit 6, as well as the third input capacitor C7, the fourth input capacitor C8, and the fifth input capacitor C9. The source (S) of the first MOSFET Q1 is connected to the drain (D) of the fourth MOSFET Q4, the source (S) of the third MOSFET Q3 is connected to the drain (D) of the sixth MOSFET Q6, and the source (S) of the fifth MOSFET Q5 is connected to the drain (D) of the second MOSFET Q2. The first MOSFET Q1... The gates G of the second MOSFET Q2, the third MOSFET Q3, the fourth MOSFET Q4, the fifth MOSFET Q5, and the sixth MOSFET Q6 are connected to the HO and LO pins of the driving chip of the driving circuit 5. The source S of the fourth MOSFET Q4 is connected to the first sampling resistor R5, the source S of the sixth MOSFET Q6 is connected to the second sampling resistor R6, and the source S of the second MOSFET Q2 is connected to the third sampling resistor R7. The first sampling resistor R5, the second sampling resistor R6, and the third sampling resistor R7 are all connected to the analog signal acquisition circuit 9.

[0066] Power circuit 6 achieves precise voltage control by controlling the rectifier's conduction angle. Simultaneously, current control is achieved by adjusting the load resistance, rectifier conduction angle, and trigger pulse width. The rectifier conducts current during either the positive or negative half-cycle, reducing energy consumption and losses, improving efficiency, minimizing interference with the power supply, and producing a smoother output waveform with lower harmonic levels. This enables functions such as rapid reversal and multi-segment speed control for brushless DC motors.

[0067] In one embodiment, two analog signal acquisition circuits 9 are provided, such as... Figure 7 As shown, each analog signal acquisition circuit 9 includes a filter sub-circuit, a bias sub-circuit, and an operational amplifier. The filter sub-circuit is connected to the bias sub-circuit, the bias sub-circuit is connected to the operational amplifier, and the operational amplifier is connected to the main control circuit 4. The filter sub-circuit receives the sampling signals output from the first sampling resistor R5, the second sampling resistor R6, and the third sampling resistor R7. The filter sub-circuit filters the sampling signals and sends them to the bias sub-circuit. The bias sub-circuit sends the filtered sampling signals to the operational amplifier, and the operational amplifier feeds the sampling signals back to the main control circuit 4.

[0068] The filter sub-circuit consists of a third resistor R10, a fourth resistor R11, a fifth capacitor C10, and a sixth capacitor C11. The bias sub-circuit consists of a seventh capacitor C12, a fifth resistor R12, and an eighth capacitor C13. The sampled signal first enters a filter sub-circuit composed of the third resistor R10, the fourth resistor R11, the fifth capacitor C10, and the sixth capacitor C11 for filtering. Then it enters a bias sub-circuit composed of the seventh capacitor C12, the fifth resistor R12, and the eighth capacitor C13. Finally, it passes through the sixth resistor R13 to the positive input of the operational amplifier, and the output is fed back to the main control circuit 4.

[0069] Will Figure 7 The analog signal acquisition circuit 9 is equivalent to Figure 8 ,like Figure 8 As shown, the filter circuit is designed with a filter bandwidth of 2MHz; Figure 8 In the middle, voltage It is the common-mode voltage between GND1 and GND2. R is the sampling resistor, and the voltage is... It is the bias voltage, voltage It is the output voltage of the analog signal acquisition.

[0070] Figure 8 In the diagram, the sixth resistor R13 and the eighth resistor R22 have the same resistance value of Ra, the ninth resistor R25 has a resistance value of Rb, the tenth resistor R24 ​​has a resistance value of Rc, and the eleventh resistor R23 has a resistance value of Rd.

[0071] ①

[0072] To eliminate common-mode voltage ,make: ②,

[0073] Right now ,make ,have to: ③,

[0074] Replace 3.3V with Let R, Ra, and Rb be 0.005Ω, 5.1kΩ, and 300Ω respectively. Substituting these values, we get:

[0075] ④

[0076] Among them, the operational amplifier in the analog signal acquisition circuit 9 can be selected as CBM8656AMS8. The core of the analog signal acquisition circuit 9 is to amplify small high-frequency voltage signals, filter out interference signals caused by the switching and resistor parasitic parameters of power devices, cancel the influence of common-mode voltage between power ground and analog ground on the acquisition accuracy, and be able to match the voltage bias of the AD acquisition range.

[0077] In one embodiment, the brushless motor driver circuit system based on the airborne environment further includes: a position information feedback circuit 8, which is connected to the main control circuit 4, the power supply circuit 2, and the motor Hall sensor; the motor Hall sensor is mounted on the brushless motor.

[0078] The position information feedback circuit 8 is used to provide feedback on the position of the brushless motor during its operation.

[0079] Among them, such as Figure 9 As shown, the position information feedback circuit 8 includes: an inverter IC2, wherein the 1Y pin of the inverter IC2 is connected to the 6A pin, the 2Y pin is connected to the 5A pin, and the 3Y pin is connected to the 4A pin; the 1A pin, the 2A pin, and the 3A pin are connected to the motor Hall sensor, and the 4Y pin, the 5Y pin, and the 6Y pin are connected to the main control circuit 4.

[0080] In one embodiment, the brushless motor driver circuit system based on the airborne environment further includes: a communication circuit 7, which is connected to the main control circuit 4 and the host computer; the communication circuit 7 is also connected to the power supply circuit 2.

[0081] Among them, such as Figure 10 As shown, the communication circuit 7 includes: a CAN communication chip; the CANH and CANL pins of the CAN communication chip are both connected to the host computer, and a terminating resistor R118 is connected in parallel between the CAN communication chip and the host computer; a current-limiting resistor R110 is connected between the VCC pin of the CAN communication chip and the power supply pin of the power supply circuit that outputs 5V DC voltage; the TX and RX pins of the CAN communication chip are both connected to the main control circuit 4. The aforementioned terminating resistor R118 is used to stabilize the output signal. The output terminals of the CANH and CANL pins of the CAN communication chip are directly connected to the host computer, which is equivalent to positive and negative input ports. The terminating resistor R118 is connected in parallel between the CAN chip and the host computer. Figure 10 The medium resistor R111 is a reserved port.

[0082] Among them, the CAN communication chip IC103 can be selected as model CA-IF1051VS.

[0083] The instructions from communication circuit 7 are input to the signal communication pin of the main control chip in main control circuit 4 through the communication pin. The main control chip in main control circuit 4 outputs a drive signal to the drive chip in drive circuit 5 through the drive signal output pin for control. The drive chip in drive circuit 5 outputs a signal according to the instructions from main control circuit 4 to the switching pin of the power chip in power circuit 6 for control. The signal is then input to the input pin of the operational amplifier in analog signal acquisition circuit 9 through the sampling resistor of power circuit 6 for signal acquisition. The output pin of the operational amplifier is then connected to the input pin of the main control chip, and the acquired signal is fed back to the main control chip to form a closed loop.

[0084] In one embodiment, the main control chip of the main control circuit 4 can be selected as QJ32F407RGT6. The I / O pins of CANTX, CANRX, RX3 and TX3 defined by the main control chip of the main control circuit 4 are connected to the same defined output pins of the communication circuit 7. The I / O pins of PWM3A and PWM3B defined by the drive signals of the main control chip of the main control circuit 4 are connected to the same defined output pins of the drive chip of the drive circuit 5. The G2 and G5 defined pins of the drive chip are connected to the same defined pins of the field-effect transistor of the power circuit 6. Then the output pin of the analog operational amplifier is connected to the I / O pin of the IFA defined by the main control chip to feed back the collected signal to the main control chip, forming a closed loop.

[0085] The brushless motor driver circuit system based on an airborne environment provided in this application employs a multi-power supply model selection circuit in power circuit 6. By supplying corresponding 28V voltages to the forward, reverse, and emergency power signal terminals, the corresponding motor mode can be selected. A three-phase bridge connection is used, employing three high-precision sampling resistors in the lower bridge arm to acquire the three-phase current and output it to the analog signal acquisition circuit 9. The analog signal acquisition circuit 9, composed of two high-precision operational amplifiers, acquires the three-phase current and power voltage separately, filtering and amplifying small current signals, with the acquisition timing strictly aligned with the MOSFET switching timing of power circuit 6. This method improves the current acquisition accuracy. By dynamically acquiring the changes in three-phase current and power voltage through the analog signal acquisition circuit 9, the high voltage utilization rate of the driver is ensured while improving the current control accuracy under low-voltage conditions.

[0086] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A brushless motor driver circuit system based on an airborne environment, characterized in that, include: The main control circuit (4), drive circuit (5), power circuit (6), analog signal acquisition circuit (9), and multi-source control circuit; One end of the analog signal acquisition circuit (9) is connected to the power circuit (6), and the other end of the analog signal acquisition circuit (9) is connected to the main control circuit (4). The analog signal acquisition circuit (9) is used to acquire the feedback signals of the output current and output voltage of the power circuit (6) and transmit them to the main control circuit (4). The output terminal of the main control circuit (4) is connected to the drive circuit (5), and the main control circuit (4) outputs a control signal to the drive circuit (5) according to the feedback signal; The output terminal of the drive circuit (5) is connected to the power circuit (6), and the drive circuit (5) adjusts the output current and output voltage of the power circuit (6) according to the control signal. The power circuit (6) is connected to the brushless motor, and the power circuit (6) outputs the three-phase current and three-phase voltage adjusted according to the drive circuit (5); The multi-source control circuit supplies power to the main control circuit (4), the drive circuit (5), the power circuit (6), and the analog signal acquisition circuit (9). One end of the multi-source control circuit is connected to the main control circuit (4). The multi-source control circuit sends a power control signal to the main control circuit (4) to enable the main control circuit (4) to select the power mode in order to control the forward rotation, reverse rotation, and emergency response of the brushless motor.

2. The brushless motor driver circuit system based on airborne environment according to claim 1, characterized in that, The multi-source control circuit includes: a power selection mode sub-circuit (1), a power supply circuit (2), and a power signal feedback sub-circuit (3); The input terminal of the power selection mode sub-circuit (1) is connected to the input terminal of the power signal feedback sub-circuit (3) for feeding back the corresponding power signal when there is an input power signal; The output terminal of the power selection mode sub-circuit (1) is connected to the power supply circuit (2) to provide power voltage to the power supply circuit; The output terminal of the power supply circuit provides 15V, 5V and 3.3V voltages. The power supply circuit is connected to the power circuit (6), the drive circuit (5), the main control circuit (4) and the analog signal acquisition circuit (9). The output of the power signal feedback sub-circuit (3) is connected to the main control circuit (4) and is used to step down and filter the high voltage power signal and feed it back to the main control circuit (4) for corresponding mode selection.

3. The brushless motor driver circuit system based on airborne environment according to claim 2, characterized in that, The power selection mode sub-circuit (1) includes: forward buck diode D3, reverse buck diode D6, emergency buck diode D8, constant power supply first buck diode D11 and constant power supply second buck diode D13; The positive terminal of the forward buck diode D3 is connected to the FORWADR power supply signal, the positive terminal of the reverse buck diode D6 is connected to the REVERSE power supply signal, the positive terminal of the emergency buck diode D8 is connected to the EMERGENCY power supply signal for voltage reduction, the positive terminal of the normally powered first buck diode D11 is connected to the normally powered 28V power signal, and the negative terminal of the normally powered first buck diode D11 is connected to the positive terminal of the second buck diode D13; the negative terminals of the forward buck diode D3, the reverse buck diode D6, the emergency buck diode D8, and the second buck diode D13 are connected together and connected to the input terminal of the power supply circuit.

4. The brushless motor driver circuit system based on airborne environment according to claim 2, characterized in that, The power signal feedback sub-circuit (3) includes: One end of the first voltage divider resistor R11 is connected to the power selection mode sub-circuit (1), and the other end of the first voltage divider resistor R1 is connected to a π-type filter composed of a first filter capacitor C14, a second filter capacitor C15 and a filter inductor L3; the rear end of the π-type filter is connected to ground by a second voltage divider resistor R7; an RC filter circuit composed of a filter resistor R6 and a third filter capacitor C13 is connected in parallel across the second voltage divider resistor R7, and the rear end of the RC filter circuit is connected to a protection diode D2 and to the main control circuit (4).

5. The brushless motor driver circuit system based on airborne environment according to claim 2, characterized in that, Also includes: The location information feedback circuit (8) is connected to the main control circuit (4), the power supply circuit (2), and the motor Hall sensor; the motor Hall sensor is installed on the brushless motor. The position information feedback circuit (8) is used to provide feedback on the position of the brushless motor during the operation of the brushless motor.

6. The brushless motor driver circuit system based on airborne environment according to claim 5, characterized in that, The position information feedback circuit (8) includes: inverter IC2, wherein the 1Y pin of inverter IC2 is connected to the 6A pin, the 2Y pin is connected to the 5A pin, and the 3Y pin is connected to the 4A pin; the 1A pin, the 2A pin and the 3A pin are connected to the motor Hall sensor, and the 4Y pin, the 5Y pin and the 6Y pin are connected to the main control circuit (4).

7. The brushless motor driver circuit system based on airborne environment according to claim 2, characterized in that, Also includes: The communication circuit (7) is connected to the main control circuit (4) and the host computer; the communication circuit (7) is also connected to the power supply circuit (2).

8. The brushless motor driver circuit system based on airborne environment according to claim 7, characterized in that, The communication circuit (7) includes: a CAN communication chip; the CANH pin and CANL pin of the CAN communication chip are both connected to the host computer, and a terminating resistor R118 is connected in parallel between the CAN communication chip and the host computer; a current limiting resistor R110 is connected between the VCC pin of the CAN communication chip and the power supply pin of the power supply circuit that outputs 5V DC voltage, and the TX pin and RX pin of the CAN communication chip are both connected to the main control circuit (4).

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