Motor drive circuit, motor drive device and drum control system

Abstract

This application provides a motor drive circuit, a motor drive device, and a roller control system. The motor drive circuit includes a rectifier module, a power module, a drive module, and a control module. The power module is electrically connected to both the rectifier module and the drive module, and the drive module and the control module are electrically connected. The rectifier module converts a received first AC voltage signal into a first DC voltage signal and transmits it to the power module. The control module outputs control commands based on the control signals, the drive module outputs drive signals based on the control commands, and the power module converts the first DC voltage signal into a second AC voltage signal based on the drive signals and transmits it to the motor. In the process of driving the motor, this application eliminates the need for an external industrial power supply to step down the first AC voltage signal to obtain a low-voltage DC voltage, thus eliminating the need for an external power supply module and complex step-down circuitry, significantly reducing the hardware cost of the motor drive circuit.

Description

Technical Field

[0001] This application belongs to the field of roller control systems, and particularly relates to a motor drive circuit, a motor drive device, and a roller control system. Background Technology

[0002] In industrial roller control systems, for single-phase 220V AC power supply scenarios, existing technologies typically employ a traditional low-voltage DC power supply solution. This requires an external voltage conversion module to convert the AC power to low-voltage DC, which is then used to drive the motor via a three-phase inverter circuit. However, this solution necessitates the addition of a voltage conversion module, resulting in higher costs. Utility Model Content

[0003] This application provides a motor drive circuit, a motor drive device, and a roller control system, which can solve the problem that existing motor drive circuit solutions require the addition of a voltage conversion module, resulting in high costs.

[0004] In a first aspect, embodiments of this application provide a motor drive circuit, including a rectifier module, a power module, a drive module, and a control module. The power module is electrically connected to the rectifier module and the drive module, and the drive module is electrically connected to the control module. The power module is used to be electrically connected to a motor, and the control module is used to be electrically connected to a controller.

[0005] The rectifier module is used to convert the received first AC voltage signal into a first DC voltage signal and transmit the first DC voltage signal to the power module; the control module is used to output a control command to the drive module according to the control signal output by the controller; the drive module is used to output a drive signal to the power module according to the control command; the power module is used to convert the first DC voltage signal into a second AC voltage signal according to the drive signal and transmit the second AC voltage signal to the motor.

[0006] In one possible implementation of the first aspect, the rectifier module includes a rectifier bridge, the input of which is used to receive the first AC voltage signal, and the output of which is electrically connected to the power module.

[0007] In one possible implementation of the first aspect, the power module includes a power factor correction unit and an inverter unit, the power factor correction unit being electrically connected to the inverter unit, the drive module and the rectifier module respectively, the inverter unit being electrically connected to the drive module, and the inverter unit being used to be electrically connected to the motor;

[0008] The power factor correction unit is used to perform power factor correction on the first DC voltage signal, and the inverter unit is used to convert the corrected first DC voltage signal into the second AC voltage signal and transmit the second AC voltage signal to the motor.

[0009] In one possible implementation of the first aspect, the motor drive circuit further includes a first acquisition module and a second acquisition module, wherein the first acquisition module is electrically connected to the power module and the drive module respectively, the second acquisition module is electrically connected to the drive module, and the second acquisition module is used to be electrically connected to the motor;

[0010] The first acquisition module is used to acquire bus parameters of the bus in the power module and output bus sampling signals to the drive module; the second acquisition module is used to acquire the state parameters of the motor and output motor state sampling signals to the drive module; the drive module is also used to adjust the drive signal according to the bus sampling signals and the motor state sampling signals.

[0011] In one possible implementation of the first aspect, the bus parameters include bus voltage and bus current, and the first acquisition module includes a bus voltage sampling unit and a bus current sampling unit, wherein the bus voltage sampling unit and the bus current sampling unit are respectively electrically connected to the power module and the drive module;

[0012] The bus voltage sampling unit is used to collect the bus voltage in the power module and output the bus voltage sampling signal to the drive module; the bus current sampling unit is used to collect the bus current in the power module and output the bus current sampling signal to the drive module.

[0013] In one possible implementation of the first aspect, the second acquisition module includes a magnetic encoder unit and an isolation unit, the isolation unit being electrically connected to the magnetic encoder unit and the drive module respectively, and the magnetic encoder unit being used to be electrically connected to the motor;

[0014] The magnetic encoder unit is used to collect the state parameters of the motor and output the magnetic encoder signal to the isolation unit; the isolation unit is used to output the motor state sampling signal to the drive module according to the magnetic encoder signal.

[0015] In one possible implementation of the first aspect, the motor drive circuit further includes a third acquisition module, which is electrically connected to the drive module; the third acquisition module is used to acquire the temperature inside the motor and output a temperature sampling signal to the drive module.

[0016] In one possible implementation of the first aspect, the motor drive circuit further includes a protection module electrically connected to the rectifier module; the protection module is used to filter out harmonic signals in the first AC voltage signal and suppress surge energy input to the rectifier module.

[0017] Secondly, embodiments of this application provide a motor drive device, including the motor drive circuit described in any one of the first aspects.

[0018] Thirdly, embodiments of this application provide a roller control system, including a controller, a motor, and the motor drive device described in the second aspect, wherein the motor drive device is electrically connected to the controller and the motor respectively.

[0019] The beneficial effects of the embodiments in this application compared with the prior art are:

[0020] The motor drive circuit provided in this application includes a rectifier module, a power module, a drive module, and a control module. In practical applications, the user outputs a control signal to the control module through a controller, and the control module further sends control commands to the drive module to drive the motor. During the motor drive process, the rectifier module receives a first AC voltage signal, rectifies it to generate a first DC voltage signal, and transmits it to the power module. The power module can convert the first DC voltage signal into a second AC voltage signal according to the drive signal. The second AC voltage signal is the three-phase AC voltage signal required to drive the motor. Therefore, the motor drive circuit in this application does not require additional voltage conversion to step down the first AC voltage signal to obtain a low-voltage DC voltage during the motor drive process. Instead, it directly outputs the second AC voltage signal to drive the motor through rectification and power conversion, eliminating the need for an external power supply module and complex step-down stage, thereby significantly reducing the hardware cost of the motor drive circuit. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application, 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.

[0022] Figure 1 This is a schematic block diagram of a motor drive circuit provided in one embodiment of this application;

[0023] Figure 2 This is a schematic block diagram of a motor drive circuit provided in another embodiment of this application;

[0024] Figure 3This is a circuit connection diagram of a power module provided in an embodiment of this application;

[0025] Figure 4 This is a schematic block diagram of a motor drive circuit provided in another embodiment of this application;

[0026] Figure 5 This is a circuit connection diagram of the first acquisition module provided in an embodiment of this application;

[0027] Figure 6 This is a circuit connection diagram of an isolation unit provided in an embodiment of this application;

[0028] Figure 7 This is a schematic block diagram of a motor drive circuit provided in another embodiment of this application;

[0029] Figure 8 This is a schematic diagram of the overall functional connection of a roller control system provided in an embodiment of this application.

[0030] In the diagram: 10, motor drive circuit; 101, rectifier module; 102, power module; 103, drive module; 104, control module; 105, first acquisition module; 106, second acquisition module; 1061, magnetic encoder unit; 1062, isolation unit; 107, third acquisition module; 108, protection module; 20, motor; 30, controller. Detailed Implementation

[0031] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0032] It should be understood that, when used in this application specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or a collection thereof.

[0033] As used in this application specification and the appended claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if [the described condition or event] is detected" may be interpreted, depending on the context, as "once determined," "in response to determination," "once [the described condition or event] is detected," or "in response to detection of [the described condition or event]."

[0034] Furthermore, in the description of this application and the appended claims, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0035] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0036] In industrial roller control systems, for single-phase 220V AC power supply scenarios, existing technologies typically employ traditional low-voltage DC power supply solutions. This requires an external voltage converter to convert the AC power to low-voltage DC before driving the motor via a three-phase inverter circuit. However, this solution necessitates the addition of a voltage conversion module, resulting in higher costs.

[0037] For example, the voltage conversion module can be an AC-DC industrial power supply. Traditional solutions typically step down single-phase 220V AC to 48V DC, and then convert it back to 48V AC to drive the motor. Specifically, the AC-DC industrial power supply first converts the 220V AC to 48V DC through rectification, filtering, and step-down operations. Then, a three-phase full-bridge inverter circuit composed of power switching devices is used. With the 48V DC as input, the control circuit generates three signals with a 120° phase difference to drive the switching transistors to turn on and off alternately. By adjusting the duty cycle of the signals, the 48V DC is inverted into 48V three-phase AC to drive the motor.

[0038] Based on the above problems, the motor drive circuit provided in this application includes a rectifier module, a power module, a drive module, and a control module. In practical applications, the user outputs a control signal to the control module through a controller, and the control module further sends control commands to the drive module to drive the motor. During the motor drive process, the rectifier module receives a first AC voltage signal, rectifies it to generate a first DC voltage signal, and transmits it to the power module. The power module can convert the first DC voltage signal into a second AC voltage signal according to the drive signal. The second AC voltage signal is the three-phase AC voltage signal required to drive the motor. Therefore, the motor drive circuit in this application does not require additional voltage conversion to step down the first AC voltage signal to obtain a low-voltage DC voltage during the motor drive process. Instead, it directly outputs the second AC voltage signal to drive the motor through rectification and power conversion, eliminating the need for an external power supply module and complex step-down stage, thereby significantly reducing the hardware cost of the motor drive circuit.

[0039] To illustrate the technical solution described in this application, specific embodiments are provided below.

[0040] Figure 1 A schematic block diagram of a motor drive circuit 10 according to an embodiment of this application is shown. See also... Figure 1 As shown, the motor drive circuit 10 is applied to the roller control system. The motor drive circuit 10 includes a rectifier module 101, a power module 102, a drive module 103, and a control module 104. The power module 102 is electrically connected to the rectifier module 101 and the drive module 103, respectively. The drive module 103 is electrically connected to the control module 104. The power module 102 is used to be electrically connected to the motor 20, and the control module 104 is used to be electrically connected to the controller 30.

[0041] Specifically, in practical applications, the user outputs control signals to the control module 104 via the controller 30. The control module 104 then sends control commands to the drive module 103 to drive the motor 20. During the driving of the motor 20, the rectifier module 101 receives the first AC voltage signal, rectifies it to generate a first DC voltage signal, and transmits it to the power module 102. The power module 102 can convert the first DC voltage signal into a second AC voltage signal according to the drive signal. The second AC voltage signal is the three-phase AC voltage signal required to drive the motor 20. Therefore, the motor drive circuit 10 in this application does not require additional voltage conversion to step down the first AC voltage signal to obtain a low-voltage DC voltage during the driving of the motor 20. Instead, it directly outputs the second AC voltage signal to drive the motor 20 through rectification and power conversion, eliminating the need for an external power supply module and complex step-down circuit, thereby significantly reducing the hardware cost of the motor drive circuit 10.

[0042] It should be noted that the first AC voltage signal can be single-phase AC220V. The motor drive circuit 10 in this application can directly rectify and invert the single-phase AC220V to obtain the three-phase AC voltage signal required to drive the motor 20, without the need for additional voltage conversion. This avoids the complex process of stepping AC to low-voltage DC and then converting it to the voltage required to drive the motor 20 in traditional solutions, significantly reducing the cost of the motor drive circuit 10 and reducing energy conversion losses, resulting in higher efficiency. In addition, the voltage converters configured in existing solutions are bulky, which may lead to complex wiring, large space occupation, difficulty in adapting to compact equipment, and increased difficulty in later maintenance. The solution in this application does not require external voltage conversion, effectively improving system integration.

[0043] For example, the motor 20 in this application is a high-voltage brushless motor 20 with an effective power of 750W.

[0044] In one embodiment of this application, the rectifier module 101 includes a rectifier bridge, the input terminal of which is used to receive a first AC voltage signal, and the output terminal of which is electrically connected to the power module 102.

[0045] Specifically, the input single-phase AC220V alternating current is converted into pulsating direct current (first DC voltage signal) to provide the basic DC voltage for the voltage conversion stage of the subsequent power module 102. A full-bridge or half-bridge structure can be used; the following example uses a full-bridge structure. The positive and negative half-cycles of the first AC voltage signal are converted into a unidirectional pulsating DC voltage (theoretically approximately 1.414 times AC220V, or approximately 310VDC) through a full-bridge structure composed of four diodes inside the rectifier bridge, providing the DC input to the power module 102.

[0046] In one embodiment of this application, such as Figure 2 As shown, the power module 102 includes a power factor correction unit and an inverter unit. The power factor correction unit is electrically connected to the inverter unit, the drive module 103 and the rectifier module 101, respectively. The inverter unit is electrically connected to the drive module 103 and is used to electrically connect to the motor 20.

[0047] Specifically, the power factor correction unit corrects the power factor of the first DC voltage signal (pulsating DC power generated by the rectifier bridge) output by the rectifier module 101, boosts and stabilizes the bus voltage (e.g., to 360-400VDC) through circuits such as Boost converter, optimizes the input current waveform to improve the power factor (e.g., PF (Power Factor) ≥ 0.95), and receives control signals (e.g., PWM (Pulse Width Modulation) signals) from the drive module 103 to achieve closed-loop regulation. The inverter unit converts the power factor-corrected first DC voltage signal into a second AC voltage signal (e.g., three-phase AC power) with adjustable frequency and amplitude, and transmits it to the motor 20 to drive its operation. It also precisely adjusts the frequency and phase of the output voltage through control commands input from the drive module 103, achieving dynamic control of parameters such as the motor 20's speed and torque. Therefore, the motor drive circuit 10 of this application, equipped with a power factor correction unit, can improve the power factor and enhance the reliability of the motor 20 drive.

[0048] It should be noted that the power factor correction unit and the inverter unit can be integrated into a single design, such as... Figure 3 As shown, the inverter unit corresponds to Figure 3 The power module 102 includes IGBT devices such as QUH, QVH, QWH, QUL, QVL, and QWL, and output interfaces U+, V+, W+, U-, V-, and W-. The power factor correction unit achieves power factor correction through PFC-CTL control signals, PFCIN voltage sampling, and I_IPM_IN current sampling. Furthermore, the power module 102 also includes an overcurrent protection unit. Figure 3 R249 and C166 connected to the ITRIP pin constitute a threshold setting circuit, which triggers overcurrent protection when ITRIP is 0.5V 30A. Figure 3 Pins 13, 9, and 5 are used as the three output pins of the power module 102 to connect to the three-phase motor 20. Figure 3 The other interfaces, devices, and pins are all conventional designs and belong to existing technology, so they will not be described in detail here.

[0049] In one embodiment of this application, such as Figure 4 As shown, the motor drive circuit 10 also includes a first acquisition module 105 and a second acquisition module 106. The first acquisition module 105 is electrically connected to the power module 102 and the drive module 103 respectively, and the second acquisition module 106 is electrically connected to the drive module 103. The second acquisition module 106 is disposed inside the motor 20 and is used to be electrically connected to the motor 20.

[0050] Specifically, the power module 102 is equipped with a bus and a bus capacitor. The first acquisition module 105 can acquire the bus parameters of the bus in the power module 102 through the bus capacitor and output the bus sampling signal to the drive module 103. The second acquisition module 106 can acquire the status parameters of the motor 20 and output the status sampling signal of the motor 20 to the drive module 103. The drive module 103 receives and processes the bus sampling signal from the first acquisition module 105 and the status sampling signal of the motor 20 from the second acquisition module 106. By adjusting the drive signal output to the power module 102 (such as PWM pulse width, frequency, phase, etc.), it dynamically adjusts the inverter output of the power module 102 (such as the frequency and amplitude of the three-phase AC power transmitted to the motor 20), thereby achieving precise modulation of the speed and torque of the motor 20. At the same time, it triggers protection mechanisms such as overvoltage, overcurrent, and overtemperature to ensure the stability and accuracy of the motor 20's operation.

[0051] It should be noted that, since the second acquisition module 106 needs to collect the status parameters of the motor 20, it is located inside the motor 20. The second acquisition module 106 is directly connected to the windings and sensor interface of the motor 20 via wires or PCB (Printed Circuit Board) traces, thus achieving an electrical connection with the motor 20. The second acquisition module 106 can also be integrated with the mechanical structures of the motor 20, such as the shaft and end cover, through a fixed bracket or integrated package, thus achieving a mechanical connection with the motor 20. This coordinated design of electrical and mechanical connections enables the second acquisition module 106 to directly and reliably acquire key status parameters such as the rotor position, speed, and temperature of the motor 20, and to achieve dynamic control and safety protection of the motor 20's operating status through the drive module 103.

[0052] It should be noted that bus parameters include bus voltage and bus current, and bus sampling signals include bus voltage sampling signals and bus current sampling signals. For example... Figure 5 As shown, the first acquisition module 105 includes a bus voltage sampling unit and a bus current sampling unit, both of which are electrically connected to the power module 102 and the drive module 103, respectively.

[0053] Specifically, the bus voltage sampling unit is used to acquire the bus voltage in the power module 102 and output the bus voltage sampling signal to the drive module 103. More specifically, the bus voltage sampling unit uses a bus capacitor or resistor voltage divider network (such as...) within the power module 102... Figure 5The bus voltage is collected by resistors R293, R294, R295, R296, and R297, etc., and converted into an analog signal (such as a 0-5V voltage signal) recognizable by the drive module 103. The bus voltage sampling signal is then output to the drive module 103 to monitor whether the bus voltage is stable within the target range (such as 360-400VDC), providing data support for the voltage closed-loop control of the power factor correction stage. The bus current sampling unit is used to collect the bus current in the power module 102 and output a bus current sampling signal to the drive module 103. Specifically, the bus current sampling unit uses shunt resistors (such as...) to collect the bus current in the power module 102 and outputs a bus current sampling signal to the drive module 103. Figure 5 The bus current is collected by resistors R304, R306, and R307 or a Hall sensor, and then a differential amplifier circuit (such as...) is used to amplify the current. Figure 5 The bus voltage sampling unit and the bus current sampling unit (TS41 and TS44 signal interfaces) process the signal and output the bus current sampling signal, which is used to monitor the operating current of the power module 102 in real time. This provides a basis for the drive module 103 to determine the load status of the motor 20 and trigger overcurrent protection. The two units, the bus voltage sampling unit and the bus current sampling unit, work together to ensure that the drive module 103 can dynamically adjust the drive signal of the power module 102 according to the bus sampling signal, so as to realize the stable operation and safety protection of the motor 20 drive system.

[0054] In one embodiment of this application, the second acquisition module 106 includes a magnetic encoder unit 1061 and an isolation unit 1062. The isolation unit 1062 is electrically connected to the magnetic encoder unit 1061 and the drive module 103, respectively. The magnetic encoder unit 1061 is used to be electrically connected to the motor 20.

[0055] Specifically, the magnetic encoder unit 1061 is used to collect the state parameters (rotor position, speed, etc.) of the motor 20 and output magnetic encoder signals to the isolation unit 1062. The isolation unit 1062 processes the magnetic encoder signals through magnetic isolation or signal isolation technology and converts them into motor 20 state sampling signals (such as digital signals in SSI (Synchronous Serial Interface) mode) that can be recognized by the drive module 103. At the same time, it suppresses electromagnetic interference generated during the operation of the motor 20, ensures the stability and reliability of signal transmission, and enables the drive module 103 to achieve precise control of the motor 20 based on accurate motor 20 state data.

[0056] It should be noted that a receiver (such as an RS (Recommended Standard) 422 receiver) can also be provided between the magnetic encoder unit 1061 and the isolation unit 1062 to convert the single-ended signal of the magnetic encoder into a differential signal for transmission, thereby enhancing anti-interference capability. Figure 6As shown, the isolation unit 1062 adopts a differential-to-single-ended isolation method to isolate and convert the magnetic encoder signal, ensuring the stability and reliability of signal transmission. Figure 6 The circuit diagram of the isolation unit 1062 shown includes conventional designs such as chips, resistors, and capacitors, which are existing technologies and will not be described in detail here.

[0057] In one embodiment of this application, such as Figure 7 As shown, the motor drive circuit 10 also includes a third acquisition module 107, which is electrically connected to the drive module 103. The third acquisition module 107 is installed inside the motor 20 and is used to acquire the temperature inside the motor 20 and output a temperature sampling signal to the drive module 103.

[0058] Specifically, the third acquisition module 107 converts the acquired temperature into a temperature sampling signal and transmits it to the drive module 103. The drive module 103 then performs subsequent adjustments and control based on the temperature sampling signal. Specifically, when the drive module 103 detects that the motor 20 temperature exceeds a preset threshold (e.g., 120°C) based on the temperature sampling signal, it triggers a shutdown or frequency reduction protection to prevent winding insulation aging or permanent magnet demagnetization. Furthermore, the drive module 103 can dynamically adjust the fan speed or the switching frequency of the power module 102 based on the temperature data to optimize the heat dissipation efficiency of the motor 20. Simultaneously, it provides temperature feedback to the drive module 103 to support health status diagnosis of the motor 20 (e.g., bearing wear, cooling system fault warnings).

[0059] It should be noted that the third acquisition module 107 includes a temperature sensor, which can detect the internal temperature of the motor 20 and output a temperature sampling signal to the drive module 103. If the drive module 103 detects that the temperature of the motor 20 exceeds the preset temperature, it can output an alarm signal.

[0060] In one embodiment of this application, such as Figure 7 As shown, the motor drive circuit 10 also includes a protection module 108, which is electrically connected to the rectifier module 101. The protection module 108 is used to filter out harmonic signals in the first AC voltage signal and suppress surge energy input to the rectifier module 101.

[0061] Specifically, the protection module 108 is electrically connected to the rectifier module 101 and connected in series in the input path of the first AC voltage signal (such as single-phase AC220V). It mainly includes a fuse, an EMI (Electromagnetic Interference) filter circuit, a surge protection circuit, a relay, and a PTC (Positive Temperature Coefficient Thermistor) resistor. Its main functions include: (1) High-frequency interference filtering: suppressing high-frequency noise (such as switching power supply harmonics and external electromagnetic interference) in the power input through the EMI filter circuit (such as a common-mode inductor), reducing interference to the subsequent circuits, and improving the system's electromagnetic compatibility. (2) Surge energy suppression: limiting the surge current input to the rectifier module 101 at the moment of power-on through the surge protection circuit (such as a PTC (Positive Temperature Coefficient) thermistor and a varistor), avoiding damage to the rectifier bridge, bus capacitors and other components by the surge current, and extending the circuit life. (3) Overcurrent protection is pre-installed: an integrated fuse element is used to quickly melt and cut off the power supply circuit when an abnormality such as a short circuit occurs on the power input side, preventing the fault from spreading to the power module 102 and the motor 20.

[0062] In one embodiment of this application, such as Figure 8As shown, the drive module 103 includes an MCU (Microcontroller Unit) 1, which outputs drive signals to the power module 102 according to control commands, and also adjusts the drive signals according to the bus sampling signal and the motor 20 status sampling signal. The motor drive circuit 10 also includes a storage module for storing motor 20 parameters and control parameters for later use. The motor drive circuit 10 also includes a discharge driver and an external braking resistor to release the problem of bus voltage surge. The motor drive circuit 10 also includes a USART (Universal Synchronous / Asynchronous Receiver / Transmitter) isolation for communication with the control board, and the signal isolation avoids contact with high voltage. The motor drive circuit 10 also includes a first LDO (Low Dropout Regulator) power supply (output VCC15V and VCC5V), a second LDO power supply (output VDD12V and VDD5V), an isolated 5V power supply, and a flyback power supply. The flyback power supply generates two isolated power supplies (a first LDO power supply and a second LDO power supply) to power the subsequent stages. The VCC15V output from the first LDO power supply provides a stable 15V voltage to the power module 102, and the VCC5V output from the first LDO power supply provides a stable 5V voltage to the MCU1. The VDD12V output from the second LDO power supply is transmitted to the differential SSI, and the VDD5V output from the second LDO power supply is transmitted to the isolated 5V power supply. The isolated 5V power supply is used to isolate the signal and transmit VDD5V to the control board. The signal transmission between modules and the signal transmission direction can be found in [reference needed]. Figure 8 As shown, I will not go into too much detail here.

[0063] It should be noted that, as Figure 8 As shown, the protection module 108, rectifier module 101, power module 102, drive module 103, first acquisition module 105, isolation unit 1062, differential SSI, storage module, bleeder driver, USART isolation, first LDO power supply, second LDO power supply, isolated 5V power supply and flyback power supply are all mounted on the drive board.

[0064] In one embodiment of this application, such as Figure 8As shown, the control module 104 includes MCU2, which outputs control commands to MCU1 via USART isolation based on the control signals output by the PLC (Programmable Logic Controller, controller 30), thereby driving the motor 20. The motor drive circuit 10 also includes 485 communication for information exchange with the PLC. The motor drive circuit 10 also includes a PLC signal input isolation optocoupler for isolating and transmitting the control signals output by the PLC to MCU2. The motor drive circuit 10 also includes an ADC (Analog-to-Digital Converter) sampling unit (0-10V) for receiving analog signals from the PLC to control the speed of the motor 20. The motor drive circuit 10 also includes a third LDO power supply (output VPP 3.3V) for providing a stable 3.3V voltage to MCU2. The motor drive circuit 10 also includes function switches (8-bit DIP switch + 4-bit DIP switch + 4-bit DIP switch) for controlling the speed, acceleration, and other setting functions of the motor 20. The transmission signals and signal transmission directions between modules can be found in [reference needed]. Figure 8 As shown, I will not go into too much detail here.

[0065] It should be noted that, as Figure 8 As shown, the control module 104, 485 communication, PLC signal input isolation optocoupler, ADC sampling, third LDO power supply and function switch are all located on the control board.

[0066] In one embodiment of this application, such as Figure 8 As shown, the motor drive circuit 10 also includes a fourth LDO power supply (output VDD 3.3V) to provide a stable 3.3V voltage for the SSI mode magnetic encoder. The motor drive circuit 10 also includes an RS422 receiver to convert the single-ended signal of the SSI mode magnetic encoder into a differential signal for transmission to enhance anti-interference capability.

[0067] It should be noted that, as Figure 8 As shown, the magnetic encoder unit 1061, the third acquisition module 107, the fourth LDO power supply and the RS422 receiver are all set on the magnetic encoder plate and are located inside the motor 20.

[0068] This application also discloses a motor 20 drive device, including the aforementioned motor drive circuit 10. Using the aforementioned motor drive circuit 10, the overall system size can be further reduced, adapting to the integration requirements of compact industrial equipment. Simultaneously, it reduces energy conversion losses and improves electrical energy efficiency, making it particularly suitable for applications with high requirements for cost control and energy efficiency, such as industrial automation and logistics transportation.

[0069] This application also discloses a roller control system, including a controller, a motor, and the aforementioned motor drive device, wherein the motor drive device is electrically connected to both the controller and the motor. The roller control system can achieve precise control of the motor through the motor drive device, and simultaneously provides multiple protection functions such as overvoltage, overcurrent, and overheat protection, significantly improving the stability and reliability of the roller control system.

[0070] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. An electric motor drive circuit, characterized by, It includes a rectifier module, a power module, a drive module, and a control module. The power module is electrically connected to the rectifier module and the drive module, and the drive module is electrically connected to the control module. The power module is used to be electrically connected to a motor, and the control module is used to be electrically connected to a controller. The rectifier module is used to convert the received first AC voltage signal into a first DC voltage signal and transmit the first DC voltage signal to the power module; the control module is used to output a control command to the drive module according to the control signal output by the controller; the drive module is used to output a drive signal to the power module according to the control command; the power module is used to convert the first DC voltage signal into a second AC voltage signal according to the drive signal and transmit the second AC voltage signal to the motor.

2. The motor drive circuit of claim 1, wherein, The rectifier module includes a rectifier bridge, the input terminal of which is used to receive the first AC voltage signal, and the output terminal of which is electrically connected to the power module.

3. The motor drive circuit of claim 1, wherein, The power module includes a power factor correction unit and an inverter unit. The power factor correction unit is electrically connected to the inverter unit, the drive module, and the rectifier module, respectively. The inverter unit is electrically connected to the drive module and is used to electrically connect to the motor. The power factor correction unit is used to perform power factor correction on the first DC voltage signal, and the inverter unit is used to convert the corrected first DC voltage signal into the second AC voltage signal and transmit the second AC voltage signal to the motor.

4. The motor drive circuit according to any one of claims 1 to 3, characterized by, The motor drive circuit further includes a first acquisition module and a second acquisition module. The first acquisition module is electrically connected to the power module and the drive module, respectively. The second acquisition module is electrically connected to the drive module and is used to electrically connect to the motor. The first acquisition module is used to acquire bus parameters of the bus in the power module and output bus sampling signals to the drive module; the second acquisition module is used to acquire the state parameters of the motor and output motor state sampling signals to the drive module; the drive module is also used to adjust the drive signal according to the bus sampling signals and the motor state sampling signals.

5. The motor drive circuit of claim 4, wherein, The bus parameters include bus voltage and bus current. The first acquisition module includes a bus voltage sampling unit and a bus current sampling unit. The bus voltage sampling unit and the bus current sampling unit are respectively electrically connected to the power module and the drive module. The bus voltage sampling unit is used to collect the bus voltage in the power module and output the bus voltage sampling signal to the drive module; the bus current sampling unit is used to collect the bus current in the power module and output the bus current sampling signal to the drive module.

6. The motor drive circuit of claim 4, wherein, The second acquisition module includes a magnetic encoder unit and an isolation unit. The isolation unit is electrically connected to the magnetic encoder unit and the drive module, respectively. The magnetic encoder unit is used to be electrically connected to the motor. The magnetic encoder unit is configured to collect a state parameter of the motor and output a magnetic encoding signal to the isolation unit; and the isolation unit is configured to output the motor state sampling signal to the driving module according to the magnetic encoding signal.

7. The motor drive circuit according to any one of claims 1 to 3, characterized by The motor driving circuit further comprises a third acquisition module electrically connected to the driving module; the third acquisition module is configured to collect a temperature inside the motor and output a temperature sampling signal to the driving module.

8. The motor drive circuit according to any one of claims 1 to 3, characterized by, The motor driving circuit further comprises a protection module electrically connected to the rectifying module; the protection module is configured to filter out harmonic signals in the first alternating voltage signal and suppress surge energy input to the rectifying module.

9. An electric motor drive apparatus, characterized by comprising: The motor driving circuit according to any one of claims 1-8.

10. A drum control system characterized by, The motor driving device according to claim 9, wherein the motor driving device is electrically connected to the controller and the motor, respectively.

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